360 lines
12 KiB
Python
360 lines
12 KiB
Python
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# ----------------------------------------------------------------------------
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# pyglet
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# Copyright (c) 2006-2008 Alex Holkner
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of pyglet nor the names of its
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# contributors may be used to endorse or promote products
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# derived from this software without specific prior written
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# permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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# ----------------------------------------------------------------------------
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'''Decoder for BMP files.
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Currently supports version 3 and 4 bitmaps with BI_RGB and BI_BITFIELDS
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encoding. Alpha channel is supported for 32-bit BI_RGB only.
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'''
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# Official docs are at
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# http://msdn2.microsoft.com/en-us/library/ms532311.aspx
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#
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# But some details including alignment and bit/byte order are omitted; see
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# http://www.fileformat.info/format/bmp/egff.htm
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__docformat__ = 'restructuredtext'
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__version__ = '$Id: bmp.py 2019 2008-04-18 14:30:48Z Alex.Holkner $'
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import ctypes
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from pyglet.image import ImageData
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from pyglet.image.codecs import ImageDecoder, ImageDecodeException
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BYTE = ctypes.c_ubyte
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WORD = ctypes.c_uint16
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DWORD = ctypes.c_uint32
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LONG = ctypes.c_int32
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FXPT2DOT30 = ctypes.c_uint32
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BI_RGB = 0
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BI_RLE8 = 1
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BI_RLE4 = 2
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BI_BITFIELDS = 3
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class BITMAPFILEHEADER(ctypes.LittleEndianStructure):
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_pack_ = 1
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_fields_ = [
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('bfType', WORD),
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('bfSize', DWORD),
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('bfReserved1', WORD),
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('bfReserved2', WORD),
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('bfOffBits', DWORD)
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]
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class BITMAPINFOHEADER(ctypes.LittleEndianStructure):
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_pack_ = 1
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_fields_ = [
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('biSize', DWORD),
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('biWidth', LONG),
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('biHeight', LONG),
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('biPlanes', WORD),
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('biBitCount', WORD),
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('biCompression', DWORD),
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('biSizeImage', DWORD),
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('biXPelsPerMeter', LONG),
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('biYPelsPerMeter', LONG),
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('biClrUsed', DWORD),
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('biClrImportant', DWORD)
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]
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CIEXYZTRIPLE = FXPT2DOT30 * 9
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class BITMAPV4HEADER(ctypes.LittleEndianStructure):
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_pack_ = 1
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_fields_ = [
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('biSize', DWORD),
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('biWidth', LONG),
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('biHeight', LONG),
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('biPlanes', WORD),
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('biBitCount', WORD),
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('biCompression', DWORD),
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('biSizeImage', DWORD),
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('biXPelsPerMeter', LONG),
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('biYPelsPerMeter', LONG),
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('biClrUsed', DWORD),
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('biClrImportant', DWORD),
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('bV4RedMask', DWORD),
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('bV4GreenMask', DWORD),
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('bV4BlueMask', DWORD),
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('bV4AlphaMask', DWORD),
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('bV4CSType', DWORD),
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('bV4Endpoints', CIEXYZTRIPLE),
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('bV4GammaRed', DWORD),
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('bV4GammaGreen', DWORD),
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('bV4GammaBlue', DWORD),
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]
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class RGBFields(ctypes.LittleEndianStructure):
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_pack_ = 1
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_fields_ = [
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('red', DWORD),
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('green', DWORD),
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('blue', DWORD),
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]
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class RGBQUAD(ctypes.LittleEndianStructure):
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_pack_ = 1
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_fields_ = [
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('rgbBlue', BYTE),
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('rgbGreen', BYTE),
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('rgbRed', BYTE),
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('rgbReserved', BYTE)
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]
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def __repr__(self):
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return '<%d, %d, %d>' % (self.rgbRed, self.rgbGreen, self.rgbBlue)
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def ptr_add(ptr, offset):
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address = ctypes.addressof(ptr.contents) + offset
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return ctypes.pointer(type(ptr.contents).from_address(address))
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def to_ctypes(buffer, offset, type):
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if offset + ctypes.sizeof(type) > len(buffer):
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raise ImageDecodeException('BMP file is truncated')
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ptr = ptr_add(ctypes.pointer(buffer), offset)
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return ctypes.cast(ptr, ctypes.POINTER(type)).contents
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class BMPImageDecoder(ImageDecoder):
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def get_file_extensions(self):
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return ['.bmp']
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def decode(self, file, filename):
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if not file:
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file = open(filename, 'rb')
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bytes = file.read()
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buffer = ctypes.c_buffer(bytes)
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if bytes[:2] != 'BM':
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raise ImageDecodeException(
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'Not a Windows bitmap file: %r' % (filename or file))
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file_header = to_ctypes(buffer, 0, BITMAPFILEHEADER)
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bits_offset = file_header.bfOffBits
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info_header_offset = ctypes.sizeof(BITMAPFILEHEADER)
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info_header = to_ctypes(buffer, info_header_offset, BITMAPINFOHEADER)
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palette_offset = info_header_offset + info_header.biSize
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if info_header.biSize < ctypes.sizeof(BITMAPINFOHEADER):
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raise ImageDecodeException(
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'Unsupported BMP type: %r' % (filename or file))
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width = info_header.biWidth
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height = info_header.biHeight
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if width <= 0 or info_header.biPlanes != 1:
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raise ImageDecodeException(
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'BMP file has corrupt parameters: %r' % (filename or file))
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pitch_sign = height < 0 and -1 or 1
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height = abs(height)
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compression = info_header.biCompression
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if compression not in (BI_RGB, BI_BITFIELDS):
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raise ImageDecodeException(
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'Unsupported compression: %r' % (filename or file))
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clr_used = 0
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bitcount = info_header.biBitCount
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if bitcount == 1:
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pitch = (width + 7) // 8
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bits_type = ctypes.c_ubyte
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decoder = decode_1bit
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elif bitcount == 4:
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pitch = (width + 1) // 2
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bits_type = ctypes.c_ubyte
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decoder = decode_4bit
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elif bitcount == 8:
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bits_type = ctypes.c_ubyte
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pitch = width
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decoder = decode_8bit
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elif bitcount == 16:
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pitch = width * 2
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bits_type = ctypes.c_uint16
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decoder = decode_bitfields
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elif bitcount == 24:
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pitch = width * 3
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bits_type = ctypes.c_ubyte
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decoder = decode_24bit
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elif bitcount == 32:
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pitch = width * 4
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if compression == BI_RGB:
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decoder = decode_32bit_rgb
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bits_type = ctypes.c_ubyte
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elif compression == BI_BITFIELDS:
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decoder = decode_bitfields
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bits_type = ctypes.c_uint32
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else:
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raise ImageDecodeException(
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'Unsupported compression: %r' % (filename or file))
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else:
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raise ImageDecodeException(
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'Unsupported bit count %d: %r' % (bitcount, filename or file))
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pitch = (pitch + 3) & ~3
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packed_width = pitch // ctypes.sizeof(bits_type)
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if bitcount < 16 and compression == BI_RGB:
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clr_used = info_header.biClrUsed or (1 << bitcount)
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palette = to_ctypes(buffer, palette_offset, RGBQUAD * clr_used)
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bits = to_ctypes(buffer, bits_offset,
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bits_type * packed_width * height)
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return decoder(bits, palette, width, height, pitch, pitch_sign)
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elif bitcount >= 16 and compression == BI_RGB:
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bits = to_ctypes(buffer, bits_offset,
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bits_type * (packed_width * height))
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return decoder(bits, None, width, height, pitch, pitch_sign)
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elif compression == BI_BITFIELDS:
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if info_header.biSize >= ctypes.sizeof(BITMAPV4HEADER):
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info_header = to_ctypes(buffer, info_header_offset,
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BITMAPV4HEADER)
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r_mask = info_header.bV4RedMask
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g_mask = info_header.bV4GreenMask
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b_mask = info_header.bV4BlueMask
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else:
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fields_offset = info_header_offset + \
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ctypes.sizeof(BITMAPINFOHEADER)
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fields = to_ctypes(buffer, fields_offset, RGBFields)
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r_mask = fields.red
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g_mask = fields.green
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b_mask = fields.blue
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class _BitsArray(ctypes.LittleEndianStructure):
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_pack_ = 1
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_fields_ = [
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('data', bits_type * packed_width * height),
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]
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bits = to_ctypes(buffer, bits_offset, _BitsArray).data
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return decoder(bits, r_mask, g_mask, b_mask,
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width, height, pitch, pitch_sign)
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def decode_1bit(bits, palette, width, height, pitch, pitch_sign):
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rgb_pitch = (((pitch << 3) + 7) & ~0x7) * 3
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buffer = (ctypes.c_ubyte * (height * rgb_pitch))()
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i = 0
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for row in bits:
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for packed in row:
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for _ in range(8):
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rgb = palette[(packed & 0x80) >> 7]
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buffer[i] = rgb.rgbRed
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buffer[i + 1] = rgb.rgbGreen
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buffer[i + 2] = rgb.rgbBlue
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i += 3
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packed <<= 1
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return ImageData(width, height, 'RGB', buffer, pitch_sign * rgb_pitch)
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def decode_4bit(bits, palette, width, height, pitch, pitch_sign):
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rgb_pitch = (((pitch << 1) + 1) & ~0x1) * 3
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buffer = (ctypes.c_ubyte * (height * rgb_pitch))()
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i = 0
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for row in bits:
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for packed in row:
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for index in ((packed & 0xf0) >> 4, packed & 0xf):
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rgb = palette[index]
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buffer[i] = rgb.rgbRed
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buffer[i + 1] = rgb.rgbGreen
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buffer[i + 2] = rgb.rgbBlue
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i += 3
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return ImageData(width, height, 'RGB', buffer, pitch_sign * rgb_pitch)
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def decode_8bit(bits, palette, width, height, pitch, pitch_sign):
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rgb_pitch = pitch * 3
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buffer = (ctypes.c_ubyte * (height * rgb_pitch))()
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i = 0
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for row in bits:
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for index in row:
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rgb = palette[index]
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buffer[i] = rgb.rgbRed
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buffer[i + 1] = rgb.rgbGreen
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buffer[i + 2] = rgb.rgbBlue
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i += 3
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return ImageData(width, height, 'RGB', buffer, pitch_sign * rgb_pitch)
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def decode_24bit(bits, palette, width, height, pitch, pitch_sign):
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buffer = (ctypes.c_ubyte * (height * pitch))()
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ctypes.memmove(buffer, bits, len(buffer))
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return ImageData(width, height, 'BGR', buffer, pitch_sign * pitch)
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def decode_32bit_rgb(bits, palette, width, height, pitch, pitch_sign):
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buffer = (ctypes.c_ubyte * (height * pitch))()
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ctypes.memmove(buffer, bits, len(buffer))
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return ImageData(width, height, 'BGRA', buffer, pitch_sign * pitch)
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def get_shift(mask):
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if not mask:
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return 0
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# Shift down
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shift = 0
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while not (1 << shift) & mask:
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shift += 1
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# Shift up
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shift_up = 0
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while (mask >> shift) >> shift_up:
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shift_up += 1
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s = shift - (8 - shift_up)
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if s < 0:
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return 0, -s
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else:
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return s, 0
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def decode_bitfields(bits, r_mask, g_mask, b_mask,
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width, height, pitch, pitch_sign):
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r_shift1, r_shift2 = get_shift(r_mask)
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g_shift1, g_shift2 = get_shift(g_mask)
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b_shift1, b_shift2 = get_shift(b_mask)
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rgb_pitch = 3 * len(bits[0])
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buffer = (ctypes.c_ubyte * (height * rgb_pitch))()
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i = 0
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for row in bits:
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for packed in row:
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buffer[i] = (packed & r_mask) >> r_shift1 << r_shift2
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buffer[i+1] = (packed & g_mask) >> g_shift1 << g_shift2
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buffer[i+2] = (packed & b_mask) >> b_shift1 << b_shift2
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i += 3
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return ImageData(width, height, 'RGB', buffer, pitch_sign * rgb_pitch)
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def get_decoders():
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return [BMPImageDecoder()]
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def get_encoders():
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return []
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