1 /*
2  * Copyright 2011 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 #include "SampleCode.h"
8 #include "SkView.h"
9 #include "SkBitmap.h"
10 #include "SkCanvas.h"
11 #include "SkCornerPathEffect.h"
12 #include "SkGradientShader.h"
13 #include "SkPath.h"
14 #include "SkRegion.h"
15 #include "SkShader.h"
16 #include "SkUtils.h"
17 
18 static void create_bitmap(SkBitmap* bitmap) {
19     const int W = 100;
20     const int H = 100;
21     bitmap->allocN32Pixels(W, H);
22 
23     SkCanvas canvas(*bitmap);
24     canvas.drawColor(SK_ColorRED);
25     SkPaint paint;
26     paint.setColor(SK_ColorBLUE);
27     canvas.drawCircle(SkIntToScalar(W)/2, SkIntToScalar(H)/2, SkIntToScalar(W)/2, paint);
28 }
29 
30 class WritePixelsView : public SampleView {
31     SkPath fPath;
32 public:
33     WritePixelsView() {}
34 
35 protected:
36     // overrides from SkEventSink
37     virtual bool onQuery(SkEvent* evt) {
38         if (SampleCode::TitleQ(*evt)) {
39             SampleCode::TitleR(evt, "WritePixels");
40             return true;
41         }
42         return this->INHERITED::onQuery(evt);
43     }
44 
45     virtual void onDrawContent(SkCanvas* canvas) {
46         SkBitmap bitmap;
47         create_bitmap(&bitmap);
48         int x = bitmap.width() / 2;
49         int y = bitmap.height() / 2;
50 
51         SkBitmap subset;
52         bitmap.extractSubset(&subset, SkIRect::MakeXYWH(x, y, x, y));
53 
54         canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
55 
56         canvas->writePixels(bitmap, 0, 0);
57         canvas->writePixels(subset, 0, 0);
58     }
59 
60 private:
61     typedef SampleView INHERITED;
62 };
63 
64 //////////////////////////////////////////////////////////////////////////////
65 
66 static SkView* MyFactory() { return new WritePixelsView; }
67 static SkViewRegister reg(MyFactory);
68