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Ell authored
Maintain the bounding box of drawables (i.e., the bounds of their actual rendered content) separately from their logical boundary (as shown in the UI). The bounding box is calculated through the new GimpDrawable::get_bounding_box() virtual function, which has a corresponding gimp_drawable_get_bounding_box() function; the default implementation simply returns the drawable's logical boundary. The bounding box is specified in drawable coordinates, i.e., it's not affected by the drawable's offset. The bounding box is recalculated through gimp_drawable_update_bounding_box(), which should be called whenever a change may affect the bounding box (for example, when setting a new buffer, as done implicitly by GimpDrawable's ::set_buffer() implementation, or when a drawable filter's properties change, as will be done by GimpDrawableFilter in a following commit). When the bounding box changes, the affected regions of the drawable are updated...
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