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Expose libjpeg extension param features

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Trellis quantisation, overshoot deringing and scan optimisation
This commit is contained in:
Lovell Fuller
2015-04-14 11:33:25 +01:00
parent be39297f3b
commit f6fd45cc90
4 changed files with 206 additions and 24 deletions
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19
src/resize.cc
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@@ -95,6 +95,9 @@ struct ResizeBaton {
int compressionLevel;
bool withoutAdaptiveFiltering;
bool withoutChromaSubsampling;
bool trellisQuantisation;
bool overshootDeringing;
bool optimiseScans;
std::string err;
bool withMetadata;
int tileSize;
@@ -126,6 +129,9 @@ struct ResizeBaton {
compressionLevel(6),
withoutAdaptiveFiltering(false),
withoutChromaSubsampling(false),
trellisQuantisation(false),
overshootDeringing(false),
optimiseScans(false),
withMetadata(false),
tileSize(256),
tileOverlap(0) {
@@ -813,6 +819,11 @@ class ResizeWorker : public NanAsyncWorker {
// Write JPEG to buffer
if (vips_jpegsave_buffer(image, &baton->bufferOut, &baton->bufferOutLength, "strip", !baton->withMetadata,
"Q", baton->quality, "optimize_coding", TRUE, "no_subsample", baton->withoutChromaSubsampling,
#if (VIPS_MAJOR_VERSION >= 8)
"trellis_quant", baton->trellisQuantisation,
"overshoot_deringing", baton->overshootDeringing,
"optimize_scans", baton->optimiseScans,
#endif
"interlace", baton->progressive, NULL)) {
return Error();
}
@@ -881,6 +892,11 @@ class ResizeWorker : public NanAsyncWorker {
// Write JPEG to file
if (vips_jpegsave(image, baton->output.c_str(), "strip", !baton->withMetadata,
"Q", baton->quality, "optimize_coding", TRUE, "no_subsample", baton->withoutChromaSubsampling,
#if (VIPS_MAJOR_VERSION >= 8)
"trellis_quant", baton->trellisQuantisation,
"overshoot_deringing", baton->overshootDeringing,
"optimize_scans", baton->optimiseScans,
#endif
"interlace", baton->progressive, NULL)) {
return Error();
}
@@ -1175,6 +1191,9 @@ NAN_METHOD(resize) {
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->trellisQuantisation = options->Get(NanNew<String>("trellisQuantisation"))->BooleanValue();
baton->overshootDeringing = options->Get(NanNew<String>("overshootDeringing"))->BooleanValue();
baton->optimiseScans = options->Get(NanNew<String>("optimiseScans"))->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());