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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkColorTable_DEFINED
#define SkColorTable_DEFINED
#include "SkColor.h"
#include "SkFlattenable.h"
#include "SkImageInfo.h"
/** \class SkColorTable
SkColorTable holds an array SkPMColors (premultiplied 32-bit colors) used by
8-bit bitmaps, where the bitmap bytes are interpreted as indices into the colortable.
*/
class SK_API SkColorTable : public SkRefCnt {
public:
SK_DECLARE_INST_COUNT(SkColorTable)
/** Makes a deep copy of colors.
*/
SkColorTable(const SkColorTable& src);
SkColorTable(const SkPMColor colors[], int count,
SkAlphaType alphaType = kPremul_SkAlphaType);
virtual ~SkColorTable();
SkAlphaType alphaType() const { return (SkAlphaType)fAlphaType; }
bool isOpaque() const {
return SkAlphaTypeIsOpaque(this->alphaType());
}
/** Returns the number of colors in the table.
*/
int count() const { return fCount; }
/** Returns the specified color from the table. In the debug build, this asserts that
the index is in range (0 <= index < count).
*/
SkPMColor operator[](int index) const {
SkASSERT(fColors != NULL && (unsigned)index < fCount);
return fColors[index];
}
/**
* Return the array of colors for reading. This must be balanced by a call
* to unlockColors().
*/
const SkPMColor* lockColors() {
SkDEBUGCODE(sk_atomic_inc(&fColorLockCount);)
return fColors;
}
/**
* Balancing call to lockColors().
*/
void unlockColors();
/** Similar to lockColors(), lock16BitCache() returns the array of
RGB16 colors that mirror the 32bit colors. However, this function
will return null if kColorsAreOpaque_Flag is not set.
Also, unlike lockColors(), the returned array here cannot be modified.
*/
const uint16_t* lock16BitCache();
/** Balancing call to lock16BitCache().
*/
void unlock16BitCache() {
SkASSERT(f16BitCacheLockCount > 0);
SkDEBUGCODE(f16BitCacheLockCount -= 1);
}
explicit SkColorTable(SkReadBuffer&);
void writeToBuffer(SkWriteBuffer&) const;
private:
SkPMColor* fColors;
uint16_t* f16BitCache;
uint16_t fCount;
uint8_t fAlphaType;
SkDEBUGCODE(int fColorLockCount;)
SkDEBUGCODE(int f16BitCacheLockCount;)
void inval16BitCache();
typedef SkRefCnt INHERITED;
};
#endif
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