11.6.3.1 BZR character beginnings

BZR format provides two ways to start characters: an abbreviated one, which saves space in common cases, and a longer form which (we hope) will always suffice.

The short form looks like this:

BOC_ABBREV @cmindex BOC_ABBREV charcode[1] set-width[2] llx[2] lly[2] urx[2] ury[2]

The long form:

BOC @cmindex BOC charcode[1] set-width[3] llx[3] lly[3] urx[3] ury[3]

Here is a description of these components:

• The BOC or BOC_ABBREV opcode byte introduces the character.

• charcode defines the character code in question.

• set-width defines the set width of the character, given as a design-size scaled, in printer's points.

• llx ... ury (which stand for "lower left x", "lower left y", "upper right x", and "upper right y") define the bounding box for this character. The values are designsize-scaled, in printer's points. The bounding box is not guaranteed to be the tightest possible, because it is difficult to compute the exact path of any splines in the character shape (see section 11.6.3.2 BZR character shapes).

As with other formats, the left side bearing is defined by llx, and the right side bearing by set-width - urx.

See section 11.6.1 BZR format introduction, for general information about BZR files and for the definition of the types used here.