check on input image to be rotated to best fit the current view orientation

[moovida]

Checks for the ratio of the loaded image (being it by load or by intent) against the current screen ratio. If necessary, it rotates the bitmap in order to best fit the drawing canvas.

[dsandler]

Hey, I took a look at this patch, and it would be more efficient to add a paintBitmap(Bitmap, Matrix) method so that we can just rotate it when drawing it for the first time. This way we don't have to duplicate the bitmap when loading it, which can use a ton of memory.