2 /* pngwrite.c - general routines to write a PNG file
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4 * Last changed in libpng 1.2.31 [August 19, 2008]
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5 * For conditions of distribution and use, see copyright notice in png.h
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6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
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7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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11 /* get internal access to png.h */
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12 #define PNG_INTERNAL
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14 #ifdef PNG_WRITE_SUPPORTED
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16 /* Writes all the PNG information. This is the suggested way to use the
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17 * library. If you have a new chunk to add, make a function to write it,
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18 * and put it in the correct location here. If you want the chunk written
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19 * after the image data, put it in png_write_end(). I strongly encourage
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20 * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing
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21 * the chunk, as that will keep the code from breaking if you want to just
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22 * write a plain PNG file. If you have long comments, I suggest writing
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23 * them in png_write_end(), and compressing them.
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26 png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
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28 png_debug(1, "in png_write_info_before_PLTE\n");
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29 if (png_ptr == NULL || info_ptr == NULL)
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31 if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
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33 png_write_sig(png_ptr); /* write PNG signature */
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34 #if defined(PNG_MNG_FEATURES_SUPPORTED)
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35 if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&(png_ptr->mng_features_permitted))
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37 png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
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38 png_ptr->mng_features_permitted=0;
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41 /* write IHDR information. */
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42 png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
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43 info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
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44 info_ptr->filter_type,
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45 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
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46 info_ptr->interlace_type);
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50 /* the rest of these check to see if the valid field has the appropriate
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51 flag set, and if it does, writes the chunk. */
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52 #if defined(PNG_WRITE_gAMA_SUPPORTED)
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53 if (info_ptr->valid & PNG_INFO_gAMA)
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55 # ifdef PNG_FLOATING_POINT_SUPPORTED
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56 png_write_gAMA(png_ptr, info_ptr->gamma);
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58 #ifdef PNG_FIXED_POINT_SUPPORTED
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59 png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
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64 #if defined(PNG_WRITE_sRGB_SUPPORTED)
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65 if (info_ptr->valid & PNG_INFO_sRGB)
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66 png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
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68 #if defined(PNG_WRITE_iCCP_SUPPORTED)
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69 if (info_ptr->valid & PNG_INFO_iCCP)
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70 png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
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71 info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
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73 #if defined(PNG_WRITE_sBIT_SUPPORTED)
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74 if (info_ptr->valid & PNG_INFO_sBIT)
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75 png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
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77 #if defined(PNG_WRITE_cHRM_SUPPORTED)
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78 if (info_ptr->valid & PNG_INFO_cHRM)
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80 #ifdef PNG_FLOATING_POINT_SUPPORTED
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81 png_write_cHRM(png_ptr,
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82 info_ptr->x_white, info_ptr->y_white,
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83 info_ptr->x_red, info_ptr->y_red,
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84 info_ptr->x_green, info_ptr->y_green,
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85 info_ptr->x_blue, info_ptr->y_blue);
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87 # ifdef PNG_FIXED_POINT_SUPPORTED
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88 png_write_cHRM_fixed(png_ptr,
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89 info_ptr->int_x_white, info_ptr->int_y_white,
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90 info_ptr->int_x_red, info_ptr->int_y_red,
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91 info_ptr->int_x_green, info_ptr->int_y_green,
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92 info_ptr->int_x_blue, info_ptr->int_y_blue);
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97 #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
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98 if (info_ptr->unknown_chunks_num)
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100 png_unknown_chunk *up;
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102 png_debug(5, "writing extra chunks\n");
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104 for (up = info_ptr->unknown_chunks;
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105 up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
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108 int keep=png_handle_as_unknown(png_ptr, up->name);
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109 if (keep != PNG_HANDLE_CHUNK_NEVER &&
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110 up->location && !(up->location & PNG_HAVE_PLTE) &&
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111 !(up->location & PNG_HAVE_IDAT) &&
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112 ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
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113 (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
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116 png_warning(png_ptr, "Writing zero-length unknown chunk");
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117 png_write_chunk(png_ptr, up->name, up->data, up->size);
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122 png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
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127 png_write_info(png_structp png_ptr, png_infop info_ptr)
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129 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
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133 png_debug(1, "in png_write_info\n");
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135 if (png_ptr == NULL || info_ptr == NULL)
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138 png_write_info_before_PLTE(png_ptr, info_ptr);
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140 if (info_ptr->valid & PNG_INFO_PLTE)
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141 png_write_PLTE(png_ptr, info_ptr->palette,
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142 (png_uint_32)info_ptr->num_palette);
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143 else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
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144 png_error(png_ptr, "Valid palette required for paletted images");
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146 #if defined(PNG_WRITE_tRNS_SUPPORTED)
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147 if (info_ptr->valid & PNG_INFO_tRNS)
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149 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
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150 /* invert the alpha channel (in tRNS) */
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151 if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
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152 info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
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155 for (j=0; j<(int)info_ptr->num_trans; j++)
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156 info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
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159 png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
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160 info_ptr->num_trans, info_ptr->color_type);
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163 #if defined(PNG_WRITE_bKGD_SUPPORTED)
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164 if (info_ptr->valid & PNG_INFO_bKGD)
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165 png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
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167 #if defined(PNG_WRITE_hIST_SUPPORTED)
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168 if (info_ptr->valid & PNG_INFO_hIST)
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169 png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
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171 #if defined(PNG_WRITE_oFFs_SUPPORTED)
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172 if (info_ptr->valid & PNG_INFO_oFFs)
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173 png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,
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174 info_ptr->offset_unit_type);
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176 #if defined(PNG_WRITE_pCAL_SUPPORTED)
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177 if (info_ptr->valid & PNG_INFO_pCAL)
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178 png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
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179 info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
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180 info_ptr->pcal_units, info_ptr->pcal_params);
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182 #if defined(PNG_WRITE_sCAL_SUPPORTED)
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183 if (info_ptr->valid & PNG_INFO_sCAL)
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184 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
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185 png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
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186 info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
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188 #ifdef PNG_FIXED_POINT_SUPPORTED
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189 png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
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190 info_ptr->scal_s_width, info_ptr->scal_s_height);
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192 png_warning(png_ptr,
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193 "png_write_sCAL not supported; sCAL chunk not written.");
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197 #if defined(PNG_WRITE_pHYs_SUPPORTED)
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198 if (info_ptr->valid & PNG_INFO_pHYs)
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199 png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
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200 info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
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202 #if defined(PNG_WRITE_tIME_SUPPORTED)
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203 if (info_ptr->valid & PNG_INFO_tIME)
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205 png_write_tIME(png_ptr, &(info_ptr->mod_time));
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206 png_ptr->mode |= PNG_WROTE_tIME;
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209 #if defined(PNG_WRITE_sPLT_SUPPORTED)
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210 if (info_ptr->valid & PNG_INFO_sPLT)
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211 for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
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212 png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
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214 #if defined(PNG_WRITE_TEXT_SUPPORTED)
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215 /* Check to see if we need to write text chunks */
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216 for (i = 0; i < info_ptr->num_text; i++)
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218 png_debug2(2, "Writing header text chunk %d, type %d\n", i,
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219 info_ptr->text[i].compression);
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220 /* an internationalized chunk? */
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221 if (info_ptr->text[i].compression > 0)
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223 #if defined(PNG_WRITE_iTXt_SUPPORTED)
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224 /* write international chunk */
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225 png_write_iTXt(png_ptr,
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226 info_ptr->text[i].compression,
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227 info_ptr->text[i].key,
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228 info_ptr->text[i].lang,
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229 info_ptr->text[i].lang_key,
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230 info_ptr->text[i].text);
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232 png_warning(png_ptr, "Unable to write international text");
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234 /* Mark this chunk as written */
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235 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
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237 /* If we want a compressed text chunk */
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238 else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
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240 #if defined(PNG_WRITE_zTXt_SUPPORTED)
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241 /* write compressed chunk */
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242 png_write_zTXt(png_ptr, info_ptr->text[i].key,
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243 info_ptr->text[i].text, 0,
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244 info_ptr->text[i].compression);
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246 png_warning(png_ptr, "Unable to write compressed text");
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248 /* Mark this chunk as written */
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249 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
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251 else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
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253 #if defined(PNG_WRITE_tEXt_SUPPORTED)
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254 /* write uncompressed chunk */
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255 png_write_tEXt(png_ptr, info_ptr->text[i].key,
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256 info_ptr->text[i].text,
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259 png_warning(png_ptr, "Unable to write uncompressed text");
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261 /* Mark this chunk as written */
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262 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
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266 #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
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267 if (info_ptr->unknown_chunks_num)
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269 png_unknown_chunk *up;
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271 png_debug(5, "writing extra chunks\n");
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273 for (up = info_ptr->unknown_chunks;
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274 up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
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277 int keep=png_handle_as_unknown(png_ptr, up->name);
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278 if (keep != PNG_HANDLE_CHUNK_NEVER &&
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279 up->location && (up->location & PNG_HAVE_PLTE) &&
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280 !(up->location & PNG_HAVE_IDAT) &&
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281 ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
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282 (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
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284 png_write_chunk(png_ptr, up->name, up->data, up->size);
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291 /* Writes the end of the PNG file. If you don't want to write comments or
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292 * time information, you can pass NULL for info. If you already wrote these
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293 * in png_write_info(), do not write them again here. If you have long
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294 * comments, I suggest writing them here, and compressing them.
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297 png_write_end(png_structp png_ptr, png_infop info_ptr)
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299 png_debug(1, "in png_write_end\n");
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300 if (png_ptr == NULL)
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302 if (!(png_ptr->mode & PNG_HAVE_IDAT))
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303 png_error(png_ptr, "No IDATs written into file");
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305 /* see if user wants us to write information chunks */
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306 if (info_ptr != NULL)
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308 #if defined(PNG_WRITE_TEXT_SUPPORTED)
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309 int i; /* local index variable */
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311 #if defined(PNG_WRITE_tIME_SUPPORTED)
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312 /* check to see if user has supplied a time chunk */
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313 if ((info_ptr->valid & PNG_INFO_tIME) &&
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314 !(png_ptr->mode & PNG_WROTE_tIME))
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315 png_write_tIME(png_ptr, &(info_ptr->mod_time));
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317 #if defined(PNG_WRITE_TEXT_SUPPORTED)
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318 /* loop through comment chunks */
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319 for (i = 0; i < info_ptr->num_text; i++)
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321 png_debug2(2, "Writing trailer text chunk %d, type %d\n", i,
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322 info_ptr->text[i].compression);
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323 /* an internationalized chunk? */
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324 if (info_ptr->text[i].compression > 0)
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326 #if defined(PNG_WRITE_iTXt_SUPPORTED)
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327 /* write international chunk */
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328 png_write_iTXt(png_ptr,
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329 info_ptr->text[i].compression,
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330 info_ptr->text[i].key,
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331 info_ptr->text[i].lang,
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332 info_ptr->text[i].lang_key,
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333 info_ptr->text[i].text);
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335 png_warning(png_ptr, "Unable to write international text");
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337 /* Mark this chunk as written */
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338 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
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340 else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
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342 #if defined(PNG_WRITE_zTXt_SUPPORTED)
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343 /* write compressed chunk */
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344 png_write_zTXt(png_ptr, info_ptr->text[i].key,
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345 info_ptr->text[i].text, 0,
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346 info_ptr->text[i].compression);
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348 png_warning(png_ptr, "Unable to write compressed text");
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350 /* Mark this chunk as written */
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351 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
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353 else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
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355 #if defined(PNG_WRITE_tEXt_SUPPORTED)
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356 /* write uncompressed chunk */
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357 png_write_tEXt(png_ptr, info_ptr->text[i].key,
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358 info_ptr->text[i].text, 0);
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360 png_warning(png_ptr, "Unable to write uncompressed text");
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363 /* Mark this chunk as written */
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364 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
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368 #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
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369 if (info_ptr->unknown_chunks_num)
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371 png_unknown_chunk *up;
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373 png_debug(5, "writing extra chunks\n");
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375 for (up = info_ptr->unknown_chunks;
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376 up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
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379 int keep=png_handle_as_unknown(png_ptr, up->name);
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380 if (keep != PNG_HANDLE_CHUNK_NEVER &&
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381 up->location && (up->location & PNG_AFTER_IDAT) &&
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382 ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
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383 (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
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385 png_write_chunk(png_ptr, up->name, up->data, up->size);
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392 png_ptr->mode |= PNG_AFTER_IDAT;
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394 /* write end of PNG file */
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395 png_write_IEND(png_ptr);
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396 /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03,
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397 * and restored again in libpng-1.2.30, may cause some applications that
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398 * do not set png_ptr->output_flush_fn to crash. If your application
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399 * experiences a problem, please try building libpng with
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400 * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to
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401 * png-mng-implement at lists.sf.net . This kludge will be removed
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402 * from libpng-1.4.0.
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404 #if defined(PNG_WRITE_FLUSH_SUPPORTED) && \
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405 defined(PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED)
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406 png_flush(png_ptr);
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410 #if defined(PNG_WRITE_tIME_SUPPORTED)
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411 #if !defined(_WIN32_WCE)
\r
412 /* "time.h" functions are not supported on WindowsCE */
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414 png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
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416 png_debug(1, "in png_convert_from_struct_tm\n");
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417 ptime->year = (png_uint_16)(1900 + ttime->tm_year);
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418 ptime->month = (png_byte)(ttime->tm_mon + 1);
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419 ptime->day = (png_byte)ttime->tm_mday;
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420 ptime->hour = (png_byte)ttime->tm_hour;
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421 ptime->minute = (png_byte)ttime->tm_min;
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422 ptime->second = (png_byte)ttime->tm_sec;
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426 png_convert_from_time_t(png_timep ptime, time_t ttime)
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430 png_debug(1, "in png_convert_from_time_t\n");
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431 tbuf = gmtime(&ttime);
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432 png_convert_from_struct_tm(ptime, tbuf);
\r
437 /* Initialize png_ptr structure, and allocate any memory needed */
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439 png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
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440 png_error_ptr error_fn, png_error_ptr warn_fn)
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442 #ifdef PNG_USER_MEM_SUPPORTED
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443 return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
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444 warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
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447 /* Alternate initialize png_ptr structure, and allocate any memory needed */
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449 png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
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450 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
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451 png_malloc_ptr malloc_fn, png_free_ptr free_fn)
\r
453 #endif /* PNG_USER_MEM_SUPPORTED */
\r
454 #ifdef PNG_SETJMP_SUPPORTED
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457 png_structp png_ptr;
\r
458 #ifdef PNG_SETJMP_SUPPORTED
\r
459 #ifdef USE_FAR_KEYWORD
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464 png_debug(1, "in png_create_write_struct\n");
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465 #ifdef PNG_USER_MEM_SUPPORTED
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466 png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
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467 (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
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469 png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
\r
470 #endif /* PNG_USER_MEM_SUPPORTED */
\r
471 if (png_ptr == NULL)
\r
474 /* added at libpng-1.2.6 */
\r
475 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
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476 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
\r
477 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
\r
480 #ifdef PNG_SETJMP_SUPPORTED
\r
481 #ifdef USE_FAR_KEYWORD
\r
482 if (setjmp(jmpbuf))
\r
484 if (setjmp(png_ptr->jmpbuf))
\r
487 png_free(png_ptr, png_ptr->zbuf);
\r
488 png_ptr->zbuf=NULL;
\r
489 png_destroy_struct(png_ptr);
\r
492 #ifdef USE_FAR_KEYWORD
\r
493 png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
\r
497 #ifdef PNG_USER_MEM_SUPPORTED
\r
498 png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
\r
499 #endif /* PNG_USER_MEM_SUPPORTED */
\r
500 png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
\r
507 if (user_png_ver[i] != png_libpng_ver[i])
\r
508 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
\r
509 } while (png_libpng_ver[i++]);
\r
512 if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
\r
514 /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
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515 * we must recompile any applications that use any older library version.
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516 * For versions after libpng 1.0, we will be compatible, so we need
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517 * only check the first digit.
\r
519 if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
\r
520 (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
\r
521 (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
\r
523 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
\r
527 png_snprintf(msg, 80,
\r
528 "Application was compiled with png.h from libpng-%.20s",
\r
530 png_warning(png_ptr, msg);
\r
532 png_snprintf(msg, 80,
\r
533 "Application is running with png.c from libpng-%.20s",
\r
535 png_warning(png_ptr, msg);
\r
537 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
\r
541 "Incompatible libpng version in application and library");
\r
545 /* initialize zbuf - compression buffer */
\r
546 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
\r
547 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
\r
548 (png_uint_32)png_ptr->zbuf_size);
\r
550 png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
\r
551 png_flush_ptr_NULL);
\r
553 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
\r
554 png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
\r
555 1, png_doublep_NULL, png_doublep_NULL);
\r
558 #ifdef PNG_SETJMP_SUPPORTED
\r
559 /* Applications that neglect to set up their own setjmp() and then encounter
\r
560 a png_error() will longjmp here. Since the jmpbuf is then meaningless we
\r
561 abort instead of returning. */
\r
562 #ifdef USE_FAR_KEYWORD
\r
563 if (setjmp(jmpbuf))
\r
565 png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
\r
567 if (setjmp(png_ptr->jmpbuf))
\r
574 /* Initialize png_ptr structure, and allocate any memory needed */
\r
575 #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
\r
577 #undef png_write_init
\r
579 png_write_init(png_structp png_ptr)
\r
581 /* We only come here via pre-1.0.7-compiled applications */
\r
582 png_write_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
\r
586 png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
\r
587 png_size_t png_struct_size, png_size_t png_info_size)
\r
589 /* We only come here via pre-1.0.12-compiled applications */
\r
590 if (png_ptr == NULL) return;
\r
591 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
\r
592 if (png_sizeof(png_struct) > png_struct_size ||
\r
593 png_sizeof(png_info) > png_info_size)
\r
596 png_ptr->warning_fn=NULL;
\r
599 png_snprintf(msg, 80,
\r
600 "Application was compiled with png.h from libpng-%.20s",
\r
602 png_warning(png_ptr, msg);
\r
604 png_snprintf(msg, 80,
\r
605 "Application is running with png.c from libpng-%.20s",
\r
607 png_warning(png_ptr, msg);
\r
610 if (png_sizeof(png_struct) > png_struct_size)
\r
612 png_ptr->error_fn=NULL;
\r
613 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
\r
617 "The png struct allocated by the application for writing is too small.");
\r
619 if (png_sizeof(png_info) > png_info_size)
\r
621 png_ptr->error_fn=NULL;
\r
622 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
\r
626 "The info struct allocated by the application for writing is too small.");
\r
628 png_write_init_3(&png_ptr, user_png_ver, png_struct_size);
\r
630 #endif /* PNG_1_0_X || PNG_1_2_X */
\r
634 png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
\r
635 png_size_t png_struct_size)
\r
637 png_structp png_ptr=*ptr_ptr;
\r
638 #ifdef PNG_SETJMP_SUPPORTED
\r
639 jmp_buf tmp_jmp; /* to save current jump buffer */
\r
644 if (png_ptr == NULL)
\r
649 if (user_png_ver[i] != png_libpng_ver[i])
\r
651 #ifdef PNG_LEGACY_SUPPORTED
\r
652 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
\r
654 png_ptr->warning_fn=NULL;
\r
655 png_warning(png_ptr,
\r
656 "Application uses deprecated png_write_init() and should be recompiled.");
\r
660 } while (png_libpng_ver[i++]);
\r
662 png_debug(1, "in png_write_init_3\n");
\r
664 #ifdef PNG_SETJMP_SUPPORTED
\r
665 /* save jump buffer and error functions */
\r
666 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
\r
669 if (png_sizeof(png_struct) > png_struct_size)
\r
671 png_destroy_struct(png_ptr);
\r
672 png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
\r
673 *ptr_ptr = png_ptr;
\r
676 /* reset all variables to 0 */
\r
677 png_memset(png_ptr, 0, png_sizeof(png_struct));
\r
679 /* added at libpng-1.2.6 */
\r
680 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
\r
681 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
\r
682 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
\r
685 #ifdef PNG_SETJMP_SUPPORTED
\r
686 /* restore jump buffer */
\r
687 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
\r
690 png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
\r
691 png_flush_ptr_NULL);
\r
693 /* initialize zbuf - compression buffer */
\r
694 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
\r
695 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
\r
696 (png_uint_32)png_ptr->zbuf_size);
\r
698 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
\r
699 png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
\r
700 1, png_doublep_NULL, png_doublep_NULL);
\r
704 /* Write a few rows of image data. If the image is interlaced,
\r
705 * either you will have to write the 7 sub images, or, if you
\r
706 * have called png_set_interlace_handling(), you will have to
\r
707 * "write" the image seven times.
\r
710 png_write_rows(png_structp png_ptr, png_bytepp row,
\r
711 png_uint_32 num_rows)
\r
713 png_uint_32 i; /* row counter */
\r
714 png_bytepp rp; /* row pointer */
\r
716 png_debug(1, "in png_write_rows\n");
\r
718 if (png_ptr == NULL)
\r
721 /* loop through the rows */
\r
722 for (i = 0, rp = row; i < num_rows; i++, rp++)
\r
724 png_write_row(png_ptr, *rp);
\r
728 /* Write the image. You only need to call this function once, even
\r
729 * if you are writing an interlaced image.
\r
732 png_write_image(png_structp png_ptr, png_bytepp image)
\r
734 png_uint_32 i; /* row index */
\r
735 int pass, num_pass; /* pass variables */
\r
736 png_bytepp rp; /* points to current row */
\r
738 if (png_ptr == NULL)
\r
741 png_debug(1, "in png_write_image\n");
\r
742 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
\r
743 /* intialize interlace handling. If image is not interlaced,
\r
744 this will set pass to 1 */
\r
745 num_pass = png_set_interlace_handling(png_ptr);
\r
749 /* loop through passes */
\r
750 for (pass = 0; pass < num_pass; pass++)
\r
752 /* loop through image */
\r
753 for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
\r
755 png_write_row(png_ptr, *rp);
\r
760 /* called by user to write a row of image data */
\r
762 png_write_row(png_structp png_ptr, png_bytep row)
\r
764 if (png_ptr == NULL)
\r
766 png_debug2(1, "in png_write_row (row %ld, pass %d)\n",
\r
767 png_ptr->row_number, png_ptr->pass);
\r
769 /* initialize transformations and other stuff if first time */
\r
770 if (png_ptr->row_number == 0 && png_ptr->pass == 0)
\r
772 /* make sure we wrote the header info */
\r
773 if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
\r
775 "png_write_info was never called before png_write_row.");
\r
777 /* check for transforms that have been set but were defined out */
\r
778 #if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
\r
779 if (png_ptr->transformations & PNG_INVERT_MONO)
\r
780 png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined.");
\r
782 #if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
\r
783 if (png_ptr->transformations & PNG_FILLER)
\r
784 png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined.");
\r
786 #if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && defined(PNG_READ_PACKSWAP_SUPPORTED)
\r
787 if (png_ptr->transformations & PNG_PACKSWAP)
\r
788 png_warning(png_ptr, "PNG_WRITE_PACKSWAP_SUPPORTED is not defined.");
\r
790 #if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
\r
791 if (png_ptr->transformations & PNG_PACK)
\r
792 png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined.");
\r
794 #if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
\r
795 if (png_ptr->transformations & PNG_SHIFT)
\r
796 png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined.");
\r
798 #if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
\r
799 if (png_ptr->transformations & PNG_BGR)
\r
800 png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined.");
\r
802 #if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
\r
803 if (png_ptr->transformations & PNG_SWAP_BYTES)
\r
804 png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");
\r
807 png_write_start_row(png_ptr);
\r
810 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
\r
811 /* if interlaced and not interested in row, return */
\r
812 if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
\r
814 switch (png_ptr->pass)
\r
817 if (png_ptr->row_number & 0x07)
\r
819 png_write_finish_row(png_ptr);
\r
824 if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
\r
826 png_write_finish_row(png_ptr);
\r
831 if ((png_ptr->row_number & 0x07) != 4)
\r
833 png_write_finish_row(png_ptr);
\r
838 if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
\r
840 png_write_finish_row(png_ptr);
\r
845 if ((png_ptr->row_number & 0x03) != 2)
\r
847 png_write_finish_row(png_ptr);
\r
852 if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
\r
854 png_write_finish_row(png_ptr);
\r
859 if (!(png_ptr->row_number & 0x01))
\r
861 png_write_finish_row(png_ptr);
\r
869 /* set up row info for transformations */
\r
870 png_ptr->row_info.color_type = png_ptr->color_type;
\r
871 png_ptr->row_info.width = png_ptr->usr_width;
\r
872 png_ptr->row_info.channels = png_ptr->usr_channels;
\r
873 png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth;
\r
874 png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
\r
875 png_ptr->row_info.channels);
\r
877 png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
\r
878 png_ptr->row_info.width);
\r
880 png_debug1(3, "row_info->color_type = %d\n", png_ptr->row_info.color_type);
\r
881 png_debug1(3, "row_info->width = %lu\n", png_ptr->row_info.width);
\r
882 png_debug1(3, "row_info->channels = %d\n", png_ptr->row_info.channels);
\r
883 png_debug1(3, "row_info->bit_depth = %d\n", png_ptr->row_info.bit_depth);
\r
884 png_debug1(3, "row_info->pixel_depth = %d\n", png_ptr->row_info.pixel_depth);
\r
885 png_debug1(3, "row_info->rowbytes = %lu\n", png_ptr->row_info.rowbytes);
\r
887 /* Copy user's row into buffer, leaving room for filter byte. */
\r
888 png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,
\r
889 png_ptr->row_info.rowbytes);
\r
891 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
\r
892 /* handle interlacing */
\r
893 if (png_ptr->interlaced && png_ptr->pass < 6 &&
\r
894 (png_ptr->transformations & PNG_INTERLACE))
\r
896 png_do_write_interlace(&(png_ptr->row_info),
\r
897 png_ptr->row_buf + 1, png_ptr->pass);
\r
898 /* this should always get caught above, but still ... */
\r
899 if (!(png_ptr->row_info.width))
\r
901 png_write_finish_row(png_ptr);
\r
907 /* handle other transformations */
\r
908 if (png_ptr->transformations)
\r
909 png_do_write_transformations(png_ptr);
\r
911 #if defined(PNG_MNG_FEATURES_SUPPORTED)
\r
912 /* Write filter_method 64 (intrapixel differencing) only if
\r
913 * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
\r
914 * 2. Libpng did not write a PNG signature (this filter_method is only
\r
915 * used in PNG datastreams that are embedded in MNG datastreams) and
\r
916 * 3. The application called png_permit_mng_features with a mask that
\r
917 * included PNG_FLAG_MNG_FILTER_64 and
\r
918 * 4. The filter_method is 64 and
\r
919 * 5. The color_type is RGB or RGBA
\r
921 if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
\r
922 (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
\r
924 /* Intrapixel differencing */
\r
925 png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
\r
929 /* Find a filter if necessary, filter the row and write it out. */
\r
930 png_write_find_filter(png_ptr, &(png_ptr->row_info));
\r
932 if (png_ptr->write_row_fn != NULL)
\r
933 (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
\r
936 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
\r
937 /* Set the automatic flush interval or 0 to turn flushing off */
\r
939 png_set_flush(png_structp png_ptr, int nrows)
\r
941 png_debug(1, "in png_set_flush\n");
\r
942 if (png_ptr == NULL)
\r
944 png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
\r
947 /* flush the current output buffers now */
\r
949 png_write_flush(png_structp png_ptr)
\r
953 png_debug(1, "in png_write_flush\n");
\r
954 if (png_ptr == NULL)
\r
956 /* We have already written out all of the data */
\r
957 if (png_ptr->row_number >= png_ptr->num_rows)
\r
964 /* compress the data */
\r
965 ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);
\r
968 /* check for compression errors */
\r
971 if (png_ptr->zstream.msg != NULL)
\r
972 png_error(png_ptr, png_ptr->zstream.msg);
\r
974 png_error(png_ptr, "zlib error");
\r
977 if (!(png_ptr->zstream.avail_out))
\r
979 /* write the IDAT and reset the zlib output buffer */
\r
980 png_write_IDAT(png_ptr, png_ptr->zbuf,
\r
981 png_ptr->zbuf_size);
\r
982 png_ptr->zstream.next_out = png_ptr->zbuf;
\r
983 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
\r
986 } while(wrote_IDAT == 1);
\r
988 /* If there is any data left to be output, write it into a new IDAT */
\r
989 if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
\r
991 /* write the IDAT and reset the zlib output buffer */
\r
992 png_write_IDAT(png_ptr, png_ptr->zbuf,
\r
993 png_ptr->zbuf_size - png_ptr->zstream.avail_out);
\r
994 png_ptr->zstream.next_out = png_ptr->zbuf;
\r
995 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
\r
997 png_ptr->flush_rows = 0;
\r
998 png_flush(png_ptr);
\r
1000 #endif /* PNG_WRITE_FLUSH_SUPPORTED */
\r
1002 /* free all memory used by the write */
\r
1004 png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
\r
1006 png_structp png_ptr = NULL;
\r
1007 png_infop info_ptr = NULL;
\r
1008 #ifdef PNG_USER_MEM_SUPPORTED
\r
1009 png_free_ptr free_fn = NULL;
\r
1010 png_voidp mem_ptr = NULL;
\r
1013 png_debug(1, "in png_destroy_write_struct\n");
\r
1014 if (png_ptr_ptr != NULL)
\r
1016 png_ptr = *png_ptr_ptr;
\r
1017 #ifdef PNG_USER_MEM_SUPPORTED
\r
1018 free_fn = png_ptr->free_fn;
\r
1019 mem_ptr = png_ptr->mem_ptr;
\r
1023 #ifdef PNG_USER_MEM_SUPPORTED
\r
1024 if (png_ptr != NULL)
\r
1026 free_fn = png_ptr->free_fn;
\r
1027 mem_ptr = png_ptr->mem_ptr;
\r
1031 if (info_ptr_ptr != NULL)
\r
1032 info_ptr = *info_ptr_ptr;
\r
1034 if (info_ptr != NULL)
\r
1036 if (png_ptr != NULL)
\r
1038 png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
\r
1040 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
\r
1041 if (png_ptr->num_chunk_list)
\r
1043 png_free(png_ptr, png_ptr->chunk_list);
\r
1044 png_ptr->chunk_list=NULL;
\r
1045 png_ptr->num_chunk_list = 0;
\r
1050 #ifdef PNG_USER_MEM_SUPPORTED
\r
1051 png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
\r
1052 (png_voidp)mem_ptr);
\r
1054 png_destroy_struct((png_voidp)info_ptr);
\r
1056 *info_ptr_ptr = NULL;
\r
1059 if (png_ptr != NULL)
\r
1061 png_write_destroy(png_ptr);
\r
1062 #ifdef PNG_USER_MEM_SUPPORTED
\r
1063 png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
\r
1064 (png_voidp)mem_ptr);
\r
1066 png_destroy_struct((png_voidp)png_ptr);
\r
1068 *png_ptr_ptr = NULL;
\r
1073 /* Free any memory used in png_ptr struct (old method) */
\r
1074 void /* PRIVATE */
\r
1075 png_write_destroy(png_structp png_ptr)
\r
1077 #ifdef PNG_SETJMP_SUPPORTED
\r
1078 jmp_buf tmp_jmp; /* save jump buffer */
\r
1080 png_error_ptr error_fn;
\r
1081 png_error_ptr warning_fn;
\r
1082 png_voidp error_ptr;
\r
1083 #ifdef PNG_USER_MEM_SUPPORTED
\r
1084 png_free_ptr free_fn;
\r
1087 png_debug(1, "in png_write_destroy\n");
\r
1088 /* free any memory zlib uses */
\r
1089 deflateEnd(&png_ptr->zstream);
\r
1091 /* free our memory. png_free checks NULL for us. */
\r
1092 png_free(png_ptr, png_ptr->zbuf);
\r
1093 png_free(png_ptr, png_ptr->row_buf);
\r
1094 #ifndef PNG_NO_WRITE_FILTER
\r
1095 png_free(png_ptr, png_ptr->prev_row);
\r
1096 png_free(png_ptr, png_ptr->sub_row);
\r
1097 png_free(png_ptr, png_ptr->up_row);
\r
1098 png_free(png_ptr, png_ptr->avg_row);
\r
1099 png_free(png_ptr, png_ptr->paeth_row);
\r
1102 #if defined(PNG_TIME_RFC1123_SUPPORTED)
\r
1103 png_free(png_ptr, png_ptr->time_buffer);
\r
1106 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
\r
1107 png_free(png_ptr, png_ptr->prev_filters);
\r
1108 png_free(png_ptr, png_ptr->filter_weights);
\r
1109 png_free(png_ptr, png_ptr->inv_filter_weights);
\r
1110 png_free(png_ptr, png_ptr->filter_costs);
\r
1111 png_free(png_ptr, png_ptr->inv_filter_costs);
\r
1114 #ifdef PNG_SETJMP_SUPPORTED
\r
1115 /* reset structure */
\r
1116 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
\r
1119 error_fn = png_ptr->error_fn;
\r
1120 warning_fn = png_ptr->warning_fn;
\r
1121 error_ptr = png_ptr->error_ptr;
\r
1122 #ifdef PNG_USER_MEM_SUPPORTED
\r
1123 free_fn = png_ptr->free_fn;
\r
1126 png_memset(png_ptr, 0, png_sizeof(png_struct));
\r
1128 png_ptr->error_fn = error_fn;
\r
1129 png_ptr->warning_fn = warning_fn;
\r
1130 png_ptr->error_ptr = error_ptr;
\r
1131 #ifdef PNG_USER_MEM_SUPPORTED
\r
1132 png_ptr->free_fn = free_fn;
\r
1135 #ifdef PNG_SETJMP_SUPPORTED
\r
1136 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
\r
1140 /* Allow the application to select one or more row filters to use. */
\r
1142 png_set_filter(png_structp png_ptr, int method, int filters)
\r
1144 png_debug(1, "in png_set_filter\n");
\r
1145 if (png_ptr == NULL)
\r
1147 #if defined(PNG_MNG_FEATURES_SUPPORTED)
\r
1148 if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
\r
1149 (method == PNG_INTRAPIXEL_DIFFERENCING))
\r
1150 method = PNG_FILTER_TYPE_BASE;
\r
1152 if (method == PNG_FILTER_TYPE_BASE)
\r
1154 switch (filters & (PNG_ALL_FILTERS | 0x07))
\r
1156 #ifndef PNG_NO_WRITE_FILTER
\r
1159 case 7: png_warning(png_ptr, "Unknown row filter for method 0");
\r
1160 #endif /* PNG_NO_WRITE_FILTER */
\r
1161 case PNG_FILTER_VALUE_NONE:
\r
1162 png_ptr->do_filter=PNG_FILTER_NONE; break;
\r
1163 #ifndef PNG_NO_WRITE_FILTER
\r
1164 case PNG_FILTER_VALUE_SUB:
\r
1165 png_ptr->do_filter=PNG_FILTER_SUB; break;
\r
1166 case PNG_FILTER_VALUE_UP:
\r
1167 png_ptr->do_filter=PNG_FILTER_UP; break;
\r
1168 case PNG_FILTER_VALUE_AVG:
\r
1169 png_ptr->do_filter=PNG_FILTER_AVG; break;
\r
1170 case PNG_FILTER_VALUE_PAETH:
\r
1171 png_ptr->do_filter=PNG_FILTER_PAETH; break;
\r
1172 default: png_ptr->do_filter = (png_byte)filters; break;
\r
1174 default: png_warning(png_ptr, "Unknown row filter for method 0");
\r
1175 #endif /* PNG_NO_WRITE_FILTER */
\r
1178 /* If we have allocated the row_buf, this means we have already started
\r
1179 * with the image and we should have allocated all of the filter buffers
\r
1180 * that have been selected. If prev_row isn't already allocated, then
\r
1181 * it is too late to start using the filters that need it, since we
\r
1182 * will be missing the data in the previous row. If an application
\r
1183 * wants to start and stop using particular filters during compression,
\r
1184 * it should start out with all of the filters, and then add and
\r
1185 * remove them after the start of compression.
\r
1187 if (png_ptr->row_buf != NULL)
\r
1189 #ifndef PNG_NO_WRITE_FILTER
\r
1190 if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
\r
1192 png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
\r
1193 (png_ptr->rowbytes + 1));
\r
1194 png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
\r
1197 if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)
\r
1199 if (png_ptr->prev_row == NULL)
\r
1201 png_warning(png_ptr, "Can't add Up filter after starting");
\r
1202 png_ptr->do_filter &= ~PNG_FILTER_UP;
\r
1206 png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
\r
1207 (png_ptr->rowbytes + 1));
\r
1208 png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
\r
1212 if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
\r
1214 if (png_ptr->prev_row == NULL)
\r
1216 png_warning(png_ptr, "Can't add Average filter after starting");
\r
1217 png_ptr->do_filter &= ~PNG_FILTER_AVG;
\r
1221 png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
\r
1222 (png_ptr->rowbytes + 1));
\r
1223 png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
\r
1227 if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&
\r
1228 png_ptr->paeth_row == NULL)
\r
1230 if (png_ptr->prev_row == NULL)
\r
1232 png_warning(png_ptr, "Can't add Paeth filter after starting");
\r
1233 png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
\r
1237 png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
\r
1238 (png_ptr->rowbytes + 1));
\r
1239 png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
\r
1243 if (png_ptr->do_filter == PNG_NO_FILTERS)
\r
1244 #endif /* PNG_NO_WRITE_FILTER */
\r
1245 png_ptr->do_filter = PNG_FILTER_NONE;
\r
1249 png_error(png_ptr, "Unknown custom filter method");
\r
1252 /* This allows us to influence the way in which libpng chooses the "best"
\r
1253 * filter for the current scanline. While the "minimum-sum-of-absolute-
\r
1254 * differences metric is relatively fast and effective, there is some
\r
1255 * question as to whether it can be improved upon by trying to keep the
\r
1256 * filtered data going to zlib more consistent, hopefully resulting in
\r
1257 * better compression.
\r
1259 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* GRR 970116 */
\r
1261 png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
\r
1262 int num_weights, png_doublep filter_weights,
\r
1263 png_doublep filter_costs)
\r
1267 png_debug(1, "in png_set_filter_heuristics\n");
\r
1268 if (png_ptr == NULL)
\r
1270 if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)
\r
1272 png_warning(png_ptr, "Unknown filter heuristic method");
\r
1276 if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT)
\r
1278 heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
\r
1281 if (num_weights < 0 || filter_weights == NULL ||
\r
1282 heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
\r
1287 png_ptr->num_prev_filters = (png_byte)num_weights;
\r
1288 png_ptr->heuristic_method = (png_byte)heuristic_method;
\r
1290 if (num_weights > 0)
\r
1292 if (png_ptr->prev_filters == NULL)
\r
1294 png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
\r
1295 (png_uint_32)(png_sizeof(png_byte) * num_weights));
\r
1297 /* To make sure that the weighting starts out fairly */
\r
1298 for (i = 0; i < num_weights; i++)
\r
1300 png_ptr->prev_filters[i] = 255;
\r
1304 if (png_ptr->filter_weights == NULL)
\r
1306 png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
\r
1307 (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
\r
1309 png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
\r
1310 (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
\r
1311 for (i = 0; i < num_weights; i++)
\r
1313 png_ptr->inv_filter_weights[i] =
\r
1314 png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
\r
1318 for (i = 0; i < num_weights; i++)
\r
1320 if (filter_weights[i] < 0.0)
\r
1322 png_ptr->inv_filter_weights[i] =
\r
1323 png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
\r
1327 png_ptr->inv_filter_weights[i] =
\r
1328 (png_uint_16)((double)PNG_WEIGHT_FACTOR*filter_weights[i]+0.5);
\r
1329 png_ptr->filter_weights[i] =
\r
1330 (png_uint_16)((double)PNG_WEIGHT_FACTOR/filter_weights[i]+0.5);
\r
1335 /* If, in the future, there are other filter methods, this would
\r
1336 * need to be based on png_ptr->filter.
\r
1338 if (png_ptr->filter_costs == NULL)
\r
1340 png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
\r
1341 (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
\r
1343 png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
\r
1344 (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
\r
1346 for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
\r
1348 png_ptr->inv_filter_costs[i] =
\r
1349 png_ptr->filter_costs[i] = PNG_COST_FACTOR;
\r
1353 /* Here is where we set the relative costs of the different filters. We
\r
1354 * should take the desired compression level into account when setting
\r
1355 * the costs, so that Paeth, for instance, has a high relative cost at low
\r
1356 * compression levels, while it has a lower relative cost at higher
\r
1357 * compression settings. The filter types are in order of increasing
\r
1358 * relative cost, so it would be possible to do this with an algorithm.
\r
1360 for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
\r
1362 if (filter_costs == NULL || filter_costs[i] < 0.0)
\r
1364 png_ptr->inv_filter_costs[i] =
\r
1365 png_ptr->filter_costs[i] = PNG_COST_FACTOR;
\r
1367 else if (filter_costs[i] >= 1.0)
\r
1369 png_ptr->inv_filter_costs[i] =
\r
1370 (png_uint_16)((double)PNG_COST_FACTOR / filter_costs[i] + 0.5);
\r
1371 png_ptr->filter_costs[i] =
\r
1372 (png_uint_16)((double)PNG_COST_FACTOR * filter_costs[i] + 0.5);
\r
1376 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
\r
1379 png_set_compression_level(png_structp png_ptr, int level)
\r
1381 png_debug(1, "in png_set_compression_level\n");
\r
1382 if (png_ptr == NULL)
\r
1384 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
\r
1385 png_ptr->zlib_level = level;
\r
1389 png_set_compression_mem_level(png_structp png_ptr, int mem_level)
\r
1391 png_debug(1, "in png_set_compression_mem_level\n");
\r
1392 if (png_ptr == NULL)
\r
1394 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
\r
1395 png_ptr->zlib_mem_level = mem_level;
\r
1399 png_set_compression_strategy(png_structp png_ptr, int strategy)
\r
1401 png_debug(1, "in png_set_compression_strategy\n");
\r
1402 if (png_ptr == NULL)
\r
1404 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
\r
1405 png_ptr->zlib_strategy = strategy;
\r
1409 png_set_compression_window_bits(png_structp png_ptr, int window_bits)
\r
1411 if (png_ptr == NULL)
\r
1413 if (window_bits > 15)
\r
1414 png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
\r
1415 else if (window_bits < 8)
\r
1416 png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
\r
1417 #ifndef WBITS_8_OK
\r
1418 /* avoid libpng bug with 256-byte windows */
\r
1419 if (window_bits == 8)
\r
1421 png_warning(png_ptr, "Compression window is being reset to 512");
\r
1425 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
\r
1426 png_ptr->zlib_window_bits = window_bits;
\r
1430 png_set_compression_method(png_structp png_ptr, int method)
\r
1432 png_debug(1, "in png_set_compression_method\n");
\r
1433 if (png_ptr == NULL)
\r
1436 png_warning(png_ptr, "Only compression method 8 is supported by PNG");
\r
1437 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD;
\r
1438 png_ptr->zlib_method = method;
\r
1442 png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
\r
1444 if (png_ptr == NULL)
\r
1446 png_ptr->write_row_fn = write_row_fn;
\r
1449 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
\r
1451 png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
\r
1452 write_user_transform_fn)
\r
1454 png_debug(1, "in png_set_write_user_transform_fn\n");
\r
1455 if (png_ptr == NULL)
\r
1457 png_ptr->transformations |= PNG_USER_TRANSFORM;
\r
1458 png_ptr->write_user_transform_fn = write_user_transform_fn;
\r
1463 #if defined(PNG_INFO_IMAGE_SUPPORTED)
\r
1465 png_write_png(png_structp png_ptr, png_infop info_ptr,
\r
1466 int transforms, voidp params)
\r
1468 if (png_ptr == NULL || info_ptr == NULL)
\r
1470 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
\r
1471 /* invert the alpha channel from opacity to transparency */
\r
1472 if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
\r
1473 png_set_invert_alpha(png_ptr);
\r
1476 /* Write the file header information. */
\r
1477 png_write_info(png_ptr, info_ptr);
\r
1479 /* ------ these transformations don't touch the info structure ------- */
\r
1481 #if defined(PNG_WRITE_INVERT_SUPPORTED)
\r
1482 /* invert monochrome pixels */
\r
1483 if (transforms & PNG_TRANSFORM_INVERT_MONO)
\r
1484 png_set_invert_mono(png_ptr);
\r
1487 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
\r
1488 /* Shift the pixels up to a legal bit depth and fill in
\r
1489 * as appropriate to correctly scale the image.
\r
1491 if ((transforms & PNG_TRANSFORM_SHIFT)
\r
1492 && (info_ptr->valid & PNG_INFO_sBIT))
\r
1493 png_set_shift(png_ptr, &info_ptr->sig_bit);
\r
1496 #if defined(PNG_WRITE_PACK_SUPPORTED)
\r
1497 /* pack pixels into bytes */
\r
1498 if (transforms & PNG_TRANSFORM_PACKING)
\r
1499 png_set_packing(png_ptr);
\r
1502 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
\r
1503 /* swap location of alpha bytes from ARGB to RGBA */
\r
1504 if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
\r
1505 png_set_swap_alpha(png_ptr);
\r
1508 #if defined(PNG_WRITE_FILLER_SUPPORTED)
\r
1509 /* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into
\r
1510 * RGB (4 channels -> 3 channels). The second parameter is not used.
\r
1512 if (transforms & PNG_TRANSFORM_STRIP_FILLER)
\r
1513 png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
\r
1516 #if defined(PNG_WRITE_BGR_SUPPORTED)
\r
1517 /* flip BGR pixels to RGB */
\r
1518 if (transforms & PNG_TRANSFORM_BGR)
\r
1519 png_set_bgr(png_ptr);
\r
1522 #if defined(PNG_WRITE_SWAP_SUPPORTED)
\r
1523 /* swap bytes of 16-bit files to most significant byte first */
\r
1524 if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
\r
1525 png_set_swap(png_ptr);
\r
1528 #if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
\r
1529 /* swap bits of 1, 2, 4 bit packed pixel formats */
\r
1530 if (transforms & PNG_TRANSFORM_PACKSWAP)
\r
1531 png_set_packswap(png_ptr);
\r
1534 /* ----------------------- end of transformations ------------------- */
\r
1536 /* write the bits */
\r
1537 if (info_ptr->valid & PNG_INFO_IDAT)
\r
1538 png_write_image(png_ptr, info_ptr->row_pointers);
\r
1540 /* It is REQUIRED to call this to finish writing the rest of the file */
\r
1541 png_write_end(png_ptr, info_ptr);
\r
1543 transforms = transforms; /* quiet compiler warnings */
\r
1547 #endif /* PNG_WRITE_SUPPORTED */
\r