bitmapshader.cpp revision 7842c817e920a0e0c83be339f8d7e19b016c3373 
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
14namespace skiagm {
15
16static void draw_bm(SkBitmap* bm) {
17	SkPaint bluePaint;
18	bluePaint.setColor(SK_ColorBLUE);
19
20	bm->setConfig(SkBitmap::kARGB_8888_Config, 20, 20);
21	bm->allocPixels();
22	bm->eraseColor(SK_ColorRED);
23
24	SkCanvas canvas(*bm);
25	canvas.drawCircle(10, 10, 5, bluePaint);
26}
27
28static void draw_mask(SkBitmap* bm) {
29	SkPaint circlePaint;
30	circlePaint.setColor(SK_ColorBLACK);
31
32	bm->setConfig(SkBitmap::kA8_Config, 20, 20);
33	bm->allocPixels();
34	bm->eraseColor(SK_ColorTRANSPARENT);
35
36	SkCanvas canvas(*bm);
37	canvas.drawCircle(10, 10, 10, circlePaint);
38}
39
40class BitmapShaderGM : public GM {
41public:
42
43    BitmapShaderGM() {
44        this->setBGColor(SK_ColorGRAY);
45        draw_bm(&fBitmap);
46        draw_mask(&fMask);
47    }
48
49protected:
50    virtual SkString onShortName() {
51        return SkString("bitmapshaders");
52    }
53
54    virtual SkISize onISize() {
55        return make_isize(75, 100);
56    }
57
58    virtual void onDraw(SkCanvas* canvas) {
59    	SkShader* shader = SkShader::CreateBitmapShader(fBitmap,
60    			                                        SkShader::kClamp_TileMode,
61    			                                        SkShader::kClamp_TileMode);
62    	SkPaint paint;
63    	paint.setShader(shader);
64    	// release the shader ref as the paint now holds a reference
65    	shader->unref();
66
67    	// draw the shader with a bitmap mask
68    	canvas->drawBitmap(fMask, 0, 0, &paint);
69    	canvas->drawBitmap(fMask, 30, 0, &paint);
70
71       	canvas->translate(0, 25);
72
73    	// draw the shader with standard geometry
74       	canvas->drawCircle(10, 10, 10, paint);
75       	canvas->drawCircle(40, 10, 10, paint); // no blue circle expected
76
77       	canvas->translate(0, 25);
78
79    	shader = SkShader::CreateBitmapShader(fMask,
80    	                                      SkShader::kRepeat_TileMode,
81    	                                      SkShader::kRepeat_TileMode);
82    	paint.setShader(shader);
83    	paint.setColor(SK_ColorRED);
84    	shader->unref();
85
86       	// draw the mask using the shader and a color
87       	canvas->drawRect(SkRect::MakeXYWH(0, 0, 20, 20), paint);
88       	canvas->drawRect(SkRect::MakeXYWH(30, 0, 20, 20), paint);
89    }
90
91private:
92    SkBitmap fBitmap;
93    SkBitmap fMask;
94
95    typedef GM INHERITED;
96};
97
98//////////////////////////////////////////////////////////////////////////////
99
100static GM* MyFactory(void*) { return new BitmapShaderGM; }
101static GMRegistry reg(MyFactory);
102
103}
104