commit cc32661b65bade706528571264c5d911bc06a6be
author Ramakant Singh <ramaka@codeaurora.org> Thu Jun 19 14:19:18 2014 +0530
committer Sravan Kumar D.V.N <sravank1@codeaurora.org> Fri Jun 20 16:09:37 2014 +0530
tree a4862104114e6452679077eb4d1a26ac9c1e29f7
parent e606d7b14999328c8851dd373ba3129d3c15562b

hwc : Enable ABC only for non intersecting layers.

To prevent artifact(s), we should enable ABC only in case
of non intersecting layers.

Change-Id: I3dd265e834340dcb298d7b9e06d135a4583a17b8

libhwcomposer/hwc_copybit.cpp

diff --git a/libhwcomposer/hwc_copybit.cpp b/libhwcomposer/hwc_copybit.cpp
index f703fa0..78e71eb 100644
--- a/libhwcomposer/hwc_copybit.cpp
+++ b/libhwcomposer/hwc_copybit.cpp
@@ -415,9 +415,20 @@
        if(layerCount == 1)
           return true;
 
-       if(layerCount == MAX_LAYERS_FOR_ABC) {
-          // Pass the Acquire Fence FD to driver for base layer
+       if(layerCount ==  MAX_LAYERS_FOR_ABC) {
           int abcRenderBufIdx = ctx->listStats[dpy].renderBufIndexforABC;
+          //enable ABC only for non intersecting layers.
+          hwc_rect_t displayFrame =
+                  list->hwLayers[abcRenderBufIdx].displayFrame;
+          for (int i = abcRenderBufIdx + 1; i < layerCount; i++) {
+             hwc_rect_t tmpDisplayFrame = list->hwLayers[i].displayFrame;
+             hwc_rect_t result = getIntersection(displayFrame,tmpDisplayFrame);
+             if (isValidRect(result)) {
+                ctx->listStats[dpy].renderBufIndexforABC = -1;
+                return false;
+             }
+          }
+          // Pass the Acquire Fence FD to driver for base layer
           private_handle_t *renderBuffer =
           (private_handle_t *)list->hwLayers[abcRenderBufIdx].handle;
           copybit_device_t *copybit = getCopyBitDevice();
@@ -425,7 +436,7 @@
              copybit->set_sync(copybit,
              list->hwLayers[abcRenderBufIdx].acquireFenceFd);
           }
-          for(int i = 1; i < layerCount; i++){
+          for(int i = abcRenderBufIdx + 1; i < layerCount; i++){
              int retVal = drawLayerUsingCopybit(ctx,
                &(list->hwLayers[i]),renderBuffer, 0);
              if(retVal < 0) {