third_party/lpng_v163/pngwrite.c - Issue 1591483003: XFA: Upgrade libpng to 1.6.20.

Unified Diff: third_party/lpng_v163/pngwrite.c

Issue 1591483003: XFA: Upgrade libpng to 1.6.20. (Closed) Base URL: https://pdfium.googlesource.com/pdfium.git@xfa

Patch Set: rebase Created 4 years, 11 months ago

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Index: third_party/lpng_v163/pngwrite.c

diff --git a/third_party/lpng_v163/pngwrite.c b/third_party/lpng_v163/pngwrite.c

deleted file mode 100644

index f48ed970ffd1308048e8100364b559b22dfcfd30..0000000000000000000000000000000000000000

--- a/third_party/lpng_v163/pngwrite.c

+++ /dev/null

@@ -1,2329 +0,0 @@

-/* pngwrite.c - general routines to write a PNG file

- *

- * Last changed in libpng 1.6.2 [April 25, 2013]

- *

- * 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"

-#if defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) && defined(PNG_STDIO_SUPPORTED)

-# include <errno.h>

-#endif

-#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)

- {

- 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)

- {

- /* 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 /* PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED */

-/* Writes all the PNG information. This is the suggested way to use the

- * library. If you have a new chunk to add, make a function to write it,

- * and put it in the correct location here. If you want the chunk written

- * after the image data, put it in png_write_end(). I strongly encourage

- * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing

- * the chunk, as that will keep the code from breaking if you want to just

- * write a plain PNG file. If you have long comments, I suggest writing

- * them in png_write_end(), and compressing them.

- */

-void PNGAPI

-png_write_info_before_PLTE(png_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))

- {

- /* 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.

- *

- * 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 and

- * 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) &&

- (info_ptr->colorspace.flags & PNG_COLORSPACE_FROM_gAMA) &&

- (info_ptr->valid & PNG_INFO_gAMA))

- 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) &&

- (info_ptr->valid & PNG_INFO_iCCP))

- {

-# ifdef PNG_WRITE_sRGB_SUPPORTED

- if (info_ptr->valid & PNG_INFO_sRGB)

- 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

-# ifdef PNG_WRITE_sRGB_SUPPORTED

- if (!(info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) &&

- (info_ptr->valid & PNG_INFO_sRGB))

- 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)

- 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) &&

- (info_ptr->colorspace.flags & PNG_COLORSPACE_FROM_cHRM) &&

- (info_ptr->valid & PNG_INFO_cHRM))

- 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)

- 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_WRITE_sCAL_SUPPORTED

- if (info_ptr->valid & PNG_INFO_sCAL)

- 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)

- 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

- 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))

- 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) &&

- !(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

- 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 /* PNG_USER_MEM_SUPPORTED */

- 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 /* PNG_WRITE_COMPRESSED_TEXT_SUPPORTED */

- /* 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

- png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN;

- /* In stable builds only warn if an application error can be completely

- * handled.

- */

-#endif

- /* App warnings are warnings in release (or release candidate) builds but

- * are errors during development.

- */

-#if PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC

- 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);

- }

-/* 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))

- 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;

- 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))

- {

- 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))

- {

- png_write_finish_row(png_ptr);

- return;

- }

-#endif

-#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED

- /* Handle other transformations */

- if (png_ptr->transformations)

- 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) &&

- (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 /* PNG_WRITE_FLUSH_SUPPORTED */

-#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED

-static void png_reset_filter_heuristics(png_structrp png_ptr);/* forward decl */

-#endif

-/* 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)

- 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);

-#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_WRITE_WEIGHTED_FILTER_SUPPORTED

- /* Use this to save a little code space, it doesn't free the filter_costs */

- png_reset_filter_heuristics(png_ptr);

- png_free(png_ptr, png_ptr->filter_costs);

- png_free(png_ptr, png_ptr->inv_filter_costs);

-#endif

-#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED

- png_free(png_ptr, png_ptr->chunk_list);

-#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) &&

- (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 /* PNG_WRITE_FILTER_SUPPORTED */

- case PNG_FILTER_VALUE_NONE:

- png_ptr->do_filter = PNG_FILTER_NONE; break;

-#ifdef PNG_WRITE_FILTER_SUPPORTED

- case PNG_FILTER_VALUE_SUB:

- png_ptr->do_filter = PNG_FILTER_SUB; break;

- case PNG_FILTER_VALUE_UP:

- png_ptr->do_filter = PNG_FILTER_UP; break;

- case PNG_FILTER_VALUE_AVG:

- png_ptr->do_filter = PNG_FILTER_AVG; break;

- case PNG_FILTER_VALUE_PAETH:

- png_ptr->do_filter = PNG_FILTER_PAETH; break;

- default:

- png_ptr->do_filter = (png_byte)filters; break;

-#else

- default:

- png_app_error(png_ptr, "Unknown row filter for method 0");

-#endif /* PNG_WRITE_FILTER_SUPPORTED */

- }

- /* If we have allocated the row_buf, this means we have already started

- * 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_byte)(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_byte)(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 */

-/* Convenience reset API. */

-static void

-png_reset_filter_heuristics(png_structrp png_ptr)

- /* Clear out any old values in the 'weights' - this must be done because if

- * the app calls set_filter_heuristics multiple times with different

- * 'num_weights' values we would otherwise potentially have wrong sized

- * arrays.

- */

- png_ptr->num_prev_filters = 0;

- png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;

- if (png_ptr->prev_filters != NULL)

- {

- png_bytep old = png_ptr->prev_filters;

- png_ptr->prev_filters = NULL;

- png_free(png_ptr, old);

- }

- if (png_ptr->filter_weights != NULL)

- {

- png_uint_16p old = png_ptr->filter_weights;

- png_ptr->filter_weights = NULL;

- png_free(png_ptr, old);

- }

- if (png_ptr->inv_filter_weights != NULL)

- {

- png_uint_16p old = png_ptr->inv_filter_weights;

- png_ptr->inv_filter_weights = NULL;

- png_free(png_ptr, old);

- }

- /* Leave the filter_costs - this array is fixed size. */

-static int

-png_init_filter_heuristics(png_structrp png_ptr, int heuristic_method,

- int num_weights)

- if (png_ptr == NULL)

- return 0;

- /* Clear out the arrays */

- png_reset_filter_heuristics(png_ptr);

- /* Check arguments; the 'reset' function makes the correct settings for the

- * unweighted case, but we must handle the weight case by initializing the

- * arrays for the caller.

- */

- if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)

- {

- int i;

- if (num_weights > 0)

- {

- png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,

- (png_uint_32)((sizeof (png_byte)) * num_weights));

- /* To make sure that the weighting starts out fairly */

- for (i = 0; i < num_weights; i++)

- {

- png_ptr->prev_filters[i] = 255;

- }

- png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,

- (png_uint_32)((sizeof (png_uint_16)) * num_weights));

- png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,

- (png_uint_32)((sizeof (png_uint_16)) * num_weights));

- for (i = 0; i < num_weights; i++)

- {

- png_ptr->inv_filter_weights[i] =

- png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;

- }

- /* Safe to set this now */

- png_ptr->num_prev_filters = (png_byte)num_weights;

- }

- /* If, in the future, there are other filter methods, this would

- * need to be based on png_ptr->filter.

- */

- if (png_ptr->filter_costs == NULL)

- {

- png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,

- (png_uint_32)((sizeof (png_uint_16)) * PNG_FILTER_VALUE_LAST));

- png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,

- (png_uint_32)((sizeof (png_uint_16)) * PNG_FILTER_VALUE_LAST));

- }

- for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)

- {

- png_ptr->inv_filter_costs[i] =

- png_ptr->filter_costs[i] = PNG_COST_FACTOR;

- }

- /* All the arrays are inited, safe to set this: */

- png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_WEIGHTED;

- /* Return the 'ok' code. */

- return 1;

- }

- else if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT ||

- heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)

- {

- return 1;

- }

- else

- {

- png_warning(png_ptr, "Unknown filter heuristic method");

- return 0;

- }

-/* 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_debug(1, "in png_set_filter_heuristics");

- /* The internal API allocates all the arrays and ensures that the elements of

- * those arrays are set to the default value.

- */

- if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights))

- return;

- /* If using the weighted method copy in the weights. */

- if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)

- {

- int i;

- for (i = 0; i < num_weights; i++)

- {

- if (filter_weights[i] <= 0.0)

- {

- png_ptr->inv_filter_weights[i] =

- png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;

- }

- else

- {

- png_ptr->inv_filter_weights[i] =

- (png_uint_16)(PNG_WEIGHT_FACTOR*filter_weights[i]+.5);

- png_ptr->filter_weights[i] =

- (png_uint_16)(PNG_WEIGHT_FACTOR/filter_weights[i]+.5);

- }

- /* Here is where we set the relative costs of the different filters. We

- * should take the desired compression level into account when setting

- * the costs, so that Paeth, for instance, has a high relative cost at low

- * compression levels, while it has a lower relative cost at higher

- * compression settings. The filter types are in order of increasing

- * relative cost, so it would be possible to do this with an algorithm.

- */

- for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) if (filter_costs[i] >= 1.0)

- {

- png_ptr->inv_filter_costs[i] =

- (png_uint_16)(PNG_COST_FACTOR / filter_costs[i] + .5);

- png_ptr->filter_costs[i] =

- (png_uint_16)(PNG_COST_FACTOR * filter_costs[i] + .5);

- }

-#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_debug(1, "in png_set_filter_heuristics_fixed");

- /* The internal API allocates all the arrays and ensures that the elements of

- * those arrays are set to the default value.

- */

- if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights))

- return;

- /* If using the weighted method copy in the weights. */

- if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)

- {

- int i;

- for (i = 0; i < num_weights; i++)

- {

- if (filter_weights[i] <= 0)

- {

- png_ptr->inv_filter_weights[i] =

- png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;

- }

- else

- {

- png_ptr->inv_filter_weights[i] = (png_uint_16)

- ((PNG_WEIGHT_FACTOR*filter_weights[i]+PNG_FP_HALF)/PNG_FP_1);

- png_ptr->filter_weights[i] = (png_uint_16)((PNG_WEIGHT_FACTOR*

- PNG_FP_1+(filter_weights[i]/2))/filter_weights[i]);

- }

- /* Here is where we set the relative costs of the different filters. We

- * should take the desired compression level into account when setting

- * the costs, so that Paeth, for instance, has a high relative cost at low

- * compression levels, while it has a lower relative cost at higher

- * compression settings. The filter types are in order of increasing

- * relative cost, so it would be possible to do this with an algorithm.

- */

- for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)

- if (filter_costs[i] >= PNG_FP_1)

- {

- png_uint_32 tmp;

- /* Use a 32 bit unsigned temporary here because otherwise the

- * intermediate value will be a 32 bit *signed* integer (ANSI rules)

- * and this will get the wrong answer on division.

- */

- tmp = PNG_COST_FACTOR*PNG_FP_1 + (filter_costs[i]/2);

- tmp /= filter_costs[i];

- png_ptr->inv_filter_costs[i] = (png_uint_16)tmp;

- tmp = PNG_COST_FACTOR * filter_costs[i] + PNG_FP_HALF;

- tmp /= PNG_FP_1;

- png_ptr->filter_costs[i] = (png_uint_16)tmp;

- }

-#endif /* FIXED_POINT */

-#endif /* PNG_WRITE_WEIGHTED_FILTER_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 which 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;

-/* 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 /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */

-/* 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;

- /* 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

-#ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED

-#ifdef PNG_STDIO_SUPPORTED /* currently required for png_image_write_* */

-/* 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;

-} 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) ? 3 : 1;

- int aindex = 0;

- png_uint_32 y = image->height;

- if (image->format & PNG_FORMAT_FLAG_ALPHA)

- {

- if (image->format & PNG_FORMAT_FLAG_AFIRST)

- {

- aindex = -1;

- ++input_row; /* To point to the first component */

- ++output_row;

- }

- else

- aindex = channels;

- }

- 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) ? 3 : 1;

- if (image->format & PNG_FORMAT_FLAG_ALPHA)

- {

- png_bytep row_end;

- int aindex;

- if (image->format & PNG_FORMAT_FLAG_AFIRST)

- {

- aindex = -1;

- ++input_row; /* To point to the first component */

- ++output_row;

- }

- else

- 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);

-# ifdef PNG_FORMAT_BGR_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) ? 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)

- {

- png_const_uint_16p entry = png_voidcast(png_const_uint_16p, cmap);

- entry += i * channels;

- if (channels & 1) /* 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;

- int colormap = (format & PNG_FORMAT_FLAG_COLORMAP) != 0;

- int linear = !colormap && (format & PNG_FORMAT_FLAG_LINEAR) != 0; /* input */

- int alpha = !colormap && (format & PNG_FORMAT_FLAG_ALPHA) != 0;

- int write_16bit = linear && !colormap && !display->convert_to_8bit;

-# 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. */

- if (display->row_stride == 0)

- display->row_stride = PNG_IMAGE_ROW_STRIDE(*image);

- /* Set the required transforms then write the rows in the correct order. */

- if (format & PNG_FORMAT_FLAG_COLORMAP)

- {

- 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)

- {

- /* 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))

- 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))

- 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)

- {

- PNG_CONST png_uint_16 le = 0x0001;

- if (*(png_const_bytep)&le)

- png_set_swap(png_ptr);

- }

-# ifdef PNG_SIMPLIFIED_WRITE_BGR_SUPPORTED

- if (format & PNG_FORMAT_FLAG_BGR)

- {

- if (!colormap && (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)

- {

- if (!colormap && (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 && 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)

- 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.

- */

- png_set_compression_level(png_ptr, 3);

- }

- /* 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 && alpha) || (!colormap && display->convert_to_8bit))

- {

- 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)

- 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)

- 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;

-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)

- {

- if (png_image_write_init(image))

- {

- 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)

- {

- FILE *fp = fopen(file_name, "wb");

- if (fp != NULL)

- {

- if (png_image_write_to_stdio(image, fp, convert_to_8bit, buffer,

- row_stride, colormap))

- {

- 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 /* PNG_STDIO_SUPPORTED */

-#endif /* SIMPLIFIED_WRITE */

-#endif /* PNG_WRITE_SUPPORTED */

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