extractbitmap.cpp revision 6ea165dd8fcd31e0fa56f43de4eadd022151c2aa 
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 "gm.h"
9#include "SkBitmap.h"
10#include "SkCanvas.h"
11#include "SkDevice.h"
12#include "SkString.h"
13
14namespace skiagm {
15
16static void create_bitmap(SkBitmap* bitmap) {
17    const int W = 100;
18    const int H = 100;
19    bitmap->setConfig(SkBitmap::kARGB_8888_Config, W, H);
20    bitmap->allocPixels();
21
22    SkCanvas canvas(*bitmap);
23    canvas.drawColor(SK_ColorRED);
24    SkPaint paint;
25    paint.setColor(SK_ColorBLUE);
26    canvas.drawCircle(SkIntToScalar(W)/2, SkIntToScalar(H)/2, SkIntToScalar(W)/2, paint);
27}
28
29class ExtractBitmapGM : public GM {
30public:
31    ExtractBitmapGM() {}
32
33protected:
34    // overrides from SkEventSink
35    virtual SkString onShortName() SK_OVERRIDE {
36        return SkString("extractbitmap");
37    }
38
39    virtual SkISize onISize() SK_OVERRIDE {
40        return make_isize(600, 600);
41    }
42
43    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
44        SkBitmap bitmap;
45        create_bitmap(&bitmap);
46        int x = bitmap.width() / 2;
47        int y = bitmap.height() / 2;
48
49        canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
50
51        canvas->drawBitmap(bitmap, 0, 0);
52
53        {
54            // Do some subset drawing. This will test that an SkGPipe properly
55            // handles the case where bitmaps share a pixelref
56            // Draw the bottom right fourth of the bitmap over the top left
57            SkBitmap subset;
58            bitmap.extractSubset(&subset, SkIRect::MakeXYWH(x, y, x, y));
59            canvas->drawBitmap(subset, 0, 0);
60            // Draw the top left corner over the bottom right
61            bitmap.extractSubset(&subset, SkIRect::MakeWH(x, y));
62            canvas->drawBitmap(subset, SkIntToScalar(x), SkIntToScalar(y));
63            // Draw a subset which has the same height and pixelref offset but a
64            // different width
65            bitmap.extractSubset(&subset, SkIRect::MakeWH(x, bitmap.height()));
66            SkAutoCanvasRestore autoRestore(canvas, true);
67            canvas->translate(0, SkIntToScalar(bitmap.height() + 20));
68            canvas->drawBitmap(subset, 0, 0);
69            // Now draw a subet which has the same width and pixelref offset but
70            // a different height
71            bitmap.extractSubset(&subset, SkIRect::MakeWH(bitmap.height(), y));
72            canvas->translate(0, SkIntToScalar(bitmap.height() + 20));
73            canvas->drawBitmap(subset, 0, 0);
74        }
75/*
76        // Now do the same but with a device bitmap as source image
77        SkRefPtr<SkDevice> primaryDevice(canvas->getDevice());
78        SkRefPtr<SkDevice> secondDevice(canvas->createCompatibleDevice(
79            SkBitmap::kARGB_8888_Config, bitmap.width(),
80            bitmap.height(), true));
81        secondDevice->unref();
82        SkCanvas secondCanvas(secondDevice.get());
83        secondCanvas.writePixels(bitmap, 0, 0);
84
85        SkBitmap deviceBitmap = secondDevice->accessBitmap(false);
86        SkBitmap deviceSubset;
87        deviceBitmap.extractSubset(&deviceSubset,
88             SkIRect::MakeXYWH(x, y, x, y));
89
90        canvas->translate(SkIntToScalar(120), SkIntToScalar(0));
91
92        canvas->drawBitmap(deviceBitmap, 0, 0);
93        canvas->drawBitmap(deviceSubset, 0, 0);
94*/
95    }
96
97private:
98    typedef GM INHERITED;
99};
100
101//////////////////////////////////////////////////////////////////////////////
102
103static GM* MyFactory(void*) { return new ExtractBitmapGM; }
104static GMRegistry reg(MyFactory);
105
106}
107