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
25    SkString onShortName() override {
26        return SkString("imagealphathreshold");
27    }
28
29    SkISize onISize() override {
30        return SkISize::Make(WIDTH, HEIGHT);
31    }
32
33    void onDraw(SkCanvas* canvas) override {
34        SkIRect rects[2];
35        rects[0] = SkIRect::MakeXYWH(0, 150, WIDTH, HEIGHT - 300);
36        rects[1] = SkIRect::MakeXYWH(150, 0, WIDTH - 300, HEIGHT);
37        SkRegion region;
38        region.setRects(rects, 2);
39
40        SkMatrix matrix;
41        matrix.reset();
42        matrix.setTranslate(WIDTH * .1f, HEIGHT * .1f);
43        matrix.postScale(.8f, .8f);
44
45        canvas->concat(matrix);
46
47        SkPaint paint;
48        paint.setImageFilter(
49            SkAlphaThresholdFilter::Create(region, 0.2f, 0.7f))->unref();
50        canvas->saveLayer(NULL, &paint);
51        paint.setAntiAlias(true);
52
53        SkPaint rect_paint;
54        rect_paint.setColor(0xFF0000FF);
55        canvas->drawRect(SkRect::MakeXYWH(0, 0, WIDTH / 2, HEIGHT / 2),
56                         rect_paint);
57        rect_paint.setColor(0xBFFF0000);
58        canvas->drawRect(SkRect::MakeXYWH(WIDTH / 2, 0, WIDTH / 2, HEIGHT / 2),
59                         rect_paint);
60        rect_paint.setColor(0x3F00FF00);
61        canvas->drawRect(SkRect::MakeXYWH(0, HEIGHT / 2, WIDTH / 2, HEIGHT / 2),
62                         rect_paint);
63        rect_paint.setColor(0x00000000);
64        canvas->drawRect(SkRect::MakeXYWH(WIDTH / 2, HEIGHT / 2, WIDTH / 2, HEIGHT / 2),
65                         rect_paint);
66
67        canvas->restore();
68    }
69
70private:
71    typedef GM INHERITED;
72};
73
74//////////////////////////////////////////////////////////////////////////////
75
76static GM* MyFactory(void*) { return new ImageAlphaThresholdGM; }
77static GMRegistry reg(MyFactory);
78
79}
80