225 lines
9.3 KiB
Python
225 lines
9.3 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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__version__ = "1.0"
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from PIL import Image, ImageFile, _binary
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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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# so build a prototype image to be used for palette resampling
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def build_prototype_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 = ()
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for i in range(len(_Palm8BitColormapValues)):
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palettedata = palettedata + _Palm8BitColormapValues[i]
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for i in range(256 - len(_Palm8BitColormapValues)):
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palettedata = palettedata + (0, 0, 0)
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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, a "P"-mode image with the right palette
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#
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# --------------------------------------------------------------------
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_FLAGS = {
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"custom-colormap": 0x4000,
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"is-compressed": 0x8000,
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"has-transparent": 0x2000,
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}
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_COMPRESSION_TYPES = {
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"none": 0xFF,
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"rle": 0x01,
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"scanline": 0x00,
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}
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o8 = _binary.o8
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o16b = _binary.o16be
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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, fp, filename, check=0):
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if im.mode == "P":
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# we assume this is a color Palm image with the standard colormap,
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# unless the "info" dict has a "custom-colormap" field
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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" and "bpp" in im.encoderinfo and im.encoderinfo["bpp"] in (1, 2, 4):
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# this is 8-bit grayscale, so we shift it to get the high-order bits, and invert it because
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# Palm does greyscale from white (0) to black (1)
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bpp = im.encoderinfo["bpp"]
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im = im.point(lambda x, shift=8-bpp, maxval=(1 << bpp)-1: maxval - (x >> shift))
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# we ignore the palette here
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im.mode = "P"
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rawmode = "P;" + str(bpp)
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version = 1
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elif im.mode == "L" and "bpp" in im.info and im.info["bpp"] in (1, 2, 4):
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# here we assume that even though the inherent mode is 8-bit grayscale, only
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# the lower bpp bits are significant. We invert them to match the Palm.
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bpp = im.info["bpp"]
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im = im.point(lambda x, maxval=(1 << bpp)-1: maxval - (x & maxval))
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# we ignore the palette here
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im.mode = "P"
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rawmode = "P;" + str(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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raise IOError("cannot write mode %s as Palm" % im.mode)
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if check:
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return check
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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 = ((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" and "custom-colormap" in im.info:
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flags = flags & _FLAGS["custom-colormap"]
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colormapsize = 4 * 256 + 2
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colormapmode = im.palette.mode
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colormap = im.getdata().getpalette()
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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 > 0:
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fp.write(o16b(256))
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for i in range(256):
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fp.write(o8(i))
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if colormapmode == 'RGB':
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fp.write(o8(colormap[3 * i]) + o8(colormap[3 * i + 1]) + o8(colormap[3 * i + 2]))
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elif colormapmode == 'RGBA':
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fp.write(o8(colormap[4 * i]) + o8(colormap[4 * i + 1]) + o8(colormap[4 * i + 2]))
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# now convert data to raw form
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ImageFile._save(im, fp, [("raw", (0,0)+im.size, 0, (rawmode, rowbytes, 1))])
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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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