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backend/drm: Add pixel blend mode properties

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This commit is contained in:
YaoBing Xiao 2026-03-26 10:07:27 +08:00
parent 413664e0b0
commit b09160aa3e
6 changed files with 22 additions and 1 deletions
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5
backend/drm/atomic.c
View file

@ -474,6 +474,11 @@ static void set_plane_props(struct atomic *atom, struct wlr_drm_backend *drm,
atomic_add(atom, id, props->crtc_y, dst_box->y);
atomic_add(atom, id, props->crtc_w, dst_box->width);
atomic_add(atom, id, props->crtc_h, dst_box->height);
if (props->pixel_blend_mode != 0) {
enum wlr_drm_pixel_blend_mode blend_mode = fb->has_alpha ?
WLR_DRM_BLEND_PREMULTI : WLR_DRM_BLEND_PIXEL_NONE;
atomic_add(atom, id, props->pixel_blend_mode, blend_mode);
}
}
static void set_color_encoding_and_range(struct atomic *atom,

1
backend/drm/fb.c
View file

@ -196,6 +196,7 @@ static struct wlr_drm_fb *drm_fb_create(struct wlr_drm_backend *drm,
fb->backend = drm;
fb->wlr_buf = buf;
fb->has_alpha = pixel_format_has_alpha(attribs.format);
wlr_addon_init(&fb->addon, &buf->addons, drm, &fb_addon_impl);
wl_list_insert(&drm->fbs, &fb->link);

7
backend/drm/libliftoff.c
View file

@ -159,6 +159,10 @@ static bool set_plane_props(struct wlr_drm_plane *plane,
}
// The src_* properties are in 16.16 fixed point
enum wlr_drm_pixel_blend_mode blend_mode = fb->has_alpha ?
WLR_DRM_BLEND_PREMULTI : WLR_DRM_BLEND_PIXEL_NONE;
bool set_blend_mode = plane->props.pixel_blend_mode == 0 ||
liftoff_layer_set_property(layer, "pixel blend mode", blend_mode) == 0;
return liftoff_layer_set_property(layer, "zpos", zpos) == 0 &&
liftoff_layer_set_property(layer, "SRC_X", src_box->x * (1 << 16)) == 0 &&
liftoff_layer_set_property(layer, "SRC_Y", src_box->y * (1 << 16)) == 0 &&
@ -168,7 +172,8 @@ static bool set_plane_props(struct wlr_drm_plane *plane,
liftoff_layer_set_property(layer, "CRTC_Y", dst_box->y) == 0 &&
liftoff_layer_set_property(layer, "CRTC_W", dst_box->width) == 0 &&
liftoff_layer_set_property(layer, "CRTC_H", dst_box->height) == 0 &&
liftoff_layer_set_property(layer, "FB_ID", fb->id) == 0;
liftoff_layer_set_property(layer, "FB_ID", fb->id) == 0 &&
set_blend_mode;
}
static bool disable_plane(struct wlr_drm_plane *plane) {

1
backend/drm/properties.c
View file

@ -68,6 +68,7 @@ static const struct prop_info plane_info[] = {
{ "SRC_W", INDEX(src_w) },
{ "SRC_X", INDEX(src_x) },
{ "SRC_Y", INDEX(src_y) },
{ "pixel blend mode", INDEX(pixel_blend_mode) },
{ "rotation", INDEX(rotation) },
{ "type", INDEX(type) },
#undef INDEX

1
include/backend/drm/fb.h
View file

@ -14,6 +14,7 @@ struct wlr_drm_fb {
struct wl_list link; // wlr_drm_backend.fbs
uint32_t id;
bool has_alpha;
};
bool drm_fb_import(struct wlr_drm_fb **fb, struct wlr_drm_backend *drm,

8
include/backend/drm/properties.h
View file

@ -48,6 +48,7 @@ struct wlr_drm_plane_props {
uint32_t rotation; // Not guaranteed to exist
uint32_t in_formats; // Not guaranteed to exist
uint32_t size_hints; // Not guaranteed to exist
uint32_t pixel_blend_mode; // Not guaranteed to exist
// atomic-modesetting only
@ -83,6 +84,13 @@ enum wlr_drm_color_range {
WLR_DRM_COLOR_YCBCR_LIMITED_RANGE,
};
// Equivalent to drm_mode_blend_mode defined in the kernel
enum wlr_drm_pixel_blend_mode {
WLR_DRM_BLEND_PREMULTI,
WLR_DRM_BLEND_COVERAGE,
WLR_DRM_BLEND_PIXEL_NONE,
};
bool get_drm_connector_props(int fd, uint32_t id,
struct wlr_drm_connector_props *out);
bool get_drm_crtc_props(int fd, uint32_t id, struct wlr_drm_crtc_props *out);