TextMode
short newMode ; transfer mode, e.g., srcCopy, srcOr, etc.
TextMode selects the bit-transfer mode to be used in subsequent text- drawing. Used for writing white characters on a black background, etc.
newMode selects the transfer mode. It must be one of the srcXxx" modes.
Use one of the following constants, as defined in Quickdraw.h:
srcCopy 0 overwrite background entirely
srcOr 1 overwrite where character is black
srcXor 2 invert where character is black
srcBic 3 force white where character is black
notSrcCopy 4 invert character, then srcCopy
notSrcOr 5 invert character, then srcOr
notSrcXor 6 invert character, then srcXor
notSrcBic 7 invert character, then srcBic
various modes.
The default mode is srcOr, which causes characters to be drawn over the
background, while allowing the background pattern to show through in the
empty parts of each letter.
The original Mac toolbox supported only srcOr, srcXor, and srcBic.