gbm: track buffer format through DRI drivers

GBM needs the buffer format in order to communicate with DRM and clients
for things like scanout.

So track the DRI format requested in the various back ends and use it to
return the DRI format back to GBM when requested.  GBM will then map
this into the GBM surface type (which is in turn based on the DRM fb
format list).

Signed-off-by: Jesse Barnes <[email protected]>

1 files changed, 13 insertions, 0 deletions

diff --git a/src/gbm/main/gbm.c b/src/gbm/main/gbm.c
index 03fc52b161a..9459720261f 100644
--- a/src/gbm/main/gbm.c
+++ b/src/gbm/main/gbm.c
@@ -205,6 +205,19 @@ gbm_bo_get_pitch(struct gbm_bo *bo)
    return bo->pitch;
 }
 
+/** Get the format of the buffer object
+ *
+ * The format of the pixels in the buffer.
+ *
+ * \param bo The buffer object
+ * \return The format of buffer object, on of the GBM_FORMAT_* codes
+ */
+GBM_EXPORT uint32_t
+gbm_bo_get_format(struct gbm_bo *bo)
+{
+   return bo->format;
+}
+
 /** Get the handle of the buffer object
  *
  * This is stored in the platform generic union gbm_bo_handle type. However