dbfd7ab108
'static const' means, there must be at most one of these, and initialize it at compile time if possible or runtime if necessary. This leads to unexpected code execution, and TSAN* will complain about races on the guard variables. Generally 'constexpr' or 'const' are better choices. Neither can cause races: they're either intialized at compile time (constexpr) or intialized each time independently (const). This CL prefers constexpr where possible, and uses const where not. It even prefers constexpr over const where they don't make a difference... I want to have lots of examples of constexpr for people to see and mimic. The scoped-to-class static has nothing to do with any of this, and is not changed. * Not yet on the bots, which use an older TSAN. BUG=skia: GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2300623005 Review-Url: https://codereview.chromium.org/2300623005
73 lines
2.3 KiB
C++
73 lines
2.3 KiB
C++
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/*
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* Copyright 2012 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm.h"
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#include "SkCanvas.h"
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#include "SkPicture.h"
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#include "SkPictureRecorder.h"
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namespace skiagm {
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class DistantClipGM : public GM {
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public:
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DistantClipGM() { }
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protected:
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SkString onShortName() {
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return SkString("distantclip");
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}
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SkISize onISize() { return SkISize::Make(100, 100); }
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virtual void onDraw(SkCanvas* canvas) {
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constexpr SkScalar kOffset = 35000.0f;
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constexpr SkScalar kExtents = 1000.0f;
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SkPictureRecorder recorder;
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// We record a picture of huge vertical extents in which we clear the canvas to red, create
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// a 'extents' by 'extents' round rect clip at a vertical offset of 'offset', then draw
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// green into that.
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SkCanvas* rec = recorder.beginRecording(kExtents, kOffset + kExtents, nullptr, 0);
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rec->drawColor(SK_ColorRED);
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rec->save();
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SkRect r = SkRect::MakeXYWH(-kExtents, kOffset - kExtents, 2 * kExtents, 2 * kExtents);
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SkPath p;
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p.addRoundRect(r, 5, 5);
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rec->clipPath(p, SkRegion::kIntersect_Op, true);
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rec->drawColor(SK_ColorGREEN);
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rec->restore();
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sk_sp<SkPicture> pict(recorder.finishRecordingAsPicture());
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// Next we play that picture into another picture of the same size.
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pict->playback(recorder.beginRecording(pict->cullRect().width(),
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pict->cullRect().height(),
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nullptr, 0));
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sk_sp<SkPicture> pict2(recorder.finishRecordingAsPicture());
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// Finally we play the part of that second picture that should be green into the canvas.
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canvas->save();
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canvas->translate(kExtents / 2, -(kOffset - kExtents / 2));
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pict2->playback(canvas);
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canvas->restore();
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// If the image is red, we erroneously decided the clipPath was empty and didn't record
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// the green drawColor, if it's green we're all good.
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}
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private:
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typedef GM INHERITED;
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};
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///////////////////////////////////////////////////////////////////////////////
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static GM* MyFactory(void*) { return new DistantClipGM; }
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static GMRegistry reg(MyFactory);
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}
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