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