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
15 namespace skiagm {
16
17 class ImageAlphaThresholdGM : public GM {
18 public:
ImageAlphaThresholdGM()19 ImageAlphaThresholdGM() {
20 this->setBGColor(0xFFFFFFFF);
21 }
22
23 protected:
24
onShortName()25 SkString onShortName() override {
26 return SkString("imagealphathreshold");
27 }
28
onISize()29 SkISize onISize() override {
30 return SkISize::Make(WIDTH, HEIGHT);
31 }
32
onDraw(SkCanvas * canvas)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
70 private:
71 typedef GM INHERITED;
72 };
73
74 //////////////////////////////////////////////////////////////////////////////
75
MyFactory(void *)76 static GM* MyFactory(void*) { return new ImageAlphaThresholdGM; }
77 static GMRegistry reg(MyFactory);
78
79 }
80