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
create_bitmap(SkBitmap * bitmap)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:
ExtractBitmapGM()30 ExtractBitmapGM() {}
31
32 protected:
33 // overrides from SkEventSink
onShortName()34 SkString onShortName() override {
35 return SkString("extractbitmap");
36 }
37
onISize()38 SkISize onISize() override {
39 return SkISize::Make(600, 600);
40 }
41
onDraw(SkCanvas * canvas)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
MyFactory(void *)82 static GM* MyFactory(void*) { return new ExtractBitmapGM; }
83 static GMRegistry reg(MyFactory);
84
85 }
86