The dfCharTable member for Windows 2.x has a GlyphEntry structure with the following format:
GlyphEntry struc
geWidth dw ? ; width of char bitmap, pixels
geOffset dw ? ; pointer to the bits
GlyphEntry ends
The dfCharTable member in Windows 3.0 and later is dependent on the format of the glyph bitmap. The only formats supported are DFF_FIXED and DFF_PROPORTIONAL.
DFF_FIXED
DFF_PROPORTIONAL
GlyphEntry struc
geWidth dw ? ; width of char bitmap, pixels
geOffset dd ? ; pointer to the bits
GlyphEntry ends
DFF_ABCFIXED
DFF_ABCPROPORTIONAL
GlyphEntry struc
geWidth dw ? ; width of char bitmap, pixels
geOffset dd ? ; pointer to the bits
geAspace dd ? ; A space, fract pixels (16.16)
geBspace dd ? ; B space, fract pixels (16.16)
geCspace dw ? ; C space, fract pixels (16.16)
GlyphEntry ends
Fractional pixels are expressed as 32-bit signed numbers with an implicit binary point between bits 15 and 16. This is referred to as a 16.16 (“sixteen dot sixteen”) fixed-point number.
The ABC spacing in the following example is the same as defined previously. However, specific sets are defined for each character:
DFF_1COLOR ; 8 pixels per byte
DFF_16COLOR ; 2 pixels per byte
DFF_256COLOR ; 1 pixel per byte
DFF_RGBCOLOR ; RGB quads
GlyphEntry struc
geWidth dw ? ; width of char bitmap, pixels
geOffset dd ? ; pointer to the bits
geHeight dw ? ; height of char bitmap, pixels
geAspace dd ? ; A space, fract pixels (16.16)
geBspace dd ? ; B space, fract pixels (16.16)
geCspace dd ? ; C space, fract pixels (16.16)
GlyphEntry ends