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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SkPDFGraphicState_DEFINED
#define SkPDFGraphicState_DEFINED
#include "SkPaint.h"
#include "SkPDFTypes.h"
#include "SkTemplates.h"
#include "SkThread.h"
/** \class SkPDFGraphicState
SkPaint objects roughly correspond to graphic state dictionaries that can
be installed. So that a given dictionary is only output to the pdf file
once, we want to canonicalize them. Static methods in this class manage
a weakly referenced set of SkPDFGraphicState objects: when the last
reference to a SkPDFGraphicState is removed, it removes itself from the
static set of objects.
*/
class SkPDFGraphicState : public SkPDFDict {
public:
virtual ~SkPDFGraphicState();
// Override emitObject and getOutputSize so that we can populate
// the dictionary on demand.
virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog,
bool indirect);
virtual size_t getOutputSize(SkPDFCatalog* catalog, bool indirect);
/** Get the graphic state for the passed SkPaint. The reference count of
* the object is incremented and it is the caller's responsibility to
* unreference it when done. This is needed to accommodate the weak
* reference pattern used when the returned object is new and has no
* other references.
* @param paint The SkPaint to emulate.
*/
static SkPDFGraphicState* getGraphicStateForPaint(const SkPaint& paint);
private:
const SkPaint fPaint;
bool fPopulated;
class GSCanonicalEntry {
public:
SkPDFGraphicState* fGraphicState;
const SkPaint* fPaint;
bool operator==(const GSCanonicalEntry& b) const;
explicit GSCanonicalEntry(SkPDFGraphicState* gs)
: fGraphicState(gs),
fPaint(&gs->fPaint) {}
explicit GSCanonicalEntry(const SkPaint* paint) : fPaint(paint) {}
};
// This should be made a hash table if performance is a problem.
static SkTDArray<GSCanonicalEntry>& canonicalPaints();
static SkMutex& canonicalPaintsMutex();
explicit SkPDFGraphicState(const SkPaint& paint);
void populateDict();
static int find(const SkPaint& paint);
};
#endif
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