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