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/*
* 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 {
SK_DECLARE_INST_COUNT(SkPDFGraphicState)
public:
enum SkPDFSMaskMode {
kAlpha_SMaskMode,
kLuminosity_SMaskMode
};
virtual ~SkPDFGraphicState();
virtual void getResources(const SkTSet<SkPDFObject*>& knownResourceObjects,
SkTSet<SkPDFObject*>* newResourceObjects);
// Override emitObject so that we can populate the dictionary on
// demand.
virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog);
/** 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.
* @param sMaskMode Whether to use alpha or luminosity for the sMask.
*/
static SkPDFGraphicState* GetSMaskGraphicState(SkPDFFormXObject* sMask,
bool invert,
SkPDFSMaskMode sMaskMode);
/** 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();
bool equals(const SkPaint&) const;
// Only public for SK_DECLARE_STATIC_LAZY_PTR
static SkPDFGraphicState* CreateNoSMaskGraphicState();
private:
const SkPaint fPaint;
SkTDArray<SkPDFObject*> fResources;
bool fPopulated;
bool fSMask;
SkPDFGraphicState();
explicit SkPDFGraphicState(const SkPaint& paint);
void populateDict();
static SkPDFObject* GetInvertFunction();
typedef SkPDFDict INHERITED;
};
#endif
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