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Compress font data

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This commit is contained in:
Tamás Bálint Misius
2020-12-25 19:39:35 +01:00
parent 55c14fc142
commit 7724a60467
16 changed files with 346 additions and 13661 deletions
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68
fonttool.py
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@@ -1,13 +1,13 @@
#!/usr/bin/env python3
import bz2
import math
import re
import argparse
CP_MAX = 0x10FFFF
FONT_CPP = "data/font.cpp"
FONT_CPP = "data/font.bz2"
FONT_HEIGHT = 12
PTRS_PER_LINE = 8
class ReadBDFError(RuntimeError):
@@ -17,57 +17,27 @@ class ReadBDFError(RuntimeError):
class FontTool:
def __init__(self):
with open(FONT_CPP) as font_cpp:
self.font_cpp_data = font_cpp.read()
font_data = ([int(s, 16) for s in re.findall(r'\w+', re.search(r'font_data[^{]*{([^;]+);', self.font_cpp_data,
re.MULTILINE | re.DOTALL)[1])])
font_ptrs = ([int(s, 16) for s in re.findall(r'\w+', re.search(r'font_ptrs[^{]*{([^;]+);', self.font_cpp_data,
re.MULTILINE | re.DOTALL)[1])])
font_ranges = ([int(s, 16) for s in re.findall(r'\w+',
re.search(r'font_ranges[^{]*{([^;]+);', self.font_cpp_data,
re.MULTILINE | re.DOTALL)[1])])
with open(FONT_CPP, 'rb') as font_cpp:
font_cpp_data = bz2.decompress(font_cpp.read())
i = 0
self.code_points = [False for _ in range(CP_MAX + 2)]
ptrs_ptr = 0
for i in range(len(font_ranges) // 2 - 1):
for cp in range(font_ranges[i * 2], font_ranges[i * 2 + 1] + 1):
base = font_ptrs[ptrs_ptr]
self.code_points[cp] = font_data[base: (base + math.ceil(font_data[base] * FONT_HEIGHT / 4) + 1)]
ptrs_ptr += 1
while i < len(font_cpp_data):
cp = font_cpp_data[i] | (font_cpp_data[i + 1] << 8) | (font_cpp_data[i + 2] << 16)
width = font_cpp_data[i + 3]
n = i + 4 + 3 * width
self.code_points[cp] = font_cpp_data[(i + 3): n]
i = n
def commit(self):
new_ranges = []
in_range = False
l = []
for i, data in enumerate(self.code_points):
if in_range and not data:
new_ranges[-1].append(i - 1)
in_range = False
elif not in_range and data:
in_range = True
new_ranges.append([i])
font_data_lines_hex = [['0x%02X' % v for v in d] for d in filter(lambda x: x, self.code_points)]
font_data_lines = [len(h) > 1 and h[0] + ', ' + ', '.join(h[1:]) + ',' or '0x00, ' for h in
font_data_lines_hex]
font_cpp_data = re.sub(r'font_data[^{]*{([^;]+);',
'font_data[] = {\n ' + '\n '.join(font_data_lines) + '\n};', self.font_cpp_data)
font_ptrs_blocks = []
data_ptr = 0
for ran in new_ranges:
block = []
for cp in range(ran[0], ran[1] + 1):
block.append(data_ptr)
data_ptr += math.ceil(self.code_points[cp][0] * FONT_HEIGHT / 4) + 1
font_ptrs_wrapped = []
for i in range(0, len(block), PTRS_PER_LINE):
font_ptrs_wrapped.append(', '.join(['0x%08X' % v for v in block[i: (i + PTRS_PER_LINE)]]))
font_ptrs_blocks.append(',\n '.join(font_ptrs_wrapped))
font_cpp_data = re.sub(r'font_ptrs[^{]*{([^;]+);',
'font_ptrs[] = {\n ' + ',\n\n '.join(font_ptrs_blocks) + ',\n};', font_cpp_data)
font_ranges_lines = ['{ 0x%06X, 0x%06X },' % (r[0], r[1]) for r in new_ranges]
font_cpp_data = re.sub(r'font_ranges[^{]*{([^;]+);',
'font_ranges[][2] = {\n ' + '\n '.join(font_ranges_lines) + '\n { 0, 0 },\n};',
font_cpp_data)
with open(FONT_CPP, 'w') as font_cpp:
font_cpp.write(font_cpp_data)
if data:
l.append(i & 0xFF)
l.append((i >> 8) & 0xFF)
l.append((i >> 16) & 0xFF)
l += data
with open(FONT_CPP, 'wb') as font_cpp:
font_cpp.write(bz2.compress(bytes(l)))
def pack(cp_matrix):
width = 0