2021-11-20 21:13:45 -05:00
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import ulab.numpy as np
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import displayio
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import bitmaptools
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2023-08-22 11:15:46 -04:00
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import struct
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2021-11-20 21:13:45 -05:00
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base_header = b"BMFX\x02\x00\x00\x00\x00\x00F\x00\x00\x008\x00\x00\x00@\x01\x00\x00\xf0\x00\x00\x00\x01\x00\x10\x00\x03\x00\x00\x00\x00X\x02\x00\xd7\r\x00\x00\xd7\r\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xf8\x00\x00\xe0\x07\x00\x00\x1f\x00\x00\x00\x00\x00\x00\x00"
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def writebmp16(filename, bitmap):
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header = bytearray(base_header)
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header[18:26] = struct.pack("<II", bitmap.width, bitmap.height)
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with open(filename, "wb") as f:
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f.write(header)
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b = np.frombuffer(bitmap, dtype=np.uint16)
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for i in range(bitmap.height):
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j = (bitmap.height - i - 1) * bitmap.width
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f.write(b[j : j + bitmap.width])
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def loadbmp16(filename, width=320, height=240):
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"""This specialized routine loads 16bpp uncompressed bmp files with a
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70-byte header. It is not appropriate for generic bmp files."""
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bitmap = displayio.Bitmap(width, height, 65536)
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with open(filename, "rb") as f:
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f.seek(70)
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bitmaptools.readinto(
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bitmap,
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f,
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bits_per_pixel=16,
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element_size=2,
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reverse_rows=True,
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)
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return bitmap
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if __name__ == "__main__":
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if "/" in __file__:
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here = __file__.rsplit("/", 1)[0]
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else:
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here = "."
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b = loadbmp16(here + "/minerva16.bmp")
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print(b[0, 0])
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print(b[160, 160])
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for i, p in enumerate(sorted(set(memoryview(b)))):
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print("%04x" % p, end="\n" if (i % 8) == 7 else " ")
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if i % 8 != 7:
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print()
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