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 "sk_tool_utils.h"
10 #include "SkRegion.h"
11 
12 // This GM exercises the use case found in crbug.com/423834.
13 // The following pattern:
14 //    save();
15 //    clipRect(rect, noAA);
16 //    drawRect(bigRect, noAA);
17 //    restore();
18 //
19 //    drawRect(rect, noAA);
20 // can leave 1 pixel wide remnants of the first rect.
21 static void Draw(SkCanvas* canvas, const SkRect& rect) {
22         SkPaint p;
23         p.setAntiAlias(false);
24 
25         const SkRect bigRect = SkRect::MakeWH(600, 600);
26 
27         canvas->save();
28             // draw a black rect through the clip
29             canvas->save();
30                 canvas->clipRect(rect);
31                 canvas->drawRect(bigRect, p);
32             canvas->restore();
33 
34             // now draw the white rect on top
35             p.setColor(SK_ColorWHITE);
36             canvas->drawRect(rect, p);
37         canvas->restore();
38 }
39 
40 DEF_SIMPLE_GM_BG(clipdrawdraw, canvas, 512, 512,
41                  sk_tool_utils::color_to_565(0xFFCCCCCC)) {
42         // Vertical remnant
43         const SkRect rect1 = SkRect::MakeLTRB(136.5f, 137.5f, 338.5f, 293.5f);
44 
45         // Horizontal remnant
46         // 179.488 rounds the right way (i.e., 179), 179.499 rounds the wrong way (i.e., 180)
47         const SkRect rect2 = SkRect::MakeLTRB(207.5f, 179.499f, 530.5f, 429.5f);
48 
49         Draw(canvas, rect1);
50         Draw(canvas, rect2);
51 }
52 
53 ///////////////////////////////////////////////////////////////////////////////////////////////////
54 
55 DEF_SIMPLE_GM(clip_region, canvas, 256, 256) {
56     SkRegion rgn({ 10, 10, 100, 100 });
57 
58     canvas->save();
59     canvas->clipRegion(rgn);
60     canvas->drawColor(SK_ColorRED);
61     canvas->restore();
62 
63     SkRect bounds = { 30, 30, 80, 80 };
64     canvas->saveLayer(&bounds, nullptr);
65     canvas->clipRegion(rgn);
66     canvas->drawColor(SK_ColorBLUE);
67     canvas->restore();
68 }
69