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