aboutsummaryrefslogtreecommitdiffhomepage
path: root/gm/srcmode.cpp
blob: 0f2591c828bfd233e226a6f6999ce14696ead4e8 (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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/*
 * Copyright 2012 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 "SkGradientShader.h"
#include "SkSurface.h"

#if SK_SUPPORT_GPU
    #include "SkGpuDevice.h"
#endif

#define W   SkIntToScalar(80)
#define H   SkIntToScalar(60)

typedef void (*PaintProc)(SkPaint*);

static void identity_paintproc(SkPaint* paint) {
    paint->setShader(NULL);
}

static void gradient_paintproc(SkPaint* paint) {
    const SkColor colors[] = { SK_ColorGREEN, SK_ColorBLUE };
    const SkPoint pts[] = { { 0, 0 }, { W, H } };
    SkShader* s = SkGradientShader::CreateLinear(pts, colors, NULL,
                                                 SK_ARRAY_COUNT(colors),
                                                 SkShader::kClamp_TileMode);
    paint->setShader(s)->unref();
}

typedef void (*Proc)(SkCanvas*, const SkPaint&);

static void draw_hair(SkCanvas* canvas, const SkPaint& paint) {
    SkPaint p(paint);
    p.setStrokeWidth(0);
    canvas->drawLine(0, 0, W, H, p);
}

static void draw_thick(SkCanvas* canvas, const SkPaint& paint) {
    SkPaint p(paint);
    p.setStrokeWidth(H/5);
    canvas->drawLine(0, 0, W, H, p);
}

static void draw_rect(SkCanvas* canvas, const SkPaint& paint) {
    canvas->drawRect(SkRect::MakeWH(W, H), paint);
}

static void draw_oval(SkCanvas* canvas, const SkPaint& paint) {
    canvas->drawOval(SkRect::MakeWH(W, H), paint);
}

static void draw_text(SkCanvas* canvas, const SkPaint& paint) {
    SkPaint p(paint);
    p.setTextSize(H/4);
    canvas->drawText("Hamburge", 8, 0, H*2/3, p);
}

class SrcModeGM : public skiagm::GM {
    SkPath fPath;
public:
    SrcModeGM() {
        this->setBGColor(SK_ColorBLACK);
    }

protected:
    virtual SkString onShortName() {
        return SkString("srcmode");
    }

    virtual SkISize onISize() {
        return SkISize::Make(640, 760);
    }

    void drawContent(SkCanvas* canvas) {
        canvas->translate(SkIntToScalar(20), SkIntToScalar(20));

        SkPaint paint;
        paint.setColor(0x80FF0000);

        const Proc procs[] = {
            draw_hair, draw_thick, draw_rect, draw_oval, draw_text
        };

        const SkXfermode::Mode modes[] = {
            SkXfermode::kSrcOver_Mode, SkXfermode::kSrc_Mode, SkXfermode::kClear_Mode
        };

        const PaintProc paintProcs[] = {
            identity_paintproc, gradient_paintproc
        };

        for (int aa = 0; aa <= 1; ++aa) {
            paint.setAntiAlias(SkToBool(aa));
            canvas->save();
            for (size_t i = 0; i < SK_ARRAY_COUNT(paintProcs); ++i) {
                paintProcs[i](&paint);
                for (size_t x = 0; x < SK_ARRAY_COUNT(modes); ++x) {
                    paint.setXfermodeMode(modes[x]);
                    canvas->save();
                    for (size_t y = 0; y < SK_ARRAY_COUNT(procs); ++y) {
                        procs[y](canvas, paint);
                        canvas->translate(0, H * 5 / 4);
                    }
                    canvas->restore();
                    canvas->translate(W * 5 / 4, 0);
                }
            }
            canvas->restore();
            canvas->translate(0, (H * 5 / 4) * SK_ARRAY_COUNT(procs));
        }
    }

    static SkSurface* compat_surface(SkCanvas* canvas, const SkISize& size,
                                     bool skipGPU) {
        SkImage::Info info = {
            size.width(),
            size.height(),
            SkImage::kPMColor_ColorType,
            kPremul_SkAlphaType
        };
#if SK_SUPPORT_GPU
        SkBaseDevice* dev = canvas->getDevice();
        if (!skipGPU && dev->accessRenderTarget()) {
            SkGpuDevice* gd = (SkGpuDevice*)dev;
            GrContext* ctx = gd->context();
            return SkSurface::NewRenderTarget(ctx, info, 0);
        }
#endif
        return SkSurface::NewRaster(info);
    }

    virtual void onDraw(SkCanvas* canvas) {
        SkAutoTUnref<SkSurface> surf(compat_surface(canvas, this->getISize(),
                                                    this->isCanvasDeferred()));
        surf->getCanvas()->drawColor(SK_ColorWHITE);
        this->drawContent(surf->getCanvas());
        surf->draw(canvas, 0, 0, NULL);
    }

private:
    typedef skiagm::GM INHERITED;
};

///////////////////////////////////////////////////////////////////////////////

DEF_GM(return new SrcModeGM;)