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font-patcher: Simplify bounding box scaling

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[why]
The code looks so compliacted while in fact it is not (so much).
Rounding sometimes and sometimes not is hard to reaon about. The
un-rounded values should in principle be better, but there is some
rounding hidden in the font that we can not really simulate, so simulate
what we can.

[how]
Always scale (even if factor is one) and round to integer the BB.

[note]
Also use 'is not None' ideom.

Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>
This commit is contained in:
Fini Jastrow 2023-01-03 11:32:38 +01:00
parent dc3b2183b4
commit 2ba5dec363
1 changed files with 3 additions and 6 deletions
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font-patcher
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@ -1072,11 +1072,7 @@ class font_patcher:
sym_dim = get_glyph_dimensions(self.sourceFont[currentSourceFontGlyph])
# Use combined bounding box?
if scale_glyph_data is not None and scale_glyph_data[1] is not None:
if scale_ratio_x != 1 or scale_ratio_y != 1:
# Simulate scaling on combined bounding box
scaleglyph_dim = scale_bounding_box(scale_glyph_data[1], scale_ratio_x, scale_ratio_y)
else:
scaleglyph_dim = scale_glyph_data[1]
scaleglyph_dim = scale_bounding_box(scale_glyph_data[1], scale_ratio_x, scale_ratio_y)
if scaleglyph_dim['advance'] is None:
# On monospaced symbol collections use their advance with, otherwise align horizontally individually
scaleglyph_dim['xmin'] = sym_dim['xmin']
@ -1341,12 +1337,13 @@ def get_glyph_dimensions(glyph):
def scale_bounding_box(bbox, scale_x, scale_y):
""" Return a scaled version of a glyph dimensions dict """
# Simulate scaling on combined bounding box, round values for better simulation
new_dim = {
'xmin' : int(bbox['xmin'] * scale_x),
'ymin' : int(bbox['ymin'] * scale_y),
'xmax' : int(bbox['xmax'] * scale_x),
'ymax' : int(bbox['ymax'] * scale_y),
'advance': int(bbox['advance'] * scale_x) if bbox['advance'] else None,
'advance': int(bbox['advance'] * scale_x) if bbox['advance'] is not None else None,
}
new_dim['width'] = new_dim['xmax'] + (-new_dim['xmin'])
new_dim['height'] = new_dim['ymax'] + (-new_dim['ymin'])