Source code for PIL.SunImagePlugin

#
# 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

__version__ = "0.3"


def _accept(prefix):
    return len(prefix) >= 4 and i32(prefix) == 0x59a66a95


##
# Image plugin for Sun raster files.

[docs]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 i32(s) != 0x59a66a95: raise SyntaxError("not an SUN raster file") offset = 32 self._size = i32(s[4:8]), i32(s[8:12]) depth = i32(s[12:16]) # data_length = i32(s[16:20]) # unreliable, ignore. file_type = i32(s[20:24]) palette_type = i32(s[24:28]) # 0: None, 1: RGB, 2: Raw/arbitrary palette_length = i32(s[28:32]) 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")