[Mesa-dev] [PATCH 09/11] intel: Add support for blitting 6 byte-per-pixel formats.

[Eric Anholt]

The next commit introduces what is apparently our first one, which tripped
over this in glReadPixels.
---
 src/mesa/drivers/dri/intel/intel_blit.c |   21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/src/mesa/drivers/dri/intel/intel_blit.c b/src/mesa/drivers/dri/intel/intel_blit.c
index 1f3fad5..cc2fa70 100644
--- a/src/mesa/drivers/dri/intel/intel_blit.c
+++ b/src/mesa/drivers/dri/intel/intel_blit.c
@@ -150,15 +150,22 @@ intelEmitCopyBlit(struct intel_context *intel,
    if (src_pitch % 4 != 0 || dst_pitch % 4 != 0)
       return false;
 
-   /* For big formats (such as floating point), do the copy using 32bpp and
-    * multiply the coordinates.
+   /* For big formats (such as floating point), do the copy using 16 or 32bpp
+    * and multiply the coordinates.
     */
    if (cpp > 4) {
-      assert(cpp % 4 == 0);
-      dst_x *= cpp / 4;
-      dst_x2 *= cpp / 4;
-      src_x *= cpp / 4;
-      cpp = 4;
+      if (cpp % 4 == 2) {
+         dst_x *= cpp / 2;
+         dst_x2 *= cpp / 2;
+         src_x *= cpp / 2;
+         cpp = 2;
+      } else {
+         assert(cpp % 4 == 0);
+         dst_x *= cpp / 4;
+         dst_x2 *= cpp / 4;
+         src_x *= cpp / 4;
+         cpp = 4;
+      }
    }
 
    BR13 = br13_for_cpp(cpp) | translate_raster_op(logic_op) << 16;
-- 
1.7.10.4