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/gm.h"
9 #include "include/core/SkBitmap.h"
10 #include "include/core/SkCanvas.h"
11 #include "include/core/SkColor.h"
12 #include "include/core/SkPaint.h"
13 #include "include/core/SkRect.h"
14 #include "include/core/SkScalar.h"
15 #include "include/core/SkSize.h"
16 #include "include/core/SkString.h"
17
18 namespace skiagm {
19
create_bitmap(SkBitmap * bitmap)20 static void create_bitmap(SkBitmap* bitmap) {
21 const int W = 100;
22 const int H = 100;
23 bitmap->allocN32Pixels(W, H);
24
25 SkCanvas canvas(*bitmap);
26 canvas.drawColor(SK_ColorRED);
27 SkPaint paint;
28 paint.setColor(SK_ColorBLUE);
29 canvas.drawCircle(SkIntToScalar(W)/2, SkIntToScalar(H)/2, SkIntToScalar(W)/2, paint);
30 }
31
32 class ExtractBitmapGM : public GM {
33 public:
ExtractBitmapGM()34 ExtractBitmapGM() {}
35
36 protected:
onShortName()37 SkString onShortName() override {
38 return SkString("extractbitmap");
39 }
40
onISize()41 SkISize onISize() override {
42 return SkISize::Make(600, 600);
43 }
44
onDraw(SkCanvas * canvas)45 void onDraw(SkCanvas* canvas) override {
46 SkBitmap bitmap;
47 create_bitmap(&bitmap);
48 int x = bitmap.width() / 2;
49 int y = bitmap.height() / 2;
50
51 canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
52
53 canvas->drawBitmap(bitmap, 0, 0);
54
55 {
56 // Do some subset drawing. This will test that an SkGPipe properly
57 // handles the case where bitmaps share a pixelref
58 // Draw the bottom right fourth of the bitmap over the top left
59 SkBitmap subset;
60 bitmap.extractSubset(&subset, SkIRect::MakeXYWH(x, y, x, y));
61 canvas->drawBitmap(subset, 0, 0);
62 // Draw the top left corner over the bottom right
63 bitmap.extractSubset(&subset, SkIRect::MakeWH(x, y));
64 canvas->drawBitmap(subset, SkIntToScalar(x), SkIntToScalar(y));
65 // Draw a subset which has the same height and pixelref offset but a
66 // different width
67 bitmap.extractSubset(&subset, SkIRect::MakeWH(x, bitmap.height()));
68 SkAutoCanvasRestore autoRestore(canvas, true);
69 canvas->translate(0, SkIntToScalar(bitmap.height() + 20));
70 canvas->drawBitmap(subset, 0, 0);
71 // Now draw a subet which has the same width and pixelref offset but
72 // a different height
73 bitmap.extractSubset(&subset, SkIRect::MakeWH(bitmap.height(), y));
74 canvas->translate(0, SkIntToScalar(bitmap.height() + 20));
75 canvas->drawBitmap(subset, 0, 0);
76 }
77 }
78
79 private:
80 using INHERITED = GM;
81 };
82
83 //////////////////////////////////////////////////////////////////////////////
84
85 DEF_GM( return new ExtractBitmapGM; )
86
87 } // namespace skiagm
88