# # The Python Imaging Library. # $Id: PalmImagePlugin.py,v 1.6 2004/03/16 14:45:25 prussar Exp $ # # Palm pixmap image handling # # __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 = { "is-compressed": 0x8000, "custom-colormap": 0x4000, "has-transparent": 0x2000, "indirect": 0x1000, "forScreen": 0x0800, "directColor": 0x0400, "fourByteField": 0x0200 } _COMPRESSION_TYPES = { "none": 0xFF, "rle": 0x01, "scanline": 0x00, } def o16b(i): return chr(i>>8&255) + chr(i&255) def reduce_rgb(pixel): # maps RGB pixel to Palm 16-bit direct color (5:6:5) return (((pixel[0] >> 3) << 11) | ((pixel[1] >> 2) << 5) | (pixel[2] >> 3)) # # -------------------------------------------------------------------- def _save(im, fp, filename, check=0): if im.mode == 'RGB': # we assume that this is to be converted to the Palm 16-bit directcolor # format, which has 5 bits of red, 6 bits of green, and 5 bits of blue pixels = im.getdata() monochrome = 1 for p in pixels: if p != (255,255,255) and p != (0,0,0): monochrome = 0 break if monochrome: im = im.convert('1') rawmode = '1;I' bpp = 1 version = 1 else: newpixels = map(reduce_rgb, pixels) im = Image.new('I', im.size, 1) im.load() index = 0 for y in range(im.size[1]): for x in range(im.size[0]): im.putpixel((x,y), newpixels[index]) index = index + 1 rawmode = 'I;16B' bpp = 16 version = 2 elif im.mode == "P": # we assume this is a color Palm image with the standard colormap, # unless the "info" dict has a "custom-colormap" field # FIXME: Fails if 0 and 255 are remapped in a custom way. monochrome = 1 if im.info.has_key("custom-colormap"): monochrome = 0 else: for p in im.getdata(): c = _Palm8BitColormapValues[ p ]; if c != (255,255,255) and c != (0,0,0): monochrome = 0 break if monochrome: im = im.convert('1') rawmode = '1;I' bpp = 1 version = 1 else: 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) monochrome = 1 for p in im.getdata(): if p != 0 and p != 255: monochrome = 0 break if monochrome: im = im.convert('1') rawmode = '1;I' bpp = 1 version = 1 else: 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. maxval = (1 << bpp)-1 pixels = im.getdata() monochrome = 1 for p in pixels: if (p&maxval) != 0 and (p&maxval) != maxval: monochrome = 0 break if monochrome: im = Image.new('1', im.size, 1) im.load() index = 0 for y in range(im.size[1]): for x in range(im.size[0]): if ( pixels[index] == maxval ): value = 1 else: value = 0 im.putpixel((x,y), value) index = index + 1 rawmode = '1;I' bpp = 1 version = 1 else: bpp = im.info["bpp"] im = im.point(lambda x: 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 rawmode == 'I;16B': flags = flags | _FLAGS["directColor"] 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])) # if directColor, write out bpp info if rawmode == 'I;16B': fp.write(chr(5) + chr(6) + chr(5) + chr(0)) # now write out the transparent color fp.write(chr(0) + chr(0) + chr(0) + chr(0)) # 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")