X-Git-Url: http://git.osdn.net/view?a=blobdiff_plain;f=services%2Fsurfaceflinger%2FDisplayDevice.cpp;h=0e3c7c650212d418371524fc42ec304bb4c0957e;hb=f460f55c84b0a75de749b8a784059f5ff423ed93;hp=c67f4d8f83d72629bc29c7ea54d315009a64f646;hpb=687821c05b5a85db1b172e7599861c803d268a8d;p=android-x86%2Fframeworks-native.git

diff --git a/services/surfaceflinger/DisplayDevice.cpp b/services/surfaceflinger/DisplayDevice.cpp
index c67f4d8f83..0e3c7c6502 100644
--- a/services/surfaceflinger/DisplayDevice.cpp
+++ b/services/surfaceflinger/DisplayDevice.cpp
@@ -63,7 +63,6 @@ DisplayDevice::DisplayDevice(
       mDisplaySurface(displaySurface),
       mDisplay(EGL_NO_DISPLAY),
       mSurface(EGL_NO_SURFACE),
-      mContext(EGL_NO_CONTEXT),
       mDisplayWidth(), mDisplayHeight(), mFormat(),
       mFlags(),
       mPageFlipCount(),
@@ -79,6 +78,16 @@ DisplayDevice::DisplayDevice(
     int format;
     window->query(window, NATIVE_WINDOW_FORMAT, &format);
 
+    // Make sure that composition can never be stalled by a virtual display
+    // consumer that isn't processing buffers fast enough. We have to do this
+    // in two places:
+    // * Here, in case the display is composed entirely by HWC.
+    // * In makeCurrent(), using eglSwapInterval. Some EGL drivers set the
+    //   window's swap interval in eglMakeCurrent, so they'll override the
+    //   interval we set here.
+    if (mType >= DisplayDevice::DISPLAY_VIRTUAL)
+        window->setSwapInterval(window, 0);
+
     /*
      * Create our display's surface
      */
@@ -253,6 +262,8 @@ EGLBoolean DisplayDevice::makeCurrent(EGLDisplay dpy, EGLContext ctx) const {
     if (sur != mSurface) {
         result = eglMakeCurrent(dpy, mSurface, mSurface, ctx);
         if (result == EGL_TRUE) {
+            if (mType >= DisplayDevice::DISPLAY_VIRTUAL)
+                eglSwapInterval(dpy, 0);
             setViewportAndProjection();
         }
     }