/* pngwrite.c - general routines to write a PNG file * * Last changed in libpng 1.5.0 [October 8, 2010] * Copyright (c) 1998-2010 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * * This code is released under the libpng license. * For conditions of distribution and use, see the disclaimer * and license in png.h */ #include "pngpriv.h" #ifdef PNG_WRITE_SUPPORTED /* Writes all the PNG information. This is the suggested way to use the * library. If you have a new chunk to add, make a function to write it, * and put it in the correct location here. If you want the chunk written * after the image data, put it in png_write_end(). I strongly encourage * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing * the chunk, as that will keep the code from breaking if you want to just * write a plain PNG file. If you have long comments, I suggest writing * them in png_write_end(), and compressing them. */ void PNGAPI png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr) { png_debug(1, "in png_write_info_before_PLTE"); if (png_ptr == NULL || info_ptr == NULL) return; if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE)) { /* Write PNG signature */ png_write_sig(png_ptr); #ifdef PNG_MNG_FEATURES_SUPPORTED if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) && \ (png_ptr->mng_features_permitted)) { png_warning(png_ptr, "MNG features are not allowed in a PNG datastream"); png_ptr->mng_features_permitted = 0; } #endif /* Write IHDR information. */ png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height, info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type, info_ptr->filter_type, #ifdef PNG_WRITE_INTERLACING_SUPPORTED info_ptr->interlace_type); #else 0); #endif /* The rest of these check to see if the valid field has the appropriate * flag set, and if it does, writes the chunk. */ #ifdef PNG_WRITE_gAMA_SUPPORTED if (info_ptr->valid & PNG_INFO_gAMA) png_write_gAMA_fixed(png_ptr, info_ptr->gamma); #endif #ifdef PNG_WRITE_sRGB_SUPPORTED if (info_ptr->valid & PNG_INFO_sRGB) png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent); #endif #ifdef PNG_WRITE_iCCP_SUPPORTED if (info_ptr->valid & PNG_INFO_iCCP) png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE, (png_charp)info_ptr->iccp_profile, (int)info_ptr->iccp_proflen); #endif #ifdef PNG_WRITE_sBIT_SUPPORTED if (info_ptr->valid & PNG_INFO_sBIT) png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type); #endif #ifdef PNG_WRITE_cHRM_SUPPORTED if (info_ptr->valid & PNG_INFO_cHRM) png_write_cHRM_fixed(png_ptr, info_ptr->x_white, info_ptr->y_white, info_ptr->x_red, info_ptr->y_red, info_ptr->x_green, info_ptr->y_green, info_ptr->x_blue, info_ptr->y_blue); #endif #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED if (info_ptr->unknown_chunks_num) { png_unknown_chunk *up; png_debug(5, "writing extra chunks"); for (up = info_ptr->unknown_chunks; up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; up++) { int keep = png_handle_as_unknown(png_ptr, up->name); if (keep != PNG_HANDLE_CHUNK_NEVER && up->location && !(up->location & PNG_HAVE_PLTE) && !(up->location & PNG_HAVE_IDAT) && ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS || (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS))) { if (up->size == 0) png_warning(png_ptr, "Writing zero-length unknown chunk"); png_write_chunk(png_ptr, up->name, up->data, up->size); } } } #endif png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE; } } void PNGAPI png_write_info(png_structp png_ptr, png_infop info_ptr) { #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) int i; #endif png_debug(1, "in png_write_info"); if (png_ptr == NULL || info_ptr == NULL) return; png_write_info_before_PLTE(png_ptr, info_ptr); if (info_ptr->valid & PNG_INFO_PLTE) png_write_PLTE(png_ptr, info_ptr->palette, (png_uint_32)info_ptr->num_palette); else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) png_error(png_ptr, "Valid palette required for paletted images"); #ifdef PNG_WRITE_tRNS_SUPPORTED if (info_ptr->valid & PNG_INFO_tRNS) { #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED /* Invert the alpha channel (in tRNS) */ if ((png_ptr->transformations & PNG_INVERT_ALPHA) && info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) { int j; for (j = 0; j<(int)info_ptr->num_trans; j++) info_ptr->trans_alpha[j] = (png_byte)(255 - info_ptr->trans_alpha[j]); } #endif png_write_tRNS(png_ptr, info_ptr->trans_alpha, &(info_ptr->trans_color), info_ptr->num_trans, info_ptr->color_type); } #endif #ifdef PNG_WRITE_bKGD_SUPPORTED if (info_ptr->valid & PNG_INFO_bKGD) png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type); #endif #ifdef PNG_WRITE_hIST_SUPPORTED if (info_ptr->valid & PNG_INFO_hIST) png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette); #endif #ifdef PNG_WRITE_oFFs_SUPPORTED if (info_ptr->valid & PNG_INFO_oFFs) png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset, info_ptr->offset_unit_type); #endif #ifdef PNG_WRITE_pCAL_SUPPORTED if (info_ptr->valid & PNG_INFO_pCAL) png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0, info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams, info_ptr->pcal_units, info_ptr->pcal_params); #endif #ifdef PNG_WRITE_sCAL_SUPPORTED if (info_ptr->valid & PNG_INFO_sCAL) png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit, info_ptr->scal_s_width, info_ptr->scal_s_height); #endif /* sCAL */ #ifdef PNG_WRITE_pHYs_SUPPORTED if (info_ptr->valid & PNG_INFO_pHYs) png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit, info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type); #endif /* pHYs */ #ifdef PNG_WRITE_tIME_SUPPORTED if (info_ptr->valid & PNG_INFO_tIME) { png_write_tIME(png_ptr, &(info_ptr->mod_time)); png_ptr->mode |= PNG_WROTE_tIME; } #endif /* tIME */ #ifdef PNG_WRITE_sPLT_SUPPORTED if (info_ptr->valid & PNG_INFO_sPLT) for (i = 0; i < (int)info_ptr->splt_palettes_num; i++) png_write_sPLT(png_ptr, info_ptr->splt_palettes + i); #endif /* sPLT */ #ifdef PNG_WRITE_TEXT_SUPPORTED /* Check to see if we need to write text chunks */ for (i = 0; i < info_ptr->num_text; i++) { png_debug2(2, "Writing header text chunk %d, type %d", i, info_ptr->text[i].compression); /* An internationalized chunk? */ if (info_ptr->text[i].compression > 0) { #ifdef PNG_WRITE_iTXt_SUPPORTED /* Write international chunk */ png_write_iTXt(png_ptr, info_ptr->text[i].compression, info_ptr->text[i].key, info_ptr->text[i].lang, info_ptr->text[i].lang_key, info_ptr->text[i].text); #else png_warning(png_ptr, "Unable to write international text"); #endif /* Mark this chunk as written */ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; } /* If we want a compressed text chunk */ else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt) { #ifdef PNG_WRITE_zTXt_SUPPORTED /* Write compressed chunk */ png_write_zTXt(png_ptr, info_ptr->text[i].key, info_ptr->text[i].text, 0, info_ptr->text[i].compression); #else png_warning(png_ptr, "Unable to write compressed text"); #endif /* Mark this chunk as written */ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR; } else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE) { #ifdef PNG_WRITE_tEXt_SUPPORTED /* Write uncompressed chunk */ png_write_tEXt(png_ptr, info_ptr->text[i].key, info_ptr->text[i].text, 0); /* Mark this chunk as written */ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; #else /* Can't get here */ png_warning(png_ptr, "Unable to write uncompressed text"); #endif } } #endif /* tEXt */ #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED if (info_ptr->unknown_chunks_num) { png_unknown_chunk *up; png_debug(5, "writing extra chunks"); for (up = info_ptr->unknown_chunks; up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; up++) { int keep = png_handle_as_unknown(png_ptr, up->name); if (keep != PNG_HANDLE_CHUNK_NEVER && up->location && (up->location & PNG_HAVE_PLTE) && !(up->location & PNG_HAVE_IDAT) && ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS || (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS))) { png_write_chunk(png_ptr, up->name, up->data, up->size); } } } #endif } /* Writes the end of the PNG file. If you don't want to write comments or * time information, you can pass NULL for info. If you already wrote these * in png_write_info(), do not write them again here. If you have long * comments, I suggest writing them here, and compressing them. */ void PNGAPI png_write_end(png_structp png_ptr, png_infop info_ptr) { png_debug(1, "in png_write_end"); if (png_ptr == NULL) return; if (!(png_ptr->mode & PNG_HAVE_IDAT)) png_error(png_ptr, "No IDATs written into file"); /* See if user wants us to write information chunks */ if (info_ptr != NULL) { #ifdef PNG_WRITE_TEXT_SUPPORTED int i; /* local index variable */ #endif #ifdef PNG_WRITE_tIME_SUPPORTED /* Check to see if user has supplied a time chunk */ if ((info_ptr->valid & PNG_INFO_tIME) && !(png_ptr->mode & PNG_WROTE_tIME)) png_write_tIME(png_ptr, &(info_ptr->mod_time)); #endif #ifdef PNG_WRITE_TEXT_SUPPORTED /* Loop through comment chunks */ for (i = 0; i < info_ptr->num_text; i++) { png_debug2(2, "Writing trailer text chunk %d, type %d", i, info_ptr->text[i].compression); /* An internationalized chunk? */ if (info_ptr->text[i].compression > 0) { #ifdef PNG_WRITE_iTXt_SUPPORTED /* Write international chunk */ png_write_iTXt(png_ptr, info_ptr->text[i].compression, info_ptr->text[i].key, info_ptr->text[i].lang, info_ptr->text[i].lang_key, info_ptr->text[i].text); #else png_warning(png_ptr, "Unable to write international text"); #endif /* Mark this chunk as written */ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; } else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt) { #ifdef PNG_WRITE_zTXt_SUPPORTED /* Write compressed chunk */ png_write_zTXt(png_ptr, info_ptr->text[i].key, info_ptr->text[i].text, 0, info_ptr->text[i].compression); #else png_warning(png_ptr, "Unable to write compressed text"); #endif /* Mark this chunk as written */ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR; } else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE) { #ifdef PNG_WRITE_tEXt_SUPPORTED /* Write uncompressed chunk */ png_write_tEXt(png_ptr, info_ptr->text[i].key, info_ptr->text[i].text, 0); #else png_warning(png_ptr, "Unable to write uncompressed text"); #endif /* Mark this chunk as written */ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; } } #endif #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED if (info_ptr->unknown_chunks_num) { png_unknown_chunk *up; png_debug(5, "writing extra chunks"); for (up = info_ptr->unknown_chunks; up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; up++) { int keep = png_handle_as_unknown(png_ptr, up->name); if (keep != PNG_HANDLE_CHUNK_NEVER && up->location && (up->location & PNG_AFTER_IDAT) && ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS || (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS))) { png_write_chunk(png_ptr, up->name, up->data, up->size); } } } #endif } png_ptr->mode |= PNG_AFTER_IDAT; /* Write end of PNG file */ png_write_IEND(png_ptr); /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03, * and restored again in libpng-1.2.30, may cause some applications that * do not set png_ptr->output_flush_fn to crash. If your application * experiences a problem, please try building libpng with * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to * png-mng-implement at lists.sf.net . */ #ifdef PNG_WRITE_FLUSH_SUPPORTED # ifdef PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED png_flush(png_ptr); # endif #endif } #ifdef PNG_CONVERT_tIME_SUPPORTED /* "tm" structure is not supported on WindowsCE */ void PNGAPI png_convert_from_struct_tm(png_timep ptime, PNG_CONST struct tm FAR * ttime) { png_debug(1, "in png_convert_from_struct_tm"); ptime->year = (png_uint_16)(1900 + ttime->tm_year); ptime->month = (png_byte)(ttime->tm_mon + 1); ptime->day = (png_byte)ttime->tm_mday; ptime->hour = (png_byte)ttime->tm_hour; ptime->minute = (png_byte)ttime->tm_min; ptime->second = (png_byte)ttime->tm_sec; } void PNGAPI png_convert_from_time_t(png_timep ptime, time_t ttime) { struct tm *tbuf; png_debug(1, "in png_convert_from_time_t"); tbuf = gmtime(&ttime); png_convert_from_struct_tm(ptime, tbuf); } #endif /* Initialize png_ptr structure, and allocate any memory needed */ PNG_FUNCTION(png_structp,PNGAPI png_create_write_struct,(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn),PNG_ALLOCATED) { #ifdef PNG_USER_MEM_SUPPORTED return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn, warn_fn, NULL, NULL, NULL)); } /* Alternate initialize png_ptr structure, and allocate any memory needed */ static void png_reset_filter_heuristics(png_structp png_ptr); /* forward decl */ PNG_FUNCTION(png_structp,PNGAPI png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED) { #endif /* PNG_USER_MEM_SUPPORTED */ volatile int png_cleanup_needed = 0; #ifdef PNG_SETJMP_SUPPORTED volatile #endif png_structp png_ptr; #ifdef PNG_SETJMP_SUPPORTED #ifdef USE_FAR_KEYWORD jmp_buf png_jmpbuf; #endif #endif int i; png_debug(1, "in png_create_write_struct"); #ifdef PNG_USER_MEM_SUPPORTED png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr); #else png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); #endif /* PNG_USER_MEM_SUPPORTED */ if (png_ptr == NULL) return (NULL); /* Added at libpng-1.2.6 */ #ifdef PNG_SET_USER_LIMITS_SUPPORTED png_ptr->user_width_max = PNG_USER_WIDTH_MAX; png_ptr->user_height_max = PNG_USER_HEIGHT_MAX; #endif #ifdef PNG_SETJMP_SUPPORTED /* Applications that neglect to set up their own setjmp() and then encounter a png_error() will longjmp here. Since the jmpbuf is then meaningless we abort instead of returning. */ #ifdef USE_FAR_KEYWORD if (setjmp(png_jmpbuf)) #else if (setjmp(png_jmpbuf(png_ptr))) /* sets longjmp to match setjmp */ #endif #ifdef USE_FAR_KEYWORD png_memcpy(png_jmpbuf(png_ptr), png_jmpbuf, png_sizeof(jmp_buf)); #endif PNG_ABORT(); #endif #ifdef PNG_USER_MEM_SUPPORTED png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn); #endif /* PNG_USER_MEM_SUPPORTED */ png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); if (user_png_ver) { i = 0; do { if (user_png_ver[i] != png_libpng_ver[i]) png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; } while (png_libpng_ver[i++]); } if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) { /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so * we must recompile any applications that use any older library version. * For versions after libpng 1.0, we will be compatible, so we need * only check the first digit. */ if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) || (user_png_ver[0] == '0' && user_png_ver[2] < '9')) { #ifdef PNG_CONSOLE_IO_SUPPORTED char msg[80]; if (user_png_ver) { png_snprintf2(msg, 80, "Application built with libpng-%.20s" " but running with %.20s", user_png_ver, png_libpng_ver); png_warning(png_ptr, msg); } #else png_warning(png_ptr, "Incompatible libpng version in application and library"); #endif #ifdef PNG_ERROR_NUMBERS_SUPPORTED png_ptr->flags = 0; #endif png_cleanup_needed = 1; } } /* Initialize zbuf - compression buffer */ png_ptr->zbuf_size = PNG_ZBUF_SIZE; if (!png_cleanup_needed) { png_ptr->zbuf = (png_bytep)png_malloc_warn(png_ptr, png_ptr->zbuf_size); if (png_ptr->zbuf == NULL) png_cleanup_needed = 1; } if (png_cleanup_needed) { /* Clean up PNG structure and deallocate any memory. */ png_free(png_ptr, png_ptr->zbuf); png_ptr->zbuf = NULL; #ifdef PNG_USER_MEM_SUPPORTED png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn, (png_voidp)mem_ptr); #else png_destroy_struct((png_voidp)png_ptr); #endif return (NULL); } png_set_write_fn(png_ptr, NULL, NULL, NULL); #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED png_reset_filter_heuristics(png_ptr); #endif return (png_ptr); } /* Write a few rows of image data. If the image is interlaced, * either you will have to write the 7 sub images, or, if you * have called png_set_interlace_handling(), you will have to * "write" the image seven times. */ void PNGAPI png_write_rows(png_structp png_ptr, png_bytepp row, png_uint_32 num_rows) { png_uint_32 i; /* row counter */ png_bytepp rp; /* row pointer */ png_debug(1, "in png_write_rows"); if (png_ptr == NULL) return; /* Loop through the rows */ for (i = 0, rp = row; i < num_rows; i++, rp++) { png_write_row(png_ptr, *rp); } } /* Write the image. You only need to call this function once, even * if you are writing an interlaced image. */ void PNGAPI png_write_image(png_structp png_ptr, png_bytepp image) { png_uint_32 i; /* row index */ int pass, num_pass; /* pass variables */ png_bytepp rp; /* points to current row */ if (png_ptr == NULL) return; png_debug(1, "in png_write_image"); #ifdef PNG_WRITE_INTERLACING_SUPPORTED /* Initialize interlace handling. If image is not interlaced, * this will set pass to 1 */ num_pass = png_set_interlace_handling(png_ptr); #else num_pass = 1; #endif /* Loop through passes */ for (pass = 0; pass < num_pass; pass++) { /* Loop through image */ for (i = 0, rp = image; i < png_ptr->height; i++, rp++) { png_write_row(png_ptr, *rp); } } } /* Called by user to write a row of image data */ void PNGAPI png_write_row(png_structp png_ptr, png_const_bytep row) { if (png_ptr == NULL) return; png_debug2(1, "in png_write_row (row %u, pass %d)", png_ptr->row_number, png_ptr->pass); /* Initialize transformations and other stuff if first time */ if (png_ptr->row_number == 0 && png_ptr->pass == 0) { /* Make sure we wrote the header info */ if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE)) png_error(png_ptr, "png_write_info was never called before png_write_row"); /* Check for transforms that have been set but were defined out */ #if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED) if (png_ptr->transformations & PNG_INVERT_MONO) png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined"); #endif #if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED) if (png_ptr->transformations & PNG_FILLER) png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined"); #endif #if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \ defined(PNG_READ_PACKSWAP_SUPPORTED) if (png_ptr->transformations & PNG_PACKSWAP) png_warning(png_ptr, "PNG_WRITE_PACKSWAP_SUPPORTED is not defined"); #endif #if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED) if (png_ptr->transformations & PNG_PACK) png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined"); #endif #if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED) if (png_ptr->transformations & PNG_SHIFT) png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined"); #endif #if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED) if (png_ptr->transformations & PNG_BGR) png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined"); #endif #if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED) if (png_ptr->transformations & PNG_SWAP_BYTES) png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined"); #endif png_write_start_row(png_ptr); } #ifdef PNG_WRITE_INTERLACING_SUPPORTED /* If interlaced and not interested in row, return */ if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) { switch (png_ptr->pass) { case 0: if (png_ptr->row_number & 0x07) { png_write_finish_row(png_ptr); return; } break; case 1: if ((png_ptr->row_number & 0x07) || png_ptr->width < 5) { png_write_finish_row(png_ptr); return; } break; case 2: if ((png_ptr->row_number & 0x07) != 4) { png_write_finish_row(png_ptr); return; } break; case 3: if ((png_ptr->row_number & 0x03) || png_ptr->width < 3) { png_write_finish_row(png_ptr); return; } break; case 4: if ((png_ptr->row_number & 0x03) != 2) { png_write_finish_row(png_ptr); return; } break; case 5: if ((png_ptr->row_number & 0x01) || png_ptr->width < 2) { png_write_finish_row(png_ptr); return; } break; case 6: if (!(png_ptr->row_number & 0x01)) { png_write_finish_row(png_ptr); return; } break; default: /* error: ignore it */ break; } } #endif /* Set up row info for transformations */ png_ptr->row_info.color_type = png_ptr->color_type; png_ptr->row_info.width = png_ptr->usr_width; png_ptr->row_info.channels = png_ptr->usr_channels; png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth; png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth * png_ptr->row_info.channels); png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, png_ptr->row_info.width); png_debug1(3, "row_info->color_type = %d", png_ptr->row_info.color_type); png_debug1(3, "row_info->width = %u", png_ptr->row_info.width); png_debug1(3, "row_info->channels = %d", png_ptr->row_info.channels); png_debug1(3, "row_info->bit_depth = %d", png_ptr->row_info.bit_depth); png_debug1(3, "row_info->pixel_depth = %d", png_ptr->row_info.pixel_depth); png_debug1(3, "row_info->rowbytes = %u", png_ptr->row_info.rowbytes); /* Copy user's row into buffer, leaving room for filter byte. */ png_memcpy(png_ptr->row_buf + 1, row, png_ptr->row_info.rowbytes); #ifdef PNG_WRITE_INTERLACING_SUPPORTED /* Handle interlacing */ if (png_ptr->interlaced && png_ptr->pass < 6 && (png_ptr->transformations & PNG_INTERLACE)) { png_do_write_interlace(&(png_ptr->row_info), png_ptr->row_buf + 1, png_ptr->pass); /* This should always get caught above, but still ... */ if (!(png_ptr->row_info.width)) { png_write_finish_row(png_ptr); return; } } #endif /* Handle other transformations */ if (png_ptr->transformations) png_do_write_transformations(png_ptr); #ifdef PNG_MNG_FEATURES_SUPPORTED /* Write filter_method 64 (intrapixel differencing) only if * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and * 2. Libpng did not write a PNG signature (this filter_method is only * used in PNG datastreams that are embedded in MNG datastreams) and * 3. The application called png_permit_mng_features with a mask that * included PNG_FLAG_MNG_FILTER_64 and * 4. The filter_method is 64 and * 5. The color_type is RGB or RGBA */ if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) { /* Intrapixel differencing */ png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1); } #endif /* Find a filter if necessary, filter the row and write it out. */ png_write_find_filter(png_ptr, &(png_ptr->row_info)); if (png_ptr->write_row_fn != NULL) (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass); } #ifdef PNG_WRITE_FLUSH_SUPPORTED /* Set the automatic flush interval or 0 to turn flushing off */ void PNGAPI png_set_flush(png_structp png_ptr, int nrows) { png_debug(1, "in png_set_flush"); if (png_ptr == NULL) return; png_ptr->flush_dist = (nrows < 0 ? 0 : nrows); } /* Flush the current output buffers now */ void PNGAPI png_write_flush(png_structp png_ptr) { int wrote_IDAT; png_debug(1, "in png_write_flush"); if (png_ptr == NULL) return; /* We have already written out all of the data */ if (png_ptr->row_number >= png_ptr->num_rows) return; do { int ret; /* Compress the data */ ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH); wrote_IDAT = 0; /* Check for compression errors */ if (ret != Z_OK) { if (png_ptr->zstream.msg != NULL) png_error(png_ptr, png_ptr->zstream.msg); else png_error(png_ptr, "zlib error"); } if (!(png_ptr->zstream.avail_out)) { /* Write the IDAT and reset the zlib output buffer */ png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); png_ptr->zstream.next_out = png_ptr->zbuf; png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; wrote_IDAT = 1; } } while (wrote_IDAT == 1); /* If there is any data left to be output, write it into a new IDAT */ if (png_ptr->zbuf_size != png_ptr->zstream.avail_out) { /* Write the IDAT and reset the zlib output buffer */ png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size - png_ptr->zstream.avail_out); png_ptr->zstream.next_out = png_ptr->zbuf; png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; } png_ptr->flush_rows = 0; png_flush(png_ptr); } #endif /* PNG_WRITE_FLUSH_SUPPORTED */ /* Free all memory used by the write */ void PNGAPI png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr) { png_structp png_ptr = NULL; png_infop info_ptr = NULL; #ifdef PNG_USER_MEM_SUPPORTED png_free_ptr free_fn = NULL; png_voidp mem_ptr = NULL; #endif png_debug(1, "in png_destroy_write_struct"); if (png_ptr_ptr != NULL) { png_ptr = *png_ptr_ptr; #ifdef PNG_USER_MEM_SUPPORTED free_fn = png_ptr->free_fn; mem_ptr = png_ptr->mem_ptr; #endif } #ifdef PNG_USER_MEM_SUPPORTED if (png_ptr != NULL) { free_fn = png_ptr->free_fn; mem_ptr = png_ptr->mem_ptr; } #endif if (info_ptr_ptr != NULL) info_ptr = *info_ptr_ptr; if (info_ptr != NULL) { if (png_ptr != NULL) { png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED if (png_ptr->num_chunk_list) { png_free(png_ptr, png_ptr->chunk_list); png_ptr->num_chunk_list = 0; } #endif } #ifdef PNG_USER_MEM_SUPPORTED png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn, (png_voidp)mem_ptr); #else png_destroy_struct((png_voidp)info_ptr); #endif *info_ptr_ptr = NULL; } if (png_ptr != NULL) { png_write_destroy(png_ptr); #ifdef PNG_USER_MEM_SUPPORTED png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn, (png_voidp)mem_ptr); #else png_destroy_struct((png_voidp)png_ptr); #endif *png_ptr_ptr = NULL; } } /* Free any memory used in png_ptr struct (old method) */ void /* PRIVATE */ png_write_destroy(png_structp png_ptr) { #ifdef PNG_SETJMP_SUPPORTED jmp_buf tmp_jmp; /* Save jump buffer */ #endif png_error_ptr error_fn; png_error_ptr warning_fn; png_voidp error_ptr; #ifdef PNG_USER_MEM_SUPPORTED png_free_ptr free_fn; #endif png_debug(1, "in png_write_destroy"); /* Free any memory zlib uses */ deflateEnd(&png_ptr->zstream); /* Free our memory. png_free checks NULL for us. */ png_free(png_ptr, png_ptr->zbuf); png_free(png_ptr, png_ptr->row_buf); #ifdef PNG_WRITE_FILTER_SUPPORTED png_free(png_ptr, png_ptr->prev_row); png_free(png_ptr, png_ptr->sub_row); png_free(png_ptr, png_ptr->up_row); png_free(png_ptr, png_ptr->avg_row); png_free(png_ptr, png_ptr->paeth_row); #endif #ifdef PNG_TIME_RFC1123_SUPPORTED png_free(png_ptr, png_ptr->time_buffer); #endif #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* Use this to save a little code space, it doesn't free the filter_costs */ png_reset_filter_heuristics(png_ptr); png_free(png_ptr, png_ptr->filter_costs); png_free(png_ptr, png_ptr->inv_filter_costs); #endif #ifdef PNG_SETJMP_SUPPORTED /* Reset structure */ png_memcpy(tmp_jmp, png_ptr->png_jmpbuf, png_sizeof(jmp_buf)); #endif error_fn = png_ptr->error_fn; warning_fn = png_ptr->warning_fn; error_ptr = png_ptr->error_ptr; #ifdef PNG_USER_MEM_SUPPORTED free_fn = png_ptr->free_fn; #endif png_memset(png_ptr, 0, png_sizeof(png_struct)); png_ptr->error_fn = error_fn; png_ptr->warning_fn = warning_fn; png_ptr->error_ptr = error_ptr; #ifdef PNG_USER_MEM_SUPPORTED png_ptr->free_fn = free_fn; #endif #ifdef PNG_SETJMP_SUPPORTED png_memcpy(png_ptr->png_jmpbuf, tmp_jmp, png_sizeof(jmp_buf)); #endif } /* Allow the application to select one or more row filters to use. */ void PNGAPI png_set_filter(png_structp png_ptr, int method, int filters) { png_debug(1, "in png_set_filter"); if (png_ptr == NULL) return; #ifdef PNG_MNG_FEATURES_SUPPORTED if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && (method == PNG_INTRAPIXEL_DIFFERENCING)) method = PNG_FILTER_TYPE_BASE; #endif if (method == PNG_FILTER_TYPE_BASE) { switch (filters & (PNG_ALL_FILTERS | 0x07)) { #ifdef PNG_WRITE_FILTER_SUPPORTED case 5: case 6: case 7: png_warning(png_ptr, "Unknown row filter for method 0"); #endif /* PNG_WRITE_FILTER_SUPPORTED */ case PNG_FILTER_VALUE_NONE: png_ptr->do_filter = PNG_FILTER_NONE; break; #ifdef PNG_WRITE_FILTER_SUPPORTED case PNG_FILTER_VALUE_SUB: png_ptr->do_filter = PNG_FILTER_SUB; break; case PNG_FILTER_VALUE_UP: png_ptr->do_filter = PNG_FILTER_UP; break; case PNG_FILTER_VALUE_AVG: png_ptr->do_filter = PNG_FILTER_AVG; break; case PNG_FILTER_VALUE_PAETH: png_ptr->do_filter = PNG_FILTER_PAETH; break; default: png_ptr->do_filter = (png_byte)filters; break; #else default: png_warning(png_ptr, "Unknown row filter for method 0"); #endif /* PNG_WRITE_FILTER_SUPPORTED */ } /* If we have allocated the row_buf, this means we have already started * with the image and we should have allocated all of the filter buffers * that have been selected. If prev_row isn't already allocated, then * it is too late to start using the filters that need it, since we * will be missing the data in the previous row. If an application * wants to start and stop using particular filters during compression, * it should start out with all of the filters, and then add and * remove them after the start of compression. */ if (png_ptr->row_buf != NULL) { #ifdef PNG_WRITE_FILTER_SUPPORTED if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL) { png_ptr->sub_row = (png_bytep)png_malloc(png_ptr, (png_ptr->rowbytes + 1)); png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB; } if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL) { if (png_ptr->prev_row == NULL) { png_warning(png_ptr, "Can't add Up filter after starting"); png_ptr->do_filter = (png_byte)(png_ptr->do_filter & ~PNG_FILTER_UP); } else { png_ptr->up_row = (png_bytep)png_malloc(png_ptr, (png_ptr->rowbytes + 1)); png_ptr->up_row[0] = PNG_FILTER_VALUE_UP; } } if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL) { if (png_ptr->prev_row == NULL) { png_warning(png_ptr, "Can't add Average filter after starting"); png_ptr->do_filter = (png_byte)(png_ptr->do_filter & ~PNG_FILTER_AVG); } else { png_ptr->avg_row = (png_bytep)png_malloc(png_ptr, (png_ptr->rowbytes + 1)); png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG; } } if ((png_ptr->do_filter & PNG_FILTER_PAETH) && png_ptr->paeth_row == NULL) { if (png_ptr->prev_row == NULL) { png_warning(png_ptr, "Can't add Paeth filter after starting"); png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH); } else { png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr, (png_ptr->rowbytes + 1)); png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH; } } if (png_ptr->do_filter == PNG_NO_FILTERS) #endif /* PNG_WRITE_FILTER_SUPPORTED */ png_ptr->do_filter = PNG_FILTER_NONE; } } else png_error(png_ptr, "Unknown custom filter method"); } /* This allows us to influence the way in which libpng chooses the "best" * filter for the current scanline. While the "minimum-sum-of-absolute- * differences metric is relatively fast and effective, there is some * question as to whether it can be improved upon by trying to keep the * filtered data going to zlib more consistent, hopefully resulting in * better compression. */ #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* GRR 970116 */ /* Conveneince reset API. */ static void png_reset_filter_heuristics(png_structp png_ptr) { /* Clear out any old values in the 'weights' - this must be done because if * the app calls set_filter_heuristics multiple times with different * 'num_weights' values we would otherwise potentially have wrong sized * arrays. */ png_ptr->num_prev_filters = 0; png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED; if (png_ptr->prev_filters != NULL) { png_bytep old = png_ptr->prev_filters; png_ptr->prev_filters = NULL; png_free(png_ptr, old); } if (png_ptr->filter_weights != NULL) { png_uint_16p old = png_ptr->filter_weights; png_ptr->filter_weights = NULL; png_free(png_ptr, old); } if (png_ptr->inv_filter_weights != NULL) { png_uint_16p old = png_ptr->inv_filter_weights; png_ptr->inv_filter_weights = NULL; png_free(png_ptr, old); } /* Leave the filter_costs - this array is fixed size. */ } static int png_init_filter_heuristics(png_structp png_ptr, int heuristic_method, int num_weights) { if (png_ptr == NULL) return 0; /* Clear out the arrays */ png_reset_filter_heuristics(png_ptr); /* Check arguments; the 'reset' function makes the correct settings for the * unweighted case, but we must handle the weight case by initializing the * arrays for the caller. */ if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) { int i; if (num_weights > 0) { png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr, (png_uint_32)(png_sizeof(png_byte) * num_weights)); /* To make sure that the weighting starts out fairly */ for (i = 0; i < num_weights; i++) { png_ptr->prev_filters[i] = 255; } png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr, (png_uint_32)(png_sizeof(png_uint_16) * num_weights)); png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr, (png_uint_32)(png_sizeof(png_uint_16) * num_weights)); for (i = 0; i < num_weights; i++) { png_ptr->inv_filter_weights[i] = png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR; } /* Safe to set this now */ png_ptr->num_prev_filters = (png_byte)num_weights; } /* If, in the future, there are other filter methods, this would * need to be based on png_ptr->filter. */ if (png_ptr->filter_costs == NULL) { png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr, (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST)); png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr, (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST)); } for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) { png_ptr->inv_filter_costs[i] = png_ptr->filter_costs[i] = PNG_COST_FACTOR; } /* All the arrays are inited, safe to set this: */ png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_WEIGHTED; /* Return the 'ok' code. */ return 1; } else if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT || heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED) { return 1; } else { png_warning(png_ptr, "Unknown filter heuristic method"); return 0; } } /* Provide floating and fixed point APIs */ #ifdef PNG_FLOATING_POINT_SUPPORTED void PNGAPI png_set_filter_heuristics(png_structp png_ptr, int heuristic_method, int num_weights, png_const_doublep filter_weights, png_const_doublep filter_costs) { png_debug(1, "in png_set_filter_heuristics"); /* The internal API allocates all the arrays and ensures that the elements of * those arrays are set to the default value. */ if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights)) return; /* If using the weighted method copy in the weights. */ if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) { int i; for (i = 0; i < num_weights; i++) { if (filter_weights[i] <= 0.0) { png_ptr->inv_filter_weights[i] = png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR; } else { png_ptr->inv_filter_weights[i] = (png_uint_16)(PNG_WEIGHT_FACTOR*filter_weights[i]+.5); png_ptr->filter_weights[i] = (png_uint_16)(PNG_WEIGHT_FACTOR/filter_weights[i]+.5); } } /* Here is where we set the relative costs of the different filters. We * should take the desired compression level into account when setting * the costs, so that Paeth, for instance, has a high relative cost at low * compression levels, while it has a lower relative cost at higher * compression settings. The filter types are in order of increasing * relative cost, so it would be possible to do this with an algorithm. */ for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) if (filter_costs[i] >= 1.0) { png_ptr->inv_filter_costs[i] = (png_uint_16)(PNG_COST_FACTOR / filter_costs[i] + .5); png_ptr->filter_costs[i] = (png_uint_16)(PNG_COST_FACTOR * filter_costs[i] + .5); } } } #endif /* FLOATING_POINT */ #ifdef PNG_FIXED_POINT_SUPPORTED void PNGAPI png_set_filter_heuristics_fixed(png_structp png_ptr, int heuristic_method, int num_weights, png_const_fixed_point_p filter_weights, png_const_fixed_point_p filter_costs) { png_debug(1, "in png_set_filter_heuristics_fixed"); /* The internal API allocates all the arrays and ensures that the elements of * those arrays are set to the default value. */ if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights)) return; /* If using the weighted method copy in the weights. */ if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) { int i; for (i = 0; i < num_weights; i++) { if (filter_weights[i] <= 0) { png_ptr->inv_filter_weights[i] = png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR; } else { png_ptr->inv_filter_weights[i] = (png_uint_16) ((PNG_WEIGHT_FACTOR*filter_weights[i]+PNG_FP_HALF)/PNG_FP_1); png_ptr->filter_weights[i] = (png_uint_16)((PNG_WEIGHT_FACTOR* PNG_FP_1+(filter_weights[i]/2))/filter_weights[i]); } } /* Here is where we set the relative costs of the different filters. We * should take the desired compression level into account when setting * the costs, so that Paeth, for instance, has a high relative cost at low * compression levels, while it has a lower relative cost at higher * compression settings. The filter types are in order of increasing * relative cost, so it would be possible to do this with an algorithm. */ for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) if (filter_costs[i] >= PNG_FP_1) { png_uint_32 tmp; /* Use a 32 bit unsigned temporary here because otherwise the * intermediate value will be a 32 bit *signed* integer (ANSI rules) * and this will get the wrong answer on division. */ tmp = PNG_COST_FACTOR*PNG_FP_1 + (filter_costs[i]/2); tmp /= filter_costs[i]; png_ptr->inv_filter_costs[i] = (png_uint_16)tmp; tmp = PNG_COST_FACTOR * filter_costs[i] + PNG_FP_HALF; tmp /= PNG_FP_1; png_ptr->filter_costs[i] = (png_uint_16)tmp; } } } #endif /* FIXED_POINT */ #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ void PNGAPI png_set_compression_level(png_structp png_ptr, int level) { png_debug(1, "in png_set_compression_level"); if (png_ptr == NULL) return; png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL; png_ptr->zlib_level = level; } void PNGAPI png_set_compression_mem_level(png_structp png_ptr, int mem_level) { png_debug(1, "in png_set_compression_mem_level"); if (png_ptr == NULL) return; png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL; png_ptr->zlib_mem_level = mem_level; } void PNGAPI png_set_compression_strategy(png_structp png_ptr, int strategy) { png_debug(1, "in png_set_compression_strategy"); if (png_ptr == NULL) return; png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY; png_ptr->zlib_strategy = strategy; } void PNGAPI png_set_compression_window_bits(png_structp png_ptr, int window_bits) { if (png_ptr == NULL) return; if (window_bits > 15) png_warning(png_ptr, "Only compression windows <= 32k supported by PNG"); else if (window_bits < 8) png_warning(png_ptr, "Only compression windows >= 256 supported by PNG"); #ifndef WBITS_8_OK /* Avoid libpng bug with 256-byte windows */ if (window_bits == 8) { png_warning(png_ptr, "Compression window is being reset to 512"); window_bits = 9; } #endif png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS; png_ptr->zlib_window_bits = window_bits; } void PNGAPI png_set_compression_method(png_structp png_ptr, int method) { png_debug(1, "in png_set_compression_method"); if (png_ptr == NULL) return; if (method != 8) png_warning(png_ptr, "Only compression method 8 is supported by PNG"); png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD; png_ptr->zlib_method = method; } void PNGAPI png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn) { if (png_ptr == NULL) return; png_ptr->write_row_fn = write_row_fn; } #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED void PNGAPI png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr write_user_transform_fn) { png_debug(1, "in png_set_write_user_transform_fn"); if (png_ptr == NULL) return; png_ptr->transformations |= PNG_USER_TRANSFORM; png_ptr->write_user_transform_fn = write_user_transform_fn; } #endif #ifdef PNG_INFO_IMAGE_SUPPORTED void PNGAPI png_write_png(png_structp png_ptr, png_infop info_ptr, int transforms, voidp params) { if (png_ptr == NULL || info_ptr == NULL) return; /* Write the file header information. */ png_write_info(png_ptr, info_ptr); /* ------ these transformations don't touch the info structure ------- */ #ifdef PNG_WRITE_INVERT_SUPPORTED /* Invert monochrome pixels */ if (transforms & PNG_TRANSFORM_INVERT_MONO) png_set_invert_mono(png_ptr); #endif #ifdef PNG_WRITE_SHIFT_SUPPORTED /* Shift the pixels up to a legal bit depth and fill in * as appropriate to correctly scale the image. */ if ((transforms & PNG_TRANSFORM_SHIFT) && (info_ptr->valid & PNG_INFO_sBIT)) png_set_shift(png_ptr, &info_ptr->sig_bit); #endif #ifdef PNG_WRITE_PACK_SUPPORTED /* Pack pixels into bytes */ if (transforms & PNG_TRANSFORM_PACKING) png_set_packing(png_ptr); #endif #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED /* Swap location of alpha bytes from ARGB to RGBA */ if (transforms & PNG_TRANSFORM_SWAP_ALPHA) png_set_swap_alpha(png_ptr); #endif #ifdef PNG_WRITE_FILLER_SUPPORTED /* Pack XRGB/RGBX/ARGB/RGBA into * RGB (4 channels -> 3 channels) */ if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER) png_set_filler(png_ptr, 0, PNG_FILLER_AFTER); else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE) png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE); #endif #ifdef PNG_WRITE_BGR_SUPPORTED /* Flip BGR pixels to RGB */ if (transforms & PNG_TRANSFORM_BGR) png_set_bgr(png_ptr); #endif #ifdef PNG_WRITE_SWAP_SUPPORTED /* Swap bytes of 16-bit files to most significant byte first */ if (transforms & PNG_TRANSFORM_SWAP_ENDIAN) png_set_swap(png_ptr); #endif #ifdef PNG_WRITE_PACKSWAP_SUPPORTED /* Swap bits of 1, 2, 4 bit packed pixel formats */ if (transforms & PNG_TRANSFORM_PACKSWAP) png_set_packswap(png_ptr); #endif #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED /* Invert the alpha channel from opacity to transparency */ if (transforms & PNG_TRANSFORM_INVERT_ALPHA) png_set_invert_alpha(png_ptr); #endif /* ----------------------- end of transformations ------------------- */ /* Write the bits */ if (info_ptr->valid & PNG_INFO_IDAT) png_write_image(png_ptr, info_ptr->row_pointers); /* It is REQUIRED to call this to finish writing the rest of the file */ png_write_end(png_ptr, info_ptr); transforms = transforms; /* Quiet compiler warnings */ params = params; } #endif #endif /* PNG_WRITE_SUPPORTED */