108 lines
2.7 KiB
C++
108 lines
2.7 KiB
C++
/// @ref gtx_color_space_YCoCg
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namespace glm
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{
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template<typename T, qualifier Q>
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GLM_FUNC_QUALIFIER vec<3, T, Q> rgb2YCoCg
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(
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vec<3, T, Q> const& rgbColor
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)
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{
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vec<3, T, Q> result;
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result.x/*Y */ = rgbColor.r / T(4) + rgbColor.g / T(2) + rgbColor.b / T(4);
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result.y/*Co*/ = rgbColor.r / T(2) + rgbColor.g * T(0) - rgbColor.b / T(2);
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result.z/*Cg*/ = - rgbColor.r / T(4) + rgbColor.g / T(2) - rgbColor.b / T(4);
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return result;
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}
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template<typename T, qualifier Q>
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GLM_FUNC_QUALIFIER vec<3, T, Q> YCoCg2rgb
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(
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vec<3, T, Q> const& YCoCgColor
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)
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{
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vec<3, T, Q> result;
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result.r = YCoCgColor.x + YCoCgColor.y - YCoCgColor.z;
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result.g = YCoCgColor.x + YCoCgColor.z;
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result.b = YCoCgColor.x - YCoCgColor.y - YCoCgColor.z;
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return result;
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}
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template<typename T, qualifier Q, bool isInteger>
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class compute_YCoCgR {
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public:
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static GLM_FUNC_QUALIFIER vec<3, T, Q> rgb2YCoCgR
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(
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vec<3, T, Q> const& rgbColor
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)
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{
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vec<3, T, Q> result;
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result.x/*Y */ = rgbColor.g * static_cast<T>(0.5) + (rgbColor.r + rgbColor.b) * static_cast<T>(0.25);
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result.y/*Co*/ = rgbColor.r - rgbColor.b;
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result.z/*Cg*/ = rgbColor.g - (rgbColor.r + rgbColor.b) * static_cast<T>(0.5);
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return result;
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}
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static GLM_FUNC_QUALIFIER vec<3, T, Q> YCoCgR2rgb
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(
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vec<3, T, Q> const& YCoCgRColor
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)
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{
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vec<3, T, Q> result;
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T tmp = YCoCgRColor.x - (YCoCgRColor.z * static_cast<T>(0.5));
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result.g = YCoCgRColor.z + tmp;
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result.b = tmp - (YCoCgRColor.y * static_cast<T>(0.5));
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result.r = result.b + YCoCgRColor.y;
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return result;
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}
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};
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template<typename T, qualifier Q>
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class compute_YCoCgR<T, Q, true> {
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public:
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static GLM_FUNC_QUALIFIER vec<3, T, Q> rgb2YCoCgR
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(
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vec<3, T, Q> const& rgbColor
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)
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{
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vec<3, T, Q> result;
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result.y/*Co*/ = rgbColor.r - rgbColor.b;
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T tmp = rgbColor.b + (result.y >> 1);
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result.z/*Cg*/ = rgbColor.g - tmp;
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result.x/*Y */ = tmp + (result.z >> 1);
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return result;
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}
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static GLM_FUNC_QUALIFIER vec<3, T, Q> YCoCgR2rgb
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(
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vec<3, T, Q> const& YCoCgRColor
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)
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{
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vec<3, T, Q> result;
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T tmp = YCoCgRColor.x - (YCoCgRColor.z >> 1);
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result.g = YCoCgRColor.z + tmp;
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result.b = tmp - (YCoCgRColor.y >> 1);
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result.r = result.b + YCoCgRColor.y;
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return result;
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}
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};
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template<typename T, qualifier Q>
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GLM_FUNC_QUALIFIER vec<3, T, Q> rgb2YCoCgR
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(
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vec<3, T, Q> const& rgbColor
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)
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{
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return compute_YCoCgR<T, Q, std::numeric_limits<T>::is_integer>::rgb2YCoCgR(rgbColor);
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}
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template<typename T, qualifier Q>
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GLM_FUNC_QUALIFIER vec<3, T, Q> YCoCgR2rgb
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(
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vec<3, T, Q> const& YCoCgRColor
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)
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{
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return compute_YCoCgR<T, Q, std::numeric_limits<T>::is_integer>::YCoCgR2rgb(YCoCgRColor);
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}
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}//namespace glm
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