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- #
- # 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
- 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")
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