| |
| /* pngwrite.c - general routines to write a PNG file |
| * |
| * Last changed in libpng 1.4.15 [February 12, 2015] |
| * Copyright (c) 1998-2002,2004,2006-2015 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_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 encourage |
| * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing |
| * the chunk, as that will keep the code from breaking if you want to just |
| * write a plain PNG file. If you have long comments, I suggest writing |
| * them in png_write_end(), and compressing them. |
| */ |
| void PNGAPI |
| png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr) |
| { |
| png_debug(1, "in png_write_info_before_PLTE"); |
| |
| if (png_ptr == NULL || info_ptr == NULL) |
| return; |
| if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE)) |
| { |
| /* Write PNG signature */ |
| png_write_sig(png_ptr); |
| #ifdef PNG_MNG_FEATURES_SUPPORTED |
| if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) && \ |
| (png_ptr->mng_features_permitted)) |
| { |
| png_warning(png_ptr, "MNG features are not allowed in a PNG datastream"); |
| png_ptr->mng_features_permitted = 0; |
| } |
| #endif |
| /* Write IHDR information. */ |
| png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height, |
| info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type, |
| info_ptr->filter_type, |
| #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
| info_ptr->interlace_type); |
| #else |
| 0); |
| #endif |
| /* The rest of these check to see if the valid field has the appropriate |
| * flag set, and if it does, writes the chunk. |
| */ |
| #ifdef PNG_WRITE_gAMA_SUPPORTED |
| if (info_ptr->valid & PNG_INFO_gAMA) |
| { |
| # 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 |
| #ifdef PNG_WRITE_sRGB_SUPPORTED |
| if (info_ptr->valid & PNG_INFO_sRGB) |
| png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent); |
| #endif |
| #ifdef PNG_WRITE_iCCP_SUPPORTED |
| if (info_ptr->valid & PNG_INFO_iCCP) |
| png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE, |
| info_ptr->iccp_profile, (int)info_ptr->iccp_proflen); |
| #endif |
| #ifdef PNG_WRITE_sBIT_SUPPORTED |
| if (info_ptr->valid & PNG_INFO_sBIT) |
| png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type); |
| #endif |
| #ifdef PNG_WRITE_cHRM_SUPPORTED |
| if (info_ptr->valid & PNG_INFO_cHRM) |
| { |
| #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"); |
| |
| #ifdef PNG_WRITE_tRNS_SUPPORTED |
| if (info_ptr->valid & PNG_INFO_tRNS) |
| { |
| #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED |
| /* Invert the alpha channel (in tRNS) */ |
| if ((png_ptr->transformations & PNG_INVERT_ALPHA) && |
| info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| { |
| int j; |
| for (j = 0; j<(int)info_ptr->num_trans; j++) |
| info_ptr->trans_alpha[j] = (png_byte)(255 - info_ptr->trans_alpha[j]); |
| } |
| #endif |
| png_write_tRNS(png_ptr, info_ptr->trans_alpha, &(info_ptr->trans_color), |
| info_ptr->num_trans, info_ptr->color_type); |
| } |
| #endif |
| #ifdef PNG_WRITE_bKGD_SUPPORTED |
| if (info_ptr->valid & PNG_INFO_bKGD) |
| png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type); |
| #endif |
| #ifdef PNG_WRITE_hIST_SUPPORTED |
| if (info_ptr->valid & PNG_INFO_hIST) |
| png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette); |
| #endif |
| #ifdef PNG_WRITE_oFFs_SUPPORTED |
| if (info_ptr->valid & PNG_INFO_oFFs) |
| png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset, |
| info_ptr->offset_unit_type); |
| #endif |
| #ifdef PNG_WRITE_pCAL_SUPPORTED |
| if (info_ptr->valid & PNG_INFO_pCAL) |
| png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0, |
| info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams, |
| info_ptr->pcal_units, info_ptr->pcal_params); |
| #endif |
| |
| #ifdef PNG_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 /* pHYs */ |
| |
| #ifdef PNG_WRITE_tIME_SUPPORTED |
| if (info_ptr->valid & PNG_INFO_tIME) |
| { |
| png_write_tIME(png_ptr, &(info_ptr->mod_time)); |
| png_ptr->mode |= PNG_WROTE_tIME; |
| } |
| #endif /* tIME */ |
| |
| #ifdef PNG_WRITE_sPLT_SUPPORTED |
| if (info_ptr->valid & PNG_INFO_sPLT) |
| for (i = 0; i < (int)info_ptr->splt_palettes_num; i++) |
| png_write_sPLT(png_ptr, info_ptr->splt_palettes + i); |
| #endif /* sPLT */ |
| |
| #ifdef PNG_WRITE_TEXT_SUPPORTED |
| /* Check to see if we need to write text chunks */ |
| for (i = 0; i < info_ptr->num_text; i++) |
| { |
| png_debug2(2, "Writing header text chunk %d, type %d", i, |
| info_ptr->text[i].compression); |
| /* An internationalized chunk? */ |
| if (info_ptr->text[i].compression > 0) |
| { |
| #ifdef PNG_WRITE_iTXt_SUPPORTED |
| /* Write international chunk */ |
| png_write_iTXt(png_ptr, |
| info_ptr->text[i].compression, |
| info_ptr->text[i].key, |
| info_ptr->text[i].lang, |
| info_ptr->text[i].lang_key, |
| info_ptr->text[i].text); |
| #else |
| png_warning(png_ptr, "Unable to write international text"); |
| #endif |
| /* Mark this chunk as written */ |
| info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; |
| } |
| /* If we want a compressed text chunk */ |
| else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt) |
| { |
| #ifdef PNG_WRITE_zTXt_SUPPORTED |
| /* Write compressed chunk */ |
| png_write_zTXt(png_ptr, info_ptr->text[i].key, |
| info_ptr->text[i].text, 0, |
| info_ptr->text[i].compression); |
| #else |
| png_warning(png_ptr, "Unable to write compressed text"); |
| #endif |
| /* Mark this chunk as written */ |
| info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR; |
| } |
| else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE) |
| { |
| #ifdef PNG_WRITE_tEXt_SUPPORTED |
| /* Write uncompressed chunk */ |
| png_write_tEXt(png_ptr, info_ptr->text[i].key, |
| info_ptr->text[i].text, |
| 0); |
| /* Mark this chunk as written */ |
| info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; |
| #else |
| /* Can't get here */ |
| png_warning(png_ptr, "Unable to write uncompressed text"); |
| #endif |
| } |
| } |
| #endif /* tEXt */ |
| |
| #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED |
| if (info_ptr->unknown_chunks_num) |
| { |
| png_unknown_chunk *up; |
| |
| png_debug(5, "writing extra chunks"); |
| |
| for (up = info_ptr->unknown_chunks; |
| up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; |
| up++) |
| { |
| int keep = png_handle_as_unknown(png_ptr, up->name); |
| if (keep != PNG_HANDLE_CHUNK_NEVER && |
| up->location && (up->location & PNG_HAVE_PLTE) && |
| !(up->location & PNG_HAVE_IDAT) && |
| !(up->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 |
| } |
| |
| /* Writes the end of the PNG file. If you don't want to write comments or |
| * time information, you can pass NULL for info. If you already wrote these |
| * in png_write_info(), do not write them again here. If you have long |
| * comments, I suggest writing them here, and compressing them. |
| */ |
| void PNGAPI |
| png_write_end(png_structp png_ptr, png_infop info_ptr) |
| { |
| png_debug(1, "in png_write_end"); |
| |
| if (png_ptr == NULL) |
| return; |
| if (!(png_ptr->mode & PNG_HAVE_IDAT)) |
| png_error(png_ptr, "No IDATs written into file"); |
| |
| /* See if user wants us to write information chunks */ |
| if (info_ptr != NULL) |
| { |
| #ifdef PNG_WRITE_TEXT_SUPPORTED |
| int i; /* local index variable */ |
| #endif |
| #ifdef PNG_WRITE_tIME_SUPPORTED |
| /* Check to see if user has supplied a time chunk */ |
| if ((info_ptr->valid & PNG_INFO_tIME) && |
| !(png_ptr->mode & PNG_WROTE_tIME)) |
| png_write_tIME(png_ptr, &(info_ptr->mod_time)); |
| #endif |
| #ifdef PNG_WRITE_TEXT_SUPPORTED |
| /* Loop through comment chunks */ |
| for (i = 0; i < info_ptr->num_text; i++) |
| { |
| png_debug2(2, "Writing trailer text chunk %d, type %d", i, |
| info_ptr->text[i].compression); |
| /* An internationalized chunk? */ |
| if (info_ptr->text[i].compression > 0) |
| { |
| #ifdef PNG_WRITE_iTXt_SUPPORTED |
| /* Write international chunk */ |
| png_write_iTXt(png_ptr, |
| info_ptr->text[i].compression, |
| info_ptr->text[i].key, |
| info_ptr->text[i].lang, |
| info_ptr->text[i].lang_key, |
| info_ptr->text[i].text); |
| #else |
| png_warning(png_ptr, "Unable to write international text"); |
| #endif |
| /* Mark this chunk as written */ |
| info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; |
| } |
| else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt) |
| { |
| #ifdef PNG_WRITE_zTXt_SUPPORTED |
| /* Write compressed chunk */ |
| png_write_zTXt(png_ptr, info_ptr->text[i].key, |
| info_ptr->text[i].text, 0, |
| info_ptr->text[i].compression); |
| #else |
| png_warning(png_ptr, "Unable to write compressed text"); |
| #endif |
| /* Mark this chunk as written */ |
| info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR; |
| } |
| else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE) |
| { |
| #ifdef PNG_WRITE_tEXt_SUPPORTED |
| /* Write uncompressed chunk */ |
| png_write_tEXt(png_ptr, info_ptr->text[i].key, |
| info_ptr->text[i].text, 0); |
| #else |
| png_warning(png_ptr, "Unable to write uncompressed text"); |
| #endif |
| |
| /* Mark this chunk as written */ |
| info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; |
| } |
| } |
| #endif |
| #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED |
| if (info_ptr->unknown_chunks_num) |
| { |
| png_unknown_chunk *up; |
| |
| png_debug(5, "writing extra chunks"); |
| |
| for (up = info_ptr->unknown_chunks; |
| up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; |
| up++) |
| { |
| int keep = png_handle_as_unknown(png_ptr, up->name); |
| if (keep != PNG_HANDLE_CHUNK_NEVER && |
| up->location && (up->location & PNG_AFTER_IDAT) && |
| ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS || |
| (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS))) |
| { |
| png_write_chunk(png_ptr, up->name, up->data, up->size); |
| } |
| } |
| } |
| #endif |
| } |
| |
| png_ptr->mode |= PNG_AFTER_IDAT; |
| |
| /* Write end of PNG file */ |
| png_write_IEND(png_ptr); |
| /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03, |
| * and restored again in libpng-1.2.30, may cause some applications that |
| * do not set png_ptr->output_flush_fn to crash. If your application |
| * experiences a problem, please try building libpng with |
| * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to |
| * png-mng-implement at lists.sf.net . |
| */ |
| #ifdef PNG_WRITE_FLUSH_SUPPORTED |
| # ifdef PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED |
| png_flush(png_ptr); |
| # endif |
| #endif |
| } |
| |
| #ifdef PNG_CONVERT_tIME_SUPPORTED |
| /* "tm" structure is not supported on WindowsCE */ |
| void PNGAPI |
| png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime) |
| { |
| png_debug(1, "in png_convert_from_struct_tm"); |
| |
| ptime->year = (png_uint_16)(1900 + ttime->tm_year); |
| ptime->month = (png_byte)(ttime->tm_mon + 1); |
| ptime->day = (png_byte)ttime->tm_mday; |
| ptime->hour = (png_byte)ttime->tm_hour; |
| ptime->minute = (png_byte)ttime->tm_min; |
| ptime->second = (png_byte)ttime->tm_sec; |
| } |
| |
| void PNGAPI |
| png_convert_from_time_t(png_timep ptime, time_t ttime) |
| { |
| struct tm *tbuf; |
| |
| png_debug(1, "in png_convert_from_time_t"); |
| |
| tbuf = gmtime(&ttime); |
| png_convert_from_struct_tm(ptime, tbuf); |
| } |
| #endif |
| |
| /* Initialize png_ptr structure, and allocate any memory needed */ |
| png_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 |
| #endif |
| |
| 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_jmpbuf(png_ptr))) /* sets longjmp to match setjmp */ |
| #endif |
| #ifdef USE_FAR_KEYWORD |
| 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); |
| |
| if (user_png_ver != NULL) |
| { |
| int i = -1; |
| int found_dots = 0; |
| |
| do |
| { |
| i++; |
| if (user_png_ver[i] != PNG_LIBPNG_VER_STRING[i]) |
| png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; |
| if (user_png_ver[i] == '.') |
| found_dots++; |
| } while (found_dots < 2 && user_png_ver[i] != 0 && |
| PNG_LIBPNG_VER_STRING[i] != 0); |
| } |
| |
| 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 */ |
| png_ptr->zbuf_size = PNG_ZBUF_SIZE; |
| if (!png_cleanup_needed) |
| { |
| png_ptr->zbuf = (png_bytep)png_malloc_warn(png_ptr, |
| png_ptr->zbuf_size); |
| if (png_ptr->zbuf == NULL) |
| png_cleanup_needed = 1; |
| } |
| if (png_cleanup_needed) |
| { |
| /* Clean up PNG structure and deallocate any memory. */ |
| png_free(png_ptr, png_ptr->zbuf); |
| png_ptr->zbuf = NULL; |
| #ifdef PNG_USER_MEM_SUPPORTED |
| png_destroy_struct_2((png_voidp)png_ptr, |
| (png_free_ptr)free_fn, (png_voidp)mem_ptr); |
| #else |
| png_destroy_struct((png_voidp)png_ptr); |
| #endif |
| return (NULL); |
| } |
| |
| png_set_write_fn(png_ptr, NULL, NULL, NULL); |
| |
| return (png_ptr); |
| } |
| |
| |
| /* Write a few rows of image data. If the image is interlaced, |
| * either you will have to write the 7 sub images, or, if you |
| * have called png_set_interlace_handling(), you will have to |
| * "write" the image seven times. |
| */ |
| void PNGAPI |
| png_write_rows(png_structp png_ptr, png_bytepp row, |
| png_uint_32 num_rows) |
| { |
| png_uint_32 i; /* row counter */ |
| png_bytepp rp; /* row pointer */ |
| |
| png_debug(1, "in png_write_rows"); |
| |
| if (png_ptr == NULL) |
| return; |
| |
| /* Loop through the rows */ |
| for (i = 0, rp = row; i < num_rows; i++, rp++) |
| { |
| png_write_row(png_ptr, *rp); |
| } |
| } |
| |
| /* Write the image. You only need to call this function once, even |
| * if you are writing an interlaced image. |
| */ |
| void PNGAPI |
| png_write_image(png_structp png_ptr, png_bytepp image) |
| { |
| png_uint_32 i; /* row index */ |
| int pass, num_pass; /* pass variables */ |
| png_bytepp rp; /* points to current row */ |
| |
| if (png_ptr == NULL) |
| return; |
| |
| png_debug(1, "in png_write_image"); |
| |
| #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
| /* Initialize interlace handling. If image is not interlaced, |
| * this will set pass to 1 |
| */ |
| num_pass = png_set_interlace_handling(png_ptr); |
| #else |
| num_pass = 1; |
| #endif |
| /* Loop through passes */ |
| for (pass = 0; pass < num_pass; pass++) |
| { |
| /* Loop through image */ |
| for (i = 0, rp = image; i < png_ptr->height; i++, rp++) |
| { |
| png_write_row(png_ptr, *rp); |
| } |
| } |
| } |
| |
| /* Called by user to write a row of image data */ |
| void PNGAPI |
| png_write_row(png_structp png_ptr, png_bytep row) |
| { |
| if (png_ptr == NULL) |
| return; |
| |
| png_debug2(1, "in png_write_row (row %lu, pass %d)", |
| (unsigned long)png_ptr->row_number, png_ptr->pass); |
| |
| /* Initialize transformations and other stuff if first time */ |
| if (png_ptr->row_number == 0 && png_ptr->pass == 0) |
| { |
| /* Make sure we wrote the header info */ |
| if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE)) |
| png_error(png_ptr, |
| "png_write_info was never called before png_write_row"); |
| |
| /* Check for transforms that have been set but were defined out */ |
| #if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED) |
| if (png_ptr->transformations & PNG_INVERT_MONO) |
| png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined"); |
| #endif |
| #if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED) |
| if (png_ptr->transformations & PNG_FILLER) |
| png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined"); |
| #endif |
| #if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \ |
| defined(PNG_READ_PACKSWAP_SUPPORTED) |
| if (png_ptr->transformations & PNG_PACKSWAP) |
| png_warning(png_ptr, |
| "PNG_WRITE_PACKSWAP_SUPPORTED is not defined"); |
| #endif |
| #if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED) |
| if (png_ptr->transformations & PNG_PACK) |
| png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined"); |
| #endif |
| #if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED) |
| if (png_ptr->transformations & PNG_SHIFT) |
| png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined"); |
| #endif |
| #if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED) |
| if (png_ptr->transformations & PNG_BGR) |
| png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined"); |
| #endif |
| #if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED) |
| if (png_ptr->transformations & PNG_SWAP_BYTES) |
| png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined"); |
| #endif |
| |
| png_write_start_row(png_ptr); |
| } |
| |
| #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
| /* If interlaced and not interested in row, return */ |
| if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) |
| { |
| switch (png_ptr->pass) |
| { |
| case 0: |
| if (png_ptr->row_number & 0x07) |
| { |
| png_write_finish_row(png_ptr); |
| return; |
| } |
| break; |
| case 1: |
| if ((png_ptr->row_number & 0x07) || png_ptr->width < 5) |
| { |
| png_write_finish_row(png_ptr); |
| return; |
| } |
| break; |
| case 2: |
| if ((png_ptr->row_number & 0x07) != 4) |
| { |
| png_write_finish_row(png_ptr); |
| return; |
| } |
| break; |
| case 3: |
| if ((png_ptr->row_number & 0x03) || png_ptr->width < 3) |
| { |
| png_write_finish_row(png_ptr); |
| return; |
| } |
| break; |
| case 4: |
| if ((png_ptr->row_number & 0x03) != 2) |
| { |
| png_write_finish_row(png_ptr); |
| return; |
| } |
| break; |
| case 5: |
| if ((png_ptr->row_number & 0x01) || png_ptr->width < 2) |
| { |
| png_write_finish_row(png_ptr); |
| return; |
| } |
| break; |
| case 6: |
| if (!(png_ptr->row_number & 0x01)) |
| { |
| png_write_finish_row(png_ptr); |
| return; |
| } |
| break; |
| } |
| } |
| #endif |
| |
| /* Set up row info for transformations */ |
| png_ptr->row_info.color_type = png_ptr->color_type; |
| png_ptr->row_info.width = png_ptr->usr_width; |
| png_ptr->row_info.channels = png_ptr->usr_channels; |
| png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth; |
| png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth * |
| png_ptr->row_info.channels); |
| |
| png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, |
| png_ptr->row_info.width); |
| |
| png_debug1(3, "row_info->color_type = %d", png_ptr->row_info.color_type); |
| png_debug1(3, "row_info->width = %lu", |
| (unsigned long)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(png_ptr->row_buf + 1, row, png_ptr->row_info.rowbytes); |
| |
| #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
| /* Handle interlacing */ |
| if (png_ptr->interlaced && png_ptr->pass < 6 && |
| (png_ptr->transformations & PNG_INTERLACE)) |
| { |
| png_do_write_interlace(&(png_ptr->row_info), |
| png_ptr->row_buf + 1, png_ptr->pass); |
| /* This should always get caught above, but still ... */ |
| if (!(png_ptr->row_info.width)) |
| { |
| png_write_finish_row(png_ptr); |
| return; |
| } |
| } |
| #endif |
| |
| /* Handle other transformations */ |
| if (png_ptr->transformations) |
| png_do_write_transformations(png_ptr); |
| |
| #ifdef PNG_MNG_FEATURES_SUPPORTED |
| /* Write filter_method 64 (intrapixel differencing) only if |
| * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and |
| * 2. Libpng did not write a PNG signature (this filter_method is only |
| * used in PNG datastreams that are embedded in MNG datastreams) and |
| * 3. The application called png_permit_mng_features with a mask that |
| * included PNG_FLAG_MNG_FILTER_64 and |
| * 4. The filter_method is 64 and |
| * 5. The color_type is RGB or RGBA |
| */ |
| if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && |
| (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) |
| { |
| /* Intrapixel differencing */ |
| png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1); |
| } |
| #endif |
| |
| /* Find a filter if necessary, filter the row and write it out. */ |
| png_write_find_filter(png_ptr, &(png_ptr->row_info)); |
| |
| if (png_ptr->write_row_fn != NULL) |
| (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass); |
| } |
| |
| #ifdef PNG_WRITE_FLUSH_SUPPORTED |
| /* Set the automatic flush interval or 0 to turn flushing off */ |
| void PNGAPI |
| png_set_flush(png_structp png_ptr, int nrows) |
| { |
| png_debug(1, "in png_set_flush"); |
| |
| if (png_ptr == NULL) |
| return; |
| png_ptr->flush_dist = (nrows < 0 ? 0 : nrows); |
| } |
| |
| /* Flush the current output buffers now */ |
| void PNGAPI |
| png_write_flush(png_structp png_ptr) |
| { |
| int wrote_IDAT; |
| |
| png_debug(1, "in png_write_flush"); |
| |
| if (png_ptr == NULL) |
| return; |
| /* We have already written out all of the data */ |
| if (png_ptr->row_number >= png_ptr->num_rows) |
| return; |
| |
| do |
| { |
| int ret; |
| |
| /* Compress the data */ |
| ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH); |
| wrote_IDAT = 0; |
| |
| /* Check for compression errors */ |
| if (ret != Z_OK) |
| { |
| if (png_ptr->zstream.msg != NULL) |
| png_error(png_ptr, png_ptr->zstream.msg); |
| else |
| png_error(png_ptr, "zlib error"); |
| } |
| |
| if (!(png_ptr->zstream.avail_out)) |
| { |
| /* Write the IDAT and reset the zlib output buffer */ |
| png_write_IDAT(png_ptr, png_ptr->zbuf, |
| png_ptr->zbuf_size); |
| png_ptr->zstream.next_out = png_ptr->zbuf; |
| png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| wrote_IDAT = 1; |
| } |
| } while(wrote_IDAT == 1); |
| |
| /* If there is any data left to be output, write it into a new IDAT */ |
| if (png_ptr->zbuf_size != png_ptr->zstream.avail_out) |
| { |
| /* Write the IDAT and reset the zlib output buffer */ |
| png_write_IDAT(png_ptr, png_ptr->zbuf, |
| png_ptr->zbuf_size - png_ptr->zstream.avail_out); |
| png_ptr->zstream.next_out = png_ptr->zbuf; |
| png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| } |
| png_ptr->flush_rows = 0; |
| png_flush(png_ptr); |
| } |
| #endif /* PNG_WRITE_FLUSH_SUPPORTED */ |
| |
| /* Free all memory used by the write */ |
| void PNGAPI |
| png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr) |
| { |
| png_structp png_ptr = NULL; |
| png_infop info_ptr = NULL; |
| #ifdef PNG_USER_MEM_SUPPORTED |
| png_free_ptr free_fn = NULL; |
| png_voidp mem_ptr = NULL; |
| #endif |
| |
| png_debug(1, "in png_destroy_write_struct"); |
| |
| if (png_ptr_ptr != NULL) |
| { |
| png_ptr = *png_ptr_ptr; |
| #ifdef PNG_USER_MEM_SUPPORTED |
| free_fn = png_ptr->free_fn; |
| mem_ptr = png_ptr->mem_ptr; |
| #endif |
| } |
| |
| #ifdef PNG_USER_MEM_SUPPORTED |
| if (png_ptr != NULL) |
| { |
| free_fn = png_ptr->free_fn; |
| mem_ptr = png_ptr->mem_ptr; |
| } |
| #endif |
| |
| if (info_ptr_ptr != NULL) |
| info_ptr = *info_ptr_ptr; |
| |
| if (info_ptr != NULL) |
| { |
| if (png_ptr != NULL) |
| { |
| png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); |
| |
| #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
| if (png_ptr->num_chunk_list) |
| { |
| png_free(png_ptr, png_ptr->chunk_list); |
| png_ptr->num_chunk_list = 0; |
| } |
| #endif |
| } |
| |
| #ifdef PNG_USER_MEM_SUPPORTED |
| png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn, |
| (png_voidp)mem_ptr); |
| #else |
| png_destroy_struct((png_voidp)info_ptr); |
| #endif |
| *info_ptr_ptr = NULL; |
| } |
| |
| if (png_ptr != NULL) |
| { |
| png_write_destroy(png_ptr); |
| #ifdef PNG_USER_MEM_SUPPORTED |
| png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn, |
| (png_voidp)mem_ptr); |
| #else |
| png_destroy_struct((png_voidp)png_ptr); |
| #endif |
| *png_ptr_ptr = NULL; |
| } |
| } |
| |
| |
| /* Free any memory used in png_ptr struct (old method) */ |
| void /* PRIVATE */ |
| png_write_destroy(png_structp png_ptr) |
| { |
| #ifdef PNG_SETJMP_SUPPORTED |
| jmp_buf tmp_jmp; /* Save jump buffer */ |
| #endif |
| png_error_ptr error_fn; |
| png_error_ptr warning_fn; |
| png_voidp error_ptr; |
| #ifdef PNG_USER_MEM_SUPPORTED |
| png_free_ptr free_fn; |
| #endif |
| |
| png_debug(1, "in png_write_destroy"); |
| |
| /* Free any memory zlib uses */ |
| deflateEnd(&png_ptr->zstream); |
| |
| /* Free our memory. png_free checks NULL for us. */ |
| png_free(png_ptr, png_ptr->zbuf); |
| png_free(png_ptr, png_ptr->row_buf); |
| #ifdef PNG_WRITE_FILTER_SUPPORTED |
| png_free(png_ptr, png_ptr->prev_row); |
| png_free(png_ptr, png_ptr->sub_row); |
| png_free(png_ptr, png_ptr->up_row); |
| png_free(png_ptr, png_ptr->avg_row); |
| png_free(png_ptr, png_ptr->paeth_row); |
| #endif |
| |
| #ifdef PNG_TIME_RFC1123_SUPPORTED |
| png_free(png_ptr, png_ptr->time_buffer); |
| #endif |
| |
| #ifdef PNG_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_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)) |
| { |
| case PNG_FILTER_VALUE_NONE: |
| png_ptr->do_filter = PNG_FILTER_NONE; break; |
| #ifdef PNG_WRITE_FILTER_SUPPORTED |
| case 5: |
| case 6: |
| case 7: png_warning(png_ptr, "Unknown row filter for method 0"); |
| 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; |
| #else |
| default: png_warning(png_ptr, "Unknown row filter for method 0"); |
| break; |
| #endif /* PNG_WRITE_FILTER_SUPPORTED */ |
| } |
| |
| /* If we have allocated the row_buf, this means we have already started |
| * with the image and we should have allocated all of the filter buffers |
| * that have been selected. If prev_row isn't already allocated, then |
| * it is too late to start using the filters that need it, since we |
| * will be missing the data in the previous row. If an application |
| * wants to start and stop using particular filters during compression, |
| * it should start out with all of the filters, and then add and |
| * remove them after the start of compression. |
| */ |
| if (png_ptr->row_buf != NULL) |
| { |
| #ifdef PNG_WRITE_FILTER_SUPPORTED |
| if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL) |
| { |
| png_ptr->sub_row = (png_bytep)png_malloc(png_ptr, |
| (png_ptr->rowbytes + 1)); |
| png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB; |
| } |
| |
| if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL) |
| { |
| if (png_ptr->prev_row == NULL) |
| { |
| png_warning(png_ptr, "Can't add Up filter after starting"); |
| png_ptr->do_filter &= ~PNG_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) |
| #endif /* PNG_WRITE_FILTER_SUPPORTED */ |
| png_ptr->do_filter = PNG_FILTER_NONE; |
| } |
| } |
| else |
| png_error(png_ptr, "Unknown custom filter method"); |
| } |
| |
| /* This allows us to influence the way in which libpng chooses the "best" |
| * filter for the current scanline. While the "minimum-sum-of-absolute- |
| * differences metric is relatively fast and effective, there is some |
| * question as to whether it can be improved upon by trying to keep the |
| * filtered data going to zlib more consistent, hopefully resulting in |
| * better compression. |
| */ |
| #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* GRR 970116 */ |
| #ifdef PNG_FLOATING_POINT_SUPPORTED |
| void PNGAPI |
| png_set_filter_heuristics(png_structp png_ptr, int heuristic_method, |
| int num_weights, png_doublep filter_weights, |
| png_doublep filter_costs) |
| { |
| PNG_UNUSED(png_ptr) |
| PNG_UNUSED(heuristic_method) |
| PNG_UNUSED(num_weights) |
| PNG_UNUSED(filter_weights) |
| PNG_UNUSED(filter_costs) |
| } |
| #endif |
| #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ |
| |
| void PNGAPI |
| png_set_compression_level(png_structp png_ptr, int level) |
| { |
| png_debug(1, "in png_set_compression_level"); |
| |
| if (png_ptr == NULL) |
| return; |
| png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL; |
| png_ptr->zlib_level = level; |
| } |
| |
| void PNGAPI |
| png_set_compression_mem_level(png_structp png_ptr, int mem_level) |
| { |
| png_debug(1, "in png_set_compression_mem_level"); |
| |
| if (png_ptr == NULL) |
| return; |
| png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL; |
| png_ptr->zlib_mem_level = mem_level; |
| } |
| |
| void PNGAPI |
| png_set_compression_strategy(png_structp png_ptr, int strategy) |
| { |
| png_debug(1, "in png_set_compression_strategy"); |
| |
| if (png_ptr == NULL) |
| return; |
| png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY; |
| png_ptr->zlib_strategy = strategy; |
| } |
| |
| void PNGAPI |
| png_set_compression_window_bits(png_structp png_ptr, int window_bits) |
| { |
| if (png_ptr == NULL) |
| return; |
| if (window_bits > 15) |
| png_warning(png_ptr, "Only compression windows <= 32k supported by PNG"); |
| else if (window_bits < 8) |
| png_warning(png_ptr, "Only compression windows >= 256 supported by PNG"); |
| #ifndef WBITS_8_OK |
| /* Avoid libpng bug with 256-byte windows */ |
| if (window_bits == 8) |
| { |
| png_warning(png_ptr, "Compression window is being reset to 512"); |
| window_bits = 9; |
| } |
| #endif |
| png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS; |
| png_ptr->zlib_window_bits = window_bits; |
| } |
| |
| void PNGAPI |
| png_set_compression_method(png_structp png_ptr, int method) |
| { |
| png_debug(1, "in png_set_compression_method"); |
| |
| if (png_ptr == NULL) |
| return; |
| if (method != 8) |
| png_warning(png_ptr, "Only compression method 8 is supported by PNG"); |
| png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD; |
| png_ptr->zlib_method = method; |
| } |
| |
| void PNGAPI |
| png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn) |
| { |
| if (png_ptr == NULL) |
| return; |
| png_ptr->write_row_fn = write_row_fn; |
| } |
| |
| #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED |
| void PNGAPI |
| png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr |
| write_user_transform_fn) |
| { |
| png_debug(1, "in png_set_write_user_transform_fn"); |
| |
| if (png_ptr == NULL) |
| return; |
| png_ptr->transformations |= PNG_USER_TRANSFORM; |
| png_ptr->write_user_transform_fn = write_user_transform_fn; |
| } |
| #endif |
| |
| |
| #ifdef PNG_INFO_IMAGE_SUPPORTED |
| void PNGAPI |
| png_write_png(png_structp png_ptr, png_infop info_ptr, |
| int transforms, voidp params) |
| { |
| if (png_ptr == NULL || info_ptr == NULL) |
| return; |
| |
| /* Write the file header information. */ |
| png_write_info(png_ptr, info_ptr); |
| |
| /* ------ these transformations don't touch the info structure ------- */ |
| |
| #ifdef PNG_WRITE_INVERT_SUPPORTED |
| /* Invert monochrome pixels */ |
| if (transforms & PNG_TRANSFORM_INVERT_MONO) |
| png_set_invert_mono(png_ptr); |
| #endif |
| |
| #ifdef PNG_WRITE_SHIFT_SUPPORTED |
| /* Shift the pixels up to a legal bit depth and fill in |
| * as appropriate to correctly scale the image. |
| */ |
| if ((transforms & PNG_TRANSFORM_SHIFT) |
| && (info_ptr->valid & PNG_INFO_sBIT)) |
| png_set_shift(png_ptr, &info_ptr->sig_bit); |
| #endif |
| |
| #ifdef PNG_WRITE_PACK_SUPPORTED |
| /* Pack pixels into bytes */ |
| if (transforms & PNG_TRANSFORM_PACKING) |
| png_set_packing(png_ptr); |
| #endif |
| |
| #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED |
| /* Swap location of alpha bytes from ARGB to RGBA */ |
| if (transforms & PNG_TRANSFORM_SWAP_ALPHA) |
| png_set_swap_alpha(png_ptr); |
| #endif |
| |
| #ifdef PNG_WRITE_FILLER_SUPPORTED |
| /* Pack XRGB/RGBX/ARGB/RGBA into RGB (4 channels -> 3 channels) */ |
| if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER) |
| png_set_filler(png_ptr, 0, PNG_FILLER_AFTER); |
| else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE) |
| png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE); |
| #endif |
| |
| #ifdef PNG_WRITE_BGR_SUPPORTED |
| /* Flip BGR pixels to RGB */ |
| if (transforms & PNG_TRANSFORM_BGR) |
| png_set_bgr(png_ptr); |
| #endif |
| |
| #ifdef PNG_WRITE_SWAP_SUPPORTED |
| /* Swap bytes of 16-bit files to most significant byte first */ |
| if (transforms & PNG_TRANSFORM_SWAP_ENDIAN) |
| png_set_swap(png_ptr); |
| #endif |
| |
| #ifdef PNG_WRITE_PACKSWAP_SUPPORTED |
| /* Swap bits of 1, 2, 4 bit packed pixel formats */ |
| if (transforms & PNG_TRANSFORM_PACKSWAP) |
| png_set_packswap(png_ptr); |
| #endif |
| |
| #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED |
| /* Invert the alpha channel from opacity to transparency */ |
| if (transforms & PNG_TRANSFORM_INVERT_ALPHA) |
| png_set_invert_alpha(png_ptr); |
| #endif |
| |
| /* ----------------------- end of transformations ------------------- */ |
| |
| /* Write the bits */ |
| if (info_ptr->valid & PNG_INFO_IDAT) |
| png_write_image(png_ptr, info_ptr->row_pointers); |
| |
| /* It is REQUIRED to call this to finish writing the rest of the file */ |
| png_write_end(png_ptr, info_ptr); |
| |
| PNG_UNUSED(transforms) /* Quiet compiler warnings */ |
| PNG_UNUSED(params) |
| } |
| #endif |
| #endif /* PNG_WRITE_SUPPORTED */ |