mirror of https://github.com/axmolengine/axmol.git
81 lines
2.7 KiB
C
81 lines
2.7 KiB
C
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/*
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* Copyright (C) 2010 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 SkPDFGraphicState_DEFINED
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#define SkPDFGraphicState_DEFINED
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#include "SkPaint.h"
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#include "SkPDFTypes.h"
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#include "SkTemplates.h"
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#include "SkThread.h"
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/** \class SkPDFGraphicState
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SkPaint objects roughly correspond to graphic state dictionaries that can
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be installed. So that a given dictionary is only output to the pdf file
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once, we want to canonicalize them. Static methods in this class manage
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a weakly referenced set of SkPDFGraphicState objects: when the last
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reference to a SkPDFGraphicState is removed, it removes itself from the
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static set of objects.
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*/
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class SkPDFGraphicState : public SkPDFDict {
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public:
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virtual ~SkPDFGraphicState();
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// Override emitObject and getOutputSize so that we can populate
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// the dictionary on demand.
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virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog,
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bool indirect);
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virtual size_t getOutputSize(SkPDFCatalog* catalog, bool indirect);
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/** Get the graphic state for the passed SkPaint. The reference count of
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* the object is incremented and it is the caller's responsibility to
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* unreference it when done. This is needed to accommodate the weak
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* reference pattern used when the returned object is new and has no
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* other references.
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* @param paint The SkPaint to emulate.
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*/
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static SkPDFGraphicState* getGraphicStateForPaint(const SkPaint& paint);
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private:
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const SkPaint fPaint;
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bool fPopulated;
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class GSCanonicalEntry {
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public:
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SkPDFGraphicState* fGraphicState;
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const SkPaint* fPaint;
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bool operator==(const GSCanonicalEntry& b) const;
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explicit GSCanonicalEntry(SkPDFGraphicState* gs)
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: fGraphicState(gs),
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fPaint(&gs->fPaint) {}
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explicit GSCanonicalEntry(const SkPaint* paint) : fPaint(paint) {}
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};
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// This should be made a hash table if performance is a problem.
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static SkTDArray<GSCanonicalEntry>& canonicalPaints();
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static SkMutex& canonicalPaintsMutex();
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explicit SkPDFGraphicState(const SkPaint& paint);
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void populateDict();
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static int find(const SkPaint& paint);
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};
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#endif
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