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[libpng16] Added PNG_IMAGE_FLAG_FAST for the benefit of applications that
store intermediate files, or intermediate in-memory data, while processing image data with the simplified API. The option makes the files larger but faster to write and read. pngstest now uses this by default; this can be disabled with the --slow option.
This commit is contained in:
John Bowler
Glenn Randers-Pehrson
parent
1c25b9b06b
commit
dee7577330
9
ANNOUNCE
9
ANNOUNCE
@ -1,5 +1,5 @@
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Libpng 1.6.0beta15 - February 29, 2012
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Libpng 1.6.0beta15 - March 2, 2012
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This is not intended to be a public release. It will be replaced
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within a few weeks by a public version or by another test version.
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@ -234,12 +234,17 @@ Version 1.6.0beta14 [February 27, 2012]
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Added information about the new limits in the manual.
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Updated Makefile.in
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Version 1.6.0beta15 [February 29, 2012]
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Version 1.6.0beta15 [March 2, 2012]
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Removed unused "current_text" members of png_struct and the png_free()
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of png_ptr->current_text from pngread.c
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Rewrote pngstest.c for substantial speed improvement.
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Fixed transparent pixel and 16-bit rgb tests in pngstest and removed a
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spurious check in pngwrite.c
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Added PNG_IMAGE_FLAG_FAST for the benefit of applications that store
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intermediate files, or intermediate in-memory data, while processing
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image data with the simplified API. The option makes the files larger
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but faster to write and read. pngstest now uses this by default; this
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can be disabled with the --slow option.
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Send comments/corrections/commendations to png-mng-implement at lists.sf.net
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(subscription required; visit
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7
CHANGES
7
CHANGES
@ -3986,12 +3986,17 @@ Version 1.6.0beta14 [February 27, 2012]
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Added information about the new limits in the manual.
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Updated Makefile.in
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Version 1.6.0beta15 [February 29, 2012]
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Version 1.6.0beta15 [March 2, 2012]
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Removed unused "current_text" members of png_struct and the png_free()
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of png_ptr->current_text from pngread.c
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Rewrote pngstest.c for substantial speed improvement.
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Fixed transparent pixel and 16-bit rgb tests in pngstest and removed a
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spurious check in pngwrite.c
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Added PNG_IMAGE_FLAG_FAST for the benefit of applications that store
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intermediate files, or intermediate in-memory data, while processing
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image data with the simplified API. The option makes the files larger
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but faster to write and read. pngstest now uses this by default; this
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can be disabled with the --slow option.
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Send comments/corrections/commendations to png-mng-implement at lists.sf.net
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(subscription required; visit
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@ -304,6 +304,7 @@ compare_16bit(int v1, int v2, int error_limit, int multiple_algorithms)
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#define KEEP_TMPFILES 16 /* else delete temporary files */
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#define KEEP_GOING 32
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#define ACCUMULATE 64
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#define FAST_WRITE 128
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static void
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print_opts(png_uint_32 opts)
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@ -1932,7 +1933,7 @@ static png_uint_16 gpc_error[16/*in*/][16/*out*/][4/*a*/] =
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{ 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 },
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{ 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }
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}, { /* input: sRGB-rgb */
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{ 0, 0, 17, 0 }, { 0, 0, 17, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 },
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{ 0, 0, 19, 0 }, { 0, 0, 19, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 },
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{ 0, 0, 863, 0 }, { 0, 0, 863, 0 }, { 0, 0, 811, 0 }, { 0, 0, 811, 0 },
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{ 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 },
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{ 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }
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@ -2010,7 +2011,7 @@ static png_uint_16 gpc_error_via_linear[16][4/*out*/][4] =
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}, { /* input: sRGB-gray+alpha */
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{ 0, 6, 3, 0 }, { 0, 53, 3, 0 }, { 0, 6, 3, 0 }, { 0, 53, 3, 0 }
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}, { /* input: sRGB-rgb */
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{ 0, 0, 17, 0 }, { 0, 0, 17, 0 }, { 0, 0, 14, 0 }, { 0, 0, 14, 0 }
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{ 0, 0, 19, 0 }, { 0, 0, 19, 0 }, { 0, 0, 15, 0 }, { 0, 0, 15, 0 }
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}, { /* input: sRGB-rgb+alpha */
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{ 0, 8, 10, 0 }, { 0, 13, 10, 0 }, { 0, 12, 8, 0 }, { 0, 53, 8, 0 }
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}, { /* input: linear-gray */
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@ -3083,6 +3084,9 @@ read_one_file(Image *image)
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static int
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write_one_file(Image *output, Image *image, int convert_to_8bit)
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{
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if (image->opts & FAST_WRITE)
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image->image.flags |= PNG_IMAGE_FLAG_FAST;
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if (image->opts & USE_STDIO)
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{
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FILE *f = tmpfile();
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@ -3303,7 +3307,7 @@ testimage(Image *image, png_uint_32 opts, format_list *pf)
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int
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main(int argc, char **argv)
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{
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png_uint_32 opts = 0;
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png_uint_32 opts = FAST_WRITE;
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format_list formats;
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const char *touch = NULL;
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int log_pass = 0;
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@ -3347,6 +3351,10 @@ main(int argc, char **argv)
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opts &= ~KEEP_TMPFILES;
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else if (strcmp(arg, "--keep-going") == 0)
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opts |= KEEP_GOING;
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else if (strcmp(arg, "--fast") == 0)
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opts |= FAST_WRITE;
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else if (strcmp(arg, "--slow") == 0)
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opts &= ~FAST_WRITE;
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else if (strcmp(arg, "--accumulate") == 0)
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opts |= ACCUMULATE;
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else if (strcmp(arg, "--redundant") == 0)
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21
png.h
21
png.h
@ -1,7 +1,7 @@
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/* png.h - header file for PNG reference library
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*
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* libpng version 1.6.0beta15 - February 27, 2012
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* libpng version 1.6.0beta15 - March 2, 2012
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* Copyright (c) 1998-2012 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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@ -11,7 +11,7 @@
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* Authors and maintainers:
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* libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
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* libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
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* libpng versions 0.97, January 1998, through 1.6.0beta15 - February 27, 2012: Glenn
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* libpng versions 0.97, January 1998, through 1.6.0beta15 - March 2, 2012: Glenn
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* See also "Contributing Authors", below.
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*
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* Note about libpng version numbers:
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@ -198,7 +198,7 @@
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*
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* This code is released under the libpng license.
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*
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* libpng versions 1.2.6, August 15, 2004, through 1.6.0beta15, February 27, 2012, are
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* libpng versions 1.2.6, August 15, 2004, through 1.6.0beta15, March 2, 2012, are
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* Copyright (c) 2004, 2006-2012 Glenn Randers-Pehrson, and are
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* distributed according to the same disclaimer and license as libpng-1.2.5
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* with the following individual added to the list of Contributing Authors:
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@ -310,7 +310,7 @@
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* Y2K compliance in libpng:
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* =========================
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*
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* February 27, 2012
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* March 2, 2012
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*
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* Since the PNG Development group is an ad-hoc body, we can't make
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* an official declaration.
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@ -376,7 +376,7 @@
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/* Version information for png.h - this should match the version in png.c */
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#define PNG_LIBPNG_VER_STRING "1.6.0beta15"
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#define PNG_HEADER_VERSION_STRING \
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" libpng version 1.6.0beta15 - February 27, 2012\n"
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" libpng version 1.6.0beta15 - March 2, 2012\n"
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#define PNG_LIBPNG_VER_SONUM 16
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#define PNG_LIBPNG_VER_DLLNUM 16
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@ -2943,6 +2943,17 @@ typedef struct
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* correspond to the red, green and blue end-points defined by sRGB.
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*/
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#define PNG_IMAGE_FLAG_FAST 0x02
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/* On write emphasise speed over compression; the resultant PNG file will be
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* larger but will be produced significantly faster, particular for large
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* images. Do not use this option for images which will be distributed, only
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* used it when producing intermediate files that will be read back in
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* repeatedly. For a typical 24-bit image the option will double the read
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* speed at the cost of increasing the image size by 25%, however for many
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* more compressible images the PNG file can be 10 times larger with only a
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* slight speed gain.
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*/
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#ifdef PNG_SIMPLIFIED_READ_SUPPORTED
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/* READ APIs
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* ---------
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21
pngwrite.c
21
pngwrite.c
@ -731,6 +731,15 @@ png_write_row(png_structrp png_ptr, png_const_bytep row)
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}
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#endif
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#if 0 /* To do: implement png_do_check_palette_indexes() */
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/* Check for out-of-range palette index */
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if (png_ptr->num_palette < (1 << png_ptr->bit_depth))
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png_do_check_palette_indexes(&row_info, png_ptr->row_buf + 1,
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png_ptr->num_palette_max);
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if (png_ptr->num_palette_max > num_palette + 1)
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png_warning(png_ptr, "Palette index exceeded num_palette");
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#endif
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/* Find a filter if necessary, filter the row and write it out. */
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png_write_find_filter(png_ptr, &row_info);
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@ -2109,6 +2118,18 @@ png_image_write_main(png_voidp argument)
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display->row_bytes = row_bytes;
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}
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/* Apply 'fast' options if the flag is set. */
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if ((image->flags & PNG_IMAGE_FLAG_FAST) != 0)
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{
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png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_NO_FILTERS);
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/* NOTE: determined by experiment using pngstest, this reflects some
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* balance between the time to write the image once and the time to read
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* it about 50 times. The speed-up in pngstest was about 10-20% of the
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* total (user) time on a heavily loaded system.
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*/
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png_set_compression_level(png_ptr, 3);
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}
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/* Check for the cases that currently require a pre-transform on the row
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* before it is written. This only applies when the input is 16-bit and
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* either there is an alpha channel or it is converted to 8-bit.
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