From 1b0eda7141637c145e43207952a06694eb3d21cd Mon Sep 17 00:00:00 2001
From: George Wright <george@mozilla.com>
Date: Wed, 29 Feb 2012 16:55:46 -0500
Subject: [PATCH] Bug 674753 - Add support for loading apitrace explicitly on
 Android - r=jrmuizel,bjacob

---
 gfx/gl/GLContextProviderEGL.cpp | 71 ++++++++++++++++++++++++++++-----
 1 file changed, 60 insertions(+), 11 deletions(-)

diff --git a/gfx/gl/GLContextProviderEGL.cpp b/gfx/gl/GLContextProviderEGL.cpp
index 97a49731457f..7f9ed0022b44 100644
--- a/gfx/gl/GLContextProviderEGL.cpp
+++ b/gfx/gl/GLContextProviderEGL.cpp
@@ -39,6 +39,7 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
+#include "mozilla/Preferences.h"
 #include "mozilla/Util.h"
 
 #if defined(XP_UNIX)
@@ -69,6 +70,12 @@
 #include "AndroidBridge.h"
 #endif
 #include <android/log.h>
+
+// We only need to explicitly dlopen egltrace
+// on android as we can use LD_PRELOAD or other tricks
+// on other platforms. We look for it in /data/local
+// as that's writeable by all users
+#define APITRACE_LIB "/data/local/egltrace.so"
 #endif
 
 #define EGL_LIB "libEGL.so"
@@ -227,6 +234,38 @@ static EGLint gContextAttribsRobustness[] = {
     LOCAL_EGL_NONE
 };
 
+static PRLibrary* LoadApitraceLibrary()
+{
+    PRLibrary* sApitraceLibrary = NULL;
+
+    if (sApitraceLibrary)
+        return sApitraceLibrary;
+
+#if defined(ANDROID)
+    nsCString logFile = Preferences::GetCString("gfx.apitrace.logfile");
+
+    if (logFile.IsEmpty()) {
+        logFile = "firefox.trace";
+    }
+
+    // The firefox process can't write to /data/local, but it can write
+    // to $GRE_HOME/
+    nsCAutoString logPath;
+    logPath.AppendPrintf("%s/%s", getenv("GRE_HOME"), logFile.get());
+
+    // apitrace uses the TRACE_FILE environment variable to determine where
+    // to log trace output to
+    printf_stderr("Logging GL tracing output to %s", logPath.get());
+    setenv("TRACE_FILE", logPath.get(), false);
+
+    printf_stderr("Attempting load of %s\n", APITRACE_LIB);
+
+    sApitraceLibrary = PR_LoadLibrary(APITRACE_LIB);
+#endif
+
+    return sApitraceLibrary;
+}
+
 static int
 next_power_of_two(int v)
 {
@@ -650,12 +689,17 @@ public:
 #endif
 
         if (!mEGLLibrary) {
-            mEGLLibrary = PR_LoadLibrary(EGL_LIB);
-#if defined(XP_UNIX)
+            mEGLLibrary = LoadApitraceLibrary();
+
             if (!mEGLLibrary) {
-                mEGLLibrary = PR_LoadLibrary(EGL_LIB1);
-            }
+                printf_stderr("Attempting load of %s\n", EGL_LIB);
+                mEGLLibrary = PR_LoadLibrary(EGL_LIB);
+#if defined(XP_UNIX)
+                if (!mEGLLibrary) {
+                    mEGLLibrary = PR_LoadLibrary(EGL_LIB1);
+                }
 #endif
+            }
         }
 
         if (!mEGLLibrary) {
@@ -1019,14 +1063,19 @@ public:
 
     bool Init()
     {
-        if (!OpenLibrary(GLES2_LIB)) {
-#if defined(XP_UNIX)
-            if (!OpenLibrary(GLES2_LIB2)) {
-                NS_WARNING("Couldn't load EGL LIB.");
-            }
+#if defined(ANDROID)
+        // We can't use LoadApitraceLibrary here because the GLContext
+        // expects its own handle to the GL library
+        if (!OpenLibrary(APITRACE_LIB))
 #endif
-            return false;
-        }
+            if (!OpenLibrary(GLES2_LIB)) {
+#if defined(XP_UNIX)
+                if (!OpenLibrary(GLES2_LIB2)) {
+                    NS_WARNING("Couldn't load GLES2 LIB.");
+                    return false;
+                }
+#endif
+            }
 
         bool current = MakeCurrent();
         if (!current) {