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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkCanvas.h"
#include "SkBlurImageFilter.h"
#include "SkColorFilterImageFilter.h"
#include "SkModeColorFilter.h"
#include "SkMorphologyImageFilter.h"
#include "SkOffsetImageFilter.h"
#include "SkSurface.h"
static sk_sp<SkImage> make_image(SkCanvas* rootCanvas) {
SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
auto surface(rootCanvas->makeSurface(info));
if (!surface) {
surface = SkSurface::MakeRaster(info);
}
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(SK_ColorRED);
surface->getCanvas()->drawCircle(50, 50, 50, paint);
return surface->makeImageSnapshot();
}
typedef sk_sp<SkImageFilter> (*ImageFilterFactory)();
// +[]{...} did not work on windows (VS)
// (ImageFilterFactory)[]{...} did not work on linux (gcc)
// hence this cast function
template <typename T> ImageFilterFactory IFCCast(T arg) { return arg; }
// Show the effect of localmatriximagefilter with various matrices, on various filters
class LocalMatrixImageFilterGM : public skiagm::GM {
public:
LocalMatrixImageFilterGM() {}
protected:
SkString onShortName() override {
return SkString("localmatriximagefilter");
}
SkISize onISize() override {
return SkISize::Make(640, 640);
}
static void show_image(SkCanvas* canvas, SkImage* image, sk_sp<SkImageFilter> filter) {
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
SkRect r = SkRect::MakeIWH(image->width(), image->height()).makeOutset(SK_ScalarHalf,
SK_ScalarHalf);
canvas->drawRect(r, paint);
paint.setStyle(SkPaint::kFill_Style);
paint.setImageFilter(filter);
canvas->drawImage(image, 0, 0, &paint);
}
void onDraw(SkCanvas* canvas) override {
sk_sp<SkImage> image0(make_image(canvas));
const ImageFilterFactory factories[] = {
IFCCast([]{ return SkBlurImageFilter::Make(8, 8, nullptr); }),
IFCCast([]{ return SkDilateImageFilter::Make(8, 8, nullptr); }),
IFCCast([]{ return SkErodeImageFilter::Make(8, 8, nullptr); }),
IFCCast([]{ return SkOffsetImageFilter::Make(8, 8, nullptr); }),
};
const SkMatrix matrices[] = {
SkMatrix::MakeScale(SK_ScalarHalf, SK_ScalarHalf),
SkMatrix::MakeScale(2, 2),
SkMatrix::MakeTrans(10, 10)
};
const SkScalar spacer = image0->width() * 3.0f / 2;
canvas->translate(40, 40);
for (auto&& factory : factories) {
sk_sp<SkImageFilter> filter(factory());
canvas->save();
show_image(canvas, image0.get(), filter);
for (const auto& matrix : matrices) {
sk_sp<SkImageFilter> localFilter(filter->makeWithLocalMatrix(matrix));
canvas->translate(spacer, 0);
show_image(canvas, image0.get(), std::move(localFilter));
}
canvas->restore();
canvas->translate(0, spacer);
}
}
private:
typedef GM INHERITED;
};
DEF_GM( return new LocalMatrixImageFilterGM; )
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