SampleWritePixels.cpp revision ceff2870bc5e9114c2b5262423b13cf1e84a76fb 
1#include "SampleCode.h"
2#include "SkView.h"
3#include "SkCanvas.h"
4#include "SkCornerPathEffect.h"
5#include "SkCullPoints.h"
6#include "SkGradientShader.h"
7#include "SkPath.h"
8#include "SkRegion.h"
9#include "SkShader.h"
10#include "SkUtils.h"
11
12static void create_bitmap(SkBitmap* bitmap) {
13    const int W = 100;
14    const int H = 100;
15    bitmap->setConfig(SkBitmap::kARGB_8888_Config, W, H);
16    bitmap->allocPixels();
17
18    SkCanvas canvas(*bitmap);
19    canvas.drawColor(SK_ColorRED);
20    SkPaint paint;
21    paint.setColor(SK_ColorBLUE);
22    canvas.drawCircle(SkIntToScalar(W)/2, SkIntToScalar(H)/2, SkIntToScalar(W)/2, paint);
23}
24
25class WritePixelsView : public SampleView {
26    SkPath fPath;
27public:
28	WritePixelsView() {}
29
30protected:
31    // overrides from SkEventSink
32    virtual bool onQuery(SkEvent* evt) {
33        if (SampleCode::TitleQ(*evt)) {
34            SampleCode::TitleR(evt, "WritePixels");
35            return true;
36        }
37        return this->INHERITED::onQuery(evt);
38    }
39
40    virtual void onDrawContent(SkCanvas* canvas) {
41        SkBitmap bitmap;
42        create_bitmap(&bitmap);
43        int x = bitmap.width() / 2;
44        int y = bitmap.height() / 2;
45
46        SkBitmap subset;
47        bitmap.extractSubset(&subset, SkIRect::MakeXYWH(x, y, x, y));
48
49        canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
50
51        canvas->writePixels(bitmap, 0, 0);
52        canvas->writePixels(subset, 0, 0);
53    }
54
55private:
56    typedef SampleView INHERITED;
57};
58
59//////////////////////////////////////////////////////////////////////////////
60
61static SkView* MyFactory() { return new WritePixelsView; }
62static SkViewRegister reg(MyFactory);
63
64