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        static const SkScalar kOffset = 35000.0f;
31        static const SkScalar kExtents = 1000.0f;
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(kExtents, kOffset + kExtents, NULL, 0);
38        rec->drawColor(SK_ColorRED);
39        rec->save();
40        SkRect r = SkRect::MakeXYWH(-kExtents, kOffset - kExtents, 2 * kExtents, 2 * kExtents);
41        SkPath p;
42        p.addRoundRect(r, 5, 5);
43        rec->clipPath(p, SkRegion::kIntersect_Op, true);
44        rec->drawColor(SK_ColorGREEN);
45        rec->restore();
46        SkAutoTUnref<SkPicture> pict(recorder.endRecording());
47
48        // Next we play that picture into another picture of the same size.
49        pict->playback(recorder.beginRecording(pict->cullRect().width(),
50                                               pict->cullRect().height(),
51                                               NULL, 0));
52        SkAutoTUnref<SkPicture> pict2(recorder.endRecording());
53
54        // Finally we play the part of that second picture that should be green into the canvas.
55        canvas->save();
56        canvas->translate(kExtents / 2, -(kOffset - kExtents / 2));
57        pict2->playback(canvas);
58        canvas->restore();
59
60        // If the image is red, we erroneously decided the clipPath was empty and didn't record
61        // the green drawColor, if it's green we're all good.
62    }
63
64private:
65    typedef GM INHERITED;
66};
67
68///////////////////////////////////////////////////////////////////////////////
69
70static GM* MyFactory(void*) { return new DistantClipGM; }
71static GMRegistry reg(MyFactory);
72
73}
74