 regular sprites, which cut off the image cleanly at these boundaries.  The <code>CompoundSprite</code> is a virtual effect which can’t slice a sprite in half.  Therefore, the entire sprite is rendered if even a portion is visible in the viewable rect.</p>
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<p>The <code>CompoundSprite</code>‘s <code>source_x</code>, <code>source_y</code>, <code>source_w</code>, <code>source_h</code> act like these attributes would if displaying a normal image instead of a collection of sprites.  They are relati