mirror of
https://gitlab.freedesktop.org/wlroots/wlroots.git
synced 2025-10-28 05:40:11 -04:00
3665b53e29
Converting the LCMS2 transform to a 3D LUT early causes issues: - It's a lossy process, the consumer will not be able to pick a 3D LUT size on their own. - It requires unnecessary conversions and allocations: an intermediate 3D LUT is allocated, but the renderer already allocates one. - It makes it harder to support arbitrary color transforms in the renderer, because each type needs to be handled differently. Instead, expose a function to evaluate a color transform, and use that to build the 3D LUT in the renderer.
55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
#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_LCMS2,
|
|
};
|
|
|
|
struct wlr_color_transform {
|
|
int ref_count;
|
|
struct wlr_addon_set addons; // per-renderer helper state
|
|
|
|
enum wlr_color_transform_type type;
|
|
};
|
|
|
|
void wlr_color_transform_init(struct wlr_color_transform *tr,
|
|
enum wlr_color_transform_type type);
|
|
|
|
/**
|
|
* Get a struct wlr_color_transform_lcms2 from a generic struct wlr_color_transform.
|
|
* Asserts that the base type is COLOR_TRANSFORM_LCMS2.
|
|
*/
|
|
struct wlr_color_transform_lcms2 *color_transform_lcms2_from_base(
|
|
struct wlr_color_transform *tr);
|
|
|
|
void color_transform_lcms2_finish(struct wlr_color_transform_lcms2 *tr);
|
|
|
|
/**
|
|
* Evaluate a LCMS2 color transform for a given RGB triplet.
|
|
*/
|
|
void color_transform_lcms2_eval(struct wlr_color_transform_lcms2 *tr,
|
|
float out[static 3], const float in[static 3]);
|
|
|
|
/**
|
|
* 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
|