145 lines
4.6 KiB
C++
145 lines
4.6 KiB
C++
/*
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* Copyright (C) 2006 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 SkPathEffect_DEFINED
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#define SkPathEffect_DEFINED
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#include "SkFlattenable.h"
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class SkPath;
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/** \class SkPathEffect
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SkPathEffect is the base class for objects in the SkPaint that affect
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the geometry of a drawing primitive before it is transformed by the
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canvas' matrix and drawn.
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Dashing is implemented as a subclass of SkPathEffect.
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*/
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class SkPathEffect : public SkFlattenable {
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public:
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// This method is not exported to java.
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SkPathEffect() {}
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/** Given a src path and a width value, return true if the patheffect
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has produced a new path (dst) and a new width value. If false is returned,
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ignore dst and width.
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On input, width >= 0 means the src should be stroked
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On output, width >= 0 means the dst should be stroked
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*/
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virtual bool filterPath(SkPath* dst, const SkPath& src, SkScalar* width) = 0;
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private:
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// illegal
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SkPathEffect(const SkPathEffect&);
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SkPathEffect& operator=(const SkPathEffect&);
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};
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/** \class SkPairPathEffect
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Common baseclass for Compose and Sum. This subclass manages two pathEffects,
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including flattening them. It does nothing in filterPath, and is only useful
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for managing the lifetimes of its two arguments.
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*/
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class SkPairPathEffect : public SkPathEffect {
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public:
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SkPairPathEffect(SkPathEffect* pe0, SkPathEffect* pe1);
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virtual ~SkPairPathEffect();
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protected:
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SkPairPathEffect(SkFlattenableReadBuffer&);
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virtual void flatten(SkFlattenableWriteBuffer&);
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// these are visible to our subclasses
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SkPathEffect* fPE0, *fPE1;
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private:
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typedef SkPathEffect INHERITED;
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};
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/** \class SkComposePathEffect
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This subclass of SkPathEffect composes its two arguments, to create
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a compound pathEffect.
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*/
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class SkComposePathEffect : public SkPairPathEffect {
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public:
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/** Construct a pathEffect whose effect is to apply first the inner pathEffect
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and the the outer pathEffect (e.g. outer(inner(path)))
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The reference counts for outer and inner are both incremented in the constructor,
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and decremented in the destructor.
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*/
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SkComposePathEffect(SkPathEffect* outer, SkPathEffect* inner)
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: INHERITED(outer, inner) {}
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// overrides
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// This method is not exported to java.
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virtual bool filterPath(SkPath* dst, const SkPath& src, SkScalar* width);
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protected:
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virtual Factory getFactory() { return CreateProc; }
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private:
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static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) {
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return SkNEW_ARGS(SkComposePathEffect, (buffer));
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}
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SkComposePathEffect(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {}
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// illegal
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SkComposePathEffect(const SkComposePathEffect&);
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SkComposePathEffect& operator=(const SkComposePathEffect&);
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typedef SkPairPathEffect INHERITED;
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};
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/** \class SkSumPathEffect
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This subclass of SkPathEffect applies two pathEffects, one after the other.
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Its filterPath() returns true if either of the effects succeeded.
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*/
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class SkSumPathEffect : public SkPairPathEffect {
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public:
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/** Construct a pathEffect whose effect is to apply two effects, in sequence.
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(e.g. first(path) + second(path))
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The reference counts for first and second are both incremented in the constructor,
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and decremented in the destructor.
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*/
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SkSumPathEffect(SkPathEffect* first, SkPathEffect* second)
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: INHERITED(first, second) {}
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// overrides
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// This method is not exported to java.
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virtual bool filterPath(SkPath* dst, const SkPath& src, SkScalar* width);
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protected:
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virtual Factory getFactory() { return CreateProc; }
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private:
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static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) {
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return SkNEW_ARGS(SkSumPathEffect, (buffer));
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}
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SkSumPathEffect(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {}
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// illegal
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SkSumPathEffect(const SkSumPathEffect&);
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SkSumPathEffect& operator=(const SkSumPathEffect&);
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typedef SkPairPathEffect INHERITED;
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};
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#endif
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