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 #include "gm.h"
8 #include "sk_tool_utils.h"
9
10 #include "SkBitmap.h"
11 #include "SkPaint.h"
12 #include "SkShader.h"
13
14 namespace skiagm {
15
draw_bm(SkBitmap * bm)16 static void draw_bm(SkBitmap* bm) {
17 SkPaint bluePaint;
18 bluePaint.setColor(SK_ColorBLUE);
19
20 bm->allocN32Pixels(20, 20);
21 bm->eraseColor(SK_ColorRED);
22
23 SkCanvas canvas(*bm);
24 canvas.drawCircle(10, 10, 5, bluePaint);
25 }
26
draw_mask(SkBitmap * bm)27 static void draw_mask(SkBitmap* bm) {
28 SkPaint circlePaint;
29 circlePaint.setColor(SK_ColorBLACK);
30
31 bm->allocPixels(SkImageInfo::MakeA8(20, 20));
32 bm->eraseColor(SK_ColorTRANSPARENT);
33
34 SkCanvas canvas(*bm);
35 canvas.drawCircle(10, 10, 10, circlePaint);
36 }
37
38 class BitmapShaderGM : public GM {
39
40 protected:
onOnceBeforeDraw()41 void onOnceBeforeDraw() override {
42 this->setBGColor(sk_tool_utils::color_to_565(SK_ColorGRAY));
43 draw_bm(&fBitmap);
44 draw_mask(&fMask);
45 }
46
onShortName()47 SkString onShortName() override {
48 return SkString("bitmapshaders");
49 }
50
onISize()51 SkISize onISize() override {
52 return SkISize::Make(150, 100);
53 }
54
onDraw(SkCanvas * canvas)55 void onDraw(SkCanvas* canvas) override {
56 SkPaint paint;
57
58 for (int i = 0; i < 2; i++) {
59 SkMatrix s;
60 s.reset();
61 if (1 == i) {
62 s.setScale(1.5f, 1.5f);
63 s.postTranslate(2, 2);
64 }
65
66 canvas->save();
67 paint.setShader(SkShader::MakeBitmapShader(fBitmap, SkShader::kClamp_TileMode,
68 SkShader::kClamp_TileMode, &s));
69
70 // draw the shader with a bitmap mask
71 canvas->drawBitmap(fMask, 0, 0, &paint);
72 canvas->drawBitmap(fMask, 30, 0, &paint);
73
74 canvas->translate(0, 25);
75
76 canvas->drawCircle(10, 10, 10, paint);
77 canvas->drawCircle(40, 10, 10, paint); // no blue circle expected
78
79 canvas->translate(0, 25);
80
81 // clear the shader, colorized by a solid color with a bitmap mask
82 paint.setShader(nullptr);
83 paint.setColor(SK_ColorGREEN);
84 canvas->drawBitmap(fMask, 0, 0, &paint);
85 canvas->drawBitmap(fMask, 30, 0, &paint);
86
87 canvas->translate(0, 25);
88
89 paint.setShader(SkShader::MakeBitmapShader(fMask, SkShader::kRepeat_TileMode,
90 SkShader::kRepeat_TileMode, &s));
91 paint.setColor(SK_ColorRED);
92
93 // draw the mask using the shader and a color
94 canvas->drawRect(SkRect::MakeXYWH(0, 0, 20, 20), paint);
95 canvas->drawRect(SkRect::MakeXYWH(30, 0, 20, 20), paint);
96 canvas->restore();
97 canvas->translate(60, 0);
98 }
99 }
100
101 private:
102 SkBitmap fBitmap;
103 SkBitmap fMask;
104
105 typedef GM INHERITED;
106 };
107
108 //////////////////////////////////////////////////////////////////////////////
109
MyFactory(void *)110 static GM* MyFactory(void*) { return new BitmapShaderGM; }
111 static GMRegistry reg(MyFactory);
112
113 }
114