hwc: display hal should report drawLayerUsingCopybit failure.

Display HAL should report drawLayerUsingCopybit failure otherwise
framework assumes HWC layers have been drawn and do not fallback
to GPU, which leads to flickers.

Change-Id: I0bb801d6b48dce143b2c917eaa77d0474c5a34f8

patch/ics_strawberry/hardware/qcom/display/0001-hwc-display-hal-should-report-drawLayerUsingCopybit-.patch

+From 2cc3d4d9d547866e7fc1b2c38ab27cc9dda4775b Mon Sep 17 00:00:00 2001
+From: Sushil Chauhan <sushilchauhan@codeaurora.org>
+Date: Tue, 10 Sep 2013 15:51:12 -0700
+Subject: [PATCH] hwc: display hal should report drawLayerUsingCopybit failure.
+
+Display HAL should report drawLayerUsingCopybit failure otherwise
+framework assumes HWC layers have been drawn and do not fallback
+to GPU, which leads to flickers.
+
+Change-Id: Id7366701016eb7f66bc0cf0b23ea7a5b911741a3
+---
+ libhwcomposer/a-family/hwcomposer.cpp | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/libhwcomposer/a-family/hwcomposer.cpp b/libhwcomposer/a-family/hwcomposer.cpp
+index 3c0f1db..f0b21f0 100644
+--- a/libhwcomposer/a-family/hwcomposer.cpp
++++ b/libhwcomposer/a-family/hwcomposer.cpp
+@@ -1879,17 +1879,21 @@ static int hwc_set(hwc_composer_device_t *dev,
+                     ctx->idleInvalidator->markForSleep();
+                 drawLayerUsingBypass(ctx, &(list->hwLayers[i]), i);
+ #endif
+             } else if (list->hwLayers[i].compositionType == HWC_USE_OVERLAY) {
+                 drawLayerUsingOverlay(ctx, &(list->hwLayers[i]));
+             } else if (list->flags & HWC_SKIP_COMPOSITION) {
+                 continue;
+             } else if (list->hwLayers[i].compositionType == HWC_USE_COPYBIT) {
+-                drawLayerUsingCopybit(dev, &(list->hwLayers[i]), (EGLDisplay)dpy, (EGLSurface)sur);
++                ret = drawLayerUsingCopybit(dev, &(list->hwLayers[i]), (EGLDisplay)dpy, (EGLSurface)sur);
++                if (ret < 0) {
++                    LOGE("%s: Copybit layer draw failed!", __FUNCTION__);
++                    return ret;
++                }
+             }
+         }
+     } else {
+             if (ctx->hwcOverlayStatus == HWC_OVERLAY_OPEN)
+                 ctx->hwcOverlayStatus =  HWC_OVERLAY_PREPARE_TO_CLOSE;
+     }
+ 
+     bool canSkipComposition = list && list->flags & HWC_SKIP_COMPOSITION;
+-- 
+1.8.2.1
+