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Add support for greyscale conversion #43

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Lovell Fuller
2014-09-16 11:22:26 +01:00
parent d41321254a
commit 1c79d6fb5d
5 changed files with 84 additions and 8 deletions
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12
src/sharp.cc
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@@ -28,6 +28,7 @@ struct resize_baton {
bool sharpen;
std::string interpolator;
double gamma;
bool greyscale;
bool progressive;
bool without_enlargement;
VipsAccess access_method;
@@ -483,6 +484,16 @@ class ResizeWorker : public NanAsyncWorker {
shrunk_on_load = gamma_encoded;
}
// Convert to greyscale (linear, therefore after gamma encoding, if any)
if (baton->greyscale) {
VipsImage *greyscale = vips_image_new();
if (vips_colourspace(shrunk_on_load, &greyscale, VIPS_INTERPRETATION_B_W, NULL)) {
return resize_error(baton, shrunk_on_load);
}
g_object_unref(shrunk_on_load);
shrunk_on_load = greyscale;
}
VipsImage *shrunk = vips_image_new();
if (shrink > 1) {
// Use vips_shrink with the integral reduction
@@ -750,6 +761,7 @@ NAN_METHOD(resize) {
baton->sharpen = options->Get(NanNew<String>("sharpen"))->BooleanValue();
baton->interpolator = *String::Utf8Value(options->Get(NanNew<String>("interpolator"))->ToString());
baton->gamma = options->Get(NanNew<String>("gamma"))->NumberValue();
baton->greyscale = options->Get(NanNew<String>("greyscale"))->BooleanValue();
baton->progressive = options->Get(NanNew<String>("progressive"))->BooleanValue();
baton->without_enlargement = options->Get(NanNew<String>("withoutEnlargement"))->BooleanValue();
baton->access_method = options->Get(NanNew<String>("sequentialRead"))->BooleanValue() ? VIPS_ACCESS_SEQUENTIAL : VIPS_ACCESS_RANDOM;