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