[PATCH 4/6] libEGL: restore SYSTEMUI_PBSIZE_HACK (against android-4.4_r1.2 frameworks/native)

0004-libEGL-restore-SYSTEMUI_PBSIZE_HACK.patch

From 5287313505a027834a809228b23183b968562145 Mon Sep 17 00:00:00 2001
From: Steven Luo <steven+android@steven676.net>
Date: Sat, 2 Nov 2013 23:06:18 -0700
Subject: [PATCH 4/4] libEGL: restore SYSTEMUI_PBSIZE_HACK

This was removed in the otherwise unrelated commit f4486c6... ("try to
keep omap4 alive").

Change-Id: I6b62a3a4332a0376eb6865c2674aaf3f8ef262bd
---
 opengl/libs/Android.mk     |    2 ++
 opengl/libs/EGL/Loader.cpp |   29 +++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/opengl/libs/Android.mk b/opengl/libs/Android.mk
index 43ef27f..55c6c80 100644
--- a/opengl/libs/Android.mk
+++ b/opengl/libs/Android.mk
@@ -53,6 +53,8 @@ ifeq ($(TARGET_BOARD_PLATFORM), omap4)
 endif
 ifeq ($(TARGET_BOARD_PLATFORM), s5pc110)
   LOCAL_CFLAGS += -DWORKAROUND_BUG_10194508=1
+  # see Loader.cpp for details
+  LOCAL_CFLAGS += -DSYSTEMUI_PBSIZE_HACK=1
 endif
 ifneq ($(MAX_EGL_CACHE_ENTRY_SIZE),)
   LOCAL_CFLAGS += -DMAX_EGL_CACHE_ENTRY_SIZE=$(MAX_EGL_CACHE_ENTRY_SIZE)
diff --git a/opengl/libs/EGL/Loader.cpp b/opengl/libs/EGL/Loader.cpp
index 02914a0..beaa560 100644
--- a/opengl/libs/EGL/Loader.cpp
+++ b/opengl/libs/EGL/Loader.cpp
@@ -374,6 +374,35 @@ void *Loader::load_driver(const char* kind,
         ALOGE_IF(!getProcAddress,
                 "can't find eglGetProcAddress() in %s", driver_absolute_path);
 
+#ifdef SYSTEMUI_PBSIZE_HACK
+#warning "SYSTEMUI_PBSIZE_HACK enabled"
+        /*
+         * TODO: replace SYSTEMUI_PBSIZE_HACK by something less hackish
+         *
+         * Here we adjust the PB size from its default value to 512KB which
+         * is the minimum acceptable for the systemui process.
+         * We do this on low-end devices only because it allows us to enable
+         * h/w acceleration in the systemui process while keeping the
+         * memory usage down.
+         *
+         * Obviously, this is the wrong place and wrong way to make this
+         * adjustment, but at the time of this writing this was the safest
+         * solution.
+         */
+        const char *cmdline = getProcessCmdline();
+        if (strstr(cmdline, "systemui")) {
+            void *imgegl = dlopen("/vendor/lib/libIMGegl.so", RTLD_LAZY);
+            if (imgegl) {
+                unsigned int *PVRDefaultPBS =
+                        (unsigned int *)dlsym(imgegl, "PVRDefaultPBS");
+                if (PVRDefaultPBS) {
+                    ALOGD("setting default PBS to 512KB, was %d KB", *PVRDefaultPBS / 1024);
+                    *PVRDefaultPBS = 512*1024;
+                }
+            }
+        }
+#endif
+
         egl_t* egl = &cnx->egl;
         __eglMustCastToProperFunctionPointerType* curr =
             (__eglMustCastToProperFunctionPointerType*)egl;
-- 
1.7.10.4