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/gm.h"
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkColorSpace.h"
11 #include "include/core/SkImage.h"
12 #include "include/core/SkImageGenerator.h"
13 #include "include/core/SkImageInfo.h"
14 #include "include/core/SkPaint.h"
15 #include "include/core/SkRect.h"
16 #include "include/core/SkRefCnt.h"
17 #include "include/core/SkSize.h"
18 #include "include/core/SkSurface.h"
19 #include "include/core/SkTypes.h"
20 #include "tools/ToolUtils.h"
21
22 namespace {
23
24 const SkISize kSize = SkISize::Make(100, 100);
25 const SkIRect kSubset = SkIRect::MakeLTRB(25, 25, 75, 75);
26 const SkRect kDest = SkRect::MakeXYWH(10, 10, 100, 100);
27
make_mask(const sk_sp<SkSurface> & surface)28 sk_sp<SkImage> make_mask(const sk_sp<SkSurface>& surface) {
29 ToolUtils::draw_checkerboard(surface->getCanvas(), 0x80808080, 0x00000000, 5);
30 return surface->makeImageSnapshot();
31 }
32
33 class MaskGenerator final : public SkImageGenerator {
34 public:
MaskGenerator(const SkImageInfo & info)35 MaskGenerator(const SkImageInfo& info) : INHERITED(info) {}
36
onGetPixels(const SkImageInfo & info,void * pixels,size_t rowBytes,const Options &)37 bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes, const Options&)
38 override {
39 SkImageInfo surfaceInfo = info;
40 if (kAlpha_8_SkColorType == info.colorType()) {
41 surfaceInfo = surfaceInfo.makeColorSpace(nullptr);
42 }
43
44 make_mask(SkSurface::MakeRasterDirect(surfaceInfo, pixels, rowBytes));
45 return true;
46 }
47
48 private:
49 typedef SkImageGenerator INHERITED;
50 };
51
52 using MakerT = sk_sp<SkImage>(*)(SkCanvas*, const SkImageInfo&);
53 const MakerT makers[] = {
54 // SkImage_Raster
__anon85d5964c0202() 55 [](SkCanvas*, const SkImageInfo& info) -> sk_sp<SkImage> {
56 return make_mask(SkSurface::MakeRaster(info));
57 },
58
59 // SkImage_Gpu
__anon85d5964c0302() 60 [](SkCanvas* c, const SkImageInfo& info) -> sk_sp<SkImage> {
61 sk_sp<SkSurface> surface;
62 surface = SkSurface::MakeRenderTarget(c->getGrContext(), SkBudgeted::kNo, info);
63 return make_mask(surface ? surface : SkSurface::MakeRaster(info));
64 },
65
66 // SkImage_Lazy
__anon85d5964c0402() 67 [](SkCanvas*, const SkImageInfo& info) -> sk_sp<SkImage> {
68 return SkImage::MakeFromGenerator(std::make_unique<MaskGenerator>(info));
69 },
70 };
71
72 } // anonymous ns
73
74 // Checks whether subset SkImages preserve the original color type (A8 in this case).
75 DEF_SIMPLE_GM(imagemasksubset, canvas, 480, 480) {
76 SkPaint paint;
77 paint.setColor(0xff00ff00);
78
79 const SkImageInfo info = SkImageInfo::MakeA8(kSize.width(), kSize.height());
80
81 for (size_t i = 0; i < SK_ARRAY_COUNT(makers); ++i) {
82 sk_sp<SkImage> image = makers[i](canvas, info);
83 if (image) {
84 canvas->drawImageRect(image, SkRect::Make(kSubset), kDest, &paint);
85 sk_sp<SkImage> subset = image->makeSubset(kSubset);
86 canvas->drawImageRect(subset, kDest.makeOffset(kSize.width() * 1.5f, 0), &paint);
87 }
88 canvas->translate(0, kSize.height() * 1.5f);
89 }
90 }
91