ImageWallpaper : get bitmap width before calc screen offset

Inside drawFrameLocked, updateWallpaperLocked() is called after
calculae drawing offset using mBackgroundWidth/Height. Because
mBackgroundWidth/Height is modified inside updateWallpaperLocked(),
it sould be called before Mbackgroundwidth/Height is used.

Many market launcher and some phone vendor launcher call
suggestDesiredDimenstions with argument (w,h) instead aosp's
original (w*2,h) for single page wallpaper. In that case, when
launcher orientation changed, ImageWallpaper does not properly
display wallpaper image and mostly you can see Black Edge at
left.

Change-Id: I93ebc4337b01f73d3154346943afa4afd6b1988a

Author: SangWook Han

packages/SystemUI/src/com/android/systemui/ImageWallpaper.java

@@ -282,6 +282,13 @@ void drawFrameLocked() {
                 updateWallpaperLocked();
             }
 
+            if (mBackground == null) {
+                // If we somehow got to this point after we have last flushed
+                // the wallpaper, well we really need it to draw again.  So
+                // seems like we need to reload it.  Ouch.
+                updateWallpaperLocked();
+            }
+
             SurfaceHolder sh = getSurfaceHolder();
             final Rect frame = sh.getSurfaceFrame();
             final int dw = frame.width();
@@ -303,13 +310,6 @@ void drawFrameLocked() {
             mLastXTranslation = xPixels;
             mLastYTranslation = yPixels;
 
-            if (mBackground == null) {
-                // If we somehow got to this point after we have last flushed
-                // the wallpaper, well we really need it to draw again.  So
-                // seems like we need to reload it.  Ouch.
-                updateWallpaperLocked();
-            }
-
             if (mIsHwAccelerated) {
                 if (!drawWallpaperWithOpenGL(sh, availw, availh, xPixels, yPixels)) {
                     drawWallpaperWithCanvas(sh, availw, availh, xPixels, yPixels);