5aaa69e433
Review URL http://codereview.appspot.com/4250056/ git-svn-id: http://skia.googlecode.com/svn/trunk@891 2bbb7eff-a529-9590-31e7-b0007b416f81
71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
/*
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Copyright 2010 Google Inc.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 GrPathIter_DEFINED
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#define GrPathIter_DEFINED
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#include "GrTypes.h"
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struct GrPoint;
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/**
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2D Path iterator. Porting layer creates a subclass of this. It allows Ganesh to
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parse the top-level API's 2D paths. Supports lines, quadratics, and cubic
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pieces and moves (multi-part paths).
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*/
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class GrPathIter {
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public:
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virtual ~GrPathIter() {};
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/**
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* Iterates through the path. Should not be called after
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* kEnd_Command has been returned once. This version retrieves the
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* points for the command.
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* @param points The points relevant to returned commend. See Command
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* enum for number of points valid for each command.
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* @return The next command of the path.
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*/
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virtual GrPathCmd next(GrPoint points[4]) = 0;
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/**
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* If the host API has knowledge of the convexity of the path
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* it can be communicated by this hint. Gr can analyze the path
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* as it is iterated. So it is not necessary to do additional work to
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* compute convexity status if it isn't already determined.
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*
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* @return a hint about the convexity of the path.
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*/
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virtual GrConvexHint convexHint() const { return kNone_ConvexHint; }
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/**
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* Iterates through the path. Should not be called after
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* kEnd_Command has been returned once. This version does not retrieve the
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* points for the command.
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* @return The next command of the path.
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*/
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virtual GrPathCmd next() = 0;
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/**
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Restarts iteration from the beginning.
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*/
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virtual void rewind() = 0;
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};
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#endif
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