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authorLibravatarLibravatar Biswakalyan Bhuyan <biswa@surgot.in> 2022-11-13 23:46:45 +0530
committerLibravatarLibravatar Biswakalyan Bhuyan <biswa@surgot.in> 2022-11-13 23:46:45 +0530
commit9468226a9e2e2ab8cdd599f1d8538e860ca86120 (patch)
tree0a77ada226d6db80639f96b438bf83e4e756edb5 /env/lib/python3.10/site-packages/PIL/TgaImagePlugin.py
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Diffstat (limited to 'env/lib/python3.10/site-packages/PIL/TgaImagePlugin.py')
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diff --git a/env/lib/python3.10/site-packages/PIL/TgaImagePlugin.py b/env/lib/python3.10/site-packages/PIL/TgaImagePlugin.py
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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 i16le as i16
+from ._binary import o8
+from ._binary import 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 = s[0]
+
+ colormaptype = s[1]
+ imagetype = s[2]
+
+ depth = s[16]
+
+ flags = 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
+ self._flip_horizontally = orientation in [0x10, 0x30]
+ if orientation in [0x20, 0x30]:
+ orientation = 1
+ elif orientation in [0, 0x10]:
+ 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), s[7]
+ if mapdepth == 16:
+ self.palette = ImagePalette.raw(
+ "BGR;15", 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
+
+ def load_end(self):
+ if self._flip_horizontally:
+ self.im = self.im.transpose(Image.Transpose.FLIP_LEFT_RIGHT)
+
+
+#
+# --------------------------------------------------------------------
+# 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 as e:
+ raise OSError(f"cannot write mode {im.mode} as TGA") from e
+
+ 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:
+ palette = im.im.getpalette("RGB", "BGR")
+ colormaplength, colormapentry = len(palette) // 3, 24
+ else:
+ colormaplength, colormapentry = 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(0) # 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(palette)
+
+ 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")