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Add chroma subsampling options for JPEG output

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Lovell Fuller
2015-02-13 09:41:42 +00:00
parent 0e91ca90d6
commit 1f7e80e581
7 changed files with 69 additions and 5 deletions
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9
src/resize.cc
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@@ -90,6 +90,7 @@ struct ResizeBaton {
int quality;
int compressionLevel;
bool withoutAdaptiveFiltering;
bool withoutChromaSubsampling;
std::string err;
bool withMetadata;
@@ -117,6 +118,7 @@ struct ResizeBaton {
quality(80),
compressionLevel(6),
withoutAdaptiveFiltering(false),
withoutChromaSubsampling(false),
withMetadata(false) {
background[0] = 0.0;
background[1] = 0.0;
@@ -675,7 +677,8 @@ class ResizeWorker : public NanAsyncWorker {
if (baton->output == "__jpeg" || (baton->output == "__input" && inputImageType == ImageType::JPEG)) {
// Write JPEG to buffer
if (vips_jpegsave_buffer(image, &baton->bufferOut, &baton->bufferOutLength, "strip", !baton->withMetadata,
"Q", baton->quality, "optimize_coding", TRUE, "interlace", baton->progressive, NULL)) {
"Q", baton->quality, "optimize_coding", TRUE, "no_subsample", baton->withoutChromaSubsampling,
"interlace", baton->progressive, NULL)) {
return Error(baton, hook);
}
baton->outputFormat = "jpeg";
@@ -741,7 +744,8 @@ class ResizeWorker : public NanAsyncWorker {
if (outputJpeg || (matchInput && inputImageType == ImageType::JPEG)) {
// Write JPEG to file
if (vips_jpegsave(image, baton->output.c_str(), "strip", !baton->withMetadata,
"Q", baton->quality, "optimize_coding", TRUE, "interlace", baton->progressive, NULL)) {
"Q", baton->quality, "optimize_coding", TRUE, "no_subsample", baton->withoutChromaSubsampling,
"interlace", baton->progressive, NULL)) {
return Error(baton, hook);
}
baton->outputFormat = "jpeg";
@@ -992,6 +996,7 @@ NAN_METHOD(resize) {
baton->quality = options->Get(NanNew<String>("quality"))->Int32Value();
baton->compressionLevel = options->Get(NanNew<String>("compressionLevel"))->Int32Value();
baton->withoutAdaptiveFiltering = options->Get(NanNew<String>("withoutAdaptiveFiltering"))->BooleanValue();
baton->withoutChromaSubsampling = options->Get(NanNew<String>("withoutChromaSubsampling"))->BooleanValue();
baton->withMetadata = options->Get(NanNew<String>("withMetadata"))->BooleanValue();
// Output filename or __format for Buffer
baton->output = *String::Utf8Value(options->Get(NanNew<String>("output"))->ToString());