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render/drm_format_set: introduce wlr_drm_format_intersect
Intersects modifiers from two wlr_drm_format structs. If either format doesn't support modifiers, the resulting format won't support modifiers.
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2 changed files with 45 additions and 0 deletions
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@ -4,5 +4,14 @@
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#include <wlr/render/drm_format_set.h>
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struct wlr_drm_format *wlr_drm_format_dup(const struct wlr_drm_format *format);
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/**
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* Intersect modifiers for two DRM formats.
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*
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* Both arguments must have the same format field. If the formats aren't
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* compatible, NULL is returned. If either format doesn't support any modifier,
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* a format that doesn't support any modifier is returned.
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*/
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struct wlr_drm_format *wlr_drm_format_intersect(
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const struct wlr_drm_format *a, const struct wlr_drm_format *b);
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#endif
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@ -137,3 +137,39 @@ struct wlr_drm_format *wlr_drm_format_dup(const struct wlr_drm_format *format) {
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memcpy(duped_format, format, format_size);
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return duped_format;
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}
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struct wlr_drm_format *wlr_drm_format_intersect(
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const struct wlr_drm_format *a, const struct wlr_drm_format *b) {
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assert(a->format == b->format);
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size_t format_cap = a->len < b->len ? a->len : b->len;
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size_t format_size = sizeof(struct wlr_drm_format) +
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format_cap * sizeof(a->modifiers[0]);
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struct wlr_drm_format *format = calloc(1, format_size);
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if (format == NULL) {
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wlr_log_errno(WLR_ERROR, "Allocation failed");
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return NULL;
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}
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format->format = a->format;
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format->cap = format_cap;
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for (size_t i = 0; i < a->len; i++) {
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for (size_t j = 0; j < b->len; j++) {
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if (a->modifiers[i] == b->modifiers[j]) {
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assert(format->len < format->cap);
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format->modifiers[format->len] = a->modifiers[i];
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format->len++;
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break;
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}
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}
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}
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// If both formats support modifiers, but the intersection is empty, then
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// the formats aren't compatible with each other
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if (format->len == 0 && a->len > 0 && b->len > 0) {
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free(format);
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return NULL;
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}
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return format;
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}
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