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