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[justify-demo] Create new fonts all the time 

The hb.shape_justify() call modifies the font. This was messing
up justification. Create new fonts all the time.
This commit is contained in:
Behdad Esfahbod 2023-03-04 21:09:26 -07:00
parent 690145fa00
commit d165afec1d
1 changed files with 10 additions and 8 deletions
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18
src/justify.py
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@ -114,7 +114,8 @@ def makebuffer(words):
return buf return buf
def justify(font, words, advance, target_advance): def justify(face, words, advance, target_advance):
font = hb.font_create(face)
buf = makebuffer(words) buf = makebuffer(words)
wiggle = 5 wiggle = 5
@ -149,7 +150,8 @@ def justify(font, words, advance, target_advance):
return True, buf, variation return True, buf, variation
def shape(font, words): def shape(face, words):
font = hb.font_create(face)
buf = makebuffer(words) buf = makebuffer(words)
hb.shape(font, buf) hb.shape(font, buf)
positions = hb.buffer_get_glyph_positions(buf) positions = hb.buffer_get_glyph_positions(buf)
@ -157,15 +159,15 @@ def shape(font, words):
return buf, advance return buf, advance
def typeset(font, text, target_advance): def typeset(face, text, target_advance):
lines = [] lines = []
words = [] words = []
for word in text.split(): for word in text.split():
words.append(word) words.append(word)
buf, advance = shape(font, words) buf, advance = shape(face, words)
if advance > target_advance: if advance > target_advance:
# Shrink # Shrink
ret, buf, variation = justify(font, words, advance, target_advance) ret, buf, variation = justify(face, words, advance, target_advance)
if ret: if ret:
lines.append((buf, variation)) lines.append((buf, variation))
words = [] words = []
@ -173,7 +175,7 @@ def typeset(font, text, target_advance):
# A too short line is better than too long. # A too short line is better than too long.
elif len(words) > 1: elif len(words) > 1:
words.pop() words.pop()
_, buf, variation = justify(font, words, advance, target_advance) _, buf, variation = justify(face, words, advance, target_advance)
lines.append((buf, variation)) lines.append((buf, variation))
words = [word] words = [word]
# But if it is one word, meh. # But if it is one word, meh.
@ -183,7 +185,7 @@ def typeset(font, text, target_advance):
# Justify last line # Justify last line
if words: if words:
_, buf, variation = justify(font, words, advance, target_advance) _, buf, variation = justify(face, words, advance, target_advance)
lines.append((buf, variation)) lines.append((buf, variation))
return lines return lines
@ -196,7 +198,7 @@ def render(face, text, context, width, height, fontsize):
scale = fontsize / hb.face_get_upem(face) scale = fontsize / hb.face_get_upem(face)
target_advance = (width - (margin * 2)) / scale target_advance = (width - (margin * 2)) / scale
lines = typeset(font, text, target_advance) lines = typeset(face, text, target_advance)
_, extents = hb.font_get_h_extents(font) _, extents = hb.font_get_h_extents(font)
lineheight = extents.ascender - extents.descender + extents.line_gap lineheight = extents.ascender - extents.descender + extents.line_gap