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39 lines
1 KiB
C
39 lines
1 KiB
C
#ifndef RENDER_COLOR_H
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#define RENDER_COLOR_H
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#include <stdint.h>
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#include <wlr/util/addon.h>
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/**
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* The formula is approximated via a 3D look-up table. A 3D LUT is a
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* three-dimensional array where each element is an RGB triplet. The flat lut_3d
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* array has a length of dim_len³.
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*
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* Color channel values in the range [0.0, 1.0] are mapped linearly to
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* 3D LUT indices such that 0.0 maps exactly to the first element and 1.0 maps
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* exactly to the last element in each dimension.
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*
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* The offset of the RGB triplet given red, green and blue indices r_index,
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* g_index and b_index is:
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*
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* offset = 3 * (r_index + dim_len * g_index + dim_len * dim_len * b_index)
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*/
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struct wlr_color_transform_lut3d {
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float *lut_3d;
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size_t dim_len;
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};
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enum wlr_color_transform_type {
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COLOR_TRANSFORM_SRGB,
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COLOR_TRANSFORM_LUT_3D,
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};
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struct wlr_color_transform {
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int ref_count;
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struct wlr_addon_set addons; // per-renderer helper state
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enum wlr_color_transform_type type;
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struct wlr_color_transform_lut3d lut3d;
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};
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#endif
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