DRI2: Do not send the real front buffer of a window to the client

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/glx/glxdri2.c b/glx/glxdri2.c
index c896536c8..ea5b5ef72 100644
--- a/glx/glxdri2.c
+++ b/glx/glxdri2.c
@@ -406,6 +406,7 @@ dri2GetBuffers(__DRIdrawable *driDrawable,
     __GLXDRIdrawable *private = loaderPrivate;
     DRI2BufferPtr buffers;
     int i;
+    int skip = 0;
 
     buffers = DRI2GetBuffers(private->base.pDraw,
 			     width, height, attachments, count, out_count);
@@ -420,6 +421,14 @@ dri2GetBuffers(__DRIdrawable *driDrawable,
     /* This assumes the DRI2 buffer attachment tokens matches the
      * __DRIbuffer tokens. */
     for (i = 0; i < *out_count; i++) {
+	/* Do not send the real front buffer of a window to the client.
+	 */
+	if ((private->base.pDraw->type == DRAWABLE_WINDOW)
+	    && (buffers[i].attachment == DRI2BufferFrontLeft)) {
+	    skip++;
+	    continue;
+	}
+
 	private->buffers[i].attachment = buffers[i].attachment;
 	private->buffers[i].name = buffers[i].name;
 	private->buffers[i].pitch = buffers[i].pitch;
@@ -427,6 +436,7 @@ dri2GetBuffers(__DRIdrawable *driDrawable,
 	private->buffers[i].flags = buffers[i].flags;
     }
 
+    *out_count -= skip;
     return private->buffers;
 }