Graphics.cmNotSrcErase
From RAD Studio VCL Reference
Description
TCopyMode value : combines the image on the canvas and the source bitmap by using the Boolean OR operator, and inverts the result.
cmNotSrcErase is a TCopyMode value used in the TCanvas CopyMode property.
The CopyMode property is used by the CopyRect routine when copying an image from another canvas onto the current canvas.
With cmNotSrcErase, the source and destination pixels are ORed together and the result inverted and stored in the target rectangle.