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https://github.com/V2RetroComputing/analog.git
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35 lines
978 B
Python
35 lines
978 B
Python
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#!/usr/bin/env python3
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import sys
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fp = sys.stdout
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fp.write("// Mapping of a hires video byte to 14 half-pixel dots.\n")
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fp.write("// Bits are displayed from MSB to LSB.\n")
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fp.write("static uint16_t hires_dot_patterns[256] = {")
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for hiresByteValue in range(256):
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if hiresByteValue % 8 == 0:
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fp.write("\n ")
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bits = 0
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# hires byte consistes of
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# MSB - delay by 1/2 'pixel'
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# bits[0:6] - pixel bits, displayed from LSB to MSB
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# Want to output a doubled resolution bitmap of 14 bits
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# that is shifted according to the MSB, and bit-reversed so
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# it is displayed MSB to LSB
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for i in range(7):
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bits <<= 2
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if hiresByteValue & 1:
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bits |= 0x3
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hiresByteValue >>= 1
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if hiresByteValue & 1:
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# Output pixels are delayed by an extra half-pixel
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bits >>= 1
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#print("0b{:014b}".format(bits))
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fp.write("0x{:04x},".format(bits))
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fp.write("\n};\n")
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