X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/c801d85f158c4cba50b588807daabdcbd0ed3853..94e0018723919fe2ca2f5b5f0a42804c16dbf3a1:/src/png/pngwrite.c diff --git a/src/png/pngwrite.c b/src/png/pngwrite.c index 9980027e30..0252051989 100644 --- a/src/png/pngwrite.c +++ b/src/png/pngwrite.c @@ -1,152 +1,305 @@ - + /* pngwrite.c - general routines to write a PNG file * - * libpng 1.0.1 - * 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, Glenn Randers-Pehrson - * March 15, 1998 + * Last changed in libpng 1.4.0 [January 3, 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 */ -/* get internal access to png.h */ -#define PNG_INTERNAL +/* Get internal access to png.h */ +#define PNG_NO_PEDANTIC_WARNINGS #include "png.h" +#ifdef PNG_WRITE_SUPPORTED +#include "pngpriv.h" /* 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 encurage + * 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 -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_before_PLTE"); - png_debug(1, "in png_write_info\n"); - png_write_sig(png_ptr); /* write PNG signature */ - /* write IHDR information. */ + 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, -#if defined(PNG_WRITE_INTERLACING_SUPPORTED) +#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. */ -#if defined(PNG_WRITE_gAMA_SUPPORTED) + /* 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) + { +# 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 -#if defined(PNG_WRITE_sRGB_SUPPORTED) + } +#endif +#ifdef 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_sBIT_SUPPORTED) +#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, + 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 -#if defined(PNG_WRITE_cHRM_SUPPORTED) +#ifdef 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 +#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\n"); + png_error(png_ptr, "Valid palette required for paletted images"); -#if defined(PNG_WRITE_tRNS_SUPPORTED) +#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) { -#if defined(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[j] = 255 - info_ptr->trans[j]; - } + 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, &(info_ptr->trans_values), + png_write_tRNS(png_ptr, info_ptr->trans_alpha, &(info_ptr->trans_color), info_ptr->num_trans, info_ptr->color_type); - } + } #endif -#if defined(PNG_WRITE_bKGD_SUPPORTED) +#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 -#if defined(PNG_WRITE_hIST_SUPPORTED) +#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 -#if defined(PNG_WRITE_oFFs_SUPPORTED) +#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 -#if defined(PNG_WRITE_pCAL_SUPPORTED) +#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 -#if defined(PNG_WRITE_pHYs_SUPPORTED) + +#ifdef PNG_sCAL_SUPPORTED + if (info_ptr->valid & PNG_INFO_sCAL) +#ifdef PNG_WRITE_sCAL_SUPPORTED +#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED) + png_write_sCAL(png_ptr, (int)info_ptr->scal_unit, + info_ptr->scal_pixel_width, info_ptr->scal_pixel_height); +#else /* !FLOATING_POINT */ +#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); +#endif /* FIXED_POINT */ +#endif /* FLOATING_POINT */ +#else /* !WRITE_sCAL */ + png_warning(png_ptr, + "png_write_sCAL not supported; sCAL chunk not written"); +#endif /* WRITE_sCAL */ +#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 -#if defined(PNG_WRITE_tIME_SUPPORTED) +#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->flags |= PNG_FLAG_WROTE_tIME; + png_ptr->mode |= PNG_WROTE_tIME; } -#endif -#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) +#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\n", 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 */ - 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 */ +#ifdef 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"); + 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) { -#if defined(PNG_WRITE_tEXt_SUPPORTED) - /* write uncompressed chunk */ +#ifdef 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); -#else - png_warning(png_ptr, "Unable to write uncompressed text\n"); -#endif + 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 @@ -157,109 +310,128 @@ 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"); + 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 */ + /* See if user wants us to write information chunks */ if (info_ptr != NULL) { -#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) +#ifdef 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)) +#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 -#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) - /* loop through comment chunks */ +#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\n", i, + png_debug2(2, "Writing trailer text chunk %d, type %d", 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_zTXt_SUPPORTED) - /* write compressed chunk */ +#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, 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"); + 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) { -#if defined(PNG_WRITE_tEXt_SUPPORTED) - /* write uncompressed chunk */ +#ifdef 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"); + 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 */ + /* Write end of PNG file */ png_write_IEND(png_ptr); -} - -#if defined(PNG_TIME_RFC1123_SUPPORTED) -/* Convert the supplied time into an RFC 1123 string suitable for use in - * a "Creation Time" or other text-based time string. - */ -png_charp -png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime) -{ - static PNG_CONST char short_months[12][4] = - {"Jan", "Feb", "Mar", "Apr", "May", "Jun", - "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; - - if (png_ptr->time_buffer == NULL) - { - png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29* - sizeof(char))); - } - -#ifdef USE_FAR_KEYWORD - { - char near_time_buf[29]; - sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000", - ptime->day % 31, short_months[ptime->month - 1], - ptime->year, ptime->hour % 24, ptime->minute % 60, - ptime->second % 61); - png_memcpy(png_ptr->time_buffer, near_time_buf, - 29*sizeof(char)); - } -#else - sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000", - ptime->day % 31, short_months[ptime->month - 1], - ptime->year, ptime->hour % 24, ptime->minute % 60, - ptime->second % 61); + /* 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 - return ((png_charp)png_ptr->time_buffer); } -#endif /* PNG_TIME_RFC1123_SUPPORTED */ -#if defined(PNG_WRITE_tIME_SUPPORTED) -void +#ifdef PNG_CONVERT_tIME_SUPPORTED +/* "tm" structure is 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"); + 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; @@ -268,116 +440,180 @@ 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; - png_debug(1, "in png_convert_from_time_t\n"); + 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_structp -png_create_write_struct(png_const_charp user_png_ver, voidp error_ptr, +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)); +} + +/* Alternate initialize png_ptr structure, and allocate any memory needed */ +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 */ + 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 jmpbuf; #endif - png_debug(1, "in png_create_write_struct\n"); - if ((png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG)) == NULL) - { - return ((png_structp)NULL); - } +#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(jmpbuf)) #else - if (setjmp(png_ptr->jmpbuf)) + if (setjmp(png_jmpbuf(png_ptr))) /* sets longjmp to match setjmp */ #endif - { - png_free(png_ptr, png_ptr->zbuf); - png_destroy_struct(png_ptr); - return ((png_structp)NULL); - } #ifdef USE_FAR_KEYWORD - png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf)); + png_memcpy(png_jmpbuf(png_ptr), 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); - /* 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')) + if (user_png_ver) { - png_error(png_ptr, - "Incompatible libpng version in application and library"); + 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_STDIO_SUPPORTED + char msg[80]; + if (user_png_ver) + { + png_snprintf(msg, 80, + "Application was compiled with png.h from libpng-%.20s", + user_png_ver); + png_warning(png_ptr, msg); + } + png_snprintf(msg, 80, + "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_warning(png_ptr, + "Incompatible libpng version in application and library"); + png_cleanup_needed = 1; + } } - /* initialize zbuf - compression buffer */ + /* 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); + 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); -#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT, 1, NULL, NULL); #endif - return ((png_structp)png_ptr); + return (png_ptr); } -/* Initialize png_ptr structure, and allocate any memory needed */ -void -png_write_init(png_structp png_ptr) -{ - jmp_buf tmp_jmp; /* to save current jump buffer */ - - png_debug(1, "in png_write_init\n"); - /* save jump buffer and error functions */ - png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf)); - - /* reset all variables to 0 */ - png_memset(png_ptr, 0, sizeof (png_struct)); - - /* restore jump buffer */ - png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf)); - - /* 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); -#endif -} - /* 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 +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\n"); - /* loop through the rows */ + 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); @@ -387,25 +623,30 @@ 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 */ int pass, num_pass; /* pass variables */ png_bytepp rp; /* points to current row */ - png_debug(1, "in png_write_image\n"); -#if defined(PNG_WRITE_INTERLACING_SUPPORTED) - /* intialize interlace handling. If image is not interlaced, - this will set pass to 1 */ + 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 */ + /* Loop through passes */ for (pass = 0; pass < num_pass; pass++) { - /* loop through image */ + /* Loop through image */ for (i = 0, rp = image; i < png_ptr->height; i++, rp++) { png_write_row(png_ptr, *rp); @@ -413,68 +654,109 @@ png_write_image(png_structp png_ptr, png_bytepp image) } } -/* called by user to write a row of image data */ -void +/* Called by user to write a row of image data */ +void PNGAPI png_write_row(png_structp png_ptr, png_bytep row) { - png_debug2(1, "in png_write_row (row %ld, pass %d)\n", + if (png_ptr == NULL) + return; + + png_debug2(1, "in png_write_row (row %ld, pass %d)", png_ptr->row_number, png_ptr->pass); - /* initialize transformations and other stuff if first time */ + + /* 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); } -#if defined(PNG_WRITE_INTERLACING_SUPPORTED) - /* if interlaced and not interested in row, return */ +#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 & 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; @@ -484,7 +766,7 @@ png_write_row(png_structp png_ptr, png_bytep row) } #endif - /* set up row info for transformations */ + /* 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; @@ -492,28 +774,27 @@ 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->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->color_type = %d", png_ptr->row_info.color_type); + png_debug1(3, "row_info->width = %lu", 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 = %lu", 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, - png_ptr->row_info.rowbytes); + png_memcpy(png_ptr->row_buf + 1, row, png_ptr->row_info.rowbytes); -#if defined(PNG_WRITE_INTERLACING_SUPPORTED) - /* handle interlacing */ +#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 ... */ + /* This should always get caught above, but still ... */ if (!(png_ptr->row_info.width)) { png_write_finish_row(png_ptr); @@ -522,10 +803,28 @@ png_write_row(png_structp png_ptr, png_bytep row) } #endif - /* handle other transformations */ + /* 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)); @@ -533,35 +832,41 @@ png_write_row(png_structp png_ptr, png_bytep row) (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass); } -#if defined(PNG_WRITE_FLUSH_SUPPORTED) +#ifdef 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"); + 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 +/* 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\n"); + 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; + return; do { int ret; - /* compress the data */ + /* Compress the data */ ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH); wrote_IDAT = 0; - /* check for compression errors */ + /* Check for compression errors */ if (ret != Z_OK) { if (png_ptr->zstream.msg != NULL) @@ -572,7 +877,7 @@ png_write_flush(png_structp png_ptr) if (!(png_ptr->zstream.avail_out)) { - /* write the IDAT and reset the zlib output buffer */ + /* 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; @@ -584,7 +889,7 @@ png_write_flush(png_structp png_ptr) /* 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 */ + /* 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; @@ -595,118 +900,182 @@ png_write_flush(png_structp png_ptr) } #endif /* PNG_WRITE_FLUSH_SUPPORTED */ -/* free all memory used by the write */ -void +/* 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"); - png_debug(1, "in png_destroy_write_struct\n"); 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) { -#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) + if (png_ptr != NULL) { - 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_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); - *info_ptr_ptr = (png_infop)NULL; +#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); - *png_ptr_ptr = (png_structp)NULL; +#endif + *png_ptr_ptr = NULL; } } /* Free any memory used in png_ptr struct (old method) */ -void +void /* PRIVATE */ png_write_destroy(png_structp png_ptr) { - jmp_buf tmp_jmp; /* save jump buffer */ +#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\n"); - /* free any memory zlib uses */ + 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. */ + /* 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); -#if defined(PNG_TIME_RFC1123_SUPPORTED) +#endif + +#ifdef PNG_TIME_RFC1123_SUPPORTED png_free(png_ptr, png_ptr->time_buffer); -#endif /* PNG_TIME_RFC1123_SUPPORTED */ -#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) +#endif + +#ifdef 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 - /* reset structure */ - png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf)); +#ifdef PNG_SETJMP_SUPPORTED + /* Reset structure */ + png_memcpy(tmp_jmp, png_ptr->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, sizeof (png_struct)); + 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 - 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. */ + 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"); - case PNG_FILTER_VALUE_NONE: png_ptr->do_filter=PNG_FILTER_NONE; break; - 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; +#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 @@ -720,14 +1089,15 @@ 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) +#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->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL) { if (png_ptr->prev_row == NULL) { @@ -742,7 +1112,7 @@ 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) { @@ -757,13 +1127,13 @@ 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 { @@ -774,6 +1144,7 @@ png_set_filter(png_structp png_ptr, int method, int filters) } if (png_ptr->do_filter == PNG_NO_FILTERS) +#endif /* PNG_WRITE_FILTER_SUPPORTED */ png_ptr->do_filter = PNG_FILTER_NONE; } } @@ -788,17 +1159,18 @@ png_set_filter(png_structp png_ptr, int method, int filters) * filtered data going to zlib more consistent, hopefully resulting in * better compression. */ -#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* GRR 970116 */ -void +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* GRR 970116 */ +void PNGAPI png_set_filter_heuristics(png_structp png_ptr, int heuristic_method, int num_weights, png_doublep filter_weights, png_doublep filter_costs) { -#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) int i; -#endif - png_debug(1, "in png_set_filter_heuristics\n"); + png_debug(1, "in png_set_filter_heuristics"); + + if (png_ptr == NULL) + return; if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST) { png_warning(png_ptr, "Unknown filter heuristic method"); @@ -816,15 +1188,15 @@ 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++) @@ -835,12 +1207,11 @@ 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] = @@ -870,11 +1241,11 @@ 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++) { @@ -908,63 +1279,179 @@ 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"); + 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 +void PNGAPI png_set_compression_mem_level(png_structp png_ptr, int mem_level) { - png_debug(1, "in png_set_compression_mem_level\n"); + 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 +void PNGAPI png_set_compression_strategy(png_structp png_ptr, int strategy) { - png_debug(1, "in png_set_compression_strategy\n"); + 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 +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 +void PNGAPI png_set_compression_method(png_structp png_ptr, int method) { - png_debug(1, "in png_set_compression_method\n"); + 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 +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; } -#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) -void +#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\n"); + 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 */