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102 lines
3.4 KiB
C
102 lines
3.4 KiB
C
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/*
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* Copyright 2010 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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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 SkPDFFormXObject;
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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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virtual void getResources(SkTDArray<SkPDFObject*>* resourceList);
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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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/** Make a graphic state that only sets the passed soft mask. The
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* reference count of the object is incremented and it is the caller's
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* responsibility to unreference it when done.
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* @param sMask The form xobject to use as a soft mask.
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* @param invert Indicates if the alpha of the sMask should be inverted.
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*/
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static SkPDFGraphicState* GetSMaskGraphicState(SkPDFFormXObject* sMask,
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bool invert);
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/** Get a graphic state that only unsets the soft mask. The reference
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* count of the object is incremented and it is the caller's responsibility
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* to 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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*/
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static SkPDFGraphicState* GetNoSMaskGraphicState();
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private:
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const SkPaint fPaint;
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SkTDArray<SkPDFObject*> fResources;
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bool fPopulated;
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bool fSMask;
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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)
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: fGraphicState(NULL),
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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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SkPDFGraphicState();
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explicit SkPDFGraphicState(const SkPaint& paint);
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void populateDict();
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static SkPDFObject* GetInvertFunction();
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static int Find(const SkPaint& paint);
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};
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#endif
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