1/*
2 * Copyright 2015 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 "SkImage.h"
10#include "SkImageSource.h"
11#include "SkSurface.h"
12
13namespace skiagm {
14
15// This GM reproduces the issue in crbug.com/472795. The SkImageSource image
16// is shifted for high quality mode between cpu and gpu.
17class ImageSourceGM : public GM {
18public:
19    ImageSourceGM(const char* suffix, SkFilterQuality filter) : fSuffix(suffix), fFilter(filter) {
20        this->setBGColor(0xFFFFFFFF);
21    }
22
23protected:
24    SkString onShortName() override {
25        SkString name("imagesrc2_");
26        name.append(fSuffix);
27        return name;
28    }
29
30    SkISize onISize() override { return SkISize::Make(256, 256); }
31
32    // Create an image with high frequency vertical stripes
33    void onOnceBeforeDraw() override {
34        constexpr SkPMColor gColors[] = {
35            SK_ColorRED,     SK_ColorGRAY,
36            SK_ColorGREEN,   SK_ColorGRAY,
37            SK_ColorBLUE,    SK_ColorGRAY,
38            SK_ColorCYAN,    SK_ColorGRAY,
39            SK_ColorMAGENTA, SK_ColorGRAY,
40            SK_ColorYELLOW,  SK_ColorGRAY,
41            SK_ColorWHITE,   SK_ColorGRAY,
42        };
43
44        auto surface(SkSurface::MakeRasterN32Premul(kImageSize, kImageSize));
45        SkCanvas* canvas = surface->getCanvas();
46
47        int curColor = 0;
48
49        for (int x = 0; x < kImageSize; x += 3) {
50            SkRect r = SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(0),
51                                        SkIntToScalar(3), SkIntToScalar(kImageSize));
52            SkPaint p;
53            p.setColor(gColors[curColor]);
54            canvas->drawRect(r, p);
55
56            curColor = (curColor+1) % SK_ARRAY_COUNT(gColors);
57        }
58
59        fImage = surface->makeImageSnapshot();
60    }
61
62    void onDraw(SkCanvas* canvas) override {
63        const SkRect srcRect = SkRect::MakeLTRB(0, 0,
64                                                SkIntToScalar(kImageSize),
65                                                SkIntToScalar(kImageSize));
66        const SkRect dstRect = SkRect::MakeLTRB(0.75f, 0.75f, 225.75f, 225.75f);
67
68        SkPaint p;
69        p.setImageFilter(SkImageSource::Make(fImage, srcRect, dstRect, fFilter));
70
71        canvas->saveLayer(nullptr, &p);
72        canvas->restore();
73    }
74
75private:
76    static constexpr int kImageSize = 503;
77
78    SkString fSuffix;
79    SkFilterQuality fFilter;
80    sk_sp<SkImage>  fImage;
81
82    typedef GM INHERITED;
83};
84
85//////////////////////////////////////////////////////////////////////////////
86
87DEF_GM(return new ImageSourceGM("none", kNone_SkFilterQuality);)
88DEF_GM(return new ImageSourceGM("low", kLow_SkFilterQuality);)
89DEF_GM(return new ImageSourceGM("med", kMedium_SkFilterQuality);)
90DEF_GM(return new ImageSourceGM("high", kHigh_SkFilterQuality);)
91}
92