# # The Python Imaging Library. # $Id: PalmImagePlugin.py 2438 2005-05-25 21:09:48Z Fredrik $ # ## # Image plugin for Palm pixmap images (output only). ## __version__ = "1.0" import Image, ImageFile import StringIO _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(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, } def o16b(i): return chr(i>>8&255) + chr(i&255) # # -------------------------------------------------------------------- ## # (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 im.encoderinfo.has_key("bpp") 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 im.info.has_key("bpp") 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 im.info.has_key("custom-colormap"): flags = flags & _FLAGS["custom-colormap"] colormapsize = 4 * 256 + 2; colormapmode = im.palette.mode colormap = im.getdata().getpalette() else: colormapsize = 0 if im.info.has_key("offset"): offset = (rowbytes * rows + 16 + 3 + colormapsize) / 4; else: offset = 0 fp.write(o16b(cols) + o16b(rows) + o16b(rowbytes) + o16b(flags)) fp.write(chr(bpp)) fp.write(chr(version)) fp.write(o16b(offset)) fp.write(chr(transparent_index)) fp.write(chr(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(chr(i)) if colormapmode == 'RGB': fp.write(chr(colormap[3 * i]) + chr(colormap[3 * i + 1]) + chr(colormap[3 * i + 2])) elif colormapmode == 'RGBA': fp.write(chr(colormap[4 * i]) + chr(colormap[4 * i + 1]) + chr(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")