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
make_mask(const sk_sp<SkSurface> & surface)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:
MaskGenerator(const SkImageInfo & info)29 MaskGenerator(const SkImageInfo& info) : INHERITED(info) {}
30
onGetPixels(const SkImageInfo & info,void * pixels,size_t rowBytes,const Options &)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
__anoneb483b410202() 49 [](SkCanvas*, const SkImageInfo& info) -> sk_sp<SkImage> {
50 return make_mask(SkSurface::MakeRaster(info));
51 },
52
53 // SkImage_Gpu
__anoneb483b410302() 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
__anoneb483b410402() 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