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from .glyph_cache import GlyphCache
class BDF(GlyphCache):
def __init__(self, f, bitmap_class):
super().__init__()
self.file = f
self.name = f
self.file.seek(0)
self.bitmap_class = bitmap_class
line = self.file.readline()
line = str(line, "utf-8")
if not line or not line.startswith("STARTFONT 2.1"):
raise ValueError("Unsupported file version")
def get_bounding_box(self):
self.file.seek(0)
while True:
line = self.file.readline()
line = str(line, "utf-8")
if not line:
break
if line.startswith("FONTBOUNDINGBOX "):
_, x, y, dx, dy = line.split()
return (int(x), int(y), int(dx), int(dy))
return None
def load_glyphs(self, code_points):
metadata = True
character = False
code_point = None
rounded_x = 1
bytes_per_row = 1
desired_character = False
current_info = None
current_y = 0
total_remaining = len(code_points)
x, _, _, _ = self.get_bounding_box()
# create a scratch bytearray to load pixels into
scratch_row = memoryview(bytearray((((x-1)//32)+1) * 4))
self.file.seek(0)
while True:
line = self.file.readline()
if not line:
break
if line.startswith(b"CHARS "):
metadata = False
elif line.startswith(b"SIZE"):
_, self.point_size, self.x_resolution, self.y_resolution = line.split()
elif line.startswith(b"COMMENT"):
pass
elif line.startswith(b"STARTCHAR"):
# print(lineno, line.strip())
#_, character_name = line.split()
character = True
elif line.startswith(b"ENDCHAR"):
character = False
if desired_character:
self._glyphs[code_point] = current_info
if total_remaining == 0:
return
desired_character = False
elif line.startswith(b"BBX"):
if desired_character:
_, x, y, dx, dy = line.split()
x = int(x)
y = int(y)
dx = int(dx)
dy = int(dy)
current_info["bounds"] = (x, y, dx, dy)
current_info["bitmap"] = self.bitmap_class(x, y, 2)
elif line.startswith(b"BITMAP"):
if desired_character:
rounded_x = x // 8
if x % 8 > 0:
rounded_x += 1
bytes_per_row = rounded_x
if bytes_per_row % 4 > 0:
bytes_per_row += 4 - bytes_per_row % 4
current_y = 0
elif line.startswith(b"ENCODING"):
_, code_point = line.split()
code_point = int(code_point)
if code_point == code_points or code_point in code_points:
total_remaining -= 1
if code_point not in self._glyphs or not self._glyphs[code_point]:
desired_character = True
current_info = {"bitmap": None, "bounds": None, "shift": None}
elif line.startswith(b"DWIDTH"):
if desired_character:
_, shift_x, shift_y = line.split()
shift_x = int(shift_x)
shift_y = int(shift_y)
current_info["shift"] = (shift_x, shift_y)
elif line.startswith(b"SWIDTH"):
pass
elif character:
if desired_character:
bits = int(line.strip(), 16)
for i in range(rounded_x):
val = (bits >> ((rounded_x-i-1)*8)) & 0xFF
scratch_row[i] = val
current_info["bitmap"]._load_row(current_y, scratch_row[:bytes_per_row])
current_y += 1
elif metadata:
#print(lineno, line.strip())
pass
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