--- /dev/null
+/* png.h - header file for PNG reference library\r
+ *\r
+ * libpng version 1.2.33 - October 31, 2008\r
+ * Copyright (c) 1998-2008 Glenn Randers-Pehrson\r
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)\r
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)\r
+ *\r
+ * Authors and maintainers:\r
+ * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat\r
+ * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger\r
+ * libpng versions 0.97, January 1998, through 1.2.33 - October 31, 2008: Glenn\r
+ * See also "Contributing Authors", below.\r
+ *\r
+ * Note about libpng version numbers:\r
+ *\r
+ * Due to various miscommunications, unforeseen code incompatibilities\r
+ * and occasional factors outside the authors' control, version numbering\r
+ * on the library has not always been consistent and straightforward.\r
+ * The following table summarizes matters since version 0.89c, which was\r
+ * the first widely used release:\r
+ *\r
+ * source png.h png.h shared-lib\r
+ * version string int version\r
+ * ------- ------ ----- ----------\r
+ * 0.89c "1.0 beta 3" 0.89 89 1.0.89\r
+ * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90]\r
+ * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95]\r
+ * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96]\r
+ * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97]\r
+ * 0.97c 0.97 97 2.0.97\r
+ * 0.98 0.98 98 2.0.98\r
+ * 0.99 0.99 98 2.0.99\r
+ * 0.99a-m 0.99 99 2.0.99\r
+ * 1.00 1.00 100 2.1.0 [100 should be 10000]\r
+ * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000]\r
+ * 1.0.1 png.h string is 10001 2.1.0\r
+ * 1.0.1a-e identical to the 10002 from here on, the shared library\r
+ * 1.0.2 source version) 10002 is 2.V where V is the source code\r
+ * 1.0.2a-b 10003 version, except as noted.\r
+ * 1.0.3 10003\r
+ * 1.0.3a-d 10004\r
+ * 1.0.4 10004\r
+ * 1.0.4a-f 10005\r
+ * 1.0.5 (+ 2 patches) 10005\r
+ * 1.0.5a-d 10006\r
+ * 1.0.5e-r 10100 (not source compatible)\r
+ * 1.0.5s-v 10006 (not binary compatible)\r
+ * 1.0.6 (+ 3 patches) 10006 (still binary incompatible)\r
+ * 1.0.6d-f 10007 (still binary incompatible)\r
+ * 1.0.6g 10007\r
+ * 1.0.6h 10007 10.6h (testing xy.z so-numbering)\r
+ * 1.0.6i 10007 10.6i\r
+ * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0)\r
+ * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible)\r
+ * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible)\r
+ * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)\r
+ * 1.0.7 1 10007 (still compatible)\r
+ * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4\r
+ * 1.0.8rc1 1 10008 2.1.0.8rc1\r
+ * 1.0.8 1 10008 2.1.0.8\r
+ * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6\r
+ * 1.0.9rc1 1 10009 2.1.0.9rc1\r
+ * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10\r
+ * 1.0.9rc2 1 10009 2.1.0.9rc2\r
+ * 1.0.9 1 10009 2.1.0.9\r
+ * 1.0.10beta1 1 10010 2.1.0.10beta1\r
+ * 1.0.10rc1 1 10010 2.1.0.10rc1\r
+ * 1.0.10 1 10010 2.1.0.10\r
+ * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3\r
+ * 1.0.11rc1 1 10011 2.1.0.11rc1\r
+ * 1.0.11 1 10011 2.1.0.11\r
+ * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2\r
+ * 1.0.12rc1 2 10012 2.1.0.12rc1\r
+ * 1.0.12 2 10012 2.1.0.12\r
+ * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned)\r
+ * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2\r
+ * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5\r
+ * 1.2.0rc1 3 10200 3.1.2.0rc1\r
+ * 1.2.0 3 10200 3.1.2.0\r
+ * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4\r
+ * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2\r
+ * 1.2.1 3 10201 3.1.2.1\r
+ * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6\r
+ * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1\r
+ * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1\r
+ * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1\r
+ * 1.0.13 10 10013 10.so.0.1.0.13\r
+ * 1.2.2 12 10202 12.so.0.1.2.2\r
+ * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6\r
+ * 1.2.3 12 10203 12.so.0.1.2.3\r
+ * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3\r
+ * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1\r
+ * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1\r
+ * 1.0.14 10 10014 10.so.0.1.0.14\r
+ * 1.2.4 13 10204 12.so.0.1.2.4\r
+ * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2\r
+ * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3\r
+ * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3\r
+ * 1.0.15 10 10015 10.so.0.1.0.15\r
+ * 1.2.5 13 10205 12.so.0.1.2.5\r
+ * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4\r
+ * 1.0.16 10 10016 10.so.0.1.0.16\r
+ * 1.2.6 13 10206 12.so.0.1.2.6\r
+ * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2\r
+ * 1.0.17rc1 10 10017 10.so.0.1.0.17rc1\r
+ * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1\r
+ * 1.0.17 10 10017 10.so.0.1.0.17\r
+ * 1.2.7 13 10207 12.so.0.1.2.7\r
+ * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5\r
+ * 1.0.18rc1-5 10 10018 10.so.0.1.0.18rc1-5\r
+ * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5\r
+ * 1.0.18 10 10018 10.so.0.1.0.18\r
+ * 1.2.8 13 10208 12.so.0.1.2.8\r
+ * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3\r
+ * 1.2.9beta4-11 13 10209 12.so.0.9[.0]\r
+ * 1.2.9rc1 13 10209 12.so.0.9[.0]\r
+ * 1.2.9 13 10209 12.so.0.9[.0]\r
+ * 1.2.10beta1-8 13 10210 12.so.0.10[.0]\r
+ * 1.2.10rc1-3 13 10210 12.so.0.10[.0]\r
+ * 1.2.10 13 10210 12.so.0.10[.0]\r
+ * 1.2.11beta1-4 13 10211 12.so.0.11[.0]\r
+ * 1.0.19rc1-5 10 10019 10.so.0.19[.0]\r
+ * 1.2.11rc1-5 13 10211 12.so.0.11[.0]\r
+ * 1.0.19 10 10019 10.so.0.19[.0]\r
+ * 1.2.11 13 10211 12.so.0.11[.0]\r
+ * 1.0.20 10 10020 10.so.0.20[.0]\r
+ * 1.2.12 13 10212 12.so.0.12[.0]\r
+ * 1.2.13beta1 13 10213 12.so.0.13[.0]\r
+ * 1.0.21 10 10021 10.so.0.21[.0]\r
+ * 1.2.13 13 10213 12.so.0.13[.0]\r
+ * 1.2.14beta1-2 13 10214 12.so.0.14[.0]\r
+ * 1.0.22rc1 10 10022 10.so.0.22[.0]\r
+ * 1.2.14rc1 13 10214 12.so.0.14[.0]\r
+ * 1.0.22 10 10022 10.so.0.22[.0]\r
+ * 1.2.14 13 10214 12.so.0.14[.0]\r
+ * 1.2.15beta1-6 13 10215 12.so.0.15[.0]\r
+ * 1.0.23rc1-5 10 10023 10.so.0.23[.0]\r
+ * 1.2.15rc1-5 13 10215 12.so.0.15[.0]\r
+ * 1.0.23 10 10023 10.so.0.23[.0]\r
+ * 1.2.15 13 10215 12.so.0.15[.0]\r
+ * 1.2.16beta1-2 13 10216 12.so.0.16[.0]\r
+ * 1.2.16rc1 13 10216 12.so.0.16[.0]\r
+ * 1.0.24 10 10024 10.so.0.24[.0]\r
+ * 1.2.16 13 10216 12.so.0.16[.0]\r
+ * 1.2.17beta1-2 13 10217 12.so.0.17[.0]\r
+ * 1.0.25rc1 10 10025 10.so.0.25[.0]\r
+ * 1.2.17rc1-3 13 10217 12.so.0.17[.0]\r
+ * 1.0.25 10 10025 10.so.0.25[.0]\r
+ * 1.2.17 13 10217 12.so.0.17[.0]\r
+ * 1.0.26 10 10026 10.so.0.26[.0]\r
+ * 1.2.18 13 10218 12.so.0.18[.0]\r
+ * 1.2.19beta1-31 13 10219 12.so.0.19[.0]\r
+ * 1.0.27rc1-6 10 10027 10.so.0.27[.0]\r
+ * 1.2.19rc1-6 13 10219 12.so.0.19[.0]\r
+ * 1.0.27 10 10027 10.so.0.27[.0]\r
+ * 1.2.19 13 10219 12.so.0.19[.0]\r
+ * 1.2.20beta01-04 13 10220 12.so.0.20[.0]\r
+ * 1.0.28rc1-6 10 10028 10.so.0.28[.0]\r
+ * 1.2.20rc1-6 13 10220 12.so.0.20[.0]\r
+ * 1.0.28 10 10028 10.so.0.28[.0]\r
+ * 1.2.20 13 10220 12.so.0.20[.0]\r
+ * 1.2.21beta1-2 13 10221 12.so.0.21[.0]\r
+ * 1.2.21rc1-3 13 10221 12.so.0.21[.0]\r
+ * 1.0.29 10 10029 10.so.0.29[.0]\r
+ * 1.2.21 13 10221 12.so.0.21[.0]\r
+ * 1.2.22beta1-4 13 10222 12.so.0.22[.0]\r
+ * 1.0.30rc1 10 10030 10.so.0.30[.0]\r
+ * 1.2.22rc1 13 10222 12.so.0.22[.0]\r
+ * 1.0.30 10 10030 10.so.0.30[.0]\r
+ * 1.2.22 13 10222 12.so.0.22[.0]\r
+ * 1.2.23beta01-05 13 10223 12.so.0.23[.0]\r
+ * 1.2.23rc01 13 10223 12.so.0.23[.0]\r
+ * 1.2.23 13 10223 12.so.0.23[.0]\r
+ * 1.2.24beta01-02 13 10224 12.so.0.24[.0]\r
+ * 1.2.24rc01 13 10224 12.so.0.24[.0]\r
+ * 1.2.24 13 10224 12.so.0.24[.0]\r
+ * 1.2.25beta01-06 13 10225 12.so.0.25[.0]\r
+ * 1.2.25rc01-02 13 10225 12.so.0.25[.0]\r
+ * 1.0.31 10 10031 10.so.0.31[.0]\r
+ * 1.2.25 13 10225 12.so.0.25[.0]\r
+ * 1.2.26beta01-06 13 10226 12.so.0.26[.0]\r
+ * 1.2.26rc01 13 10226 12.so.0.26[.0]\r
+ * 1.2.26 13 10226 12.so.0.26[.0]\r
+ * 1.0.32 10 10032 10.so.0.32[.0]\r
+ * 1.2.27beta01-06 13 10227 12.so.0.27[.0]\r
+ * 1.2.27rc01 13 10227 12.so.0.27[.0]\r
+ * 1.0.33 10 10033 10.so.0.33[.0]\r
+ * 1.2.27 13 10227 12.so.0.27[.0]\r
+ * 1.0.34 10 10034 10.so.0.34[.0]\r
+ * 1.2.28 13 10228 12.so.0.28[.0]\r
+ * 1.2.29beta01-03 13 10229 12.so.0.29[.0]\r
+ * 1.2.29rc01 13 10229 12.so.0.29[.0]\r
+ * 1.0.35 10 10035 10.so.0.35[.0]\r
+ * 1.2.29 13 10229 12.so.0.29[.0]\r
+ * 1.0.37 10 10037 10.so.0.37[.0]\r
+ * 1.2.30beta01-04 13 10230 12.so.0.30[.0]\r
+ * 1.0.38rc01-08 10 10038 10.so.0.38[.0]\r
+ * 1.2.30rc01-08 13 10230 12.so.0.30[.0]\r
+ * 1.0.38 10 10038 10.so.0.38[.0]\r
+ * 1.2.30 13 10230 12.so.0.30[.0]\r
+ * 1.0.39rc01-03 10 10039 10.so.0.39[.0]\r
+ * 1.2.31rc01-03 13 10231 12.so.0.31[.0]\r
+ * 1.0.39 10 10039 10.so.0.39[.0]\r
+ * 1.2.31 13 10231 12.so.0.31[.0]\r
+ * 1.2.32beta01-02 13 10232 12.so.0.32[.0]\r
+ * 1.0.40rc01 10 10040 10.so.0.40[.0]\r
+ * 1.2.32rc01 13 10232 12.so.0.32[.0]\r
+ * 1.0.40 10 10040 10.so.0.40[.0]\r
+ * 1.2.32 13 10232 12.so.0.32[.0]\r
+ * 1.2.33beta01-02 13 10233 12.so.0.33[.0]\r
+ * 1.2.33rc01-02 13 10233 12.so.0.33[.0]\r
+ * 1.0.41rc01 10 10041 10.so.0.41[.0]\r
+ * 1.2.33 13 10233 12.so.0.33[.0]\r
+ * 1.0.41 10 10041 10.so.0.41[.0]\r
+ *\r
+ * Henceforth the source version will match the shared-library major\r
+ * and minor numbers; the shared-library major version number will be\r
+ * used for changes in backward compatibility, as it is intended. The\r
+ * PNG_LIBPNG_VER macro, which is not used within libpng but is available\r
+ * for applications, is an unsigned integer of the form xyyzz corresponding\r
+ * to the source version x.y.z (leading zeros in y and z). Beta versions\r
+ * were given the previous public release number plus a letter, until\r
+ * version 1.0.6j; from then on they were given the upcoming public\r
+ * release number plus "betaNN" or "rcNN".\r
+ *\r
+ * Binary incompatibility exists only when applications make direct access\r
+ * to the info_ptr or png_ptr members through png.h, and the compiled\r
+ * application is loaded with a different version of the library.\r
+ *\r
+ * DLLNUM will change each time there are forward or backward changes\r
+ * in binary compatibility (e.g., when a new feature is added).\r
+ *\r
+ * See libpng.txt or libpng.3 for more information. The PNG specification\r
+ * is available as a W3C Recommendation and as an ISO Specification,\r
+ * <http://www.w3.org/TR/2003/REC-PNG-20031110/\r
+ */\r
+\r
+/*\r
+ * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:\r
+ *\r
+ * If you modify libpng you may insert additional notices immediately following\r
+ * this sentence.\r
+ *\r
+ * libpng versions 1.2.6, August 15, 2004, through 1.2.33, October 31, 2008, are\r
+ * Copyright (c) 2004, 2006-2008 Glenn Randers-Pehrson, and are\r
+ * distributed according to the same disclaimer and license as libpng-1.2.5\r
+ * with the following individual added to the list of Contributing Authors:\r
+ *\r
+ * Cosmin Truta\r
+ *\r
+ * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are\r
+ * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are\r
+ * distributed according to the same disclaimer and license as libpng-1.0.6\r
+ * with the following individuals added to the list of Contributing Authors:\r
+ *\r
+ * Simon-Pierre Cadieux\r
+ * Eric S. Raymond\r
+ * Gilles Vollant\r
+ *\r
+ * and with the following additions to the disclaimer:\r
+ *\r
+ * There is no warranty against interference with your enjoyment of the\r
+ * library or against infringement. There is no warranty that our\r
+ * efforts or the library will fulfill any of your particular purposes\r
+ * or needs. This library is provided with all faults, and the entire\r
+ * risk of satisfactory quality, performance, accuracy, and effort is with\r
+ * the user.\r
+ *\r
+ * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are\r
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are\r
+ * distributed according to the same disclaimer and license as libpng-0.96,\r
+ * with the following individuals added to the list of Contributing Authors:\r
+ *\r
+ * Tom Lane\r
+ * Glenn Randers-Pehrson\r
+ * Willem van Schaik\r
+ *\r
+ * libpng versions 0.89, June 1996, through 0.96, May 1997, are\r
+ * Copyright (c) 1996, 1997 Andreas Dilger\r
+ * Distributed according to the same disclaimer and license as libpng-0.88,\r
+ * with the following individuals added to the list of Contributing Authors:\r
+ *\r
+ * John Bowler\r
+ * Kevin Bracey\r
+ * Sam Bushell\r
+ * Magnus Holmgren\r
+ * Greg Roelofs\r
+ * Tom Tanner\r
+ *\r
+ * libpng versions 0.5, May 1995, through 0.88, January 1996, are\r
+ * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\r
+ *\r
+ * For the purposes of this copyright and license, "Contributing Authors"\r
+ * is defined as the following set of individuals:\r
+ *\r
+ * Andreas Dilger\r
+ * Dave Martindale\r
+ * Guy Eric Schalnat\r
+ * Paul Schmidt\r
+ * Tim Wegner\r
+ *\r
+ * The PNG Reference Library is supplied "AS IS". The Contributing Authors\r
+ * and Group 42, Inc. disclaim all warranties, expressed or implied,\r
+ * including, without limitation, the warranties of merchantability and of\r
+ * fitness for any purpose. The Contributing Authors and Group 42, Inc.\r
+ * assume no liability for direct, indirect, incidental, special, exemplary,\r
+ * or consequential damages, which may result from the use of the PNG\r
+ * Reference Library, even if advised of the possibility of such damage.\r
+ *\r
+ * Permission is hereby granted to use, copy, modify, and distribute this\r
+ * source code, or portions hereof, for any purpose, without fee, subject\r
+ * to the following restrictions:\r
+ *\r
+ * 1. The origin of this source code must not be misrepresented.\r
+ *\r
+ * 2. Altered versions must be plainly marked as such and\r
+ * must not be misrepresented as being the original source.\r
+ *\r
+ * 3. This Copyright notice may not be removed or altered from\r
+ * any source or altered source distribution.\r
+ *\r
+ * The Contributing Authors and Group 42, Inc. specifically permit, without\r
+ * fee, and encourage the use of this source code as a component to\r
+ * supporting the PNG file format in commercial products. If you use this\r
+ * source code in a product, acknowledgment is not required but would be\r
+ * appreciated.\r
+ */\r
+\r
+/*\r
+ * A "png_get_copyright" function is available, for convenient use in "about"\r
+ * boxes and the like:\r
+ *\r
+ * printf("%s",png_get_copyright(NULL));\r
+ *\r
+ * Also, the PNG logo (in PNG format, of course) is supplied in the\r
+ * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).\r
+ */\r
+\r
+/*\r
+ * Libpng is OSI Certified Open Source Software. OSI Certified is a\r
+ * certification mark of the Open Source Initiative.\r
+ */\r
+\r
+/*\r
+ * The contributing authors would like to thank all those who helped\r
+ * with testing, bug fixes, and patience. This wouldn't have been\r
+ * possible without all of you.\r
+ *\r
+ * Thanks to Frank J. T. Wojcik for helping with the documentation.\r
+ */\r
+\r
+/*\r
+ * Y2K compliance in libpng:\r
+ * =========================\r
+ *\r
+ * October 31, 2008\r
+ *\r
+ * Since the PNG Development group is an ad-hoc body, we can't make\r
+ * an official declaration.\r
+ *\r
+ * This is your unofficial assurance that libpng from version 0.71 and\r
+ * upward through 1.2.33 are Y2K compliant. It is my belief that earlier\r
+ * versions were also Y2K compliant.\r
+ *\r
+ * Libpng only has three year fields. One is a 2-byte unsigned integer\r
+ * that will hold years up to 65535. The other two hold the date in text\r
+ * format, and will hold years up to 9999.\r
+ *\r
+ * The integer is\r
+ * "png_uint_16 year" in png_time_struct.\r
+ *\r
+ * The strings are\r
+ * "png_charp time_buffer" in png_struct and\r
+ * "near_time_buffer", which is a local character string in png.c.\r
+ *\r
+ * There are seven time-related functions:\r
+ * png.c: png_convert_to_rfc_1123() in png.c\r
+ * (formerly png_convert_to_rfc_1152() in error)\r
+ * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c\r
+ * png_convert_from_time_t() in pngwrite.c\r
+ * png_get_tIME() in pngget.c\r
+ * png_handle_tIME() in pngrutil.c, called in pngread.c\r
+ * png_set_tIME() in pngset.c\r
+ * png_write_tIME() in pngwutil.c, called in pngwrite.c\r
+ *\r
+ * All handle dates properly in a Y2K environment. The\r
+ * png_convert_from_time_t() function calls gmtime() to convert from system\r
+ * clock time, which returns (year - 1900), which we properly convert to\r
+ * the full 4-digit year. There is a possibility that applications using\r
+ * libpng are not passing 4-digit years into the png_convert_to_rfc_1123()\r
+ * function, or that they are incorrectly passing only a 2-digit year\r
+ * instead of "year - 1900" into the png_convert_from_struct_tm() function,\r
+ * but this is not under our control. The libpng documentation has always\r
+ * stated that it works with 4-digit years, and the APIs have been\r
+ * documented as such.\r
+ *\r
+ * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned\r
+ * integer to hold the year, and can hold years as large as 65535.\r
+ *\r
+ * zlib, upon which libpng depends, is also Y2K compliant. It contains\r
+ * no date-related code.\r
+ *\r
+ * Glenn Randers-Pehrson\r
+ * libpng maintainer\r
+ * PNG Development Group\r
+ */\r
+\r
+#ifndef PNG_H\r
+#define PNG_H\r
+\r
+/* This is not the place to learn how to use libpng. The file libpng.txt\r
+ * describes how to use libpng, and the file example.c summarizes it\r
+ * with some code on which to build. This file is useful for looking\r
+ * at the actual function definitions and structure components.\r
+ */\r
+\r
+/* Version information for png.h - this should match the version in png.c */\r
+#define PNG_LIBPNG_VER_STRING "1.2.33"\r
+#define PNG_HEADER_VERSION_STRING \\r
+ " libpng version 1.2.33 - October 31, 2008\n"\r
+\r
+#define PNG_LIBPNG_VER_SONUM 0\r
+#define PNG_LIBPNG_VER_DLLNUM 13\r
+\r
+/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */\r
+#define PNG_LIBPNG_VER_MAJOR 1\r
+#define PNG_LIBPNG_VER_MINOR 2\r
+#define PNG_LIBPNG_VER_RELEASE 33\r
+/* This should match the numeric part of the final component of\r
+ * PNG_LIBPNG_VER_STRING, omitting any leading zero: */\r
+\r
+#define PNG_LIBPNG_VER_BUILD 0\r
+\r
+/* Release Status */\r
+#define PNG_LIBPNG_BUILD_ALPHA 1\r
+#define PNG_LIBPNG_BUILD_BETA 2\r
+#define PNG_LIBPNG_BUILD_RC 3\r
+#define PNG_LIBPNG_BUILD_STABLE 4\r
+#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7\r
+ \r
+/* Release-Specific Flags */\r
+#define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with\r
+ PNG_LIBPNG_BUILD_STABLE only */\r
+#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with\r
+ PNG_LIBPNG_BUILD_SPECIAL */\r
+#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with\r
+ PNG_LIBPNG_BUILD_PRIVATE */\r
+\r
+#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE\r
+\r
+/* Careful here. At one time, Guy wanted to use 082, but that would be octal.\r
+ * We must not include leading zeros.\r
+ * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only\r
+ * version 1.0.0 was mis-numbered 100 instead of 10000). From\r
+ * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */\r
+#define PNG_LIBPNG_VER 10233 /* 1.2.33 */\r
+\r
+#ifndef PNG_VERSION_INFO_ONLY\r
+/* include the compression library's header */\r
+#include "zlib.h"\r
+#endif\r
+\r
+/* include all user configurable info, including optional assembler routines */\r
+#include "pngconf.h"\r
+\r
+/*\r
+ * Added at libpng-1.2.8 */\r
+/* Ref MSDN: Private as priority over Special\r
+ * VS_FF_PRIVATEBUILD File *was not* built using standard release\r
+ * procedures. If this value is given, the StringFileInfo block must\r
+ * contain a PrivateBuild string. \r
+ *\r
+ * VS_FF_SPECIALBUILD File *was* built by the original company using\r
+ * standard release procedures but is a variation of the standard\r
+ * file of the same version number. If this value is given, the\r
+ * StringFileInfo block must contain a SpecialBuild string. \r
+ */\r
+\r
+#if defined(PNG_USER_PRIVATEBUILD)\r
+# define PNG_LIBPNG_BUILD_TYPE \\r
+ (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)\r
+#else\r
+# if defined(PNG_LIBPNG_SPECIALBUILD)\r
+# define PNG_LIBPNG_BUILD_TYPE \\r
+ (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)\r
+# else\r
+# define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)\r
+# endif\r
+#endif\r
+\r
+#ifndef PNG_VERSION_INFO_ONLY\r
+\r
+/* Inhibit C++ name-mangling for libpng functions but not for system calls. */\r
+#ifdef __cplusplus\r
+extern "C" {\r
+#endif /* __cplusplus */\r
+\r
+/* This file is arranged in several sections. The first section contains\r
+ * structure and type definitions. The second section contains the external\r
+ * library functions, while the third has the internal library functions,\r
+ * which applications aren't expected to use directly.\r
+ */\r
+\r
+#ifndef PNG_NO_TYPECAST_NULL\r
+#define int_p_NULL (int *)NULL\r
+#define png_bytep_NULL (png_bytep)NULL\r
+#define png_bytepp_NULL (png_bytepp)NULL\r
+#define png_doublep_NULL (png_doublep)NULL\r
+#define png_error_ptr_NULL (png_error_ptr)NULL\r
+#define png_flush_ptr_NULL (png_flush_ptr)NULL\r
+#define png_free_ptr_NULL (png_free_ptr)NULL\r
+#define png_infopp_NULL (png_infopp)NULL\r
+#define png_malloc_ptr_NULL (png_malloc_ptr)NULL\r
+#define png_read_status_ptr_NULL (png_read_status_ptr)NULL\r
+#define png_rw_ptr_NULL (png_rw_ptr)NULL\r
+#define png_structp_NULL (png_structp)NULL\r
+#define png_uint_16p_NULL (png_uint_16p)NULL\r
+#define png_voidp_NULL (png_voidp)NULL\r
+#define png_write_status_ptr_NULL (png_write_status_ptr)NULL\r
+#else\r
+#define int_p_NULL NULL\r
+#define png_bytep_NULL NULL\r
+#define png_bytepp_NULL NULL\r
+#define png_doublep_NULL NULL\r
+#define png_error_ptr_NULL NULL\r
+#define png_flush_ptr_NULL NULL\r
+#define png_free_ptr_NULL NULL\r
+#define png_infopp_NULL NULL\r
+#define png_malloc_ptr_NULL NULL\r
+#define png_read_status_ptr_NULL NULL\r
+#define png_rw_ptr_NULL NULL\r
+#define png_structp_NULL NULL\r
+#define png_uint_16p_NULL NULL\r
+#define png_voidp_NULL NULL\r
+#define png_write_status_ptr_NULL NULL\r
+#endif\r
+\r
+/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */\r
+#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)\r
+/* Version information for C files, stored in png.c. This had better match\r
+ * the version above.\r
+ */\r
+#ifdef PNG_USE_GLOBAL_ARRAYS\r
+PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];\r
+ /* need room for 99.99.99beta99z */\r
+#else\r
+#define png_libpng_ver png_get_header_ver(NULL)\r
+#endif\r
+\r
+#ifdef PNG_USE_GLOBAL_ARRAYS\r
+/* This was removed in version 1.0.5c */\r
+/* Structures to facilitate easy interlacing. See png.c for more details */\r
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7];\r
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7];\r
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7];\r
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7];\r
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7];\r
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7];\r
+/* This isn't currently used. If you need it, see png.c for more details.\r
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];\r
+*/\r
+#endif\r
+\r
+#endif /* PNG_NO_EXTERN */\r
+\r
+/* Three color definitions. The order of the red, green, and blue, (and the\r
+ * exact size) is not important, although the size of the fields need to\r
+ * be png_byte or png_uint_16 (as defined below).\r
+ */\r
+typedef struct png_color_struct\r
+{\r
+ png_byte red;\r
+ png_byte green;\r
+ png_byte blue;\r
+} png_color;\r
+typedef png_color FAR * png_colorp;\r
+typedef png_color FAR * FAR * png_colorpp;\r
+\r
+typedef struct png_color_16_struct\r
+{\r
+ png_byte index; /* used for palette files */\r
+ png_uint_16 red; /* for use in red green blue files */\r
+ png_uint_16 green;\r
+ png_uint_16 blue;\r
+ png_uint_16 gray; /* for use in grayscale files */\r
+} png_color_16;\r
+typedef png_color_16 FAR * png_color_16p;\r
+typedef png_color_16 FAR * FAR * png_color_16pp;\r
+\r
+typedef struct png_color_8_struct\r
+{\r
+ png_byte red; /* for use in red green blue files */\r
+ png_byte green;\r
+ png_byte blue;\r
+ png_byte gray; /* for use in grayscale files */\r
+ png_byte alpha; /* for alpha channel files */\r
+} png_color_8;\r
+typedef png_color_8 FAR * png_color_8p;\r
+typedef png_color_8 FAR * FAR * png_color_8pp;\r
+\r
+/*\r
+ * The following two structures are used for the in-core representation\r
+ * of sPLT chunks.\r
+ */\r
+typedef struct png_sPLT_entry_struct\r
+{\r
+ png_uint_16 red;\r
+ png_uint_16 green;\r
+ png_uint_16 blue;\r
+ png_uint_16 alpha;\r
+ png_uint_16 frequency;\r
+} png_sPLT_entry;\r
+typedef png_sPLT_entry FAR * png_sPLT_entryp;\r
+typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;\r
+\r
+/* When the depth of the sPLT palette is 8 bits, the color and alpha samples\r
+ * occupy the LSB of their respective members, and the MSB of each member\r
+ * is zero-filled. The frequency member always occupies the full 16 bits.\r
+ */\r
+\r
+typedef struct png_sPLT_struct\r
+{\r
+ png_charp name; /* palette name */\r
+ png_byte depth; /* depth of palette samples */\r
+ png_sPLT_entryp entries; /* palette entries */\r
+ png_int_32 nentries; /* number of palette entries */\r
+} png_sPLT_t;\r
+typedef png_sPLT_t FAR * png_sPLT_tp;\r
+typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;\r
+\r
+#ifdef PNG_TEXT_SUPPORTED\r
+/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,\r
+ * and whether that contents is compressed or not. The "key" field\r
+ * points to a regular zero-terminated C string. The "text", "lang", and\r
+ * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.\r
+ * However, the * structure returned by png_get_text() will always contain\r
+ * regular zero-terminated C strings (possibly empty), never NULL pointers,\r
+ * so they can be safely used in printf() and other string-handling functions.\r
+ */\r
+typedef struct png_text_struct\r
+{\r
+ int compression; /* compression value:\r
+ -1: tEXt, none\r
+ 0: zTXt, deflate\r
+ 1: iTXt, none\r
+ 2: iTXt, deflate */\r
+ png_charp key; /* keyword, 1-79 character description of "text" */\r
+ png_charp text; /* comment, may be an empty string (ie "")\r
+ or a NULL pointer */\r
+ png_size_t text_length; /* length of the text string */\r
+#ifdef PNG_iTXt_SUPPORTED\r
+ png_size_t itxt_length; /* length of the itxt string */\r
+ png_charp lang; /* language code, 0-79 characters\r
+ or a NULL pointer */\r
+ png_charp lang_key; /* keyword translated UTF-8 string, 0 or more\r
+ chars or a NULL pointer */\r
+#endif\r
+} png_text;\r
+typedef png_text FAR * png_textp;\r
+typedef png_text FAR * FAR * png_textpp;\r
+#endif\r
+\r
+/* Supported compression types for text in PNG files (tEXt, and zTXt).\r
+ * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */\r
+#define PNG_TEXT_COMPRESSION_NONE_WR -3\r
+#define PNG_TEXT_COMPRESSION_zTXt_WR -2\r
+#define PNG_TEXT_COMPRESSION_NONE -1\r
+#define PNG_TEXT_COMPRESSION_zTXt 0\r
+#define PNG_ITXT_COMPRESSION_NONE 1\r
+#define PNG_ITXT_COMPRESSION_zTXt 2\r
+#define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */\r
+\r
+/* png_time is a way to hold the time in an machine independent way.\r
+ * Two conversions are provided, both from time_t and struct tm. There\r
+ * is no portable way to convert to either of these structures, as far\r
+ * as I know. If you know of a portable way, send it to me. As a side\r
+ * note - PNG has always been Year 2000 compliant!\r
+ */\r
+typedef struct png_time_struct\r
+{\r
+ png_uint_16 year; /* full year, as in, 1995 */\r
+ png_byte month; /* month of year, 1 - 12 */\r
+ png_byte day; /* day of month, 1 - 31 */\r
+ png_byte hour; /* hour of day, 0 - 23 */\r
+ png_byte minute; /* minute of hour, 0 - 59 */\r
+ png_byte second; /* second of minute, 0 - 60 (for leap seconds) */\r
+} png_time;\r
+typedef png_time FAR * png_timep;\r
+typedef png_time FAR * FAR * png_timepp;\r
+\r
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)\r
+/* png_unknown_chunk is a structure to hold queued chunks for which there is\r
+ * no specific support. The idea is that we can use this to queue\r
+ * up private chunks for output even though the library doesn't actually\r
+ * know about their semantics.\r
+ */\r
+#define PNG_CHUNK_NAME_LENGTH 5\r
+typedef struct png_unknown_chunk_t\r
+{\r
+ png_byte name[PNG_CHUNK_NAME_LENGTH];\r
+ png_byte *data;\r
+ png_size_t size;\r
+\r
+ /* libpng-using applications should NOT directly modify this byte. */\r
+ png_byte location; /* mode of operation at read time */\r
+}\r
+png_unknown_chunk;\r
+typedef png_unknown_chunk FAR * png_unknown_chunkp;\r
+typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;\r
+#endif\r
+\r
+/* png_info is a structure that holds the information in a PNG file so\r
+ * that the application can find out the characteristics of the image.\r
+ * If you are reading the file, this structure will tell you what is\r
+ * in the PNG file. If you are writing the file, fill in the information\r
+ * you want to put into the PNG file, then call png_write_info().\r
+ * The names chosen should be very close to the PNG specification, so\r
+ * consult that document for information about the meaning of each field.\r
+ *\r
+ * With libpng < 0.95, it was only possible to directly set and read the\r
+ * the values in the png_info_struct, which meant that the contents and\r
+ * order of the values had to remain fixed. With libpng 0.95 and later,\r
+ * however, there are now functions that abstract the contents of\r
+ * png_info_struct from the application, so this makes it easier to use\r
+ * libpng with dynamic libraries, and even makes it possible to use\r
+ * libraries that don't have all of the libpng ancillary chunk-handing\r
+ * functionality.\r
+ *\r
+ * In any case, the order of the parameters in png_info_struct should NOT\r
+ * be changed for as long as possible to keep compatibility with applications\r
+ * that use the old direct-access method with png_info_struct.\r
+ *\r
+ * The following members may have allocated storage attached that should be\r
+ * cleaned up before the structure is discarded: palette, trans, text,\r
+ * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,\r
+ * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these\r
+ * are automatically freed when the info structure is deallocated, if they were\r
+ * allocated internally by libpng. This behavior can be changed by means\r
+ * of the png_data_freer() function.\r
+ *\r
+ * More allocation details: all the chunk-reading functions that\r
+ * change these members go through the corresponding png_set_*\r
+ * functions. A function to clear these members is available: see\r
+ * png_free_data(). The png_set_* functions do not depend on being\r
+ * able to point info structure members to any of the storage they are\r
+ * passed (they make their own copies), EXCEPT that the png_set_text\r
+ * functions use the same storage passed to them in the text_ptr or\r
+ * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns\r
+ * functions do not make their own copies.\r
+ */\r
+typedef struct png_info_struct\r
+{\r
+ /* the following are necessary for every PNG file */\r
+ png_uint_32 width; /* width of image in pixels (from IHDR) */\r
+ png_uint_32 height; /* height of image in pixels (from IHDR) */\r
+ png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */\r
+ png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */\r
+ png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */\r
+ png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */\r
+ png_uint_16 num_trans; /* number of transparent palette color (tRNS) */\r
+ png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */\r
+ png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */\r
+ /* The following three should have been named *_method not *_type */\r
+ png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */\r
+ png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */\r
+ png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */\r
+\r
+ /* The following is informational only on read, and not used on writes. */\r
+ png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */\r
+ png_byte pixel_depth; /* number of bits per pixel */\r
+ png_byte spare_byte; /* to align the data, and for future use */\r
+ png_byte signature[8]; /* magic bytes read by libpng from start of file */\r
+\r
+ /* The rest of the data is optional. If you are reading, check the\r
+ * valid field to see if the information in these are valid. If you\r
+ * are writing, set the valid field to those chunks you want written,\r
+ * and initialize the appropriate fields below.\r
+ */\r
+\r
+#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)\r
+ /* The gAMA chunk describes the gamma characteristics of the system\r
+ * on which the image was created, normally in the range [1.0, 2.5].\r
+ * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.\r
+ */\r
+ float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */\r
+#endif\r
+\r
+#if defined(PNG_sRGB_SUPPORTED)\r
+ /* GR-P, 0.96a */\r
+ /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */\r
+ png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */\r
+#endif\r
+\r
+#if defined(PNG_TEXT_SUPPORTED)\r
+ /* The tEXt, and zTXt chunks contain human-readable textual data in\r
+ * uncompressed, compressed, and optionally compressed forms, respectively.\r
+ * The data in "text" is an array of pointers to uncompressed,\r
+ * null-terminated C strings. Each chunk has a keyword that describes the\r
+ * textual data contained in that chunk. Keywords are not required to be\r
+ * unique, and the text string may be empty. Any number of text chunks may\r
+ * be in an image.\r
+ */\r
+ int num_text; /* number of comments read/to write */\r
+ int max_text; /* current size of text array */\r
+ png_textp text; /* array of comments read/to write */\r
+#endif /* PNG_TEXT_SUPPORTED */\r
+\r
+#if defined(PNG_tIME_SUPPORTED)\r
+ /* The tIME chunk holds the last time the displayed image data was\r
+ * modified. See the png_time struct for the contents of this struct.\r
+ */\r
+ png_time mod_time;\r
+#endif\r
+\r
+#if defined(PNG_sBIT_SUPPORTED)\r
+ /* The sBIT chunk specifies the number of significant high-order bits\r
+ * in the pixel data. Values are in the range [1, bit_depth], and are\r
+ * only specified for the channels in the pixel data. The contents of\r
+ * the low-order bits is not specified. Data is valid if\r
+ * (valid & PNG_INFO_sBIT) is non-zero.\r
+ */\r
+ png_color_8 sig_bit; /* significant bits in color channels */\r
+#endif\r
+\r
+#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \\r
+defined(PNG_READ_BACKGROUND_SUPPORTED)\r
+ /* The tRNS chunk supplies transparency data for paletted images and\r
+ * other image types that don't need a full alpha channel. There are\r
+ * "num_trans" transparency values for a paletted image, stored in the\r
+ * same order as the palette colors, starting from index 0. Values\r
+ * for the data are in the range [0, 255], ranging from fully transparent\r
+ * to fully opaque, respectively. For non-paletted images, there is a\r
+ * single color specified that should be treated as fully transparent.\r
+ * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.\r
+ */\r
+ png_bytep trans; /* transparent values for paletted image */\r
+ png_color_16 trans_values; /* transparent color for non-palette image */\r
+#endif\r
+\r
+#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)\r
+ /* The bKGD chunk gives the suggested image background color if the\r
+ * display program does not have its own background color and the image\r
+ * is needs to composited onto a background before display. The colors\r
+ * in "background" are normally in the same color space/depth as the\r
+ * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.\r
+ */\r
+ png_color_16 background;\r
+#endif\r
+\r
+#if defined(PNG_oFFs_SUPPORTED)\r
+ /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards\r
+ * and downwards from the top-left corner of the display, page, or other\r
+ * application-specific co-ordinate space. See the PNG_OFFSET_ defines\r
+ * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.\r
+ */\r
+ png_int_32 x_offset; /* x offset on page */\r
+ png_int_32 y_offset; /* y offset on page */\r
+ png_byte offset_unit_type; /* offset units type */\r
+#endif\r
+\r
+#if defined(PNG_pHYs_SUPPORTED)\r
+ /* The pHYs chunk gives the physical pixel density of the image for\r
+ * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_\r
+ * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.\r
+ */\r
+ png_uint_32 x_pixels_per_unit; /* horizontal pixel density */\r
+ png_uint_32 y_pixels_per_unit; /* vertical pixel density */\r
+ png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */\r
+#endif\r
+\r
+#if defined(PNG_hIST_SUPPORTED)\r
+ /* The hIST chunk contains the relative frequency or importance of the\r
+ * various palette entries, so that a viewer can intelligently select a\r
+ * reduced-color palette, if required. Data is an array of "num_palette"\r
+ * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)\r
+ * is non-zero.\r
+ */\r
+ png_uint_16p hist;\r
+#endif\r
+\r
+#ifdef PNG_cHRM_SUPPORTED\r
+ /* The cHRM chunk describes the CIE color characteristics of the monitor\r
+ * on which the PNG was created. This data allows the viewer to do gamut\r
+ * mapping of the input image to ensure that the viewer sees the same\r
+ * colors in the image as the creator. Values are in the range\r
+ * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.\r
+ */\r
+#ifdef PNG_FLOATING_POINT_SUPPORTED\r
+ float x_white;\r
+ float y_white;\r
+ float x_red;\r
+ float y_red;\r
+ float x_green;\r
+ float y_green;\r
+ float x_blue;\r
+ float y_blue;\r
+#endif\r
+#endif\r
+\r
+#if defined(PNG_pCAL_SUPPORTED)\r
+ /* The pCAL chunk describes a transformation between the stored pixel\r
+ * values and original physical data values used to create the image.\r
+ * The integer range [0, 2^bit_depth - 1] maps to the floating-point\r
+ * range given by [pcal_X0, pcal_X1], and are further transformed by a\r
+ * (possibly non-linear) transformation function given by "pcal_type"\r
+ * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_\r
+ * defines below, and the PNG-Group's PNG extensions document for a\r
+ * complete description of the transformations and how they should be\r
+ * implemented, and for a description of the ASCII parameter strings.\r
+ * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.\r
+ */\r
+ png_charp pcal_purpose; /* pCAL chunk description string */\r
+ png_int_32 pcal_X0; /* minimum value */\r
+ png_int_32 pcal_X1; /* maximum value */\r
+ png_charp pcal_units; /* Latin-1 string giving physical units */\r
+ png_charpp pcal_params; /* ASCII strings containing parameter values */\r
+ png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */\r
+ png_byte pcal_nparams; /* number of parameters given in pcal_params */\r
+#endif\r
+\r
+/* New members added in libpng-1.0.6 */\r
+#ifdef PNG_FREE_ME_SUPPORTED\r
+ png_uint_32 free_me; /* flags items libpng is responsible for freeing */\r
+#endif\r
+\r
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)\r
+ /* storage for unknown chunks that the library doesn't recognize. */\r
+ png_unknown_chunkp unknown_chunks;\r
+ png_size_t unknown_chunks_num;\r
+#endif\r
+\r
+#if defined(PNG_iCCP_SUPPORTED)\r
+ /* iCCP chunk data. */\r
+ png_charp iccp_name; /* profile name */\r
+ png_charp iccp_profile; /* International Color Consortium profile data */\r
+ /* Note to maintainer: should be png_bytep */\r
+ png_uint_32 iccp_proflen; /* ICC profile data length */\r
+ png_byte iccp_compression; /* Always zero */\r
+#endif\r
+\r
+#if defined(PNG_sPLT_SUPPORTED)\r
+ /* data on sPLT chunks (there may be more than one). */\r
+ png_sPLT_tp splt_palettes;\r
+ png_uint_32 splt_palettes_num;\r
+#endif\r
+\r
+#if defined(PNG_sCAL_SUPPORTED)\r
+ /* The sCAL chunk describes the actual physical dimensions of the\r
+ * subject matter of the graphic. The chunk contains a unit specification\r
+ * a byte value, and two ASCII strings representing floating-point\r
+ * values. The values are width and height corresponsing to one pixel\r
+ * in the image. This external representation is converted to double\r
+ * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.\r
+ */\r
+ png_byte scal_unit; /* unit of physical scale */\r
+#ifdef PNG_FLOATING_POINT_SUPPORTED\r
+ double scal_pixel_width; /* width of one pixel */\r
+ double scal_pixel_height; /* height of one pixel */\r
+#endif\r
+#ifdef PNG_FIXED_POINT_SUPPORTED\r
+ png_charp scal_s_width; /* string containing height */\r
+ png_charp scal_s_height; /* string containing width */\r
+#endif\r
+#endif\r
+\r
+#if defined(PNG_INFO_IMAGE_SUPPORTED)\r
+ /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */\r
+ /* Data valid if (valid & PNG_INFO_IDAT) non-zero */\r
+ png_bytepp row_pointers; /* the image bits */\r
+#endif\r
+\r
+#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)\r
+ png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */\r
+#endif\r
+\r
+#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)\r
+ png_fixed_point int_x_white;\r
+ png_fixed_point int_y_white;\r
+ png_fixed_point int_x_red;\r
+ png_fixed_point int_y_red;\r
+ png_fixed_point int_x_green;\r
+ png_fixed_point int_y_green;\r
+ png_fixed_point int_x_blue;\r
+ png_fixed_point int_y_blue;\r
+#endif\r
+\r
+} png_info;\r
+\r
+typedef png_info FAR * png_infop;\r
+typedef png_info FAR * FAR * png_infopp;\r
+\r
+/* Maximum positive integer used in PNG is (2^31)-1 */\r
+#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)\r
+#define PNG_UINT_32_MAX ((png_uint_32)(-1))\r
+#define PNG_SIZE_MAX ((png_size_t)(-1))\r
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)\r
+/* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */\r
+#define PNG_MAX_UINT PNG_UINT_31_MAX\r
+#endif\r
+\r
+/* These describe the color_type field in png_info. */\r
+/* color type masks */\r
+#define PNG_COLOR_MASK_PALETTE 1\r
+#define PNG_COLOR_MASK_COLOR 2\r
+#define PNG_COLOR_MASK_ALPHA 4\r
+\r
+/* color types. Note that not all combinations are legal */\r
+#define PNG_COLOR_TYPE_GRAY 0\r
+#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)\r
+#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)\r
+#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)\r
+#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)\r
+/* aliases */\r
+#define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA\r
+#define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA\r
+\r
+/* This is for compression type. PNG 1.0-1.2 only define the single type. */\r
+#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */\r
+#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE\r
+\r
+/* This is for filter type. PNG 1.0-1.2 only define the single type. */\r
+#define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */\r
+#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */\r
+#define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE\r
+\r
+/* These are for the interlacing type. These values should NOT be changed. */\r
+#define PNG_INTERLACE_NONE 0 /* Non-interlaced image */\r
+#define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */\r
+#define PNG_INTERLACE_LAST 2 /* Not a valid value */\r
+\r
+/* These are for the oFFs chunk. These values should NOT be changed. */\r
+#define PNG_OFFSET_PIXEL 0 /* Offset in pixels */\r
+#define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */\r
+#define PNG_OFFSET_LAST 2 /* Not a valid value */\r
+\r
+/* These are for the pCAL chunk. These values should NOT be changed. */\r
+#define PNG_EQUATION_LINEAR 0 /* Linear transformation */\r
+#define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */\r
+#define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */\r
+#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */\r
+#define PNG_EQUATION_LAST 4 /* Not a valid value */\r
+\r
+/* These are for the sCAL chunk. These values should NOT be changed. */\r
+#define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */\r
+#define PNG_SCALE_METER 1 /* meters per pixel */\r
+#define PNG_SCALE_RADIAN 2 /* radians per pixel */\r
+#define PNG_SCALE_LAST 3 /* Not a valid value */\r
+\r
+/* These are for the pHYs chunk. These values should NOT be changed. */\r
+#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */\r
+#define PNG_RESOLUTION_METER 1 /* pixels/meter */\r
+#define PNG_RESOLUTION_LAST 2 /* Not a valid value */\r
+\r
+/* These are for the sRGB chunk. These values should NOT be changed. */\r
+#define PNG_sRGB_INTENT_PERCEPTUAL 0\r
+#define PNG_sRGB_INTENT_RELATIVE 1\r
+#define PNG_sRGB_INTENT_SATURATION 2\r
+#define PNG_sRGB_INTENT_ABSOLUTE 3\r
+#define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */\r
+\r
+/* This is for text chunks */\r
+#define PNG_KEYWORD_MAX_LENGTH 79\r
+\r
+/* Maximum number of entries in PLTE/sPLT/tRNS arrays */\r
+#define PNG_MAX_PALETTE_LENGTH 256\r
+\r
+/* These determine if an ancillary chunk's data has been successfully read\r
+ * from the PNG header, or if the application has filled in the corresponding\r
+ * data in the info_struct to be written into the output file. The values\r
+ * of the PNG_INFO_<chunk> defines should NOT be changed.\r
+ */\r
+#define PNG_INFO_gAMA 0x0001\r
+#define PNG_INFO_sBIT 0x0002\r
+#define PNG_INFO_cHRM 0x0004\r
+#define PNG_INFO_PLTE 0x0008\r
+#define PNG_INFO_tRNS 0x0010\r
+#define PNG_INFO_bKGD 0x0020\r
+#define PNG_INFO_hIST 0x0040\r
+#define PNG_INFO_pHYs 0x0080\r
+#define PNG_INFO_oFFs 0x0100\r
+#define PNG_INFO_tIME 0x0200\r
+#define PNG_INFO_pCAL 0x0400\r
+#define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */\r
+#define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */\r
+#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */\r
+#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */\r
+#define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */\r
+\r
+/* This is used for the transformation routines, as some of them\r
+ * change these values for the row. It also should enable using\r
+ * the routines for other purposes.\r
+ */\r
+typedef struct png_row_info_struct\r
+{\r
+ png_uint_32 width; /* width of row */\r
+ png_uint_32 rowbytes; /* number of bytes in row */\r
+ png_byte color_type; /* color type of row */\r
+ png_byte bit_depth; /* bit depth of row */\r
+ png_byte channels; /* number of channels (1, 2, 3, or 4) */\r
+ png_byte pixel_depth; /* bits per pixel (depth * channels) */\r
+} png_row_info;\r
+\r
+typedef png_row_info FAR * png_row_infop;\r
+typedef png_row_info FAR * FAR * png_row_infopp;\r
+\r
+/* These are the function types for the I/O functions and for the functions\r
+ * that allow the user to override the default I/O functions with his or her\r
+ * own. The png_error_ptr type should match that of user-supplied warning\r
+ * and error functions, while the png_rw_ptr type should match that of the\r
+ * user read/write data functions.\r
+ */\r
+typedef struct png_struct_def png_struct;\r
+typedef png_struct FAR * png_structp;\r
+\r
+typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));\r
+typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));\r
+typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));\r
+typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,\r
+ int));\r
+typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,\r
+ int));\r
+\r
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED\r
+typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));\r
+typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));\r
+typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,\r
+ png_uint_32, int));\r
+#endif\r
+\r
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \\r
+ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \\r
+ defined(PNG_LEGACY_SUPPORTED)\r
+typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,\r
+ png_row_infop, png_bytep));\r
+#endif\r
+\r
+#if defined(PNG_USER_CHUNKS_SUPPORTED)\r
+typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));\r
+#endif\r
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)\r
+typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));\r
+#endif\r
+\r
+/* Transform masks for the high-level interface */\r
+#define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */\r
+#define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */\r
+#define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */\r
+#define PNG_TRANSFORM_PACKING 0x0004 /* read and write */\r
+#define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */\r
+#define PNG_TRANSFORM_EXPAND 0x0010 /* read only */\r
+#define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */\r
+#define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */\r
+#define PNG_TRANSFORM_BGR 0x0080 /* read and write */\r
+#define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */\r
+#define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */\r
+#define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */\r
+#define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */\r
+\r
+/* Flags for MNG supported features */\r
+#define PNG_FLAG_MNG_EMPTY_PLTE 0x01\r
+#define PNG_FLAG_MNG_FILTER_64 0x04\r
+#define PNG_ALL_MNG_FEATURES 0x05\r
+\r
+typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));\r
+typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));\r
+\r
+/* The structure that holds the information to read and write PNG files.\r
+ * The only people who need to care about what is inside of this are the\r
+ * people who will be modifying the library for their own special needs.\r
+ * It should NOT be accessed directly by an application, except to store\r
+ * the jmp_buf.\r
+ */\r
+\r
+struct png_struct_def\r
+{\r
+#ifdef PNG_SETJMP_SUPPORTED\r
+ jmp_buf jmpbuf; /* used in png_error */\r
+#endif\r
+ png_error_ptr error_fn; /* function for printing errors and aborting */\r
+ png_error_ptr warning_fn; /* function for printing warnings */\r
+ png_voidp error_ptr; /* user supplied struct for error functions */\r
+ png_rw_ptr write_data_fn; /* function for writing output data */\r
+ png_rw_ptr read_data_fn; /* function for reading input data */\r
+ png_voidp io_ptr; /* ptr to application struct for I/O functions */\r
+\r
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)\r
+ png_user_transform_ptr read_user_transform_fn; /* user read transform */\r
+#endif\r
+\r
+#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)\r
+ png_user_transform_ptr write_user_transform_fn; /* user write transform */\r
+#endif\r
+\r
+/* These were added in libpng-1.0.2 */\r
+#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)\r
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \\r
+ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)\r
+ png_voidp user_transform_ptr; /* user supplied struct for user transform */\r
+ png_byte user_transform_depth; /* bit depth of user transformed pixels */\r
+ png_byte user_transform_channels; /* channels in user transformed pixels */\r
+#endif\r
+#endif\r
+\r
+ png_uint_32 mode; /* tells us where we are in the PNG file */\r
+ png_uint_32 flags; /* flags indicating various things to libpng */\r
+ png_uint_32 transformations; /* which transformations to perform */\r
+\r
+ z_stream zstream; /* pointer to decompression structure (below) */\r
+ png_bytep zbuf; /* buffer for zlib */\r
+ png_size_t zbuf_size; /* size of zbuf */\r
+ int zlib_level; /* holds zlib compression level */\r
+ int zlib_method; /* holds zlib compression method */\r
+ int zlib_window_bits; /* holds zlib compression window bits */\r
+ int zlib_mem_level; /* holds zlib compression memory level */\r
+ int zlib_strategy; /* holds zlib compression strategy */\r
+\r
+ png_uint_32 width; /* width of image in pixels */\r
+ png_uint_32 height; /* height of image in pixels */\r
+ png_uint_32 num_rows; /* number of rows in current pass */\r
+ png_uint_32 usr_width; /* width of row at start of write */\r
+ png_uint_32 rowbytes; /* size of row in bytes */\r
+ png_uint_32 irowbytes; /* size of current interlaced row in bytes */\r
+ png_uint_32 iwidth; /* width of current interlaced row in pixels */\r
+ png_uint_32 row_number; /* current row in interlace pass */\r
+ png_bytep prev_row; /* buffer to save previous (unfiltered) row */\r
+ png_bytep row_buf; /* buffer to save current (unfiltered) row */\r
+#ifndef PNG_NO_WRITE_FILTER\r
+ png_bytep sub_row; /* buffer to save "sub" row when filtering */\r
+ png_bytep up_row; /* buffer to save "up" row when filtering */\r
+ png_bytep avg_row; /* buffer to save "avg" row when filtering */\r
+ png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */\r
+#endif\r
+ png_row_info row_info; /* used for transformation routines */\r
+\r
+ png_uint_32 idat_size; /* current IDAT size for read */\r
+ png_uint_32 crc; /* current chunk CRC value */\r
+ png_colorp palette; /* palette from the input file */\r
+ png_uint_16 num_palette; /* number of color entries in palette */\r
+ png_uint_16 num_trans; /* number of transparency values */\r
+ png_byte chunk_name[5]; /* null-terminated name of current chunk */\r
+ png_byte compression; /* file compression type (always 0) */\r
+ png_byte filter; /* file filter type (always 0) */\r
+ png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */\r
+ png_byte pass; /* current interlace pass (0 - 6) */\r
+ png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */\r
+ png_byte color_type; /* color type of file */\r
+ png_byte bit_depth; /* bit depth of file */\r
+ png_byte usr_bit_depth; /* bit depth of users row */\r
+ png_byte pixel_depth; /* number of bits per pixel */\r
+ png_byte channels; /* number of channels in file */\r
+ png_byte usr_channels; /* channels at start of write */\r
+ png_byte sig_bytes; /* magic bytes read/written from start of file */\r
+\r
+#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)\r
+#ifdef PNG_LEGACY_SUPPORTED\r
+ png_byte filler; /* filler byte for pixel expansion */\r
+#else\r
+ png_uint_16 filler; /* filler bytes for pixel expansion */\r
+#endif\r
+#endif\r
+\r
+#if defined(PNG_bKGD_SUPPORTED)\r
+ png_byte background_gamma_type;\r
+# ifdef PNG_FLOATING_POINT_SUPPORTED\r
+ float background_gamma;\r
+# endif\r
+ png_color_16 background; /* background color in screen gamma space */\r
+#if defined(PNG_READ_GAMMA_SUPPORTED)\r
+ png_color_16 background_1; /* background normalized to gamma 1.0 */\r
+#endif\r
+#endif /* PNG_bKGD_SUPPORTED */\r
+\r
+#if defined(PNG_WRITE_FLUSH_SUPPORTED)\r
+ png_flush_ptr output_flush_fn;/* Function for flushing output */\r
+ png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */\r
+ png_uint_32 flush_rows; /* number of rows written since last flush */\r
+#endif\r
+\r
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)\r
+ int gamma_shift; /* number of "insignificant" bits 16-bit gamma */\r
+#ifdef PNG_FLOATING_POINT_SUPPORTED\r
+ float gamma; /* file gamma value */\r
+ float screen_gamma; /* screen gamma value (display_exponent) */\r
+#endif\r
+#endif\r
+\r
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)\r
+ png_bytep gamma_table; /* gamma table for 8-bit depth files */\r
+ png_bytep gamma_from_1; /* converts from 1.0 to screen */\r
+ png_bytep gamma_to_1; /* converts from file to 1.0 */\r
+ png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */\r
+ png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */\r
+ png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */\r
+#endif\r
+\r
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)\r
+ png_color_8 sig_bit; /* significant bits in each available channel */\r
+#endif\r
+\r
+#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)\r
+ png_color_8 shift; /* shift for significant bit tranformation */\r
+#endif\r
+\r
+#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \\r
+ || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)\r
+ png_bytep trans; /* transparency values for paletted files */\r
+ png_color_16 trans_values; /* transparency values for non-paletted files */\r
+#endif\r
+\r
+ png_read_status_ptr read_row_fn; /* called after each row is decoded */\r
+ png_write_status_ptr write_row_fn; /* called after each row is encoded */\r
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED\r
+ png_progressive_info_ptr info_fn; /* called after header data fully read */\r
+ png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */\r
+ png_progressive_end_ptr end_fn; /* called after image is complete */\r
+ png_bytep save_buffer_ptr; /* current location in save_buffer */\r
+ png_bytep save_buffer; /* buffer for previously read data */\r
+ png_bytep current_buffer_ptr; /* current location in current_buffer */\r
+ png_bytep current_buffer; /* buffer for recently used data */\r
+ png_uint_32 push_length; /* size of current input chunk */\r
+ png_uint_32 skip_length; /* bytes to skip in input data */\r
+ png_size_t save_buffer_size; /* amount of data now in save_buffer */\r
+ png_size_t save_buffer_max; /* total size of save_buffer */\r
+ png_size_t buffer_size; /* total amount of available input data */\r
+ png_size_t current_buffer_size; /* amount of data now in current_buffer */\r
+ int process_mode; /* what push library is currently doing */\r
+ int cur_palette; /* current push library palette index */\r
+\r
+# if defined(PNG_TEXT_SUPPORTED)\r
+ png_size_t current_text_size; /* current size of text input data */\r
+ png_size_t current_text_left; /* how much text left to read in input */\r
+ png_charp current_text; /* current text chunk buffer */\r
+ png_charp current_text_ptr; /* current location in current_text */\r
+# endif /* PNG_TEXT_SUPPORTED */\r
+#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */\r
+\r
+#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)\r
+/* for the Borland special 64K segment handler */\r
+ png_bytepp offset_table_ptr;\r
+ png_bytep offset_table;\r
+ png_uint_16 offset_table_number;\r
+ png_uint_16 offset_table_count;\r
+ png_uint_16 offset_table_count_free;\r
+#endif\r
+\r
+#if defined(PNG_READ_DITHER_SUPPORTED)\r
+ png_bytep palette_lookup; /* lookup table for dithering */\r
+ png_bytep dither_index; /* index translation for palette files */\r
+#endif\r
+\r
+#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)\r
+ png_uint_16p hist; /* histogram */\r
+#endif\r
+\r
+#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)\r
+ png_byte heuristic_method; /* heuristic for row filter selection */\r
+ png_byte num_prev_filters; /* number of weights for previous rows */\r
+ png_bytep prev_filters; /* filter type(s) of previous row(s) */\r
+ png_uint_16p filter_weights; /* weight(s) for previous line(s) */\r
+ png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */\r
+ png_uint_16p filter_costs; /* relative filter calculation cost */\r
+ png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */\r
+#endif\r
+\r
+#if defined(PNG_TIME_RFC1123_SUPPORTED)\r
+ png_charp time_buffer; /* String to hold RFC 1123 time text */\r
+#endif\r
+\r
+/* New members added in libpng-1.0.6 */\r
+\r
+#ifdef PNG_FREE_ME_SUPPORTED\r
+ png_uint_32 free_me; /* flags items libpng is responsible for freeing */\r
+#endif\r
+\r
+#if defined(PNG_USER_CHUNKS_SUPPORTED)\r
+ png_voidp user_chunk_ptr;\r
+ png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */\r
+#endif\r
+\r
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)\r
+ int num_chunk_list;\r
+ png_bytep chunk_list;\r
+#endif\r
+\r
+/* New members added in libpng-1.0.3 */\r
+#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)\r
+ png_byte rgb_to_gray_status;\r
+ /* These were changed from png_byte in libpng-1.0.6 */\r
+ png_uint_16 rgb_to_gray_red_coeff;\r
+ png_uint_16 rgb_to_gray_green_coeff;\r
+ png_uint_16 rgb_to_gray_blue_coeff;\r
+#endif\r
+\r
+/* New member added in libpng-1.0.4 (renamed in 1.0.9) */\r
+#if defined(PNG_MNG_FEATURES_SUPPORTED) || \\r
+ defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \\r
+ defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)\r
+/* changed from png_byte to png_uint_32 at version 1.2.0 */\r
+#ifdef PNG_1_0_X\r
+ png_byte mng_features_permitted;\r
+#else\r
+ png_uint_32 mng_features_permitted;\r
+#endif /* PNG_1_0_X */\r
+#endif\r
+\r
+/* New member added in libpng-1.0.7 */\r
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)\r
+ png_fixed_point int_gamma;\r
+#endif\r
+\r
+/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */\r
+#if defined(PNG_MNG_FEATURES_SUPPORTED)\r
+ png_byte filter_type;\r
+#endif\r
+\r
+#if defined(PNG_1_0_X)\r
+/* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */\r
+ png_uint_32 row_buf_size;\r
+#endif\r
+\r
+/* New members added in libpng-1.2.0 */\r
+#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)\r
+# if !defined(PNG_1_0_X)\r
+# if defined(PNG_MMX_CODE_SUPPORTED)\r
+ png_byte mmx_bitdepth_threshold;\r
+ png_uint_32 mmx_rowbytes_threshold;\r
+# endif\r
+ png_uint_32 asm_flags;\r
+# endif\r
+#endif\r
+\r
+/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ png_voidp mem_ptr; /* user supplied struct for mem functions */\r
+ png_malloc_ptr malloc_fn; /* function for allocating memory */\r
+ png_free_ptr free_fn; /* function for freeing memory */\r
+#endif\r
+\r
+/* New member added in libpng-1.0.13 and 1.2.0 */\r
+ png_bytep big_row_buf; /* buffer to save current (unfiltered) row */\r
+\r
+#if defined(PNG_READ_DITHER_SUPPORTED)\r
+/* The following three members were added at version 1.0.14 and 1.2.4 */\r
+ png_bytep dither_sort; /* working sort array */\r
+ png_bytep index_to_palette; /* where the original index currently is */\r
+ /* in the palette */\r
+ png_bytep palette_to_index; /* which original index points to this */\r
+ /* palette color */\r
+#endif\r
+\r
+/* New members added in libpng-1.0.16 and 1.2.6 */\r
+ png_byte compression_type;\r
+\r
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED\r
+ png_uint_32 user_width_max;\r
+ png_uint_32 user_height_max;\r
+#endif\r
+\r
+/* New member added in libpng-1.0.25 and 1.2.17 */\r
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)\r
+ /* storage for unknown chunk that the library doesn't recognize. */\r
+ png_unknown_chunk unknown_chunk;\r
+#endif\r
+\r
+/* New members added in libpng-1.2.26 */\r
+ png_uint_32 old_big_row_buf_size, old_prev_row_size;\r
+\r
+/* New member added in libpng-1.2.30 */\r
+ png_charp chunkdata; /* buffer for reading chunk data */\r
+\r
+};\r
+\r
+\r
+/* This triggers a compiler error in png.c, if png.c and png.h\r
+ * do not agree upon the version number.\r
+ */\r
+typedef png_structp version_1_2_33;\r
+\r
+typedef png_struct FAR * FAR * png_structpp;\r
+\r
+/* Here are the function definitions most commonly used. This is not\r
+ * the place to find out how to use libpng. See libpng.txt for the\r
+ * full explanation, see example.c for the summary. This just provides\r
+ * a simple one line description of the use of each function.\r
+ */\r
+\r
+/* Returns the version number of the library */\r
+extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));\r
+\r
+/* Tell lib we have already handled the first <num_bytes> magic bytes.\r
+ * Handling more than 8 bytes from the beginning of the file is an error.\r
+ */\r
+extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,\r
+ int num_bytes));\r
+\r
+/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a\r
+ * PNG file. Returns zero if the supplied bytes match the 8-byte PNG\r
+ * signature, and non-zero otherwise. Having num_to_check == 0 or\r
+ * start > 7 will always fail (ie return non-zero).\r
+ */\r
+extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,\r
+ png_size_t num_to_check));\r
+\r
+/* Simple signature checking function. This is the same as calling\r
+ * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).\r
+ */\r
+extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));\r
+\r
+/* Allocate and initialize png_ptr struct for reading, and any other memory. */\r
+extern PNG_EXPORT(png_structp,png_create_read_struct)\r
+ PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,\r
+ png_error_ptr error_fn, png_error_ptr warn_fn));\r
+\r
+/* Allocate and initialize png_ptr struct for writing, and any other memory */\r
+extern PNG_EXPORT(png_structp,png_create_write_struct)\r
+ PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,\r
+ png_error_ptr error_fn, png_error_ptr warn_fn));\r
+\r
+#ifdef PNG_WRITE_SUPPORTED\r
+extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)\r
+ PNGARG((png_structp png_ptr));\r
+#endif\r
+\r
+#ifdef PNG_WRITE_SUPPORTED\r
+extern PNG_EXPORT(void,png_set_compression_buffer_size)\r
+ PNGARG((png_structp png_ptr, png_uint_32 size));\r
+#endif\r
+\r
+/* Reset the compression stream */\r
+extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));\r
+\r
+/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+extern PNG_EXPORT(png_structp,png_create_read_struct_2)\r
+ PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,\r
+ png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,\r
+ png_malloc_ptr malloc_fn, png_free_ptr free_fn));\r
+extern PNG_EXPORT(png_structp,png_create_write_struct_2)\r
+ PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,\r
+ png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,\r
+ png_malloc_ptr malloc_fn, png_free_ptr free_fn));\r
+#endif\r
+\r
+/* Write a PNG chunk - size, type, (optional) data, CRC. */\r
+extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,\r
+ png_bytep chunk_name, png_bytep data, png_size_t length));\r
+\r
+/* Write the start of a PNG chunk - length and chunk name. */\r
+extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,\r
+ png_bytep chunk_name, png_uint_32 length));\r
+\r
+/* Write the data of a PNG chunk started with png_write_chunk_start(). */\r
+extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,\r
+ png_bytep data, png_size_t length));\r
+\r
+/* Finish a chunk started with png_write_chunk_start() (includes CRC). */\r
+extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));\r
+\r
+/* Allocate and initialize the info structure */\r
+extern PNG_EXPORT(png_infop,png_create_info_struct)\r
+ PNGARG((png_structp png_ptr));\r
+\r
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)\r
+/* Initialize the info structure (old interface - DEPRECATED) */\r
+extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));\r
+#undef png_info_init\r
+#define png_info_init(info_ptr) png_info_init_3(&info_ptr,\\r
+ png_sizeof(png_info));\r
+#endif\r
+\r
+extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,\r
+ png_size_t png_info_struct_size));\r
+\r
+/* Writes all the PNG information before the image. */\r
+extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr));\r
+extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr));\r
+\r
+#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED\r
+/* read the information before the actual image data. */\r
+extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr));\r
+#endif\r
+\r
+#if defined(PNG_TIME_RFC1123_SUPPORTED)\r
+extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)\r
+ PNGARG((png_structp png_ptr, png_timep ptime));\r
+#endif\r
+\r
+#if !defined(_WIN32_WCE)\r
+/* "time.h" functions are not supported on WindowsCE */\r
+#if defined(PNG_WRITE_tIME_SUPPORTED)\r
+/* convert from a struct tm to png_time */\r
+extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,\r
+ struct tm FAR * ttime));\r
+\r
+/* convert from time_t to png_time. Uses gmtime() */\r
+extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,\r
+ time_t ttime));\r
+#endif /* PNG_WRITE_tIME_SUPPORTED */\r
+#endif /* _WIN32_WCE */\r
+\r
+#if defined(PNG_READ_EXPAND_SUPPORTED)\r
+/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */\r
+extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));\r
+#if !defined(PNG_1_0_X)\r
+extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp\r
+ png_ptr));\r
+#endif\r
+extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));\r
+extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));\r
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)\r
+/* Deprecated */\r
+extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));\r
+#endif\r
+#endif\r
+\r
+#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)\r
+/* Use blue, green, red order for pixels. */\r
+extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));\r
+#endif\r
+\r
+#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)\r
+/* Expand the grayscale to 24-bit RGB if necessary. */\r
+extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));\r
+#endif\r
+\r
+#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)\r
+/* Reduce RGB to grayscale. */\r
+#ifdef PNG_FLOATING_POINT_SUPPORTED\r
+extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,\r
+ int error_action, double red, double green ));\r
+#endif\r
+extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,\r
+ int error_action, png_fixed_point red, png_fixed_point green ));\r
+extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp\r
+ png_ptr));\r
+#endif\r
+\r
+extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,\r
+ png_colorp palette));\r
+\r
+#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)\r
+extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));\r
+#endif\r
+\r
+#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \\r
+ defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)\r
+extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));\r
+#endif\r
+\r
+#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \\r
+ defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)\r
+extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));\r
+#endif\r
+\r
+#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)\r
+/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */\r
+extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,\r
+ png_uint_32 filler, int flags));\r
+/* The values of the PNG_FILLER_ defines should NOT be changed */\r
+#define PNG_FILLER_BEFORE 0\r
+#define PNG_FILLER_AFTER 1\r
+/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */\r
+#if !defined(PNG_1_0_X)\r
+extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,\r
+ png_uint_32 filler, int flags));\r
+#endif\r
+#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */\r
+\r
+#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)\r
+/* Swap bytes in 16-bit depth files. */\r
+extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));\r
+#endif\r
+\r
+#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)\r
+/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */\r
+extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));\r
+#endif\r
+\r
+#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)\r
+/* Swap packing order of pixels in bytes. */\r
+extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));\r
+#endif\r
+\r
+#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)\r
+/* Converts files to legal bit depths. */\r
+extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,\r
+ png_color_8p true_bits));\r
+#endif\r
+\r
+#if defined(PNG_READ_INTERLACING_SUPPORTED) || \\r
+ defined(PNG_WRITE_INTERLACING_SUPPORTED)\r
+/* Have the code handle the interlacing. Returns the number of passes. */\r
+extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));\r
+#endif\r
+\r
+#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)\r
+/* Invert monochrome files */\r
+extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));\r
+#endif\r
+\r
+#if defined(PNG_READ_BACKGROUND_SUPPORTED)\r
+/* Handle alpha and tRNS by replacing with a background color. */\r
+#ifdef PNG_FLOATING_POINT_SUPPORTED\r
+extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,\r
+ png_color_16p background_color, int background_gamma_code,\r
+ int need_expand, double background_gamma));\r
+#endif\r
+#define PNG_BACKGROUND_GAMMA_UNKNOWN 0\r
+#define PNG_BACKGROUND_GAMMA_SCREEN 1\r
+#define PNG_BACKGROUND_GAMMA_FILE 2\r
+#define PNG_BACKGROUND_GAMMA_UNIQUE 3\r
+#endif\r
+\r
+#if defined(PNG_READ_16_TO_8_SUPPORTED)\r
+/* strip the second byte of information from a 16-bit depth file. */\r
+extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));\r
+#endif\r
+\r
+#if defined(PNG_READ_DITHER_SUPPORTED)\r
+/* Turn on dithering, and reduce the palette to the number of colors available. */\r
+extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,\r
+ png_colorp palette, int num_palette, int maximum_colors,\r
+ png_uint_16p histogram, int full_dither));\r
+#endif\r
+\r
+#if defined(PNG_READ_GAMMA_SUPPORTED)\r
+/* Handle gamma correction. Screen_gamma=(display_exponent) */\r
+#ifdef PNG_FLOATING_POINT_SUPPORTED\r
+extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,\r
+ double screen_gamma, double default_file_gamma));\r
+#endif\r
+#endif\r
+\r
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)\r
+#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \\r
+ defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)\r
+/* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */\r
+/* Deprecated and will be removed. Use png_permit_mng_features() instead. */\r
+extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,\r
+ int empty_plte_permitted));\r
+#endif\r
+#endif\r
+\r
+#if defined(PNG_WRITE_FLUSH_SUPPORTED)\r
+/* Set how many lines between output flushes - 0 for no flushing */\r
+extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));\r
+/* Flush the current PNG output buffer */\r
+extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));\r
+#endif\r
+\r
+/* optional update palette with requested transformations */\r
+extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));\r
+\r
+/* optional call to update the users info structure */\r
+extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr));\r
+\r
+#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED\r
+/* read one or more rows of image data. */\r
+extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,\r
+ png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));\r
+#endif\r
+\r
+#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED\r
+/* read a row of data. */\r
+extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,\r
+ png_bytep row,\r
+ png_bytep display_row));\r
+#endif\r
+\r
+#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED\r
+/* read the whole image into memory at once. */\r
+extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,\r
+ png_bytepp image));\r
+#endif\r
+\r
+/* write a row of image data */\r
+extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,\r
+ png_bytep row));\r
+\r
+/* write a few rows of image data */\r
+extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,\r
+ png_bytepp row, png_uint_32 num_rows));\r
+\r
+/* write the image data */\r
+extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,\r
+ png_bytepp image));\r
+\r
+/* writes the end of the PNG file. */\r
+extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr));\r
+\r
+#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED\r
+/* read the end of the PNG file. */\r
+extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr));\r
+#endif\r
+\r
+/* free any memory associated with the png_info_struct */\r
+extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,\r
+ png_infopp info_ptr_ptr));\r
+\r
+/* free any memory associated with the png_struct and the png_info_structs */\r
+extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp\r
+ png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));\r
+\r
+/* free all memory used by the read (old method - NOT DLL EXPORTED) */\r
+extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_infop end_info_ptr));\r
+\r
+/* free any memory associated with the png_struct and the png_info_structs */\r
+extern PNG_EXPORT(void,png_destroy_write_struct)\r
+ PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));\r
+\r
+/* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */\r
+extern void png_write_destroy PNGARG((png_structp png_ptr));\r
+\r
+/* set the libpng method of handling chunk CRC errors */\r
+extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,\r
+ int crit_action, int ancil_action));\r
+\r
+/* Values for png_set_crc_action() to say how to handle CRC errors in\r
+ * ancillary and critical chunks, and whether to use the data contained\r
+ * therein. Note that it is impossible to "discard" data in a critical\r
+ * chunk. For versions prior to 0.90, the action was always error/quit,\r
+ * whereas in version 0.90 and later, the action for CRC errors in ancillary\r
+ * chunks is warn/discard. These values should NOT be changed.\r
+ *\r
+ * value action:critical action:ancillary\r
+ */\r
+#define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */\r
+#define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */\r
+#define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */\r
+#define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */\r
+#define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */\r
+#define PNG_CRC_NO_CHANGE 5 /* use current value use current value */\r
+\r
+/* These functions give the user control over the scan-line filtering in\r
+ * libpng and the compression methods used by zlib. These functions are\r
+ * mainly useful for testing, as the defaults should work with most users.\r
+ * Those users who are tight on memory or want faster performance at the\r
+ * expense of compression can modify them. See the compression library\r
+ * header file (zlib.h) for an explination of the compression functions.\r
+ */\r
+\r
+/* set the filtering method(s) used by libpng. Currently, the only valid\r
+ * value for "method" is 0.\r
+ */\r
+extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,\r
+ int filters));\r
+\r
+/* Flags for png_set_filter() to say which filters to use. The flags\r
+ * are chosen so that they don't conflict with real filter types\r
+ * below, in case they are supplied instead of the #defined constants.\r
+ * These values should NOT be changed.\r
+ */\r
+#define PNG_NO_FILTERS 0x00\r
+#define PNG_FILTER_NONE 0x08\r
+#define PNG_FILTER_SUB 0x10\r
+#define PNG_FILTER_UP 0x20\r
+#define PNG_FILTER_AVG 0x40\r
+#define PNG_FILTER_PAETH 0x80\r
+#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \\r
+ PNG_FILTER_AVG | PNG_FILTER_PAETH)\r
+\r
+/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.\r
+ * These defines should NOT be changed.\r
+ */\r
+#define PNG_FILTER_VALUE_NONE 0\r
+#define PNG_FILTER_VALUE_SUB 1\r
+#define PNG_FILTER_VALUE_UP 2\r
+#define PNG_FILTER_VALUE_AVG 3\r
+#define PNG_FILTER_VALUE_PAETH 4\r
+#define PNG_FILTER_VALUE_LAST 5\r
+\r
+#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */\r
+/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_\r
+ * defines, either the default (minimum-sum-of-absolute-differences), or\r
+ * the experimental method (weighted-minimum-sum-of-absolute-differences).\r
+ *\r
+ * Weights are factors >= 1.0, indicating how important it is to keep the\r
+ * filter type consistent between rows. Larger numbers mean the current\r
+ * filter is that many times as likely to be the same as the "num_weights"\r
+ * previous filters. This is cumulative for each previous row with a weight.\r
+ * There needs to be "num_weights" values in "filter_weights", or it can be\r
+ * NULL if the weights aren't being specified. Weights have no influence on\r
+ * the selection of the first row filter. Well chosen weights can (in theory)\r
+ * improve the compression for a given image.\r
+ *\r
+ * Costs are factors >= 1.0 indicating the relative decoding costs of a\r
+ * filter type. Higher costs indicate more decoding expense, and are\r
+ * therefore less likely to be selected over a filter with lower computational\r
+ * costs. There needs to be a value in "filter_costs" for each valid filter\r
+ * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't\r
+ * setting the costs. Costs try to improve the speed of decompression without\r
+ * unduly increasing the compressed image size.\r
+ *\r
+ * A negative weight or cost indicates the default value is to be used, and\r
+ * values in the range [0.0, 1.0) indicate the value is to remain unchanged.\r
+ * The default values for both weights and costs are currently 1.0, but may\r
+ * change if good general weighting/cost heuristics can be found. If both\r
+ * the weights and costs are set to 1.0, this degenerates the WEIGHTED method\r
+ * to the UNWEIGHTED method, but with added encoding time/computation.\r
+ */\r
+#ifdef PNG_FLOATING_POINT_SUPPORTED\r
+extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,\r
+ int heuristic_method, int num_weights, png_doublep filter_weights,\r
+ png_doublep filter_costs));\r
+#endif\r
+#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */\r
+\r
+/* Heuristic used for row filter selection. These defines should NOT be\r
+ * changed.\r
+ */\r
+#define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */\r
+#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */\r
+#define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */\r
+#define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */\r
+\r
+/* Set the library compression level. Currently, valid values range from\r
+ * 0 - 9, corresponding directly to the zlib compression levels 0 - 9\r
+ * (0 - no compression, 9 - "maximal" compression). Note that tests have\r
+ * shown that zlib compression levels 3-6 usually perform as well as level 9\r
+ * for PNG images, and do considerably fewer caclulations. In the future,\r
+ * these values may not correspond directly to the zlib compression levels.\r
+ */\r
+extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,\r
+ int level));\r
+\r
+extern PNG_EXPORT(void,png_set_compression_mem_level)\r
+ PNGARG((png_structp png_ptr, int mem_level));\r
+\r
+extern PNG_EXPORT(void,png_set_compression_strategy)\r
+ PNGARG((png_structp png_ptr, int strategy));\r
+\r
+extern PNG_EXPORT(void,png_set_compression_window_bits)\r
+ PNGARG((png_structp png_ptr, int window_bits));\r
+\r
+extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,\r
+ int method));\r
+\r
+/* These next functions are called for input/output, memory, and error\r
+ * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,\r
+ * and call standard C I/O routines such as fread(), fwrite(), and\r
+ * fprintf(). These functions can be made to use other I/O routines\r
+ * at run time for those applications that need to handle I/O in a\r
+ * different manner by calling png_set_???_fn(). See libpng.txt for\r
+ * more information.\r
+ */\r
+\r
+#if !defined(PNG_NO_STDIO)\r
+/* Initialize the input/output for the PNG file to the default functions. */\r
+extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));\r
+#endif\r
+\r
+/* Replace the (error and abort), and warning functions with user\r
+ * supplied functions. If no messages are to be printed you must still\r
+ * write and use replacement functions. The replacement error_fn should\r
+ * still do a longjmp to the last setjmp location if you are using this\r
+ * method of error handling. If error_fn or warning_fn is NULL, the\r
+ * default function will be used.\r
+ */\r
+\r
+extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,\r
+ png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));\r
+\r
+/* Return the user pointer associated with the error functions */\r
+extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));\r
+\r
+/* Replace the default data output functions with a user supplied one(s).\r
+ * If buffered output is not used, then output_flush_fn can be set to NULL.\r
+ * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time\r
+ * output_flush_fn will be ignored (and thus can be NULL).\r
+ */\r
+extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,\r
+ png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));\r
+\r
+/* Replace the default data input function with a user supplied one. */\r
+extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,\r
+ png_voidp io_ptr, png_rw_ptr read_data_fn));\r
+\r
+/* Return the user pointer associated with the I/O functions */\r
+extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));\r
+\r
+extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,\r
+ png_read_status_ptr read_row_fn));\r
+\r
+extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,\r
+ png_write_status_ptr write_row_fn));\r
+\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+/* Replace the default memory allocation functions with user supplied one(s). */\r
+extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,\r
+ png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));\r
+/* Return the user pointer associated with the memory functions */\r
+extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));\r
+#endif\r
+\r
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \\r
+ defined(PNG_LEGACY_SUPPORTED)\r
+extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp\r
+ png_ptr, png_user_transform_ptr read_user_transform_fn));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \\r
+ defined(PNG_LEGACY_SUPPORTED)\r
+extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp\r
+ png_ptr, png_user_transform_ptr write_user_transform_fn));\r
+#endif\r
+\r
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \\r
+ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \\r
+ defined(PNG_LEGACY_SUPPORTED)\r
+extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp\r
+ png_ptr, png_voidp user_transform_ptr, int user_transform_depth,\r
+ int user_transform_channels));\r
+/* Return the user pointer associated with the user transform functions */\r
+extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)\r
+ PNGARG((png_structp png_ptr));\r
+#endif\r
+\r
+#ifdef PNG_USER_CHUNKS_SUPPORTED\r
+extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,\r
+ png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));\r
+extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp\r
+ png_ptr));\r
+#endif\r
+\r
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED\r
+/* Sets the function callbacks for the push reader, and a pointer to a\r
+ * user-defined structure available to the callback functions.\r
+ */\r
+extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,\r
+ png_voidp progressive_ptr,\r
+ png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,\r
+ png_progressive_end_ptr end_fn));\r
+\r
+/* returns the user pointer associated with the push read functions */\r
+extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)\r
+ PNGARG((png_structp png_ptr));\r
+\r
+/* function to be called when data becomes available */\r
+extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));\r
+\r
+/* function that combines rows. Not very much different than the\r
+ * png_combine_row() call. Is this even used?????\r
+ */\r
+extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,\r
+ png_bytep old_row, png_bytep new_row));\r
+#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */\r
+\r
+extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,\r
+ png_uint_32 size));\r
+\r
+#if defined(PNG_1_0_X)\r
+# define png_malloc_warn png_malloc\r
+#else\r
+/* Added at libpng version 1.2.4 */\r
+extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,\r
+ png_uint_32 size));\r
+#endif\r
+\r
+/* frees a pointer allocated by png_malloc() */\r
+extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));\r
+\r
+#if defined(PNG_1_0_X)\r
+/* Function to allocate memory for zlib. */\r
+extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,\r
+ uInt size));\r
+\r
+/* Function to free memory for zlib */\r
+extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));\r
+#endif\r
+\r
+/* Free data that was allocated internally */\r
+extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_uint_32 free_me, int num));\r
+#ifdef PNG_FREE_ME_SUPPORTED\r
+/* Reassign responsibility for freeing existing data, whether allocated\r
+ * by libpng or by the application */\r
+extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, int freer, png_uint_32 mask));\r
+#endif\r
+/* assignments for png_data_freer */\r
+#define PNG_DESTROY_WILL_FREE_DATA 1\r
+#define PNG_SET_WILL_FREE_DATA 1\r
+#define PNG_USER_WILL_FREE_DATA 2\r
+/* Flags for png_ptr->free_me and info_ptr->free_me */\r
+#define PNG_FREE_HIST 0x0008\r
+#define PNG_FREE_ICCP 0x0010\r
+#define PNG_FREE_SPLT 0x0020\r
+#define PNG_FREE_ROWS 0x0040\r
+#define PNG_FREE_PCAL 0x0080\r
+#define PNG_FREE_SCAL 0x0100\r
+#define PNG_FREE_UNKN 0x0200\r
+#define PNG_FREE_LIST 0x0400\r
+#define PNG_FREE_PLTE 0x1000\r
+#define PNG_FREE_TRNS 0x2000\r
+#define PNG_FREE_TEXT 0x4000\r
+#define PNG_FREE_ALL 0x7fff\r
+#define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */\r
+\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,\r
+ png_uint_32 size));\r
+extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,\r
+ png_voidp ptr));\r
+#endif\r
+\r
+extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,\r
+ png_voidp s1, png_voidp s2, png_uint_32 size));\r
+\r
+extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,\r
+ png_voidp s1, int value, png_uint_32 size));\r
+\r
+#if defined(USE_FAR_KEYWORD) /* memory model conversion function */\r
+extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,\r
+ int check));\r
+#endif /* USE_FAR_KEYWORD */\r
+\r
+#ifndef PNG_NO_ERROR_TEXT\r
+/* Fatal error in PNG image of libpng - can't continue */\r
+extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,\r
+ png_const_charp error_message));\r
+\r
+/* The same, but the chunk name is prepended to the error string. */\r
+extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,\r
+ png_const_charp error_message));\r
+#else\r
+/* Fatal error in PNG image of libpng - can't continue */\r
+extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr));\r
+#endif\r
+\r
+#ifndef PNG_NO_WARNINGS\r
+/* Non-fatal error in libpng. Can continue, but may have a problem. */\r
+extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,\r
+ png_const_charp warning_message));\r
+\r
+#ifdef PNG_READ_SUPPORTED\r
+/* Non-fatal error in libpng, chunk name is prepended to message. */\r
+extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,\r
+ png_const_charp warning_message));\r
+#endif /* PNG_READ_SUPPORTED */\r
+#endif /* PNG_NO_WARNINGS */\r
+\r
+/* The png_set_<chunk> functions are for storing values in the png_info_struct.\r
+ * Similarly, the png_get_<chunk> calls are used to read values from the\r
+ * png_info_struct, either storing the parameters in the passed variables, or\r
+ * setting pointers into the png_info_struct where the data is stored. The\r
+ * png_get_<chunk> functions return a non-zero value if the data was available\r
+ * in info_ptr, or return zero and do not change any of the parameters if the\r
+ * data was not available.\r
+ *\r
+ * These functions should be used instead of directly accessing png_info\r
+ * to avoid problems with future changes in the size and internal layout of\r
+ * png_info_struct.\r
+ */\r
+/* Returns "flag" if chunk data is valid in info_ptr. */\r
+extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,\r
+png_infop info_ptr, png_uint_32 flag));\r
+\r
+/* Returns number of bytes needed to hold a transformed row. */\r
+extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,\r
+png_infop info_ptr));\r
+\r
+#if defined(PNG_INFO_IMAGE_SUPPORTED)\r
+/* Returns row_pointers, which is an array of pointers to scanlines that was\r
+returned from png_read_png(). */\r
+extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,\r
+png_infop info_ptr));\r
+/* Set row_pointers, which is an array of pointers to scanlines for use\r
+by png_write_png(). */\r
+extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_bytepp row_pointers));\r
+#endif\r
+\r
+/* Returns number of color channels in image. */\r
+extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,\r
+png_infop info_ptr));\r
+\r
+#ifdef PNG_EASY_ACCESS_SUPPORTED\r
+/* Returns image width in pixels. */\r
+extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp\r
+png_ptr, png_infop info_ptr));\r
+\r
+/* Returns image height in pixels. */\r
+extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp\r
+png_ptr, png_infop info_ptr));\r
+\r
+/* Returns image bit_depth. */\r
+extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp\r
+png_ptr, png_infop info_ptr));\r
+\r
+/* Returns image color_type. */\r
+extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp\r
+png_ptr, png_infop info_ptr));\r
+\r
+/* Returns image filter_type. */\r
+extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp\r
+png_ptr, png_infop info_ptr));\r
+\r
+/* Returns image interlace_type. */\r
+extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp\r
+png_ptr, png_infop info_ptr));\r
+\r
+/* Returns image compression_type. */\r
+extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp\r
+png_ptr, png_infop info_ptr));\r
+\r
+/* Returns image resolution in pixels per meter, from pHYs chunk data. */\r
+extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp\r
+png_ptr, png_infop info_ptr));\r
+extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp\r
+png_ptr, png_infop info_ptr));\r
+extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp\r
+png_ptr, png_infop info_ptr));\r
+\r
+/* Returns pixel aspect ratio, computed from pHYs chunk data. */\r
+#ifdef PNG_FLOATING_POINT_SUPPORTED\r
+extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp\r
+png_ptr, png_infop info_ptr));\r
+#endif\r
+\r
+/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */\r
+extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp\r
+png_ptr, png_infop info_ptr));\r
+extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp\r
+png_ptr, png_infop info_ptr));\r
+extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp\r
+png_ptr, png_infop info_ptr));\r
+extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp\r
+png_ptr, png_infop info_ptr));\r
+\r
+#endif /* PNG_EASY_ACCESS_SUPPORTED */\r
+\r
+/* Returns pointer to signature string read from PNG header */\r
+extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,\r
+png_infop info_ptr));\r
+\r
+#if defined(PNG_bKGD_SUPPORTED)\r
+extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_color_16p *background));\r
+#endif\r
+\r
+#if defined(PNG_bKGD_SUPPORTED)\r
+extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_color_16p background));\r
+#endif\r
+\r
+#if defined(PNG_cHRM_SUPPORTED)\r
+#ifdef PNG_FLOATING_POINT_SUPPORTED\r
+extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, double *white_x, double *white_y, double *red_x,\r
+ double *red_y, double *green_x, double *green_y, double *blue_x,\r
+ double *blue_y));\r
+#endif\r
+#ifdef PNG_FIXED_POINT_SUPPORTED\r
+extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point\r
+ *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,\r
+ png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point\r
+ *int_blue_x, png_fixed_point *int_blue_y));\r
+#endif\r
+#endif\r
+\r
+#if defined(PNG_cHRM_SUPPORTED)\r
+#ifdef PNG_FLOATING_POINT_SUPPORTED\r
+extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, double white_x, double white_y, double red_x,\r
+ double red_y, double green_x, double green_y, double blue_x, double blue_y));\r
+#endif\r
+#ifdef PNG_FIXED_POINT_SUPPORTED\r
+extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,\r
+ png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point\r
+ int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,\r
+ png_fixed_point int_blue_y));\r
+#endif\r
+#endif\r
+\r
+#if defined(PNG_gAMA_SUPPORTED)\r
+#ifdef PNG_FLOATING_POINT_SUPPORTED\r
+extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, double *file_gamma));\r
+#endif\r
+extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_fixed_point *int_file_gamma));\r
+#endif\r
+\r
+#if defined(PNG_gAMA_SUPPORTED)\r
+#ifdef PNG_FLOATING_POINT_SUPPORTED\r
+extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, double file_gamma));\r
+#endif\r
+extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_fixed_point int_file_gamma));\r
+#endif\r
+\r
+#if defined(PNG_hIST_SUPPORTED)\r
+extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_uint_16p *hist));\r
+#endif\r
+\r
+#if defined(PNG_hIST_SUPPORTED)\r
+extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_uint_16p hist));\r
+#endif\r
+\r
+extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,\r
+ int *bit_depth, int *color_type, int *interlace_method,\r
+ int *compression_method, int *filter_method));\r
+\r
+extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,\r
+ int color_type, int interlace_method, int compression_method,\r
+ int filter_method));\r
+\r
+#if defined(PNG_oFFs_SUPPORTED)\r
+extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,\r
+ int *unit_type));\r
+#endif\r
+\r
+#if defined(PNG_oFFs_SUPPORTED)\r
+extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,\r
+ int unit_type));\r
+#endif\r
+\r
+#if defined(PNG_pCAL_SUPPORTED)\r
+extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,\r
+ int *type, int *nparams, png_charp *units, png_charpp *params));\r
+#endif\r
+\r
+#if defined(PNG_pCAL_SUPPORTED)\r
+extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,\r
+ int type, int nparams, png_charp units, png_charpp params));\r
+#endif\r
+\r
+#if defined(PNG_pHYs_SUPPORTED)\r
+extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));\r
+#endif\r
+\r
+#if defined(PNG_pHYs_SUPPORTED)\r
+extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));\r
+#endif\r
+\r
+extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_colorp *palette, int *num_palette));\r
+\r
+extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_colorp palette, int num_palette));\r
+\r
+#if defined(PNG_sBIT_SUPPORTED)\r
+extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_color_8p *sig_bit));\r
+#endif\r
+\r
+#if defined(PNG_sBIT_SUPPORTED)\r
+extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_color_8p sig_bit));\r
+#endif\r
+\r
+#if defined(PNG_sRGB_SUPPORTED)\r
+extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, int *intent));\r
+#endif\r
+\r
+#if defined(PNG_sRGB_SUPPORTED)\r
+extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, int intent));\r
+extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, int intent));\r
+#endif\r
+\r
+#if defined(PNG_iCCP_SUPPORTED)\r
+extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_charpp name, int *compression_type,\r
+ png_charpp profile, png_uint_32 *proflen));\r
+ /* Note to maintainer: profile should be png_bytepp */\r
+#endif\r
+\r
+#if defined(PNG_iCCP_SUPPORTED)\r
+extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_charp name, int compression_type,\r
+ png_charp profile, png_uint_32 proflen));\r
+ /* Note to maintainer: profile should be png_bytep */\r
+#endif\r
+\r
+#if defined(PNG_sPLT_SUPPORTED)\r
+extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_sPLT_tpp entries));\r
+#endif\r
+\r
+#if defined(PNG_sPLT_SUPPORTED)\r
+extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_sPLT_tp entries, int nentries));\r
+#endif\r
+\r
+#if defined(PNG_TEXT_SUPPORTED)\r
+/* png_get_text also returns the number of text chunks in *num_text */\r
+extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_textp *text_ptr, int *num_text));\r
+#endif\r
+\r
+/*\r
+ * Note while png_set_text() will accept a structure whose text,\r
+ * language, and translated keywords are NULL pointers, the structure\r
+ * returned by png_get_text will always contain regular\r
+ * zero-terminated C strings. They might be empty strings but\r
+ * they will never be NULL pointers.\r
+ */\r
+\r
+#if defined(PNG_TEXT_SUPPORTED)\r
+extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_textp text_ptr, int num_text));\r
+#endif\r
+\r
+#if defined(PNG_tIME_SUPPORTED)\r
+extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_timep *mod_time));\r
+#endif\r
+\r
+#if defined(PNG_tIME_SUPPORTED)\r
+extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_timep mod_time));\r
+#endif\r
+\r
+#if defined(PNG_tRNS_SUPPORTED)\r
+extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_bytep *trans, int *num_trans,\r
+ png_color_16p *trans_values));\r
+#endif\r
+\r
+#if defined(PNG_tRNS_SUPPORTED)\r
+extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_bytep trans, int num_trans,\r
+ png_color_16p trans_values));\r
+#endif\r
+\r
+#if defined(PNG_tRNS_SUPPORTED)\r
+#endif\r
+\r
+#if defined(PNG_sCAL_SUPPORTED)\r
+#ifdef PNG_FLOATING_POINT_SUPPORTED\r
+extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, int *unit, double *width, double *height));\r
+#else\r
+#ifdef PNG_FIXED_POINT_SUPPORTED\r
+extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));\r
+#endif\r
+#endif\r
+#endif /* PNG_sCAL_SUPPORTED */\r
+\r
+#if defined(PNG_sCAL_SUPPORTED)\r
+#ifdef PNG_FLOATING_POINT_SUPPORTED\r
+extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, int unit, double width, double height));\r
+#else\r
+#ifdef PNG_FIXED_POINT_SUPPORTED\r
+extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));\r
+#endif\r
+#endif\r
+#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */\r
+\r
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)\r
+/* provide a list of chunks and how they are to be handled, if the built-in\r
+ handling or default unknown chunk handling is not desired. Any chunks not\r
+ listed will be handled in the default manner. The IHDR and IEND chunks\r
+ must not be listed.\r
+ keep = 0: follow default behaviour\r
+ = 1: do not keep\r
+ = 2: keep only if safe-to-copy\r
+ = 3: keep even if unsafe-to-copy\r
+*/\r
+extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp\r
+ png_ptr, int keep, png_bytep chunk_list, int num_chunks));\r
+extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));\r
+extern PNG_EXPORT(void, png_set_unknown_chunk_location)\r
+ PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));\r
+extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp\r
+ png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));\r
+#endif\r
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED\r
+PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep\r
+ chunk_name));\r
+#endif\r
+\r
+/* Png_free_data() will turn off the "valid" flag for anything it frees.\r
+ If you need to turn it off for a chunk that your application has freed,\r
+ you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */\r
+extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, int mask));\r
+\r
+#if defined(PNG_INFO_IMAGE_SUPPORTED)\r
+/* The "params" pointer is currently not used and is for future expansion. */\r
+extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr,\r
+ int transforms,\r
+ png_voidp params));\r
+extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr,\r
+ int transforms,\r
+ png_voidp params));\r
+#endif\r
+\r
+/* Define PNG_DEBUG at compile time for debugging information. Higher\r
+ * numbers for PNG_DEBUG mean more debugging information. This has\r
+ * only been added since version 0.95 so it is not implemented throughout\r
+ * libpng yet, but more support will be added as needed.\r
+ */\r
+#ifdef PNG_DEBUG\r
+#if (PNG_DEBUG > 0)\r
+#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)\r
+#include <crtdbg.h>\r
+#if (PNG_DEBUG > 1)\r
+#define png_debug(l,m) _RPT0(_CRT_WARN,m)\r
+#define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m,p1)\r
+#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2)\r
+#endif\r
+#else /* PNG_DEBUG_FILE || !_MSC_VER */\r
+#ifndef PNG_DEBUG_FILE\r
+#define PNG_DEBUG_FILE stderr\r
+#endif /* PNG_DEBUG_FILE */\r
+#if (PNG_DEBUG > 1)\r
+#define png_debug(l,m) \\r
+{ \\r
+ int num_tabs=l; \\r
+ fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \\r
+ (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \\r
+}\r
+#define png_debug1(l,m,p1) \\r
+{ \\r
+ int num_tabs=l; \\r
+ fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \\r
+ (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \\r
+}\r
+#define png_debug2(l,m,p1,p2) \\r
+{ \\r
+ int num_tabs=l; \\r
+ fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \\r
+ (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \\r
+}\r
+#endif /* (PNG_DEBUG > 1) */\r
+#endif /* _MSC_VER */\r
+#endif /* (PNG_DEBUG > 0) */\r
+#endif /* PNG_DEBUG */\r
+#ifndef png_debug\r
+#define png_debug(l, m)\r
+#endif\r
+#ifndef png_debug1\r
+#define png_debug1(l, m, p1)\r
+#endif\r
+#ifndef png_debug2\r
+#define png_debug2(l, m, p1, p2)\r
+#endif\r
+\r
+extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));\r
+extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));\r
+extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));\r
+extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));\r
+\r
+#ifdef PNG_MNG_FEATURES_SUPPORTED\r
+extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp\r
+ png_ptr, png_uint_32 mng_features_permitted));\r
+#endif\r
+\r
+/* For use in png_set_keep_unknown, added to version 1.2.6 */\r
+#define PNG_HANDLE_CHUNK_AS_DEFAULT 0\r
+#define PNG_HANDLE_CHUNK_NEVER 1\r
+#define PNG_HANDLE_CHUNK_IF_SAFE 2\r
+#define PNG_HANDLE_CHUNK_ALWAYS 3\r
+\r
+/* Added to version 1.2.0 */\r
+#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)\r
+#if defined(PNG_MMX_CODE_SUPPORTED)\r
+#define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */\r
+#define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */\r
+#define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04\r
+#define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08\r
+#define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10\r
+#define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20\r
+#define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40\r
+#define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80\r
+#define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */\r
+\r
+#define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \\r
+ | PNG_ASM_FLAG_MMX_READ_INTERLACE \\r
+ | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \\r
+ | PNG_ASM_FLAG_MMX_READ_FILTER_UP \\r
+ | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \\r
+ | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )\r
+#define PNG_MMX_WRITE_FLAGS ( 0 )\r
+\r
+#define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \\r
+ | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \\r
+ | PNG_MMX_READ_FLAGS \\r
+ | PNG_MMX_WRITE_FLAGS )\r
+\r
+#define PNG_SELECT_READ 1\r
+#define PNG_SELECT_WRITE 2\r
+#endif /* PNG_MMX_CODE_SUPPORTED */\r
+\r
+#if !defined(PNG_1_0_X)\r
+/* pngget.c */\r
+extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)\r
+ PNGARG((int flag_select, int *compilerID));\r
+\r
+/* pngget.c */\r
+extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)\r
+ PNGARG((int flag_select));\r
+\r
+/* pngget.c */\r
+extern PNG_EXPORT(png_uint_32,png_get_asm_flags)\r
+ PNGARG((png_structp png_ptr));\r
+\r
+/* pngget.c */\r
+extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)\r
+ PNGARG((png_structp png_ptr));\r
+\r
+/* pngget.c */\r
+extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)\r
+ PNGARG((png_structp png_ptr));\r
+\r
+/* pngset.c */\r
+extern PNG_EXPORT(void,png_set_asm_flags)\r
+ PNGARG((png_structp png_ptr, png_uint_32 asm_flags));\r
+\r
+/* pngset.c */\r
+extern PNG_EXPORT(void,png_set_mmx_thresholds)\r
+ PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,\r
+ png_uint_32 mmx_rowbytes_threshold));\r
+\r
+#endif /* PNG_1_0_X */\r
+\r
+#if !defined(PNG_1_0_X)\r
+/* png.c, pnggccrd.c, or pngvcrd.c */\r
+extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));\r
+#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */\r
+\r
+/* Strip the prepended error numbers ("#nnn ") from error and warning\r
+ * messages before passing them to the error or warning handler. */\r
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED\r
+extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp\r
+ png_ptr, png_uint_32 strip_mode));\r
+#endif\r
+\r
+#endif /* PNG_1_0_X */\r
+\r
+/* Added at libpng-1.2.6 */\r
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED\r
+extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp\r
+ png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));\r
+extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp\r
+ png_ptr));\r
+extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp\r
+ png_ptr));\r
+#endif\r
+\r
+\r
+/* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */\r
+\r
+#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED\r
+/* With these routines we avoid an integer divide, which will be slower on\r
+ * most machines. However, it does take more operations than the corresponding\r
+ * divide method, so it may be slower on a few RISC systems. There are two\r
+ * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.\r
+ *\r
+ * Note that the rounding factors are NOT supposed to be the same! 128 and\r
+ * 32768 are correct for the NODIV code; 127 and 32767 are correct for the\r
+ * standard method.\r
+ *\r
+ * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]\r
+ */\r
+\r
+ /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */\r
+\r
+# define png_composite(composite, fg, alpha, bg) \\r
+ { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \\r
+ + (png_uint_16)(bg)*(png_uint_16)(255 - \\r
+ (png_uint_16)(alpha)) + (png_uint_16)128); \\r
+ (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }\r
+\r
+# define png_composite_16(composite, fg, alpha, bg) \\r
+ { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \\r
+ + (png_uint_32)(bg)*(png_uint_32)(65535L - \\r
+ (png_uint_32)(alpha)) + (png_uint_32)32768L); \\r
+ (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }\r
+\r
+#else /* standard method using integer division */\r
+\r
+# define png_composite(composite, fg, alpha, bg) \\r
+ (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \\r
+ (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \\r
+ (png_uint_16)127) / 255)\r
+\r
+# define png_composite_16(composite, fg, alpha, bg) \\r
+ (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \\r
+ (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \\r
+ (png_uint_32)32767) / (png_uint_32)65535L)\r
+\r
+#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */\r
+\r
+/* Inline macros to do direct reads of bytes from the input buffer. These\r
+ * require that you are using an architecture that uses PNG byte ordering\r
+ * (MSB first) and supports unaligned data storage. I think that PowerPC\r
+ * in big-endian mode and 680x0 are the only ones that will support this.\r
+ * The x86 line of processors definitely do not. The png_get_int_32()\r
+ * routine also assumes we are using two's complement format for negative\r
+ * values, which is almost certainly true.\r
+ */\r
+#if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)\r
+# define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))\r
+# define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))\r
+# define png_get_int_32(buf) ( *((png_int_32p) (buf)))\r
+#else\r
+extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));\r
+extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));\r
+extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));\r
+#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */\r
+extern PNG_EXPORT(png_uint_32,png_get_uint_31)\r
+ PNGARG((png_structp png_ptr, png_bytep buf));\r
+/* No png_get_int_16 -- may be added if there's a real need for it. */\r
+\r
+/* Place a 32-bit number into a buffer in PNG byte order (big-endian).\r
+ */\r
+extern PNG_EXPORT(void,png_save_uint_32)\r
+ PNGARG((png_bytep buf, png_uint_32 i));\r
+extern PNG_EXPORT(void,png_save_int_32)\r
+ PNGARG((png_bytep buf, png_int_32 i));\r
+\r
+/* Place a 16-bit number into a buffer in PNG byte order.\r
+ * The parameter is declared unsigned int, not png_uint_16,\r
+ * just to avoid potential problems on pre-ANSI C compilers.\r
+ */\r
+extern PNG_EXPORT(void,png_save_uint_16)\r
+ PNGARG((png_bytep buf, unsigned int i));\r
+/* No png_save_int_16 -- may be added if there's a real need for it. */\r
+\r
+/* ************************************************************************* */\r
+\r
+/* These next functions are used internally in the code. They generally\r
+ * shouldn't be used unless you are writing code to add or replace some\r
+ * functionality in libpng. More information about most functions can\r
+ * be found in the files where the functions are located.\r
+ */\r
+\r
+\r
+/* Various modes of operation, that are visible to applications because\r
+ * they are used for unknown chunk location.\r
+ */\r
+#define PNG_HAVE_IHDR 0x01\r
+#define PNG_HAVE_PLTE 0x02\r
+#define PNG_HAVE_IDAT 0x04\r
+#define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */\r
+#define PNG_HAVE_IEND 0x10\r
+\r
+#if defined(PNG_INTERNAL)\r
+\r
+/* More modes of operation. Note that after an init, mode is set to\r
+ * zero automatically when the structure is created.\r
+ */\r
+#define PNG_HAVE_gAMA 0x20\r
+#define PNG_HAVE_cHRM 0x40\r
+#define PNG_HAVE_sRGB 0x80\r
+#define PNG_HAVE_CHUNK_HEADER 0x100\r
+#define PNG_WROTE_tIME 0x200\r
+#define PNG_WROTE_INFO_BEFORE_PLTE 0x400\r
+#define PNG_BACKGROUND_IS_GRAY 0x800\r
+#define PNG_HAVE_PNG_SIGNATURE 0x1000\r
+#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */\r
+\r
+/* flags for the transformations the PNG library does on the image data */\r
+#define PNG_BGR 0x0001\r
+#define PNG_INTERLACE 0x0002\r
+#define PNG_PACK 0x0004\r
+#define PNG_SHIFT 0x0008\r
+#define PNG_SWAP_BYTES 0x0010\r
+#define PNG_INVERT_MONO 0x0020\r
+#define PNG_DITHER 0x0040\r
+#define PNG_BACKGROUND 0x0080\r
+#define PNG_BACKGROUND_EXPAND 0x0100\r
+ /* 0x0200 unused */\r
+#define PNG_16_TO_8 0x0400\r
+#define PNG_RGBA 0x0800\r
+#define PNG_EXPAND 0x1000\r
+#define PNG_GAMMA 0x2000\r
+#define PNG_GRAY_TO_RGB 0x4000\r
+#define PNG_FILLER 0x8000L\r
+#define PNG_PACKSWAP 0x10000L\r
+#define PNG_SWAP_ALPHA 0x20000L\r
+#define PNG_STRIP_ALPHA 0x40000L\r
+#define PNG_INVERT_ALPHA 0x80000L\r
+#define PNG_USER_TRANSFORM 0x100000L\r
+#define PNG_RGB_TO_GRAY_ERR 0x200000L\r
+#define PNG_RGB_TO_GRAY_WARN 0x400000L\r
+#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */\r
+ /* 0x800000L Unused */\r
+#define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */\r
+#define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */\r
+ /* 0x4000000L unused */\r
+ /* 0x8000000L unused */\r
+ /* 0x10000000L unused */\r
+ /* 0x20000000L unused */\r
+ /* 0x40000000L unused */\r
+\r
+/* flags for png_create_struct */\r
+#define PNG_STRUCT_PNG 0x0001\r
+#define PNG_STRUCT_INFO 0x0002\r
+\r
+/* Scaling factor for filter heuristic weighting calculations */\r
+#define PNG_WEIGHT_SHIFT 8\r
+#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))\r
+#define PNG_COST_SHIFT 3\r
+#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))\r
+\r
+/* flags for the png_ptr->flags rather than declaring a byte for each one */\r
+#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001\r
+#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002\r
+#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004\r
+#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008\r
+#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010\r
+#define PNG_FLAG_ZLIB_FINISHED 0x0020\r
+#define PNG_FLAG_ROW_INIT 0x0040\r
+#define PNG_FLAG_FILLER_AFTER 0x0080\r
+#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100\r
+#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200\r
+#define PNG_FLAG_CRC_CRITICAL_USE 0x0400\r
+#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800\r
+#define PNG_FLAG_FREE_PLTE 0x1000\r
+#define PNG_FLAG_FREE_TRNS 0x2000\r
+#define PNG_FLAG_FREE_HIST 0x4000\r
+#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L\r
+#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L\r
+#define PNG_FLAG_LIBRARY_MISMATCH 0x20000L\r
+#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L\r
+#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L\r
+#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L\r
+#define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */\r
+#define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */\r
+ /* 0x800000L unused */\r
+ /* 0x1000000L unused */\r
+ /* 0x2000000L unused */\r
+ /* 0x4000000L unused */\r
+ /* 0x8000000L unused */\r
+ /* 0x10000000L unused */\r
+ /* 0x20000000L unused */\r
+ /* 0x40000000L unused */\r
+\r
+#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \\r
+ PNG_FLAG_CRC_ANCILLARY_NOWARN)\r
+\r
+#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \\r
+ PNG_FLAG_CRC_CRITICAL_IGNORE)\r
+\r
+#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \\r
+ PNG_FLAG_CRC_CRITICAL_MASK)\r
+\r
+/* save typing and make code easier to understand */\r
+\r
+#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \\r
+ abs((int)((c1).green) - (int)((c2).green)) + \\r
+ abs((int)((c1).blue) - (int)((c2).blue)))\r
+\r
+/* Added to libpng-1.2.6 JB */\r
+#define PNG_ROWBYTES(pixel_bits, width) \\r
+ ((pixel_bits) >= 8 ? \\r
+ ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \\r
+ (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )\r
+\r
+/* PNG_OUT_OF_RANGE returns true if value is outside the range\r
+ ideal-delta..ideal+delta. Each argument is evaluated twice.\r
+ "ideal" and "delta" should be constants, normally simple\r
+ integers, "value" a variable. Added to libpng-1.2.6 JB */\r
+#define PNG_OUT_OF_RANGE(value, ideal, delta) \\r
+ ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )\r
+\r
+/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */\r
+#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)\r
+/* place to hold the signature string for a PNG file. */\r
+#ifdef PNG_USE_GLOBAL_ARRAYS\r
+ PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];\r
+#else\r
+#endif\r
+#endif /* PNG_NO_EXTERN */\r
+\r
+/* Constant strings for known chunk types. If you need to add a chunk,\r
+ * define the name here, and add an invocation of the macro in png.c and\r
+ * wherever it's needed.\r
+ */\r
+#define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}\r
+#define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}\r
+#define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}\r
+#define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}\r
+#define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}\r
+#define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}\r
+#define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}\r
+#define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}\r
+#define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}\r
+#define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}\r
+#define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}\r
+#define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}\r
+#define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}\r
+#define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}\r
+#define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}\r
+#define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}\r
+#define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}\r
+#define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}\r
+#define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}\r
+#define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}\r
+#define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}\r
+\r
+#ifdef PNG_USE_GLOBAL_ARRAYS\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];\r
+PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];\r
+#endif /* PNG_USE_GLOBAL_ARRAYS */\r
+\r
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)\r
+/* Initialize png_ptr struct for reading, and allocate any other memory.\r
+ * (old interface - DEPRECATED - use png_create_read_struct instead).\r
+ */\r
+extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));\r
+#undef png_read_init\r
+#define png_read_init(png_ptr) png_read_init_3(&png_ptr, \\r
+ PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));\r
+#endif\r
+\r
+extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,\r
+ png_const_charp user_png_ver, png_size_t png_struct_size));\r
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)\r
+extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,\r
+ png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t\r
+ png_info_size));\r
+#endif\r
+\r
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)\r
+/* Initialize png_ptr struct for writing, and allocate any other memory.\r
+ * (old interface - DEPRECATED - use png_create_write_struct instead).\r
+ */\r
+extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));\r
+#undef png_write_init\r
+#define png_write_init(png_ptr) png_write_init_3(&png_ptr, \\r
+ PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));\r
+#endif\r
+\r
+extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,\r
+ png_const_charp user_png_ver, png_size_t png_struct_size));\r
+extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,\r
+ png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t\r
+ png_info_size));\r
+\r
+/* Allocate memory for an internal libpng struct */\r
+PNG_EXTERN png_voidp png_create_struct PNGARG((int type));\r
+\r
+/* Free memory from internal libpng struct */\r
+PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));\r
+\r
+PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr\r
+ malloc_fn, png_voidp mem_ptr));\r
+PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,\r
+ png_free_ptr free_fn, png_voidp mem_ptr));\r
+\r
+/* Free any memory that info_ptr points to and reset struct. */\r
+PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr));\r
+\r
+#ifndef PNG_1_0_X\r
+/* Function to allocate memory for zlib. */\r
+PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));\r
+\r
+/* Function to free memory for zlib */\r
+PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));\r
+\r
+#ifdef PNG_SIZE_T\r
+/* Function to convert a sizeof an item to png_sizeof item */\r
+ PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));\r
+#endif\r
+\r
+/* Next four functions are used internally as callbacks. PNGAPI is required\r
+ * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */\r
+\r
+PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,\r
+ png_bytep data, png_size_t length));\r
+\r
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED\r
+PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,\r
+ png_bytep buffer, png_size_t length));\r
+#endif\r
+\r
+PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,\r
+ png_bytep data, png_size_t length));\r
+\r
+#if defined(PNG_WRITE_FLUSH_SUPPORTED)\r
+#if !defined(PNG_NO_STDIO)\r
+PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));\r
+#endif\r
+#endif\r
+#else /* PNG_1_0_X */\r
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED\r
+PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,\r
+ png_bytep buffer, png_size_t length));\r
+#endif\r
+#endif /* PNG_1_0_X */\r
+\r
+/* Reset the CRC variable */\r
+PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));\r
+\r
+/* Write the "data" buffer to whatever output you are using. */\r
+PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,\r
+ png_size_t length));\r
+\r
+/* Read data from whatever input you are using into the "data" buffer */\r
+PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,\r
+ png_size_t length));\r
+\r
+/* Read bytes into buf, and update png_ptr->crc */\r
+PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,\r
+ png_size_t length));\r
+\r
+/* Decompress data in a chunk that uses compression */\r
+#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \\r
+ defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)\r
+PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,\r
+ int comp_type, png_size_t chunklength,\r
+ png_size_t prefix_length, png_size_t *data_length));\r
+#endif\r
+\r
+/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */\r
+PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));\r
+\r
+/* Read the CRC from the file and compare it to the libpng calculated CRC */\r
+PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));\r
+\r
+/* Calculate the CRC over a section of data. Note that we are only\r
+ * passing a maximum of 64K on systems that have this as a memory limit,\r
+ * since this is the maximum buffer size we can specify.\r
+ */\r
+PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,\r
+ png_size_t length));\r
+\r
+#if defined(PNG_WRITE_FLUSH_SUPPORTED)\r
+PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));\r
+#endif\r
+\r
+/* simple function to write the signature */\r
+PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));\r
+\r
+/* write various chunks */\r
+\r
+/* Write the IHDR chunk, and update the png_struct with the necessary\r
+ * information.\r
+ */\r
+PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,\r
+ png_uint_32 height,\r
+ int bit_depth, int color_type, int compression_method, int filter_method,\r
+ int interlace_method));\r
+\r
+PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,\r
+ png_uint_32 num_pal));\r
+\r
+PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,\r
+ png_size_t length));\r
+\r
+PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));\r
+\r
+#if defined(PNG_WRITE_gAMA_SUPPORTED)\r
+#ifdef PNG_FLOATING_POINT_SUPPORTED\r
+PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));\r
+#endif\r
+#ifdef PNG_FIXED_POINT_SUPPORTED\r
+PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point\r
+ file_gamma));\r
+#endif\r
+#endif\r
+\r
+#if defined(PNG_WRITE_sBIT_SUPPORTED)\r
+PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,\r
+ int color_type));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_cHRM_SUPPORTED)\r
+#ifdef PNG_FLOATING_POINT_SUPPORTED\r
+PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,\r
+ double white_x, double white_y,\r
+ double red_x, double red_y, double green_x, double green_y,\r
+ double blue_x, double blue_y));\r
+#endif\r
+#ifdef PNG_FIXED_POINT_SUPPORTED\r
+PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,\r
+ png_fixed_point int_white_x, png_fixed_point int_white_y,\r
+ png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point\r
+ int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,\r
+ png_fixed_point int_blue_y));\r
+#endif\r
+#endif\r
+\r
+#if defined(PNG_WRITE_sRGB_SUPPORTED)\r
+PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,\r
+ int intent));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_iCCP_SUPPORTED)\r
+PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,\r
+ png_charp name, int compression_type,\r
+ png_charp profile, int proflen));\r
+ /* Note to maintainer: profile should be png_bytep */\r
+#endif\r
+\r
+#if defined(PNG_WRITE_sPLT_SUPPORTED)\r
+PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,\r
+ png_sPLT_tp palette));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_tRNS_SUPPORTED)\r
+PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,\r
+ png_color_16p values, int number, int color_type));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_bKGD_SUPPORTED)\r
+PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,\r
+ png_color_16p values, int color_type));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_hIST_SUPPORTED)\r
+PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,\r
+ int num_hist));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \\r
+ defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)\r
+PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,\r
+ png_charp key, png_charpp new_key));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_tEXt_SUPPORTED)\r
+PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,\r
+ png_charp text, png_size_t text_len));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_zTXt_SUPPORTED)\r
+PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,\r
+ png_charp text, png_size_t text_len, int compression));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_iTXt_SUPPORTED)\r
+PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,\r
+ int compression, png_charp key, png_charp lang, png_charp lang_key,\r
+ png_charp text));\r
+#endif\r
+\r
+#if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */\r
+PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_textp text_ptr, int num_text));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_oFFs_SUPPORTED)\r
+PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,\r
+ png_int_32 x_offset, png_int_32 y_offset, int unit_type));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_pCAL_SUPPORTED)\r
+PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,\r
+ png_int_32 X0, png_int_32 X1, int type, int nparams,\r
+ png_charp units, png_charpp params));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_pHYs_SUPPORTED)\r
+PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,\r
+ png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,\r
+ int unit_type));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_tIME_SUPPORTED)\r
+PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,\r
+ png_timep mod_time));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_sCAL_SUPPORTED)\r
+#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)\r
+PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,\r
+ int unit, double width, double height));\r
+#else\r
+#ifdef PNG_FIXED_POINT_SUPPORTED\r
+PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,\r
+ int unit, png_charp width, png_charp height));\r
+#endif\r
+#endif\r
+#endif\r
+\r
+/* Called when finished processing a row of data */\r
+PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));\r
+\r
+/* Internal use only. Called before first row of data */\r
+PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));\r
+\r
+#if defined(PNG_READ_GAMMA_SUPPORTED)\r
+PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));\r
+#endif\r
+\r
+/* combine a row of data, dealing with alpha, etc. if requested */\r
+PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,\r
+ int mask));\r
+\r
+#if defined(PNG_READ_INTERLACING_SUPPORTED)\r
+/* expand an interlaced row */\r
+/* OLD pre-1.0.9 interface:\r
+PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,\r
+ png_bytep row, int pass, png_uint_32 transformations));\r
+ */\r
+PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));\r
+#endif\r
+\r
+/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */\r
+\r
+#if defined(PNG_WRITE_INTERLACING_SUPPORTED)\r
+/* grab pixels out of a row for an interlaced pass */\r
+PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,\r
+ png_bytep row, int pass));\r
+#endif\r
+\r
+/* unfilter a row */\r
+PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,\r
+ png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));\r
+\r
+/* Choose the best filter to use and filter the row data */\r
+PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,\r
+ png_row_infop row_info));\r
+\r
+/* Write out the filtered row. */\r
+PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,\r
+ png_bytep filtered_row));\r
+/* finish a row while reading, dealing with interlacing passes, etc. */\r
+PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));\r
+\r
+/* initialize the row buffers, etc. */\r
+PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));\r
+/* optional call to update the users info structure */\r
+PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr));\r
+\r
+/* these are the functions that do the transformations */\r
+#if defined(PNG_READ_FILLER_SUPPORTED)\r
+PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,\r
+ png_bytep row, png_uint_32 filler, png_uint_32 flags));\r
+#endif\r
+\r
+#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)\r
+PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,\r
+ png_bytep row));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)\r
+PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,\r
+ png_bytep row));\r
+#endif\r
+\r
+#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)\r
+PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,\r
+ png_bytep row));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)\r
+PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,\r
+ png_bytep row));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_FILLER_SUPPORTED) || \\r
+ defined(PNG_READ_STRIP_ALPHA_SUPPORTED)\r
+PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,\r
+ png_bytep row, png_uint_32 flags));\r
+#endif\r
+\r
+#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)\r
+PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));\r
+#endif\r
+\r
+#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)\r
+PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));\r
+#endif\r
+\r
+#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)\r
+PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop\r
+ row_info, png_bytep row));\r
+#endif\r
+\r
+#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)\r
+PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,\r
+ png_bytep row));\r
+#endif\r
+\r
+#if defined(PNG_READ_PACK_SUPPORTED)\r
+PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));\r
+#endif\r
+\r
+#if defined(PNG_READ_SHIFT_SUPPORTED)\r
+PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,\r
+ png_color_8p sig_bits));\r
+#endif\r
+\r
+#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)\r
+PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));\r
+#endif\r
+\r
+#if defined(PNG_READ_16_TO_8_SUPPORTED)\r
+PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));\r
+#endif\r
+\r
+#if defined(PNG_READ_DITHER_SUPPORTED)\r
+PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,\r
+ png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));\r
+\r
+# if defined(PNG_CORRECT_PALETTE_SUPPORTED)\r
+PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,\r
+ png_colorp palette, int num_palette));\r
+# endif\r
+#endif\r
+\r
+#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)\r
+PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_PACK_SUPPORTED)\r
+PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,\r
+ png_bytep row, png_uint_32 bit_depth));\r
+#endif\r
+\r
+#if defined(PNG_WRITE_SHIFT_SUPPORTED)\r
+PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,\r
+ png_color_8p bit_depth));\r
+#endif\r
+\r
+#if defined(PNG_READ_BACKGROUND_SUPPORTED)\r
+#if defined(PNG_READ_GAMMA_SUPPORTED)\r
+PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,\r
+ png_color_16p trans_values, png_color_16p background,\r
+ png_color_16p background_1,\r
+ png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,\r
+ png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,\r
+ png_uint_16pp gamma_16_to_1, int gamma_shift));\r
+#else\r
+PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,\r
+ png_color_16p trans_values, png_color_16p background));\r
+#endif\r
+#endif\r
+\r
+#if defined(PNG_READ_GAMMA_SUPPORTED)\r
+PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,\r
+ png_bytep gamma_table, png_uint_16pp gamma_16_table,\r
+ int gamma_shift));\r
+#endif\r
+\r
+#if defined(PNG_READ_EXPAND_SUPPORTED)\r
+PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,\r
+ png_bytep row, png_colorp palette, png_bytep trans, int num_trans));\r
+PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,\r
+ png_bytep row, png_color_16p trans_value));\r
+#endif\r
+\r
+/* The following decodes the appropriate chunks, and does error correction,\r
+ * then calls the appropriate callback for the chunk if it is valid.\r
+ */\r
+\r
+/* decode the IHDR chunk */\r
+PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+\r
+#if defined(PNG_READ_bKGD_SUPPORTED)\r
+PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+#endif\r
+\r
+#if defined(PNG_READ_cHRM_SUPPORTED)\r
+PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+#endif\r
+\r
+#if defined(PNG_READ_gAMA_SUPPORTED)\r
+PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+#endif\r
+\r
+#if defined(PNG_READ_hIST_SUPPORTED)\r
+PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+#endif\r
+\r
+#if defined(PNG_READ_iCCP_SUPPORTED)\r
+extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+#endif /* PNG_READ_iCCP_SUPPORTED */\r
+\r
+#if defined(PNG_READ_iTXt_SUPPORTED)\r
+PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+#endif\r
+\r
+#if defined(PNG_READ_oFFs_SUPPORTED)\r
+PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+#endif\r
+\r
+#if defined(PNG_READ_pCAL_SUPPORTED)\r
+PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+#endif\r
+\r
+#if defined(PNG_READ_pHYs_SUPPORTED)\r
+PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+#endif\r
+\r
+#if defined(PNG_READ_sBIT_SUPPORTED)\r
+PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+#endif\r
+\r
+#if defined(PNG_READ_sCAL_SUPPORTED)\r
+PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+#endif\r
+\r
+#if defined(PNG_READ_sPLT_SUPPORTED)\r
+extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+#endif /* PNG_READ_sPLT_SUPPORTED */\r
+\r
+#if defined(PNG_READ_sRGB_SUPPORTED)\r
+PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+#endif\r
+\r
+#if defined(PNG_READ_tEXt_SUPPORTED)\r
+PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+#endif\r
+\r
+#if defined(PNG_READ_tIME_SUPPORTED)\r
+PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+#endif\r
+\r
+#if defined(PNG_READ_tRNS_SUPPORTED)\r
+PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+#endif\r
+\r
+#if defined(PNG_READ_zTXt_SUPPORTED)\r
+PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,\r
+ png_uint_32 length));\r
+#endif\r
+\r
+PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_uint_32 length));\r
+\r
+PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,\r
+ png_bytep chunk_name));\r
+\r
+/* handle the transformations for reading and writing */\r
+PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));\r
+PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));\r
+\r
+PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));\r
+\r
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED\r
+PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr));\r
+PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr));\r
+PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));\r
+PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,\r
+ png_uint_32 length));\r
+PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));\r
+PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));\r
+PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,\r
+ png_bytep buffer, png_size_t buffer_length));\r
+PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));\r
+PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,\r
+ png_bytep buffer, png_size_t buffer_length));\r
+PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));\r
+PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_uint_32 length));\r
+PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr));\r
+PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr));\r
+PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));\r
+PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr));\r
+PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr));\r
+PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));\r
+#if defined(PNG_READ_tEXt_SUPPORTED)\r
+PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_uint_32 length));\r
+PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr));\r
+#endif\r
+#if defined(PNG_READ_zTXt_SUPPORTED)\r
+PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_uint_32 length));\r
+PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr));\r
+#endif\r
+#if defined(PNG_READ_iTXt_SUPPORTED)\r
+PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr, png_uint_32 length));\r
+PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,\r
+ png_infop info_ptr));\r
+#endif\r
+\r
+#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */\r
+\r
+#ifdef PNG_MNG_FEATURES_SUPPORTED\r
+PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,\r
+ png_bytep row));\r
+PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,\r
+ png_bytep row));\r
+#endif\r
+\r
+#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)\r
+#if defined(PNG_MMX_CODE_SUPPORTED)\r
+/* png.c */ /* PRIVATE */\r
+PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));\r
+#endif\r
+#endif\r
+\r
+#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)\r
+PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,\r
+png_infop info_ptr));\r
+\r
+PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,\r
+png_infop info_ptr));\r
+\r
+PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,\r
+png_infop info_ptr));\r
+\r
+PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,\r
+png_infop info_ptr));\r
+\r
+PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,\r
+png_infop info_ptr));\r
+\r
+#if defined(PNG_pHYs_SUPPORTED)\r
+PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,\r
+png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));\r
+#endif /* PNG_pHYs_SUPPORTED */\r
+#endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */\r
+\r
+/* Read the chunk header (length + type name) */\r
+PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));\r
+\r
+/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */\r
+\r
+#endif /* PNG_INTERNAL */\r
+\r
+#ifdef __cplusplus\r
+}\r
+#endif\r
+\r
+#endif /* PNG_VERSION_INFO_ONLY */\r
+/* do not put anything past this line */\r
+#endif /* PNG_H */\r
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