SetWriteMask

Set the pixel write mask value for a RastPort

Declaration

Source position: agraphics.pas line 2210

function SetWriteMask(

Rp: PRastPort;

Mask: LongWord

):LongWord;

Arguments

`Rp`		A pointer to a RastPort
`Mask`		A longword mask value.

Function result

Graphics devices which do not support per-bit masking will return 0 (failure).

Description

Set the current value of the bit write mask for the rastport. bits of the pixel with zeros in their mask will not be modified by subsequent drawing operations.