1
2 /*
3 * Copyright 2011 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 "SampleCode.h"
9 #include "SkView.h"
10 #include "SkCanvas.h"
11 #include "SkShader.h"
12 #include "SkUtils.h"
13 #include "SkDevice.h"
14
create_bitmap(SkBitmap * bitmap)15 static void create_bitmap(SkBitmap* bitmap) {
16 const int W = 100;
17 const int H = 100;
18 bitmap->setConfig(SkBitmap::kARGB_8888_Config, W, H);
19 bitmap->allocPixels();
20
21 SkCanvas canvas(*bitmap);
22 canvas.drawColor(SK_ColorRED);
23 SkPaint paint;
24 paint.setColor(SK_ColorBLUE);
25 canvas.drawCircle(SkIntToScalar(W)/2, SkIntToScalar(H)/2, SkIntToScalar(W)/2, paint);
26 }
27
28 class DrawBitmapView : public SampleView {
29 SkPath fPath;
30 public:
DrawBitmapView()31 DrawBitmapView() {}
32
33 protected:
34 // overrides from SkEventSink
onQuery(SkEvent * evt)35 virtual bool onQuery(SkEvent* evt) {
36 if (SampleCode::TitleQ(*evt)) {
37 SampleCode::TitleR(evt, "DrawBitmap");
38 return true;
39 }
40 return this->INHERITED::onQuery(evt);
41 }
42
onDrawContent(SkCanvas * canvas)43 virtual void onDrawContent(SkCanvas* canvas) {
44 SkBitmap bitmap;
45 create_bitmap(&bitmap);
46 int x = bitmap.width() / 2;
47 int y = bitmap.height() / 2;
48 SkBitmap subset;
49 bitmap.extractSubset(&subset, SkIRect::MakeXYWH(x, y, x, y));
50
51 canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
52
53 canvas->drawBitmap(bitmap, 0, 0);
54 canvas->drawBitmap(subset, 0, 0);
55
56 // Now do the same but with a device bitmap as source image
57 SkRefPtr<SkDevice> primaryDevice(canvas->getDevice());
58 SkRefPtr<SkDevice> secondDevice(canvas->createCompatibleDevice(
59 SkBitmap::kARGB_8888_Config, bitmap.width(),
60 bitmap.height(), true));
61 secondDevice->unref();
62 SkCanvas secondCanvas(secondDevice.get());
63 secondCanvas.writePixels(bitmap, 0, 0);
64
65 SkBitmap deviceBitmap = secondDevice->accessBitmap(false);
66 SkBitmap deviceSubset;
67 deviceBitmap.extractSubset(&deviceSubset,
68 SkIRect::MakeXYWH(x, y, x, y));
69
70 canvas->translate(SkIntToScalar(120), SkIntToScalar(0));
71
72 canvas->drawBitmap(deviceBitmap, 0, 0);
73 canvas->drawBitmap(deviceSubset, 0, 0);
74
75 }
76
77 private:
78 typedef SampleView INHERITED;
79 };
80
81 //////////////////////////////////////////////////////////////////////////////
82
MyFactory()83 static SkView* MyFactory() { return new DrawBitmapView; }
84 static SkViewRegister reg(MyFactory);
85