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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 "SkChecksum.h"
class SkPDFCanon;
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.
*/
class SkPDFGraphicState : public SkPDFObject {
public:
enum SkPDFSMaskMode {
kAlpha_SMaskMode,
kLuminosity_SMaskMode
};
// Override emitObject so that we can populate the dictionary on
// demand.
void emitObject(SkWStream* stream,
const SkPDFObjNumMap& objNumMap,
const SkPDFSubstituteMap& substitutes) const override;
/** 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(SkPDFCanon* canon,
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.
*
* These are not de-duped.
*/
static SkPDFDict* 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.
*
* The returned object is a singleton.
*/
static SkPDFDict* GetNoSMaskGraphicState();
bool operator==(const SkPDFGraphicState& rhs) const {
return 0 == memcmp(&fStrokeWidth, &rhs.fStrokeWidth, 12);
}
uint32_t hash() const { return SkChecksum::Murmur3(&fStrokeWidth, 12); }
private:
const SkScalar fStrokeWidth;
const SkScalar fStrokeMiter;
const uint8_t fAlpha;
const uint8_t fStrokeCap; // SkPaint::Cap
const uint8_t fStrokeJoin; // SkPaint::Join
const uint8_t fMode; // SkXfermode::Mode
SkPDFGraphicState(const SkPaint&);
typedef SkPDFDict INHERITED;
};
#endif
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