pngwrite.c
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上传日期:2015-04-09
资源大小:43957k
文件大小:49k
- /* pngwrite.c - general routines to write a PNG file
- *
- * Last changed in libpng 1.2.9 April 14, 2006
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2006 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,
- * 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_PLTEn");
- if (png_ptr == NULL || info_ptr == NULL)
- return;
- 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");
- 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)
- 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)
- 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 chunksn");
- 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_infon");
- 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");
- #if defined(PNG_WRITE_tRNS_SUPPORTED)
- if (info_ptr->valid & PNG_INFO_tRNS)
- {
- #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] = (png_byte)(255 - info_ptr->trans[j]);
- }
- #endif
- png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
- info_ptr->num_trans, info_ptr->color_type);
- }
- #endif
- #if defined(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)
- 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)
- 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)
- 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_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.");
- #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,
- info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
- #endif
- #if defined(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
- #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 %dn", 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");
- #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)
- {
- #if defined(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)
- {
- #if defined(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
- #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
- if (info_ptr->unknown_chunks_num)
- {
- png_unknown_chunk *up;
- png_debug(5, "writing extra chunksn");
- 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_endn");
- 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)
- {
- #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->mode & PNG_WROTE_tIME))
- png_write_tIME(png_ptr, &(info_ptr->mod_time));
- #endif
- #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 %dn", 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");
- #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, 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)
- {
- #if defined(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
- #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
- if (info_ptr->unknown_chunks_num)
- {
- png_unknown_chunk *up;
- png_debug(5, "writing extra chunksn");
- 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);
- #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)
- #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_tmn");
- 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_tn");
- tbuf = gmtime(&ttime);
- png_convert_from_struct_tm(ptime, tbuf);
- }
- #endif
- #endif
- /* Initialize png_ptr structure, and allocate any memory needed */
- 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, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_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 */
- 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_structn");
- #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);
- #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
- if (setjmp(png_ptr->jmpbuf))
- #endif
- {
- png_free(png_ptr, png_ptr->zbuf);
- png_ptr->zbuf=NULL;
- png_destroy_struct(png_ptr);
- return (NULL);
- }
- #ifdef USE_FAR_KEYWORD
- 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);
- 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'))
- {
- #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 */
- 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, 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, png_doublep_NULL, png_doublep_NULL);
- #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))
- 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 */
- #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
- /* Deprecated. */
- #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);
- }
- #endif /* PNG_1_0_X || PNG_1_2_X */
- 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;
- if (png_ptr == NULL)
- return;
- 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_3n");
- #ifdef PNG_SETJMP_SUPPORTED
- /* save jump buffer and error functions */
- 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, 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, 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);
- #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
- png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
- 1, png_doublep_NULL, png_doublep_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 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_rowsn");
- 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_imagen");
- #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
- /* intialize 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_bytep row)
- {
- if (png_ptr == NULL)
- return;
- png_debug2(1, "in png_write_row (row %ld, pass %d)n",
- 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);
- }
- #if defined(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;
- }
- }
- #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 = %dn", png_ptr->row_info.color_type);
- png_debug1(3, "row_info->width = %lun", png_ptr->row_info.width);
- png_debug1(3, "row_info->channels = %dn", png_ptr->row_info.channels);
- png_debug1(3, "row_info->bit_depth = %dn", png_ptr->row_info.bit_depth);
- png_debug1(3, "row_info->pixel_depth = %dn", png_ptr->row_info.pixel_depth);
- png_debug1(3, "row_info->rowbytes = %lun", 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);
- #if defined(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);
- #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));
- if (png_ptr->write_row_fn != NULL)
- (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
- }
- #if defined(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_flushn");
- 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_flushn");
- 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_structn");
- 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
- }
- if (info_ptr_ptr != NULL)
- info_ptr = *info_ptr_ptr;
- if (info_ptr != NULL)
- {
- png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
- #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
- if (png_ptr->num_chunk_list)
- {
- 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, (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_destroyn");
- /* 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);
- 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)
- png_free(png_ptr, png_ptr->time_buffer);
- #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
- #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, 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->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_filtern");
- if (png_ptr == NULL)
- return;
- #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))
- {
- 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;
- default: png_ptr->do_filter = (png_byte)filters; break;
- }
- /* 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)
- {
- 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_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_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)
- 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.
- */
- #if defined(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)
- {
- int i;
- png_debug(1, "in png_set_filter_heuristicsn");
- if (png_ptr == NULL)
- return;
- if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)
- {
- png_warning(png_ptr, "Unknown filter heuristic method");
- return;
- }
- if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT)
- {
- heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
- }
- if (num_weights < 0 || filter_weights == NULL ||
- heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
- {
- num_weights = 0;
- }
- 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)(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;
- }
- }
- if (png_ptr->filter_weights == NULL)
- {
- 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;
- }
- }
- 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)((double)PNG_WEIGHT_FACTOR*filter_weights[i]+0.5);
- png_ptr->filter_weights[i] =
- (png_uint_16)((double)PNG_WEIGHT_FACTOR/filter_weights[i]+0.5);
- }
- }
- }
- /* 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;
- }
- }
- /* 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 == NULL || filter_costs[i] < 0.0)
- {
- png_ptr->inv_filter_costs[i] =
- png_ptr->filter_costs[i] = PNG_COST_FACTOR;
- }
- else if (filter_costs[i] >= 1.0)
- {
- png_ptr->inv_filter_costs[i] =
- (png_uint_16)((double)PNG_COST_FACTOR / filter_costs[i] + 0.5);
- png_ptr->filter_costs[i] =
- (png_uint_16)((double)PNG_COST_FACTOR * filter_costs[i] + 0.5);
- }
- }
- }
- #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_leveln");
- 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_leveln");
- 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_strategyn");
- 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_methodn");
- 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;
- }
- #if defined(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_fnn");
- if (png_ptr == NULL)
- return;
- png_ptr->transformations |= PNG_USER_TRANSFORM;
- png_ptr->write_user_transform_fn = write_user_transform_fn;
- }
- #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 (png_ptr == NULL || info_ptr == NULL)
- return;
- #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 */