Fix wallpaper cropping bugs

- take into account that image decoder might not
respect inSampleSize
- check rounded values so we don't have crop rects
that lie outside a bitmap's dimensions
- correctly set initial scale on bitmaps that are
larger than the screen size

Change-Id: I42be79c68b883a6e329dcc5645d7db6cd6e3eeeb

src/com/android/launcher3/CropView.java

@@ -165,7 +165,8 @@ public class CropView extends TiledImageView implements OnScaleGestureListener {
                 final float imageWidth = imageDims[0];
                 final float imageHeight = imageDims[1];
                 mMinScale = Math.max(w / imageWidth, h / imageHeight);
-                mRenderer.scale = Math.max(mMinScale, mRenderer.scale);
+                mRenderer.scale =
+                        Math.max(mMinScale, resetScale ? Float.MIN_VALUE : mRenderer.scale);
             }
         }
     }