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Add 'fast' blur and Gaussian blur feature #108

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Lovell Fuller
2014-11-10 22:38:13 +00:00
parent df5cf402e3
commit 32d9bc204a
5 changed files with 156 additions and 2 deletions
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28
src/resize.cc
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@@ -50,6 +50,7 @@ struct ResizeBaton {
std::string interpolator;
double background[4];
bool flatten;
int blurRadius;
int sharpenRadius;
double sharpenFlat;
double sharpenJagged;
@@ -76,6 +77,7 @@ struct ResizeBaton {
canvas(CROP),
gravity(0),
flatten(false),
blurRadius(0),
sharpenRadius(0),
sharpenFlat(1.0),
sharpenJagged(2.0),
@@ -510,6 +512,31 @@ class ResizeWorker : public NanAsyncWorker {
image = extractedPost;
}
// Blur
if (baton->blurRadius != 0) {
VipsImage *blurred = vips_image_new();
vips_object_local(hook, blurred);
if (baton->blurRadius == -1) {
// Fast, mild blur
VipsImage *blur = vips_image_new_matrixv(3, 3,
1.0, 1.0, 1.0,
1.0, 1.0, 1.0,
1.0, 1.0, 1.0);
vips_image_set_double(blur, "scale", 9);
vips_object_local(hook, blur);
if (vips_conv(image, &blurred, blur, NULL)) {
return Error(baton, hook);
}
} else {
// Slower, accurate Gaussian blur
if (vips_gaussblur(image, &blurred, baton->blurRadius, NULL)) {
return Error(baton, hook);
}
}
g_object_unref(image);
image = blurred;
}
// Sharpen
if (baton->sharpenRadius != 0) {
VipsImage *sharpened = vips_image_new();
@@ -850,6 +877,7 @@ NAN_METHOD(resize) {
baton->interpolator = *String::Utf8Value(options->Get(NanNew<String>("interpolator"))->ToString());
// Operators
baton->flatten = options->Get(NanNew<String>("flatten"))->BooleanValue();
baton->blurRadius = options->Get(NanNew<String>("blurRadius"))->Int32Value();
baton->sharpenRadius = options->Get(NanNew<String>("sharpenRadius"))->Int32Value();
baton->sharpenFlat = options->Get(NanNew<String>("sharpenFlat"))->NumberValue();
baton->sharpenJagged = options->Get(NanNew<String>("sharpenJagged"))->NumberValue();