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1 
2 
3 /*
4  * Copyright 2012 Google Inc.
5  *
6  * Use of this source code is governed by a BSD-style license that can be
7  * found in the LICENSE file.
8  */
9 
10 #include "gm.h"
11 #include "SkCanvas.h"
12 #include "SkPicture.h"
13 #include "SkPictureRecorder.h"
14 
15 namespace skiagm {
16 
17 class DistantClipGM : public GM {
18 public:
DistantClipGM()19     DistantClipGM() { }
20 
21 protected:
22 
onShortName()23     SkString onShortName() {
24         return SkString("distantclip");
25     }
26 
onISize()27     SkISize onISize() { return SkISize::Make(100, 100); }
28 
onDraw(SkCanvas * canvas)29     virtual void onDraw(SkCanvas* canvas) {
30         int offset = 35000;
31         int extents = 1000;
32 
33         SkPictureRecorder recorder;
34         // We record a picture of huge vertical extents in which we clear the canvas to red, create
35         // a 'extents' by 'extents' round rect clip at a vertical offset of 'offset', then draw
36         // green into that.
37         SkCanvas* rec = recorder.beginRecording(100, offset + extents, NULL, 0);
38         rec->drawColor(0xffff0000);
39         rec->save();
40         SkRect r = {
41             SkIntToScalar(-extents),
42             SkIntToScalar(offset - extents),
43             SkIntToScalar(extents),
44             SkIntToScalar(offset + extents)
45         };
46         SkPath p;
47         p.addRoundRect(r, 5, 5);
48         rec->clipPath(p, SkRegion::kIntersect_Op, true);
49         rec->drawColor(0xff00ff00);
50         rec->restore();
51         SkAutoTUnref<SkPicture> pict(recorder.endRecording());
52 
53         // Next we play that picture into another picture of the same size.
54         pict->draw(recorder.beginRecording(100, offset + extents, NULL, 0));
55         SkAutoTUnref<SkPicture> pict2(recorder.endRecording());
56 
57         // Finally we play the part of that second picture that should be green into the canvas.
58         canvas->save();
59         canvas->translate(SkIntToScalar(extents / 2),
60                           SkIntToScalar(-(offset - extents / 2)));
61         pict2->draw(canvas);
62         canvas->restore();
63 
64         // If the image is red, we erroneously decided the clipPath was empty and didn't record
65         // the green drawColor, if it's green we're all good.
66     }
67 
68 private:
69     typedef GM INHERITED;
70 };
71 
72 ///////////////////////////////////////////////////////////////////////////////
73 
MyFactory(void *)74 static GM* MyFactory(void*) { return new DistantClipGM; }
75 static GMRegistry reg(MyFactory);
76 
77 }
78