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#ifndef RENDER_COLOR_H
#define RENDER_COLOR_H
#include <stdint.h>
#include <wlr/render/color.h>
#include <wlr/util/addon.h>
enum wlr_color_transform_type {
COLOR_TRANSFORM_SRGB,
COLOR_TRANSFORM_LUT_3D,
};
struct wlr_color_transform {
int ref_count;
struct wlr_addon_set addons; // per-renderer helper state
enum wlr_color_transform_type type;
};
/**
* The formula is approximated via a 3D look-up table. A 3D LUT is a
* three-dimensional array where each element is an RGB triplet. The flat lut_3d
* array has a length of dim_len³.
*
* Color channel values in the range [0.0, 1.0] are mapped linearly to
* 3D LUT indices such that 0.0 maps exactly to the first element and 1.0 maps
* exactly to the last element in each dimension.
*
* The offset of the RGB triplet given red, green and blue indices r_index,
* g_index and b_index is:
*
* offset = 3 * (r_index + dim_len * g_index + dim_len * dim_len * b_index)
*/
struct wlr_color_transform_lut3d {
struct wlr_color_transform base;
float *lut_3d;
size_t dim_len;
};
/**
* Gets a wlr_color_transform_lut3d from a generic wlr_color_transform.
* Asserts that the base type is COLOR_TRANSFORM_LUT_3D
*/
struct wlr_color_transform_lut3d *wlr_color_transform_lut3d_from_base(
struct wlr_color_transform *tr);
/**
* Obtain primaries values from a well-known primaries name.
*/
void wlr_color_primaries_from_named(struct wlr_color_primaries *out,
enum wlr_color_named_primaries named);
/**
* Compute the matrix to convert RGB color values to CIE 1931 XYZ.
*/
void wlr_color_primaries_to_xyz(const struct wlr_color_primaries *primaries, float matrix[static 9]);
/**
* Get default luminances for a transfer function.
*/
void wlr_color_transfer_function_get_default_luminance(enum wlr_color_transfer_function tf,
struct wlr_color_luminances *lum);
#endif
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