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Adds getters for standard colour-space conversion matrices.

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These are just more details on the meaning of the colour spaces, so I think they belong here.
This commit is contained in:
Thomas Harte 2020-08-11 19:58:57 -04:00
parent 4b55df1cb4
commit 637ec35d6a
1 changed files with 29 additions and 0 deletions
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29
Outputs/ScanTarget.hpp
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@ -9,6 +9,7 @@
#ifndef Outputs_Display_ScanTarget_h
#define Outputs_Display_ScanTarget_h
#include <array>
#include <cstddef>
#include <cstdint>
#include "../ClockReceiver/TimeTypes.hpp"
@ -153,6 +154,34 @@ constexpr inline DisplayType natural_display_type_for_data_type(InputDataType da
}
}
/// @returns A 3x3 matrix in row-major order to convert from @c colour_space to RGB.
inline std::array<float, 9> to_rgb_matrix(ColourSpace colour_space) {
const std::array<float, 9> yiq_to_rgb = {1.0f, 1.0f, 1.0f, 0.956f, -0.272f, -1.106f, 0.621f, -0.647f, 1.703f};
const std::array<float, 9> yuv_to_rgb = {1.0f, 1.0f, 1.0f, 0.0f, -0.39465f, 2.03211f, 1.13983f, -0.58060f, 0.0f};
switch(colour_space) {
case ColourSpace::YIQ: return yiq_to_rgb;
case ColourSpace::YUV: return yuv_to_rgb;
}
// Should be unreachable.
return std::array<float, 9>{};
}
/// @returns A 3x3 matrix in row-major order to convert to @c colour_space to RGB.
inline std::array<float, 9> from_rgb_matrix(ColourSpace colour_space) {
const std::array<float, 9> rgb_to_yiq = {0.299f, 0.596f, 0.211f, 0.587f, -0.274f, -0.523f, 0.114f, -0.322f, 0.312f};
const std::array<float, 9> rgb_to_yuv = {0.299f, -0.14713f, 0.615f, 0.587f, -0.28886f, -0.51499f, 0.114f, 0.436f, -0.10001f};
switch(colour_space) {
case ColourSpace::YIQ: return rgb_to_yiq;
case ColourSpace::YUV: return rgb_to_yuv;
}
// Should be unreachable.
return std::array<float, 9>{};
}
/*!
Provides an abstract target for 'scans' i.e. continuous sweeps of output data,
which are identified by 2d start and end coordinates, and the PCM-sampled data