0038b7feaa
BUG=skia: GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4769 Change-Id: Ie70bdc280c680c82f3b8a186466bf3a0835a9107 Reviewed-on: https://skia-review.googlesource.com/4769 Reviewed-by: Cary Clark <caryclark@google.com> Commit-Queue: Yuqian Li <liyuqian@google.com>
85 lines
2.7 KiB
C++
85 lines
2.7 KiB
C++
/*
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* Copyright 2014 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 "SkPath.h"
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#include "SkScan.h"
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#define W 800
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#define H 800
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class AnalyticAntiAliasConvexGM : public skiagm::GM {
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public:
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AnalyticAntiAliasConvexGM() {}
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protected:
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SkString onShortName() override {
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return SkString("analytic_antialias_convex");
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}
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SkISize onISize() override {
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return SkISize::Make(W, H);
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}
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void onDraw(SkCanvas* canvas) override {
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SkPaint p;
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p.setColor(SK_ColorRED);
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p.setAntiAlias(true);
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canvas->clear(0xFFFFFFFF);
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canvas->save();
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SkScalar y = 0;
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canvas->translate(0, y);
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canvas->rotate(1);
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canvas->drawRectCoords(20, 20, 200, 200, p);
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canvas->restore();
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y += 200;
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canvas->translate(0, y);
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canvas->rotate(1);
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canvas->drawRectCoords(20, 20, 20.2f, 200, p);
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canvas->drawRectCoords(20, 200, 200, 200.1f, p);
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canvas->drawCircle(100, 100, 30, p);
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canvas->restore();
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// The following path is empty but it'll reveal bug chrome:662914
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SkPath path;
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path.moveTo(SkBits2Float(0x429b9d5c), SkBits2Float(0x4367a041)); // 77.8073f, 231.626f
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// 77.8075f, 231.626f, 77.8074f, 231.625f, 77.8073f, 231.625f
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path.cubicTo(SkBits2Float(0x429b9d71), SkBits2Float(0x4367a022),
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SkBits2Float(0x429b9d64), SkBits2Float(0x4367a009),
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SkBits2Float(0x429b9d50), SkBits2Float(0x43679ff2));
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path.lineTo(SkBits2Float(0x429b9d5c), SkBits2Float(0x4367a041)); // 77.8073f, 231.626f
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path.close();
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canvas->drawPath(path, p);
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// The following path reveals a subtle SkAnalyticQuadraticEdge::updateQuadratic bug:
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// we should not use any snapped y for the intermediate values whose error may accumulate;
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// snapping should only be allowed once before updateLine.
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path.reset();
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path.moveTo(SkBits2Float(0x434ba71e), SkBits2Float(0x438a06d0)); // 203.653f, 276.053f
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path.lineTo(SkBits2Float(0x43492a74), SkBits2Float(0x4396d70d)); // 201.166f, 301.68f
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// 200.921f, 304.207f, 196.939f, 303.82f, 0.707107f
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path.conicTo(SkBits2Float(0x4348ebaf), SkBits2Float(0x43981a75),
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SkBits2Float(0x4344f079), SkBits2Float(0x4397e900), SkBits2Float(0x3f3504f3));
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path.close();
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// Manually setting convexity is required. Otherwise, this path will be considered concave.
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path.setConvexity(SkPath::kConvex_Convexity);
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canvas->drawPath(path, p);
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}
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private:
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typedef skiagm::GM INHERITED;
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};
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DEF_GM( return new AnalyticAntiAliasConvexGM; )
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