Sack Library Documentation
sack::PSI::CopyOriginalSurface Function
Image CopyOriginalSurface(PSI_CONTROL pc, Image prior_image);

result with an image pointer, will sue the image passed as prior_image to copy into (resizing if nessecary), if prior_image is NULL then a new Image will be returned. If the surface has not been marked as parent_cleaned, then NULL results, as no Original image is available. The image passed as a destination for the surface copy is not released, it is resized, and copied into. THe result may still be NULL the image will still be the last valid copy of the surface.

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