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tools/png_to_nbpp: add support for 1bpp

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This commit is contained in:
Zack Buhman 2023-07-29 03:51:32 +00:00
parent ab4d133820
commit 1f80d22e72
1 changed files with 8 additions and 5 deletions
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11
tools/png_to_nbpp.py
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@ -6,13 +6,13 @@ from PIL import Image
from palette import intensity_to_index from palette import intensity_to_index
def convert(image, bpp): def convert(image, bpp):
assert bpp in {8, 4, 2}, bpp assert bpp in {8, 4, 2, 1}, bpp
px_per_byte = 8 // bpp px_per_byte = 8 // bpp
px_per_row = 8 px_per_row = 8
bits_per_byte = 8 bits_per_byte = 8
bytes_per_row = (px_per_row // (bits_per_byte // bpp)) bytes_per_row = (px_per_row // (bits_per_byte // bpp))
assert image.mode == 'L', image.mode assert image.mode in {'L', '1'}, image.mode
width, height = image.size width, height = image.size
buf = bytearray(width * height // px_per_byte) buf = bytearray(width * height // px_per_byte)
@ -21,14 +21,17 @@ def convert(image, bpp):
for cell_x in range(width//8): for cell_x in range(width//8):
for y in range(8): for y in range(8):
for x in range(8): for x in range(8):
px = im.getpixel((cell_x * 8 + x, cell_y * 8 + y)) px = image.getpixel((cell_x * 8 + x, cell_y * 8 + y))
if image.mode == 'L':
index = intensity_to_index(px) index = intensity_to_index(px)
elif image.mode == '1':
index = int(px != 0)
buf_ix = x//px_per_byte + (bytes_per_row * (cell_x * 8 + (cell_y * width) + y)) buf_ix = x//px_per_byte + (bytes_per_row * (cell_x * 8 + (cell_y * width) + y))
buf[buf_ix] |= (index << bpp * ((px_per_byte - 1) - (x % px_per_byte))) buf[buf_ix] |= (index << bpp * ((px_per_byte - 1) - (x % px_per_byte)))
return buf return buf
def debug(buf, bpp): def debug(buf, bpp):
assert bpp in {8, 4, 2}, bpp assert bpp in {8, 4, 2, 1}, bpp
px_per_byte = 8 // bpp px_per_byte = 8 // bpp
px_per_row = 8 px_per_row = 8
bits_per_byte = 8 bits_per_byte = 8