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#!/usr/bin/env python3
import argparse
import subprocess
import os
import json
from PIL import Image
# Define the character ranges we want to include
CHAR_RANGES = [
(32, 126), # Printable ASCII
# Add more ranges here as needed, e.g.:
# (160, 255), # Extended Latin
]
def calculate_grid_size(char_ranges):
"""Calculate the smallest square grid that fits the highest character code"""
max_char = max(end for _, end in char_ranges)
grid_size = 1
while grid_size * grid_size < max_char:
grid_size += 1
return grid_size
def generate_atlas(font_path, resolution, draw_grid=False):
# Calculate grid size based on character ranges
grid_size = calculate_grid_size(CHAR_RANGES)
cell_size = resolution // grid_size
# Convert character ranges to command-line format
chars_str = ", ".join(f"[{start}, {end}]" for start, end in CHAR_RANGES)
cmd = [
"msdf-atlas-gen/build/bin/Debug/msdf-atlas-gen.exe",
"-font", font_path,
"-type", "mtsdf",
"-format", "png",
"-imageout", "atlas.png",
"-json", "atlas.json",
"-size", "32",
"-pxrange", "2",
"-dimensions", str(resolution), str(resolution),
"-chars", chars_str,
"-uniformgrid",
"-uniformcols", str(grid_size),
"-uniformcell", str(cell_size), str(cell_size),
"-uniformorigin", "on",
"-coloringstrategy", "inktrap",
"-errorcorrection", "auto",
"-miterlimit", "1.0",
"-scanline"
]
try:
print("Running msdf-atlas-gen...")
result = subprocess.run(cmd, check=True, capture_output=True, text=True)
# Print the output
if result.stdout:
print("msdf-atlas-gen output:")
print(result.stdout)
# Rearrange the atlas to include gaps for non-printable characters
rearrange_atlas(resolution, cell_size, cell_size, draw_grid)
return True
except subprocess.CalledProcessError as e:
print(f"Error generating atlas: {e}")
print(f"Error output: {e.stderr}")
return False
def draw_grid_lines(image, resolution):
"""Draw red grid lines on the image"""
draw = ImageDraw.Draw(image)
grid_size = calculate_grid_size(CHAR_RANGES)
# Draw vertical lines
for x in range(grid_size):
line_x = x * resolution // grid_size
draw.line([(line_x, 0), (line_x, resolution-1)], fill=(255, 0, 0), width=1)
# Draw horizontal lines
for y in range(grid_size):
line_y = y * resolution // grid_size
draw.line([(0, line_y), (resolution-1, line_y)], fill=(255, 0, 0), width=1)
# Draw the final borders
draw.line([(resolution-1, 0), (resolution-1, resolution-1)], fill=(255, 0, 0), width=1)
draw.line([(0, resolution-1), (resolution-1, resolution-1)], fill=(255, 0, 0), width=1)
def rearrange_atlas(resolution, cell_width, cell_height, draw_grid=False):
"""Rearrange the atlas to include gaps for non-printable characters"""
original = Image.open("atlas.png")
new_atlas = Image.new('RGBA', (resolution, resolution), (0, 0, 0, 255))
grid_size = calculate_grid_size(CHAR_RANGES)
cell_size = resolution // grid_size
# Track current position in the source atlas
source_index = 0
# Process each character range
for start, end in CHAR_RANGES:
for ascii_code in range(start, end + 1):
# Calculate source position (original atlas)
source_x = (source_index % grid_size) * cell_size
source_y = (source_index // grid_size) * cell_size
# Calculate target position (new atlas)
target_x = ((ascii_code + 1) % grid_size) * cell_size
target_y = ((ascii_code + 1) // grid_size) * cell_size
# Extract and paste the glyph
glyph = original.crop((
source_x,
source_y,
source_x + cell_size,
source_y + cell_size
))
new_atlas.paste(glyph, (target_x, target_y))
source_index += 1
# Draw the grid lines only if requested
if draw_grid:
draw_grid_lines(new_atlas, resolution)
# Save the rearranged atlas, overwriting the original
new_atlas.save("atlas.png")
print("Atlas rearranged successfully!")
def main():
parser = argparse.ArgumentParser(description='Generate a font atlas using msdf-atlas-gen')
parser.add_argument('font_path', help='Path to the font file (.ttf/.otf)')
parser.add_argument('resolution', type=int, help='Total atlas resolution (width=height)')
parser.add_argument('--grid', action='store_true', help='Draw grid lines on the output atlas')
args = parser.parse_args()
# Verify font file exists
if not os.path.isfile(args.font_path):
print(f"Error: Font file not found at {args.font_path}")
return
generate_atlas(args.font_path, args.resolution, args.grid)
if __name__ == "__main__":
main()
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