From cdbaecb54152ce98789823420d426077d72aa1e7 Mon Sep 17 00:00:00 2001
From: Jamie Gennis <jgennis@google.com>
Date: Fri, 12 Oct 2012 14:18:10 -0700
Subject: [PATCH] SurfaceFlinger: make the num FBs a board config

Bug: 7283132
Change-Id: I38116f39fc18212f2daab94bbfc3daaf89439fc4
---
 services/surfaceflinger/Android.mk                          | 4 ++++
 .../surfaceflinger/DisplayHardware/FramebufferSurface.cpp   | 6 +++++-
 .../surfaceflinger/DisplayHardware/FramebufferSurface.h     | 2 --
 3 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/services/surfaceflinger/Android.mk b/services/surfaceflinger/Android.mk
index 0d559e778..5a5769795 100644
--- a/services/surfaceflinger/Android.mk
+++ b/services/surfaceflinger/Android.mk
@@ -38,6 +38,10 @@ ifeq ($(TARGET_DISABLE_TRIPLE_BUFFERING),true)
 	LOCAL_CFLAGS += -DTARGET_DISABLE_TRIPLE_BUFFERING
 endif
 
+ifneq ($(NUM_FRAMEBUFFER_SURFACE_BUFFERS),)
+  LOCAL_CFLAGS += -DNUM_FRAMEBUFFER_SURFACE_BUFFERS=$(NUM_FRAMEBUFFER_SURFACE_BUFFERS)
+endif
+
 LOCAL_SHARED_LIBRARIES := \
 	libcutils \
 	libdl \
diff --git a/services/surfaceflinger/DisplayHardware/FramebufferSurface.cpp b/services/surfaceflinger/DisplayHardware/FramebufferSurface.cpp
index 9ada19712..6c86a53a3 100644
--- a/services/surfaceflinger/DisplayHardware/FramebufferSurface.cpp
+++ b/services/surfaceflinger/DisplayHardware/FramebufferSurface.cpp
@@ -36,6 +36,10 @@
 #include "DisplayHardware/GraphicBufferAlloc.h"
 #include "DisplayHardware/HWComposer.h"
 
+#ifndef NUM_FRAMEBUFFER_SURFACE_BUFFERS
+#define NUM_FRAMEBUFFER_SURFACE_BUFFERS (2)
+#endif
+
 // ----------------------------------------------------------------------------
 namespace android {
 // ----------------------------------------------------------------------------
@@ -61,7 +65,7 @@ FramebufferSurface::FramebufferSurface(HWComposer& hwc, int disp) :
     mBufferQueue->setDefaultBufferFormat(mHwc.getFormat(disp));
     mBufferQueue->setDefaultBufferSize(mHwc.getWidth(disp),  mHwc.getHeight(disp));
     mBufferQueue->setSynchronousMode(true);
-    mBufferQueue->setDefaultMaxBufferCount(NUM_FRAME_BUFFERS);
+    mBufferQueue->setDefaultMaxBufferCount(NUM_FRAMEBUFFER_SURFACE_BUFFERS);
 }
 
 status_t FramebufferSurface::nextBuffer(sp<GraphicBuffer>& outBuffer, sp<Fence>& outFence) {
diff --git a/services/surfaceflinger/DisplayHardware/FramebufferSurface.h b/services/surfaceflinger/DisplayHardware/FramebufferSurface.h
index d64fea78b..633634522 100644
--- a/services/surfaceflinger/DisplayHardware/FramebufferSurface.h
+++ b/services/surfaceflinger/DisplayHardware/FramebufferSurface.h
@@ -22,8 +22,6 @@
 
 #include <gui/ConsumerBase.h>
 
-#define NUM_FRAME_BUFFERS  2
-
 // ---------------------------------------------------------------------------
 namespace android {
 // ---------------------------------------------------------------------------