1
2 /*
3 * Copyright 2013 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8 #include "gm.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
adopt_shader(SkPaint * paint,SkShader * shader)38 static void adopt_shader(SkPaint* paint, SkShader* shader) {
39 paint->setShader(shader);
40 SkSafeUnref(shader);
41 }
42
43 class BitmapShaderGM : public GM {
44
45 protected:
onOnceBeforeDraw()46 void onOnceBeforeDraw() override {
47 this->setBGColor(SK_ColorGRAY);
48 draw_bm(&fBitmap);
49 draw_mask(&fMask);
50 }
51
onShortName()52 virtual SkString onShortName() {
53 return SkString("bitmapshaders");
54 }
55
onISize()56 virtual SkISize onISize() {
57 return SkISize::Make(150, 100);
58 }
59
onDraw(SkCanvas * canvas)60 virtual void onDraw(SkCanvas* canvas) {
61 SkPaint paint;
62
63 for (int i = 0; i < 2; i++) {
64 SkMatrix s;
65 s.reset();
66 if (1 == i) {
67 s.setScale(1.5f, 1.5f);
68 s.postTranslate(2, 2);
69 }
70
71 canvas->save();
72 adopt_shader(&paint, SkShader::CreateBitmapShader(fBitmap, SkShader::kClamp_TileMode,
73 SkShader::kClamp_TileMode, &s));
74
75 // draw the shader with a bitmap mask
76 canvas->drawBitmap(fMask, 0, 0, &paint);
77 canvas->drawBitmap(fMask, 30, 0, &paint);
78
79 canvas->translate(0, 25);
80
81 canvas->drawCircle(10, 10, 10, paint);
82 canvas->drawCircle(40, 10, 10, paint); // no blue circle expected
83
84 canvas->translate(0, 25);
85
86 // clear the shader, colorized by a solid color with a bitmap mask
87 paint.setShader(NULL);
88 paint.setColor(SK_ColorGREEN);
89 canvas->drawBitmap(fMask, 0, 0, &paint);
90 canvas->drawBitmap(fMask, 30, 0, &paint);
91
92 canvas->translate(0, 25);
93
94 adopt_shader(&paint, SkShader::CreateBitmapShader(fMask, SkShader::kRepeat_TileMode,
95 SkShader::kRepeat_TileMode, &s));
96 paint.setColor(SK_ColorRED);
97
98 // draw the mask using the shader and a color
99 canvas->drawRect(SkRect::MakeXYWH(0, 0, 20, 20), paint);
100 canvas->drawRect(SkRect::MakeXYWH(30, 0, 20, 20), paint);
101 canvas->restore();
102 canvas->translate(60, 0);
103 }
104 }
105
106 private:
107 SkBitmap fBitmap;
108 SkBitmap fMask;
109
110 typedef GM INHERITED;
111 };
112
113 //////////////////////////////////////////////////////////////////////////////
114
MyFactory(void *)115 static GM* MyFactory(void*) { return new BitmapShaderGM; }
116 static GMRegistry reg(MyFactory);
117
118 }
119