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LibMedia: Implement conversion of BT601 primaries

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aplefull 2025-04-23 18:28:17 +02:00 • committed by Sam Atkins
commit 68ddc7006d
Notes: github-actions[bot] 2025-05-16 11:45:12 +00:00
1 changed files with 11 additions and 0 deletions
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11
Libraries/LibMedia/Color/ColorPrimaries.cpp
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@ -56,12 +56,17 @@ constexpr FloatVector2 BT_709_RED = { 0.64f, 0.33f };
constexpr FloatVector2 BT_709_GREEN = { 0.30f, 0.60f }; constexpr FloatVector2 BT_709_GREEN = { 0.30f, 0.60f };
constexpr FloatVector2 BT_709_BLUE = { 0.15f, 0.06f }; constexpr FloatVector2 BT_709_BLUE = { 0.15f, 0.06f };
constexpr FloatVector2 BT_601_RED = { 0.630f, 0.340f };
constexpr FloatVector2 BT_601_GREEN = { 0.310f, 0.595f };
constexpr FloatVector2 BT_601_BLUE = { 0.155f, 0.070f };
constexpr FloatVector2 BT_2020_RED = { 0.708f, 0.292f }; constexpr FloatVector2 BT_2020_RED = { 0.708f, 0.292f };
constexpr FloatVector2 BT_2020_GREEN = { 0.170f, 0.797f }; constexpr FloatVector2 BT_2020_GREEN = { 0.170f, 0.797f };
constexpr FloatVector2 BT_2020_BLUE = { 0.131f, 0.046f }; constexpr FloatVector2 BT_2020_BLUE = { 0.131f, 0.046f };
constexpr FloatMatrix3x3 bt_2020_rgb_to_xyz = generate_rgb_to_xyz_matrix(BT_2020_RED, BT_2020_GREEN, BT_2020_BLUE, ILLUMINANT_D65); constexpr FloatMatrix3x3 bt_2020_rgb_to_xyz = generate_rgb_to_xyz_matrix(BT_2020_RED, BT_2020_GREEN, BT_2020_BLUE, ILLUMINANT_D65);
constexpr FloatMatrix3x3 bt_709_rgb_to_xyz = generate_rgb_to_xyz_matrix(BT_709_RED, BT_709_GREEN, BT_709_BLUE, ILLUMINANT_D65); constexpr FloatMatrix3x3 bt_709_rgb_to_xyz = generate_rgb_to_xyz_matrix(BT_709_RED, BT_709_GREEN, BT_709_BLUE, ILLUMINANT_D65);
constexpr FloatMatrix3x3 bt_601_rgb_to_xyz = generate_rgb_to_xyz_matrix(BT_601_RED, BT_601_GREEN, BT_601_BLUE, ILLUMINANT_D65);
DecoderErrorOr<FloatMatrix3x3> get_conversion_matrix(ColorPrimaries input_primaries, ColorPrimaries output_primaries) DecoderErrorOr<FloatMatrix3x3> get_conversion_matrix(ColorPrimaries input_primaries, ColorPrimaries output_primaries)
{ {
@ -70,6 +75,9 @@ DecoderErrorOr<FloatMatrix3x3> get_conversion_matrix(ColorPrimaries input_primar
case ColorPrimaries::BT709: case ColorPrimaries::BT709:
input_conversion_matrix = bt_709_rgb_to_xyz; input_conversion_matrix = bt_709_rgb_to_xyz;
break; break;
case ColorPrimaries::BT601:
input_conversion_matrix = bt_601_rgb_to_xyz;
break;
case ColorPrimaries::BT2020: case ColorPrimaries::BT2020:
input_conversion_matrix = bt_2020_rgb_to_xyz; input_conversion_matrix = bt_2020_rgb_to_xyz;
break; break;
@ -82,6 +90,9 @@ DecoderErrorOr<FloatMatrix3x3> get_conversion_matrix(ColorPrimaries input_primar
case ColorPrimaries::BT709: case ColorPrimaries::BT709:
output_conversion_matrix = bt_709_rgb_to_xyz.inverse(); output_conversion_matrix = bt_709_rgb_to_xyz.inverse();
break; break;
case ColorPrimaries::BT601:
output_conversion_matrix = bt_601_rgb_to_xyz.inverse();
break;
case ColorPrimaries::BT2020: case ColorPrimaries::BT2020:
output_conversion_matrix = bt_2020_rgb_to_xyz.inverse(); output_conversion_matrix = bt_2020_rgb_to_xyz.inverse();
break; break;