142 lines
4.4 KiB
Python
142 lines
4.4 KiB
Python
#
|
|
# 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 __future__ import annotations
|
|
|
|
from . import Image, ImageFile, ImagePalette
|
|
from ._binary import i32be as i32
|
|
|
|
|
|
def _accept(prefix: bytes) -> bool:
|
|
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) -> None:
|
|
# 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;
|
|
|
|
assert self.fp is not None
|
|
|
|
# HEAD
|
|
s = self.fp.read(32)
|
|
if not _accept(s):
|
|
msg = "not an SUN raster file"
|
|
raise SyntaxError(msg)
|
|
|
|
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:
|
|
msg = "Unsupported Mode/Bit Depth"
|
|
raise SyntaxError(msg)
|
|
|
|
if palette_length:
|
|
if palette_length > 1024:
|
|
msg = "Unsupported Color Palette Length"
|
|
raise SyntaxError(msg)
|
|
|
|
if palette_type != 1:
|
|
msg = "Unsupported Palette Type"
|
|
raise SyntaxError(msg)
|
|
|
|
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:
|
|
msg = "Unsupported Sun Raster file type"
|
|
raise SyntaxError(msg)
|
|
|
|
|
|
#
|
|
# registry
|
|
|
|
|
|
Image.register_open(SunImageFile.format, SunImageFile, _accept)
|
|
|
|
Image.register_extension(SunImageFile.format, ".ras")
|