2 files changed, 19 insertions, 0 deletions
diff --git a/src/gbm/main/gbm.c b/src/gbm/main/gbm.c
index 0bf2922bacd..d301661b48e 100644
--- a/src/gbm/main/gbm.c
+++ b/src/gbm/main/gbm.c
@@ -695,3 +695,19 @@ gbm_surface_has_free_buffers(struct gbm_surface *surf)
 {
    return surf->gbm->surface_has_free_buffers(surf);
 }
+
+/* The two GBM_BO_FORMAT_[XA]RGB8888 formats alias the GBM_FORMAT_*
+ * formats of the same name. We want to accept them whenever someone
+ * has a GBM format, but never return them to the user. */
+uint32_t
+gbm_format_canonicalize(uint32_t gbm_format)
+{
+   switch (gbm_format) {
+   case GBM_BO_FORMAT_XRGB8888:
+      return GBM_FORMAT_XRGB8888;
+   case GBM_BO_FORMAT_ARGB8888:
+      return GBM_FORMAT_ARGB8888;
+   default:
+      return gbm_format;
+   }
+}
diff --git a/src/gbm/main/gbmint.h b/src/gbm/main/gbmint.h
index 9220a4ae87d..192577431e2 100644
--- a/src/gbm/main/gbmint.h
+++ b/src/gbm/main/gbmint.h
@@ -133,4 +133,7 @@ struct gbm_backend {
    struct gbm_device *(*create_device)(int fd);
 };
 
+uint32_t
+gbm_format_canonicalize(uint32_t gbm_format);
+
 #endif