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# # The Python Imaging Library. # $Id$ # # TGA file handling # # History: # 95-09-01 fl created (reads 24-bit files only) # 97-01-04 fl support more TGA versions, including compressed images # 98-07-04 fl fixed orientation and alpha layer bugs # 98-09-11 fl fixed orientation for runlength decoder # # Copyright (c) Secret Labs AB 1997-98. # Copyright (c) Fredrik Lundh 1995-97. # # See the README file for information on usage and redistribution. # import warnings from . import Image, ImageFile, ImagePalette from ._binary import i8, i16le as i16, o8, o16le as o16 # # -------------------------------------------------------------------- # Read RGA file MODES = { # map imagetype/depth to rawmode (1, 8): "P", (3, 1): "1", (3, 8): "L", (3, 16): "LA", (2, 16): "BGR;5", (2, 24): "BGR", (2, 32): "BGRA", } ## # Image plugin for Targa files. class TgaImageFile(ImageFile.ImageFile): format = "TGA" format_description = "Targa" def _open(self): # process header s = self.fp.read(18) id_len = i8(s[0]) colormaptype = i8(s[1]) imagetype = i8(s[2]) depth = i8(s[16]) flags = i8(s[17]) self._size = i16(s[12:]), i16(s[14:]) # validate header fields if ( colormaptype not in (0, 1) or self.size[0] <= 0 or self.size[1] <= 0 or depth not in (1, 8, 16, 24, 32) ): raise SyntaxError("not a TGA file") # image mode if imagetype in (3, 11): self.mode = "L" if depth == 1: self.mode = "1" # ??? elif depth == 16: self.mode = "LA" elif imagetype in (1, 9): self.mode = "P" elif imagetype in (2, 10): self.mode = "RGB" if depth == 32: self.mode = "RGBA" else: raise SyntaxError("unknown TGA mode") # orientation orientation = flags & 0x30 if orientation == 0x20: orientation = 1 elif not orientation: orientation = -1 else: raise SyntaxError("unknown TGA orientation") self.info["orientation"] = orientation if imagetype & 8: self.info["compression"] = "tga_rle" if id_len: self.info["id_section"] = self.fp.read(id_len) if colormaptype: # read palette start, size, mapdepth = i16(s[3:]), i16(s[5:]), i16(s[7:]) if mapdepth == 16: self.palette = ImagePalette.raw( "BGR;16", b"\0" * 2 * start + self.fp.read(2 * size) ) elif mapdepth == 24: self.palette = ImagePalette.raw( "BGR", b"\0" * 3 * start + self.fp.read(3 * size) ) elif mapdepth == 32: self.palette = ImagePalette.raw( "BGRA", b"\0" * 4 * start + self.fp.read(4 * size) ) # setup tile descriptor try: rawmode = MODES[(imagetype & 7, depth)] if imagetype & 8: # compressed self.tile = [ ( "tga_rle", (0, 0) + self.size, self.fp.tell(), (rawmode, orientation, depth), ) ] else: self.tile = [ ( "raw", (0, 0) + self.size, self.fp.tell(), (rawmode, 0, orientation), ) ] except KeyError: pass # cannot decode # # -------------------------------------------------------------------- # Write TGA file SAVE = { "1": ("1", 1, 0, 3), "L": ("L", 8, 0, 3), "LA": ("LA", 16, 0, 3), "P": ("P", 8, 1, 1), "RGB": ("BGR", 24, 0, 2), "RGBA": ("BGRA", 32, 0, 2), } def _save(im, fp, filename): try: rawmode, bits, colormaptype, imagetype = SAVE[im.mode] except KeyError: raise OSError("cannot write mode %s as TGA" % im.mode) if "rle" in im.encoderinfo: rle = im.encoderinfo["rle"] else: compression = im.encoderinfo.get("compression", im.info.get("compression")) rle = compression == "tga_rle" if rle: imagetype += 8 id_section = im.encoderinfo.get("id_section", im.info.get("id_section", "")) id_len = len(id_section) if id_len > 255: id_len = 255 id_section = id_section[:255] warnings.warn("id_section has been trimmed to 255 characters") if colormaptype: colormapfirst, colormaplength, colormapentry = 0, 256, 24 else: colormapfirst, colormaplength, colormapentry = 0, 0, 0 if im.mode in ("LA", "RGBA"): flags = 8 else: flags = 0 orientation = im.encoderinfo.get("orientation", im.info.get("orientation", -1)) if orientation > 0: flags = flags | 0x20 fp.write( o8(id_len) + o8(colormaptype) + o8(imagetype) + o16(colormapfirst) + o16(colormaplength) + o8(colormapentry) + o16(0) + o16(0) + o16(im.size[0]) + o16(im.size[1]) + o8(bits) + o8(flags) ) if id_section: fp.write(id_section) if colormaptype: fp.write(im.im.getpalette("RGB", "BGR")) if rle: ImageFile._save( im, fp, [("tga_rle", (0, 0) + im.size, 0, (rawmode, orientation))] ) else: ImageFile._save( im, fp, [("raw", (0, 0) + im.size, 0, (rawmode, 0, orientation))] ) # write targa version 2 footer fp.write(b"\000" * 8 + b"TRUEVISION-XFILE." + b"\000") # # -------------------------------------------------------------------- # Registry Image.register_open(TgaImageFile.format, TgaImageFile) Image.register_save(TgaImageFile.format, _save) Image.register_extensions(TgaImageFile.format, [".tga", ".icb", ".vda", ".vst"]) Image.register_mime(TgaImageFile.format, "image/x-tga")