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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/SunImagePlugin.py
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+#
+# The Python Imaging Library.
+# $Id$
+#
+# Sun image file handling
+#
+# History:
+# 1995-09-10 fl Created
+# 1996-05-28 fl Fixed 32-bit alignment
+# 1998-12-29 fl Import ImagePalette module
+# 2001-12-18 fl Fixed palette loading (from Jean-Claude Rimbault)
+#
+# Copyright (c) 1997-2001 by Secret Labs AB
+# Copyright (c) 1995-1996 by Fredrik Lundh
+#
+# See the README file for information on usage and redistribution.
+#
+
+
+from . import Image, ImageFile, ImagePalette
+from ._binary import i32be as i32
+
+
+def _accept(prefix):
+ return len(prefix) >= 4 and i32(prefix) == 0x59A66A95
+
+
+##
+# Image plugin for Sun raster files.
+
+
+class SunImageFile(ImageFile.ImageFile):
+
+ format = "SUN"
+ format_description = "Sun Raster File"
+
+ def _open(self):
+
+ # The Sun Raster file header is 32 bytes in length
+ # and has the following format:
+
+ # typedef struct _SunRaster
+ # {
+ # DWORD MagicNumber; /* Magic (identification) number */
+ # DWORD Width; /* Width of image in pixels */
+ # DWORD Height; /* Height of image in pixels */
+ # DWORD Depth; /* Number of bits per pixel */
+ # DWORD Length; /* Size of image data in bytes */
+ # DWORD Type; /* Type of raster file */
+ # DWORD ColorMapType; /* Type of color map */
+ # DWORD ColorMapLength; /* Size of the color map in bytes */
+ # } SUNRASTER;
+
+ # HEAD
+ s = self.fp.read(32)
+ if not _accept(s):
+ raise SyntaxError("not an SUN raster file")
+
+ offset = 32
+
+ self._size = i32(s, 4), i32(s, 8)
+
+ depth = i32(s, 12)
+ # data_length = i32(s, 16) # unreliable, ignore.
+ file_type = i32(s, 20)
+ palette_type = i32(s, 24) # 0: None, 1: RGB, 2: Raw/arbitrary
+ palette_length = i32(s, 28)
+
+ if depth == 1:
+ self.mode, rawmode = "1", "1;I"
+ elif depth == 4:
+ self.mode, rawmode = "L", "L;4"
+ elif depth == 8:
+ self.mode = rawmode = "L"
+ elif depth == 24:
+ if file_type == 3:
+ self.mode, rawmode = "RGB", "RGB"
+ else:
+ self.mode, rawmode = "RGB", "BGR"
+ elif depth == 32:
+ if file_type == 3:
+ self.mode, rawmode = "RGB", "RGBX"
+ else:
+ self.mode, rawmode = "RGB", "BGRX"
+ else:
+ raise SyntaxError("Unsupported Mode/Bit Depth")
+
+ if palette_length:
+ if palette_length > 1024:
+ raise SyntaxError("Unsupported Color Palette Length")
+
+ if palette_type != 1:
+ raise SyntaxError("Unsupported Palette Type")
+
+ offset = offset + palette_length
+ self.palette = ImagePalette.raw("RGB;L", self.fp.read(palette_length))
+ if self.mode == "L":
+ self.mode = "P"
+ rawmode = rawmode.replace("L", "P")
+
+ # 16 bit boundaries on stride
+ stride = ((self.size[0] * depth + 15) // 16) * 2
+
+ # file type: Type is the version (or flavor) of the bitmap
+ # file. The following values are typically found in the Type
+ # field:
+ # 0000h Old
+ # 0001h Standard
+ # 0002h Byte-encoded
+ # 0003h RGB format
+ # 0004h TIFF format
+ # 0005h IFF format
+ # FFFFh Experimental
+
+ # Old and standard are the same, except for the length tag.
+ # byte-encoded is run-length-encoded
+ # RGB looks similar to standard, but RGB byte order
+ # TIFF and IFF mean that they were converted from T/IFF
+ # Experimental means that it's something else.
+ # (https://www.fileformat.info/format/sunraster/egff.htm)
+
+ if file_type in (0, 1, 3, 4, 5):
+ self.tile = [("raw", (0, 0) + self.size, offset, (rawmode, stride))]
+ elif file_type == 2:
+ self.tile = [("sun_rle", (0, 0) + self.size, offset, rawmode)]
+ else:
+ raise SyntaxError("Unsupported Sun Raster file type")
+
+
+#
+# registry
+
+
+Image.register_open(SunImageFile.format, SunImageFile, _accept)
+
+Image.register_extension(SunImageFile.format, ".ras")