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
14 namespace skiagm {
15
16 class DistantClipGM : public GM {
17 public:
DistantClipGM()18 DistantClipGM() { }
19
20 protected:
21
onShortName()22 SkString onShortName() {
23 return SkString("distantclip");
24 }
25
onISize()26 SkISize onISize() { return make_isize(100, 100); }
27
onDraw(SkCanvas * canvas)28 virtual void onDraw(SkCanvas* canvas) {
29 int offset = 35000;
30 int extents = 1000;
31
32 // We record a picture of huge vertical extents in which we clear the canvas to red, create
33 // a 'extents' by 'extents' round rect clip at a vertical offset of 'offset', then draw
34 // green into that.
35 SkPicture pict;
36 SkCanvas* rec = pict.beginRecording(100, offset + extents);
37 rec->drawColor(0xffff0000);
38 rec->save();
39 SkRect r = {
40 SkIntToScalar(-extents),
41 SkIntToScalar(offset - extents),
42 SkIntToScalar(extents),
43 SkIntToScalar(offset + extents)
44 };
45 SkPath p;
46 p.addRoundRect(r, 5, 5);
47 rec->clipPath(p, SkRegion::kIntersect_Op, true);
48 rec->drawColor(0xff00ff00);
49 rec->restore();
50 pict.endRecording();
51
52 // Next we play that picture into another picture of the same size.
53 SkPicture pict2;
54 pict.draw(pict2.beginRecording(100, offset + extents));
55 pict2.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