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pnmimagetypes: introduce png-compression-level PRC variable

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kamgha 2017-08-31 13:03:17 +02:00 committed by rdb
parent 1f017997f9
commit f09d767c6e
3 changed files with 15 additions and 2 deletions
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12
panda/src/pnmimagetypes/config_pnmimagetypes.cxx
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@ -81,6 +81,7 @@ ConfigVariableInt img_size
("img-size", 0, ("img-size", 0,
PRC_DESC("If an IMG file without a header is loaded (e.g. img-header-type " PRC_DESC("If an IMG file without a header is loaded (e.g. img-header-type "
"is set to 'none', this specifies the fixed x y size of the image.")); "is set to 'none', this specifies the fixed x y size of the image."));
ConfigVariableInt jpeg_quality ConfigVariableInt jpeg_quality
("jpeg-quality", 95, ("jpeg-quality", 95,
PRC_DESC("Set this to the quality percentage for writing JPEG files. 95 is " PRC_DESC("Set this to the quality percentage for writing JPEG files. 95 is "
@ -88,10 +89,17 @@ ConfigVariableInt jpeg_quality
"significantly better quality, but do lead to significantly greater " "significantly better quality, but do lead to significantly greater "
"size).")); "size)."));
ConfigVariableInt png_compression_level
("png-compression-level", 6,
PRC_DESC("Set this to the desired compression level for writing PNG images. "
"Valid values are 0 (no compression), or 1 (compression, best "
"speed) to 9 (best compression). Default is 6. PNG compression is "
"lossless."));
ConfigVariableBool png_palette ConfigVariableBool png_palette
("png-palette", true, ("png-palette", true,
PRC_DESC("Set this true to allow writing palette-based PNG images when possible.")); PRC_DESC("Set this true to allow writing palette-based PNG images when "
"possible."));
ConfigVariableInt bmp_bpp ConfigVariableInt bmp_bpp
("bmp-bpp", 0, ("bmp-bpp", 0,

1
panda/src/pnmimagetypes/config_pnmimagetypes.h
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@ -57,6 +57,7 @@ extern ConfigVariableBool tga_grayscale;
extern ConfigVariableInt jpeg_quality; extern ConfigVariableInt jpeg_quality;
extern ConfigVariableInt png_compression_level;
extern ConfigVariableBool png_palette; extern ConfigVariableBool png_palette;
extern ConfigVariableInt bmp_bpp; extern ConfigVariableInt bmp_bpp;

4
panda/src/pnmimagetypes/pnmFileTypePNG.cxx
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@ -526,6 +526,10 @@ write_data(xel *array, xelval *alpha_data) {
png_set_write_fn(_png, (void *)this, png_write_data, png_flush_data); png_set_write_fn(_png, (void *)this, png_write_data, png_flush_data);
// The compression level corresponds directly to the compression levels for
// zlib.
png_set_compression_level(_png, png_compression_level);
// First, write the header. // First, write the header.
int true_bit_depth = pm_maxvaltobits(_maxval); int true_bit_depth = pm_maxvaltobits(_maxval);