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#!/usr/bin/env python3
"""
// ZX-Evo SDLoad Configuration (c) NedoPC 2023
//
// font generator: takes 6912-positioned font and generates font in internal FPGA format
/*
This file is part of ZX-Evo Base Configuration firmware.
ZX-Evo Base Configuration firmware is free software:
you can redistribute it and/or modify it under the terms of
the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
ZX-Evo Base Configuration firmware is distributed in the hope that
it will be useful, but WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with ZX-Evo Base Configuration firmware.
If not, see <http://www.gnu.org/licenses/>.
*/
"""
import argparse,os,sys
class ZXPic:
def __init__(self,filename):
with open(filename,'rb') as file:
self.zxscr = bytes(file.read())
if( len(self.zxscr)!=6144 and len(self.zxscr)!=6912 ):
sys.exit('Wrong zx file <{}> size, must be 6144 or 6912'.format(filename))
if( len(self.zxscr)==6912 ):
self.colored = True
else:
self.colored = False
self.pixels = bytes(self.zxscr[:6144])
if( self.colored ):
self.attrs = bytes(self.zxscr[6144:])
else:
self.attrs = None
self.sz_x = 256
self.sz_y = 192
def get_pix(self,x,y):
if( x<0 or x>=self.sz_x or y<0 or y>=self.sz_y ):
sys.exit('x,y must be within 0..{} and 0..{} range!'.format(self.sz_x-1,self.sz_y-1))
bitnum = 7 - (x & 7)
offset = (x>>3) + (y & 7)*256 + ((y & 0x38)>>3)*32 + ((y & 0xC0)>>6)*2048
return True if self.pixels[offset] & (1<<bitnum) else False
class CharSet:
def __init__(self, num_els, first_idx, sz_x, sz_y):
num_els = int(num_els)
first_idx = int(first_idx)
sz_x = int(sz_x)
sz_y = int(sz_y)
# check arguments
assert num_els>0, 'num_els must be positive!'
assert first_idx>=0, 'first_idx must be non-negative!'
assert sz_x>0, 'sz_x must be positive!'
assert sz_y>0, 'sz_y must be positive!'
self.num_els = num_els
self.first_idx = first_idx
self.sz_x = sz_x
self.sz_y = sz_y
# generate empty characters
self.charset = [None] * (self.first_idx + self.num_els)
for char_idx in range(self.first_idx, self.first_idx + self.num_els):
char = [None] * self.sz_y
for char_y in range(self.sz_y):
line = [False] * self.sz_x;
char[char_y] = line
self.charset[char_idx] = char
def set_pix(self, char_idx, char_y, char_x, value):
self.charset[char_idx][char_y][char_x] = value
def get_pix(self, char_idx, char_y, char_x):
return self.charset[char_idx][char_y][char_x]
def generate_font(pic, start_cx=0, start_cy=0, blk_sx=8, blk_sy=8, box_offx=0, box_offy=0, box_sx=6, box_sy=6, first_idx=32, num_els=224):
# pic -- byte pic with sizes pic.sz_x, pic.sz_y and get_pix(x,y)
# blk_sx/y -- size of font blocks (bounding boxes), typical 8x8
# start_cx/cy -- coord of first element of font, in blocks (typical upper left, 0/0)
# box_offx/y -- offset of actual box with a letter inside block (typical 0/0)
# box_sx/y -- actual box size, 6/6 for 6x6 font etc.
# first_idx -- font index corresponding to start_cx/y position
# num_els -- how many font elements to parse
# check args
start_cx = int(start_cx)
start_cy = int(start_cy)
blk_sx = int(blk_sx)
blk_sy = int(blk_sy)
box_offx = int(box_offx)
box_offy = int(box_offy)
box_sx = int(box_sx)
box_sy = int(box_sy)
first_idx = int(first_idx)
num_els = int(num_els)
assert first_idx>=0
assert num_els>0
assert blk_sx>0
assert blk_sy>0
assert start_cx>=0
assert start_cy>=0
assert blk_sx*(start_cx+1) <= pic.sz_x
assert blk_sy*(start_cy+1) <= pic.sz_y
assert box_offx>=0
assert box_offy>=0
assert box_sx>0
assert box_sy>0
assert box_offx+box_sx <= blk_sx, 'box_offx+box_sx > blk_sx!'
assert box_offy+box_sy <= blk_sy, 'box_offy+box_sy > blk_sy!'
# create empty font
font = CharSet(num_els, first_idx, box_sx, box_sy)
# load font data
curr_blk_x = start_cx
curr_blk_y = start_cy
pic_overflow = False
for char_idx in range(first_idx, first_idx + num_els):
assert not pic_overflow
# x/y of upper left part of the box
x_origin = curr_blk_x*blk_sx + box_offx
y_origin = curr_blk_y*blk_sy + box_offy
# copy pixels
for y in range(box_sy):
for x in range(box_sx):
font.set_pix(char_idx, y, x, pic.get_pix(x_origin + x, y_origin + y))
# step to next char in bitmap
curr_blk_x = curr_blk_x + 1
if( curr_blk_x*blk_sx >= pic.sz_x ):
curr_blk_x = 0
curr_blk_y = curr_blk_y + 1
if( curr_blk_y*blk_sy >= pic.sz_y ):
curr_blk_y = 0
pic_overflow = True
return font
def gen_binary(font):
binary = bytearray(1024) #zeroed
for i in range(32,256):
for y in range(6):
for x in range(6):
# actual layout of the resulting font is defined here
offs = ((i>>3)*36 + x + y*6) & 0x3FF
#
bit = 1<<(7-(i&7))
if font.get_pix(i,y,x):
binary[offs] = binary[offs] | bit
return binary
def main():
# parse arguments
p = argparse.ArgumentParser()
#
p.add_argument('--scr', '-s', action='store', required=True, help='Filename of 6912 or 6144 ZX screen with font')
p.add_argument('--out', '-o', action='store', required=True, help='Filename prefix for resulting file(s). Extensions will be added as needed')
p.add_argument( '-x', type=int, action='store', default=0, help='Initial X position of 8x8 block with first symbol (that must be a space)')
p.add_argument( '-y', type=int, action='store', default=0, help='Initial Y position of 8x8 block with first symbol (that must be a space)')
#
args = p.parse_args()
pic = ZXPic(args.scr)
font = generate_font(pic=pic,
start_cx=0, start_cy=1,
first_idx=32, num_els=224)
binary = gen_binary(font)
bin_name = args.out + ".bin"
with open(bin_name,"wb") as wrbin:
wrbin.write(binary)
if __name__=="__main__":
main()