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Unified Diff: third_party/libpng/pngwrite.c

Issue 140074: Updates the PNG library to 1.2.37, enables some functionality for O3D (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: Created 11 years, 6 months ago
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Index: third_party/libpng/pngwrite.c
===================================================================
--- third_party/libpng/pngwrite.c (revision 18910)
+++ third_party/libpng/pngwrite.c (working copy)
@@ -1,14 +1,14 @@
/* pngwrite.c - general routines to write a PNG file
*
- * Last changed in libpng 1.2.34 [December 18, 2008]
+ * Last changed in libpng 1.2.37 [June 4, 2009]
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2009 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*/
-/* get internal access to png.h */
+/* Get internal access to png.h */
#define PNG_INTERNAL
#include "png.h"
#ifdef PNG_WRITE_SUPPORTED
@@ -30,7 +30,7 @@
return;
if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
{
- png_write_sig(png_ptr); /* write PNG signature */
+ png_write_sig(png_ptr); /* Write PNG signature */
#if defined(PNG_MNG_FEATURES_SUPPORTED)
if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&(png_ptr->mng_features_permitted))
{
@@ -38,7 +38,7 @@
png_ptr->mng_features_permitted=0;
}
#endif
- /* write IHDR information. */
+ /* 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,
@@ -47,8 +47,9 @@
#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. */
+ /* The rest of these check to see if the valid field has the appropriate
+ * flag set, and if it does, writes the chunk.
+ */
#if defined(PNG_WRITE_gAMA_SUPPORTED)
if (info_ptr->valid & PNG_INFO_gAMA)
{
@@ -97,14 +98,14 @@
#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
if (info_ptr->unknown_chunks_num)
{
- png_unknown_chunk *up;
+ png_unknown_chunk *up;
- png_debug(5, "writing extra chunks");
+ png_debug(5, "writing extra chunks");
- for (up = info_ptr->unknown_chunks;
- up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
- up++)
- {
+ for (up = info_ptr->unknown_chunks;
+ up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
+ up++)
+ {
int keep=png_handle_as_unknown(png_ptr, up->name);
if (keep != PNG_HANDLE_CHUNK_NEVER &&
up->location && !(up->location & PNG_HAVE_PLTE) &&
@@ -116,7 +117,7 @@
png_warning(png_ptr, "Writing zero-length unknown chunk");
png_write_chunk(png_ptr, up->name, up->data, up->size);
}
- }
+ }
}
#endif
png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
@@ -145,20 +146,20 @@
#if defined(PNG_WRITE_tRNS_SUPPORTED)
if (info_ptr->valid & PNG_INFO_tRNS)
+ {
+#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
+ /* Invert the alpha channel (in tRNS) */
+ if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
+ info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
-#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
- /* invert the alpha channel (in tRNS) */
- if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
- info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
- {
- int j;
- for (j=0; j<(int)info_ptr->num_trans; j++)
- info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
- }
+ int j;
+ for (j=0; j<(int)info_ptr->num_trans; j++)
+ info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
+ }
#endif
png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
info_ptr->num_trans, info_ptr->color_type);
- }
+ }
#endif
#if defined(PNG_WRITE_bKGD_SUPPORTED)
if (info_ptr->valid & PNG_INFO_bKGD)
@@ -179,49 +180,56 @@
info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
info_ptr->pcal_units, info_ptr->pcal_params);
#endif
+
+#if defined(PNG_sCAL_SUPPORTED)
+ if (info_ptr->valid & PNG_INFO_sCAL)
#if defined(PNG_WRITE_sCAL_SUPPORTED)
- if (info_ptr->valid & PNG_INFO_sCAL)
#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
-#else
+#else /* !FLOATING_POINT */
#ifdef PNG_FIXED_POINT_SUPPORTED
png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
info_ptr->scal_s_width, info_ptr->scal_s_height);
-#else
+#endif /* FIXED_POINT */
+#endif /* FLOATING_POINT */
+#else /* !WRITE_sCAL */
png_warning(png_ptr,
"png_write_sCAL not supported; sCAL chunk not written.");
-#endif
-#endif
-#endif
+#endif /* WRITE_sCAL */
+#endif /* sCAL */
+
#if defined(PNG_WRITE_pHYs_SUPPORTED)
if (info_ptr->valid & PNG_INFO_pHYs)
png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
-#endif
+#endif /* pHYs */
+
#if defined(PNG_WRITE_tIME_SUPPORTED)
if (info_ptr->valid & PNG_INFO_tIME)
{
png_write_tIME(png_ptr, &(info_ptr->mod_time));
png_ptr->mode |= PNG_WROTE_tIME;
}
-#endif
+#endif /* tIME */
+
#if defined(PNG_WRITE_sPLT_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sPLT)
for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
-#endif
+#endif /* sPLT */
+
#if defined(PNG_WRITE_TEXT_SUPPORTED)
/* Check to see if we need to write text chunks */
for (i = 0; i < info_ptr->num_text; i++)
{
png_debug2(2, "Writing header text chunk %d, type %d", i,
info_ptr->text[i].compression);
- /* an internationalized chunk? */
+ /* An internationalized chunk? */
if (info_ptr->text[i].compression > 0)
{
#if defined(PNG_WRITE_iTXt_SUPPORTED)
- /* write international chunk */
+ /* Write international chunk */
png_write_iTXt(png_ptr,
info_ptr->text[i].compression,
info_ptr->text[i].key,
@@ -238,7 +246,7 @@
else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
{
#if defined(PNG_WRITE_zTXt_SUPPORTED)
- /* write compressed chunk */
+ /* Write compressed chunk */
png_write_zTXt(png_ptr, info_ptr->text[i].key,
info_ptr->text[i].text, 0,
info_ptr->text[i].compression);
@@ -251,18 +259,20 @@
else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
{
#if defined(PNG_WRITE_tEXt_SUPPORTED)
- /* write uncompressed chunk */
+ /* 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
- /* Mark this chunk as written */
- info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
}
}
-#endif
+#endif /* tEXt */
+
#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
if (info_ptr->unknown_chunks_num)
{
@@ -302,29 +312,29 @@
if (!(png_ptr->mode & PNG_HAVE_IDAT))
png_error(png_ptr, "No IDATs written into file");
- /* see if user wants us to write information chunks */
+ /* See if user wants us to write information chunks */
if (info_ptr != NULL)
{
#if defined(PNG_WRITE_TEXT_SUPPORTED)
- int i; /* local index variable */
+ int i; /* Local index variable */
#endif
#if defined(PNG_WRITE_tIME_SUPPORTED)
- /* check to see if user has supplied a time chunk */
+ /* Check to see if user has supplied a time chunk */
if ((info_ptr->valid & PNG_INFO_tIME) &&
!(png_ptr->mode & PNG_WROTE_tIME))
png_write_tIME(png_ptr, &(info_ptr->mod_time));
#endif
#if defined(PNG_WRITE_TEXT_SUPPORTED)
- /* loop through comment chunks */
+ /* 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? */
+ /* An internationalized chunk? */
if (info_ptr->text[i].compression > 0)
{
#if defined(PNG_WRITE_iTXt_SUPPORTED)
- /* write international chunk */
+ /* Write international chunk */
png_write_iTXt(png_ptr,
info_ptr->text[i].compression,
info_ptr->text[i].key,
@@ -340,7 +350,7 @@
else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
{
#if defined(PNG_WRITE_zTXt_SUPPORTED)
- /* write compressed chunk */
+ /* Write compressed chunk */
png_write_zTXt(png_ptr, info_ptr->text[i].key,
info_ptr->text[i].text, 0,
info_ptr->text[i].compression);
@@ -353,7 +363,7 @@
else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
{
#if defined(PNG_WRITE_tEXt_SUPPORTED)
- /* write uncompressed chunk */
+ /* Write uncompressed chunk */
png_write_tEXt(png_ptr, info_ptr->text[i].key,
info_ptr->text[i].text, 0);
#else
@@ -391,7 +401,7 @@
png_ptr->mode |= PNG_AFTER_IDAT;
- /* write end of PNG file */
+ /* 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
@@ -471,7 +481,7 @@
if (png_ptr == NULL)
return (NULL);
- /* added at libpng-1.2.6 */
+ /* Added at libpng-1.2.6 */
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
@@ -542,7 +552,7 @@
}
}
- /* initialize zbuf - compression buffer */
+ /* Initialize zbuf - compression buffer */
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
@@ -636,7 +646,7 @@
{
png_structp png_ptr=*ptr_ptr;
#ifdef PNG_SETJMP_SUPPORTED
- jmp_buf tmp_jmp; /* to save current jump buffer */
+ jmp_buf tmp_jmp; /* To save current jump buffer */
#endif
int i = 0;
@@ -662,7 +672,7 @@
png_debug(1, "in png_write_init_3");
#ifdef PNG_SETJMP_SUPPORTED
- /* save jump buffer and error functions */
+ /* Save jump buffer and error functions */
png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
#endif
@@ -673,24 +683,24 @@
*ptr_ptr = png_ptr;
}
- /* reset all variables to 0 */
+ /* Reset all variables to 0 */
png_memset(png_ptr, 0, png_sizeof(png_struct));
- /* added at libpng-1.2.6 */
+ /* Added at libpng-1.2.6 */
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
#endif
#ifdef PNG_SETJMP_SUPPORTED
- /* restore jump buffer */
+ /* Restore jump buffer */
png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
#endif
png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
png_flush_ptr_NULL);
- /* initialize zbuf - compression buffer */
+ /* Initialize zbuf - compression buffer */
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
@@ -710,15 +720,15 @@
png_write_rows(png_structp png_ptr, png_bytepp row,
png_uint_32 num_rows)
{
- png_uint_32 i; /* row counter */
- png_bytepp rp; /* row pointer */
+ png_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 */
+ /* Loop through the rows */
for (i = 0, rp = row; i < num_rows; i++, rp++)
{
png_write_row(png_ptr, *rp);
@@ -731,25 +741,26 @@
void PNGAPI
png_write_image(png_structp png_ptr, png_bytepp image)
{
- png_uint_32 i; /* row index */
- int pass, num_pass; /* pass variables */
- png_bytepp rp; /* points to current row */
+ png_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");
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
- /* intialize interlace handling. If image is not interlaced,
- this will set pass to 1 */
+ /* Initialize interlace handling. If image is not interlaced,
+ * this will set pass to 1
+ */
num_pass = png_set_interlace_handling(png_ptr);
#else
num_pass = 1;
#endif
- /* loop through passes */
+ /* Loop through passes */
for (pass = 0; pass < num_pass; pass++)
{
- /* loop through image */
+ /* Loop through image */
for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
{
png_write_row(png_ptr, *rp);
@@ -757,7 +768,7 @@
}
}
-/* called by user to write a row of image data */
+/* Called by user to write a row of image data */
void PNGAPI
png_write_row(png_structp png_ptr, png_bytep row)
{
@@ -766,49 +777,49 @@
png_debug2(1, "in png_write_row (row %ld, pass %d)",
png_ptr->row_number, png_ptr->pass);
- /* initialize transformations and other stuff if first time */
+ /* Initialize transformations and other stuff if first time */
if (png_ptr->row_number == 0 && png_ptr->pass == 0)
{
- /* make sure we wrote the header info */
- if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
- png_error(png_ptr,
- "png_write_info was never called before png_write_row.");
+ /* 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 */
+ /* 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.");
+ 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.");
+ 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.");
+ 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.");
+ 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.");
+ 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.");
+ 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.");
+ if (png_ptr->transformations & PNG_SWAP_BYTES)
+ png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");
#endif
png_write_start_row(png_ptr);
}
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
- /* if interlaced and not interested in row, return */
+ /* If interlaced and not interested in row, return */
if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
{
switch (png_ptr->pass)
@@ -866,7 +877,7 @@
}
#endif
- /* set up row info for transformations */
+ /* Set up row info for transformations */
png_ptr->row_info.color_type = png_ptr->color_type;
png_ptr->row_info.width = png_ptr->usr_width;
png_ptr->row_info.channels = png_ptr->usr_channels;
@@ -889,13 +900,13 @@
png_ptr->row_info.rowbytes);
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
- /* handle interlacing */
+ /* Handle interlacing */
if (png_ptr->interlaced && png_ptr->pass < 6 &&
(png_ptr->transformations & PNG_INTERLACE))
{
png_do_write_interlace(&(png_ptr->row_info),
png_ptr->row_buf + 1, png_ptr->pass);
- /* this should always get caught above, but still ... */
+ /* This should always get caught above, but still ... */
if (!(png_ptr->row_info.width))
{
png_write_finish_row(png_ptr);
@@ -904,7 +915,7 @@
}
#endif
- /* handle other transformations */
+ /* Handle other transformations */
if (png_ptr->transformations)
png_do_write_transformations(png_ptr);
@@ -944,7 +955,7 @@
png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
}
-/* flush the current output buffers now */
+/* Flush the current output buffers now */
void PNGAPI
png_write_flush(png_structp png_ptr)
{
@@ -955,17 +966,17 @@
return;
/* We have already written out all of the data */
if (png_ptr->row_number >= png_ptr->num_rows)
- return;
+ return;
do
{
int ret;
- /* compress the data */
+ /* Compress the data */
ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);
wrote_IDAT = 0;
- /* check for compression errors */
+ /* Check for compression errors */
if (ret != Z_OK)
{
if (png_ptr->zstream.msg != NULL)
@@ -976,7 +987,7 @@
if (!(png_ptr->zstream.avail_out))
{
- /* write the IDAT and reset the zlib output buffer */
+ /* Write the IDAT and reset the zlib output buffer */
png_write_IDAT(png_ptr, png_ptr->zbuf,
png_ptr->zbuf_size);
png_ptr->zstream.next_out = png_ptr->zbuf;
@@ -988,7 +999,7 @@
/* If there is any data left to be output, write it into a new IDAT */
if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
{
- /* write the IDAT and reset the zlib output buffer */
+ /* Write the IDAT and reset the zlib output buffer */
png_write_IDAT(png_ptr, png_ptr->zbuf,
png_ptr->zbuf_size - png_ptr->zstream.avail_out);
png_ptr->zstream.next_out = png_ptr->zbuf;
@@ -999,7 +1010,7 @@
}
#endif /* PNG_WRITE_FLUSH_SUPPORTED */
-/* free all memory used by the write */
+/* Free all memory used by the write */
void PNGAPI
png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
{
@@ -1075,7 +1086,7 @@
png_write_destroy(png_structp png_ptr)
{
#ifdef PNG_SETJMP_SUPPORTED
- jmp_buf tmp_jmp; /* save jump buffer */
+ jmp_buf tmp_jmp; /* Save jump buffer */
#endif
png_error_ptr error_fn;
png_error_ptr warning_fn;
@@ -1085,10 +1096,10 @@
#endif
png_debug(1, "in png_write_destroy");
- /* free any memory zlib uses */
+ /* Free any memory zlib uses */
deflateEnd(&png_ptr->zstream);
- /* free our memory. png_free checks NULL for us. */
+ /* Free our memory. png_free checks NULL for us. */
png_free(png_ptr, png_ptr->zbuf);
png_free(png_ptr, png_ptr->row_buf);
#ifndef PNG_NO_WRITE_FILTER
@@ -1112,7 +1123,7 @@
#endif
#ifdef PNG_SETJMP_SUPPORTED
- /* reset structure */
+ /* Reset structure */
png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
#endif
@@ -1415,7 +1426,7 @@
else if (window_bits < 8)
png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
#ifndef WBITS_8_OK
- /* avoid libpng bug with 256-byte windows */
+ /* Avoid libpng bug with 256-byte windows */
if (window_bits == 8)
{
png_warning(png_ptr, "Compression window is being reset to 512");
@@ -1468,9 +1479,9 @@
if (png_ptr == NULL || info_ptr == NULL)
return;
#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
- /* invert the alpha channel from opacity to transparency */
+ /* Invert the alpha channel from opacity to transparency */
if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
- png_set_invert_alpha(png_ptr);
+ png_set_invert_alpha(png_ptr);
#endif
/* Write the file header information. */
@@ -1479,9 +1490,9 @@
/* ------ these transformations don't touch the info structure ------- */
#if defined(PNG_WRITE_INVERT_SUPPORTED)
- /* invert monochrome pixels */
+ /* Invert monochrome pixels */
if (transforms & PNG_TRANSFORM_INVERT_MONO)
- png_set_invert_mono(png_ptr);
+ png_set_invert_mono(png_ptr);
#endif
#if defined(PNG_WRITE_SHIFT_SUPPORTED)
@@ -1490,57 +1501,57 @@
*/
if ((transforms & PNG_TRANSFORM_SHIFT)
&& (info_ptr->valid & PNG_INFO_sBIT))
- png_set_shift(png_ptr, &info_ptr->sig_bit);
+ png_set_shift(png_ptr, &info_ptr->sig_bit);
#endif
#if defined(PNG_WRITE_PACK_SUPPORTED)
- /* pack pixels into bytes */
+ /* Pack pixels into bytes */
if (transforms & PNG_TRANSFORM_PACKING)
png_set_packing(png_ptr);
#endif
#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
- /* swap location of alpha bytes from ARGB to RGBA */
+ /* Swap location of alpha bytes from ARGB to RGBA */
if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
- png_set_swap_alpha(png_ptr);
+ png_set_swap_alpha(png_ptr);
#endif
#if defined(PNG_WRITE_FILLER_SUPPORTED)
/* Pack XRGB/RGBX/ARGB/RGBA into * RGB (4 channels -> 3 channels) */
- if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER)
+ if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER)
png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
- else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE)
+ else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE)
png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
#endif
#if defined(PNG_WRITE_BGR_SUPPORTED)
- /* flip BGR pixels to RGB */
+ /* Flip BGR pixels to RGB */
if (transforms & PNG_TRANSFORM_BGR)
- png_set_bgr(png_ptr);
+ png_set_bgr(png_ptr);
#endif
#if defined(PNG_WRITE_SWAP_SUPPORTED)
- /* swap bytes of 16-bit files to most significant byte first */
+ /* Swap bytes of 16-bit files to most significant byte first */
if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
- png_set_swap(png_ptr);
+ png_set_swap(png_ptr);
#endif
#if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
- /* swap bits of 1, 2, 4 bit packed pixel formats */
+ /* Swap bits of 1, 2, 4 bit packed pixel formats */
if (transforms & PNG_TRANSFORM_PACKSWAP)
- png_set_packswap(png_ptr);
+ png_set_packswap(png_ptr);
#endif
/* ----------------------- end of transformations ------------------- */
- /* write the bits */
+ /* Write the bits */
if (info_ptr->valid & PNG_INFO_IDAT)
png_write_image(png_ptr, info_ptr->row_pointers);
/* It is REQUIRED to call this to finish writing the rest of the file */
png_write_end(png_ptr, info_ptr);
- transforms = transforms; /* quiet compiler warnings */
+ transforms = transforms; /* Quiet compiler warnings */
params = params;
}
#endif
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