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 "SkPicture.h"
12 #include "SkPictureRecorder.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 SkISize::Make(100, 100); }
27
onDraw(SkCanvas * canvas)28 virtual void onDraw(SkCanvas* canvas) {
29 constexpr SkScalar kOffset = 35000.0f;
30 constexpr SkScalar kExtents = 1000.0f;
31
32 SkPictureRecorder recorder;
33 // We record a picture of huge vertical extents in which we clear the canvas to red, create
34 // a 'extents' by 'extents' round rect clip at a vertical offset of 'offset', then draw
35 // green into that.
36 SkCanvas* rec = recorder.beginRecording(kExtents, kOffset + kExtents, nullptr, 0);
37 rec->drawColor(SK_ColorRED);
38 rec->save();
39 SkRect r = SkRect::MakeXYWH(-kExtents, kOffset - kExtents, 2 * kExtents, 2 * kExtents);
40 SkPath p;
41 p.addRoundRect(r, 5, 5);
42 rec->clipPath(p, true);
43 rec->drawColor(SK_ColorGREEN);
44 rec->restore();
45 sk_sp<SkPicture> pict(recorder.finishRecordingAsPicture());
46
47 // Next we play that picture into another picture of the same size.
48 pict->playback(recorder.beginRecording(pict->cullRect().width(),
49 pict->cullRect().height(),
50 nullptr, 0));
51 sk_sp<SkPicture> pict2(recorder.finishRecordingAsPicture());
52
53 // Finally we play the part of that second picture that should be green into the canvas.
54 canvas->save();
55 canvas->translate(kExtents / 2, -(kOffset - kExtents / 2));
56 pict2->playback(canvas);
57 canvas->restore();
58
59 // If the image is red, we erroneously decided the clipPath was empty and didn't record
60 // the green drawColor, if it's green we're all good.
61 }
62
63 private:
64 typedef GM INHERITED;
65 };
66
67 ///////////////////////////////////////////////////////////////////////////////
68
MyFactory(void *)69 static GM* MyFactory(void*) { return new DistantClipGM; }
70 static GMRegistry reg(MyFactory);
71
72 }
73