defrasterfont(3G) defrasterfont(3G)
defrasterfont - defines a raster font
void defrasterfont(short n, short ht, short nc,
Fontchar chars[], short nr, unsigned short raster[])
n expects the constant that you want to use as the identifier for
this raster font. This constant is used as an index into a font
table. The default font, 0, is a fixed-pitch font with a height
of 15 and width of 9. Font 0 cannot be redefined.
ht expects the maximum height (in pixels) for a character.
nc expects the number of characters in this font.
chars expects an array of character description structures of type
Fontchar. The Fontchar structure is defined in <gl/gl.h> as:
typedef struct {
unsigned short offset;
Byte w, h;
signed char xoff, yoff;
short width;
} Fontchar;
offset expects the element number of raster at which the bitmap
for this character starts. The element numbers start at zero.
w expects the number of columns in the bitmap that contain set
bits (character width).
h expects the number of rows in the bitmap of the character
(including ascender and descender).
xoff expects bitmap columns between the start of the character's
bitmap and the start of the character.
yoff expects the number rows between the character's baseline
and the bottom of the bitmap. For characters with descenders
(e.g., g) this value is a negative number. For characters that
rest entirely on the baseline, this value is zero.
width expects the pixel width for the character. This value
tells the system how far to space after drawing the character.
(This value is added to the character position.)
nr expects the number of 16-bit integers in raster.
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defrasterfont(3G) defrasterfont(3G)
raster expects a one-dimensional array that contains all the bit maps
(masks) for the characters in the font. Each element of the
array is a 16-bit integer and the elements are ordered left to
right, bottom to top. When interpreting each element, the bits
are left justified within the character's bounding box.
The maximum row width for a single bitmap is not limited to the
capacity of a single 16-bit integer array element. The rows of
a bitmap may span more than one array element. However, each
new row in the character bitmap must start with its own array
element. Likewise, each new character bitmap must start with
its own array element. The system reads the row width and
starting location for a character bitmap from the structures in
the chars array.
defrasterfont defines a raster font. To replace a raster font, specify
the index of the previous font as the index for the new font. To delete
a raster font, define a font with no characters. Patterns, cursors, and
fonts are available to all windows when using multiple windows.
charstr, cmov, font, getcpos, getdescender, getfont, getheight, strwidth
This routine is available only in immediate mode.
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