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