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->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
draw_mask(SkBitmap * bm)28 static 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
40 class BitmapShaderGM : public GM {
41 public:
42
BitmapShaderGM()43 BitmapShaderGM() {
44 this->setBGColor(SK_ColorGRAY);
45 draw_bm(&fBitmap);
46 draw_mask(&fMask);
47 }
48
49 protected:
onShortName()50 virtual SkString onShortName() {
51 return SkString("bitmapshaders");
52 }
53
onISize()54 virtual SkISize onISize() {
55 return make_isize(75, 100);
56 }
57
onDraw(SkCanvas * canvas)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
91 private:
92 SkBitmap fBitmap;
93 SkBitmap fMask;
94
95 typedef GM INHERITED;
96 };
97
98 //////////////////////////////////////////////////////////////////////////////
99
MyFactory(void *)100 static GM* MyFactory(void*) { return new BitmapShaderGM; }
101 static GMRegistry reg(MyFactory);
102
103 }
104