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render/color: Add COLOR_TRANSFORM_LUT_3x1D type

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This commit is contained in:
Alexander Orzechowski 2024-08-24 12:57:21 -04:00
parent 75cf7ceec9
commit 3a5dd80d20
2 changed files with 50 additions and 0 deletions
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38
include/render/color.h
View file

@ -7,6 +7,7 @@
enum wlr_color_transform_type {
COLOR_TRANSFORM_SRGB,
COLOR_TRANSFORM_LUT_3D,
COLOR_TRANSFORM_LUT_3x1D,
};
struct wlr_color_transform {
@ -37,6 +38,36 @@ struct wlr_color_transform_lut3d {
size_t dim_len;
};
/**
* This is a color transform that is specified by three seperate ramps that
* modify the RGB values individually. This means that this color transform type
* cannot be used to create a transform that can infruence color channels
* depending on the values of other color channels.
*
* This color transform is modeled off of the wlr-gamma-control-unstable-v1
* wayland protocol.
*
* The memory layout of this type requires that the r, g, b color channel ramps
* are inline in memory. A ramp value can be retrieved from memory:
*
* offset = dim_len * rgb_channel_index + ramp_index
*
* This is an offset into the `r` pointer and can be used to retrieve the ramps
* from the other channels as the ramps are linear in memory. The three pointers
* are given for convenience.
*
* Note that when freeing the color transform, only the `r` channel is freed as
* a it's expected that a single malloc will allocate all three channels at once.
*/
struct wlr_color_transform_lut3x1d {
struct wlr_color_transform base;
uint16_t *r;
uint16_t *g;
uint16_t *b;
size_t ramp_size;
};
/**
* Gets a wlr_color_transform_lut3d from a generic wlr_color_transform.
* Asserts that the base type is COLOR_TRANSFORM_LUT_3D
@ -44,4 +75,11 @@ struct wlr_color_transform_lut3d {
struct wlr_color_transform_lut3d *wlr_color_transform_lut3d_from_base(
struct wlr_color_transform *tr);
/**
* Gets a wlr_color_transform_lut3x1d from a generic wlr_color_transform.
* Asserts that the base type is COLOR_TRANSFORM_LUT_3x1D
*/
struct wlr_color_transform_lut3x1d *wlr_color_transform_lut3x1d_from_base(
struct wlr_color_transform *tr);
#endif

12
render/color.c
View file

@ -23,6 +23,11 @@ static void color_transform_destroy(struct wlr_color_transform *tr) {
wlr_color_transform_lut3d_from_base(tr);
free(lut3d->lut_3d);
break;
case COLOR_TRANSFORM_LUT_3x1D:;
struct wlr_color_transform_lut3x1d *lut3x1d =
wlr_color_transform_lut3x1d_from_base(tr);
free(lut3x1d->r);
break;
}
wlr_addon_set_finish(&tr->addons);
free(tr);
@ -50,3 +55,10 @@ struct wlr_color_transform_lut3d *wlr_color_transform_lut3d_from_base(
struct wlr_color_transform_lut3d *lut3d = wl_container_of(tr, lut3d, base);
return lut3d;
}
struct wlr_color_transform_lut3x1d *wlr_color_transform_lut3x1d_from_base(
struct wlr_color_transform *tr) {
assert(tr->type == COLOR_TRANSFORM_LUT_3x1D);
struct wlr_color_transform_lut3x1d *lut = wl_container_of(tr, lut, base);
return lut;
}