Source

From TrillWiki

Source code is used to locate and position a BitMap in a <background> tag.

<source name="bitmap name" left="" right="" top="" bottom=""/>

Attribute	Priority	Description, Possible Values
name	Required	Which BitMap will be used
left	Required	defines the left side of the area to be used in the BitMap
right	Required	defines the right side of the area to be used in the BitMap
top	Required	defines the top of the area to be used in the BitMap
bottom	Required	defines the bottom of the area to be used in the BitMap

Use a rect tag to define how the source will be placed.