Control Value Table

From DejaVu

The Control Value Table is a list of dimensions of common features in a font. By using CVT entries instead of ad-hoc dimensions in instructions, glyphs can be made to look consistent at all pixel sizes.

Contents 1 X dimensions 1.1 Offsets 1.2 Weights 1.3 X components 1.4 Serif dimensions 2 Y dimensions 2.1 Offsets 2.2 Weights 2.3 Heights 2.4 Y components 2.5 Serif dimensions 3 Diagonal dimensions 3.1 Weights

X dimensions

By convention these go at the beginning, with the freedom and projection vectors set to the X-axis.

Offsets

	Sans	Sans Bold	Sans Oblique	Sans BO	Serif	Serif Bold
Straight capitals	4	3	27	25	33
Curved capitals	16	43	13	13		13
Straight lowercase letters	70	16	36	13	48
Curved lowercase letters	69	59	34	13	42	50

Weights

	Sans	Sans Bold	Sans Oblique	Sans BO	Mono	Mono Bold	Mono Oblique	Mono BO	Serif	Serif Bold
Stems in capitals	28	22 or 49	n/a	n/a	30				17
Curves in capitals	25	45	28	27	50					37
Stems in lowercase	8	13	n/a	n/a	6				39
Curves in lowercase	18	66	14	33	18				26	62

X components

	Sans Oblique	Sans BO	Mono Oblique	Mono BO
Straight capitals	2	2
Tall lowercase letters	37	32
Short lowercase letters	42	38
Lowercase legs	39	37

Serif dimensions

	Serif	Serif Bold
Lowercase vertical serif	45	51
Capitals vertical serif	15	18
Lowercase horizontal serif	44
Captital horizontal serif	36

Y dimensions

These come later, after a SVTCA[y-axis] instruction.

Offsets

	Sans	Sans Bold	Sans Oblique	Sans BO	Mono	Mono Bold	Mono Oblique	Mono BO	Serif	Serif Bold
Amount curves dip below baseline	140	152	81	96	153				96	112
Amount descenders dip below baseline	189	218 or 222	127	158	195				130

Weights

	Sans	Sans Bold	Sans Oblique	Sans BO	Mono	Mono Bold	Mono Oblique	Mono BO	Serif	Serif Bold
Horizontals in capitals	149	192	90	135	151
Curves in capitals	149	174	90	117	151					126
Curves in b,c,d...	185	161	76	105	140				148	137
Curves in h,m,n...	135	219	76	159	140				133
Stems in lowercase	169	216			182				122

Heights

	Sans	Sans Bold	Sans Oblique	Sans BO	Mono	Mono Bold	Mono Oblique	Mono BO	Serif	Serif Bold
Straight capitals	129	141	70	83	136
Curved capitals	145	156	86	100	150					123
Tall lowercase letters	151	163	92	107	155				113
Short lowercase letters	188	179	126	122	194
Round lowercase letters	184	202	122	143	190				105	158
Bottom half of capitals	173	use top	115	use top	177
Top half of capitals	use bottom	190	use bottom	133	use bottom

Y components

	Sans	Sans Bold	Sans Oblique	Sans BO	Mono	Mono Bold	Mono Oblique	Mono BO	Serif	Serif Bold
Curve depth in capitals	174	MDRP	116	MDRP	178					MDRP
Beveled edge length in capitals	161	MDRP	101	MDRP	179
Curve depth in lowercase	136	208 or 212	78	152	192
Beveled edge length in lowercase	134	204	75	145	139

Serif dimensions

	Serif	Serif Bold
Lowercase vertical serif
Capitals vertical serif	129 or MDRP	43 from inside of curve
Lowercase horizontal serif
Captital horizontal serif		40/45(disappears @9 PPEM)

Diagonal dimensions

These come last, after SPVTL[orthog] instructions to measure across the diagonal stroke.

Weights

	Sans	Sans Bold	Sans Oblique	Sans BO	Mono	Mono Bold	Mono Oblique	Mono BO	Serif	Serif Bold
Diagonals in capitals	17	29	5	15	37				100(thin)/16(thik)	30(thin)/31(thick)
Diagonals in lowercase	17	29	43	4	23