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Fix: Correct binary header generation in fontconvert.py

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Antigravity Agent 2026-01-20 00:00:14 -05:00
parent 532f8ea07a
commit ad6dfd59ab
1 changed files with 48 additions and 32 deletions
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80
lib/EpdFont/scripts/fontconvert.py
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@ -211,44 +211,60 @@ for index, glyph in enumerate(all_glyphs):
if isBinary:
import struct
with open(f"{font_name}.epdfont", "wb") as f:
# Magic
# Custom Header Format (48 bytes total)
# 0 : Magic (4) "EPDF"
# 4 : IntervalCount (4)
# 8 : FileSize (4) - Calculated later
# 12: Height (4)
# 16: GlyphCount (4)
# 20: Ascender (4)
# 24: Reserved (4) - (Previously descender or padding?)
# 28: Descender (4)
# 32: Is2Bit (4)
# 36: OffsetIntervals (4)
# 40: OffsetGlyphs (4)
# 44: OffsetBitmaps (4)
header_size = 48
intervals_size = len(intervals) * 12 # 3 * 4 bytes
glyphs_size = len(glyph_props) * 13 # 13 bytes per glyph
bitmaps_size = len(bytes(glyph_data))
offset_intervals = header_size
offset_glyphs = offset_intervals + intervals_size
offset_bitmaps = offset_glyphs + glyphs_size
file_size = offset_bitmaps + bitmaps_size
# Pack header
f.write(b"EPDF")
# Metrics (22 bytes)
# intervalCount (uint32_t), advanceY (uint8_t), ascender (int32_t), descender (int32_t), is2Bit (uint8_t), totalGlyphCount (uint32_t)
f.write(struct.pack("<IBiiBI", len(intervals), norm_ceil(face.size.height), norm_ceil(face.size.ascender), norm_floor(face.size.descender), 1 if is2Bit else 0, len(glyph_props)))
f.write(struct.pack("<I", len(intervals))) # 4
f.write(struct.pack("<I", file_size)) # 8
f.write(struct.pack("<I", norm_ceil(face.size.height))) # 12
f.write(struct.pack("<I", len(glyph_props))) # 16
f.write(struct.pack("<i", norm_ceil(face.size.ascender))) # 20
f.write(struct.pack("<i", 0)) # 24 (Reserved/Unknown in C++)
f.write(struct.pack("<i", norm_floor(face.size.descender))) # 28
f.write(struct.pack("<I", 1 if is2Bit else 0)) # 32 (Is2Bit, using 4 bytes to align)
f.write(struct.pack("<I", offset_intervals)) # 36
f.write(struct.pack("<I", offset_glyphs)) # 40
f.write(struct.pack("<I", offset_bitmaps)) # 44
# Intervals
offset = 0
current_offset = 0 # Offset relative to start of bitmaps
for i_start, i_end in intervals:
f.write(struct.pack("<III", i_start, i_end, offset))
offset += i_end - i_start + 1
f.write(struct.pack("<III", i_start, i_end, current_offset))
# Calculate offset increment based on number of glyphs in this interval
# This logic mimics the C++ loop: offset += i_end - i_start + 1
# Note: The 'offset' field in intervals points to the INDEX in the Glyph table, not byte offset.
current_offset += i_end - i_start + 1
# Glyphs
for g in glyph_props:
# dataOffset (uint32_t), dataLength (uint16_t), width (uint8_t), height (uint8_t), advanceX (uint8_t), left (int8_t), top (int8_t)
# wait, GlyphProps has width, height, advance_x, left, top, data_length, data_offset, code_point
# We need: dataOffset (4), dataLength (2), width (1), height (1), advanceX (1), left (1), top (1) = 11 bytes?
# Let's use 13 bytes as planned to be safer or just 11.
# Original EpdGlyph:
# uint32_t dataOffset;
# uint16_t dataLength;
# uint8_t width;
# uint8_t height;
# uint8_t advanceX;
# int8_t left;
# int8_t top;
# Total: 4+2+1+1+1+1+1 = 11 bytes.
# I will use 13 bytes to align better if needed, but 11 is fine.
# Let's use 13 bytes as per plan: 4+2+1+1+1+1+1 + 2 padding.
# CustomEpdFont.cpp expects:
# glyphBuf[0] = w
# glyphBuf[1] = h
# glyphBuf[2] = adv
# glyphBuf[3] = l (signed)
# glyphBuf[4] = unused
# glyphBuf[5] = t (signed)
# glyphBuf[6] = unused
# glyphBuf[7-8] = dLen
# glyphBuf[9-12] = dOffset
# 13 bytes per glyph
f.write(struct.pack("<BBB b B b B H I", g.width, g.height, g.advance_x, g.left, 0, g.top, 0, g.data_length, g.data_offset))
# Bitmaps
f.write(bytes(glyph_data))
# Bitmaps
f.write(bytes(glyph_data))
print(f"Generated {font_name}.epdfont")