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Add union function for format sets
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2 changed files with 48 additions and 0 deletions
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@ -72,4 +72,12 @@ bool wlr_drm_format_set_add(struct wlr_drm_format_set *set, uint32_t format,
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bool wlr_drm_format_set_intersect(struct wlr_drm_format_set *dst,
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const struct wlr_drm_format_set *a, const struct wlr_drm_format_set *b);
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/**
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* Unions DRM format set `a` and `b`, storing in the destination set
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* `dst`.
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*
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* Returns false on failure.
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*/
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bool wlr_drm_format_set_union(struct wlr_drm_format_set *dst,
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const struct wlr_drm_format_set *a, const struct wlr_drm_format_set *b);
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#endif
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@ -240,3 +240,43 @@ bool wlr_drm_format_set_intersect(struct wlr_drm_format_set *dst,
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*dst = out;
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return true;
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}
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static bool drm_format_set_extend(struct wlr_drm_format_set *dst,
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const struct wlr_drm_format_set *src) {
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for (size_t i = 0; i < src->len; i++) {
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struct wlr_drm_format *format = src->formats[i];
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for (size_t j = 0; j < format->len; j++) {
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if (!wlr_drm_format_set_add(dst, format->format, format->modifiers[j])) {
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wlr_log_errno(WLR_ERROR, "Adding format/modifier to set failed");
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return false;
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}
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}
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}
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return true;
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}
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bool wlr_drm_format_set_union(struct wlr_drm_format_set *dst,
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const struct wlr_drm_format_set *a, const struct wlr_drm_format_set *b) {
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assert(dst != a && dst != b);
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struct wlr_drm_format_set out = {0};
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out.capacity = a->len + b->len;
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out.formats = calloc(out.capacity, sizeof(struct wlr_drm_format *));
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if (out.formats == NULL) {
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wlr_log_errno(WLR_ERROR, "Allocation failed");
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return false;
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}
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// Add both a and b sets into out
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if (!drm_format_set_extend(&out, a)) {
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return false;
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}
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if (!drm_format_set_extend(&out, b)) {
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return false;
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}
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*dst = out;
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return true;
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}
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