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 "SkBlendImageFilter.h"
10#include "SkBitmapSource.h"
11
12namespace skiagm {
13
14class ImageBlendGM : public GM {
15public:
16    ImageBlendGM() : fInitialized(false) {
17        this->setBGColor(0xFF000000);
18    }
19
20protected:
21    virtual SkString onShortName() {
22        return SkString("blend");
23    }
24
25    void make_bitmap() {
26        fBitmap.setConfig(SkBitmap::kARGB_8888_Config, 80, 80);
27        fBitmap.allocPixels();
28        SkDevice device(fBitmap);
29        SkCanvas canvas(&device);
30        canvas.clear(0x00000000);
31        SkPaint paint;
32        paint.setAntiAlias(true);
33        paint.setColor(0xD000D000);
34        paint.setTextSize(SkIntToScalar(96));
35        const char* str = "e";
36        canvas.drawText(str, strlen(str), SkIntToScalar(15), SkIntToScalar(65), paint);
37    }
38
39    void make_checkerboard() {
40        fCheckerboard.setConfig(SkBitmap::kARGB_8888_Config, 80, 80);
41        fCheckerboard.allocPixels();
42        SkDevice device(fCheckerboard);
43        SkCanvas canvas(&device);
44        canvas.clear(0x00000000);
45        SkPaint darkPaint;
46        darkPaint.setColor(0xFF404040);
47        SkPaint lightPaint;
48        lightPaint.setColor(0xFFA0A0A0);
49        for (int y = 0; y < 80; y += 16) {
50          for (int x = 0; x < 80; x += 16) {
51            canvas.save();
52            canvas.translate(SkIntToScalar(x), SkIntToScalar(y));
53            canvas.drawRect(SkRect::MakeXYWH(0, 0, 8, 8), darkPaint);
54            canvas.drawRect(SkRect::MakeXYWH(8, 0, 8, 8), lightPaint);
55            canvas.drawRect(SkRect::MakeXYWH(0, 8, 8, 8), lightPaint);
56            canvas.drawRect(SkRect::MakeXYWH(8, 8, 8, 8), darkPaint);
57            canvas.restore();
58          }
59        }
60    }
61
62    virtual SkISize onISize() {
63        return make_isize(500, 100);
64    }
65
66    void drawClippedBitmap(SkCanvas* canvas, const SkPaint& paint, int x) {
67        canvas->save();
68        canvas->clipRect(SkRect::MakeXYWH(SkIntToScalar(x), 0,
69            SkIntToScalar(fBitmap.width()), SkIntToScalar(fBitmap.height())));
70        canvas->drawBitmap(fBitmap, SkIntToScalar(x), 0, &paint);
71        canvas->restore();
72    }
73
74    virtual void onDraw(SkCanvas* canvas) {
75        if (!fInitialized) {
76            make_bitmap();
77            make_checkerboard();
78            fInitialized = true;
79        }
80        canvas->clear(0x00000000);
81        SkPaint paint;
82        SkAutoTUnref<SkImageFilter> background(SkNEW_ARGS(SkBitmapSource, (fCheckerboard)));
83        paint.setImageFilter(SkNEW_ARGS(SkBlendImageFilter, (SkBlendImageFilter::kNormal_Mode, background)))->unref();
84        drawClippedBitmap(canvas, paint, 0);
85        paint.setImageFilter(SkNEW_ARGS(SkBlendImageFilter, (SkBlendImageFilter::kMultiply_Mode, background)))->unref();
86        drawClippedBitmap(canvas, paint, 100);
87        paint.setImageFilter(SkNEW_ARGS(SkBlendImageFilter, (SkBlendImageFilter::kScreen_Mode, background)))->unref();
88        drawClippedBitmap(canvas, paint, 200);
89        paint.setImageFilter(SkNEW_ARGS(SkBlendImageFilter, (SkBlendImageFilter::kDarken_Mode, background)))->unref();
90        drawClippedBitmap(canvas, paint, 300);
91        paint.setImageFilter(SkNEW_ARGS(SkBlendImageFilter, (SkBlendImageFilter::kLighten_Mode, background)))->unref();
92        drawClippedBitmap(canvas, paint, 400);
93    }
94
95private:
96    typedef GM INHERITED;
97    SkBitmap fBitmap, fCheckerboard;
98    bool fInitialized;
99};
100
101//////////////////////////////////////////////////////////////////////////////
102
103static GM* MyFactory(void*) { return new ImageBlendGM; }
104static GMRegistry reg(MyFactory);
105
106}
107