92 lines
2.8 KiB
Python
92 lines
2.8 KiB
Python
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#!/usr/bin/env python3
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import sys
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import PIL
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from PIL import Image
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from numpy import asarray
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CHAR_WIDTH = 8
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CHAR_HEIGHT = 8
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CHAR_FIRST = 32
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CHROMA = 14
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def main(argv):
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image = Image.open('Art/Assets/Font8x8.gif')
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pixels = asarray(image)
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numCharX = (int)(image.size[0]/CHAR_WIDTH)
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numCharY = (int)(image.size[1]/CHAR_HEIGHT)
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for charY in range(0,1): #numCharY):
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for charX in range(1,2): #numCharX):
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charIndex = charY*numCharX + charX
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currChar = chr(charIndex+CHAR_FIRST)
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print ("char%d:\n" % ord(currChar), end="")
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# Header for each rendering operation
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print ("\ttya") # Transfer character VRAM position from Y to stack pointer
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print ("\ttcs")
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# Iteratre through all the pixels
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charOriginX = charX*CHAR_WIDTH
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charOriginY = charY*CHAR_HEIGHT
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for charRow in reversed(range(0,CHAR_HEIGHT)):
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print ("\t; Line %d" % charRow)
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nextRowDelta = 160
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for charCol in reversed(range(0,CHAR_WIDTH,4)):
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nibbles = [pixels[charOriginY+charRow][charOriginX+charCol],
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pixels[charOriginY+charRow][charOriginX+charCol+1],
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pixels[charOriginY+charRow][charOriginX+charCol+2],
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pixels[charOriginY+charRow][charOriginX+charCol+3]]
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word = nibbles[2]<<12 | nibbles[3]<<8 | nibbles[0]<<4 | nibbles[1]
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if (nibbles[0]==CHROMA and nibbles[1]==CHROMA and nibbles[2]==CHROMA and nibbles[3]==CHROMA):
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pass # Case 1 : All chroma, so let stack advance with no work
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elif (nibbles[0]!=CHROMA and nibbles[1]!=CHROMA and nibbles[2]!=CHROMA and nibbles[3]!=CHROMA):
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print ("\tpea $%04x" % word) # Case 2 : No chroma, so fast push
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nextRowDelta -= 2
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else:
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mask = 0 # Case 3 : Mixed chroma, so mask and or
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if (nibbles[0]!=CHROMA):
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mask = mask | 0xFF0F
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if (nibbles[1]!=CHROMA):
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mask = mask | 0xFFF0
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if (nibbles[2]!=CHROMA):
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mask = mask | 0x0FFF
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if (nibbles[3]!=CHROMA):
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mask = mask | 0xF0FF
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sprite = word
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if (nibbles[0]==CHROMA):
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sprite = sprite & 0xFF0F
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if (nibbles[1]==CHROMA):
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sprite = sprite & 0xFFF0
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if (nibbles[2]==CHROMA):
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sprite = sprite & 0x0FFF
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if (nibbles[3]==CHROMA):
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sprite = sprite & 0xF0FF
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print ("\ttsc") # Keep stack moving, even though we didn't use it
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print ("\tdec")
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print ("\tdec")
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print ("\ttcs")
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print ("\tlda 0,S") # Blend mask, sprite, and background
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print ("\tand #$%04x" % mask)
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print ("\tora #$%04x" % sprite)
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print ("\tsta 0,S")
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nextRowDelta -= 2
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# Advance stack pointer to next row
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print ("\ttsc")
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print ("\tsec")
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print ("\tsbc #%d" % nextRowDelta)
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print ("\ttcs")
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# Footer for each rendering operation
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print ("\tjmp returnFromTest")
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if __name__ == "__main__":
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main(sys.argv[1:])
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