Source code for PIL.PalmImagePlugin

#
# The Python Imaging Library.
# $Id$
#

##
# Image plugin for Palm pixmap images (output only).
##

from . import Image, ImageFile
from ._binary import o8, o16be as o16b

__version__ = "1.0"

_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))


# so build a prototype image to be used for palette resampling
[docs]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" and "bpp" in im.encoderinfo and im.encoderinfo["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 greyscale 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)) # we ignore the palette here im.mode = "P" rawmode = "P;" + str(bpp) version = 1 elif im.mode == "L" and "bpp" in im.info and im.info["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)) # 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: raise IOError("cannot write mode %s as Palm" % im.mode) # # 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")