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Diffstat (limited to 'env/lib/python3.10/site-packages/PIL/SgiImagePlugin.py')
| -rw-r--r-- | env/lib/python3.10/site-packages/PIL/SgiImagePlugin.py | 230 |
1 files changed, 0 insertions, 230 deletions
diff --git a/env/lib/python3.10/site-packages/PIL/SgiImagePlugin.py b/env/lib/python3.10/site-packages/PIL/SgiImagePlugin.py deleted file mode 100644 index f0207bb..0000000 --- a/env/lib/python3.10/site-packages/PIL/SgiImagePlugin.py +++ /dev/null @@ -1,230 +0,0 @@ -# -# The Python Imaging Library. -# $Id$ -# -# SGI image file handling -# -# See "The SGI Image File Format (Draft version 0.97)", Paul Haeberli. -# <ftp://ftp.sgi.com/graphics/SGIIMAGESPEC> -# -# -# History: -# 2017-22-07 mb Add RLE decompression -# 2016-16-10 mb Add save method without compression -# 1995-09-10 fl Created -# -# Copyright (c) 2016 by Mickael Bonfill. -# Copyright (c) 2008 by Karsten Hiddemann. -# Copyright (c) 1997 by Secret Labs AB. -# Copyright (c) 1995 by Fredrik Lundh. -# -# See the README file for information on usage and redistribution. -# - - -import os -import struct - -from . import Image, ImageFile -from ._binary import i16be as i16 -from ._binary import o8 - - -def _accept(prefix): - return len(prefix) >= 2 and i16(prefix) == 474 - - -MODES = { - (1, 1, 1): "L", - (1, 2, 1): "L", - (2, 1, 1): "L;16B", - (2, 2, 1): "L;16B", - (1, 3, 3): "RGB", - (2, 3, 3): "RGB;16B", - (1, 3, 4): "RGBA", - (2, 3, 4): "RGBA;16B", -} - - -## -# Image plugin for SGI images. -class SgiImageFile(ImageFile.ImageFile): - - format = "SGI" - format_description = "SGI Image File Format" - - def _open(self): - - # HEAD - headlen = 512 - s = self.fp.read(headlen) - - if not _accept(s): - raise ValueError("Not an SGI image file") - - # compression : verbatim or RLE - compression = s[2] - - # bpc : 1 or 2 bytes (8bits or 16bits) - bpc = s[3] - - # dimension : 1, 2 or 3 (depending on xsize, ysize and zsize) - dimension = i16(s, 4) - - # xsize : width - xsize = i16(s, 6) - - # ysize : height - ysize = i16(s, 8) - - # zsize : channels count - zsize = i16(s, 10) - - # layout - layout = bpc, dimension, zsize - - # determine mode from bits/zsize - rawmode = "" - try: - rawmode = MODES[layout] - except KeyError: - pass - - if rawmode == "": - raise ValueError("Unsupported SGI image mode") - - self._size = xsize, ysize - self.mode = rawmode.split(";")[0] - if self.mode == "RGB": - self.custom_mimetype = "image/rgb" - - # orientation -1 : scanlines begins at the bottom-left corner - orientation = -1 - - # decoder info - if compression == 0: - pagesize = xsize * ysize * bpc - if bpc == 2: - self.tile = [ - ("SGI16", (0, 0) + self.size, headlen, (self.mode, 0, orientation)) - ] - else: - self.tile = [] - offset = headlen - for layer in self.mode: - self.tile.append( - ("raw", (0, 0) + self.size, offset, (layer, 0, orientation)) - ) - offset += pagesize - elif compression == 1: - self.tile = [ - ("sgi_rle", (0, 0) + self.size, headlen, (rawmode, orientation, bpc)) - ] - - -def _save(im, fp, filename): - if im.mode != "RGB" and im.mode != "RGBA" and im.mode != "L": - raise ValueError("Unsupported SGI image mode") - - # Get the keyword arguments - info = im.encoderinfo - - # Byte-per-pixel precision, 1 = 8bits per pixel - bpc = info.get("bpc", 1) - - if bpc not in (1, 2): - raise ValueError("Unsupported number of bytes per pixel") - - # Flip the image, since the origin of SGI file is the bottom-left corner - orientation = -1 - # Define the file as SGI File Format - magic_number = 474 - # Run-Length Encoding Compression - Unsupported at this time - rle = 0 - - # Number of dimensions (x,y,z) - dim = 3 - # X Dimension = width / Y Dimension = height - x, y = im.size - if im.mode == "L" and y == 1: - dim = 1 - elif im.mode == "L": - dim = 2 - # Z Dimension: Number of channels - z = len(im.mode) - - if dim == 1 or dim == 2: - z = 1 - - # assert we've got the right number of bands. - if len(im.getbands()) != z: - raise ValueError( - f"incorrect number of bands in SGI write: {z} vs {len(im.getbands())}" - ) - - # Minimum Byte value - pinmin = 0 - # Maximum Byte value (255 = 8bits per pixel) - pinmax = 255 - # Image name (79 characters max, truncated below in write) - img_name = os.path.splitext(os.path.basename(filename))[0] - img_name = img_name.encode("ascii", "ignore") - # Standard representation of pixel in the file - colormap = 0 - fp.write(struct.pack(">h", magic_number)) - fp.write(o8(rle)) - fp.write(o8(bpc)) - fp.write(struct.pack(">H", dim)) - fp.write(struct.pack(">H", x)) - fp.write(struct.pack(">H", y)) - fp.write(struct.pack(">H", z)) - fp.write(struct.pack(">l", pinmin)) - fp.write(struct.pack(">l", pinmax)) - fp.write(struct.pack("4s", b"")) # dummy - fp.write(struct.pack("79s", img_name)) # truncates to 79 chars - fp.write(struct.pack("s", b"")) # force null byte after img_name - fp.write(struct.pack(">l", colormap)) - fp.write(struct.pack("404s", b"")) # dummy - - rawmode = "L" - if bpc == 2: - rawmode = "L;16B" - - for channel in im.split(): - fp.write(channel.tobytes("raw", rawmode, 0, orientation)) - - if hasattr(fp, "flush"): - fp.flush() - - -class SGI16Decoder(ImageFile.PyDecoder): - _pulls_fd = True - - def decode(self, buffer): - rawmode, stride, orientation = self.args - pagesize = self.state.xsize * self.state.ysize - zsize = len(self.mode) - self.fd.seek(512) - - for band in range(zsize): - channel = Image.new("L", (self.state.xsize, self.state.ysize)) - channel.frombytes( - self.fd.read(2 * pagesize), "raw", "L;16B", stride, orientation - ) - self.im.putband(channel.im, band) - - return -1, 0 - - -# -# registry - - -Image.register_decoder("SGI16", SGI16Decoder) -Image.register_open(SgiImageFile.format, SgiImageFile, _accept) -Image.register_save(SgiImageFile.format, _save) -Image.register_mime(SgiImageFile.format, "image/sgi") - -Image.register_extensions(SgiImageFile.format, [".bw", ".rgb", ".rgba", ".sgi"]) - -# End of file |