503 lines
16 KiB
Python
503 lines
16 KiB
Python
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#!/usr/bin/env python3
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"""
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Generate period-accurate decorative GIFs for 90s retro websites.
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Creates pixel art icons, bullet points, animated badges, etc.
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"""
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import struct
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import os
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import sys
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def create_gif(width, height, frames=None, loop=0):
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"""Create a GIF89a image with optional animation frames.
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frames: list of [[(r,g,b), ...], ...] where each frame is pixel colour array
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If frames is None, creates a simple solid colour image at 1x1"""
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if frames is None:
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# Default to simple solid colour
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frames = [[(255, 255, 255)]]
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if len(frames[0]) == 0:
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frames = [[(0, 0, 0)]]
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# Build a master frame for header dimensions
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fh, fw = len(frames[0]), len(frames[0][0]) if frames[0] else 1
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# GIF Header
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header = b'GIF89a'
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# Logical Screen Descriptor
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lsd = struct.pack('<HH', fw, fh)
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lsd += b'\x00' # No GCT, 8-bit colour resolution
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lsd += b'\x00' # Background colour index
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lsd += b'\x00' # Pixel aspect ratio
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# Image Descriptor for each frame
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all_img_data = b''
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for frame_data in frames:
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fheight = len(frame_data)
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fwidth = len(frame_data[0]) if frame_data else 1
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img = b'\x2C' # Image Separator
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img += struct.pack('<HHHH', 0, 0, fwidth, fheight)
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img += b'\x00' # no local colour table
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# LZW minimum code size
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img += bytes([2])
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col_index = 1 # use colour index 1 (2 colours = 2-bit codes)
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# Build data for each pixel
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for row in frame_data:
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for pixel in row:
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total_pixels = fwidth * fheight
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raw_bits = 1
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bits = []
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for _ in range(total_pixels):
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bits.append(1)
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bitstream = ''.join(str(b) for b in bits)
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data_bytes = bytearray()
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for i in range(0, len(bitstream), 8):
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byte = bitstream[i:i+8]
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if len(byte) < 8:
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byte = byte.ljust(8, '0')
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data_bytes.append(int(byte, 2))
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clear_code = 4
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eoi_code = 5
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sub_data = bytes([clear_code]) + bytes(data_bytes) + bytes([eoi_code])
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i = 0
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while i < len(sub_data):
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block_size = min(255, len(sub_data) - i)
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img += bytes([block_size])
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img += sub_data[i:i+block_size]
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i += block_size
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img += b'\x00' # sub-block terminator
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img += b'\x3B' # trailer
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return header + lsd + all_img_data
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def write_single_pixel_gif(filepath, r, g, b, ext=''):
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"""Create a minimal single-pixel GIF with a given colour, using raw bytes.
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More reliable than the complex LZW encoder above."""
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# Minimal valid GIF89a: 1x1 pixel, single colour
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gif = bytearray()
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gif.extend(b'GIF89a')
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# Logical Screen Descriptor
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gif += struct.pack('<HH', 1, 1)
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gif += b'\x80' # GCT present, 1-bit colour resolution, 2^1=2 colours
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gif += b'\x00' # background
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gif += b'\x00' # aspect ratio
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# Global Color Table: 2 entries (index 0 = black, index 1 = target colour)
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gif += b'\x00\x00\x00' # index 0: black
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gif += struct.pack('BBB', r, g, b) # index 1: target colour
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# Image Descriptor
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gif += b'\x2C' # image separator
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gif += struct.pack('<HHHH', 0, 0, 1, 1)
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gif += b'\x00' # no local colour table
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# LZW minimum code size
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gif.append(2)
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# Image data sub-block
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gif += bytes([4, 2, 0x02, 0x00, 5, 0x00]) # clear, data, eoi in compact form
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gif += b'\x3B' # trailer
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with open(filepath, 'wb') as f:
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f.write(bytes(gif))
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def write_pixel_image_gif(filepath, pixels, fg=(255,255,255), bg=(0,0,0)):
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"""Write a small pixel-art GIF. pixels = 2D array of 0 (bg) or 1 (fg)"""
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w = len(pixels[0])
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h = len(pixels)
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gif = bytearray()
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gif.extend(b'GIF89a')
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gif += struct.pack('<HH', w, h)
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gif += b'\x80' # GCT present, 1-bit
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gif += b'\x00\x00'
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# GCT: index 0 = bg, index 1 = fg
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gif += struct.pack('BBB', *bg)
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gif += struct.pack('BBB', *fg)
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# Image Descriptor
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gif += b'\x2C'
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gif += struct.pack('<HHHH', 0, 0, w, h)
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gif += b'\x00'
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# LZW code size
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gif.append(2)
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# Create pixel data as bit stream
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bits = bytearray()
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for y in range(h):
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for x in range(w):
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bits.append(pixels[y][x])
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# Pack into bytes (MSB first)
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data = bytearray()
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for i in range(0, len(bits), 8):
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byte = 0
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for j in range(8):
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if i + j < len(bits):
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byte |= (bits[i+j] << (7-j))
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data.append(byte)
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# Encode: clear + data + eoi
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sub_data = bytearray()
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sub_data.append(4) # clear code (100 in binary for 2-bit)
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# Add pixel runs
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for i, b in enumerate(bits):
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sub_data.append(b)
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sub_data.append(5) # EOI
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sub_data.append(0) # terminator for last byte
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# Write sub-blocks
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offset = 0
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while offset < len(sub_data):
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block_size = min(255, len(sub_data) - offset)
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gif.append(block_size)
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gif.extend(sub_data[offset:offset+block_size])
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offset += block_size
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gif.append(0) # sub-block terminator
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gif.append(0x3B) # trailer
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with open(filepath, 'wb') as f:
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f.write(bytes(gif))
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def main():
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outdir = sys.argv[1] if len(sys.argv) > 1 else './retro-images'
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os.makedirs(outdir, exist_ok=True)
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created = 0
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# ========== SPACER GIFS (simple single-pixel) ==========
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spacers = [
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('blue.gif', 0, 0, 200),
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('navy.gif', 0, 0, 128),
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('white.gif', 255, 255, 255),
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('grey.gif', 192, 192, 192),
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('light_grey.gif', 220, 220, 220),
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('dark_grey.gif', 100, 100, 100),
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('red.gif', 200, 0, 0),
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('yellow.gif', 255, 255, 0),
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('green.gif', 0, 255, 0),
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('orange.gif', 255, 165, 0),
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('cyan.gif', 0, 255, 255),
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('magenta.gif', 255, 0, 255),
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('gold.gif', 255, 215, 0),
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('transparent.gif', 0, 0, 0), # special handling
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]
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for fname, r, g, b in spacers:
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if fname == 'transparent.gif':
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# Transparent 1x1 GIF
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gif = bytearray(b'GIF89a')
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gif += struct.pack('<HH', 1, 1)
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gif += b'\x80\x00\x00\x00' # GCT, 1-bit
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gif += b'\x00\x00\x00' # transparent (index 0)
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gif += b'\x00\xFF\x00' # solid (index 1, arbitrary colour)
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gif += b'\x21\xF9\x04\x01\x00\x00\x00\x00' # graphics control extension for transparency
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gif += b'\x2C' # image separator
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gif += struct.pack('<HHHH', 0, 0, 1, 1)
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gif += b'\x00'
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gif.append(2) # min code size
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gif += bytes([4, 1, 1, 2, 0x02, 0x00, 5, 0x00])
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gif += b'\x3B'
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with open(os.path.join(outdir, fname), 'wb') as f:
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f.write(bytes(gif))
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print(f" OK {fname:20s} (1x1 transparent)")
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else:
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write_single_pixel_gif(os.path.join(outdir, fname), r, g, b)
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print(f" OK {fname:20s} ({r},{g},{b})")
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created += len(spacers)
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# ========== BULLET DOT ==========
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# Small 8x8 diamond bullet
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bullet = [
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[0,0,0,1,1,0,0,0],
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[0,0,1,1,1,1,0,0],
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[0,1,1,1,1,1,1,0],
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[1,1,1,1,1,1,1,1],
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[1,1,1,1,1,1,1,1],
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[0,1,1,1,1,1,1,0],
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[0,0,1,1,1,1,0,0],
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[0,0,0,1,1,0,0,0],
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]
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write_pixel_image_gif(os.path.join(outdir, 'bullet.gif'), bullet, fg=(0,0,200), bg=(0,0,0))
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print(" OK bullet.gif (8x8 blue diamond bullet)")
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created += 1
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# ========== NEW! BADGE ==========
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new_badge = [
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[1,1,1,1,1,1,1,1,1,1,1,1],
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[1,0,0,0,0,0,0,0,0,0,0,1],
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[1,0,1,1,1,0,0,1,1,1,0,1],
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[1,0,1,0,1,0,0,0,1,0,0,1],
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[1,0,1,1,1,0,0,1,1,0,0,1],
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[1,0,1,0,1,0,0,0,0,0,0,1],
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[1,0,1,1,1,0,0,1,1,1,1,1],
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[1,0,0,0,0,0,0,0,0,0,0,1],
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[1,1,1,1,1,1,1,1,1,1,1,1],
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]
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write_pixel_image_gif(os.path.join(outdir, 'new.gif'), new_badge, fg=(255, 0, 0), bg=(255, 255, 0))
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print(" OK new.gif (9x12 red 'NEW!' badge on yellow)")
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created += 1
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# ========== STAR ==========
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star = [
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[0,0,0,1,0,0,0],
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[0,0,1,1,1,0,0],
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[0,1,1,1,1,1,0],
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[1,1,0,1,0,1,1],
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[1,0,0,0,0,0,1],
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[0,1,1,1,1,1,0],
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[0,0,1,1,1,0,0],
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[0,1,1,0,1,1,0],
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]
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write_pixel_image_gif(os.path.join(outdir, 'star.gif'), star, fg=(255, 215, 0), bg=(0, 0, 0))
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print(" OK star.gif (7x8 gold star)")
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created += 1
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# ========== SPARKLE ==========
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sparkle = [
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[0,0,1,0,0],
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[0,0,1,0,0],
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[1,1,1,1,1],
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[0,0,1,0,0],
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[0,0,1,0,0],
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]
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write_pixel_image_gif(os.path.join(outdir, 'sparkle.gif'), sparkle, fg=(0, 255, 255), bg=(0, 0, 0))
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print(" OK sparkle.gif (5x5 cyan sparkle)")
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created += 1
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# ========== MAILTO ENVELOPE ==========
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mail = [
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[1,1,1,1,1,1,1,1],
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[1,0,0,0,0,0,0,1],
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[1,0,0,1,0,0,0,1],
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[1,0,1,0,0,1,0,1],
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[1,0,0,0,0,0,0,1],
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[1,0,0,0,0,0,0,1],
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[1,1,1,1,1,1,1,1],
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]
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write_pixel_image_gif(os.path.join(outdir, 'mailto.gif'), mail, fg=(255, 255, 0), bg=(0, 50, 0))
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print(" OK mailto.gif (7x8 yellow envelope on dark green)")
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created += 1
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# ========== CONSTRUCTION SIGN ==========
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construction = [
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[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
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[1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1],
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[1,1,0,0,1,0,1,0,1,0,1,0,0,0,1,1],
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[1,1,0,0,0,1,0,1,0,1,0,0,0,1,1,1],
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[1,1,0,0,1,0,1,0,1,0,1,0,0,0,1,1],
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[1,1,0,0,0,1,0,1,0,1,0,0,0,1,1,1],
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[1,1,0,0,1,0,1,0,1,0,1,0,0,0,1,1],
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[1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,1],
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[1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,1],
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[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
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]
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write_pixel_image_gif(os.path.join(outdir, 'construction.gif'), construction, fg=(255, 165, 0), bg=(0, 0, 0))
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print(" OK construction.gif (9x16 orange construction icon)")
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created += 1
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# ========== EMAIL ICON ==========
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email_icon = [
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[0,1,1,1,1,1,1,0],
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[1,1,0,0,0,0,1,1],
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[1,0,1,0,0,1,0,1],
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[1,0,0,1,1,0,0,1],
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[1,0,0,0,0,0,0,1],
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[1,1,0,0,0,0,1,1],
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[0,1,1,1,1,1,1,0],
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]
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|
|
write_pixel_image_gif(os.path.join(outdir, 'email_icon.gif'), email_icon, fg=(0, 0, 200), bg=(0, 0, 0))
|
||
|
|
print(" OK email_icon.gif (7x8 blue mail icon)")
|
||
|
|
created += 1
|
||
|
|
|
||
|
|
# ========== WEB RING SYMBOL ==========
|
||
|
|
webring = [
|
||
|
|
[0,0,1,1,1,1,1,1,0,0],
|
||
|
|
[0,1,0,0,0,0,0,0,1,0],
|
||
|
|
[1,0,1,0,0,0,0,1,0,1],
|
||
|
|
[1,0,0,1,0,0,1,0,0,1],
|
||
|
|
[1,0,0,0,1,1,0,0,0,1],
|
||
|
|
[1,0,0,0,1,1,0,0,0,1],
|
||
|
|
[1,0,0,1,0,0,1,0,0,1],
|
||
|
|
[1,0,1,0,0,0,0,1,0,1],
|
||
|
|
[0,1,0,0,0,0,0,0,1,0],
|
||
|
|
[0,0,1,1,1,1,1,1,0,0],
|
||
|
|
]
|
||
|
|
write_pixel_image_gif(os.path.join(outdir, 'webring.gif'), webring, fg=(0, 200, 0), bg=(0, 0, 0))
|
||
|
|
print(" OK webring.gif (10x10 green ring icon)")
|
||
|
|
created += 1
|
||
|
|
|
||
|
|
# ========== FIREFLAME BOTTOM BAR ==========
|
||
|
|
flame = [
|
||
|
|
[0,0,0,0,1,1,0,0,0,0],
|
||
|
|
[0,0,0,1,1,1,1,0,0,0],
|
||
|
|
[0,0,1,1,0,0,1,1,0,0],
|
||
|
|
[0,1,1,0,1,1,0,1,1,0],
|
||
|
|
[1,1,0,1,1,1,1,0,1,1],
|
||
|
|
[1,0,1,0,0,0,0,1,0,1],
|
||
|
|
[1,1,1,1,1,1,1,1,1,1],
|
||
|
|
[0,0,0,0,0,0,0,0,0,0],
|
||
|
|
]
|
||
|
|
write_pixel_image_gif(os.path.join(outdir, 'flame.gif'), flame, fg=(255, 100, 0), bg=(0, 0, 0))
|
||
|
|
print(" OK flame.gif (8x10 orange flame icon)")
|
||
|
|
created += 1
|
||
|
|
|
||
|
|
# ========== NAV ARROW ==========
|
||
|
|
arrow_right = [
|
||
|
|
[0,0,0,0,1,0,0,0],
|
||
|
|
[0,0,0,1,1,0,0,0],
|
||
|
|
[0,0,0,1,1,0,0,0],
|
||
|
|
[1,0,1,1,0,1,0,0],
|
||
|
|
[0,0,0,1,1,0,0,0],
|
||
|
|
[0,0,0,1,1,0,0,0],
|
||
|
|
[0,0,0,0,1,0,0,0],
|
||
|
|
]
|
||
|
|
write_pixel_image_gif(os.path.join(outdir, 'arrow_right.gif'), arrow_right, fg=(0, 255, 0), bg=(0, 0, 0))
|
||
|
|
print(" OK arrow_right.gif (7x8 green right arrow)")
|
||
|
|
created += 1
|
||
|
|
|
||
|
|
arrow_left = [
|
||
|
|
[0,0,0,1,0,0,0,0],
|
||
|
|
[0,0,0,1,0,0,0,0],
|
||
|
|
[0,0,0,1,0,0,0,0],
|
||
|
|
[0,0,1,0,0,1,0,0],
|
||
|
|
[0,0,0,1,0,0,0,0],
|
||
|
|
[0,0,0,1,0,0,0,0],
|
||
|
|
[0,0,0,1,0,0,0,0],
|
||
|
|
]
|
||
|
|
write_pixel_image_gif(os.path.join(outdir, 'arrow_left.gif'), arrow_left, fg=(0, 255, 0), bg=(0, 0, 0))
|
||
|
|
print(" OK arrow_left.gif (7x8 green left arrow)")
|
||
|
|
created += 1
|
||
|
|
|
||
|
|
# ========== TILDED STAR (for decorative headings) ==========
|
||
|
|
tstar = []
|
||
|
|
for row_data in [
|
||
|
|
[0,0,0,0,1,0,0,0,0],
|
||
|
|
[0,0,0,1,1,1,0,0,0],
|
||
|
|
[0,0,1,1,1,1,1,0,0],
|
||
|
|
[0,1,1,1,1,1,1,1,0],
|
||
|
|
[1,1,0,1,1,1,0,1,1],
|
||
|
|
[1,0,0,0,1,0,0,0,1],
|
||
|
|
[0,1,1,1,1,1,1,1,0],
|
||
|
|
[0,0,1,0,0,0,1,0,0],
|
||
|
|
[0,0,0,1,0,1,0,0,0],
|
||
|
|
]:
|
||
|
|
tstar.append(row_data)
|
||
|
|
write_pixel_image_gif(os.path.join(outdir, 'tstar.gif'), tstar, fg=(255, 255, 0), bg=(0, 0, 0))
|
||
|
|
print(" OK tstar.gif (9x9 yellow star")
|
||
|
|
created += 1
|
||
|
|
|
||
|
|
# ========== COUNTER DIGITS ==========
|
||
|
|
# Simple 5x3 pixel digit glyphs for visitor counter
|
||
|
|
# Digits 0-9 as 5-col, 3-row arrays
|
||
|
|
digits = {
|
||
|
|
0: [
|
||
|
|
[1,1,1,0,0],
|
||
|
|
[1,0,0,1,0],
|
||
|
|
[1,1,1,0,0],
|
||
|
|
],
|
||
|
|
1: [
|
||
|
|
[0,1,0,0,0],
|
||
|
|
[1,1,0,0,0],
|
||
|
|
[1,1,1,0,0],
|
||
|
|
],
|
||
|
|
2: [
|
||
|
|
[1,1,1,0,0],
|
||
|
|
[0,0,1,1,0],
|
||
|
|
[1,1,0,1,0],
|
||
|
|
],
|
||
|
|
3: [
|
||
|
|
[1,1,1,0,0],
|
||
|
|
[0,0,1,1,0],
|
||
|
|
[1,1,1,0,0],
|
||
|
|
],
|
||
|
|
4: [
|
||
|
|
[1,0,0,1,0],
|
||
|
|
[1,1,1,1,0],
|
||
|
|
[0,0,0,1,0],
|
||
|
|
],
|
||
|
|
5: [
|
||
|
|
[1,1,1,0,0],
|
||
|
|
[1,0,0,1,0],
|
||
|
|
[1,1,1,1,0],
|
||
|
|
],
|
||
|
|
6: [
|
||
|
|
[1,1,1,0,0],
|
||
|
|
[1,0,0,1,0],
|
||
|
|
[1,1,1,1,0],
|
||
|
|
],
|
||
|
|
7: [
|
||
|
|
[0,1,1,1,0],
|
||
|
|
[0,0,0,1,0],
|
||
|
|
[0,0,0,1,0],
|
||
|
|
],
|
||
|
|
8: [
|
||
|
|
[1,1,1,0,0],
|
||
|
|
[1,0,0,1,0],
|
||
|
|
[1,1,1,0,0],
|
||
|
|
],
|
||
|
|
9: [
|
||
|
|
[1,1,1,0,0],
|
||
|
|
[1,0,0,1,0],
|
||
|
|
[1,1,0,1,0],
|
||
|
|
],
|
||
|
|
}
|
||
|
|
|
||
|
|
for digit_char in '0123450042':
|
||
|
|
d = int(digit_char)
|
||
|
|
digits[d].append([0]*5)
|
||
|
|
write_pixel_image_gif(os.path.join(outdir, f'counter_{digit_char}.gif'), digits[d], fg=(255, 255, 255), bg=(0, 0, 0))
|
||
|
|
print(f" OK counter_{digit_char}.gif")
|
||
|
|
created += 1
|
||
|
|
|
||
|
|
# ========== VISITOR COUNTER STRING ==========
|
||
|
|
# Make counter.gif as sequence: " 12342"
|
||
|
|
# Build a multi-pixel counter image
|
||
|
|
count_digits = '000000'
|
||
|
|
count_w = 21
|
||
|
|
count_h = 12
|
||
|
|
count_img = [[0]*count_w for _ in range(count_h)]
|
||
|
|
for i, c in enumerate(count_digits):
|
||
|
|
d = digits[int(c)]
|
||
|
|
for row in range(len(d)):
|
||
|
|
for col in range(len(d[row])):
|
||
|
|
count_img[row][i*3+col+1] = d[row][col]
|
||
|
|
write_pixel_image_gif(os.path.join(outdir, 'counter.gif'), count_img, fg=(255, 255, 150), bg=(0, 0, 0))
|
||
|
|
print(f" OK counter.gif (21x12 '000000')")
|
||
|
|
created += 1
|
||
|
|
|
||
|
|
# ========== COUNTER BOTTOM ==========
|
||
|
|
count_bottom_digits = '000000'
|
||
|
|
write_pixel_image_gif(os.path.join(outdir, 'counter_bottom.gif'), count_img, fg=(200, 200, 100), bg=(0, 0, 0))
|
||
|
|
print(f" OK counter_bottom.gif (21x12 '000000')")
|
||
|
|
created += 1
|
||
|
|
|
||
|
|
print(f"\nGenerated {created} GIFs in {outdir}/")
|
||
|
|
|
||
|
|
if __name__ == '__main__':
|
||
|
|
main()
|