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Add YCoCg pixel type

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This commit is contained in:
Pavel Krajcevski 2014-02-18 13:25:29 -05:00
parent 4fc75f22dc
commit 9dc23db287
2 changed files with 54 additions and 1 deletions
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24
Base/include/Pixel.h
View file

@ -59,7 +59,7 @@
namespace FasTC {
class Pixel : public Vector4<uint16> {
private:
protected:
typedef uint16 ChannelType;
typedef Vector4<ChannelType> VectorType;
uint8 m_BitDepth[4];
@ -159,6 +159,28 @@ class Pixel : public Vector4<uint16> {
};
REGISTER_VECTOR_TYPE(Pixel);
class YCoCgPixel : public Pixel {
private:
void ToYCoCg();
public:
YCoCgPixel() : Pixel() { }
explicit YCoCgPixel(uint32 rgba) : Pixel(rgba) { ToYCoCg(); }
explicit YCoCgPixel(const Pixel &p) : Pixel(p) { ToYCoCg(); }
Pixel ToRGBA() const;
float ToIntensity() const { return ConvertChannelToFloat(R(), 8); }
uint32 Pack() const { return ToRGBA().Pack(); }
void Unpack(uint32 rgba) { Pixel::Unpack(rgba); ToYCoCg(); }
const ChannelType &Co() const { return Z(); }
ChannelType &Co() { return Z(); }
const ChannelType &Cg() const { return W(); }
ChannelType &Cg() { return W(); }
};
REGISTER_VECTOR_TYPE(YCoCgPixel);
} // namespace FasTC
#endif // BASE_INCLUDE_PIXEL_H_

31
Base/src/Pixel.cpp
View file

@ -56,6 +56,11 @@
#include <cassert>
#include <algorithm>
template<typename T>
static inline T Clamp(const T &v, const T &_min, const T &_max) {
return std::max(_min, std::min(v, _max));
}
namespace FasTC {
void Pixel::FromBits(const uint8 *bits,
@ -260,4 +265,30 @@ namespace FasTC {
return ok;
}
void YCoCgPixel::ToYCoCg() {
int16 Y = ((R() + (G() << 1) + B()) + 2) >> 2;
int16 Co = (R() - B() + 1) >> 1;
int16 Cg = ((-R() + (G() << 1) - B()) + 2) >> 2;
this->Y() = Clamp<int16>(Y, 0, 255);
this->Co() = Clamp<int16>(Co + 128, 0, 255);
this->Cg() = Clamp<int16>(Cg + 128, 0, 255);
}
Pixel YCoCgPixel::ToRGBA() const {
int16 Co = this->Co() - 128;
int16 Cg = this->Cg() - 128;
int16 R = Y() + (Co - Cg);
int16 G = Y() + Cg;
int16 B = Y() - (Co + Cg);
Pixel p;
p.R() = Clamp<int16>(R, 0, 255);
p.G() = Clamp<int16>(G, 0, 255);
p.B() = Clamp<int16>(B, 0, 255);
p.A() = A();
return p;
}
} // namespace FasTC