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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkPixmap_DEFINED
#define SkPixmap_DEFINED
#include "SkImageInfo.h"
class SkColorTable;
/**
* Pairs SkImageInfo with actual pixels and rowbytes. This class does not try to manage the
* lifetime of the pixel memory (nor the colortable if provided).
*/
class SkPixmap {
public:
SkPixmap()
: fPixels(NULL), fCTable(NULL), fRowBytes(0), fInfo(SkImageInfo::MakeUnknown(0, 0))
{}
SkPixmap(const SkImageInfo& info, const void* addr, size_t rowBytes,
SkColorTable* ctable = NULL)
: fPixels(addr), fCTable(ctable), fRowBytes(rowBytes), fInfo(info)
{
if (kIndex_8_SkColorType == info.colorType()) {
SkASSERT(ctable);
} else {
SkASSERT(NULL == ctable);
}
}
const SkImageInfo& info() const { return fInfo; }
size_t rowBytes() const { return fRowBytes; }
const void* addr() const { return fPixels; }
SkColorTable* ctable() const { return fCTable; }
int width() const { return fInfo.width(); }
int height() const { return fInfo.height(); }
SkColorType colorType() const { return fInfo.colorType(); }
SkAlphaType alphaType() const { return fInfo.alphaType(); }
bool isOpaque() const { return fInfo.isOpaque(); }
uint64_t getSize64() const { return sk_64_mul(fInfo.height(), fRowBytes); }
uint64_t getSafeSize64() const { return fInfo.getSafeSize64(fRowBytes); }
size_t getSafeSize() const { return fInfo.getSafeSize(fRowBytes); }
const uint32_t* addr32() const {
SkASSERT(4 == SkColorTypeBytesPerPixel(fInfo.colorType()));
return reinterpret_cast<const uint32_t*>(fPixels);
}
const uint16_t* addr16() const {
SkASSERT(2 == SkColorTypeBytesPerPixel(fInfo.colorType()));
return reinterpret_cast<const uint16_t*>(fPixels);
}
const uint8_t* addr8() const {
SkASSERT(1 == SkColorTypeBytesPerPixel(fInfo.colorType()));
return reinterpret_cast<const uint8_t*>(fPixels);
}
const uint32_t* addr32(int x, int y) const {
SkASSERT((unsigned)x < (unsigned)fInfo.width());
SkASSERT((unsigned)y < (unsigned)fInfo.height());
return (const uint32_t*)((const char*)this->addr32() + y * fRowBytes + (x << 2));
}
const uint16_t* addr16(int x, int y) const {
SkASSERT((unsigned)x < (unsigned)fInfo.width());
SkASSERT((unsigned)y < (unsigned)fInfo.height());
return (const uint16_t*)((const char*)this->addr16() + y * fRowBytes + (x << 1));
}
const uint8_t* addr8(int x, int y) const {
SkASSERT((unsigned)x < (unsigned)fInfo.width());
SkASSERT((unsigned)y < (unsigned)fInfo.height());
return (const uint8_t*)((const char*)this->addr8() + y * fRowBytes + (x << 0));
}
const void* addr(int x, int y) const {
return (const char*)fPixels + fInfo.computeOffset(x, y, fRowBytes);
}
// Writable versions
void* writable_addr() const { return const_cast<void*>(fPixels); }
uint32_t* writable_addr32(int x, int y) const {
return const_cast<uint32_t*>(this->addr32(x, y));
}
uint16_t* writable_addr16(int x, int y) const {
return const_cast<uint16_t*>(this->addr16(x, y));
}
uint8_t* writable_addr8(int x, int y) const {
return const_cast<uint8_t*>(this->addr8(x, y));
}
// copy methods
bool readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
int srcX, int srcY) const;
bool readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes) const {
return this->readPixels(dstInfo, dstPixels, dstRowBytes, 0, 0);
}
bool readPixels(const SkPixmap& dst, int srcX, int srcY) const {
return this->readPixels(dst.info(), dst.writable_addr(), dst.rowBytes(), srcX, srcY);
}
bool readPixels(const SkPixmap& dst) const {
return this->readPixels(dst.info(), dst.writable_addr(), dst.rowBytes(), 0, 0);
}
private:
const void* fPixels;
SkColorTable* fCTable;
size_t fRowBytes;
SkImageInfo fInfo;
};
/////////////////////////////////////////////////////////////////////////////////////////////
class SkAutoPixmapUnlock : ::SkNoncopyable {
public:
SkAutoPixmapUnlock() : fUnlockProc(NULL), fIsLocked(false) {}
SkAutoPixmapUnlock(const SkPixmap& pm, void (*unlock)(void*), void* ctx)
: fUnlockProc(unlock), fUnlockContext(ctx), fPixmap(pm), fIsLocked(true)
{}
~SkAutoPixmapUnlock() { this->unlock(); }
/**
* Return the currently locked pixmap. Undefined if it has been unlocked.
*/
const SkPixmap& pixmap() const {
SkASSERT(this->isLocked());
return fPixmap;
}
bool isLocked() const { return fIsLocked; }
/**
* Unlocks the pixmap. Can safely be called more than once as it will only call the underlying
* unlock-proc once.
*/
void unlock() {
if (fUnlockProc) {
SkASSERT(fIsLocked);
fUnlockProc(fUnlockContext);
fUnlockProc = NULL;
fIsLocked = false;
}
}
/**
* If there is a currently locked pixmap, unlock it, then copy the specified pixmap
* and (optional) unlock proc/context.
*/
void reset(const SkPixmap& pm, void (*unlock)(void*), void* ctx);
private:
void (*fUnlockProc)(void*);
void* fUnlockContext;
SkPixmap fPixmap;
bool fIsLocked;
friend class SkBitmap;
};
#endif
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