1/*
2 * Copyright 2013 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 "SkAlphaThresholdFilter.h"
10#include "SkRandom.h"
11
12#define WIDTH 500
13#define HEIGHT 500
14
15namespace skiagm {
16
17class ImageAlphaThresholdGM : public GM {
18public:
19    ImageAlphaThresholdGM() {
20        this->setBGColor(0xFFFFFFFF);
21    }
22
23protected:
24    virtual uint32_t onGetFlags() const SK_OVERRIDE {
25        return this->INHERITED::onGetFlags() |
26               GM::kSkipTiled_Flag |
27               GM::kSkipPicture_Flag |
28               GM::kSkipPipe_Flag |
29               GM::kSkipPipeCrossProcess_Flag;
30    }
31
32    virtual SkString onShortName() SK_OVERRIDE {
33        return SkString("imagealphathreshold");
34    }
35
36    virtual SkISize onISize() SK_OVERRIDE {
37        return SkISize::Make(WIDTH, HEIGHT);
38    }
39
40    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
41        SkIRect rects[2];
42        rects[0] = SkIRect::MakeXYWH(0, 150, WIDTH, HEIGHT - 300);
43        rects[1] = SkIRect::MakeXYWH(150, 0, WIDTH - 300, HEIGHT);
44        SkRegion region;
45        region.setRects(rects, 2);
46
47        SkMatrix matrix;
48        matrix.reset();
49        matrix.setTranslate(WIDTH * .1f, HEIGHT * .1f);
50        matrix.postScale(.8f, .8f);
51
52        canvas->concat(matrix);
53
54        SkPaint paint;
55        paint.setImageFilter(
56            SkAlphaThresholdFilter::Create(region, 0.2f, 0.7f))->unref();
57        canvas->saveLayer(NULL, &paint);
58        paint.setAntiAlias(true);
59
60        SkPaint rect_paint;
61        rect_paint.setColor(0xFF0000FF);
62        canvas->drawRect(SkRect::MakeXYWH(0, 0, WIDTH / 2, HEIGHT / 2),
63                         rect_paint);
64        rect_paint.setColor(0xBFFF0000);
65        canvas->drawRect(SkRect::MakeXYWH(WIDTH / 2, 0, WIDTH / 2, HEIGHT / 2),
66                         rect_paint);
67        rect_paint.setColor(0x3F00FF00);
68        canvas->drawRect(SkRect::MakeXYWH(0, HEIGHT / 2, WIDTH / 2, HEIGHT / 2),
69                         rect_paint);
70        rect_paint.setColor(0x00000000);
71        canvas->drawRect(SkRect::MakeXYWH(WIDTH / 2, HEIGHT / 2, WIDTH / 2, HEIGHT / 2),
72                         rect_paint);
73
74        canvas->restore();
75    }
76
77private:
78    typedef GM INHERITED;
79};
80
81//////////////////////////////////////////////////////////////////////////////
82
83static GM* MyFactory(void*) { return new ImageAlphaThresholdGM; }
84static GMRegistry reg(MyFactory);
85
86}
87