--- /dev/null
+\r
+/* pngwrite.c - general routines to write a PNG file\r
+ *\r
+ * Last changed in libpng 1.2.31 [August 19, 2008]\r
+ * For conditions of distribution and use, see copyright notice in png.h\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
+\r
+/* get internal access to png.h */\r
+#define PNG_INTERNAL\r
+#include "png.h"\r
+#ifdef PNG_WRITE_SUPPORTED\r
+\r
+/* Writes all the PNG information. This is the suggested way to use the\r
+ * library. If you have a new chunk to add, make a function to write it,\r
+ * and put it in the correct location here. If you want the chunk written\r
+ * after the image data, put it in png_write_end(). I strongly encourage\r
+ * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing\r
+ * the chunk, as that will keep the code from breaking if you want to just\r
+ * write a plain PNG file. If you have long comments, I suggest writing\r
+ * them in png_write_end(), and compressing them.\r
+ */\r
+void PNGAPI\r
+png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)\r
+{\r
+ png_debug(1, "in png_write_info_before_PLTE\n");\r
+ if (png_ptr == NULL || info_ptr == NULL)\r
+ return;\r
+ if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))\r
+ {\r
+ png_write_sig(png_ptr); /* write PNG signature */\r
+#if defined(PNG_MNG_FEATURES_SUPPORTED)\r
+ if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&(png_ptr->mng_features_permitted))\r
+ {\r
+ png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");\r
+ png_ptr->mng_features_permitted=0;\r
+ }\r
+#endif\r
+ /* write IHDR information. */\r
+ png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,\r
+ info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,\r
+ info_ptr->filter_type,\r
+#if defined(PNG_WRITE_INTERLACING_SUPPORTED)\r
+ info_ptr->interlace_type);\r
+#else\r
+ 0);\r
+#endif\r
+ /* the rest of these check to see if the valid field has the appropriate\r
+ flag set, and if it does, writes the chunk. */\r
+#if defined(PNG_WRITE_gAMA_SUPPORTED)\r
+ if (info_ptr->valid & PNG_INFO_gAMA)\r
+ {\r
+# ifdef PNG_FLOATING_POINT_SUPPORTED\r
+ png_write_gAMA(png_ptr, info_ptr->gamma);\r
+#else\r
+#ifdef PNG_FIXED_POINT_SUPPORTED\r
+ png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);\r
+# endif\r
+#endif\r
+ }\r
+#endif\r
+#if defined(PNG_WRITE_sRGB_SUPPORTED)\r
+ if (info_ptr->valid & PNG_INFO_sRGB)\r
+ png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);\r
+#endif\r
+#if defined(PNG_WRITE_iCCP_SUPPORTED)\r
+ if (info_ptr->valid & PNG_INFO_iCCP)\r
+ png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,\r
+ info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);\r
+#endif\r
+#if defined(PNG_WRITE_sBIT_SUPPORTED)\r
+ if (info_ptr->valid & PNG_INFO_sBIT)\r
+ png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);\r
+#endif\r
+#if defined(PNG_WRITE_cHRM_SUPPORTED)\r
+ if (info_ptr->valid & PNG_INFO_cHRM)\r
+ {\r
+#ifdef PNG_FLOATING_POINT_SUPPORTED\r
+ png_write_cHRM(png_ptr,\r
+ info_ptr->x_white, info_ptr->y_white,\r
+ info_ptr->x_red, info_ptr->y_red,\r
+ info_ptr->x_green, info_ptr->y_green,\r
+ info_ptr->x_blue, info_ptr->y_blue);\r
+#else\r
+# ifdef PNG_FIXED_POINT_SUPPORTED\r
+ png_write_cHRM_fixed(png_ptr,\r
+ info_ptr->int_x_white, info_ptr->int_y_white,\r
+ info_ptr->int_x_red, info_ptr->int_y_red,\r
+ info_ptr->int_x_green, info_ptr->int_y_green,\r
+ info_ptr->int_x_blue, info_ptr->int_y_blue);\r
+# endif\r
+#endif\r
+ }\r
+#endif\r
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)\r
+ if (info_ptr->unknown_chunks_num)\r
+ {\r
+ png_unknown_chunk *up;\r
+\r
+ png_debug(5, "writing extra chunks\n");\r
+\r
+ for (up = info_ptr->unknown_chunks;\r
+ up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;\r
+ up++)\r
+ {\r
+ int keep=png_handle_as_unknown(png_ptr, up->name);\r
+ if (keep != PNG_HANDLE_CHUNK_NEVER &&\r
+ up->location && !(up->location & PNG_HAVE_PLTE) &&\r
+ !(up->location & PNG_HAVE_IDAT) &&\r
+ ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||\r
+ (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))\r
+ {\r
+ if (up->size == 0)\r
+ png_warning(png_ptr, "Writing zero-length unknown chunk");\r
+ png_write_chunk(png_ptr, up->name, up->data, up->size);\r
+ }\r
+ }\r
+ }\r
+#endif\r
+ png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;\r
+ }\r
+}\r
+\r
+void PNGAPI\r
+png_write_info(png_structp png_ptr, png_infop info_ptr)\r
+{\r
+#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)\r
+ int i;\r
+#endif\r
+\r
+ png_debug(1, "in png_write_info\n");\r
+\r
+ if (png_ptr == NULL || info_ptr == NULL)\r
+ return;\r
+\r
+ png_write_info_before_PLTE(png_ptr, info_ptr);\r
+\r
+ if (info_ptr->valid & PNG_INFO_PLTE)\r
+ png_write_PLTE(png_ptr, info_ptr->palette,\r
+ (png_uint_32)info_ptr->num_palette);\r
+ else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)\r
+ png_error(png_ptr, "Valid palette required for paletted images");\r
+\r
+#if defined(PNG_WRITE_tRNS_SUPPORTED)\r
+ if (info_ptr->valid & PNG_INFO_tRNS)\r
+ {\r
+#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)\r
+ /* invert the alpha channel (in tRNS) */\r
+ if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&\r
+ info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)\r
+ {\r
+ int j;\r
+ for (j=0; j<(int)info_ptr->num_trans; j++)\r
+ info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);\r
+ }\r
+#endif\r
+ png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),\r
+ info_ptr->num_trans, info_ptr->color_type);\r
+ }\r
+#endif\r
+#if defined(PNG_WRITE_bKGD_SUPPORTED)\r
+ if (info_ptr->valid & PNG_INFO_bKGD)\r
+ png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);\r
+#endif\r
+#if defined(PNG_WRITE_hIST_SUPPORTED)\r
+ if (info_ptr->valid & PNG_INFO_hIST)\r
+ png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);\r
+#endif\r
+#if defined(PNG_WRITE_oFFs_SUPPORTED)\r
+ if (info_ptr->valid & PNG_INFO_oFFs)\r
+ png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,\r
+ info_ptr->offset_unit_type);\r
+#endif\r
+#if defined(PNG_WRITE_pCAL_SUPPORTED)\r
+ if (info_ptr->valid & PNG_INFO_pCAL)\r
+ png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,\r
+ info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,\r
+ info_ptr->pcal_units, info_ptr->pcal_params);\r
+#endif\r
+#if defined(PNG_WRITE_sCAL_SUPPORTED)\r
+ if (info_ptr->valid & PNG_INFO_sCAL)\r
+#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)\r
+ png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,\r
+ info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);\r
+#else\r
+#ifdef PNG_FIXED_POINT_SUPPORTED\r
+ png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,\r
+ info_ptr->scal_s_width, info_ptr->scal_s_height);\r
+#else\r
+ png_warning(png_ptr,\r
+ "png_write_sCAL not supported; sCAL chunk not written.");\r
+#endif\r
+#endif\r
+#endif\r
+#if defined(PNG_WRITE_pHYs_SUPPORTED)\r
+ if (info_ptr->valid & PNG_INFO_pHYs)\r
+ png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,\r
+ info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);\r
+#endif\r
+#if defined(PNG_WRITE_tIME_SUPPORTED)\r
+ if (info_ptr->valid & PNG_INFO_tIME)\r
+ {\r
+ png_write_tIME(png_ptr, &(info_ptr->mod_time));\r
+ png_ptr->mode |= PNG_WROTE_tIME;\r
+ }\r
+#endif\r
+#if defined(PNG_WRITE_sPLT_SUPPORTED)\r
+ if (info_ptr->valid & PNG_INFO_sPLT)\r
+ for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)\r
+ png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);\r
+#endif\r
+#if defined(PNG_WRITE_TEXT_SUPPORTED)\r
+ /* Check to see if we need to write text chunks */\r
+ for (i = 0; i < info_ptr->num_text; i++)\r
+ {\r
+ png_debug2(2, "Writing header text chunk %d, type %d\n", i,\r
+ info_ptr->text[i].compression);\r
+ /* an internationalized chunk? */\r
+ if (info_ptr->text[i].compression > 0)\r
+ {\r
+#if defined(PNG_WRITE_iTXt_SUPPORTED)\r
+ /* write international chunk */\r
+ png_write_iTXt(png_ptr,\r
+ info_ptr->text[i].compression,\r
+ info_ptr->text[i].key,\r
+ info_ptr->text[i].lang,\r
+ info_ptr->text[i].lang_key,\r
+ info_ptr->text[i].text);\r
+#else\r
+ png_warning(png_ptr, "Unable to write international text");\r
+#endif\r
+ /* Mark this chunk as written */\r
+ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;\r
+ }\r
+ /* If we want a compressed text chunk */\r
+ else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)\r
+ {\r
+#if defined(PNG_WRITE_zTXt_SUPPORTED)\r
+ /* write compressed chunk */\r
+ png_write_zTXt(png_ptr, info_ptr->text[i].key,\r
+ info_ptr->text[i].text, 0,\r
+ info_ptr->text[i].compression);\r
+#else\r
+ png_warning(png_ptr, "Unable to write compressed text");\r
+#endif\r
+ /* Mark this chunk as written */\r
+ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;\r
+ }\r
+ else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)\r
+ {\r
+#if defined(PNG_WRITE_tEXt_SUPPORTED)\r
+ /* write uncompressed chunk */\r
+ png_write_tEXt(png_ptr, info_ptr->text[i].key,\r
+ info_ptr->text[i].text,\r
+ 0);\r
+#else\r
+ png_warning(png_ptr, "Unable to write uncompressed text");\r
+#endif\r
+ /* Mark this chunk as written */\r
+ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;\r
+ }\r
+ }\r
+#endif\r
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)\r
+ if (info_ptr->unknown_chunks_num)\r
+ {\r
+ png_unknown_chunk *up;\r
+\r
+ png_debug(5, "writing extra chunks\n");\r
+\r
+ for (up = info_ptr->unknown_chunks;\r
+ up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;\r
+ up++)\r
+ {\r
+ int keep=png_handle_as_unknown(png_ptr, up->name);\r
+ if (keep != PNG_HANDLE_CHUNK_NEVER &&\r
+ up->location && (up->location & PNG_HAVE_PLTE) &&\r
+ !(up->location & PNG_HAVE_IDAT) &&\r
+ ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||\r
+ (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))\r
+ {\r
+ png_write_chunk(png_ptr, up->name, up->data, up->size);\r
+ }\r
+ }\r
+ }\r
+#endif\r
+}\r
+\r
+/* Writes the end of the PNG file. If you don't want to write comments or\r
+ * time information, you can pass NULL for info. If you already wrote these\r
+ * in png_write_info(), do not write them again here. If you have long\r
+ * comments, I suggest writing them here, and compressing them.\r
+ */\r
+void PNGAPI\r
+png_write_end(png_structp png_ptr, png_infop info_ptr)\r
+{\r
+ png_debug(1, "in png_write_end\n");\r
+ if (png_ptr == NULL)\r
+ return;\r
+ if (!(png_ptr->mode & PNG_HAVE_IDAT))\r
+ png_error(png_ptr, "No IDATs written into file");\r
+\r
+ /* see if user wants us to write information chunks */\r
+ if (info_ptr != NULL)\r
+ {\r
+#if defined(PNG_WRITE_TEXT_SUPPORTED)\r
+ int i; /* local index variable */\r
+#endif\r
+#if defined(PNG_WRITE_tIME_SUPPORTED)\r
+ /* check to see if user has supplied a time chunk */\r
+ if ((info_ptr->valid & PNG_INFO_tIME) &&\r
+ !(png_ptr->mode & PNG_WROTE_tIME))\r
+ png_write_tIME(png_ptr, &(info_ptr->mod_time));\r
+#endif\r
+#if defined(PNG_WRITE_TEXT_SUPPORTED)\r
+ /* loop through comment chunks */\r
+ for (i = 0; i < info_ptr->num_text; i++)\r
+ {\r
+ png_debug2(2, "Writing trailer text chunk %d, type %d\n", i,\r
+ info_ptr->text[i].compression);\r
+ /* an internationalized chunk? */\r
+ if (info_ptr->text[i].compression > 0)\r
+ {\r
+#if defined(PNG_WRITE_iTXt_SUPPORTED)\r
+ /* write international chunk */\r
+ png_write_iTXt(png_ptr,\r
+ info_ptr->text[i].compression,\r
+ info_ptr->text[i].key,\r
+ info_ptr->text[i].lang,\r
+ info_ptr->text[i].lang_key,\r
+ info_ptr->text[i].text);\r
+#else\r
+ png_warning(png_ptr, "Unable to write international text");\r
+#endif\r
+ /* Mark this chunk as written */\r
+ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;\r
+ }\r
+ else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)\r
+ {\r
+#if defined(PNG_WRITE_zTXt_SUPPORTED)\r
+ /* write compressed chunk */\r
+ png_write_zTXt(png_ptr, info_ptr->text[i].key,\r
+ info_ptr->text[i].text, 0,\r
+ info_ptr->text[i].compression);\r
+#else\r
+ png_warning(png_ptr, "Unable to write compressed text");\r
+#endif\r
+ /* Mark this chunk as written */\r
+ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;\r
+ }\r
+ else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)\r
+ {\r
+#if defined(PNG_WRITE_tEXt_SUPPORTED)\r
+ /* write uncompressed chunk */\r
+ png_write_tEXt(png_ptr, info_ptr->text[i].key,\r
+ info_ptr->text[i].text, 0);\r
+#else\r
+ png_warning(png_ptr, "Unable to write uncompressed text");\r
+#endif\r
+\r
+ /* Mark this chunk as written */\r
+ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;\r
+ }\r
+ }\r
+#endif\r
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)\r
+ if (info_ptr->unknown_chunks_num)\r
+ {\r
+ png_unknown_chunk *up;\r
+\r
+ png_debug(5, "writing extra chunks\n");\r
+\r
+ for (up = info_ptr->unknown_chunks;\r
+ up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;\r
+ up++)\r
+ {\r
+ int keep=png_handle_as_unknown(png_ptr, up->name);\r
+ if (keep != PNG_HANDLE_CHUNK_NEVER &&\r
+ up->location && (up->location & PNG_AFTER_IDAT) &&\r
+ ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||\r
+ (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))\r
+ {\r
+ png_write_chunk(png_ptr, up->name, up->data, up->size);\r
+ }\r
+ }\r
+ }\r
+#endif\r
+ }\r
+\r
+ png_ptr->mode |= PNG_AFTER_IDAT;\r
+\r
+ /* write end of PNG file */\r
+ png_write_IEND(png_ptr);\r
+ /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03,\r
+ * and restored again in libpng-1.2.30, may cause some applications that\r
+ * do not set png_ptr->output_flush_fn to crash. If your application\r
+ * experiences a problem, please try building libpng with\r
+ * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to\r
+ * png-mng-implement at lists.sf.net . This kludge will be removed\r
+ * from libpng-1.4.0.\r
+ */\r
+#if defined(PNG_WRITE_FLUSH_SUPPORTED) && \\r
+ defined(PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED)\r
+ png_flush(png_ptr);\r
+#endif\r
+}\r
+\r
+#if defined(PNG_WRITE_tIME_SUPPORTED)\r
+#if !defined(_WIN32_WCE)\r
+/* "time.h" functions are not supported on WindowsCE */\r
+void PNGAPI\r
+png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)\r
+{\r
+ png_debug(1, "in png_convert_from_struct_tm\n");\r
+ ptime->year = (png_uint_16)(1900 + ttime->tm_year);\r
+ ptime->month = (png_byte)(ttime->tm_mon + 1);\r
+ ptime->day = (png_byte)ttime->tm_mday;\r
+ ptime->hour = (png_byte)ttime->tm_hour;\r
+ ptime->minute = (png_byte)ttime->tm_min;\r
+ ptime->second = (png_byte)ttime->tm_sec;\r
+}\r
+\r
+void PNGAPI\r
+png_convert_from_time_t(png_timep ptime, time_t ttime)\r
+{\r
+ struct tm *tbuf;\r
+\r
+ png_debug(1, "in png_convert_from_time_t\n");\r
+ tbuf = gmtime(&ttime);\r
+ png_convert_from_struct_tm(ptime, tbuf);\r
+}\r
+#endif\r
+#endif\r
+\r
+/* Initialize png_ptr structure, and allocate any memory needed */\r
+png_structp PNGAPI\r
+png_create_write_struct(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_USER_MEM_SUPPORTED\r
+ return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,\r
+ warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));\r
+}\r
+\r
+/* Alternate initialize png_ptr structure, and allocate any memory needed */\r
+png_structp PNGAPI\r
+png_create_write_struct_2(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
+{\r
+#endif /* PNG_USER_MEM_SUPPORTED */\r
+#ifdef PNG_SETJMP_SUPPORTED\r
+ volatile\r
+#endif\r
+ png_structp png_ptr;\r
+#ifdef PNG_SETJMP_SUPPORTED\r
+#ifdef USE_FAR_KEYWORD\r
+ jmp_buf jmpbuf;\r
+#endif\r
+#endif\r
+ int i;\r
+ png_debug(1, "in png_create_write_struct\n");\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,\r
+ (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);\r
+#else\r
+ png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);\r
+#endif /* PNG_USER_MEM_SUPPORTED */\r
+ if (png_ptr == NULL)\r
+ return (NULL);\r
+\r
+ /* added at libpng-1.2.6 */\r
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED\r
+ png_ptr->user_width_max=PNG_USER_WIDTH_MAX;\r
+ png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;\r
+#endif\r
+\r
+#ifdef PNG_SETJMP_SUPPORTED\r
+#ifdef USE_FAR_KEYWORD\r
+ if (setjmp(jmpbuf))\r
+#else\r
+ if (setjmp(png_ptr->jmpbuf))\r
+#endif\r
+ {\r
+ png_free(png_ptr, png_ptr->zbuf);\r
+ png_ptr->zbuf=NULL;\r
+ png_destroy_struct(png_ptr);\r
+ return (NULL);\r
+ }\r
+#ifdef USE_FAR_KEYWORD\r
+ png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));\r
+#endif\r
+#endif\r
+\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);\r
+#endif /* PNG_USER_MEM_SUPPORTED */\r
+ png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);\r
+\r
+ if (user_png_ver)\r
+ {\r
+ i=0;\r
+ do\r
+ {\r
+ if (user_png_ver[i] != png_libpng_ver[i])\r
+ png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;\r
+ } while (png_libpng_ver[i++]);\r
+ }\r
+\r
+ if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)\r
+ {\r
+ /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so\r
+ * we must recompile any applications that use any older library version.\r
+ * For versions after libpng 1.0, we will be compatible, so we need\r
+ * only check the first digit.\r
+ */\r
+ if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||\r
+ (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||\r
+ (user_png_ver[0] == '0' && user_png_ver[2] < '9'))\r
+ {\r
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)\r
+ char msg[80];\r
+ if (user_png_ver)\r
+ {\r
+ png_snprintf(msg, 80,\r
+ "Application was compiled with png.h from libpng-%.20s",\r
+ user_png_ver);\r
+ png_warning(png_ptr, msg);\r
+ }\r
+ png_snprintf(msg, 80,\r
+ "Application is running with png.c from libpng-%.20s",\r
+ png_libpng_ver);\r
+ png_warning(png_ptr, msg);\r
+#endif\r
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED\r
+ png_ptr->flags=0;\r
+#endif\r
+ png_error(png_ptr,\r
+ "Incompatible libpng version in application and library");\r
+ }\r
+ }\r
+\r
+ /* initialize zbuf - compression buffer */\r
+ png_ptr->zbuf_size = PNG_ZBUF_SIZE;\r
+ png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,\r
+ (png_uint_32)png_ptr->zbuf_size);\r
+\r
+ png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,\r
+ png_flush_ptr_NULL);\r
+\r
+#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)\r
+ png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,\r
+ 1, png_doublep_NULL, png_doublep_NULL);\r
+#endif\r
+\r
+#ifdef PNG_SETJMP_SUPPORTED\r
+/* Applications that neglect to set up their own setjmp() and then encounter\r
+ a png_error() will longjmp here. Since the jmpbuf is then meaningless we\r
+ abort instead of returning. */\r
+#ifdef USE_FAR_KEYWORD\r
+ if (setjmp(jmpbuf))\r
+ PNG_ABORT();\r
+ png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));\r
+#else\r
+ if (setjmp(png_ptr->jmpbuf))\r
+ PNG_ABORT();\r
+#endif\r
+#endif\r
+ return (png_ptr);\r
+}\r
+\r
+/* Initialize png_ptr structure, and allocate any memory needed */\r
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)\r
+/* Deprecated. */\r
+#undef png_write_init\r
+void PNGAPI\r
+png_write_init(png_structp png_ptr)\r
+{\r
+ /* We only come here via pre-1.0.7-compiled applications */\r
+ png_write_init_2(png_ptr, "1.0.6 or earlier", 0, 0);\r
+}\r
+\r
+void PNGAPI\r
+png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,\r
+ png_size_t png_struct_size, png_size_t png_info_size)\r
+{\r
+ /* We only come here via pre-1.0.12-compiled applications */\r
+ if (png_ptr == NULL) return;\r
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)\r
+ if (png_sizeof(png_struct) > png_struct_size ||\r
+ png_sizeof(png_info) > png_info_size)\r
+ {\r
+ char msg[80];\r
+ png_ptr->warning_fn=NULL;\r
+ if (user_png_ver)\r
+ {\r
+ png_snprintf(msg, 80,\r
+ "Application was compiled with png.h from libpng-%.20s",\r
+ user_png_ver);\r
+ png_warning(png_ptr, msg);\r
+ }\r
+ png_snprintf(msg, 80,\r
+ "Application is running with png.c from libpng-%.20s",\r
+ png_libpng_ver);\r
+ png_warning(png_ptr, msg);\r
+ }\r
+#endif\r
+ if (png_sizeof(png_struct) > png_struct_size)\r
+ {\r
+ png_ptr->error_fn=NULL;\r
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED\r
+ png_ptr->flags=0;\r
+#endif\r
+ png_error(png_ptr,\r
+ "The png struct allocated by the application for writing is too small.");\r
+ }\r
+ if (png_sizeof(png_info) > png_info_size)\r
+ {\r
+ png_ptr->error_fn=NULL;\r
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED\r
+ png_ptr->flags=0;\r
+#endif\r
+ png_error(png_ptr,\r
+ "The info struct allocated by the application for writing is too small.");\r
+ }\r
+ png_write_init_3(&png_ptr, user_png_ver, png_struct_size);\r
+}\r
+#endif /* PNG_1_0_X || PNG_1_2_X */\r
+\r
+\r
+void PNGAPI\r
+png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,\r
+ png_size_t png_struct_size)\r
+{\r
+ png_structp png_ptr=*ptr_ptr;\r
+#ifdef PNG_SETJMP_SUPPORTED\r
+ jmp_buf tmp_jmp; /* to save current jump buffer */\r
+#endif\r
+\r
+ int i = 0;\r
+\r
+ if (png_ptr == NULL)\r
+ return;\r
+\r
+ do\r
+ {\r
+ if (user_png_ver[i] != png_libpng_ver[i])\r
+ {\r
+#ifdef PNG_LEGACY_SUPPORTED\r
+ png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;\r
+#else\r
+ png_ptr->warning_fn=NULL;\r
+ png_warning(png_ptr,\r
+ "Application uses deprecated png_write_init() and should be recompiled.");\r
+ break;\r
+#endif\r
+ }\r
+ } while (png_libpng_ver[i++]);\r
+\r
+ png_debug(1, "in png_write_init_3\n");\r
+\r
+#ifdef PNG_SETJMP_SUPPORTED\r
+ /* save jump buffer and error functions */\r
+ png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));\r
+#endif\r
+\r
+ if (png_sizeof(png_struct) > png_struct_size)\r
+ {\r
+ png_destroy_struct(png_ptr);\r
+ png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);\r
+ *ptr_ptr = png_ptr;\r
+ }\r
+\r
+ /* reset all variables to 0 */\r
+ png_memset(png_ptr, 0, png_sizeof(png_struct));\r
+\r
+ /* added at libpng-1.2.6 */\r
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED\r
+ png_ptr->user_width_max=PNG_USER_WIDTH_MAX;\r
+ png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;\r
+#endif\r
+\r
+#ifdef PNG_SETJMP_SUPPORTED\r
+ /* restore jump buffer */\r
+ png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));\r
+#endif\r
+\r
+ png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,\r
+ png_flush_ptr_NULL);\r
+\r
+ /* initialize zbuf - compression buffer */\r
+ png_ptr->zbuf_size = PNG_ZBUF_SIZE;\r
+ png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,\r
+ (png_uint_32)png_ptr->zbuf_size);\r
+\r
+#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)\r
+ png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,\r
+ 1, png_doublep_NULL, png_doublep_NULL);\r
+#endif\r
+}\r
+\r
+/* Write a few rows of image data. If the image is interlaced,\r
+ * either you will have to write the 7 sub images, or, if you\r
+ * have called png_set_interlace_handling(), you will have to\r
+ * "write" the image seven times.\r
+ */\r
+void PNGAPI\r
+png_write_rows(png_structp png_ptr, png_bytepp row,\r
+ png_uint_32 num_rows)\r
+{\r
+ png_uint_32 i; /* row counter */\r
+ png_bytepp rp; /* row pointer */\r
+\r
+ png_debug(1, "in png_write_rows\n");\r
+\r
+ if (png_ptr == NULL)\r
+ return;\r
+\r
+ /* loop through the rows */\r
+ for (i = 0, rp = row; i < num_rows; i++, rp++)\r
+ {\r
+ png_write_row(png_ptr, *rp);\r
+ }\r
+}\r
+\r
+/* Write the image. You only need to call this function once, even\r
+ * if you are writing an interlaced image.\r
+ */\r
+void PNGAPI\r
+png_write_image(png_structp png_ptr, png_bytepp image)\r
+{\r
+ png_uint_32 i; /* row index */\r
+ int pass, num_pass; /* pass variables */\r
+ png_bytepp rp; /* points to current row */\r
+\r
+ if (png_ptr == NULL)\r
+ return;\r
+\r
+ png_debug(1, "in png_write_image\n");\r
+#if defined(PNG_WRITE_INTERLACING_SUPPORTED)\r
+ /* intialize interlace handling. If image is not interlaced,\r
+ this will set pass to 1 */\r
+ num_pass = png_set_interlace_handling(png_ptr);\r
+#else\r
+ num_pass = 1;\r
+#endif\r
+ /* loop through passes */\r
+ for (pass = 0; pass < num_pass; pass++)\r
+ {\r
+ /* loop through image */\r
+ for (i = 0, rp = image; i < png_ptr->height; i++, rp++)\r
+ {\r
+ png_write_row(png_ptr, *rp);\r
+ }\r
+ }\r
+}\r
+\r
+/* called by user to write a row of image data */\r
+void PNGAPI\r
+png_write_row(png_structp png_ptr, png_bytep row)\r
+{\r
+ if (png_ptr == NULL)\r
+ return;\r
+ png_debug2(1, "in png_write_row (row %ld, pass %d)\n",\r
+ png_ptr->row_number, png_ptr->pass);\r
+\r
+ /* initialize transformations and other stuff if first time */\r
+ if (png_ptr->row_number == 0 && png_ptr->pass == 0)\r
+ {\r
+ /* make sure we wrote the header info */\r
+ if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))\r
+ png_error(png_ptr,\r
+ "png_write_info was never called before png_write_row.");\r
+\r
+ /* check for transforms that have been set but were defined out */\r
+#if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)\r
+ if (png_ptr->transformations & PNG_INVERT_MONO)\r
+ png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined.");\r
+#endif\r
+#if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)\r
+ if (png_ptr->transformations & PNG_FILLER)\r
+ png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined.");\r
+#endif\r
+#if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && defined(PNG_READ_PACKSWAP_SUPPORTED)\r
+ if (png_ptr->transformations & PNG_PACKSWAP)\r
+ png_warning(png_ptr, "PNG_WRITE_PACKSWAP_SUPPORTED is not defined.");\r
+#endif\r
+#if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)\r
+ if (png_ptr->transformations & PNG_PACK)\r
+ png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined.");\r
+#endif\r
+#if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)\r
+ if (png_ptr->transformations & PNG_SHIFT)\r
+ png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined.");\r
+#endif\r
+#if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)\r
+ if (png_ptr->transformations & PNG_BGR)\r
+ png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined.");\r
+#endif\r
+#if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)\r
+ if (png_ptr->transformations & PNG_SWAP_BYTES)\r
+ png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");\r
+#endif\r
+\r
+ png_write_start_row(png_ptr);\r
+ }\r
+\r
+#if defined(PNG_WRITE_INTERLACING_SUPPORTED)\r
+ /* if interlaced and not interested in row, return */\r
+ if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))\r
+ {\r
+ switch (png_ptr->pass)\r
+ {\r
+ case 0:\r
+ if (png_ptr->row_number & 0x07)\r
+ {\r
+ png_write_finish_row(png_ptr);\r
+ return;\r
+ }\r
+ break;\r
+ case 1:\r
+ if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)\r
+ {\r
+ png_write_finish_row(png_ptr);\r
+ return;\r
+ }\r
+ break;\r
+ case 2:\r
+ if ((png_ptr->row_number & 0x07) != 4)\r
+ {\r
+ png_write_finish_row(png_ptr);\r
+ return;\r
+ }\r
+ break;\r
+ case 3:\r
+ if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)\r
+ {\r
+ png_write_finish_row(png_ptr);\r
+ return;\r
+ }\r
+ break;\r
+ case 4:\r
+ if ((png_ptr->row_number & 0x03) != 2)\r
+ {\r
+ png_write_finish_row(png_ptr);\r
+ return;\r
+ }\r
+ break;\r
+ case 5:\r
+ if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)\r
+ {\r
+ png_write_finish_row(png_ptr);\r
+ return;\r
+ }\r
+ break;\r
+ case 6:\r
+ if (!(png_ptr->row_number & 0x01))\r
+ {\r
+ png_write_finish_row(png_ptr);\r
+ return;\r
+ }\r
+ break;\r
+ }\r
+ }\r
+#endif\r
+\r
+ /* set up row info for transformations */\r
+ png_ptr->row_info.color_type = png_ptr->color_type;\r
+ png_ptr->row_info.width = png_ptr->usr_width;\r
+ png_ptr->row_info.channels = png_ptr->usr_channels;\r
+ png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth;\r
+ png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *\r
+ png_ptr->row_info.channels);\r
+\r
+ png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,\r
+ png_ptr->row_info.width);\r
+\r
+ png_debug1(3, "row_info->color_type = %d\n", png_ptr->row_info.color_type);\r
+ png_debug1(3, "row_info->width = %lu\n", png_ptr->row_info.width);\r
+ png_debug1(3, "row_info->channels = %d\n", png_ptr->row_info.channels);\r
+ png_debug1(3, "row_info->bit_depth = %d\n", png_ptr->row_info.bit_depth);\r
+ png_debug1(3, "row_info->pixel_depth = %d\n", png_ptr->row_info.pixel_depth);\r
+ png_debug1(3, "row_info->rowbytes = %lu\n", png_ptr->row_info.rowbytes);\r
+\r
+ /* Copy user's row into buffer, leaving room for filter byte. */\r
+ png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,\r
+ png_ptr->row_info.rowbytes);\r
+\r
+#if defined(PNG_WRITE_INTERLACING_SUPPORTED)\r
+ /* handle interlacing */\r
+ if (png_ptr->interlaced && png_ptr->pass < 6 &&\r
+ (png_ptr->transformations & PNG_INTERLACE))\r
+ {\r
+ png_do_write_interlace(&(png_ptr->row_info),\r
+ png_ptr->row_buf + 1, png_ptr->pass);\r
+ /* this should always get caught above, but still ... */\r
+ if (!(png_ptr->row_info.width))\r
+ {\r
+ png_write_finish_row(png_ptr);\r
+ return;\r
+ }\r
+ }\r
+#endif\r
+\r
+ /* handle other transformations */\r
+ if (png_ptr->transformations)\r
+ png_do_write_transformations(png_ptr);\r
+\r
+#if defined(PNG_MNG_FEATURES_SUPPORTED)\r
+ /* Write filter_method 64 (intrapixel differencing) only if\r
+ * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and\r
+ * 2. Libpng did not write a PNG signature (this filter_method is only\r
+ * used in PNG datastreams that are embedded in MNG datastreams) and\r
+ * 3. The application called png_permit_mng_features with a mask that\r
+ * included PNG_FLAG_MNG_FILTER_64 and\r
+ * 4. The filter_method is 64 and\r
+ * 5. The color_type is RGB or RGBA\r
+ */\r
+ if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&\r
+ (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))\r
+ {\r
+ /* Intrapixel differencing */\r
+ png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);\r
+ }\r
+#endif\r
+\r
+ /* Find a filter if necessary, filter the row and write it out. */\r
+ png_write_find_filter(png_ptr, &(png_ptr->row_info));\r
+\r
+ if (png_ptr->write_row_fn != NULL)\r
+ (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);\r
+}\r
+\r
+#if defined(PNG_WRITE_FLUSH_SUPPORTED)\r
+/* Set the automatic flush interval or 0 to turn flushing off */\r
+void PNGAPI\r
+png_set_flush(png_structp png_ptr, int nrows)\r
+{\r
+ png_debug(1, "in png_set_flush\n");\r
+ if (png_ptr == NULL)\r
+ return;\r
+ png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);\r
+}\r
+\r
+/* flush the current output buffers now */\r
+void PNGAPI\r
+png_write_flush(png_structp png_ptr)\r
+{\r
+ int wrote_IDAT;\r
+\r
+ png_debug(1, "in png_write_flush\n");\r
+ if (png_ptr == NULL)\r
+ return;\r
+ /* We have already written out all of the data */\r
+ if (png_ptr->row_number >= png_ptr->num_rows)\r
+ return;\r
+\r
+ do\r
+ {\r
+ int ret;\r
+\r
+ /* compress the data */\r
+ ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);\r
+ wrote_IDAT = 0;\r
+\r
+ /* check for compression errors */\r
+ if (ret != Z_OK)\r
+ {\r
+ if (png_ptr->zstream.msg != NULL)\r
+ png_error(png_ptr, png_ptr->zstream.msg);\r
+ else\r
+ png_error(png_ptr, "zlib error");\r
+ }\r
+\r
+ if (!(png_ptr->zstream.avail_out))\r
+ {\r
+ /* write the IDAT and reset the zlib output buffer */\r
+ png_write_IDAT(png_ptr, png_ptr->zbuf,\r
+ png_ptr->zbuf_size);\r
+ png_ptr->zstream.next_out = png_ptr->zbuf;\r
+ png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;\r
+ wrote_IDAT = 1;\r
+ }\r
+ } while(wrote_IDAT == 1);\r
+\r
+ /* If there is any data left to be output, write it into a new IDAT */\r
+ if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)\r
+ {\r
+ /* write the IDAT and reset the zlib output buffer */\r
+ png_write_IDAT(png_ptr, png_ptr->zbuf,\r
+ png_ptr->zbuf_size - png_ptr->zstream.avail_out);\r
+ png_ptr->zstream.next_out = png_ptr->zbuf;\r
+ png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;\r
+ }\r
+ png_ptr->flush_rows = 0;\r
+ png_flush(png_ptr);\r
+}\r
+#endif /* PNG_WRITE_FLUSH_SUPPORTED */\r
+\r
+/* free all memory used by the write */\r
+void PNGAPI\r
+png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)\r
+{\r
+ png_structp png_ptr = NULL;\r
+ png_infop info_ptr = NULL;\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ png_free_ptr free_fn = NULL;\r
+ png_voidp mem_ptr = NULL;\r
+#endif\r
+\r
+ png_debug(1, "in png_destroy_write_struct\n");\r
+ if (png_ptr_ptr != NULL)\r
+ {\r
+ png_ptr = *png_ptr_ptr;\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ free_fn = png_ptr->free_fn;\r
+ mem_ptr = png_ptr->mem_ptr;\r
+#endif\r
+ }\r
+\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ if (png_ptr != NULL)\r
+ {\r
+ free_fn = png_ptr->free_fn;\r
+ mem_ptr = png_ptr->mem_ptr;\r
+ }\r
+#endif\r
+\r
+ if (info_ptr_ptr != NULL)\r
+ info_ptr = *info_ptr_ptr;\r
+\r
+ if (info_ptr != NULL)\r
+ {\r
+ if (png_ptr != NULL)\r
+ {\r
+ png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);\r
+\r
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)\r
+ if (png_ptr->num_chunk_list)\r
+ {\r
+ png_free(png_ptr, png_ptr->chunk_list);\r
+ png_ptr->chunk_list=NULL;\r
+ png_ptr->num_chunk_list = 0;\r
+ }\r
+#endif\r
+ }\r
+\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,\r
+ (png_voidp)mem_ptr);\r
+#else\r
+ png_destroy_struct((png_voidp)info_ptr);\r
+#endif\r
+ *info_ptr_ptr = NULL;\r
+ }\r
+\r
+ if (png_ptr != NULL)\r
+ {\r
+ png_write_destroy(png_ptr);\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,\r
+ (png_voidp)mem_ptr);\r
+#else\r
+ png_destroy_struct((png_voidp)png_ptr);\r
+#endif\r
+ *png_ptr_ptr = NULL;\r
+ }\r
+}\r
+\r
+\r
+/* Free any memory used in png_ptr struct (old method) */\r
+void /* PRIVATE */\r
+png_write_destroy(png_structp png_ptr)\r
+{\r
+#ifdef PNG_SETJMP_SUPPORTED\r
+ jmp_buf tmp_jmp; /* save jump buffer */\r
+#endif\r
+ png_error_ptr error_fn;\r
+ png_error_ptr warning_fn;\r
+ png_voidp error_ptr;\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ png_free_ptr free_fn;\r
+#endif\r
+\r
+ png_debug(1, "in png_write_destroy\n");\r
+ /* free any memory zlib uses */\r
+ deflateEnd(&png_ptr->zstream);\r
+\r
+ /* free our memory. png_free checks NULL for us. */\r
+ png_free(png_ptr, png_ptr->zbuf);\r
+ png_free(png_ptr, png_ptr->row_buf);\r
+#ifndef PNG_NO_WRITE_FILTER\r
+ png_free(png_ptr, png_ptr->prev_row);\r
+ png_free(png_ptr, png_ptr->sub_row);\r
+ png_free(png_ptr, png_ptr->up_row);\r
+ png_free(png_ptr, png_ptr->avg_row);\r
+ png_free(png_ptr, png_ptr->paeth_row);\r
+#endif\r
+\r
+#if defined(PNG_TIME_RFC1123_SUPPORTED)\r
+ png_free(png_ptr, png_ptr->time_buffer);\r
+#endif\r
+\r
+#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)\r
+ png_free(png_ptr, png_ptr->prev_filters);\r
+ png_free(png_ptr, png_ptr->filter_weights);\r
+ png_free(png_ptr, png_ptr->inv_filter_weights);\r
+ png_free(png_ptr, png_ptr->filter_costs);\r
+ png_free(png_ptr, png_ptr->inv_filter_costs);\r
+#endif\r
+\r
+#ifdef PNG_SETJMP_SUPPORTED\r
+ /* reset structure */\r
+ png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));\r
+#endif\r
+\r
+ error_fn = png_ptr->error_fn;\r
+ warning_fn = png_ptr->warning_fn;\r
+ error_ptr = png_ptr->error_ptr;\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ free_fn = png_ptr->free_fn;\r
+#endif\r
+\r
+ png_memset(png_ptr, 0, png_sizeof(png_struct));\r
+\r
+ png_ptr->error_fn = error_fn;\r
+ png_ptr->warning_fn = warning_fn;\r
+ png_ptr->error_ptr = error_ptr;\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ png_ptr->free_fn = free_fn;\r
+#endif\r
+\r
+#ifdef PNG_SETJMP_SUPPORTED\r
+ png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));\r
+#endif\r
+}\r
+\r
+/* Allow the application to select one or more row filters to use. */\r
+void PNGAPI\r
+png_set_filter(png_structp png_ptr, int method, int filters)\r
+{\r
+ png_debug(1, "in png_set_filter\n");\r
+ if (png_ptr == NULL)\r
+ return;\r
+#if defined(PNG_MNG_FEATURES_SUPPORTED)\r
+ if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&\r
+ (method == PNG_INTRAPIXEL_DIFFERENCING))\r
+ method = PNG_FILTER_TYPE_BASE;\r
+#endif\r
+ if (method == PNG_FILTER_TYPE_BASE)\r
+ {\r
+ switch (filters & (PNG_ALL_FILTERS | 0x07))\r
+ {\r
+#ifndef PNG_NO_WRITE_FILTER\r
+ case 5:\r
+ case 6:\r
+ case 7: png_warning(png_ptr, "Unknown row filter for method 0");\r
+#endif /* PNG_NO_WRITE_FILTER */\r
+ case PNG_FILTER_VALUE_NONE:\r
+ png_ptr->do_filter=PNG_FILTER_NONE; break;\r
+#ifndef PNG_NO_WRITE_FILTER\r
+ case PNG_FILTER_VALUE_SUB:\r
+ png_ptr->do_filter=PNG_FILTER_SUB; break;\r
+ case PNG_FILTER_VALUE_UP:\r
+ png_ptr->do_filter=PNG_FILTER_UP; break;\r
+ case PNG_FILTER_VALUE_AVG:\r
+ png_ptr->do_filter=PNG_FILTER_AVG; break;\r
+ case PNG_FILTER_VALUE_PAETH:\r
+ png_ptr->do_filter=PNG_FILTER_PAETH; break;\r
+ default: png_ptr->do_filter = (png_byte)filters; break;\r
+#else\r
+ default: png_warning(png_ptr, "Unknown row filter for method 0");\r
+#endif /* PNG_NO_WRITE_FILTER */\r
+ }\r
+\r
+ /* If we have allocated the row_buf, this means we have already started\r
+ * with the image and we should have allocated all of the filter buffers\r
+ * that have been selected. If prev_row isn't already allocated, then\r
+ * it is too late to start using the filters that need it, since we\r
+ * will be missing the data in the previous row. If an application\r
+ * wants to start and stop using particular filters during compression,\r
+ * it should start out with all of the filters, and then add and\r
+ * remove them after the start of compression.\r
+ */\r
+ if (png_ptr->row_buf != NULL)\r
+ {\r
+#ifndef PNG_NO_WRITE_FILTER\r
+ if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)\r
+ {\r
+ png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,\r
+ (png_ptr->rowbytes + 1));\r
+ png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;\r
+ }\r
+\r
+ if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)\r
+ {\r
+ if (png_ptr->prev_row == NULL)\r
+ {\r
+ png_warning(png_ptr, "Can't add Up filter after starting");\r
+ png_ptr->do_filter &= ~PNG_FILTER_UP;\r
+ }\r
+ else\r
+ {\r
+ png_ptr->up_row = (png_bytep)png_malloc(png_ptr,\r
+ (png_ptr->rowbytes + 1));\r
+ png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;\r
+ }\r
+ }\r
+\r
+ if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)\r
+ {\r
+ if (png_ptr->prev_row == NULL)\r
+ {\r
+ png_warning(png_ptr, "Can't add Average filter after starting");\r
+ png_ptr->do_filter &= ~PNG_FILTER_AVG;\r
+ }\r
+ else\r
+ {\r
+ png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,\r
+ (png_ptr->rowbytes + 1));\r
+ png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;\r
+ }\r
+ }\r
+\r
+ if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&\r
+ png_ptr->paeth_row == NULL)\r
+ {\r
+ if (png_ptr->prev_row == NULL)\r
+ {\r
+ png_warning(png_ptr, "Can't add Paeth filter after starting");\r
+ png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);\r
+ }\r
+ else\r
+ {\r
+ png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,\r
+ (png_ptr->rowbytes + 1));\r
+ png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;\r
+ }\r
+ }\r
+\r
+ if (png_ptr->do_filter == PNG_NO_FILTERS)\r
+#endif /* PNG_NO_WRITE_FILTER */\r
+ png_ptr->do_filter = PNG_FILTER_NONE;\r
+ }\r
+ }\r
+ else\r
+ png_error(png_ptr, "Unknown custom filter method");\r
+}\r
+\r
+/* This allows us to influence the way in which libpng chooses the "best"\r
+ * filter for the current scanline. While the "minimum-sum-of-absolute-\r
+ * differences metric is relatively fast and effective, there is some\r
+ * question as to whether it can be improved upon by trying to keep the\r
+ * filtered data going to zlib more consistent, hopefully resulting in\r
+ * better compression.\r
+ */\r
+#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* GRR 970116 */\r
+void PNGAPI\r
+png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,\r
+ int num_weights, png_doublep filter_weights,\r
+ png_doublep filter_costs)\r
+{\r
+ int i;\r
+\r
+ png_debug(1, "in png_set_filter_heuristics\n");\r
+ if (png_ptr == NULL)\r
+ return;\r
+ if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)\r
+ {\r
+ png_warning(png_ptr, "Unknown filter heuristic method");\r
+ return;\r
+ }\r
+\r
+ if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT)\r
+ {\r
+ heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;\r
+ }\r
+\r
+ if (num_weights < 0 || filter_weights == NULL ||\r
+ heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)\r
+ {\r
+ num_weights = 0;\r
+ }\r
+\r
+ png_ptr->num_prev_filters = (png_byte)num_weights;\r
+ png_ptr->heuristic_method = (png_byte)heuristic_method;\r
+\r
+ if (num_weights > 0)\r
+ {\r
+ if (png_ptr->prev_filters == NULL)\r
+ {\r
+ png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,\r
+ (png_uint_32)(png_sizeof(png_byte) * num_weights));\r
+\r
+ /* To make sure that the weighting starts out fairly */\r
+ for (i = 0; i < num_weights; i++)\r
+ {\r
+ png_ptr->prev_filters[i] = 255;\r
+ }\r
+ }\r
+\r
+ if (png_ptr->filter_weights == NULL)\r
+ {\r
+ png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,\r
+ (png_uint_32)(png_sizeof(png_uint_16) * num_weights));\r
+\r
+ png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,\r
+ (png_uint_32)(png_sizeof(png_uint_16) * num_weights));\r
+ for (i = 0; i < num_weights; i++)\r
+ {\r
+ png_ptr->inv_filter_weights[i] =\r
+ png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;\r
+ }\r
+ }\r
+\r
+ for (i = 0; i < num_weights; i++)\r
+ {\r
+ if (filter_weights[i] < 0.0)\r
+ {\r
+ png_ptr->inv_filter_weights[i] =\r
+ png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;\r
+ }\r
+ else\r
+ {\r
+ png_ptr->inv_filter_weights[i] =\r
+ (png_uint_16)((double)PNG_WEIGHT_FACTOR*filter_weights[i]+0.5);\r
+ png_ptr->filter_weights[i] =\r
+ (png_uint_16)((double)PNG_WEIGHT_FACTOR/filter_weights[i]+0.5);\r
+ }\r
+ }\r
+ }\r
+\r
+ /* If, in the future, there are other filter methods, this would\r
+ * need to be based on png_ptr->filter.\r
+ */\r
+ if (png_ptr->filter_costs == NULL)\r
+ {\r
+ png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,\r
+ (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));\r
+\r
+ png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,\r
+ (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));\r
+\r
+ for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)\r
+ {\r
+ png_ptr->inv_filter_costs[i] =\r
+ png_ptr->filter_costs[i] = PNG_COST_FACTOR;\r
+ }\r
+ }\r
+\r
+ /* Here is where we set the relative costs of the different filters. We\r
+ * should take the desired compression level into account when setting\r
+ * the costs, so that Paeth, for instance, has a high relative cost at low\r
+ * compression levels, while it has a lower relative cost at higher\r
+ * compression settings. The filter types are in order of increasing\r
+ * relative cost, so it would be possible to do this with an algorithm.\r
+ */\r
+ for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)\r
+ {\r
+ if (filter_costs == NULL || filter_costs[i] < 0.0)\r
+ {\r
+ png_ptr->inv_filter_costs[i] =\r
+ png_ptr->filter_costs[i] = PNG_COST_FACTOR;\r
+ }\r
+ else if (filter_costs[i] >= 1.0)\r
+ {\r
+ png_ptr->inv_filter_costs[i] =\r
+ (png_uint_16)((double)PNG_COST_FACTOR / filter_costs[i] + 0.5);\r
+ png_ptr->filter_costs[i] =\r
+ (png_uint_16)((double)PNG_COST_FACTOR * filter_costs[i] + 0.5);\r
+ }\r
+ }\r
+}\r
+#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */\r
+\r
+void PNGAPI\r
+png_set_compression_level(png_structp png_ptr, int level)\r
+{\r
+ png_debug(1, "in png_set_compression_level\n");\r
+ if (png_ptr == NULL)\r
+ return;\r
+ png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;\r
+ png_ptr->zlib_level = level;\r
+}\r
+\r
+void PNGAPI\r
+png_set_compression_mem_level(png_structp png_ptr, int mem_level)\r
+{\r
+ png_debug(1, "in png_set_compression_mem_level\n");\r
+ if (png_ptr == NULL)\r
+ return;\r
+ png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;\r
+ png_ptr->zlib_mem_level = mem_level;\r
+}\r
+\r
+void PNGAPI\r
+png_set_compression_strategy(png_structp png_ptr, int strategy)\r
+{\r
+ png_debug(1, "in png_set_compression_strategy\n");\r
+ if (png_ptr == NULL)\r
+ return;\r
+ png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;\r
+ png_ptr->zlib_strategy = strategy;\r
+}\r
+\r
+void PNGAPI\r
+png_set_compression_window_bits(png_structp png_ptr, int window_bits)\r
+{\r
+ if (png_ptr == NULL)\r
+ return;\r
+ if (window_bits > 15)\r
+ png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");\r
+ else if (window_bits < 8)\r
+ png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");\r
+#ifndef WBITS_8_OK\r
+ /* avoid libpng bug with 256-byte windows */\r
+ if (window_bits == 8)\r
+ {\r
+ png_warning(png_ptr, "Compression window is being reset to 512");\r
+ window_bits=9;\r
+ }\r
+#endif\r
+ png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;\r
+ png_ptr->zlib_window_bits = window_bits;\r
+}\r
+\r
+void PNGAPI\r
+png_set_compression_method(png_structp png_ptr, int method)\r
+{\r
+ png_debug(1, "in png_set_compression_method\n");\r
+ if (png_ptr == NULL)\r
+ return;\r
+ if (method != 8)\r
+ png_warning(png_ptr, "Only compression method 8 is supported by PNG");\r
+ png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD;\r
+ png_ptr->zlib_method = method;\r
+}\r
+\r
+void PNGAPI\r
+png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)\r
+{\r
+ if (png_ptr == NULL)\r
+ return;\r
+ png_ptr->write_row_fn = write_row_fn;\r
+}\r
+\r
+#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)\r
+void PNGAPI\r
+png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr\r
+ write_user_transform_fn)\r
+{\r
+ png_debug(1, "in png_set_write_user_transform_fn\n");\r
+ if (png_ptr == NULL)\r
+ return;\r
+ png_ptr->transformations |= PNG_USER_TRANSFORM;\r
+ png_ptr->write_user_transform_fn = write_user_transform_fn;\r
+}\r
+#endif\r
+\r
+\r
+#if defined(PNG_INFO_IMAGE_SUPPORTED)\r
+void PNGAPI\r
+png_write_png(png_structp png_ptr, png_infop info_ptr,\r
+ int transforms, voidp params)\r
+{\r
+ if (png_ptr == NULL || info_ptr == NULL)\r
+ return;\r
+#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)\r
+ /* invert the alpha channel from opacity to transparency */\r
+ if (transforms & PNG_TRANSFORM_INVERT_ALPHA)\r
+ png_set_invert_alpha(png_ptr);\r
+#endif\r
+\r
+ /* Write the file header information. */\r
+ png_write_info(png_ptr, info_ptr);\r
+\r
+ /* ------ these transformations don't touch the info structure ------- */\r
+\r
+#if defined(PNG_WRITE_INVERT_SUPPORTED)\r
+ /* invert monochrome pixels */\r
+ if (transforms & PNG_TRANSFORM_INVERT_MONO)\r
+ png_set_invert_mono(png_ptr);\r
+#endif\r
+\r
+#if defined(PNG_WRITE_SHIFT_SUPPORTED)\r
+ /* Shift the pixels up to a legal bit depth and fill in\r
+ * as appropriate to correctly scale the image.\r
+ */\r
+ if ((transforms & PNG_TRANSFORM_SHIFT)\r
+ && (info_ptr->valid & PNG_INFO_sBIT))\r
+ png_set_shift(png_ptr, &info_ptr->sig_bit);\r
+#endif\r
+\r
+#if defined(PNG_WRITE_PACK_SUPPORTED)\r
+ /* pack pixels into bytes */\r
+ if (transforms & PNG_TRANSFORM_PACKING)\r
+ png_set_packing(png_ptr);\r
+#endif\r
+\r
+#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)\r
+ /* swap location of alpha bytes from ARGB to RGBA */\r
+ if (transforms & PNG_TRANSFORM_SWAP_ALPHA)\r
+ png_set_swap_alpha(png_ptr);\r
+#endif\r
+\r
+#if defined(PNG_WRITE_FILLER_SUPPORTED)\r
+ /* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into\r
+ * RGB (4 channels -> 3 channels). The second parameter is not used.\r
+ */\r
+ if (transforms & PNG_TRANSFORM_STRIP_FILLER)\r
+ png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);\r
+#endif\r
+\r
+#if defined(PNG_WRITE_BGR_SUPPORTED)\r
+ /* flip BGR pixels to RGB */\r
+ if (transforms & PNG_TRANSFORM_BGR)\r
+ png_set_bgr(png_ptr);\r
+#endif\r
+\r
+#if defined(PNG_WRITE_SWAP_SUPPORTED)\r
+ /* swap bytes of 16-bit files to most significant byte first */\r
+ if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)\r
+ png_set_swap(png_ptr);\r
+#endif\r
+\r
+#if defined(PNG_WRITE_PACKSWAP_SUPPORTED)\r
+ /* swap bits of 1, 2, 4 bit packed pixel formats */\r
+ if (transforms & PNG_TRANSFORM_PACKSWAP)\r
+ png_set_packswap(png_ptr);\r
+#endif\r
+\r
+ /* ----------------------- end of transformations ------------------- */\r
+\r
+ /* write the bits */\r
+ if (info_ptr->valid & PNG_INFO_IDAT)\r
+ png_write_image(png_ptr, info_ptr->row_pointers);\r
+\r
+ /* It is REQUIRED to call this to finish writing the rest of the file */\r
+ png_write_end(png_ptr, info_ptr);\r
+\r
+ transforms = transforms; /* quiet compiler warnings */\r
+ params = params;\r
+}\r
+#endif\r
+#endif /* PNG_WRITE_SUPPORTED */\r
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