From 92bc8c263111f9393706d8efbc7be0c1a9fae52d Mon Sep 17 00:00:00 2001
From: Joe Drew <joe@drew.ca>
Date: Fri, 27 Aug 2010 22:44:37 -0400
Subject: [PATCH] Bug 591139 - Disable hardware acceleration in safe mode.
 r=bas a=blocking2.0:beta5+

---
 gfx/thebes/gfxWindowsPlatform.cpp     | 11 +++++++++--
 widget/src/windows/nsWindow.cpp       |  9 ++++++++-
 widget/src/xpwidgets/nsBaseWidget.cpp |  8 +++++++-
 3 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/gfx/thebes/gfxWindowsPlatform.cpp b/gfx/thebes/gfxWindowsPlatform.cpp
index 4cdd5f23f189..a285e71696f3 100644
--- a/gfx/thebes/gfxWindowsPlatform.cpp
+++ b/gfx/thebes/gfxWindowsPlatform.cpp
@@ -54,6 +54,7 @@
 #include "nsIWindowsRegKey.h"
 #include "nsILocalFile.h"
 #include "plbase64.h"
+#include "nsIXULRuntime.h"
 
 #ifdef MOZ_FT2_FONTS
 #include "ft2build.h"
@@ -237,7 +238,12 @@ gfxWindowsPlatform::gfxWindowsPlatform()
     if (NS_FAILED(rv))
         d2dDisabled = PR_FALSE;
 
-    if (isVistaOrHigher && !d2dDisabled) {
+    nsCOMPtr<nsIXULRuntime> xr = do_GetService("@mozilla.org/xre/runtime;1");
+    PRBool safeMode = PR_FALSE;
+    if (xr)
+      xr->GetInSafeMode(&safeMode);
+
+    if (isVistaOrHigher && !d2dDisabled && !safeMode) {
         // We need a DWriteFactory to work.
         HMODULE d3d10module = LoadLibraryA("d3d10_1.dll");
         D3D10CreateDevice1Func createD3DDevice = (D3D10CreateDevice1Func)
@@ -319,7 +325,8 @@ gfxWindowsPlatform::gfxWindowsPlatform()
 #endif
 
     PRInt32 rmode;
-    if (NS_SUCCEEDED(pref->GetIntPref("mozilla.widget.render-mode", &rmode))) {
+    if (!safeMode &&
+	NS_SUCCEEDED(pref->GetIntPref("mozilla.widget.render-mode", &rmode))) {
         if (rmode >= 0 && rmode < RENDER_MODE_MAX) {
 #ifdef CAIRO_HAS_DWRITE_FONT
 	    if (rmode != RENDER_DIRECT2D && !useDirectWrite) {
diff --git a/widget/src/windows/nsWindow.cpp b/widget/src/windows/nsWindow.cpp
index 7dda03ea4f7b..32864f24541f 100644
--- a/widget/src/windows/nsWindow.cpp
+++ b/widget/src/windows/nsWindow.cpp
@@ -226,6 +226,8 @@
 #include "nsICrashReporter.h"
 #endif
 
+#include "nsIXULRuntime.h"
+
 using namespace mozilla::widget;
 
 /**************************************************************
@@ -3231,7 +3233,12 @@ nsWindow::GetLayerManager()
                          &preferOpenGL);
     }
 
-    if (disableAcceleration)
+    nsCOMPtr<nsIXULRuntime> xr = do_GetService("@mozilla.org/xre/runtime;1");
+    PRBool safeMode = PR_FALSE;
+    if (xr)
+      xr->GetInSafeMode(&safeMode);
+
+    if (disableAcceleration || safeMode)
       mUseAcceleratedRendering = PR_FALSE;
     else if (accelerateByDefault)
       mUseAcceleratedRendering = PR_TRUE;
diff --git a/widget/src/xpwidgets/nsBaseWidget.cpp b/widget/src/xpwidgets/nsBaseWidget.cpp
index 4eb09311b79a..d78f979f9a6e 100644
--- a/widget/src/xpwidgets/nsBaseWidget.cpp
+++ b/widget/src/xpwidgets/nsBaseWidget.cpp
@@ -51,6 +51,7 @@
 #include "nsIPrefBranch2.h"
 #include "BasicLayers.h"
 #include "LayerManagerOGL.h"
+#include "nsIXULRuntime.h"
 
 #ifdef DEBUG
 #include "nsIObserver.h"
@@ -772,7 +773,12 @@ LayerManager* nsBaseWidget::GetLayerManager()
                          &disableAcceleration);
     }
 
-    if (disableAcceleration)
+    nsCOMPtr<nsIXULRuntime> xr = do_GetService("@mozilla.org/xre/runtime;1");
+    PRBool safeMode = PR_FALSE;
+    if (xr)
+      xr->GetInSafeMode(&safeMode);
+
+    if (disableAcceleration || safeMode)
       mUseAcceleratedRendering = PR_FALSE;
     else if (accelerateByDefault)
       mUseAcceleratedRendering = PR_TRUE;