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
15namespace skiagm {
16
17class DistantClipGM : public GM {
18public:
19    DistantClipGM() { }
20
21protected:
22
23    SkString onShortName() {
24        return SkString("distantclip");
25    }
26
27    SkISize onISize() { return SkISize::Make(100, 100); }
28
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
68private:
69    typedef GM INHERITED;
70};
71
72///////////////////////////////////////////////////////////////////////////////
73
74static GM* MyFactory(void*) { return new DistantClipGM; }
75static GMRegistry reg(MyFactory);
76
77}
78