85 lines
2.6 KiB
C++
85 lines
2.6 KiB
C++
|
/*
|
||
|
|
* Copyright 2016 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 "SkImage.h"
|
||
|
|
#include "SkImageGenerator.h"
|
||
|
|
#include "SkSurface.h"
|
||
|
|
#include "sk_tool_utils.h"
|
||
|
|
|
||
|
|
namespace {
|
||
|
|
|
||
|
|
const SkISize kSize = SkISize::Make(100, 100);
|
||
|
|
const SkIRect kSubset = SkIRect::MakeLTRB(25, 25, 75, 75);
|
||
|
|
const SkRect kDest = SkRect::MakeXYWH(10, 10, 100, 100);
|
||
|
|
|
||
|
|
sk_sp<SkImage> make_mask(const sk_sp<SkSurface>& surface) {
|
||
|
|
sk_tool_utils::draw_checkerboard(surface->getCanvas(), 0x80808080, 0x00000000, 5);
|
||
|
|
return surface->makeImageSnapshot();
|
||
|
|
}
|
||
|
|
|
||
|
|
class MaskGenerator final : public SkImageGenerator {
|
||
|
|
public:
|
||
|
|
MaskGenerator(const SkImageInfo& info) : INHERITED(info) {}
|
||
|
|
|
||
|
|
bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes, SkPMColor*,
|
||
|
|
int*) override {
|
||
|
|
if (info.colorType() == kIndex_8_SkColorType) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
make_mask(SkSurface::MakeRasterDirect(info, pixels, rowBytes));
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
typedef SkImageGenerator INHERITED;
|
||
|
|
};
|
||
|
|
|
||
|
|
using MakerT = sk_sp<SkImage>(*)(SkCanvas*, const SkImageInfo&);
|
||
|
|
const MakerT makers[] = {
|
||
|
|
// SkImage_Raster
|
||
|
|
[](SkCanvas*, const SkImageInfo& info) -> sk_sp<SkImage> {
|
||
|
|
return make_mask(SkSurface::MakeRaster(info));
|
||
|
|
},
|
||
|
|
|
||
|
|
// SkImage_Gpu
|
||
|
|
[](SkCanvas* c, const SkImageInfo& info) -> sk_sp<SkImage> {
|
||
|
|
sk_sp<SkSurface> surface;
|
||
|
|
#if SK_SUPPORT_GPU
|
||
|
|
surface = SkSurface::MakeRenderTarget(c->getGrContext(), SkBudgeted::kNo, info);
|
||
|
|
#endif
|
||
|
|
return make_mask(surface ? surface : SkSurface::MakeRaster(info));
|
||
|
|
},
|
||
|
|
|
||
|
|
// SkImage_Generator
|
||
|
|
[](SkCanvas*, const SkImageInfo& info) -> sk_sp<SkImage> {
|
||
|
|
return SkImage::MakeFromGenerator(new MaskGenerator(info));
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
} // anonymous ns
|
||
|
|
|
||
|
|
// Checks whether subset SkImages preserve the original color type (A8 in this case).
|
||
|
|
DEF_SIMPLE_GM(imagemasksubset, canvas, 480, 480) {
|
||
|
|
SkPaint paint;
|
||
|
|
paint.setColor(0xff00ff00);
|
||
|
|
|
||
|
|
const SkImageInfo info = SkImageInfo::MakeA8(kSize.width(), kSize.height());
|
||
|
|
|
||
|
|
for (size_t i = 0; i < SK_ARRAY_COUNT(makers); ++i) {
|
||
|
|
sk_sp<SkImage> image = makers[i](canvas, info);
|
||
|
|
if (image) {
|
||
|
|
canvas->drawImageRect(image, SkRect::Make(kSubset), kDest, &paint);
|
||
|
|
sk_sp<SkImage> subset = image->makeSubset(kSubset);
|
||
|
|
canvas->drawImageRect(subset, kDest.makeOffset(kSize.width() * 1.5f, 0), &paint);
|
||
|
|
}
|
||
|
|
canvas->translate(0, kSize.height() * 1.5f);
|
||
|
|
}
|
||
|
|
}
|