194 lines
7.2 KiB
Python
194 lines
7.2 KiB
Python
# The MIT License (MIT)
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#
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# Copyright (c) 2019 Scott Shawcroft for Adafruit Industries LLC
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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"""
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`adafruit_bitmap_font.bdf`
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====================================================
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Loads BDF format fonts.
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* Author(s): Scott Shawcroft
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Implementation Notes
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--------------------
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**Hardware:**
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**Software and Dependencies:**
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* Adafruit CircuitPython firmware for the supported boards:
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https://github.com/adafruit/circuitpython/releases
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"""
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import gc
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from fontio import Glyph
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from .glyph_cache import GlyphCache
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__version__ = "0.0.0-auto.0"
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__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_Bitmap_Font.git"
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class BDF(GlyphCache):
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"""Loads glyphs from a BDF file in the given bitmap_class."""
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def __init__(self, f, bitmap_class):
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super().__init__()
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self.file = f
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self.name = f
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self.file.seek(0)
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self.bitmap_class = bitmap_class
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line = self.file.readline()
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line = str(line, "utf-8")
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if not line or not line.startswith("STARTFONT 2.1"):
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raise ValueError("Unsupported file version")
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self.point_size = None
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self.x_resolution = None
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self.y_resolution = None
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def get_bounding_box(self):
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"""Return the maximum glyph size as a 4-tuple of: width, height, x_offset, y_offset"""
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self.file.seek(0)
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while True:
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line = self.file.readline()
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line = str(line, "utf-8")
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if not line:
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break
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if line.startswith("FONTBOUNDINGBOX "):
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_, x, y, x_offset, y_offset = line.split()
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return (int(x), int(y), int(x_offset), int(y_offset))
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return None
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def load_glyphs(self, code_points):
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# pylint: disable=too-many-statements,too-many-branches,too-many-nested-blocks,too-many-locals
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metadata = True
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character = False
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code_point = None
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bytes_per_row = 1
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desired_character = False
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current_info = {}
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current_y = 0
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rounded_x = 1
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if isinstance(code_points, int):
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remaining = set()
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remaining.add(code_points)
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elif isinstance(code_points, str):
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remaining = set(ord(c) for c in code_points)
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elif isinstance(code_points, set):
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remaining = code_points
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else:
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remaining = set(code_points)
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for code_point in remaining:
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if code_point in self._glyphs and self._glyphs[code_point]:
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remaining.remove(code_point)
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if not remaining:
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return
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x, _, _, _ = self.get_bounding_box()
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self.file.seek(0)
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while True:
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line = self.file.readline()
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if not line:
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break
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if line.startswith(b"CHARS "):
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metadata = False
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elif line.startswith(b"SIZE"):
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_, self.point_size, self.x_resolution, self.y_resolution = line.split()
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elif line.startswith(b"COMMENT"):
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pass
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elif line.startswith(b"STARTCHAR"):
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# print(lineno, line.strip())
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# _, character_name = line.split()
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character = True
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elif line.startswith(b"ENDCHAR"):
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character = False
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if desired_character:
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bounds = current_info["bounds"]
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shift = current_info["shift"]
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gc.collect()
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self._glyphs[code_point] = Glyph(
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current_info["bitmap"],
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0,
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bounds[0],
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bounds[1],
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bounds[2],
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bounds[3],
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shift[0],
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shift[1],
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)
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remaining.remove(code_point)
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if not remaining:
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return
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desired_character = False
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elif line.startswith(b"BBX"):
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if desired_character:
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_, x, y, x_offset, y_offset = line.split()
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x = int(x)
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y = int(y)
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x_offset = int(x_offset)
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y_offset = int(y_offset)
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current_info["bounds"] = (x, y, x_offset, y_offset)
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current_info["bitmap"] = self.bitmap_class(x, y, 2)
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elif line.startswith(b"BITMAP"):
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if desired_character:
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rounded_x = x // 8
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if x % 8 > 0:
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rounded_x += 1
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bytes_per_row = rounded_x
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if bytes_per_row % 4 > 0:
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bytes_per_row += 4 - bytes_per_row % 4
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current_y = 0
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elif line.startswith(b"ENCODING"):
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_, code_point = line.split()
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code_point = int(code_point)
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if code_point in remaining:
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desired_character = True
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current_info = {"bitmap": None, "bounds": None, "shift": None}
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elif line.startswith(b"DWIDTH"):
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if desired_character:
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_, shift_x, shift_y = line.split()
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shift_x = int(shift_x)
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shift_y = int(shift_y)
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current_info["shift"] = (shift_x, shift_y)
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elif line.startswith(b"SWIDTH"):
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pass
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elif character:
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if desired_character:
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bits = int(line.strip(), 16)
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width = current_info["bounds"][0]
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start = current_y * width
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x = 0
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for i in range(rounded_x):
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val = (bits >> ((rounded_x - i - 1) * 8)) & 0xFF
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for j in range(7, -1, -1):
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if x >= width:
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break
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bit = 0
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if val & (1 << j) != 0:
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bit = 1
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current_info["bitmap"][start + x] = bit
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x += 1
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current_y += 1
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elif metadata:
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# print(lineno, line.strip())
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pass
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