fix [2793164] Spam 2x/second with TOT master in SurfaceFlinger

Make sure to not use GL_TEXTURE_EXTERNAL when it's not supported
by the GL. The error was harmless, but annoying.

Change-Id: I571a9a9b05d35da51420950a6a6e95629067efd0
diff --git a/libs/surfaceflinger/LayerBuffer.cpp b/libs/surfaceflinger/LayerBuffer.cpp
index 732a4ec..5f83636 100644
--- a/libs/surfaceflinger/LayerBuffer.cpp
+++ b/libs/surfaceflinger/LayerBuffer.cpp
@@ -315,8 +315,7 @@
 
 LayerBuffer::BufferSource::BufferSource(LayerBuffer& layer,
         const ISurface::BufferHeap& buffers)
-    : Source(layer), mStatus(NO_ERROR), mBufferSize(0),
-      mTextureManager(layer.mFlags)
+    : Source(layer), mStatus(NO_ERROR), mBufferSize(0)
 {
     if (buffers.heap == NULL) {
         // this is allowed, but in this case, it is illegal to receive
@@ -374,11 +373,11 @@
 
     if (mTexture.name != -1U) {
         // GL textures can only be destroyed from the GL thread
-        mLayer.mFlinger->mEventQueue.postMessage(
-                new MessageDestroyTexture(mLayer.mFlinger.get(), mTexture.name) );
+        getFlinger()->mEventQueue.postMessage(
+                new MessageDestroyTexture(getFlinger(), mTexture.name) );
     }
     if (mTexture.image != EGL_NO_IMAGE_KHR) {
-        EGLDisplay dpy(mLayer.mFlinger->graphicPlane(0).getEGLDisplay());
+        EGLDisplay dpy(getFlinger()->graphicPlane(0).getEGLDisplay());
         eglDestroyImageKHR(dpy, mTexture.image);
     }
 }
@@ -444,7 +443,7 @@
     const Rect transformedBounds(mLayer.getTransformedBounds());
 
 #if defined(EGL_ANDROID_image_native_buffer)
-    if (mLayer.mFlags & DisplayHardware::DIRECT_TEXTURE) {
+    if (GLExtensions::getInstance().haveDirectTexture()) {
         err = INVALID_OPERATION;
         if (ourBuffer->supportsCopybit()) {
             copybit_device_t* copybit = mLayer.mBlitEngine;
@@ -549,7 +548,7 @@
         dst.crop.r = w;
         dst.crop.b = h;
 
-        EGLDisplay dpy(mLayer.mFlinger->graphicPlane(0).getEGLDisplay());
+        EGLDisplay dpy(getFlinger()->graphicPlane(0).getEGLDisplay());
         err = mTextureManager.initEglImage(&mTexture, dpy, buffer);
     }
 
@@ -559,7 +558,7 @@
 void LayerBuffer::BufferSource::clearTempBufferImage() const
 {
     // delete the image
-    EGLDisplay dpy(mLayer.mFlinger->graphicPlane(0).getEGLDisplay());
+    EGLDisplay dpy(getFlinger()->graphicPlane(0).getEGLDisplay());
     eglDestroyImageKHR(dpy, mTexture.image);
 
     // and the associated texture (recreate a name)
@@ -576,7 +575,7 @@
     : Source(layer), mVisibilityChanged(false),
     mOverlay(0), mOverlayHandle(0), mOverlayDevice(0), mOrientation(orientation)
 {
-    overlay_control_device_t* overlay_dev = mLayer.mFlinger->getOverlayEngine();
+    overlay_control_device_t* overlay_dev = getFlinger()->getOverlayEngine();
     if (overlay_dev == NULL) {
         // overlays not supported
         return;
@@ -607,7 +606,7 @@
 
     *overlayRef = new OverlayRef(mOverlayHandle, channel,
             mWidth, mHeight, mFormat, mWidthStride, mHeightStride);
-    mLayer.mFlinger->signalEvent();
+    getFlinger()->signalEvent();
 }
 
 LayerBuffer::OverlaySource::~OverlaySource()