909994fbae
This technique geometrically clips all segments against the clip bounds, ensuring that we never send a value to the edgelist that might overflow in fixedpoint. Current disabled in SkScan_Path.cpp by a #define. There are a few minor pixel differences between this and the old technique, as found by the gm tool, so at the moment this new code is off by default. git-svn-id: http://skia.googlecode.com/svn/trunk@432 2bbb7eff-a529-9590-31e7-b0007b416f81
59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SkEdgeClipper_DEFINED
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#define SkEdgeClipper_DEFINED
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#include "SkPath.h"
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/** This is basically an iterator. It is initialized with an edge and a clip,
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and then next() is called until it returns kDone_Verb.
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*/
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class SkEdgeClipper {
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public:
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bool clipQuad(const SkPoint pts[3], const SkRect& clip);
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bool clipCubic(const SkPoint pts[4], const SkRect& clip);
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SkPath::Verb next(SkPoint pts[]);
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private:
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SkPoint* fCurrPoint;
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SkPath::Verb* fCurrVerb;
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enum {
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kMaxVerbs = 13,
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kMaxPoints = 32
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};
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SkPoint fPoints[kMaxPoints];
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SkPath::Verb fVerbs[kMaxVerbs];
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void clipMonoQuad(const SkPoint srcPts[3], const SkRect& clip);
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void clipMonoCubic(const SkPoint srcPts[4], const SkRect& clip);
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void appendVLine(SkScalar x, SkScalar y0, SkScalar y1, bool reverse);
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void appendQuad(const SkPoint pts[3], bool reverse);
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void appendCubic(const SkPoint pts[4], bool reverse);
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};
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#ifdef SK_DEBUG
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void sk_assert_monotonic_x(const SkPoint pts[], int count);
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void sk_assert_monotonic_y(const SkPoint pts[], int count);
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#else
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#define sk_assert_monotonic_x(pts, count)
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#define sk_assert_monotonic_y(pts, count)
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#endif
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#endif
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