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 
8 #include "gm.h"
9 #include "SkBitmap.h"
10 #include "SkCanvas.h"
11 #include "SkString.h"
12 #include "SkSurface.h"
13 
14 namespace skiagm {
15 
16 static void create_bitmap(SkBitmap* bitmap) {
17     const int W = 100;
18     const int H = 100;
19     bitmap->allocN32Pixels(W, H);
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 ExtractBitmapGM : public GM {
29 public:
30     ExtractBitmapGM() {}
31 
32 protected:
33     // overrides from SkEventSink
34     SkString onShortName() override {
35         return SkString("extractbitmap");
36     }
37 
38     SkISize onISize() override {
39         return SkISize::Make(600, 600);
40     }
41 
42     void onDraw(SkCanvas* canvas) override {
43         SkBitmap bitmap;
44         create_bitmap(&bitmap);
45         int x = bitmap.width() / 2;
46         int y = bitmap.height() / 2;
47 
48         canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
49 
50         canvas->drawBitmap(bitmap, 0, 0);
51 
52         {
53             // Do some subset drawing. This will test that an SkGPipe properly
54             // handles the case where bitmaps share a pixelref
55             // Draw the bottom right fourth of the bitmap over the top left
56             SkBitmap subset;
57             bitmap.extractSubset(&subset, SkIRect::MakeXYWH(x, y, x, y));
58             canvas->drawBitmap(subset, 0, 0);
59             // Draw the top left corner over the bottom right
60             bitmap.extractSubset(&subset, SkIRect::MakeWH(x, y));
61             canvas->drawBitmap(subset, SkIntToScalar(x), SkIntToScalar(y));
62             // Draw a subset which has the same height and pixelref offset but a
63             // different width
64             bitmap.extractSubset(&subset, SkIRect::MakeWH(x, bitmap.height()));
65             SkAutoCanvasRestore autoRestore(canvas, true);
66             canvas->translate(0, SkIntToScalar(bitmap.height() + 20));
67             canvas->drawBitmap(subset, 0, 0);
68             // Now draw a subet which has the same width and pixelref offset but
69             // a different height
70             bitmap.extractSubset(&subset, SkIRect::MakeWH(bitmap.height(), y));
71             canvas->translate(0, SkIntToScalar(bitmap.height() + 20));
72             canvas->drawBitmap(subset, 0, 0);
73         }
74     }
75 
76 private:
77     typedef GM INHERITED;
78 };
79 
80 //////////////////////////////////////////////////////////////////////////////
81 
82 static GM* MyFactory(void*) { return new ExtractBitmapGM; }
83 static GMRegistry reg(MyFactory);
84 
85 }
86