fix Surface positions are not floats

Added Surface.setPosition(float, float) which allows to set a surface's
position in float.

Bug: 5239859
Change-Id: I903aef4ad5b5999142202fb8ea30fe216d805711
diff --git a/services/surfaceflinger/LayerBase.cpp b/services/surfaceflinger/LayerBase.cpp
index 4cc245a..c56836e 100644
--- a/services/surfaceflinger/LayerBase.cpp
+++ b/services/surfaceflinger/LayerBase.cpp
@@ -45,7 +45,6 @@
       mFlinger(flinger), mFiltering(false),
       mNeedsFiltering(false),
       mOrientation(0),
-      mLeft(0), mTop(0),
       mTransactionFlags(0),
       mPremultipliedAlpha(true), mName("unnamed"), mDebug(false),
       mInvalidate(0)
@@ -119,7 +118,7 @@
     return android_atomic_or(flags, &mTransactionFlags);
 }
 
-bool LayerBase::setPosition(int32_t x, int32_t y) {
+bool LayerBase::setPosition(float x, float y) {
     if (mCurrentState.transform.tx() == x && mCurrentState.transform.ty() == y)
         return false;
     mCurrentState.sequence++;
@@ -259,8 +258,6 @@
     mOrientation = tr.getOrientation();
     mTransform = tr;
     mTransformedBounds = tr.makeBounds(w, h);
-    mLeft = tr.tx();
-    mTop  = tr.ty();
 }
 
 void LayerBase::lockPageFlip(bool& recomputeVisibleRegions)
@@ -476,10 +473,10 @@
     snprintf(buffer, SIZE,
             "+ %s %p\n"
             "      "
-            "z=%9d, pos=(%4d,%4d), size=(%4d,%4d), "
+            "z=%9d, pos=(%g,%g), size=(%4d,%4d), "
             "isOpaque=%1d, needsDithering=%1d, invalidate=%1d, "
             "alpha=0x%02x, flags=0x%08x, tr=[%.2f, %.2f][%.2f, %.2f]\n",
-            getTypeId(), this, s.z, tx(), ty(), s.w, s.h,
+            getTypeId(), this, s.z, s.transform.tx(), s.transform.ty(), s.w, s.h,
             isOpaque(), needsDithering(), contentDirty,
             s.alpha, s.flags,
             s.transform[0][0], s.transform[0][1],