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74217a4d93
This will be useful to apply LUTs applied via wlr_gamma_control_v1, and to add wlr_color_transform support to wlr_output.
85 lines
2.3 KiB
C
85 lines
2.3 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/render/color.h>
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#include <wlr/util/addon.h>
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enum wlr_color_transform_type {
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COLOR_TRANSFORM_SRGB,
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COLOR_TRANSFORM_LCMS2,
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COLOR_TRANSFORM_LUT_3X1D,
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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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};
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void wlr_color_transform_init(struct wlr_color_transform *tr,
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enum wlr_color_transform_type type);
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/**
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* The formula is approximated via three 1D look-up tables. The flat lut_3x1d
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* array has a length of 3 * dim.
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*
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* The offset of a color value for a given channel and color index is:
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*
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* offset = channel_index * dim + color_index
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*/
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struct wlr_color_transform_lut_3x1d {
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struct wlr_color_transform base;
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uint16_t *lut_3x1d;
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size_t dim;
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};
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/**
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* Get a struct wlr_color_transform_lcms2 from a generic struct wlr_color_transform.
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* Asserts that the base type is COLOR_TRANSFORM_LCMS2.
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*/
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struct wlr_color_transform_lcms2 *color_transform_lcms2_from_base(
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struct wlr_color_transform *tr);
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void color_transform_lcms2_finish(struct wlr_color_transform_lcms2 *tr);
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/**
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* Evaluate a LCMS2 color transform for a given RGB triplet.
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*/
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void color_transform_lcms2_eval(struct wlr_color_transform_lcms2 *tr,
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float out[static 3], const float in[static 3]);
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/**
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* Get a struct wlr_color_transform_lut_3x1d from a generic
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* struct wlr_color_transform. Asserts that the base type is
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* COLOR_TRANSFORM_LUT_3X1D.
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*/
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struct wlr_color_transform_lut_3x1d *color_transform_lut_3x1d_from_base(
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struct wlr_color_transform *tr);
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/**
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* Evaluate a 3x1D LUT color transform for a given RGB triplet.
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*/
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void color_transform_lut_3x1d_eval(struct wlr_color_transform_lut_3x1d *tr,
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float out[static 3], const float in[static 3]);
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/**
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* Obtain primaries values from a well-known primaries name.
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*/
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void wlr_color_primaries_from_named(struct wlr_color_primaries *out,
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enum wlr_color_named_primaries named);
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/**
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* Compute the matrix to convert RGB color values to CIE 1931 XYZ.
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*/
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void wlr_color_primaries_to_xyz(const struct wlr_color_primaries *primaries, float matrix[static 9]);
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/**
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* Get default luminances for a transfer function.
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*/
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void wlr_color_transfer_function_get_default_luminance(enum wlr_color_transfer_function tf,
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struct wlr_color_luminances *lum);
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#endif
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