1 | // Copyright 2013 The Flutter Authors. All rights reserved. |
2 | // Use of this source code is governed by a BSD-style license that can be |
3 | // found in the LICENSE file. |
4 | |
5 | #include "flutter/flow/paint_utils.h" |
6 | |
7 | #include <stdlib.h> |
8 | |
9 | #include "third_party/skia/include/core/SkBitmap.h" |
10 | #include "third_party/skia/include/core/SkPaint.h" |
11 | #include "third_party/skia/include/core/SkShader.h" |
12 | |
13 | namespace flutter { |
14 | |
15 | namespace { |
16 | |
17 | sk_sp<SkShader> CreateCheckerboardShader(SkColor c1, SkColor c2, int size) { |
18 | SkBitmap bm; |
19 | bm.allocN32Pixels(2 * size, 2 * size); |
20 | bm.eraseColor(c1); |
21 | bm.eraseArea(SkIRect::MakeLTRB(0, 0, size, size), c2); |
22 | bm.eraseArea(SkIRect::MakeLTRB(size, size, 2 * size, 2 * size), c2); |
23 | return bm.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat); |
24 | } |
25 | |
26 | } // anonymous namespace |
27 | |
28 | void DrawCheckerboard(SkCanvas* canvas, SkColor c1, SkColor c2, int size) { |
29 | SkPaint paint; |
30 | paint.setShader(CreateCheckerboardShader(c1, c2, size)); |
31 | canvas->drawPaint(paint); |
32 | } |
33 | |
34 | void DrawCheckerboard(SkCanvas* canvas, const SkRect& rect) { |
35 | // Draw a checkerboard |
36 | canvas->save(); |
37 | canvas->clipRect(rect); |
38 | |
39 | auto checkerboard_color = |
40 | SkColorSetARGB(64, rand() % 256, rand() % 256, rand() % 256); |
41 | |
42 | DrawCheckerboard(canvas, checkerboard_color, 0x00000000, 12); |
43 | canvas->restore(); |
44 | |
45 | // Stroke the drawn area |
46 | SkPaint debugPaint; |
47 | debugPaint.setStrokeWidth(8); |
48 | debugPaint.setColor(SkColorSetA(checkerboard_color, 255)); |
49 | debugPaint.setStyle(SkPaint::kStroke_Style); |
50 | canvas->drawRect(rect, debugPaint); |
51 | } |
52 | |
53 | } // namespace flutter |
54 | |