SCI/Specifications/Graphics/Font resource

The SCI font resource

SCI font resources remained unchanged during the SCI revisions and were still used in SCI32. Their format is relatively straightforward and completely sufficient for any 8 or even 16 bit character table:

Offset	Type	Meaning
0	16bit integer, little endian encoding	Always zero (?)
2	16bit integer, little endian encoding	NUMCHAR: Number of characters
4	16bit integer, little endian encoding	HEIGHT: Number of pixel lines per text line
6+NR*2	16bit integer, little endian encoding	Absolute offset of the character #NR, where 0 <= NR < NUMCHAR

HEIGHT does not affect the height of a character, though- it only tells the interpreter how far to move downwards when displaying a line of text. The characters referenced to starting at offset 6 are encoded as follows:

Offset	Type	Meaning
0	unsigned 8 bit integer	character HEIGHT
1	unsigned 8 bit integer	character WIDTH
2...	bitmask, size HEIGHT * round up(WIDTH / 8)	Bitmask for the character

The bitmap consists of HEIGHT lines of n bytes, where n equals the number of bytes required for storing WIDTH bits. Data is stored with the MSB first, in little-endian encoding (first byte describes the 8 leftmost pixels), where a pixel is drawn if the bit it corresponds to is set.