Source Serif scale values

scale_to_caption.py

f = CurrentFont()
x_height_scale = 1.05
ascender_scale = 0.98
descender_scale = 0.88

hor_scale_factor_lc = 1.12
hor_scale_factor_uc = 1.1
lime = (0.502, 1.0, 0.0, 1.0)

f.info.xHeight = int(round(x_height_scale * f.info.xHeight))
f.info.ascender = int(round(ascender_scale * f.info.ascender))
f.info.descender = int(round(descender_scale * f.info.descender))

for g_name in 'abcdefghijklmnopqrstuvwxyz':
    g = f[g_name]
    g.scaleBy((hor_scale_factor_lc, x_height_scale), origin=(0, 0))
    g.width = int(round(g.width * hor_scale_factor_lc))
    g.mark = lime

for g_name in 'ABCDEFGHIJKLMNOPQRSTUVWXYZ':
    g = f[g_name]
    g.scaleBy((hor_scale_factor_uc, 1), origin=(0, 0))
    g.width = int(round(g.width * hor_scale_factor_uc))
    g.mark = lime

scale_to_display.py

f = CurrentFont()
x_height_scale = .95
ascender_scale = 1.01
descender_scale = 1.08

hor_scale_factor_lc = .91
hor_scale_factor_uc = .94
lime = (0.502, 1.0, 0.0, 1.0)

f.info.xHeight = int(round(x_height_scale * f.info.xHeight))
f.info.ascender = int(round(ascender_scale * f.info.ascender))
f.info.descender = int(round(descender_scale * f.info.descender))

for g_name in 'abcdefghijklmnopqrstuvwxyz':
    g = f[g_name]
    g.scaleBy((hor_scale_factor_lc, x_height_scale), origin=(0, 0))
    g.width = int(round(g.width * hor_scale_factor_lc))
    g.mark = lime
    
for g_name in 'ABCDEFGHIJKLMNOPQRSTUVWXYZ':
    g = f[g_name]
    g.scaleBy((hor_scale_factor_uc, 1), origin=(0, 0))
    g.width = int(round(g.width * hor_scale_factor_uc))
    g.mark = lime