93 lines
2.7 KiB
Python
93 lines
2.7 KiB
Python
import struct
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import sys
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from PIL import Image
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class color_format:
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def gbgr1555(r, g, b, a): # nintendo ds
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r5 = (r >> 3) & 31
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g6 = (g >> 3) & 31
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g6_l = (g >> 2) & 1
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b5 = (b >> 3) & 31
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return (g6_l << 15) | (b5 << 10) | (g6 << 5) | (r5 << 0)
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def argb4444(r, g, b, a):
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a4 = (a >> 4) & 15
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r4 = (r >> 4) & 15
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g4 = (g >> 4) & 15
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b4 = (b >> 4) & 15
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return (a4 << 12) | (r4 << 8) | (g4 << 4) | (b4 << 0)
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def argb1555(r, g, b, a):
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a1 = (a >> 7) & 1
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r5 = (r >> 3) & 31
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g5 = (g >> 3) & 31
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b5 = (b >> 3) & 31
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return (a1 << 15) | (r5 << 10) | (g5 << 5) | (b5 << 0)
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def rgb565(r, g, b, a):
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r5 = (r >> 3) & 31
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g6 = (g >> 2) & 63
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b5 = (b >> 3) & 31
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return (r5 << 11) | (g5 << 5) | (b5 << 0)
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def from_string(s):
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return dict([
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("gbgr1555", color_format.gbgr1555),
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("argb4444", color_format.argb4444),
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("argb1555", color_format.argb1555),
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("rgb565", color_format.rgb565),
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])[s]
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in_file = sys.argv[1]
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format = sys.argv[2]
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out_file = sys.argv[3]
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palette = None
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with Image.open(in_file) as im:
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width, height = im.size
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if not im.palette:
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pixels = list(im.convert("RGBA").getdata())
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else:
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pixels = list(im.convert("P").getdata())
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palette = list(im.palette.colors)
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has_alpha = False
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convert = color_format.from_string(format)
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def convert_colors(f, colors):
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for color in colors:
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value = convert(*color)
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f.write(struct.pack("<H", value))
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if palette is None:
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with open(out_file, 'wb') as f:
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convert_colors(f, pixels)
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else:
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with open(out_file, 'wb') as f:
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if len(palette) <= 4:
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for i in range(len(pixels) // 4):
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a = pixels[i * 4 + 0]
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b = pixels[i * 4 + 1]
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c = pixels[i * 4 + 2]
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d = pixels[i * 4 + 3]
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assert a <= 3 and b <= 3 and c <= 3 and d <= 3, (a, b, c, d)
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pixel = (d << 6) | (c << 4) | (b << 2) | (a << 0)
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f.write(struct.pack("<B", pixel))
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elif len(palette) <= 16:
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for i in range(len(pixels) // 2):
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a = pixels[i * 2 + 0]
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b = pixels[i * 2 + 1]
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assert a <= 15 and b <= 15, (a, b)
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pixel = (b << 4) | (a << 0)
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f.write(struct.pack("<B", pixel))
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elif len(palette) <= 256:
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for pixel in pixels:
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assert pixel <= 255
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f.write(struct.pack("<B", pixel))
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else:
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assert False, len(palette)
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with open(out_file + '.pal', 'wb') as f:
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convert_colors(f, [(*c, 255) for c in palette])
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