commit c235bda7c27955fe199206eef90172ae78c60fb9
author Terence Hampson <thampson@codeaurora.org> Fri Jul 12 12:47:38 2013 -0400
committer Terence Hampson <thampson@codeaurora.org> Thu Jul 18 13:52:17 2013 -0400
tree bf52e8e0214f651002307e7449e8a24f28166644
parent 21028318fd3eb2e16126835218f1e1056c7510b3

hwc: Use gpu composition when there is rotation

Mdp3 has a hw issue where it cannot handle rotation and blending,
when roi height or width is not divisible by 16. When roi is not
divisible by 16 mdp3 would read memory that it is beyond the
image. This leads to page faults, which further leads to poor
performance.

Change-Id: I2cd1b77c21c407503399630cdb702b575aa4e64e

libhwcomposer/hwc_copybit.cpp

diff --git a/libhwcomposer/hwc_copybit.cpp b/libhwcomposer/hwc_copybit.cpp
index 287c11d..804257f 100644
--- a/libhwcomposer/hwc_copybit.cpp
+++ b/libhwcomposer/hwc_copybit.cpp
@@ -166,6 +166,17 @@
     private_handle_t *fbHnd = (private_handle_t *)fbLayer->handle;
 
 
+    // Avoid issue with mdp3 and rotation by using gpu composition
+    if (qdutils::MDPVersion::getInstance().getMDPVersion() < 400) {
+        for (int i = ctx->listStats[dpy].numAppLayers-1; i >= 0 ; i--) {
+            hwc_layer_1_t *layer = (hwc_layer_1_t *) &list->hwLayers[i];
+            if ((layer->transform & (HAL_TRANSFORM_FLIP_H |
+                   HAL_TRANSFORM_FLIP_V | HAL_TRANSFORM_ROT_90)) &&
+                   ((layer->displayFrame.bottom - layer->displayFrame.top) % 16 ||
+                   (layer->displayFrame.right - layer->displayFrame.left) % 16))
+                return true;
+        }
+    }
 
     //Allocate render buffers if they're not allocated
     if (useCopybitForYUV || useCopybitForRGB) {