| |
| /* |
| * Copyright 2010 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| |
| #ifndef SkPDFGraphicState_DEFINED |
| #define SkPDFGraphicState_DEFINED |
| |
| #include "SkPaint.h" |
| #include "SkPDFTypes.h" |
| #include "SkTemplates.h" |
| #include "SkThread.h" |
| |
| class SkPDFFormXObject; |
| |
| /** \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(); |
| |
| virtual void getResources(SkTDArray<SkPDFObject*>* resourceList); |
| |
| // 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); |
| |
| /** Make a graphic state that only sets the passed soft mask. The |
| * reference count of the object is incremented and it is the caller's |
| * responsibility to unreference it when done. |
| * @param sMask The form xobject to use as a soft mask. |
| * @param invert Indicates if the alpha of the sMask should be inverted. |
| */ |
| static SkPDFGraphicState* GetSMaskGraphicState(SkPDFFormXObject* sMask, |
| bool invert); |
| |
| /** Get a graphic state that only unsets the soft mask. 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. |
| */ |
| static SkPDFGraphicState* GetNoSMaskGraphicState(); |
| |
| private: |
| const SkPaint fPaint; |
| SkTDArray<SkPDFObject*> fResources; |
| bool fPopulated; |
| bool fSMask; |
| |
| 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) |
| : fGraphicState(NULL), |
| fPaint(paint) {} |
| }; |
| |
| // This should be made a hash table if performance is a problem. |
| static SkTDArray<GSCanonicalEntry>& CanonicalPaints(); |
| static SkMutex& CanonicalPaintsMutex(); |
| |
| SkPDFGraphicState(); |
| explicit SkPDFGraphicState(const SkPaint& paint); |
| |
| void populateDict(); |
| |
| static SkPDFObject* GetInvertFunction(); |
| |
| static int Find(const SkPaint& paint); |
| }; |
| |
| #endif |