kopia lustrzana https://github.com/peterhinch/micropython-samples
54 wiersze
2.3 KiB
Python
54 wiersze
2.3 KiB
Python
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class PyFont(object):
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def __init__(self, font, index, vert, horiz, nchars):
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self.firstchar = 32 # ord(first_character) Future use: absent from C file.
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self.nchars = nchars # No. of chars in font
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self.bits_horiz = horiz # Width in pixels of char if rendered as monospaced
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self.bits_vert = vert # Height in pixels
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self.bytes_vert = (self.bits_vert + 7) // 8 # Height in bytes
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self.bytes_per_ch = self.bytes_vert * horiz # Total bytes per monospaced character
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self.monospaced = False
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self.char = bytearray(self.bytes_per_ch)
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self.mv = memoryview(self.char)
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self._index = index
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self._font = font
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self._zero = bytearray(self.bytes_per_ch)
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self._mvzero = memoryview(self._zero)
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def get_idx(self, relch):
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offset = relch * 2 # index is 2 bytes/char
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return self._index[offset] + (self._index[offset + 1] << 8)
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def get_ch(self, ch):
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relch = max(0, ch - self.firstchar) # This is the behaviour you requested. In my view it should throw a ValueError.
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if relch > self.nchars:
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relch = 0
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offset = self.get_idx(relch)
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delta = self.get_idx(relch + 1) - offset
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bv = self.bits_vert
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mv = self.mv
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if self.monospaced:
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bh = self.bits_horiz # Char width in bits
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mv[: delta] = self._font[offset : offset + delta]
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mv[delta : self.bytes_per_ch] = self._mvzero[delta : self.bytes_per_ch]
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bh = self.bits_horiz
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else:
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mv[: delta] = self._font[offset : offset + delta]
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bh = delta // self.bytes_vert
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return bh # horizontal increment for character location
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# Demo/test of rendering to the REPL
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def render(self, ch): # enter with ord(ch)
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bh = self.get_ch(ch)
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bv = self.bits_vert # Cache for speed
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mv = self.mv
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for bit_vert in range(bv): # for each vertical line
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bytenum, bitnum = divmod(bit_vert, 8)
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bit = 1 << bitnum
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for bit_horiz in range(bh): # horizontal line
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fontbyte = self.mv[self.bytes_vert * bit_horiz + bytenum]
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print('*' if fontbyte & bit else ' ', end = '')
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print('|')
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return bh # Caller accounts for horzontal increment
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