95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
/*
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* Copyright 2016 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm/gm.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkColorSpace.h"
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#include "include/core/SkImage.h"
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#include "include/core/SkImageGenerator.h"
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#include "include/core/SkImageInfo.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkRect.h"
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#include "include/core/SkRefCnt.h"
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#include "include/core/SkSize.h"
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#include "include/core/SkSurface.h"
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#include "include/core/SkTypes.h"
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#include "include/gpu/GrDirectContext.h"
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#include "tools/ToolUtils.h"
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namespace {
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const SkISize kSize = SkISize::Make(100, 100);
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const SkIRect kSubset = SkIRect::MakeLTRB(25, 25, 75, 75);
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const SkRect kDest = SkRect::MakeXYWH(10, 10, 100, 100);
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sk_sp<SkImage> make_mask(const sk_sp<SkSurface>& surface) {
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ToolUtils::draw_checkerboard(surface->getCanvas(), 0x80808080, 0x00000000, 5);
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return surface->makeImageSnapshot();
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}
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class MaskGenerator final : public SkImageGenerator {
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public:
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MaskGenerator(const SkImageInfo& info) : INHERITED(info) {}
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bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes, const Options&)
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override {
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SkImageInfo surfaceInfo = info;
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if (kAlpha_8_SkColorType == info.colorType()) {
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surfaceInfo = surfaceInfo.makeColorSpace(nullptr);
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}
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make_mask(SkSurface::MakeRasterDirect(surfaceInfo, pixels, rowBytes));
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return true;
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}
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private:
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using INHERITED = SkImageGenerator;
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};
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using MakerT = sk_sp<SkImage>(*)(SkCanvas*, const SkImageInfo&);
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const MakerT makers[] = {
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// SkImage_Raster
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[](SkCanvas*, const SkImageInfo& info) -> sk_sp<SkImage> {
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return make_mask(SkSurface::MakeRaster(info));
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},
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// SkImage_Gpu
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[](SkCanvas* c, const SkImageInfo& info) -> sk_sp<SkImage> {
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sk_sp<SkSurface> surface;
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surface = SkSurface::MakeRenderTarget(c->recordingContext(), SkBudgeted::kNo, info);
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return make_mask(surface ? surface : SkSurface::MakeRaster(info));
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},
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// SkImage_Lazy
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[](SkCanvas*, const SkImageInfo& info) -> sk_sp<SkImage> {
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return SkImage::MakeFromGenerator(std::make_unique<MaskGenerator>(info));
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},
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};
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} // namespace
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// Checks whether subset SkImages preserve the original color type (A8 in this case).
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DEF_SIMPLE_GM(imagemasksubset, canvas, 480, 480) {
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SkPaint paint;
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paint.setColor(0xff00ff00);
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const SkImageInfo info = SkImageInfo::MakeA8(kSize.width(), kSize.height());
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for (size_t i = 0; i < SK_ARRAY_COUNT(makers); ++i) {
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sk_sp<SkImage> image = makers[i](canvas, info);
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if (image) {
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canvas->drawImageRect(image, SkRect::Make(kSubset), kDest, SkSamplingOptions(),
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&paint, SkCanvas::kStrict_SrcRectConstraint);
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auto direct = GrAsDirectContext(canvas->recordingContext());
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sk_sp<SkImage> subset = image->makeSubset(kSubset, direct);
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canvas->drawImageRect(subset, kDest.makeOffset(kSize.width() * 1.5f, 0),
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SkSamplingOptions(), &paint);
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}
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canvas->translate(0, kSize.height() * 1.5f);
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}
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}
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