--- a/jdk/src/java.desktop/share/native/libsplashscreen/libpng/pngwrite.c Fri Jan 27 20:33:34 2017 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,2411 +0,0 @@
-/*
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation. Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-
-/* pngwrite.c - general routines to write a PNG file
- *
- * This file is available under and governed by the GNU General Public
- * License version 2 only, as published by the Free Software Foundation.
- * However, the following notice accompanied the original version of this
- * file and, per its terms, should not be removed:
- *
- * Last changed in libpng 1.6.19 [November 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
- */
-
-#include "pngpriv.h"
-#ifdef PNG_SIMPLIFIED_WRITE_STDIO_SUPPORTED
-# include <errno.h>
-#endif /* SIMPLIFIED_WRITE_STDIO */
-
-#ifdef PNG_WRITE_SUPPORTED
-
-#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
-/* Write out all the unknown chunks for the current given location */
-static void
-write_unknown_chunks(png_structrp png_ptr, png_const_inforp info_ptr,
- unsigned int where)
-{
- if (info_ptr->unknown_chunks_num != 0)
- {
- png_const_unknown_chunkp up;
-
- png_debug(5, "writing extra chunks");
-
- for (up = info_ptr->unknown_chunks;
- up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
- ++up)
- if ((up->location & where) != 0)
- {
- /* If per-chunk unknown chunk handling is enabled use it, otherwise
- * just write the chunks the application has set.
- */
-#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
- int keep = png_handle_as_unknown(png_ptr, up->name);
-
- /* NOTE: this code is radically different from the read side in the
- * matter of handling an ancillary unknown chunk. In the read side
- * the default behavior is to discard it, in the code below the default
- * behavior is to write it. Critical chunks are, however, only
- * written if explicitly listed or if the default is set to write all
- * unknown chunks.
- *
- * The default handling is also slightly weird - it is not possible to
- * stop the writing of all unsafe-to-copy chunks!
- *
- * TODO: REVIEW: this would seem to be a bug.
- */
- if (keep != PNG_HANDLE_CHUNK_NEVER &&
- ((up->name[3] & 0x20) /* safe-to-copy overrides everything */ ||
- keep == PNG_HANDLE_CHUNK_ALWAYS ||
- (keep == PNG_HANDLE_CHUNK_AS_DEFAULT &&
- png_ptr->unknown_default == PNG_HANDLE_CHUNK_ALWAYS)))
-#endif
- {
- /* TODO: review, what is wrong with a zero length unknown chunk? */
- 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 /* WRITE_UNKNOWN_CHUNKS */
-
-/* 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_structrp png_ptr, png_const_inforp 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) == 0)
- {
- /* Write PNG signature */
- png_write_sig(png_ptr);
-
-#ifdef PNG_MNG_FEATURES_SUPPORTED
- if ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) != 0 && \
- png_ptr->mng_features_permitted != 0)
- {
- 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.
- *
- * 1.6.0: COLORSPACE support controls the writing of these chunks too, and
- * the chunks will be written if the WRITE routine is there and
- * information * is available in the COLORSPACE. (See
- * png_colorspace_sync_info in png.c for where the valid flags get set.)
- *
- * Under certain circumstances the colorspace can be invalidated without
- * syncing the info_struct 'valid' flags; this happens if libpng detects
- * an error and calls png_error while the color space is being set, yet
- * the application continues writing the PNG. So check the 'invalid'
- * flag here too.
- */
-#ifdef PNG_GAMMA_SUPPORTED
-# ifdef PNG_WRITE_gAMA_SUPPORTED
- if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
- (info_ptr->colorspace.flags & PNG_COLORSPACE_FROM_gAMA) != 0 &&
- (info_ptr->valid & PNG_INFO_gAMA) != 0)
- png_write_gAMA_fixed(png_ptr, info_ptr->colorspace.gamma);
-# endif
-#endif
-
-#ifdef PNG_COLORSPACE_SUPPORTED
- /* Write only one of sRGB or an ICC profile. If a profile was supplied
- * and it matches one of the known sRGB ones issue a warning.
- */
-# ifdef PNG_WRITE_iCCP_SUPPORTED
- if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
- (info_ptr->valid & PNG_INFO_iCCP) != 0)
- {
-# ifdef PNG_WRITE_sRGB_SUPPORTED
- if ((info_ptr->valid & PNG_INFO_sRGB) != 0)
- png_app_warning(png_ptr,
- "profile matches sRGB but writing iCCP instead");
-# endif
-
- png_write_iCCP(png_ptr, info_ptr->iccp_name,
- info_ptr->iccp_profile);
- }
-# ifdef PNG_WRITE_sRGB_SUPPORTED
- else
-# endif
-# endif
-
-# ifdef PNG_WRITE_sRGB_SUPPORTED
- if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
- (info_ptr->valid & PNG_INFO_sRGB) != 0)
- png_write_sRGB(png_ptr, info_ptr->colorspace.rendering_intent);
-# endif /* WRITE_sRGB */
-#endif /* COLORSPACE */
-
-#ifdef PNG_WRITE_sBIT_SUPPORTED
- if ((info_ptr->valid & PNG_INFO_sBIT) != 0)
- png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
-#endif
-
-#ifdef PNG_COLORSPACE_SUPPORTED
-# ifdef PNG_WRITE_cHRM_SUPPORTED
- if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
- (info_ptr->colorspace.flags & PNG_COLORSPACE_FROM_cHRM) != 0 &&
- (info_ptr->valid & PNG_INFO_cHRM) != 0)
- png_write_cHRM_fixed(png_ptr, &info_ptr->colorspace.end_points_xy);
-# endif
-#endif
-
-#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
- write_unknown_chunks(png_ptr, info_ptr, PNG_HAVE_IHDR);
-#endif
-
- png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
- }
-}
-
-void PNGAPI
-png_write_info(png_structrp png_ptr, png_const_inforp 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) != 0)
- 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) !=0)
- {
-#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
- /* Invert the alpha channel (in tRNS) */
- if ((png_ptr->transformations & PNG_INVERT_ALPHA) != 0 &&
- info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
- {
- int j, jend;
-
- jend = info_ptr->num_trans;
- if (jend > PNG_MAX_PALETTE_LENGTH)
- jend = PNG_MAX_PALETTE_LENGTH;
-
- for (j = 0; j<jend; ++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) != 0)
- 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) != 0)
- 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) != 0)
- 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) != 0)
- png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
- info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
- info_ptr->pcal_units, info_ptr->pcal_params);
-#endif
-
-#ifdef PNG_WRITE_sCAL_SUPPORTED
- if ((info_ptr->valid & PNG_INFO_sCAL) != 0)
- png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
- info_ptr->scal_s_width, info_ptr->scal_s_height);
-#endif /* sCAL */
-
-#ifdef PNG_WRITE_pHYs_SUPPORTED
- if ((info_ptr->valid & PNG_INFO_pHYs) != 0)
- 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) != 0)
- {
- 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) != 0)
- 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);
- /* Mark this chunk as written */
- if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
- info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
- else
- info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
-#else
- png_warning(png_ptr, "Unable to write international text");
-#endif
- }
-
- /* 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, info_ptr->text[i].compression);
- /* Mark this chunk as written */
- info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
-#else
- png_warning(png_ptr, "Unable to write compressed text");
-#endif
- }
-
- 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
- write_unknown_chunks(png_ptr, info_ptr, PNG_HAVE_PLTE);
-#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_structrp png_ptr, png_inforp info_ptr)
-{
- png_debug(1, "in png_write_end");
-
- if (png_ptr == NULL)
- return;
-
- if ((png_ptr->mode & PNG_HAVE_IDAT) == 0)
- png_error(png_ptr, "No IDATs written into file");
-
-#ifdef PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED
- if (png_ptr->num_palette_max > png_ptr->num_palette)
- png_benign_error(png_ptr, "Wrote palette index exceeding num_palette");
-#endif
-
- /* 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) != 0 &&
- (png_ptr->mode & PNG_WROTE_tIME) == 0)
- 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);
- /* Mark this chunk as written */
- if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
- info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
- else
- info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
-#else
- png_warning(png_ptr, "Unable to write international text");
-#endif
- }
-
- 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].compression);
- /* Mark this chunk as written */
- info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
-#else
- png_warning(png_ptr, "Unable to write compressed text");
-#endif
- }
-
- 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
- png_warning(png_ptr, "Unable to write uncompressed text");
-#endif
- }
- }
-#endif
-#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
- write_unknown_chunks(png_ptr, info_ptr, PNG_AFTER_IDAT);
-#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
-void PNGAPI
-png_convert_from_struct_tm(png_timep ptime, PNG_CONST struct tm * ttime)
-{
- png_debug(1, "in png_convert_from_struct_tm");
-
- ptime->year = (png_uint_16)(1900 + ttime->tm_year);
- ptime->month = (png_byte)(ttime->tm_mon + 1);
- ptime->day = (png_byte)ttime->tm_mday;
- ptime->hour = (png_byte)ttime->tm_hour;
- ptime->minute = (png_byte)ttime->tm_min;
- ptime->second = (png_byte)ttime->tm_sec;
-}
-
-void PNGAPI
-png_convert_from_time_t(png_timep ptime, time_t ttime)
-{
- struct tm *tbuf;
-
- png_debug(1, "in png_convert_from_time_t");
-
- tbuf = gmtime(&ttime);
- png_convert_from_struct_tm(ptime, tbuf);
-}
-#endif
-
-/* Initialize png_ptr structure, and allocate any memory needed */
-PNG_FUNCTION(png_structp,PNGAPI
-png_create_write_struct,(png_const_charp user_png_ver, png_voidp error_ptr,
- png_error_ptr error_fn, png_error_ptr warn_fn),PNG_ALLOCATED)
-{
-#ifndef PNG_USER_MEM_SUPPORTED
- png_structrp png_ptr = png_create_png_struct(user_png_ver, error_ptr,
- error_fn, warn_fn, NULL, NULL, NULL);
-#else
- 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_FUNCTION(png_structp,PNGAPI
-png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
- png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
- png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED)
-{
- png_structrp png_ptr = png_create_png_struct(user_png_ver, error_ptr,
- error_fn, warn_fn, mem_ptr, malloc_fn, free_fn);
-#endif /* USER_MEM */
- if (png_ptr != NULL)
- {
- /* Set the zlib control values to defaults; they can be overridden by the
- * application after the struct has been created.
- */
- png_ptr->zbuffer_size = PNG_ZBUF_SIZE;
-
- /* The 'zlib_strategy' setting is irrelevant because png_default_claim in
- * pngwutil.c defaults it according to whether or not filters will be
- * used, and ignores this setting.
- */
- png_ptr->zlib_strategy = PNG_Z_DEFAULT_STRATEGY;
- png_ptr->zlib_level = PNG_Z_DEFAULT_COMPRESSION;
- png_ptr->zlib_mem_level = 8;
- png_ptr->zlib_window_bits = 15;
- png_ptr->zlib_method = 8;
-
-#ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED
- png_ptr->zlib_text_strategy = PNG_TEXT_Z_DEFAULT_STRATEGY;
- png_ptr->zlib_text_level = PNG_TEXT_Z_DEFAULT_COMPRESSION;
- png_ptr->zlib_text_mem_level = 8;
- png_ptr->zlib_text_window_bits = 15;
- png_ptr->zlib_text_method = 8;
-#endif /* WRITE_COMPRESSED_TEXT */
-
- /* This is a highly dubious configuration option; by default it is off,
- * but it may be appropriate for private builds that are testing
- * extensions not conformant to the current specification, or of
- * applications that must not fail to write at all costs!
- */
-#ifdef PNG_BENIGN_WRITE_ERRORS_SUPPORTED
- /* In stable builds only warn if an application error can be completely
- * handled.
- */
- png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN;
-#endif
-
- /* App warnings are warnings in release (or release candidate) builds but
- * are errors during development.
- */
-#if PNG_RELEASE_BUILD
- png_ptr->flags |= PNG_FLAG_APP_WARNINGS_WARN;
-#endif
-
- /* TODO: delay this, it can be done in png_init_io() (if the app doesn't
- * do it itself) avoiding setting the default function if it is not
- * required.
- */
- 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_structrp 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_structrp 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);
- }
- }
-}
-
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-/* Performs intrapixel differencing */
-static void
-png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
-{
- png_debug(1, "in png_do_write_intrapixel");
-
- if ((row_info->color_type & PNG_COLOR_MASK_COLOR) != 0)
- {
- int bytes_per_pixel;
- png_uint_32 row_width = row_info->width;
- if (row_info->bit_depth == 8)
- {
- png_bytep rp;
- png_uint_32 i;
-
- if (row_info->color_type == PNG_COLOR_TYPE_RGB)
- bytes_per_pixel = 3;
-
- else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
- bytes_per_pixel = 4;
-
- else
- return;
-
- for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
- {
- *(rp) = (png_byte)(*rp - *(rp + 1));
- *(rp + 2) = (png_byte)(*(rp + 2) - *(rp + 1));
- }
- }
-
-#ifdef PNG_WRITE_16BIT_SUPPORTED
- else if (row_info->bit_depth == 16)
- {
- png_bytep rp;
- png_uint_32 i;
-
- if (row_info->color_type == PNG_COLOR_TYPE_RGB)
- bytes_per_pixel = 6;
-
- else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
- bytes_per_pixel = 8;
-
- else
- return;
-
- for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
- {
- png_uint_32 s0 = (*(rp ) << 8) | *(rp + 1);
- png_uint_32 s1 = (*(rp + 2) << 8) | *(rp + 3);
- png_uint_32 s2 = (*(rp + 4) << 8) | *(rp + 5);
- png_uint_32 red = (png_uint_32)((s0 - s1) & 0xffffL);
- png_uint_32 blue = (png_uint_32)((s2 - s1) & 0xffffL);
- *(rp ) = (png_byte)(red >> 8);
- *(rp + 1) = (png_byte)red;
- *(rp + 4) = (png_byte)(blue >> 8);
- *(rp + 5) = (png_byte)blue;
- }
- }
-#endif /* WRITE_16BIT */
- }
-}
-#endif /* MNG_FEATURES */
-
-/* Called by user to write a row of image data */
-void PNGAPI
-png_write_row(png_structrp png_ptr, png_const_bytep row)
-{
- /* 1.5.6: moved from png_struct to be a local structure: */
- png_row_info row_info;
-
- if (png_ptr == NULL)
- return;
-
- png_debug2(1, "in png_write_row (row %u, pass %d)",
- png_ptr->row_number, png_ptr->pass);
-
- /* Initialize transformations and other stuff if first time */
- if (png_ptr->row_number == 0 && png_ptr->pass == 0)
- {
- /* Make sure we wrote the header info */
- if ((png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE) == 0)
- 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) != 0)
- 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) != 0)
- 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) != 0)
- 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) != 0)
- 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) != 0)
- 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) != 0)
- 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) != 0)
- 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 != 0 &&
- (png_ptr->transformations & PNG_INTERLACE) != 0)
- {
- switch (png_ptr->pass)
- {
- case 0:
- if ((png_ptr->row_number & 0x07) != 0)
- {
- png_write_finish_row(png_ptr);
- return;
- }
- break;
-
- case 1:
- if ((png_ptr->row_number & 0x07) != 0 || 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) != 0 || 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) != 0 || png_ptr->width < 2)
- {
- png_write_finish_row(png_ptr);
- return;
- }
- break;
-
- case 6:
- if ((png_ptr->row_number & 0x01) == 0)
- {
- png_write_finish_row(png_ptr);
- return;
- }
- break;
-
- default: /* error: ignore it */
- break;
- }
- }
-#endif
-
- /* Set up row info for transformations */
- row_info.color_type = png_ptr->color_type;
- row_info.width = png_ptr->usr_width;
- row_info.channels = png_ptr->usr_channels;
- row_info.bit_depth = png_ptr->usr_bit_depth;
- row_info.pixel_depth = (png_byte)(row_info.bit_depth * row_info.channels);
- row_info.rowbytes = PNG_ROWBYTES(row_info.pixel_depth, row_info.width);
-
- png_debug1(3, "row_info->color_type = %d", row_info.color_type);
- png_debug1(3, "row_info->width = %u", row_info.width);
- png_debug1(3, "row_info->channels = %d", row_info.channels);
- png_debug1(3, "row_info->bit_depth = %d", row_info.bit_depth);
- png_debug1(3, "row_info->pixel_depth = %d", row_info.pixel_depth);
- png_debug1(3, "row_info->rowbytes = %lu", (unsigned long)row_info.rowbytes);
-
- /* Copy user's row into buffer, leaving room for filter byte. */
- memcpy(png_ptr->row_buf + 1, row, row_info.rowbytes);
-
-#ifdef PNG_WRITE_INTERLACING_SUPPORTED
- /* Handle interlacing */
- if (png_ptr->interlaced && png_ptr->pass < 6 &&
- (png_ptr->transformations & PNG_INTERLACE) != 0)
- {
- png_do_write_interlace(&row_info, png_ptr->row_buf + 1, png_ptr->pass);
- /* This should always get caught above, but still ... */
- if (row_info.width == 0)
- {
- png_write_finish_row(png_ptr);
- return;
- }
- }
-#endif
-
-#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
- /* Handle other transformations */
- if (png_ptr->transformations != 0)
- png_do_write_transformations(png_ptr, &row_info);
-#endif
-
- /* At this point the row_info pixel depth must match the 'transformed' depth,
- * which is also the output depth.
- */
- if (row_info.pixel_depth != png_ptr->pixel_depth ||
- row_info.pixel_depth != png_ptr->transformed_pixel_depth)
- png_error(png_ptr, "internal write transform logic error");
-
-#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) != 0 &&
- (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
- {
- /* Intrapixel differencing */
- png_do_write_intrapixel(&row_info, png_ptr->row_buf + 1);
- }
-#endif
-
-/* Added at libpng-1.5.10 */
-#ifdef PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED
- /* Check for out-of-range palette index */
- if (row_info.color_type == PNG_COLOR_TYPE_PALETTE &&
- png_ptr->num_palette_max >= 0)
- png_do_check_palette_indexes(png_ptr, &row_info);
-#endif
-
- /* Find a filter if necessary, filter the row and write it out. */
- png_write_find_filter(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_structrp 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_structrp png_ptr)
-{
- 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;
-
- png_compress_IDAT(png_ptr, NULL, 0, Z_SYNC_FLUSH);
- png_ptr->flush_rows = 0;
- png_flush(png_ptr);
-}
-#endif /* WRITE_FLUSH */
-
-/* Free any memory used in png_ptr struct without freeing the struct itself. */
-static void
-png_write_destroy(png_structrp png_ptr)
-{
- png_debug(1, "in png_write_destroy");
-
- /* Free any memory zlib uses */
- if ((png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) != 0)
- deflateEnd(&png_ptr->zstream);
-
- /* Free our memory. png_free checks NULL for us. */
- png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
- png_free(png_ptr, png_ptr->row_buf);
- png_ptr->row_buf = NULL;
-#ifdef PNG_WRITE_FILTER_SUPPORTED
- png_free(png_ptr, png_ptr->prev_row);
- png_free(png_ptr, png_ptr->try_row);
- png_free(png_ptr, png_ptr->tst_row);
- png_ptr->prev_row = NULL;
- png_ptr->try_row = NULL;
- png_ptr->tst_row = NULL;
-#endif
-
-#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
- png_free(png_ptr, png_ptr->chunk_list);
- png_ptr->chunk_list = NULL;
-#endif
-
- /* The error handling and memory handling information is left intact at this
- * point: the jmp_buf may still have to be freed. See png_destroy_png_struct
- * for how this happens.
- */
-}
-
-/* Free all memory used by the write.
- * In libpng 1.6.0 this API changed quietly to no longer accept a NULL value for
- * *png_ptr_ptr. Prior to 1.6.0 it would accept such a value and it would free
- * the passed in info_structs but it would quietly fail to free any of the data
- * inside them. In 1.6.0 it quietly does nothing (it has to be quiet because it
- * has no png_ptr.)
- */
-void PNGAPI
-png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
-{
- png_debug(1, "in png_destroy_write_struct");
-
- if (png_ptr_ptr != NULL)
- {
- png_structrp png_ptr = *png_ptr_ptr;
-
- if (png_ptr != NULL) /* added in libpng 1.6.0 */
- {
- png_destroy_info_struct(png_ptr, info_ptr_ptr);
-
- *png_ptr_ptr = NULL;
- png_write_destroy(png_ptr);
- png_destroy_png_struct(png_ptr);
- }
- }
-}
-
-/* Allow the application to select one or more row filters to use. */
-void PNGAPI
-png_set_filter(png_structrp 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) != 0 &&
- (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_app_error(png_ptr, "Unknown row filter for method 0");
- /* FALL THROUGH */
-#endif /* WRITE_FILTER */
- 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_app_error(png_ptr, "Unknown row filter for method 0");
-#endif /* WRITE_FILTER */
- }
-
-#ifdef 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 remove them
- * or add them back after the start of compression.
- *
- * NOTE: this is a nasty constraint on the code, because it means that the
- * prev_row buffer must be maintained even if there are currently no
- * 'prev_row' requiring filters active.
- */
- if (png_ptr->row_buf != NULL)
- {
- int num_filters;
- png_alloc_size_t buf_size;
-
- /* Repeat the checks in png_write_start_row; 1 pixel high or wide
- * images cannot benefit from certain filters. If this isn't done here
- * the check below will fire on 1 pixel high images.
- */
- if (png_ptr->height == 1)
- filters &= ~(PNG_FILTER_UP|PNG_FILTER_AVG|PNG_FILTER_PAETH);
-
- if (png_ptr->width == 1)
- filters &= ~(PNG_FILTER_SUB|PNG_FILTER_AVG|PNG_FILTER_PAETH);
-
- if ((filters & (PNG_FILTER_UP|PNG_FILTER_AVG|PNG_FILTER_PAETH)) != 0
- && png_ptr->prev_row == NULL)
- {
- /* This is the error case, however it is benign - the previous row
- * is not available so the filter can't be used. Just warn here.
- */
- png_app_warning(png_ptr,
- "png_set_filter: UP/AVG/PAETH cannot be added after start");
- filters &= ~(PNG_FILTER_UP|PNG_FILTER_AVG|PNG_FILTER_PAETH);
- }
-
- num_filters = 0;
-
- if (filters & PNG_FILTER_SUB)
- num_filters++;
-
- if (filters & PNG_FILTER_UP)
- num_filters++;
-
- if (filters & PNG_FILTER_AVG)
- num_filters++;
-
- if (filters & PNG_FILTER_PAETH)
- num_filters++;
-
- /* Allocate needed row buffers if they have not already been
- * allocated.
- */
- buf_size = PNG_ROWBYTES(png_ptr->usr_channels * png_ptr->usr_bit_depth,
- png_ptr->width) + 1;
-
- if (png_ptr->try_row == NULL)
- png_ptr->try_row = png_voidcast(png_bytep,
- png_malloc(png_ptr, buf_size));
-
- if (num_filters > 1)
- {
- if (png_ptr->tst_row == NULL)
- png_ptr->tst_row = png_voidcast(png_bytep,
- png_malloc(png_ptr, buf_size));
- }
- }
- png_ptr->do_filter = (png_byte)filters;
-#endif
- }
- else
- png_error(png_ptr, "Unknown custom filter method");
-}
-
-#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* DEPRECATED */
-/* Provide floating and fixed point APIs */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-void PNGAPI
-png_set_filter_heuristics(png_structrp png_ptr, int heuristic_method,
- int num_weights, png_const_doublep filter_weights,
- png_const_doublep filter_costs)
-{
- PNG_UNUSED(png_ptr)
- PNG_UNUSED(heuristic_method)
- PNG_UNUSED(num_weights)
- PNG_UNUSED(filter_weights)
- PNG_UNUSED(filter_costs)
-}
-#endif /* FLOATING_POINT */
-
-#ifdef PNG_FIXED_POINT_SUPPORTED
-void PNGAPI
-png_set_filter_heuristics_fixed(png_structrp png_ptr, int heuristic_method,
- int num_weights, png_const_fixed_point_p filter_weights,
- png_const_fixed_point_p filter_costs)
-{
- PNG_UNUSED(png_ptr)
- PNG_UNUSED(heuristic_method)
- PNG_UNUSED(num_weights)
- PNG_UNUSED(filter_weights)
- PNG_UNUSED(filter_costs)
-}
-#endif /* FIXED_POINT */
-#endif /* WRITE_WEIGHTED_FILTER */
-
-#ifdef PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED
-void PNGAPI
-png_set_compression_level(png_structrp png_ptr, int level)
-{
- png_debug(1, "in png_set_compression_level");
-
- if (png_ptr == NULL)
- return;
-
- png_ptr->zlib_level = level;
-}
-
-void PNGAPI
-png_set_compression_mem_level(png_structrp png_ptr, int mem_level)
-{
- png_debug(1, "in png_set_compression_mem_level");
-
- if (png_ptr == NULL)
- return;
-
- png_ptr->zlib_mem_level = mem_level;
-}
-
-void PNGAPI
-png_set_compression_strategy(png_structrp png_ptr, int strategy)
-{
- png_debug(1, "in png_set_compression_strategy");
-
- if (png_ptr == NULL)
- return;
-
- /* The flag setting here prevents the libpng dynamic selection of strategy.
- */
- png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
- png_ptr->zlib_strategy = strategy;
-}
-
-/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
- * smaller value of window_bits if it can do so safely.
- */
-void PNGAPI
-png_set_compression_window_bits(png_structrp png_ptr, int window_bits)
-{
- if (png_ptr == NULL)
- return;
-
- /* Prior to 1.6.0 this would warn but then set the window_bits value. This
- * meant that negative window bits values could be selected that would cause
- * libpng to write a non-standard PNG file with raw deflate or gzip
- * compressed IDAT or ancillary chunks. Such files can be read and there is
- * no warning on read, so this seems like a very bad idea.
- */
- if (window_bits > 15)
- {
- png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
- window_bits = 15;
- }
-
- else if (window_bits < 8)
- {
- png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
- window_bits = 8;
- }
-
- png_ptr->zlib_window_bits = window_bits;
-}
-
-void PNGAPI
-png_set_compression_method(png_structrp png_ptr, int method)
-{
- png_debug(1, "in png_set_compression_method");
-
- if (png_ptr == NULL)
- return;
-
- /* This would produce an invalid PNG file if it worked, but it doesn't and
- * deflate will fault it, so it is harmless to just warn here.
- */
- if (method != 8)
- png_warning(png_ptr, "Only compression method 8 is supported by PNG");
-
- png_ptr->zlib_method = method;
-}
-#endif /* WRITE_CUSTOMIZE_COMPRESSION */
-
-/* The following were added to libpng-1.5.4 */
-#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
-void PNGAPI
-png_set_text_compression_level(png_structrp png_ptr, int level)
-{
- png_debug(1, "in png_set_text_compression_level");
-
- if (png_ptr == NULL)
- return;
-
- png_ptr->zlib_text_level = level;
-}
-
-void PNGAPI
-png_set_text_compression_mem_level(png_structrp png_ptr, int mem_level)
-{
- png_debug(1, "in png_set_text_compression_mem_level");
-
- if (png_ptr == NULL)
- return;
-
- png_ptr->zlib_text_mem_level = mem_level;
-}
-
-void PNGAPI
-png_set_text_compression_strategy(png_structrp png_ptr, int strategy)
-{
- png_debug(1, "in png_set_text_compression_strategy");
-
- if (png_ptr == NULL)
- return;
-
- png_ptr->zlib_text_strategy = strategy;
-}
-
-/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
- * smaller value of window_bits if it can do so safely.
- */
-void PNGAPI
-png_set_text_compression_window_bits(png_structrp 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");
- window_bits = 15;
- }
-
- else if (window_bits < 8)
- {
- png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
- window_bits = 8;
- }
-
- png_ptr->zlib_text_window_bits = window_bits;
-}
-
-void PNGAPI
-png_set_text_compression_method(png_structrp png_ptr, int method)
-{
- png_debug(1, "in png_set_text_compression_method");
-
- if (png_ptr == NULL)
- return;
-
- if (method != 8)
- png_warning(png_ptr, "Only compression method 8 is supported by PNG");
-
- png_ptr->zlib_text_method = method;
-}
-#endif /* WRITE_CUSTOMIZE_ZTXT_COMPRESSION */
-/* end of API added to libpng-1.5.4 */
-
-void PNGAPI
-png_set_write_status_fn(png_structrp 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_structrp 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_structrp png_ptr, png_inforp info_ptr,
- int transforms, voidp params)
-{
- if (png_ptr == NULL || info_ptr == NULL)
- return;
-
- if ((info_ptr->valid & PNG_INFO_IDAT) == 0)
- {
- png_app_error(png_ptr, "no rows for png_write_image to write");
- return;
- }
-
- /* Write the file header information. */
- png_write_info(png_ptr, info_ptr);
-
- /* ------ these transformations don't touch the info structure ------- */
-
- /* Invert monochrome pixels */
- if ((transforms & PNG_TRANSFORM_INVERT_MONO) != 0)
-#ifdef PNG_WRITE_INVERT_SUPPORTED
- png_set_invert_mono(png_ptr);
-#else
- png_app_error(png_ptr, "PNG_TRANSFORM_INVERT_MONO not supported");
-#endif
-
- /* Shift the pixels up to a legal bit depth and fill in
- * as appropriate to correctly scale the image.
- */
- if ((transforms & PNG_TRANSFORM_SHIFT) != 0)
-#ifdef PNG_WRITE_SHIFT_SUPPORTED
- if ((info_ptr->valid & PNG_INFO_sBIT) != 0)
- png_set_shift(png_ptr, &info_ptr->sig_bit);
-#else
- png_app_error(png_ptr, "PNG_TRANSFORM_SHIFT not supported");
-#endif
-
- /* Pack pixels into bytes */
- if ((transforms & PNG_TRANSFORM_PACKING) != 0)
-#ifdef PNG_WRITE_PACK_SUPPORTED
- png_set_packing(png_ptr);
-#else
- png_app_error(png_ptr, "PNG_TRANSFORM_PACKING not supported");
-#endif
-
- /* Swap location of alpha bytes from ARGB to RGBA */
- if ((transforms & PNG_TRANSFORM_SWAP_ALPHA) != 0)
-#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
- png_set_swap_alpha(png_ptr);
-#else
- png_app_error(png_ptr, "PNG_TRANSFORM_SWAP_ALPHA not supported");
-#endif
-
- /* Remove a filler (X) from XRGB/RGBX/AG/GA into to convert it into
- * RGB, note that the code expects the input color type to be G or RGB; no
- * alpha channel.
- */
- if ((transforms & (PNG_TRANSFORM_STRIP_FILLER_AFTER|
- PNG_TRANSFORM_STRIP_FILLER_BEFORE)) != 0)
- {
-#ifdef PNG_WRITE_FILLER_SUPPORTED
- if ((transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER) != 0)
- {
- if ((transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE) != 0)
- png_app_error(png_ptr,
- "PNG_TRANSFORM_STRIP_FILLER: BEFORE+AFTER not supported");
-
- /* Continue if ignored - this is the pre-1.6.10 behavior */
- png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
- }
-
- else if ((transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE) != 0)
- png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
-#else
- png_app_error(png_ptr, "PNG_TRANSFORM_STRIP_FILLER not supported");
-#endif
- }
-
- /* Flip BGR pixels to RGB */
- if ((transforms & PNG_TRANSFORM_BGR) != 0)
-#ifdef PNG_WRITE_BGR_SUPPORTED
- png_set_bgr(png_ptr);
-#else
- png_app_error(png_ptr, "PNG_TRANSFORM_BGR not supported");
-#endif
-
- /* Swap bytes of 16-bit files to most significant byte first */
- if ((transforms & PNG_TRANSFORM_SWAP_ENDIAN) != 0)
-#ifdef PNG_WRITE_SWAP_SUPPORTED
- png_set_swap(png_ptr);
-#else
- png_app_error(png_ptr, "PNG_TRANSFORM_SWAP_ENDIAN not supported");
-#endif
-
- /* Swap bits of 1-bit, 2-bit, 4-bit packed pixel formats */
- if ((transforms & PNG_TRANSFORM_PACKSWAP) != 0)
-#ifdef PNG_WRITE_PACKSWAP_SUPPORTED
- png_set_packswap(png_ptr);
-#else
- png_app_error(png_ptr, "PNG_TRANSFORM_PACKSWAP not supported");
-#endif
-
- /* Invert the alpha channel from opacity to transparency */
- if ((transforms & PNG_TRANSFORM_INVERT_ALPHA) != 0)
-#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
- png_set_invert_alpha(png_ptr);
-#else
- png_app_error(png_ptr, "PNG_TRANSFORM_INVERT_ALPHA not supported");
-#endif
-
- /* ----------------------- end of transformations ------------------- */
-
- /* Write the bits */
- 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(params)
-}
-#endif
-
-
-#ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED
-/* Initialize the write structure - general purpose utility. */
-static int
-png_image_write_init(png_imagep image)
-{
- png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, image,
- png_safe_error, png_safe_warning);
-
- if (png_ptr != NULL)
- {
- png_infop info_ptr = png_create_info_struct(png_ptr);
-
- if (info_ptr != NULL)
- {
- png_controlp control = png_voidcast(png_controlp,
- png_malloc_warn(png_ptr, (sizeof *control)));
-
- if (control != NULL)
- {
- memset(control, 0, (sizeof *control));
-
- control->png_ptr = png_ptr;
- control->info_ptr = info_ptr;
- control->for_write = 1;
-
- image->opaque = control;
- return 1;
- }
-
- /* Error clean up */
- png_destroy_info_struct(png_ptr, &info_ptr);
- }
-
- png_destroy_write_struct(&png_ptr, NULL);
- }
-
- return png_image_error(image, "png_image_write_: out of memory");
-}
-
-/* Arguments to png_image_write_main: */
-typedef struct
-{
- /* Arguments: */
- png_imagep image;
- png_const_voidp buffer;
- png_int_32 row_stride;
- png_const_voidp colormap;
- int convert_to_8bit;
- /* Local variables: */
- png_const_voidp first_row;
- ptrdiff_t row_bytes;
- png_voidp local_row;
- /* Byte count for memory writing */
- png_bytep memory;
- png_alloc_size_t memory_bytes; /* not used for STDIO */
- png_alloc_size_t output_bytes; /* running total */
-} png_image_write_control;
-
-/* Write png_uint_16 input to a 16-bit PNG; the png_ptr has already been set to
- * do any necessary byte swapping. The component order is defined by the
- * png_image format value.
- */
-static int
-png_write_image_16bit(png_voidp argument)
-{
- png_image_write_control *display = png_voidcast(png_image_write_control*,
- argument);
- png_imagep image = display->image;
- png_structrp png_ptr = image->opaque->png_ptr;
-
- png_const_uint_16p input_row = png_voidcast(png_const_uint_16p,
- display->first_row);
- png_uint_16p output_row = png_voidcast(png_uint_16p, display->local_row);
- png_uint_16p row_end;
- const int channels = (image->format & PNG_FORMAT_FLAG_COLOR) != 0 ? 3 : 1;
- int aindex = 0;
- png_uint_32 y = image->height;
-
- if ((image->format & PNG_FORMAT_FLAG_ALPHA) != 0)
- {
-# ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED
- if ((image->format & PNG_FORMAT_FLAG_AFIRST) != 0)
- {
- aindex = -1;
- ++input_row; /* To point to the first component */
- ++output_row;
- }
- else
- aindex = channels;
-# else
- aindex = channels;
-# endif
- }
-
- else
- png_error(png_ptr, "png_write_image: internal call error");
-
- /* Work out the output row end and count over this, note that the increment
- * above to 'row' means that row_end can actually be beyond the end of the
- * row; this is correct.
- */
- row_end = output_row + image->width * (channels+1);
-
- while (y-- > 0)
- {
- png_const_uint_16p in_ptr = input_row;
- png_uint_16p out_ptr = output_row;
-
- while (out_ptr < row_end)
- {
- const png_uint_16 alpha = in_ptr[aindex];
- png_uint_32 reciprocal = 0;
- int c;
-
- out_ptr[aindex] = alpha;
-
- /* Calculate a reciprocal. The correct calculation is simply
- * component/alpha*65535 << 15. (I.e. 15 bits of precision); this
- * allows correct rounding by adding .5 before the shift. 'reciprocal'
- * is only initialized when required.
- */
- if (alpha > 0 && alpha < 65535)
- reciprocal = ((0xffff<<15)+(alpha>>1))/alpha;
-
- c = channels;
- do /* always at least one channel */
- {
- png_uint_16 component = *in_ptr++;
-
- /* The following gives 65535 for an alpha of 0, which is fine,
- * otherwise if 0/0 is represented as some other value there is more
- * likely to be a discontinuity which will probably damage
- * compression when moving from a fully transparent area to a
- * nearly transparent one. (The assumption here is that opaque
- * areas tend not to be 0 intensity.)
- */
- if (component >= alpha)
- component = 65535;
-
- /* component<alpha, so component/alpha is less than one and
- * component*reciprocal is less than 2^31.
- */
- else if (component > 0 && alpha < 65535)
- {
- png_uint_32 calc = component * reciprocal;
- calc += 16384; /* round to nearest */
- component = (png_uint_16)(calc >> 15);
- }
-
- *out_ptr++ = component;
- }
- while (--c > 0);
-
- /* Skip to next component (skip the intervening alpha channel) */
- ++in_ptr;
- ++out_ptr;
- }
-
- png_write_row(png_ptr, png_voidcast(png_const_bytep, display->local_row));
- input_row += display->row_bytes/(sizeof (png_uint_16));
- }
-
- return 1;
-}
-
-/* Given 16-bit input (1 to 4 channels) write 8-bit output. If an alpha channel
- * is present it must be removed from the components, the components are then
- * written in sRGB encoding. No components are added or removed.
- *
- * Calculate an alpha reciprocal to reverse pre-multiplication. As above the
- * calculation can be done to 15 bits of accuracy; however, the output needs to
- * be scaled in the range 0..255*65535, so include that scaling here.
- */
-# define UNP_RECIPROCAL(alpha) ((((0xffff*0xff)<<7)+(alpha>>1))/alpha)
-
-static png_byte
-png_unpremultiply(png_uint_32 component, png_uint_32 alpha,
- png_uint_32 reciprocal/*from the above macro*/)
-{
- /* The following gives 1.0 for an alpha of 0, which is fine, otherwise if 0/0
- * is represented as some other value there is more likely to be a
- * discontinuity which will probably damage compression when moving from a
- * fully transparent area to a nearly transparent one. (The assumption here
- * is that opaque areas tend not to be 0 intensity.)
- *
- * There is a rounding problem here; if alpha is less than 128 it will end up
- * as 0 when scaled to 8 bits. To avoid introducing spurious colors into the
- * output change for this too.
- */
- if (component >= alpha || alpha < 128)
- return 255;
-
- /* component<alpha, so component/alpha is less than one and
- * component*reciprocal is less than 2^31.
- */
- else if (component > 0)
- {
- /* The test is that alpha/257 (rounded) is less than 255, the first value
- * that becomes 255 is 65407.
- * NOTE: this must agree with the PNG_DIV257 macro (which must, therefore,
- * be exact!) [Could also test reciprocal != 0]
- */
- if (alpha < 65407)
- {
- component *= reciprocal;
- component += 64; /* round to nearest */
- component >>= 7;
- }
-
- else
- component *= 255;
-
- /* Convert the component to sRGB. */
- return (png_byte)PNG_sRGB_FROM_LINEAR(component);
- }
-
- else
- return 0;
-}
-
-static int
-png_write_image_8bit(png_voidp argument)
-{
- png_image_write_control *display = png_voidcast(png_image_write_control*,
- argument);
- png_imagep image = display->image;
- png_structrp png_ptr = image->opaque->png_ptr;
-
- png_const_uint_16p input_row = png_voidcast(png_const_uint_16p,
- display->first_row);
- png_bytep output_row = png_voidcast(png_bytep, display->local_row);
- png_uint_32 y = image->height;
- const int channels = (image->format & PNG_FORMAT_FLAG_COLOR) != 0 ? 3 : 1;
-
- if ((image->format & PNG_FORMAT_FLAG_ALPHA) != 0)
- {
- png_bytep row_end;
- int aindex;
-
-# ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED
- if ((image->format & PNG_FORMAT_FLAG_AFIRST) != 0)
- {
- aindex = -1;
- ++input_row; /* To point to the first component */
- ++output_row;
- }
-
- else
-# endif
- aindex = channels;
-
- /* Use row_end in place of a loop counter: */
- row_end = output_row + image->width * (channels+1);
-
- while (y-- > 0)
- {
- png_const_uint_16p in_ptr = input_row;
- png_bytep out_ptr = output_row;
-
- while (out_ptr < row_end)
- {
- png_uint_16 alpha = in_ptr[aindex];
- png_byte alphabyte = (png_byte)PNG_DIV257(alpha);
- png_uint_32 reciprocal = 0;
- int c;
-
- /* Scale and write the alpha channel. */
- out_ptr[aindex] = alphabyte;
-
- if (alphabyte > 0 && alphabyte < 255)
- reciprocal = UNP_RECIPROCAL(alpha);
-
- c = channels;
- do /* always at least one channel */
- *out_ptr++ = png_unpremultiply(*in_ptr++, alpha, reciprocal);
- while (--c > 0);
-
- /* Skip to next component (skip the intervening alpha channel) */
- ++in_ptr;
- ++out_ptr;
- } /* while out_ptr < row_end */
-
- png_write_row(png_ptr, png_voidcast(png_const_bytep,
- display->local_row));
- input_row += display->row_bytes/(sizeof (png_uint_16));
- } /* while y */
- }
-
- else
- {
- /* No alpha channel, so the row_end really is the end of the row and it
- * is sufficient to loop over the components one by one.
- */
- png_bytep row_end = output_row + image->width * channels;
-
- while (y-- > 0)
- {
- png_const_uint_16p in_ptr = input_row;
- png_bytep out_ptr = output_row;
-
- while (out_ptr < row_end)
- {
- png_uint_32 component = *in_ptr++;
-
- component *= 255;
- *out_ptr++ = (png_byte)PNG_sRGB_FROM_LINEAR(component);
- }
-
- png_write_row(png_ptr, output_row);
- input_row += display->row_bytes/(sizeof (png_uint_16));
- }
- }
-
- return 1;
-}
-
-static void
-png_image_set_PLTE(png_image_write_control *display)
-{
- const png_imagep image = display->image;
- const void *cmap = display->colormap;
- const int entries = image->colormap_entries > 256 ? 256 :
- (int)image->colormap_entries;
-
- /* NOTE: the caller must check for cmap != NULL and entries != 0 */
- const png_uint_32 format = image->format;
- const int channels = PNG_IMAGE_SAMPLE_CHANNELS(format);
-
-# if defined(PNG_FORMAT_BGR_SUPPORTED) &&\
- defined(PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED)
- const int afirst = (format & PNG_FORMAT_FLAG_AFIRST) != 0 &&
- (format & PNG_FORMAT_FLAG_ALPHA) != 0;
-# else
-# define afirst 0
-# endif
-
-# ifdef PNG_FORMAT_BGR_SUPPORTED
- const int bgr = (format & PNG_FORMAT_FLAG_BGR) != 0 ? 2 : 0;
-# else
-# define bgr 0
-# endif
-
- int i, num_trans;
- png_color palette[256];
- png_byte tRNS[256];
-
- memset(tRNS, 255, (sizeof tRNS));
- memset(palette, 0, (sizeof palette));
-
- for (i=num_trans=0; i<entries; ++i)
- {
- /* This gets automatically converted to sRGB with reversal of the
- * pre-multiplication if the color-map has an alpha channel.
- */
- if ((format & PNG_FORMAT_FLAG_LINEAR) != 0)
- {
- png_const_uint_16p entry = png_voidcast(png_const_uint_16p, cmap);
-
- entry += i * channels;
-
- if ((channels & 1) != 0) /* no alpha */
- {
- if (channels >= 3) /* RGB */
- {
- palette[i].blue = (png_byte)PNG_sRGB_FROM_LINEAR(255 *
- entry[(2 ^ bgr)]);
- palette[i].green = (png_byte)PNG_sRGB_FROM_LINEAR(255 *
- entry[1]);
- palette[i].red = (png_byte)PNG_sRGB_FROM_LINEAR(255 *
- entry[bgr]);
- }
-
- else /* Gray */
- palette[i].blue = palette[i].red = palette[i].green =
- (png_byte)PNG_sRGB_FROM_LINEAR(255 * *entry);
- }
-
- else /* alpha */
- {
- png_uint_16 alpha = entry[afirst ? 0 : channels-1];
- png_byte alphabyte = (png_byte)PNG_DIV257(alpha);
- png_uint_32 reciprocal = 0;
-
- /* Calculate a reciprocal, as in the png_write_image_8bit code above
- * this is designed to produce a value scaled to 255*65535 when
- * divided by 128 (i.e. asr 7).
- */
- if (alphabyte > 0 && alphabyte < 255)
- reciprocal = (((0xffff*0xff)<<7)+(alpha>>1))/alpha;
-
- tRNS[i] = alphabyte;
- if (alphabyte < 255)
- num_trans = i+1;
-
- if (channels >= 3) /* RGB */
- {
- palette[i].blue = png_unpremultiply(entry[afirst + (2 ^ bgr)],
- alpha, reciprocal);
- palette[i].green = png_unpremultiply(entry[afirst + 1], alpha,
- reciprocal);
- palette[i].red = png_unpremultiply(entry[afirst + bgr], alpha,
- reciprocal);
- }
-
- else /* gray */
- palette[i].blue = palette[i].red = palette[i].green =
- png_unpremultiply(entry[afirst], alpha, reciprocal);
- }
- }
-
- else /* Color-map has sRGB values */
- {
- png_const_bytep entry = png_voidcast(png_const_bytep, cmap);
-
- entry += i * channels;
-
- switch (channels)
- {
- case 4:
- tRNS[i] = entry[afirst ? 0 : 3];
- if (tRNS[i] < 255)
- num_trans = i+1;
- /* FALL THROUGH */
- case 3:
- palette[i].blue = entry[afirst + (2 ^ bgr)];
- palette[i].green = entry[afirst + 1];
- palette[i].red = entry[afirst + bgr];
- break;
-
- case 2:
- tRNS[i] = entry[1 ^ afirst];
- if (tRNS[i] < 255)
- num_trans = i+1;
- /* FALL THROUGH */
- case 1:
- palette[i].blue = palette[i].red = palette[i].green =
- entry[afirst];
- break;
-
- default:
- break;
- }
- }
- }
-
-# ifdef afirst
-# undef afirst
-# endif
-# ifdef bgr
-# undef bgr
-# endif
-
- png_set_PLTE(image->opaque->png_ptr, image->opaque->info_ptr, palette,
- entries);
-
- if (num_trans > 0)
- png_set_tRNS(image->opaque->png_ptr, image->opaque->info_ptr, tRNS,
- num_trans, NULL);
-
- image->colormap_entries = entries;
-}
-
-static int
-png_image_write_main(png_voidp argument)
-{
- png_image_write_control *display = png_voidcast(png_image_write_control*,
- argument);
- png_imagep image = display->image;
- png_structrp png_ptr = image->opaque->png_ptr;
- png_inforp info_ptr = image->opaque->info_ptr;
- png_uint_32 format = image->format;
-
- /* The following four ints are actually booleans */
- int colormap = (format & PNG_FORMAT_FLAG_COLORMAP);
- int linear = !colormap && (format & PNG_FORMAT_FLAG_LINEAR); /* input */
- int alpha = !colormap && (format & PNG_FORMAT_FLAG_ALPHA);
- int write_16bit = linear && !colormap && (display->convert_to_8bit == 0);
-
-# ifdef PNG_BENIGN_ERRORS_SUPPORTED
- /* Make sure we error out on any bad situation */
- png_set_benign_errors(png_ptr, 0/*error*/);
-# endif
-
- /* Default the 'row_stride' parameter if required, also check the row stride
- * and total image size to ensure that they are within the system limits.
- */
- {
- const unsigned int channels = PNG_IMAGE_PIXEL_CHANNELS(image->format);
-
- if (image->width <= 0x7FFFFFFFU/channels) /* no overflow */
- {
- png_uint_32 check;
- const png_uint_32 png_row_stride = image->width * channels;
-
- if (display->row_stride == 0)
- display->row_stride = (png_int_32)/*SAFE*/png_row_stride;
-
- if (display->row_stride < 0)
- check = -display->row_stride;
-
- else
- check = display->row_stride;
-
- if (check >= png_row_stride)
- {
- /* Now check for overflow of the image buffer calculation; this
- * limits the whole image size to 32 bits for API compatibility with
- * the current, 32-bit, PNG_IMAGE_BUFFER_SIZE macro.
- */
- if (image->height > 0xFFFFFFFF/png_row_stride)
- png_error(image->opaque->png_ptr, "memory image too large");
- }
-
- else
- png_error(image->opaque->png_ptr, "supplied row stride too small");
- }
-
- else
- png_error(image->opaque->png_ptr, "image row stride too large");
- }
-
- /* Set the required transforms then write the rows in the correct order. */
- if ((format & PNG_FORMAT_FLAG_COLORMAP) != 0)
- {
- if (display->colormap != NULL && image->colormap_entries > 0)
- {
- png_uint_32 entries = image->colormap_entries;
-
- png_set_IHDR(png_ptr, info_ptr, image->width, image->height,
- entries > 16 ? 8 : (entries > 4 ? 4 : (entries > 2 ? 2 : 1)),
- PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE,
- PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
-
- png_image_set_PLTE(display);
- }
-
- else
- png_error(image->opaque->png_ptr,
- "no color-map for color-mapped image");
- }
-
- else
- png_set_IHDR(png_ptr, info_ptr, image->width, image->height,
- write_16bit ? 16 : 8,
- ((format & PNG_FORMAT_FLAG_COLOR) ? PNG_COLOR_MASK_COLOR : 0) +
- ((format & PNG_FORMAT_FLAG_ALPHA) ? PNG_COLOR_MASK_ALPHA : 0),
- PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
-
- /* Counter-intuitively the data transformations must be called *after*
- * png_write_info, not before as in the read code, but the 'set' functions
- * must still be called before. Just set the color space information, never
- * write an interlaced image.
- */
-
- if (write_16bit != 0)
- {
- /* The gamma here is 1.0 (linear) and the cHRM chunk matches sRGB. */
- png_set_gAMA_fixed(png_ptr, info_ptr, PNG_GAMMA_LINEAR);
-
- if ((image->flags & PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB) == 0)
- png_set_cHRM_fixed(png_ptr, info_ptr,
- /* color x y */
- /* white */ 31270, 32900,
- /* red */ 64000, 33000,
- /* green */ 30000, 60000,
- /* blue */ 15000, 6000
- );
- }
-
- else if ((image->flags & PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB) == 0)
- png_set_sRGB(png_ptr, info_ptr, PNG_sRGB_INTENT_PERCEPTUAL);
-
- /* Else writing an 8-bit file and the *colors* aren't sRGB, but the 8-bit
- * space must still be gamma encoded.
- */
- else
- png_set_gAMA_fixed(png_ptr, info_ptr, PNG_GAMMA_sRGB_INVERSE);
-
- /* Write the file header. */
- png_write_info(png_ptr, info_ptr);
-
- /* Now set up the data transformations (*after* the header is written),
- * remove the handled transformations from the 'format' flags for checking.
- *
- * First check for a little endian system if writing 16-bit files.
- */
- if (write_16bit != 0)
- {
- PNG_CONST png_uint_16 le = 0x0001;
-
- if ((*(png_const_bytep) & le) != 0)
- png_set_swap(png_ptr);
- }
-
-# ifdef PNG_SIMPLIFIED_WRITE_BGR_SUPPORTED
- if ((format & PNG_FORMAT_FLAG_BGR) != 0)
- {
- if (colormap == 0 && (format & PNG_FORMAT_FLAG_COLOR) != 0)
- png_set_bgr(png_ptr);
- format &= ~PNG_FORMAT_FLAG_BGR;
- }
-# endif
-
-# ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED
- if ((format & PNG_FORMAT_FLAG_AFIRST) != 0)
- {
- if (colormap == 0 && (format & PNG_FORMAT_FLAG_ALPHA) != 0)
- png_set_swap_alpha(png_ptr);
- format &= ~PNG_FORMAT_FLAG_AFIRST;
- }
-# endif
-
- /* If there are 16 or fewer color-map entries we wrote a lower bit depth
- * above, but the application data is still byte packed.
- */
- if (colormap != 0 && image->colormap_entries <= 16)
- png_set_packing(png_ptr);
-
- /* That should have handled all (both) the transforms. */
- if ((format & ~(png_uint_32)(PNG_FORMAT_FLAG_COLOR | PNG_FORMAT_FLAG_LINEAR |
- PNG_FORMAT_FLAG_ALPHA | PNG_FORMAT_FLAG_COLORMAP)) != 0)
- png_error(png_ptr, "png_write_image: unsupported transformation");
-
- {
- png_const_bytep row = png_voidcast(png_const_bytep, display->buffer);
- ptrdiff_t row_bytes = display->row_stride;
-
- if (linear != 0)
- row_bytes *= (sizeof (png_uint_16));
-
- if (row_bytes < 0)
- row += (image->height-1) * (-row_bytes);
-
- display->first_row = row;
- display->row_bytes = row_bytes;
- }
-
- /* Apply 'fast' options if the flag is set. */
- if ((image->flags & PNG_IMAGE_FLAG_FAST) != 0)
- {
- png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_NO_FILTERS);
- /* NOTE: determined by experiment using pngstest, this reflects some
- * balance between the time to write the image once and the time to read
- * it about 50 times. The speed-up in pngstest was about 10-20% of the
- * total (user) time on a heavily loaded system.
- */
-# ifdef PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED
- png_set_compression_level(png_ptr, 3);
-# endif
- }
-
- /* Check for the cases that currently require a pre-transform on the row
- * before it is written. This only applies when the input is 16-bit and
- * either there is an alpha channel or it is converted to 8-bit.
- */
- if ((linear != 0 && alpha != 0 ) ||
- (colormap == 0 && display->convert_to_8bit != 0))
- {
- png_bytep row = png_voidcast(png_bytep, png_malloc(png_ptr,
- png_get_rowbytes(png_ptr, info_ptr)));
- int result;
-
- display->local_row = row;
- if (write_16bit != 0)
- result = png_safe_execute(image, png_write_image_16bit, display);
- else
- result = png_safe_execute(image, png_write_image_8bit, display);
- display->local_row = NULL;
-
- png_free(png_ptr, row);
-
- /* Skip the 'write_end' on error: */
- if (result == 0)
- return 0;
- }
-
- /* Otherwise this is the case where the input is in a format currently
- * supported by the rest of the libpng write code; call it directly.
- */
- else
- {
- png_const_bytep row = png_voidcast(png_const_bytep, display->first_row);
- ptrdiff_t row_bytes = display->row_bytes;
- png_uint_32 y = image->height;
-
- while (y-- > 0)
- {
- png_write_row(png_ptr, row);
- row += row_bytes;
- }
- }
-
- png_write_end(png_ptr, info_ptr);
- return 1;
-}
-
-
-static void (PNGCBAPI
-image_memory_write)(png_structp png_ptr, png_bytep/*const*/ data,
- png_size_t size)
-{
- png_image_write_control *display = png_voidcast(png_image_write_control*,
- png_ptr->io_ptr/*backdoor: png_get_io_ptr(png_ptr)*/);
- const png_alloc_size_t ob = display->output_bytes;
-
- /* Check for overflow; this should never happen: */
- if (size <= ((png_alloc_size_t)-1) - ob)
- {
- /* I don't think libpng ever does this, but just in case: */
- if (size > 0)
- {
- if (display->memory_bytes >= ob+size) /* writing */
- memcpy(display->memory+ob, data, size);
-
- /* Always update the size: */
- display->output_bytes = ob+size;
- }
- }
-
- else
- png_error(png_ptr, "png_image_write_to_memory: PNG too big");
-}
-
-static void (PNGCBAPI
-image_memory_flush)(png_structp png_ptr)
-{
- PNG_UNUSED(png_ptr)
-}
-
-static int
-png_image_write_memory(png_voidp argument)
-{
- png_image_write_control *display = png_voidcast(png_image_write_control*,
- argument);
-
- /* The rest of the memory-specific init and write_main in an error protected
- * environment. This case needs to use callbacks for the write operations
- * since libpng has no built in support for writing to memory.
- */
- png_set_write_fn(display->image->opaque->png_ptr, display/*io_ptr*/,
- image_memory_write, image_memory_flush);
-
- return png_image_write_main(display);
-}
-
-int PNGAPI
-png_image_write_to_memory(png_imagep image, void *memory,
- png_alloc_size_t * PNG_RESTRICT memory_bytes, int convert_to_8bit,
- const void *buffer, png_int_32 row_stride, const void *colormap)
-{
- /* Write the image to the given buffer, or count the bytes if it is NULL */
- if (image != NULL && image->version == PNG_IMAGE_VERSION)
- {
- if (memory_bytes != NULL && buffer != NULL)
- {
- /* This is to give the caller an easier error detection in the NULL
- * case and guard against uninitialized variable problems:
- */
- if (memory == NULL)
- *memory_bytes = 0;
-
- if (png_image_write_init(image) != 0)
- {
- png_image_write_control display;
- int result;
-
- memset(&display, 0, (sizeof display));
- display.image = image;
- display.buffer = buffer;
- display.row_stride = row_stride;
- display.colormap = colormap;
- display.convert_to_8bit = convert_to_8bit;
- display.memory = png_voidcast(png_bytep, memory);
- display.memory_bytes = *memory_bytes;
- display.output_bytes = 0;
-
- result = png_safe_execute(image, png_image_write_memory, &display);
- png_image_free(image);
-
- /* write_memory returns true even if we ran out of buffer. */
- if (result)
- {
- /* On out-of-buffer this function returns '0' but still updates
- * memory_bytes:
- */
- if (memory != NULL && display.output_bytes > *memory_bytes)
- result = 0;
-
- *memory_bytes = display.output_bytes;
- }
-
- return result;
- }
-
- else
- return 0;
- }
-
- else
- return png_image_error(image,
- "png_image_write_to_memory: invalid argument");
- }
-
- else if (image != NULL)
- return png_image_error(image,
- "png_image_write_to_memory: incorrect PNG_IMAGE_VERSION");
-
- else
- return 0;
-}
-
-#ifdef PNG_SIMPLIFIED_WRITE_STDIO_SUPPORTED
-int PNGAPI
-png_image_write_to_stdio(png_imagep image, FILE *file, int convert_to_8bit,
- const void *buffer, png_int_32 row_stride, const void *colormap)
-{
- /* Write the image to the given (FILE*). */
- if (image != NULL && image->version == PNG_IMAGE_VERSION)
- {
- if (file != NULL && buffer != NULL)
- {
- if (png_image_write_init(image) != 0)
- {
- png_image_write_control display;
- int result;
-
- /* This is slightly evil, but png_init_io doesn't do anything other
- * than this and we haven't changed the standard IO functions so
- * this saves a 'safe' function.
- */
- image->opaque->png_ptr->io_ptr = file;
-
- memset(&display, 0, (sizeof display));
- display.image = image;
- display.buffer = buffer;
- display.row_stride = row_stride;
- display.colormap = colormap;
- display.convert_to_8bit = convert_to_8bit;
-
- result = png_safe_execute(image, png_image_write_main, &display);
- png_image_free(image);
- return result;
- }
-
- else
- return 0;
- }
-
- else
- return png_image_error(image,
- "png_image_write_to_stdio: invalid argument");
- }
-
- else if (image != NULL)
- return png_image_error(image,
- "png_image_write_to_stdio: incorrect PNG_IMAGE_VERSION");
-
- else
- return 0;
-}
-
-int PNGAPI
-png_image_write_to_file(png_imagep image, const char *file_name,
- int convert_to_8bit, const void *buffer, png_int_32 row_stride,
- const void *colormap)
-{
- /* Write the image to the named file. */
- if (image != NULL && image->version == PNG_IMAGE_VERSION)
- {
- if (file_name != NULL && buffer != NULL)
- {
- FILE *fp = fopen(file_name, "wb");
-
- if (fp != NULL)
- {
- if (png_image_write_to_stdio(image, fp, convert_to_8bit, buffer,
- row_stride, colormap) != 0)
- {
- int error; /* from fflush/fclose */
-
- /* Make sure the file is flushed correctly. */
- if (fflush(fp) == 0 && ferror(fp) == 0)
- {
- if (fclose(fp) == 0)
- return 1;
-
- error = errno; /* from fclose */
- }
-
- else
- {
- error = errno; /* from fflush or ferror */
- (void)fclose(fp);
- }
-
- (void)remove(file_name);
- /* The image has already been cleaned up; this is just used to
- * set the error (because the original write succeeded).
- */
- return png_image_error(image, strerror(error));
- }
-
- else
- {
- /* Clean up: just the opened file. */
- (void)fclose(fp);
- (void)remove(file_name);
- return 0;
- }
- }
-
- else
- return png_image_error(image, strerror(errno));
- }
-
- else
- return png_image_error(image,
- "png_image_write_to_file: invalid argument");
- }
-
- else if (image != NULL)
- return png_image_error(image,
- "png_image_write_to_file: incorrect PNG_IMAGE_VERSION");
-
- else
- return 0;
-}
-#endif /* SIMPLIFIED_WRITE_STDIO */
-#endif /* SIMPLIFIED_WRITE */
-#endif /* WRITE */