aboutsummaryrefslogtreecommitdiffhomepage
path: root/gm/image_shader.cpp
blob: 02e667957f44762f37469bd84940b3df632b47f7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
/*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "gm.h"
#include "SkCanvas.h"
#include "SkData.h"
#include "SkImage.h"
#include "SkPictureRecorder.h"
#include "SkSurface.h"

static void draw_something(SkCanvas* canvas, const SkRect& bounds) {
    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setColor(SK_ColorRED);
    paint.setStyle(SkPaint::kStroke_Style);
    paint.setStrokeWidth(10);
    canvas->drawRect(bounds, paint);
    paint.setStyle(SkPaint::kFill_Style);
    paint.setColor(SK_ColorBLUE);
    canvas->drawOval(bounds, paint);
}

typedef sk_sp<SkImage> (*ImageMakerProc)(GrContext*, SkPicture*, const SkImageInfo&);

static sk_sp<SkImage> make_raster(GrContext*, SkPicture* pic, const SkImageInfo& info) {
    auto surface(SkSurface::MakeRaster(info));
    surface->getCanvas()->clear(0);
    surface->getCanvas()->drawPicture(pic);
    return surface->makeImageSnapshot();
}

static sk_sp<SkImage> make_texture(GrContext* ctx, SkPicture* pic, const SkImageInfo& info) {
    if (!ctx) {
        return nullptr;
    }
    auto surface(SkSurface::MakeRenderTarget(ctx, SkBudgeted::kNo, info));
    if (!surface) {
        return nullptr;
    }
    surface->getCanvas()->clear(0);
    surface->getCanvas()->drawPicture(pic);
    return surface->makeImageSnapshot();
}

static sk_sp<SkImage> make_pict_gen(GrContext*, SkPicture* pic, const SkImageInfo& info) {
    return SkImage::MakeFromPicture(sk_ref_sp(pic), info.dimensions(), nullptr, nullptr,
                                    SkImage::BitDepth::kU8,
                                    SkColorSpace::MakeSRGB());
}

static sk_sp<SkImage> make_encode_gen(GrContext* ctx, SkPicture* pic, const SkImageInfo& info) {
    sk_sp<SkImage> src(make_raster(ctx, pic, info));
    if (!src) {
        return nullptr;
    }
    sk_sp<SkData> encoded(src->encode(SkEncodedImageFormat::kPNG, 100));
    if (!encoded) {
        return nullptr;
    }
    return SkImage::MakeFromEncoded(std::move(encoded));
}

const ImageMakerProc gProcs[] = {
    make_raster,
    make_texture,
    make_pict_gen,
    make_encode_gen,
};

/*
 *  Exercise drawing pictures inside an image, showing that the image version is pixelated
 *  (correctly) when it is inside an image.
 */
class ImageShaderGM : public skiagm::GM {
    sk_sp<SkPicture> fPicture;

public:
    ImageShaderGM() {}

protected:
    SkString onShortName() override {
        return SkString("image-shader");
    }

    SkISize onISize() override {
        return SkISize::Make(850, 450);
    }

    void onOnceBeforeDraw() override {
        const SkRect bounds = SkRect::MakeWH(100, 100);
        SkPictureRecorder recorder;
        draw_something(recorder.beginRecording(bounds), bounds);
        fPicture = recorder.finishRecordingAsPicture();
    }

    void testImage(SkCanvas* canvas, SkImage* image) {
        SkAutoCanvasRestore acr(canvas, true);

        canvas->drawImage(image, 0, 0);
        canvas->translate(0, 120);

        const SkShader::TileMode tile = SkShader::kRepeat_TileMode;
        const SkMatrix localM = SkMatrix::MakeTrans(-50, -50);
        SkPaint paint;
        paint.setShader(image->makeShader(tile, tile, &localM));
        paint.setAntiAlias(true);
        canvas->drawCircle(50, 50, 50, paint);
    }

    void onDraw(SkCanvas* canvas) override {
        canvas->translate(20, 20);

        const SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);

        for (size_t i = 0; i < SK_ARRAY_COUNT(gProcs); ++i) {
            sk_sp<SkImage> image(gProcs[i](canvas->getGrContext(), fPicture.get(), info));
            if (image) {
                this->testImage(canvas, image.get());
            }
            canvas->translate(120, 0);
        }
    }

private:
    typedef skiagm::GM INHERITED;
};
DEF_GM( return new ImageShaderGM; )