X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/a626cc03053700ca5bdbf0243831bec528e6fc4d..21bd196564d8483879a57c40ec1eea64114f9bd4:/src/png/pngwrite.c diff --git a/src/png/pngwrite.c b/src/png/pngwrite.c index 3b533e58c2..f422173bf2 100644 --- a/src/png/pngwrite.c +++ b/src/png/pngwrite.c @@ -1,16 +1,17 @@ /* pngwrite.c - general routines to write a PNG file * - * libpng 1.0.3 - January 14, 1999 + * libpng 1.2.7 - September 12, 2004 * For conditions of distribution and use, see copyright notice in png.h - * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. - * Copyright (c) 1996, 1997 Andreas Dilger - * Copyright (c) 1998, 1999 Glenn Randers-Pehrson + * Copyright (c) 1998-2004 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.) */ /* get internal access to png.h */ #define PNG_INTERNAL #include "png.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, @@ -21,15 +22,20 @@ * write a plain PNG file. If you have long comments, I suggest writing * them in png_write_end(), and compressing them. */ -void -png_write_info(png_structp png_ptr, png_infop info_ptr) +void PNGAPI +png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr) { -#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) - int i; -#endif - - png_debug(1, "in png_write_info\n"); + png_debug(1, "in png_write_info_before_PLTE\n"); + if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE)) + { png_write_sig(png_ptr); /* write PNG signature */ +#if defined(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\n"); + 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, @@ -43,24 +49,87 @@ png_write_info(png_structp png_ptr, png_infop info_ptr) flag set, and if it does, writes the chunk. */ #if defined(PNG_WRITE_gAMA_SUPPORTED) if (info_ptr->valid & PNG_INFO_gAMA) + { +# ifdef PNG_FLOATING_POINT_SUPPORTED png_write_gAMA(png_ptr, info_ptr->gamma); +#else +#ifdef PNG_FIXED_POINT_SUPPORTED + png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma); +# endif +#endif + } #endif #if defined(PNG_WRITE_sRGB_SUPPORTED) if (info_ptr->valid & PNG_INFO_sRGB) png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent); #endif +#if defined(PNG_WRITE_iCCP_SUPPORTED) + if (info_ptr->valid & PNG_INFO_iCCP) + png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE, + info_ptr->iccp_profile, (int)info_ptr->iccp_proflen); +#endif #if defined(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 #if defined(PNG_WRITE_cHRM_SUPPORTED) if (info_ptr->valid & PNG_INFO_cHRM) + { +#ifdef PNG_FLOATING_POINT_SUPPORTED png_write_cHRM(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); +#else +# ifdef PNG_FIXED_POINT_SUPPORTED + png_write_cHRM_fixed(png_ptr, + info_ptr->int_x_white, info_ptr->int_y_white, + info_ptr->int_x_red, info_ptr->int_y_red, + info_ptr->int_x_green, info_ptr->int_y_green, + info_ptr->int_x_blue, info_ptr->int_y_blue); +# endif +#endif + } +#endif +#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) + if (info_ptr->unknown_chunks_num) + { + png_unknown_chunk *up; + + png_debug(5, "writing extra chunks\n"); + + 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 + 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\n"); + + 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); @@ -72,12 +141,12 @@ png_write_info(png_structp png_ptr, png_infop info_ptr) { #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) /* invert the alpha channel (in tRNS) */ - if (png_ptr->transformations & PNG_INVERT_ALPHA && + 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[j] = 255 - info_ptr->trans[j]; + info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]); } #endif png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values), @@ -103,6 +172,21 @@ png_write_info(png_structp png_ptr, png_infop info_ptr) info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams, info_ptr->pcal_units, info_ptr->pcal_params); #endif +#if defined(PNG_WRITE_sCAL_SUPPORTED) + if (info_ptr->valid & PNG_INFO_sCAL) +#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) + png_write_sCAL(png_ptr, (int)info_ptr->scal_unit, + info_ptr->scal_pixel_width, info_ptr->scal_pixel_height); +#else +#ifdef PNG_FIXED_POINT_SUPPORTED + png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit, + info_ptr->scal_s_width, info_ptr->scal_s_height); +#else + png_warning(png_ptr, + "png_write_sCAL not supported; sCAL chunk not written.\n"); +#endif +#endif +#endif #if defined(PNG_WRITE_pHYs_SUPPORTED) if (info_ptr->valid & PNG_INFO_pHYs) png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit, @@ -112,22 +196,44 @@ png_write_info(png_structp png_ptr, png_infop info_ptr) if (info_ptr->valid & PNG_INFO_tIME) { png_write_tIME(png_ptr, &(info_ptr->mod_time)); - png_ptr->flags |= PNG_FLAG_WROTE_tIME; + png_ptr->mode |= PNG_WROTE_tIME; } #endif -#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) +#if defined(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 +#if defined(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\n", i, info_ptr->text[i].compression); + /* an internationalized chunk? */ + if (info_ptr->text[i].compression > 0) + { +#if defined(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\n"); +#endif + /* Mark this chunk as written */ + info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; + } /* If we want a compressed text chunk */ - if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt) + else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt) { #if defined(PNG_WRITE_zTXt_SUPPORTED) /* write compressed chunk */ png_write_zTXt(png_ptr, info_ptr->text[i].key, - info_ptr->text[i].text, info_ptr->text[i].text_length, + info_ptr->text[i].text, 0, info_ptr->text[i].compression); #else png_warning(png_ptr, "Unable to write compressed text\n"); @@ -140,7 +246,8 @@ png_write_info(png_structp png_ptr, png_infop info_ptr) #if defined(PNG_WRITE_tEXt_SUPPORTED) /* write uncompressed chunk */ png_write_tEXt(png_ptr, info_ptr->text[i].key, - info_ptr->text[i].text, info_ptr->text[i].text_length); + info_ptr->text[i].text, + 0); #else png_warning(png_ptr, "Unable to write uncompressed text\n"); #endif @@ -149,6 +256,29 @@ png_write_info(png_structp png_ptr, png_infop info_ptr) } } #endif +#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) + if (info_ptr->unknown_chunks_num) + { + png_unknown_chunk *up; + + png_debug(5, "writing extra chunks\n"); + + 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 @@ -156,7 +286,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr) * in png_write_info(), do not write them again here. If you have long * comments, I suggest writing them here, and compressing them. */ -void +void PNGAPI png_write_end(png_structp png_ptr, png_infop info_ptr) { png_debug(1, "in png_write_end\n"); @@ -166,27 +296,44 @@ png_write_end(png_structp png_ptr, png_infop info_ptr) /* see if user wants us to write information chunks */ if (info_ptr != NULL) { -#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) +#if defined(PNG_WRITE_TEXT_SUPPORTED) int i; /* local index variable */ #endif #if defined(PNG_WRITE_tIME_SUPPORTED) /* check to see if user has supplied a time chunk */ - if (info_ptr->valid & PNG_INFO_tIME && - !(png_ptr->flags & PNG_FLAG_WROTE_tIME)) + if ((info_ptr->valid & PNG_INFO_tIME) && + !(png_ptr->mode & PNG_WROTE_tIME)) png_write_tIME(png_ptr, &(info_ptr->mod_time)); #endif -#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) +#if defined(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\n", i, info_ptr->text[i].compression); - if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt) + /* an internationalized chunk? */ + if (info_ptr->text[i].compression > 0) + { +#if defined(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\n"); +#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) { #if defined(PNG_WRITE_zTXt_SUPPORTED) /* write compressed chunk */ png_write_zTXt(png_ptr, info_ptr->text[i].key, - info_ptr->text[i].text, info_ptr->text[i].text_length, + info_ptr->text[i].text, 0, info_ptr->text[i].compression); #else png_warning(png_ptr, "Unable to write compressed text\n"); @@ -199,7 +346,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr) #if defined(PNG_WRITE_tEXt_SUPPORTED) /* write uncompressed chunk */ png_write_tEXt(png_ptr, info_ptr->text[i].key, - info_ptr->text[i].text, info_ptr->text[i].text_length); + info_ptr->text[i].text, 0); #else png_warning(png_ptr, "Unable to write uncompressed text\n"); #endif @@ -208,6 +355,28 @@ png_write_end(png_structp png_ptr, png_infop info_ptr) info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; } } +#endif +#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) + if (info_ptr->unknown_chunks_num) + { + png_unknown_chunk *up; + + png_debug(5, "writing extra chunks\n"); + + 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 } @@ -215,10 +384,17 @@ png_write_end(png_structp png_ptr, png_infop info_ptr) /* write end of PNG file */ png_write_IEND(png_ptr); +#if 0 +/* This flush, added in libpng-1.0.8, causes some applications to crash + because they do not set png_ptr->output_flush_fn */ + png_flush(png_ptr); +#endif } #if defined(PNG_WRITE_tIME_SUPPORTED) -void +#if !defined(_WIN32_WCE) +/* "time.h" functions are not supported on WindowsCE */ +void PNGAPI png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime) { png_debug(1, "in png_convert_from_struct_tm\n"); @@ -230,7 +406,7 @@ png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime) ptime->second = (png_byte)ttime->tm_sec; } -void +void PNGAPI png_convert_from_time_t(png_timep ptime, time_t ttime) { struct tm *tbuf; @@ -240,38 +416,55 @@ png_convert_from_time_t(png_timep ptime, time_t ttime) png_convert_from_struct_tm(ptime, tbuf); } #endif +#endif /* Initialize png_ptr structure, and allocate any memory needed */ -png_structp +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) { #ifdef PNG_USER_MEM_SUPPORTED return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn, - warn_fn, NULL, NULL, NULL)); + warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL)); } /* Alternate initialize png_ptr structure, and allocate any memory needed */ -png_structp +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) { #endif /* PNG_USER_MEM_SUPPORTED */ png_structp png_ptr; +#ifdef PNG_SETJMP_SUPPORTED #ifdef USE_FAR_KEYWORD jmp_buf jmpbuf; #endif +#endif + int i; png_debug(1, "in png_create_write_struct\n"); #ifdef PNG_USER_MEM_SUPPORTED - if ((png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, - (png_malloc_ptr)malloc_fn)) == NULL) + png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, + (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr); #else - if ((png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG)) == NULL) + png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); #endif /* PNG_USER_MEM_SUPPORTED */ - { - return ((png_structp)NULL); - } + if (png_ptr == NULL) + return (NULL); + +#if !defined(PNG_1_0_X) +#ifdef PNG_ASSEMBLER_CODE_SUPPORTED + png_init_mmx_flags(png_ptr); /* 1.2.0 addition */ +#endif +#endif /* PNG_1_0_X */ + + /* 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 #ifdef USE_FAR_KEYWORD if (setjmp(jmpbuf)) #else @@ -279,27 +472,56 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, #endif { png_free(png_ptr, png_ptr->zbuf); + png_ptr->zbuf=NULL; png_destroy_struct(png_ptr); - return ((png_structp)NULL); + return (NULL); } #ifdef USE_FAR_KEYWORD - png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf)); + png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf)); +#endif #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); - /* 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] || - (png_libpng_ver[0] == '0' && user_png_ver[2] < '9')) + i=0; + do { - png_error(png_ptr, - "Incompatible libpng version in application and library"); + 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')) + { +#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) + char msg[80]; + if (user_png_ver) + { + sprintf(msg, "Application was compiled with png.h from libpng-%.20s", + user_png_ver); + png_warning(png_ptr, msg); + } + sprintf(msg, "Application is running with png.c from libpng-%.20s", + png_libpng_ver); + png_warning(png_ptr, msg); +#endif +#ifdef PNG_ERROR_NUMBERS_SUPPORTED + png_ptr->flags=0; +#endif + png_error(png_ptr, + "Incompatible libpng version in application and library"); + } } /* initialize zbuf - compression buffer */ @@ -307,41 +529,152 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, (png_uint_32)png_ptr->zbuf_size); - png_set_write_fn(png_ptr, NULL, NULL, NULL); + png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL, + png_flush_ptr_NULL); #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT, - 1, NULL, NULL); + 1, png_doublep_NULL, png_doublep_NULL); #endif - return ((png_structp)png_ptr); +#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(jmpbuf)) + PNG_ABORT(); + png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf)); +#else + if (setjmp(png_ptr->jmpbuf)) + PNG_ABORT(); +#endif +#endif + return (png_ptr); } /* Initialize png_ptr structure, and allocate any memory needed */ -void +#undef png_write_init +void PNGAPI png_write_init(png_structp png_ptr) { + /* We only come here via pre-1.0.7-compiled applications */ + png_write_init_2(png_ptr, "1.0.6 or earlier", 0, 0); +} + +void PNGAPI +png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver, + png_size_t png_struct_size, png_size_t png_info_size) +{ + /* We only come here via pre-1.0.12-compiled applications */ +#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) + if(png_sizeof(png_struct) > png_struct_size || + png_sizeof(png_info) > png_info_size) + { + char msg[80]; + png_ptr->warning_fn=NULL; + if (user_png_ver) + { + sprintf(msg, "Application was compiled with png.h from libpng-%.20s", + user_png_ver); + png_warning(png_ptr, msg); + } + sprintf(msg, "Application is running with png.c from libpng-%.20s", + png_libpng_ver); + png_warning(png_ptr, msg); + } +#endif + if(png_sizeof(png_struct) > png_struct_size) + { + png_ptr->error_fn=NULL; +#ifdef PNG_ERROR_NUMBERS_SUPPORTED + png_ptr->flags=0; +#endif + png_error(png_ptr, + "The png struct allocated by the application for writing is too small."); + } + if(png_sizeof(png_info) > png_info_size) + { + png_ptr->error_fn=NULL; +#ifdef PNG_ERROR_NUMBERS_SUPPORTED + png_ptr->flags=0; +#endif + png_error(png_ptr, + "The info struct allocated by the application for writing is too small."); + } + png_write_init_3(&png_ptr, user_png_ver, png_struct_size); +} + + +void PNGAPI +png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver, + png_size_t png_struct_size) +{ + png_structp png_ptr=*ptr_ptr; +#ifdef PNG_SETJMP_SUPPORTED jmp_buf tmp_jmp; /* to save current jump buffer */ +#endif + int i = 0; + do + { + if (user_png_ver[i] != png_libpng_ver[i]) + { +#ifdef PNG_LEGACY_SUPPORTED + png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; +#else + png_ptr->warning_fn=NULL; + png_warning(png_ptr, + "Application uses deprecated png_write_init() and should be recompiled."); + break; +#endif + } + } while (png_libpng_ver[i++]); - png_debug(1, "in png_write_init\n"); + png_debug(1, "in png_write_init_3\n"); + +#ifdef PNG_SETJMP_SUPPORTED /* save jump buffer and error functions */ - png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf)); + png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf)); +#endif + + if (png_sizeof(png_struct) > png_struct_size) + { + png_destroy_struct(png_ptr); + png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); + *ptr_ptr = png_ptr; + } /* reset all variables to 0 */ - png_memset(png_ptr, 0, sizeof (png_struct)); + png_memset(png_ptr, 0, png_sizeof (png_struct)); + /* 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 + +#if !defined(PNG_1_0_X) +#ifdef PNG_ASSEMBLER_CODE_SUPPORTED + png_init_mmx_flags(png_ptr); /* 1.2.0 addition */ +#endif +#endif /* PNG_1_0_X */ + +#ifdef PNG_SETJMP_SUPPORTED /* restore jump buffer */ - png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf)); + png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf)); +#endif + + png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL, + png_flush_ptr_NULL); /* initialize zbuf - compression buffer */ png_ptr->zbuf_size = PNG_ZBUF_SIZE; png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, (png_uint_32)png_ptr->zbuf_size); - png_set_write_fn(png_ptr, NULL, NULL, NULL); #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT, - 1, NULL, NULL); + 1, png_doublep_NULL, png_doublep_NULL); #endif } @@ -350,7 +683,7 @@ png_write_init(png_structp png_ptr) * have called png_set_interlace_handling(), you will have to * "write" the image seven times. */ -void +void PNGAPI png_write_rows(png_structp png_ptr, png_bytepp row, png_uint_32 num_rows) { @@ -368,7 +701,7 @@ png_write_rows(png_structp png_ptr, png_bytepp row, /* Write the image. You only need to call this function once, even * if you are writing an interlaced image. */ -void +void PNGAPI png_write_image(png_structp png_ptr, png_bytepp image) { png_uint_32 i; /* row index */ @@ -395,7 +728,7 @@ png_write_image(png_structp png_ptr, png_bytepp image) } /* called by user to write a row of image data */ -void +void PNGAPI png_write_row(png_structp png_ptr, png_bytep row) { png_debug2(1, "in png_write_row (row %ld, pass %d)\n", @@ -403,6 +736,11 @@ png_write_row(png_structp png_ptr, png_bytep row) /* 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) @@ -443,49 +781,49 @@ png_write_row(png_structp png_ptr, png_bytep row) switch (png_ptr->pass) { case 0: - if (png_ptr->row_number & 7) + if (png_ptr->row_number & 0x07) { png_write_finish_row(png_ptr); return; } break; case 1: - if ((png_ptr->row_number & 7) || png_ptr->width < 5) + 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 & 7) != 4) + if ((png_ptr->row_number & 0x07) != 4) { png_write_finish_row(png_ptr); return; } break; case 3: - if ((png_ptr->row_number & 3) || png_ptr->width < 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 & 3) != 2) + if ((png_ptr->row_number & 0x03) != 2) { png_write_finish_row(png_ptr); return; } break; case 5: - if ((png_ptr->row_number & 1) || png_ptr->width < 2) + 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 & 1)) + if (!(png_ptr->row_number & 0x01)) { png_write_finish_row(png_ptr); return; @@ -503,15 +841,15 @@ png_write_row(png_structp png_ptr, png_bytep row) 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_ptr->row_info.width * - (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3); + 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\n", png_ptr->row_info.color_type); - png_debug1(3, "row_info->width = %d\n", png_ptr->row_info.width); + png_debug1(3, "row_info->width = %lu\n", png_ptr->row_info.width); png_debug1(3, "row_info->channels = %d\n", png_ptr->row_info.channels); png_debug1(3, "row_info->bit_depth = %d\n", png_ptr->row_info.bit_depth); png_debug1(3, "row_info->pixel_depth = %d\n", png_ptr->row_info.pixel_depth); - png_debug1(3, "row_info->rowbytes = %d\n", png_ptr->row_info.rowbytes); + png_debug1(3, "row_info->rowbytes = %lu\n", png_ptr->row_info.rowbytes); /* Copy user's row into buffer, leaving room for filter byte. */ png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row, @@ -537,6 +875,24 @@ png_write_row(png_structp png_ptr, png_bytep row) if (png_ptr->transformations) png_do_write_transformations(png_ptr); +#if defined(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)); @@ -546,7 +902,7 @@ png_write_row(png_structp png_ptr, png_bytep row) #if defined(PNG_WRITE_FLUSH_SUPPORTED) /* Set the automatic flush interval or 0 to turn flushing off */ -void +void PNGAPI png_set_flush(png_structp png_ptr, int nrows) { png_debug(1, "in png_set_flush\n"); @@ -554,7 +910,7 @@ png_set_flush(png_structp png_ptr, int nrows) } /* flush the current output buffers now */ -void +void PNGAPI png_write_flush(png_structp png_ptr) { int wrote_IDAT; @@ -607,13 +963,14 @@ png_write_flush(png_structp png_ptr) #endif /* PNG_WRITE_FLUSH_SUPPORTED */ /* free all memory used by the write */ -void +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\n"); @@ -622,6 +979,7 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr) png_ptr = *png_ptr_ptr; #ifdef PNG_USER_MEM_SUPPORTED free_fn = png_ptr->free_fn; + mem_ptr = png_ptr->mem_ptr; #endif } @@ -630,48 +988,47 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr) if (info_ptr != NULL) { -#ifdef PNG_WRITE_tEXt_SUPPORTED - png_free(png_ptr, info_ptr->text); -#endif -#if defined(PNG_READ_pCAL_SUPPORTED) - png_free(png_ptr, info_ptr->pcal_purpose); - png_free(png_ptr, info_ptr->pcal_units); - if (info_ptr->pcal_params != NULL) + png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); + +#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) + if (png_ptr->num_chunk_list) { - int i; - for (i = 0; i < (int)info_ptr->pcal_nparams; i++) - { - png_free(png_ptr, info_ptr->pcal_params[i]); - } - png_free(png_ptr, info_ptr->pcal_params); + png_free(png_ptr, png_ptr->chunk_list); + png_ptr->chunk_list=NULL; + png_ptr->num_chunk_list=0; } #endif + #ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)info_ptr, free_fn); + 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 = (png_infop)NULL; + *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, free_fn); + 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 = (png_structp)NULL; + *png_ptr_ptr = NULL; } } /* Free any memory used in png_ptr struct (old method) */ -void +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; @@ -691,19 +1048,23 @@ png_write_destroy(png_structp png_ptr) png_free(png_ptr, png_ptr->up_row); png_free(png_ptr, png_ptr->avg_row); png_free(png_ptr, png_ptr->paeth_row); + #if defined(PNG_TIME_RFC1123_SUPPORTED) png_free(png_ptr, png_ptr->time_buffer); -#endif /* PNG_TIME_RFC1123_SUPPORTED */ +#endif + #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) png_free(png_ptr, png_ptr->prev_filters); png_free(png_ptr, png_ptr->filter_weights); png_free(png_ptr, png_ptr->inv_filter_weights); png_free(png_ptr, png_ptr->filter_costs); png_free(png_ptr, png_ptr->inv_filter_costs); -#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ +#endif +#ifdef PNG_SETJMP_SUPPORTED /* reset structure */ - png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf)); + png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf)); +#endif error_fn = png_ptr->error_fn; warning_fn = png_ptr->warning_fn; @@ -712,7 +1073,7 @@ png_write_destroy(png_structp png_ptr) free_fn = png_ptr->free_fn; #endif - png_memset(png_ptr, 0, sizeof (png_struct)); + png_memset(png_ptr, 0, png_sizeof (png_struct)); png_ptr->error_fn = error_fn; png_ptr->warning_fn = warning_fn; @@ -721,15 +1082,21 @@ png_write_destroy(png_structp png_ptr) png_ptr->free_fn = free_fn; #endif - png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf)); +#ifdef PNG_SETJMP_SUPPORTED + png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf)); +#endif } /* Allow the application to select one or more row filters to use. */ -void +void PNGAPI png_set_filter(png_structp png_ptr, int method, int filters) { png_debug(1, "in png_set_filter\n"); - /* We allow 'method' only for future expansion of the base filter method. */ +#if defined(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)) @@ -756,14 +1123,14 @@ png_set_filter(png_structp png_ptr, int method, int filters) */ if (png_ptr->row_buf != NULL) { - if (png_ptr->do_filter & PNG_FILTER_SUB && png_ptr->sub_row == NULL) + 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->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL) { if (png_ptr->prev_row == NULL) { @@ -778,7 +1145,7 @@ png_set_filter(png_structp png_ptr, int method, int filters) } } - if (png_ptr->do_filter & PNG_FILTER_AVG && png_ptr->avg_row == NULL) + if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL) { if (png_ptr->prev_row == NULL) { @@ -793,13 +1160,13 @@ png_set_filter(png_structp png_ptr, int method, int filters) } } - if (png_ptr->do_filter & PNG_FILTER_PAETH && + 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_FILTER_PAETH; + png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH); } else { @@ -825,7 +1192,7 @@ png_set_filter(png_structp png_ptr, int method, int filters) * better compression. */ #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* GRR 970116 */ -void +void PNGAPI png_set_filter_heuristics(png_structp png_ptr, int heuristic_method, int num_weights, png_doublep filter_weights, png_doublep filter_costs) @@ -850,15 +1217,15 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method, num_weights = 0; } - png_ptr->num_prev_filters = num_weights; - png_ptr->heuristic_method = heuristic_method; + png_ptr->num_prev_filters = (png_byte)num_weights; + png_ptr->heuristic_method = (png_byte)heuristic_method; if (num_weights > 0) { if (png_ptr->prev_filters == NULL) { png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr, - (png_uint_32)(sizeof(png_byte) * num_weights)); + (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++) @@ -869,12 +1236,11 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method, if (png_ptr->filter_weights == NULL) { - png_ptr->filter_weights = (png_uint_16p) png_malloc(png_ptr, - (png_uint_32)(sizeof(png_uint_16) * num_weights)); - - png_ptr->inv_filter_weights = (png_uint_16p) png_malloc(png_ptr, - (png_uint_32)(sizeof(png_uint_16) * num_weights)); + 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] = @@ -904,11 +1270,11 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method, */ if (png_ptr->filter_costs == NULL) { - png_ptr->filter_costs = (png_uint_16p) png_malloc(png_ptr, - (png_uint_32)(sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST)); + 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)(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++) { @@ -942,7 +1308,7 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method, } #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ -void +void PNGAPI png_set_compression_level(png_structp png_ptr, int level) { png_debug(1, "in png_set_compression_level\n"); @@ -950,7 +1316,7 @@ png_set_compression_level(png_structp png_ptr, int level) png_ptr->zlib_level = level; } -void +void PNGAPI png_set_compression_mem_level(png_structp png_ptr, int mem_level) { png_debug(1, "in png_set_compression_mem_level\n"); @@ -958,7 +1324,7 @@ png_set_compression_mem_level(png_structp png_ptr, int mem_level) png_ptr->zlib_mem_level = mem_level; } -void +void PNGAPI png_set_compression_strategy(png_structp png_ptr, int strategy) { png_debug(1, "in png_set_compression_strategy\n"); @@ -966,16 +1332,26 @@ png_set_compression_strategy(png_structp png_ptr, int strategy) png_ptr->zlib_strategy = strategy; } -void +void PNGAPI png_set_compression_window_bits(png_structp png_ptr, int window_bits) { 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 +void PNGAPI png_set_compression_method(png_structp png_ptr, int method) { png_debug(1, "in png_set_compression_method\n"); @@ -985,14 +1361,14 @@ png_set_compression_method(png_structp png_ptr, int method) png_ptr->zlib_method = method; } -void +void PNGAPI png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn) { png_ptr->write_row_fn = write_row_fn; } #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) -void +void PNGAPI png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr write_user_transform_fn) { @@ -1002,3 +1378,87 @@ png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr } #endif + +#if defined(PNG_INFO_IMAGE_SUPPORTED) +void PNGAPI +png_write_png(png_structp png_ptr, png_infop info_ptr, + int transforms, voidp params) +{ +#if defined(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 + + /* Write the file header information. */ + png_write_info(png_ptr, info_ptr); + + /* ------ these transformations don't touch the info structure ------- */ + +#if defined(PNG_WRITE_INVERT_SUPPORTED) + /* invert monochrome pixels */ + if (transforms & PNG_TRANSFORM_INVERT_MONO) + png_set_invert_mono(png_ptr); +#endif + +#if defined(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 + +#if defined(PNG_WRITE_PACK_SUPPORTED) + /* pack pixels into bytes */ + if (transforms & PNG_TRANSFORM_PACKING) + png_set_packing(png_ptr); +#endif + +#if defined(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 + +#if defined(PNG_WRITE_FILLER_SUPPORTED) + /* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into + * RGB (4 channels -> 3 channels). The second parameter is not used. + */ + if (transforms & PNG_TRANSFORM_STRIP_FILLER) + png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE); +#endif + +#if defined(PNG_WRITE_BGR_SUPPORTED) + /* flip BGR pixels to RGB */ + if (transforms & PNG_TRANSFORM_BGR) + png_set_bgr(png_ptr); +#endif + +#if defined(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 + +#if defined(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 + + /* ----------------------- 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); + + if(transforms == 0 || params == NULL) + /* quiet compiler warnings */ return; +} +#endif +#endif /* PNG_WRITE_SUPPORTED */