commit 0def28c653ec1f0b10153a0252a004a047d774e9
author Ramakant Singh <ramaka@codeaurora.org> Fri Mar 28 20:43:13 2014 +0530
committer Sravan Kumar D.V.N <sravank1@codeaurora.org> Mon May 26 13:56:36 2014 +0530
tree 5a627f407c6857d10ecc092d6bb93d026b3d2d40
parent b0f6b4cc4950a58197d691a6deee403725cdadae

hwc : Add support for single layer Bypass in MDP3

If the display list contains single layer and that layer
has same properties as Frame Buffer, avoid BLIT on Frame buffer
and pass it directly to display.

Change-Id: I24decaca4788432a55b550caa2a1354a670cd6fa

libhwcomposer/hwc_utils.cpp

diff --git a/libhwcomposer/hwc_utils.cpp b/libhwcomposer/hwc_utils.cpp
index 972f12f..ea3aecb 100644
--- a/libhwcomposer/hwc_utils.cpp
+++ b/libhwcomposer/hwc_utils.cpp
@@ -274,6 +274,10 @@
         ctx->mMDPDownscaleEnabled = true;
     }
 
+    ctx->enableABC = false;
+    property_get("debug.sf.hwc.canUseABC", value, "0");
+    ctx->enableABC  = atoi(value) ? true : false;
+
     // Initialize gpu perfomance hint related parameters
     property_get("sys.hwc.gpu_perf_mode", value, "0");
 #ifdef QCOM_BSP
@@ -838,6 +842,7 @@
     ctx->listStats[dpy].yuv4k2kCount = 0;
     ctx->mViewFrame[dpy] = (hwc_rect_t){0, 0, 0, 0};
     ctx->dpyAttr[dpy].mActionSafePresent = isActionSafePresent(ctx, dpy);
+    ctx->listStats[dpy].renderBufIndexforABC = -1;
 
     resetROI(ctx, dpy);
 
@@ -1323,7 +1328,8 @@
     }
 
     for(uint32_t i = 0; i < list->numHwLayers; i++) {
-        if(list->hwLayers[i].compositionType == HWC_OVERLAY &&
+        if(((isAbcInUse(ctx)== true ) ||
+          (list->hwLayers[i].compositionType == HWC_OVERLAY)) &&
                         list->hwLayers[i].acquireFenceFd >= 0) {
             if(UNLIKELY(swapzero))
                 acquireFd[count++] = -1;
@@ -1379,7 +1385,9 @@
             } else if(list->hwLayers[i].releaseFenceFd < 0 ) {
 #ifdef QCOM_BSP
                 //If rotator has not already populated this field
-                if(list->hwLayers[i].compositionType == HWC_BLIT) {
+                // & if it's a not VPU layer
+                if((list->hwLayers[i].compositionType == HWC_BLIT)&&
+                                        (isAbcInUse(ctx) == false)){
                     //For Blit, the app layers should be released when the Blit is
                     //complete. This fd was passed from copybit->draw
                     list->hwLayers[i].releaseFenceFd = dup(fd);
@@ -2017,6 +2025,10 @@
     ctx->layerProp[dpy] = new LayerProp[numAppLayers];
 }
 
+bool isAbcInUse(hwc_context_t *ctx){
+  return (ctx->enableABC && ctx->listStats[0].renderBufIndexforABC == 0);
+}
+
 /* Since we fake non-Hybrid WFD solution as external display, this
  * function helps us in determining the priority between external
  * (hdmi/non-Hybrid WFD display) and virtual display devices(SSD/