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      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 
     16 namespace {
     17 
     18 const SkISize   kSize = SkISize::Make(100, 100);
     19 const SkIRect kSubset = SkIRect::MakeLTRB(25, 25, 75, 75);
     20 const SkRect    kDest = SkRect::MakeXYWH(10, 10, 100, 100);
     21 
     22 sk_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 
     27 class MaskGenerator final : public SkImageGenerator {
     28 public:
     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 
     42 private:
     43     typedef SkImageGenerator INHERITED;
     44 };
     45 
     46 using MakerT = sk_sp<SkImage>(*)(SkCanvas*, const SkImageInfo&);
     47 const 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         surface = SkSurface::MakeRenderTarget(c->getGrContext(), SkBudgeted::kNo, info);
     57         return make_mask(surface ? surface : SkSurface::MakeRaster(info));
     58     },
     59 
     60     // SkImage_Lazy
     61     [](SkCanvas*, const SkImageInfo& info) -> sk_sp<SkImage> {
     62         return SkImage::MakeFromGenerator(skstd::make_unique<MaskGenerator>(info));
     63     },
     64 };
     65 
     66 } // anonymous ns
     67 
     68 // Checks whether subset SkImages preserve the original color type (A8 in this case).
     69 DEF_SIMPLE_GM(imagemasksubset, canvas, 480, 480) {
     70     SkPaint paint;
     71     paint.setColor(0xff00ff00);
     72 
     73     const SkImageInfo info = SkImageInfo::MakeA8(kSize.width(), kSize.height());
     74 
     75     for (size_t i = 0; i < SK_ARRAY_COUNT(makers); ++i) {
     76         sk_sp<SkImage> image = makers[i](canvas, info);
     77         if (image) {
     78             canvas->drawImageRect(image, SkRect::Make(kSubset), kDest, &paint);
     79             sk_sp<SkImage> subset = image->makeSubset(kSubset);
     80             canvas->drawImageRect(subset, kDest.makeOffset(kSize.width() * 1.5f, 0), &paint);
     81         }
     82         canvas->translate(0, kSize.height() * 1.5f);
     83     }
     84 }
     85