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#include <kms++util/color.h>
namespace kms
{
RGB::RGB()
{
r = g = b = 0;
a = 255;
}
RGB::RGB(uint8_t r, uint8_t g, uint8_t b)
:RGB(255, r, g, b)
{
}
RGB::RGB(uint8_t a, uint8_t r, uint8_t g, uint8_t b)
{
this->r = r;
this->g = g;
this->b = b;
this->a = a;
}
RGB::RGB(uint32_t argb)
{
this->b = (argb >> 0) & 0xff;
this->g = (argb >> 8) & 0xff;
this->r = (argb >> 16) & 0xff;
this->a = (argb >> 24) & 0xff;
}
uint32_t RGB::rgb888() const
{
return (r << 16) | (g << 8) | (b << 0);
}
uint32_t RGB::bgr888() const
{
return (b << 16) | (g << 8) | (r << 0);
}
uint32_t RGB::argb8888() const
{
return (a << 24) | (r << 16) | (g << 8) | (b << 0);
}
uint32_t RGB::abgr8888() const
{
return (a << 24) | (b << 16) | (g << 8) | (r << 0);
}
uint16_t RGB::rgb565() const
{
return ((r >> 3) << 11) | ((g >> 2) << 5) | ((b >> 3) << 0);
}
uint16_t RGB::bgr565() const
{
return ((b >> 3) << 11) | ((g >> 2) << 5) | ((r >> 3) << 0);
}
YUV RGB::yuv(YUVType type) const
{
return YUV(*this, type);
}
#define CF_ONE (256)
#define CF(a, b, c) { ((int) ((a) * CF_ONE)), ((int) ((b) * CF_ONE)), ((int) ((c) * CF_ONE)) }
#define CLAMP(a) ((a) > (CF_ONE-1) ? (CF_ONE-1) : (a) < 0 ? 0 : (a))
const int YUVcoef[static_cast<unsigned>(YUVType::MAX)][3][3] = {
[static_cast<unsigned>(YUVType::BT601_Lim)] = {
CF( 0.257, 0.504, 0.098),
CF(-0.148, -0.291, 0.439),
CF( 0.439, -0.368, -0.071) },
[static_cast<unsigned>(YUVType::BT601_Full)] = {
CF( 0.299, 0.587, 0.114),
CF(-0.169, -0.331, 0.500),
CF( 0.500, -0.419, -0.081) },
[static_cast<unsigned>(YUVType::BT709_Lim)] = {
CF( 0.1826, 0.6142, 0.0620),
CF(-0.1006, -0.3386, 0.4392),
CF( 0.4392, -0.3989, -0.0403) },
[static_cast<unsigned>(YUVType::BT709_Full)] = {
CF( 0.2126, 0.7152, 0.0722),
CF(-0.1146, -0.3854, 0.5000),
CF( 0.5000, -0.4542, -0.0468) },
};
const int YUVoffset[static_cast<unsigned>(YUVType::MAX)][3] = {
[static_cast<unsigned>(YUVType::BT601_Lim)] = CF(0.0625, 0.5, 0.5),
[static_cast<unsigned>(YUVType::BT601_Full)] = CF( 0, 0.5, 0.5),
[static_cast<unsigned>(YUVType::BT709_Lim)] = CF(0.0625, 0.5, 0.5),
[static_cast<unsigned>(YUVType::BT709_Full)] = CF( 0, 0.5, 0.5),
};
YUV::YUV()
{
y = u = v = a = 0;
}
YUV::YUV(uint8_t y, uint8_t u, uint8_t v)
{
this->y = y;
this->u = u;
this->v = v;
this->a = 0;
}
static inline
uint8_t MAKE_YUV_Y(uint8_t r, uint8_t g, uint8_t b, YUVType type)
{
unsigned tidx = static_cast<unsigned>(type);
return CLAMP(((YUVcoef[tidx][0][0] * r + YUVcoef[tidx][0][1] * g +
YUVcoef[tidx][0][2] * b + CF_ONE/2) / CF_ONE) +
YUVoffset[tidx][0]);
}
static inline
uint8_t MAKE_YUV_U(uint8_t r, uint8_t g, uint8_t b, YUVType type)
{
unsigned tidx = static_cast<unsigned>(type);
return CLAMP(((YUVcoef[tidx][1][0] * r + YUVcoef[tidx][1][1] * g +
YUVcoef[tidx][1][2] * b + CF_ONE/2) / CF_ONE) +
YUVoffset[tidx][1]);
}
static inline
uint8_t MAKE_YUV_V(uint8_t r, uint8_t g, uint8_t b, YUVType type)
{
unsigned tidx = static_cast<unsigned>(type);
return CLAMP(((YUVcoef[tidx][2][0] * r + YUVcoef[tidx][2][1] * g +
YUVcoef[tidx][2][2] * b + CF_ONE/2) / CF_ONE) +
YUVoffset[tidx][2]);
}
YUV::YUV(const RGB& rgb, YUVType type)
{
this->y = MAKE_YUV_Y(rgb.r, rgb.g, rgb.b, type);
this->u = MAKE_YUV_U(rgb.r, rgb.g, rgb.b, type);
this->v = MAKE_YUV_V(rgb.r, rgb.g, rgb.b, type);
this->a = rgb.a;
}
}
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