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LibMedia: Support BT.470 System B/G color primaries

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Zaggy1024 2025-10-15 19:26:52 -05:00 • committed by Gregory Bertilson
parent b684bc0a9d
commit 9cd0f9c445
Notes: github-actions[bot] 2025-10-16 10:13:35 +00:00
1 changed files with 12 additions and 0 deletions
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12
Libraries/LibMedia/Color/ColorPrimaries.cpp
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@ -50,6 +50,11 @@ ALWAYS_INLINE constexpr FloatMatrix3x3 generate_rgb_to_xyz_matrix(FloatVector2 r
return vectors_to_matrix(matrix_row(matrix, 0) * scale_vector, matrix_row(matrix, 1) * scale_vector, matrix_row(matrix, 2) * scale_vector); return vectors_to_matrix(matrix_row(matrix, 0) * scale_vector, matrix_row(matrix, 1) * scale_vector, matrix_row(matrix, 2) * scale_vector);
} }
constexpr FloatVector2 BT_470_BG_WHITE = { 0.310f, 0.316f };
constexpr FloatVector2 BT_470_BG_RED = { 0.67f, 0.33f };
constexpr FloatVector2 BT_470_BG_GREEN = { 0.21f, 0.71f };
constexpr FloatVector2 BT_470_BG_BLUE = { 0.14f, 0.08f };
constexpr FloatVector2 ILLUMINANT_D65 = { 0.3127f, 0.3290f }; constexpr FloatVector2 ILLUMINANT_D65 = { 0.3127f, 0.3290f };
constexpr FloatVector2 BT_709_RED = { 0.64f, 0.33f }; constexpr FloatVector2 BT_709_RED = { 0.64f, 0.33f };
@ -64,6 +69,7 @@ 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_470_bg_rgb_to_xyz = generate_rgb_to_xyz_matrix(BT_470_BG_RED, BT_470_BG_GREEN, BT_470_BG_BLUE, BT_470_BG_WHITE);
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); constexpr FloatMatrix3x3 bt_601_rgb_to_xyz = generate_rgb_to_xyz_matrix(BT_601_RED, BT_601_GREEN, BT_601_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_2020_rgb_to_xyz = generate_rgb_to_xyz_matrix(BT_2020_RED, BT_2020_GREEN, BT_2020_BLUE, ILLUMINANT_D65);
@ -72,6 +78,9 @@ DecoderErrorOr<FloatMatrix3x3> get_conversion_matrix(ColorPrimaries input_primar
{ {
FloatMatrix3x3 input_conversion_matrix; FloatMatrix3x3 input_conversion_matrix;
switch (input_primaries) { switch (input_primaries) {
case ColorPrimaries::BT470BG:
input_conversion_matrix = bt_470_bg_rgb_to_xyz;
break;
case ColorPrimaries::BT709: case ColorPrimaries::BT709:
input_conversion_matrix = bt_709_rgb_to_xyz; input_conversion_matrix = bt_709_rgb_to_xyz;
break; break;
@ -87,6 +96,9 @@ DecoderErrorOr<FloatMatrix3x3> get_conversion_matrix(ColorPrimaries input_primar
FloatMatrix3x3 output_conversion_matrix; FloatMatrix3x3 output_conversion_matrix;
switch (output_primaries) { switch (output_primaries) {
case ColorPrimaries::BT470BG:
output_conversion_matrix = bt_470_bg_rgb_to_xyz.inverse();
break;
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;