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Pillow/PIL/PalmImagePlugin.py

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#
# The Python Imaging Library.
# $Id$
#
##
# Image plugin for Palm pixmap images (output only).
##
__version__ = "1.0"
from PIL import Image, ImageFile, _binary
_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 i in range(len(_Palm8BitColormapValues)):
palettedata = palettedata + _Palm8BitColormapValues[i]
for i in range(256 - len(_Palm8BitColormapValues)):
palettedata = palettedata + (0, 0, 0)
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,
}
o8 = _binary.o8
o16b = _binary.o16be
#
# --------------------------------------------------------------------
##
# (Internal) Image save plugin for the Palm format.
def _save(im, fp, filename, check=0):
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)
if check:
return check
#
# make sure image data is available
im.load()
# write header
cols = im.size[0]
rows = im.size[1]
rowbytes = ((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))])
fp.flush()
#
# --------------------------------------------------------------------
Image.register_save("Palm", _save)
Image.register_extension("Palm", ".palm")
Image.register_mime("Palm", "image/palm")
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