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authorSimon Ser <contact@emersion.fr>2021-12-01 13:35:50 +0100
committerSimon Zeni <simon@bl4ckb0ne.ca>2021-12-03 14:42:41 +0000
commit7201aae3d607ad121ea0dfb3a50eb2c3f65b7d85 (patch)
tree3b0851a1e21756f65af9df962cda5ef9ca95e30a /render
parent92080b3a014d92af628de964e66aca705da3041d (diff)
render/drm-format-set: add wlr_drm_format_set_intersect
This intersects two DRM format sets. This is useful for implementing DMA-BUF feedback in compositors, see e.g. the Sway PR [1]. [1]: https://github.com/swaywm/sway/pull/6313
Diffstat (limited to 'render')
-rw-r--r--render/drm_format_set.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/render/drm_format_set.c b/render/drm_format_set.c
index 82997eda..13471746 100644
--- a/render/drm_format_set.c
+++ b/render/drm_format_set.c
@@ -175,3 +175,41 @@ struct wlr_drm_format *wlr_drm_format_intersect(
return format;
}
+
+bool wlr_drm_format_set_intersect(struct wlr_drm_format_set *dst,
+ const struct wlr_drm_format_set *a, const struct wlr_drm_format_set *b) {
+ assert(dst != a && dst != b);
+
+ struct wlr_drm_format_set out = {0};
+ out.capacity = a->len < b->len ? a->len : b->len;
+ out.formats = calloc(out.capacity, sizeof(struct wlr_drm_format *));
+ if (out.formats == NULL) {
+ wlr_log_errno(WLR_ERROR, "Allocation failed");
+ return false;
+ }
+
+ for (size_t i = 0; i < a->len; i++) {
+ for (size_t j = 0; j < b->len; j++) {
+ if (a->formats[i]->format == b->formats[j]->format) {
+ // When the two formats have no common modifier, keep
+ // intersecting the rest of the formats: they may be compatible
+ // with each other
+ struct wlr_drm_format *format =
+ wlr_drm_format_intersect(a->formats[i], b->formats[j]);
+ if (format != NULL) {
+ out.formats[out.len] = format;
+ out.len++;
+ }
+ break;
+ }
+ }
+ }
+
+ if (out.len == 0) {
+ wlr_drm_format_set_finish(&out);
+ return false;
+ }
+
+ *dst = out;
+ return true;
+}