Unit 'agraphics'	Package
[Overview][Constants][Types][Procedures and functions][Variables][Index]	[#os4units]

SetWriteMask

Set the pixel write mask value for a RastPort

Declaration

Source position: agraphics.pas line 2462

function SetWriteMask(

Rp: PRastPort;

Msk: LongWord

):LongWord;

Arguments

Rp

A pointer to a RastPort

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.