1/*
2 * Copyright 2012 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 "SkCanvas.h"
10#include "SkGradientShader.h"
11#include "SkSurface.h"
12
13#if SK_SUPPORT_GPU
14    #include "SkGpuDevice.h"
15#endif
16
17#define W   SkIntToScalar(80)
18#define H   SkIntToScalar(60)
19
20typedef void (*PaintProc)(SkPaint*);
21
22static void identity_paintproc(SkPaint* paint) {
23    paint->setShader(NULL);
24}
25
26static void gradient_paintproc(SkPaint* paint) {
27    const SkColor colors[] = { SK_ColorGREEN, SK_ColorBLUE };
28    const SkPoint pts[] = { { 0, 0 }, { W, H } };
29    SkShader* s = SkGradientShader::CreateLinear(pts, colors, NULL,
30                                                 SK_ARRAY_COUNT(colors),
31                                                 SkShader::kClamp_TileMode);
32    paint->setShader(s)->unref();
33}
34
35typedef void (*Proc)(SkCanvas*, const SkPaint&);
36
37static void draw_hair(SkCanvas* canvas, const SkPaint& paint) {
38    SkPaint p(paint);
39    p.setStrokeWidth(0);
40    canvas->drawLine(0, 0, W, H, p);
41}
42
43static void draw_thick(SkCanvas* canvas, const SkPaint& paint) {
44    SkPaint p(paint);
45    p.setStrokeWidth(H/5);
46    canvas->drawLine(0, 0, W, H, p);
47}
48
49static void draw_rect(SkCanvas* canvas, const SkPaint& paint) {
50    canvas->drawRect(SkRect::MakeWH(W, H), paint);
51}
52
53static void draw_oval(SkCanvas* canvas, const SkPaint& paint) {
54    canvas->drawOval(SkRect::MakeWH(W, H), paint);
55}
56
57static void draw_text(SkCanvas* canvas, const SkPaint& paint) {
58    SkPaint p(paint);
59    p.setTextSize(H/4);
60    canvas->drawText("Hamburge", 8, 0, H*2/3, p);
61}
62
63class SrcModeGM : public skiagm::GM {
64    SkPath fPath;
65public:
66    SrcModeGM() {
67        this->setBGColor(SK_ColorBLACK);
68    }
69
70protected:
71    virtual SkString onShortName() {
72        return SkString("srcmode");
73    }
74
75    virtual SkISize onISize() {
76        return SkISize::Make(640, 760);
77    }
78
79    void drawContent(SkCanvas* canvas) {
80        canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
81
82        SkPaint paint;
83        sk_tool_utils::set_portable_typeface(&paint);
84        paint.setColor(0x80FF0000);
85
86        const Proc procs[] = {
87            draw_hair, draw_thick, draw_rect, draw_oval, draw_text
88        };
89
90        const SkXfermode::Mode modes[] = {
91            SkXfermode::kSrcOver_Mode, SkXfermode::kSrc_Mode, SkXfermode::kClear_Mode
92        };
93
94        const PaintProc paintProcs[] = {
95            identity_paintproc, gradient_paintproc
96        };
97
98        for (int aa = 0; aa <= 1; ++aa) {
99            paint.setAntiAlias(SkToBool(aa));
100            canvas->save();
101            for (size_t i = 0; i < SK_ARRAY_COUNT(paintProcs); ++i) {
102                paintProcs[i](&paint);
103                for (size_t x = 0; x < SK_ARRAY_COUNT(modes); ++x) {
104                    paint.setXfermodeMode(modes[x]);
105                    canvas->save();
106                    for (size_t y = 0; y < SK_ARRAY_COUNT(procs); ++y) {
107                        procs[y](canvas, paint);
108                        canvas->translate(0, H * 5 / 4);
109                    }
110                    canvas->restore();
111                    canvas->translate(W * 5 / 4, 0);
112                }
113            }
114            canvas->restore();
115            canvas->translate(0, (H * 5 / 4) * SK_ARRAY_COUNT(procs));
116        }
117    }
118
119    static SkSurface* compat_surface(SkCanvas* canvas, const SkISize& size, bool skipGPU) {
120        SkImageInfo info = SkImageInfo::MakeN32Premul(size);
121
122        bool callNewSurface = true;
123#if SK_SUPPORT_GPU
124        if (canvas->getGrContext() && skipGPU) {
125            callNewSurface = false;
126        }
127#endif
128        SkSurface* surface = callNewSurface ? canvas->newSurface(info) : NULL;
129        if (NULL == surface) {
130            // picture canvas will return null, so fall-back to raster
131            surface = SkSurface::NewRaster(info);
132        }
133        return surface;
134    }
135
136    virtual void onDraw(SkCanvas* canvas) {
137        SkAutoTUnref<SkSurface> surf(compat_surface(canvas, this->getISize(),
138                                                    this->isCanvasDeferred()));
139        surf->getCanvas()->drawColor(SK_ColorWHITE);
140        this->drawContent(surf->getCanvas());
141        surf->draw(canvas, 0, 0, NULL);
142    }
143
144private:
145    typedef skiagm::GM INHERITED;
146};
147
148///////////////////////////////////////////////////////////////////////////////
149
150DEF_GM(return new SrcModeGM;)
151