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->allocN32Pixels(20, 20);
21    bm->eraseColor(SK_ColorRED);
22
23    SkCanvas canvas(*bm);
24    canvas.drawCircle(10, 10, 5, bluePaint);
25}
26
27static 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
38static void adopt_shader(SkPaint* paint, SkShader* shader) {
39    paint->setShader(shader);
40    SkSafeUnref(shader);
41}
42
43class BitmapShaderGM : public GM {
44
45protected:
46    void onOnceBeforeDraw() override {
47        this->setBGColor(SK_ColorGRAY);
48        draw_bm(&fBitmap);
49        draw_mask(&fMask);
50    }
51
52    virtual SkString onShortName() {
53        return SkString("bitmapshaders");
54    }
55
56    virtual SkISize onISize() {
57        return SkISize::Make(150, 100);
58    }
59
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
106private:
107    SkBitmap fBitmap;
108    SkBitmap fMask;
109
110    typedef GM INHERITED;
111};
112
113//////////////////////////////////////////////////////////////////////////////
114
115static GM* MyFactory(void*) { return new BitmapShaderGM; }
116static GMRegistry reg(MyFactory);
117
118}
119