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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 "SkColor.h"
#include "SkFilterQuality.h"
#include "SkImageInfo.h"
class SkData;
struct SkMask;
/**
* 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 SK_API SkPixmap {
public:
SkPixmap()
: fPixels(nullptr), fRowBytes(0), fInfo(SkImageInfo::MakeUnknown(0, 0))
{}
SkPixmap(const SkImageInfo& info, const void* addr, size_t rowBytes)
: fPixels(addr), fRowBytes(rowBytes), fInfo(info)
{}
void reset();
void reset(const SkImageInfo& info, const void* addr, size_t rowBytes);
void reset(const SkImageInfo& info) {
this->reset(info, nullptr, 0);
}
// overrides the colorspace in the SkImageInfo of the pixmap
void setColorSpace(sk_sp<SkColorSpace>);
/**
* If supported, set this pixmap to point to the pixels in the specified mask and return true.
* On failure, return false and set this pixmap to empty.
*/
bool SK_WARN_UNUSED_RESULT reset(const SkMask&);
/**
* Computes the intersection of area and this pixmap. If that intersection is non-empty,
* set subset to that intersection and return true.
*
* On failure, return false and ignore the subset parameter.
*/
bool SK_WARN_UNUSED_RESULT extractSubset(SkPixmap* subset, const SkIRect& area) const;
const SkImageInfo& info() const { return fInfo; }
size_t rowBytes() const { return fRowBytes; }
const void* addr() const { return fPixels; }
int width() const { return fInfo.width(); }
int height() const { return fInfo.height(); }
SkColorType colorType() const { return fInfo.colorType(); }
SkAlphaType alphaType() const { return fInfo.alphaType(); }
SkColorSpace* colorSpace() const { return fInfo.colorSpace(); }
bool isOpaque() const { return fInfo.isOpaque(); }
SkIRect bounds() const { return SkIRect::MakeWH(this->width(), this->height()); }
/**
* Return the rowbytes expressed as a number of pixels (like width and height).
*/
int rowBytesAsPixels() const { return int(fRowBytes >> this->shiftPerPixel()); }
/**
* Return the shift amount per pixel (i.e. 0 for 1-byte per pixel, 1 for 2-bytes per pixel
* colortypes, 2 for 4-bytes per pixel colortypes). Return 0 for kUnknown_SkColorType.
*/
int shiftPerPixel() const { return fInfo.shiftPerPixel(); }
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); }
/**
* This will brute-force return true if all of the pixels in the pixmap
* are opaque. If there are no pixels, or encounters an error, returns false.
*/
bool computeIsOpaque() const;
/**
* Converts the pixel at the specified coordinate to an unpremultiplied
* SkColor. Note: this ignores any SkColorSpace information, and may return
* lower precision data than is actually in the pixel. Alpha only
* colortypes (e.g. kAlpha_8_SkColorType) return black with the appropriate
* alpha set. The value is undefined for kUnknown_SkColorType or if x or y
* are out of bounds, or if the pixtap does not have any pixels.
*/
SkColor getColor(int x, int y) const;
const void* addr(int x, int y) const {
return (const char*)fPixels + fInfo.computeOffset(x, y, fRowBytes);
}
const uint8_t* addr8() const {
SkASSERT(1 == SkColorTypeBytesPerPixel(fInfo.colorType()));
return reinterpret_cast<const uint8_t*>(fPixels);
}
const uint16_t* addr16() const {
SkASSERT(2 == SkColorTypeBytesPerPixel(fInfo.colorType()));
return reinterpret_cast<const uint16_t*>(fPixels);
}
const uint32_t* addr32() const {
SkASSERT(4 == SkColorTypeBytesPerPixel(fInfo.colorType()));
return reinterpret_cast<const uint32_t*>(fPixels);
}
const uint64_t* addr64() const {
SkASSERT(8 == SkColorTypeBytesPerPixel(fInfo.colorType()));
return reinterpret_cast<const uint64_t*>(fPixels);
}
const uint16_t* addrF16() const {
SkASSERT(8 == SkColorTypeBytesPerPixel(fInfo.colorType()));
SkASSERT(kRGBA_F16_SkColorType == fInfo.colorType());
return reinterpret_cast<const uint16_t*>(fPixels);
}
// Offset by the specified x,y coordinates
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 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 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 uint64_t* addr64(int x, int y) const {
SkASSERT((unsigned)x < (unsigned)fInfo.width());
SkASSERT((unsigned)y < (unsigned)fInfo.height());
return (const uint64_t*)((const char*)this->addr64() + y * fRowBytes + (x << 3));
}
const uint16_t* addrF16(int x, int y) const {
SkASSERT(kRGBA_F16_SkColorType == fInfo.colorType());
return reinterpret_cast<const uint16_t*>(this->addr64(x, y));
}
// Writable versions
void* writable_addr() const { return const_cast<void*>(fPixels); }
void* writable_addr(int x, int y) const {
return const_cast<void*>(this->addr(x, y));
}
uint8_t* writable_addr8(int x, int y) const {
return const_cast<uint8_t*>(this->addr8(x, y));
}
uint16_t* writable_addr16(int x, int y) const {
return const_cast<uint16_t*>(this->addr16(x, y));
}
uint32_t* writable_addr32(int x, int y) const {
return const_cast<uint32_t*>(this->addr32(x, y));
}
uint64_t* writable_addr64(int x, int y) const {
return const_cast<uint64_t*>(this->addr64(x, y));
}
uint16_t* writable_addrF16(int x, int y) const {
return reinterpret_cast<uint16_t*>(writable_addr64(x, y));
}
// copy methods
bool readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
int srcX, int srcY, SkTransferFunctionBehavior behavior) const;
bool readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes) const {
return this->readPixels(dstInfo, dstPixels, dstRowBytes, 0, 0);
}
bool readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes, int srcX,
int srcY) const {
return this->readPixels(dstInfo, dstPixels, dstRowBytes, srcX, srcY,
SkTransferFunctionBehavior::kRespect);
}
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);
}
/**
* Copy the pixels from this pixmap into the dst pixmap, converting as needed into dst's
* colortype/alphatype. If the conversion cannot be performed, false is returned.
*
* If dst's dimensions differ from the src dimension, the image will be scaled, applying the
* specified filter-quality.
*/
bool scalePixels(const SkPixmap& dst, SkFilterQuality) const;
/**
* Returns true if pixels were written to (e.g. if colorType is kUnknown_SkColorType, this
* will return false). If subset does not intersect the bounds of this pixmap, returns false.
*/
bool erase(SkColor, const SkIRect& subset) const;
bool erase(SkColor color) const { return this->erase(color, this->bounds()); }
bool erase(const SkColor4f&, const SkIRect* subset = nullptr) const;
private:
const void* fPixels;
size_t fRowBytes;
SkImageInfo fInfo;
};
#endif
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