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218 lines
8.5 KiB
Python
218 lines
8.5 KiB
Python
#
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# The Python Imaging Library.
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# $Id$
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#
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##
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# Image plugin for Palm pixmap images (output only).
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##
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from __future__ import annotations
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from typing import IO
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from . import Image, ImageFile
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from ._binary import o8
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from ._binary import o16be as o16b
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# fmt: off
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_Palm8BitColormapValues = (
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(255, 255, 255), (255, 204, 255), (255, 153, 255), (255, 102, 255),
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(255, 51, 255), (255, 0, 255), (255, 255, 204), (255, 204, 204),
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(255, 153, 204), (255, 102, 204), (255, 51, 204), (255, 0, 204),
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(255, 255, 153), (255, 204, 153), (255, 153, 153), (255, 102, 153),
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(255, 51, 153), (255, 0, 153), (204, 255, 255), (204, 204, 255),
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(204, 153, 255), (204, 102, 255), (204, 51, 255), (204, 0, 255),
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(204, 255, 204), (204, 204, 204), (204, 153, 204), (204, 102, 204),
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(204, 51, 204), (204, 0, 204), (204, 255, 153), (204, 204, 153),
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(204, 153, 153), (204, 102, 153), (204, 51, 153), (204, 0, 153),
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(153, 255, 255), (153, 204, 255), (153, 153, 255), (153, 102, 255),
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(153, 51, 255), (153, 0, 255), (153, 255, 204), (153, 204, 204),
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(153, 153, 204), (153, 102, 204), (153, 51, 204), (153, 0, 204),
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(153, 255, 153), (153, 204, 153), (153, 153, 153), (153, 102, 153),
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(153, 51, 153), (153, 0, 153), (102, 255, 255), (102, 204, 255),
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(102, 153, 255), (102, 102, 255), (102, 51, 255), (102, 0, 255),
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(102, 255, 204), (102, 204, 204), (102, 153, 204), (102, 102, 204),
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(102, 51, 204), (102, 0, 204), (102, 255, 153), (102, 204, 153),
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(102, 153, 153), (102, 102, 153), (102, 51, 153), (102, 0, 153),
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(51, 255, 255), (51, 204, 255), (51, 153, 255), (51, 102, 255),
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(51, 51, 255), (51, 0, 255), (51, 255, 204), (51, 204, 204),
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(51, 153, 204), (51, 102, 204), (51, 51, 204), (51, 0, 204),
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(51, 255, 153), (51, 204, 153), (51, 153, 153), (51, 102, 153),
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(51, 51, 153), (51, 0, 153), (0, 255, 255), (0, 204, 255),
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(0, 153, 255), (0, 102, 255), (0, 51, 255), (0, 0, 255),
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(0, 255, 204), (0, 204, 204), (0, 153, 204), (0, 102, 204),
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(0, 51, 204), (0, 0, 204), (0, 255, 153), (0, 204, 153),
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(0, 153, 153), (0, 102, 153), (0, 51, 153), (0, 0, 153),
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(255, 255, 102), (255, 204, 102), (255, 153, 102), (255, 102, 102),
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(255, 51, 102), (255, 0, 102), (255, 255, 51), (255, 204, 51),
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(255, 153, 51), (255, 102, 51), (255, 51, 51), (255, 0, 51),
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(255, 255, 0), (255, 204, 0), (255, 153, 0), (255, 102, 0),
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(255, 51, 0), (255, 0, 0), (204, 255, 102), (204, 204, 102),
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(204, 153, 102), (204, 102, 102), (204, 51, 102), (204, 0, 102),
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(204, 255, 51), (204, 204, 51), (204, 153, 51), (204, 102, 51),
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(204, 51, 51), (204, 0, 51), (204, 255, 0), (204, 204, 0),
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(204, 153, 0), (204, 102, 0), (204, 51, 0), (204, 0, 0),
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(153, 255, 102), (153, 204, 102), (153, 153, 102), (153, 102, 102),
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(153, 51, 102), (153, 0, 102), (153, 255, 51), (153, 204, 51),
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(153, 153, 51), (153, 102, 51), (153, 51, 51), (153, 0, 51),
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(153, 255, 0), (153, 204, 0), (153, 153, 0), (153, 102, 0),
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(153, 51, 0), (153, 0, 0), (102, 255, 102), (102, 204, 102),
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(102, 153, 102), (102, 102, 102), (102, 51, 102), (102, 0, 102),
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(102, 255, 51), (102, 204, 51), (102, 153, 51), (102, 102, 51),
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(102, 51, 51), (102, 0, 51), (102, 255, 0), (102, 204, 0),
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(102, 153, 0), (102, 102, 0), (102, 51, 0), (102, 0, 0),
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(51, 255, 102), (51, 204, 102), (51, 153, 102), (51, 102, 102),
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(51, 51, 102), (51, 0, 102), (51, 255, 51), (51, 204, 51),
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(51, 153, 51), (51, 102, 51), (51, 51, 51), (51, 0, 51),
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(51, 255, 0), (51, 204, 0), (51, 153, 0), (51, 102, 0),
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(51, 51, 0), (51, 0, 0), (0, 255, 102), (0, 204, 102),
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(0, 153, 102), (0, 102, 102), (0, 51, 102), (0, 0, 102),
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(0, 255, 51), (0, 204, 51), (0, 153, 51), (0, 102, 51),
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(0, 51, 51), (0, 0, 51), (0, 255, 0), (0, 204, 0),
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(0, 153, 0), (0, 102, 0), (0, 51, 0), (17, 17, 17),
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(34, 34, 34), (68, 68, 68), (85, 85, 85), (119, 119, 119),
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(136, 136, 136), (170, 170, 170), (187, 187, 187), (221, 221, 221),
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(238, 238, 238), (192, 192, 192), (128, 0, 0), (128, 0, 128),
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(0, 128, 0), (0, 128, 128), (0, 0, 0), (0, 0, 0),
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(0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0),
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(0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0),
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(0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0),
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(0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0),
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(0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0),
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(0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0))
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# fmt: on
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# so build a prototype image to be used for palette resampling
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def build_prototype_image() -> Image.Image:
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image = Image.new("L", (1, len(_Palm8BitColormapValues)))
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image.putdata(list(range(len(_Palm8BitColormapValues))))
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palettedata: tuple[int, ...] = ()
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for colormapValue in _Palm8BitColormapValues:
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palettedata += colormapValue
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palettedata += (0, 0, 0) * (256 - len(_Palm8BitColormapValues))
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image.putpalette(palettedata)
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return image
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Palm8BitColormapImage = build_prototype_image()
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# OK, we now have in Palm8BitColormapImage,
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# a "P"-mode image with the right palette
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#
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# --------------------------------------------------------------------
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_FLAGS = {"custom-colormap": 0x4000, "is-compressed": 0x8000, "has-transparent": 0x2000}
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_COMPRESSION_TYPES = {"none": 0xFF, "rle": 0x01, "scanline": 0x00}
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#
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# --------------------------------------------------------------------
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##
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# (Internal) Image save plugin for the Palm format.
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def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
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if im.mode == "P":
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rawmode = "P"
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bpp = 8
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version = 1
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elif im.mode == "L":
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if im.encoderinfo.get("bpp") in (1, 2, 4):
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# this is 8-bit grayscale, so we shift it to get the high-order bits,
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# and invert it because
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# Palm does grayscale from white (0) to black (1)
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bpp = im.encoderinfo["bpp"]
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maxval = (1 << bpp) - 1
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shift = 8 - bpp
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im = im.point(lambda x: maxval - (x >> shift))
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elif im.info.get("bpp") in (1, 2, 4):
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# here we assume that even though the inherent mode is 8-bit grayscale,
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# only the lower bpp bits are significant.
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# We invert them to match the Palm.
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bpp = im.info["bpp"]
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maxval = (1 << bpp) - 1
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im = im.point(lambda x: maxval - (x & maxval))
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else:
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msg = f"cannot write mode {im.mode} as Palm"
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raise OSError(msg)
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# we ignore the palette here
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im._mode = "P"
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rawmode = f"P;{bpp}"
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version = 1
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elif im.mode == "1":
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# monochrome -- write it inverted, as is the Palm standard
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rawmode = "1;I"
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bpp = 1
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version = 0
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else:
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msg = f"cannot write mode {im.mode} as Palm"
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raise OSError(msg)
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#
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# make sure image data is available
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im.load()
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# write header
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cols = im.size[0]
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rows = im.size[1]
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rowbytes = int((cols + (16 // bpp - 1)) / (16 // bpp)) * 2
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transparent_index = 0
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compression_type = _COMPRESSION_TYPES["none"]
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flags = 0
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if im.mode == "P":
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flags |= _FLAGS["custom-colormap"]
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colormap = im.im.getpalette()
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colors = len(colormap) // 3
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colormapsize = 4 * colors + 2
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else:
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colormapsize = 0
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if "offset" in im.info:
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offset = (rowbytes * rows + 16 + 3 + colormapsize) // 4
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else:
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offset = 0
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fp.write(o16b(cols) + o16b(rows) + o16b(rowbytes) + o16b(flags))
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fp.write(o8(bpp))
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fp.write(o8(version))
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fp.write(o16b(offset))
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fp.write(o8(transparent_index))
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fp.write(o8(compression_type))
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fp.write(o16b(0)) # reserved by Palm
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# now write colormap if necessary
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if colormapsize:
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fp.write(o16b(colors))
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for i in range(colors):
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fp.write(o8(i))
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fp.write(colormap[3 * i : 3 * i + 3])
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# now convert data to raw form
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ImageFile._save(
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im, fp, [ImageFile._Tile("raw", (0, 0) + im.size, 0, (rawmode, rowbytes, 1))]
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)
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if hasattr(fp, "flush"):
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fp.flush()
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#
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# --------------------------------------------------------------------
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Image.register_save("Palm", _save)
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Image.register_extension("Palm", ".palm")
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Image.register_mime("Palm", "image/palm")
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