1/* 2 * Copyright 2016 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8#include "gm.h" 9#include "sk_tool_utils.h" 10#include "SkCanvas.h" 11#include "SkImage.h" 12#include "SkImageGenerator.h" 13#include "SkMakeUnique.h" 14#include "SkSurface.h" 15 16namespace { 17 18const SkISize kSize = SkISize::Make(100, 100); 19const SkIRect kSubset = SkIRect::MakeLTRB(25, 25, 75, 75); 20const SkRect kDest = SkRect::MakeXYWH(10, 10, 100, 100); 21 22sk_sp<SkImage> make_mask(const sk_sp<SkSurface>& surface) { 23 sk_tool_utils::draw_checkerboard(surface->getCanvas(), 0x80808080, 0x00000000, 5); 24 return surface->makeImageSnapshot(); 25} 26 27class MaskGenerator final : public SkImageGenerator { 28public: 29 MaskGenerator(const SkImageInfo& info) : INHERITED(info) {} 30 31 bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes, const Options&) 32 override { 33 SkImageInfo surfaceInfo = info; 34 if (kAlpha_8_SkColorType == info.colorType()) { 35 surfaceInfo = surfaceInfo.makeColorSpace(nullptr); 36 } 37 38 make_mask(SkSurface::MakeRasterDirect(surfaceInfo, pixels, rowBytes)); 39 return true; 40 } 41 42private: 43 typedef SkImageGenerator INHERITED; 44}; 45 46using MakerT = sk_sp<SkImage>(*)(SkCanvas*, const SkImageInfo&); 47const MakerT makers[] = { 48 // SkImage_Raster 49 [](SkCanvas*, const SkImageInfo& info) -> sk_sp<SkImage> { 50 return make_mask(SkSurface::MakeRaster(info)); 51 }, 52 53 // SkImage_Gpu 54 [](SkCanvas* c, const SkImageInfo& info) -> sk_sp<SkImage> { 55 sk_sp<SkSurface> surface; 56#if SK_SUPPORT_GPU 57 surface = SkSurface::MakeRenderTarget(c->getGrContext(), SkBudgeted::kNo, info); 58#endif 59 return make_mask(surface ? surface : SkSurface::MakeRaster(info)); 60 }, 61 62 // SkImage_Lazy 63 [](SkCanvas*, const SkImageInfo& info) -> sk_sp<SkImage> { 64 return SkImage::MakeFromGenerator(skstd::make_unique<MaskGenerator>(info)); 65 }, 66}; 67 68} // anonymous ns 69 70// Checks whether subset SkImages preserve the original color type (A8 in this case). 71DEF_SIMPLE_GM(imagemasksubset, canvas, 480, 480) { 72 SkPaint paint; 73 paint.setColor(0xff00ff00); 74 75 const SkImageInfo info = SkImageInfo::MakeA8(kSize.width(), kSize.height()); 76 77 for (size_t i = 0; i < SK_ARRAY_COUNT(makers); ++i) { 78 sk_sp<SkImage> image = makers[i](canvas, info); 79 if (image) { 80 canvas->drawImageRect(image, SkRect::Make(kSubset), kDest, &paint); 81 sk_sp<SkImage> subset = image->makeSubset(kSubset); 82 canvas->drawImageRect(subset, kDest.makeOffset(kSize.width() * 1.5f, 0), &paint); 83 } 84 canvas->translate(0, kSize.height() * 1.5f); 85 } 86} 87