1 /*
2 * Copyright 2014 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 "SkRegion.h"
10
11 // This GM exercises the use case found in crbug.com/423834.
12 // The following pattern:
13 // save();
14 // clipRect(rect, noAA);
15 // drawRect(bigRect, noAA);
16 // restore();
17 //
18 // drawRect(rect, noAA);
19 // can leave 1 pixel wide remnants of the first rect.
Draw(SkCanvas * canvas,const SkRect & rect)20 static void Draw(SkCanvas* canvas, const SkRect& rect) {
21 SkPaint p;
22 p.setAntiAlias(false);
23
24 const SkRect bigRect = SkRect::MakeWH(600, 600);
25
26 canvas->save();
27 // draw a black rect through the clip
28 canvas->save();
29 canvas->clipRect(rect);
30 canvas->drawRect(bigRect, p);
31 canvas->restore();
32
33 // now draw the white rect on top
34 p.setColor(SK_ColorWHITE);
35 canvas->drawRect(rect, p);
36 canvas->restore();
37 }
38
39 DEF_SIMPLE_GM_BG(clipdrawdraw, canvas, 512, 512, 0xFFCCCCCC) {
40 // Vertical remnant
41 const SkRect rect1 = SkRect::MakeLTRB(136.5f, 137.5f, 338.5f, 293.5f);
42
43 // Horizontal remnant
44 // 179.488 rounds the right way (i.e., 179), 179.499 rounds the wrong way (i.e., 180)
45 const SkRect rect2 = SkRect::MakeLTRB(207.5f, 179.499f, 530.5f, 429.5f);
46
47 Draw(canvas, rect1);
48 Draw(canvas, rect2);
49 }
50
51 ///////////////////////////////////////////////////////////////////////////////////////////////////
52
53 DEF_SIMPLE_GM(clip_region, canvas, 256, 256) {
54 SkRegion rgn({ 10, 10, 100, 100 });
55
56 canvas->save();
57 canvas->clipRegion(rgn);
58 canvas->drawColor(SK_ColorRED);
59 canvas->restore();
60
61 SkRect bounds = { 30, 30, 80, 80 };
62 canvas->saveLayer(&bounds, nullptr);
63 canvas->clipRegion(rgn);
64 canvas->drawColor(SK_ColorBLUE);
65 canvas->restore();
66 }
67