commit e86506ac35ebb09b6a495d6c8039f35cf699f589
author Shivaraj Shetty <shivaraj@codeaurora.org> Tue Aug 06 12:56:30 2013 +0530
committer Radhika Ranjan Soni <rrsoni@codeaurora.org> Wed Aug 14 17:48:52 2013 +0530
tree c3cee88fcdf03d0c5fc2b3f437f3ce9826ecd138
parent a95205f56ce71464cbbe5cb7f2618ed778599222

HWC/copybit : Add support to indicate driver on layer with Zorder 0

Some applications send RGBA layer with constant alpha 0xFF and
isOpaque=1. For these types of layer we don't get any wormHole
regions. Hence we see the previous content (framebuffer) due to
wrong selection of blending logic at kernel side.

To fix these kind of issues on MDP3 we make layer with Z order
zero as FG layer. This makes sure that proper blending logic
is chosen in kernel.

CRs-fixed: 521638
CRs-fixed: 517944
Change-Id: I172a46c3284916264a1413a6a16875afea2b1aad

libhwcomposer/hwc_copybit.cpp

diff --git a/libhwcomposer/hwc_copybit.cpp b/libhwcomposer/hwc_copybit.cpp
index ee06443..24a889c 100644
--- a/libhwcomposer/hwc_copybit.cpp
+++ b/libhwcomposer/hwc_copybit.cpp
@@ -286,7 +286,7 @@
             list->hwLayers[i].acquireFenceFd = -1;
         }
         retVal = drawLayerUsingCopybit(ctx, &(list->hwLayers[i]),
-                                                    renderBuffer, dpy);
+                                                    renderBuffer, dpy, !i);
         copybitLayerCount++;
         if(retVal < 0) {
             ALOGE("%s : drawLayerUsingCopybit failed", __FUNCTION__);
@@ -302,7 +302,7 @@
 }
 
 int  CopyBit::drawLayerUsingCopybit(hwc_context_t *dev, hwc_layer_1_t *layer,
-                                     private_handle_t *renderBuffer, int dpy)
+                          private_handle_t *renderBuffer, int dpy, bool isFG)
 {
     hwc_context_t* ctx = (hwc_context_t*)(dev);
     int err = 0, acquireFd;
@@ -499,6 +499,9 @@
     copybit->set_parameter(copybit, COPYBIT_DITHER,
                              (dst.format == HAL_PIXEL_FORMAT_RGB_565)?
                                              COPYBIT_ENABLE : COPYBIT_DISABLE);
+    copybit->set_parameter(copybit, COPYBIT_FG_LAYER, isFG ?
+                                             COPYBIT_ENABLE : COPYBIT_DISABLE);
+
     copybit->set_parameter(copybit, COPYBIT_BLIT_TO_FRAMEBUFFER,
                                                 COPYBIT_ENABLE);
     copybit->set_sync(copybit, acquireFd);