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Adding chroma subsampling for mozjpeg

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This commit is contained in:
Jake Archibald
2018-10-29 19:00:29 +00:00
parent e572b853e2
commit 1bdc23364a
7 changed files with 45 additions and 4 deletions
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10
codecs/mozjpeg_enc/mozjpeg_enc.cpp
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@@ -29,6 +29,7 @@ struct MozJpegOptions {
bool trellis_opt_zero;
bool trellis_opt_table;
int trellis_loops;
int chroma_subsample;
};
int version() {
@@ -119,9 +120,6 @@ val encode(std::string image_in, int image_width, int image_height, MozJpegOptio
*/
jpeg_set_defaults(&cinfo);
/* Now you can set any non-default parameters you wish to.
* Here we just illustrate the use of quality (quantization table) scaling:
*/
jpeg_set_colorspace(&cinfo, (J_COLOR_SPACE) opts.color_space);
if (opts.quant_table != -1) {
@@ -147,6 +145,11 @@ val encode(std::string image_in, int image_width, int image_height, MozJpegOptio
set_quality_ratings(&cinfo, (char*) pqual, opts.baseline);
if (opts.chroma_subsample && opts.color_space == JCS_YCbCr) {
cinfo.comp_info[0].h_samp_factor = opts.chroma_subsample;
cinfo.comp_info[0].v_samp_factor = opts.chroma_subsample;
}
if (!opts.baseline && opts.progressive) {
jpeg_simple_progression(&cinfo);
} else {
@@ -209,6 +212,7 @@ EMSCRIPTEN_BINDINGS(my_module) {
.field("trellis_opt_zero", &MozJpegOptions::trellis_opt_zero)
.field("trellis_opt_table", &MozJpegOptions::trellis_opt_table)
.field("trellis_loops", &MozJpegOptions::trellis_loops)
.field("chroma_subsample", &MozJpegOptions::chroma_subsample)
;
function("version", &version);