Significance of the copymode parameter in the Delphi-TCanvas. copyrect Method

Technical Exchange.

First, check the possible values:

 
Cmblackness = blackness; effecstinvert = regular; cmergecopy = mergecopy; cmergepaint = mergepaint; Sequence = notsrccopy; Sequence = NOTSRCERASE; Sequence = patcopy; Sequence = sequence; cmpatpaint = patpaint; Sequence = srcand; cmsrccopy = srccopy; cmsrcerase = srcerase; cmsrcinvert = SRCINVERT; cmsrcpaint = srcpaint; cmwhiteness = whiteness;
 

See the results. Come on.CodeTry:

Procedure construct (Sender: tobject); var RC1, RC2: trect; begin RC1: = rect (, img1.width, img1.height); RC2: = rect (, img2.width, img2.height ); with img2.canvas do begin copymode: = cmblackness; // modify the copyrect (RC1, img1.canvas, RC2); end;
 

To get a table:
Source image

Copymode	Effect
Blackness	Fill the area of the target rectangle with black.
Whiteness	Fill the target rectangular area with white
Dstinvert	Invert the target rectangular Image
Mergecopy	Boolean and "operations on the source rectangular image and the specified pattern
Mergepaint	After the source rectangular image is reversed, a Boolean OR "operation is performed on the target rectangular image.
Notsrccopy	After the source rectangular image is reversed, it is copied to the target rectangle.
NOTSRCERASE	Perform Boolean OR "operations on the source and target rectangular images, and then reverse the obtained images.
Patcopy	Copy the specified pattern brush to the target rectangle.
Patinvert	Returns the Boolean "XOR" operation between the specified pattern brush and the target rectangular image.
Patpaint	First, the source rectangular image is reversed, and a Boolean OR "operation is performed with the specified pattern brush, perform Boolean OR "srcand" operations on the source and target rectangular images "and" operations on the target rectangular images
Srccopy	Copy the source rectangle image directly to the target rectangle.
Srcerase	Invert the target rectangular image, and then perform Boolean and "operations on the source rectangular Image
SRCINVERT	Boolean "XOR" Operation on the source and target rectangular images
Srcpaint	Boolean OR "Operation on the source and target rectangular images

Good. Bye