Value 

Meaning 

cmBlackness  

Fills the destination rectangle on the canvas with black.  

cmDstInvert  

Inverts the image on the canvas and ignores the source.  

cmMergeCopy  

Combines the image on the canvas and the source bitmap by using the Boolean AND operator.  

cmMergePaint  

Combines the inverted source bitmap with the image on the canvas by using the Boolean OR operator.  

cmNotSrcCopy  

Copies the inverted source bitmap to the canvas.  

cmNotSrcErase  

Combines the image on the canvas and the source bitmap by using the Boolean OR operator, and inverts the result.  

cmPatCopy  

Copies the source pattern to the canvas.  

cmPatInvert  

Combines the source pattern with the image on the canvas using the Boolean XOR operator  

cmPatPaint  

Combines the inverted source bitmap with the source pattern by using the Boolean OR operator. Combines the result of this operation with the image on the canvas by using the Boolean OR operator.  

cmSrcAnd  

Combines the image on the canvas and source bitmap by using the Boolean AND operator.  

cmSrcCopy  

Copies the source bitmap to the canvas.  

cmSrcErase  

Inverts the image on the canvas and combines the result with the source bitmap by using the Boolean AND operator.  

cmSrcInvert  

Combines the image on the canvas and the source bitmap by using the Boolean XOR operator.  

cmSrcPaint  

Combines the image on the canvas and the source bitmap by using the Boolean OR operator.  

cmWhiteness  

Fills the destination rectangle on the canvas with white.