give the proper orientation to the h/w composer HAL

we were using the "orientation" value instead of the
real transform, which may contain arbitrary rotations for
instance, and in some case ended up with a final "orientation"
that looked valid, but wasn't.

this fixes a problem on devices with a h/w composer hal where
the rotation animation looked weird.

Change-Id: I4be8a2a1bde49c33456fcf5c8d87ab515c216763

services/surfaceflinger/Layer.cpp

@@ -196,13 +196,12 @@ void Layer::setGeometry(hwc_layer_t* hwcl)
      * 1) buffer orientation/flip/mirror
      * 2) state transformation (window manager)
      * 3) layer orientation (screen orientation)
-     * mOrientation is already the composition of (2) and (3)
+     * mTransform is already the composition of (2) and (3)
      * (NOTE: the matrices are multiplied in reverse order)
      */
 
     const Transform bufferOrientation(mCurrentTransform);
-    const Transform layerOrientation(mOrientation);
-    const Transform tr(layerOrientation * bufferOrientation);
+    const Transform tr(mTransform * bufferOrientation);
 
     // this gives us only the "orientation" component of the transform
     const uint32_t finalTransform = tr.getOrientation();

services/surfaceflinger/LayerBase.cpp

@@ -257,6 +257,7 @@ void LayerBase::validateVisibility(const Transform& planeTransform)
 
     // cache a few things...
     mOrientation = tr.getOrientation();
+    mTransform = tr;
     mTransformedBounds = tr.makeBounds(w, h);
     mLeft = tr.tx();
     mTop  = tr.ty();

services/surfaceflinger/LayerBase.h

@@ -247,6 +247,7 @@ private:
 protected:
                 // cached during validateVisibility()
                 int32_t         mOrientation;
+                Transform       mTransform;
                 GLfloat         mVertices[4][2];
                 Rect            mTransformedBounds;
                 int             mLeft;