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-rw-r--r--gfx/thebes/gfxPlatform.cpp10
-rw-r--r--gfx/thebes/gfxPrefs.h1
2 files changed, 6 insertions, 5 deletions
diff --git a/gfx/thebes/gfxPlatform.cpp b/gfx/thebes/gfxPlatform.cpp
index d5af16a19..65227a8a7 100644
--- a/gfx/thebes/gfxPlatform.cpp
+++ b/gfx/thebes/gfxPlatform.cpp
@@ -2380,13 +2380,13 @@ gfxPlatform::AsyncPanZoomEnabled()
{
#if !defined(MOZ_WIDGET_ANDROID) && !defined(MOZ_WIDGET_UIKIT)
// For XUL applications (everything but Firefox on Android) we only want
- // to use APZ when E10S is enabled. If we ever get input events off the
- // main thread we can consider relaxing this requirement.
- if (!BrowserTabsRemoteAutostart()) {
+ // to use APZ when E10S is enabled or when the user explicitly enable it.
+ if (BrowserTabsRemoteAutostart() || gfxPrefs::APZDesktopEnabled()) {
+ return gfxPrefs::AsyncPanZoomEnabledDoNotUseDirectly();
+ } else {
return false;
}
-#endif
-#ifdef MOZ_WIDGET_ANDROID
+#elif defined(MOZ_WIDGET_ANDROID)
return true;
#else
return gfxPrefs::AsyncPanZoomEnabledDoNotUseDirectly();
diff --git a/gfx/thebes/gfxPrefs.h b/gfx/thebes/gfxPrefs.h
index 359a258c7..1253fdb48 100644
--- a/gfx/thebes/gfxPrefs.h
+++ b/gfx/thebes/gfxPrefs.h
@@ -310,6 +310,7 @@ private:
DECL_GFX_PREF(Live, "apz.y_stationary_size_multiplier", APZYStationarySizeMultiplier, float, 3.5f);
DECL_GFX_PREF(Live, "apz.zoom_animation_duration_ms", APZZoomAnimationDuration, int32_t, 250);
DECL_GFX_PREF(Live, "apz.scale_repaint_delay_ms", APZScaleRepaintDelay, int32_t, 500);
+ DECL_GFX_PREF(Once, "apz.desktop.enabled", APZDesktopEnabled, bool, false);
DECL_GFX_PREF(Live, "browser.ui.zoom.force-user-scalable", ForceUserScalable, bool, false);
DECL_GFX_PREF(Live, "browser.viewport.desktopWidth", DesktopViewportWidth, int32_t, 980);