| 1 | /// @ref gtx_color_space_YCoCg |
| 2 | |
| 3 | namespace glm |
| 4 | { |
| 5 | template<typename T, qualifier Q> |
| 6 | GLM_FUNC_QUALIFIER vec<3, T, Q> rgb2YCoCg |
| 7 | ( |
| 8 | vec<3, T, Q> const& rgbColor |
| 9 | ) |
| 10 | { |
| 11 | vec<3, T, Q> result; |
| 12 | result.x/*Y */ = rgbColor.r / T(4) + rgbColor.g / T(2) + rgbColor.b / T(4); |
| 13 | result.y/*Co*/ = rgbColor.r / T(2) + rgbColor.g * T(0) - rgbColor.b / T(2); |
| 14 | result.z/*Cg*/ = - rgbColor.r / T(4) + rgbColor.g / T(2) - rgbColor.b / T(4); |
| 15 | return result; |
| 16 | } |
| 17 | |
| 18 | template<typename T, qualifier Q> |
| 19 | GLM_FUNC_QUALIFIER vec<3, T, Q> YCoCg2rgb |
| 20 | ( |
| 21 | vec<3, T, Q> const& YCoCgColor |
| 22 | ) |
| 23 | { |
| 24 | vec<3, T, Q> result; |
| 25 | result.r = YCoCgColor.x + YCoCgColor.y - YCoCgColor.z; |
| 26 | result.g = YCoCgColor.x + YCoCgColor.z; |
| 27 | result.b = YCoCgColor.x - YCoCgColor.y - YCoCgColor.z; |
| 28 | return result; |
| 29 | } |
| 30 | |
| 31 | template<typename T, qualifier Q, bool isInteger> |
| 32 | class compute_YCoCgR { |
| 33 | public: |
| 34 | static GLM_FUNC_QUALIFIER vec<3, T, Q> rgb2YCoCgR |
| 35 | ( |
| 36 | vec<3, T, Q> const& rgbColor |
| 37 | ) |
| 38 | { |
| 39 | vec<3, T, Q> result; |
| 40 | result.x/*Y */ = rgbColor.g * static_cast<T>(0.5) + (rgbColor.r + rgbColor.b) * static_cast<T>(0.25); |
| 41 | result.y/*Co*/ = rgbColor.r - rgbColor.b; |
| 42 | result.z/*Cg*/ = rgbColor.g - (rgbColor.r + rgbColor.b) * static_cast<T>(0.5); |
| 43 | return result; |
| 44 | } |
| 45 | |
| 46 | static GLM_FUNC_QUALIFIER vec<3, T, Q> YCoCgR2rgb |
| 47 | ( |
| 48 | vec<3, T, Q> const& YCoCgRColor |
| 49 | ) |
| 50 | { |
| 51 | vec<3, T, Q> result; |
| 52 | T tmp = YCoCgRColor.x - (YCoCgRColor.z * static_cast<T>(0.5)); |
| 53 | result.g = YCoCgRColor.z + tmp; |
| 54 | result.b = tmp - (YCoCgRColor.y * static_cast<T>(0.5)); |
| 55 | result.r = result.b + YCoCgRColor.y; |
| 56 | return result; |
| 57 | } |
| 58 | }; |
| 59 | |
| 60 | template<typename T, qualifier Q> |
| 61 | class compute_YCoCgR<T, Q, true> { |
| 62 | public: |
| 63 | static GLM_FUNC_QUALIFIER vec<3, T, Q> rgb2YCoCgR |
| 64 | ( |
| 65 | vec<3, T, Q> const& rgbColor |
| 66 | ) |
| 67 | { |
| 68 | vec<3, T, Q> result; |
| 69 | result.y/*Co*/ = rgbColor.r - rgbColor.b; |
| 70 | T tmp = rgbColor.b + (result.y >> 1); |
| 71 | result.z/*Cg*/ = rgbColor.g - tmp; |
| 72 | result.x/*Y */ = tmp + (result.z >> 1); |
| 73 | return result; |
| 74 | } |
| 75 | |
| 76 | static GLM_FUNC_QUALIFIER vec<3, T, Q> YCoCgR2rgb |
| 77 | ( |
| 78 | vec<3, T, Q> const& YCoCgRColor |
| 79 | ) |
| 80 | { |
| 81 | vec<3, T, Q> result; |
| 82 | T tmp = YCoCgRColor.x - (YCoCgRColor.z >> 1); |
| 83 | result.g = YCoCgRColor.z + tmp; |
| 84 | result.b = tmp - (YCoCgRColor.y >> 1); |
| 85 | result.r = result.b + YCoCgRColor.y; |
| 86 | return result; |
| 87 | } |
| 88 | }; |
| 89 | |
| 90 | template<typename T, qualifier Q> |
| 91 | GLM_FUNC_QUALIFIER vec<3, T, Q> rgb2YCoCgR |
| 92 | ( |
| 93 | vec<3, T, Q> const& rgbColor |
| 94 | ) |
| 95 | { |
| 96 | return compute_YCoCgR<T, Q, std::numeric_limits<T>::is_integer>::rgb2YCoCgR(rgbColor); |
| 97 | } |
| 98 | |
| 99 | template<typename T, qualifier Q> |
| 100 | GLM_FUNC_QUALIFIER vec<3, T, Q> YCoCgR2rgb |
| 101 | ( |
| 102 | vec<3, T, Q> const& YCoCgRColor |
| 103 | ) |
| 104 | { |
| 105 | return compute_YCoCgR<T, Q, std::numeric_limits<T>::is_integer>::YCoCgR2rgb(YCoCgRColor); |
| 106 | } |
| 107 | }//namespace glm |