1
2 /*
3 * Copyright 2012 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9 #include "gm.h"
10 #include "SkCanvas.h"
11 #include "SkPath.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 constexpr SkScalar kOffset = 35000.0f;
31 constexpr 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, nullptr, 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, true);
44 rec->drawColor(SK_ColorGREEN);
45 rec->restore();
46 sk_sp<SkPicture> pict(recorder.finishRecordingAsPicture());
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 nullptr, 0));
52 sk_sp<SkPicture> pict2(recorder.finishRecordingAsPicture());
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
64 private:
65 typedef GM INHERITED;
66 };
67
68 ///////////////////////////////////////////////////////////////////////////////
69
MyFactory(void *)70 static GM* MyFactory(void*) { return new DistantClipGM; }
71 static GMRegistry reg(MyFactory);
72
73 }
74