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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 __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 = [

ImageFile._Tile("raw", (0, 0) + self.size, offset, (rawmode, stride))

]

elif file_type == 2:

self.tile = [

ImageFile._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")