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scikit-image/scikits/image/io/_plugins/freeimage_plugin.py
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import ctypes
import numpy
import sys
import os
import os.path
from numpy.compat import asbytes
def _load_library(libname, loader_path):
""" A small fork of numpy.ctypeslib.load_library
to support windll.
"""
if ctypes.__version__ < '1.0.1':
import warnings
warnings.warn("All features of ctypes interface may not work " \
"with ctypes < 1.0.1")
ext = os.path.splitext(libname)[1]
if not ext:
# Try to load library with platform-specific name, otherwise
# default to libname.[so|pyd]. Sometimes, these files are built
# erroneously on non-linux platforms.
libname_ext = ['%s.so' % libname, '%s.pyd' % libname]
if sys.platform == 'win32':
libname_ext.insert(0, '%s.dll' % libname)
elif sys.platform == 'darwin':
libname_ext.insert(0, '%s.dylib' % libname)
else:
libname_ext = [libname]
loader_path = os.path.abspath(loader_path)
if not os.path.isdir(loader_path):
libdir = os.path.dirname(loader_path)
else:
libdir = loader_path
for ln in libname_ext:
try:
libpath = os.path.join(libdir, ln)
if sys.platform == 'win32':
return ctypes.windll[libpath]
else:
return ctypes.cdll[libpath]
except OSError, e:
pass
raise e
lib_dirs = [os.path.dirname(__file__),
'/lib',
'/usr/lib',
'/usr/local/lib',
'/opt/local/lib',
]
if 'HOME' in os.environ:
lib_dirs.append(os.path.join(os.environ['HOME'], 'lib'))
API = {
'FreeImage_Load': (ctypes.c_void_p,
[ctypes.c_int, ctypes.c_char_p, ctypes.c_int]),
'FreeImage_GetWidth': (ctypes.c_uint,
[ctypes.c_void_p]),
'FreeImage_GetHeight': (ctypes.c_uint,
[ctypes.c_void_p]),
'FreeImage_GetImageType': (ctypes.c_uint,
[ctypes.c_void_p]),
'FreeImage_GetBPP': (ctypes.c_uint,
[ctypes.c_void_p]),
'FreeImage_GetPitch': (ctypes.c_uint,
[ctypes.c_void_p]),
'FreeImage_GetBits': (ctypes.c_void_p,
[ctypes.c_void_p]),
}
# Albert's ctypes pattern
def register_api(lib,api):
for f, (restype, argtypes) in api.items():
func = getattr(lib, f)
func.restype = restype
func.argtypes = argtypes
_FI = None
for d in lib_dirs:
for libname in ('freeimage', 'FreeImage',
'libfreeimage', 'libFreeImage'):
try:
_FI = _load_library(libname, d)
except OSError:
pass
else:
break
if _FI is not None:
break
if not _FI:
raise OSError('Could not find libFreeImage in any of the following '
'directories: \'%s\'' % '\', \''.join(lib_dirs))
register_api(_FI, API)
if sys.platform == 'win32':
_functype = ctypes.WINFUNCTYPE
else:
_functype = ctypes.CFUNCTYPE
@_functype(None, ctypes.c_int, ctypes.c_char_p)
def _error_handler(fif, message):
raise RuntimeError('FreeImage error: %s' % message)
_FI.FreeImage_SetOutputMessage(_error_handler)
class FI_TYPES(object):
FIT_UNKNOWN = 0
FIT_BITMAP = 1
FIT_UINT16 = 2
FIT_INT16 = 3
FIT_UINT32 = 4
FIT_INT32 = 5
FIT_FLOAT = 6
FIT_DOUBLE = 7
FIT_COMPLEX = 8
FIT_RGB16 = 9
FIT_RGBA16 = 10
FIT_RGBF = 11
FIT_RGBAF = 12
dtypes = {
FIT_BITMAP: numpy.uint8,
FIT_UINT16: numpy.uint16,
FIT_INT16: numpy.int16,
FIT_UINT32: numpy.uint32,
FIT_INT32: numpy.int32,
FIT_FLOAT: numpy.float32,
FIT_DOUBLE: numpy.float64,
FIT_COMPLEX: numpy.complex128,
FIT_RGB16: numpy.uint16,
FIT_RGBA16: numpy.uint16,
FIT_RGBF: numpy.float32,
FIT_RGBAF: numpy.float32
}
fi_types = {
(numpy.uint8, 1): FIT_BITMAP,
(numpy.uint8, 3): FIT_BITMAP,
(numpy.uint8, 4): FIT_BITMAP,
(numpy.uint16, 1): FIT_UINT16,
(numpy.int16, 1): FIT_INT16,
(numpy.uint32, 1): FIT_UINT32,
(numpy.int32, 1): FIT_INT32,
(numpy.float32, 1): FIT_FLOAT,
(numpy.float64, 1): FIT_DOUBLE,
(numpy.complex128, 1): FIT_COMPLEX,
(numpy.uint16, 3): FIT_RGB16,
(numpy.uint16, 4): FIT_RGBA16,
(numpy.float32, 3): FIT_RGBF,
(numpy.float32, 4): FIT_RGBAF
}
extra_dims = {
FIT_UINT16: [],
FIT_INT16: [],
FIT_UINT32: [],
FIT_INT32: [],
FIT_FLOAT: [],
FIT_DOUBLE: [],
FIT_COMPLEX: [],
FIT_RGB16: [3],
FIT_RGBA16: [4],
FIT_RGBF: [3],
FIT_RGBAF: [4]
}
@classmethod
def get_type_and_shape(cls, bitmap):
w = _FI.FreeImage_GetWidth(bitmap)
h = _FI.FreeImage_GetHeight(bitmap)
fi_type = _FI.FreeImage_GetImageType(bitmap)
if not fi_type:
raise ValueError('Unknown image pixel type')
dtype = cls.dtypes[fi_type]
if fi_type == cls.FIT_BITMAP:
bpp = _FI.FreeImage_GetBPP(bitmap)
if bpp == 8:
extra_dims = []
elif bpp == 24:
extra_dims = [3]
elif bpp == 32:
extra_dims = [4]
else:
raise ValueError('Cannot convert %d BPP bitmap' % bpp)
else:
extra_dims = cls.extra_dims[fi_type]
return numpy.dtype(dtype), extra_dims + [w, h]
class IO_FLAGS(object):
#Bmp
BMP_DEFAULT = 0
BMP_SAVE_RLE = 1
#Png
PNG_DEFAULT = 0
PNG_IGNOREGAMMA = 1
#Gif
GIF_DEFAULT = 0
GIF_LOAD256 = 1
GIF_PLAYBACK = 2
#Ico
ICO_DEFAULT = 0
ICO_MAKEALPHA = 1
#Tiff
TIFF_DEFAULT = 0
TIFF_CMYK = 0x0001
TIFF_NONE = 0x0800
TIFF_PACKBITS = 0x0100
TIFF_DEFLATE = 0x0200
TIFF_ADOBE_DEFLATE = 0x0400
TIFF_CCITTFAX3 = 0x1000
TIFF_CCITTFAX4 = 0x2000
TIFF_LZW = 0x4000
TIFF_JPEG = 0x8000
#Jpeg
JPEG_DEFAULT = 0
JPEG_FAST = 1
JPEG_ACCURATE = 2
JPEG_QUALITYSUPERB = 0x80
JPEG_QUALITYGOOD = 0x100
JPEG_QUALITYNORMAL = 0x200
JPEG_QUALITYAVERAGE = 0x400
JPEG_QUALITYBAD = 0x800
JPEG_CMYK = 0x1000
JPEG_PROGRESSIVE = 0x2000
#Others...
CUT_DEFAULT = 0
DDS_DEFAULT = 0
HDR_DEFAULT = 0
IFF_DEFAULT = 0
KOALA_DEFAULT = 0
LBM_DEFAULT = 0
MNG_DEFAULT = 0
PCD_DEFAULT = 0
PCD_BASE = 1
PCD_BASEDIV4 = 2
PCD_BASEDIV16 = 3
PCX_DEFAULT = 0
PNM_DEFAULT = 0
PNM_SAVE_RAW = 0
PNM_SAVE_ASCII = 1
PSD_DEFAULT = 0
RAS_DEFAULT = 0
TARGA_DEFAULT = 0
TARGA_LOAD_RGB888 = 1
WBMP_DEFAULT = 0
XBM_DEFAULT = 0
class METADATA_MODELS(object):
FIMD_NODATA = -1
FIMD_COMMENTS = 0
FIMD_EXIF_MAIN = 1
FIMD_EXIF_EXIF = 2
FIMD_EXIF_GPS = 3
FIMD_EXIF_MAKERNOTE = 4
FIMD_EXIF_INTEROP = 5
FIMD_IPTC = 6
FIMD_XMP = 7
FIMD_GEOTIFF = 8
FIMD_ANIMATION = 9
FIMD_CUSTOM = 10
def read(filename, flags=0):
"""Read an image to a numpy array of shape (width, height) for
greyscale images, or shape (width, height, nchannels) for RGB or
RGBA images.
"""
bitmap = _read_bitmap(filename, flags)
try:
return _array_from_bitmap(bitmap)
finally:
_FI.FreeImage_Unload(bitmap)
def read_multipage(filename, flags=0):
"""Read a multipage image to a list of numpy arrays, where each
array is of shape (width, height) for greyscale images, or shape
(nchannels, width, height) for RGB or RGBA images.
"""
filename = asbytes(filename)
ftype = _FI.FreeImage_GetFileType(filename, 0)
if ftype == -1:
raise ValueError('Cannot determine type of file %s' % filename)
create_new = False
read_only = True
keep_cache_in_memory = True
multibitmap = _FI.FreeImage_OpenMultiBitmap(ftype, filename, create_new,
read_only, keep_cache_in_memory,
flags)
if not multibitmap:
raise ValueError('Could not open %s as multi-page image.' % filename)
try:
multibitmap = ctypes.c_void_p(multibitmap)
pages = _FI.FreeImage_GetPageCount(multibitmap)
arrays = []
for i in range(pages):
bitmap = _FI.FreeImage_LockPage(multibitmap, i)
bitmap = ctypes.c_void_p(bitmap)
try:
arrays.append(_array_from_bitmap(bitmap))
finally:
_FI.FreeImage_UnlockPage(multibitmap, bitmap, False)
return arrays
finally:
_FI.FreeImage_CloseMultiBitmap(multibitmap, 0)
def _read_bitmap(filename, flags):
"""Load a file to a FreeImage bitmap pointer"""
filename = asbytes(filename)
ftype = _FI.FreeImage_GetFileType(filename, 0)
if ftype == -1:
raise ValueError('Cannot determine type of file %s' % filename)
bitmap = _FI.FreeImage_Load(ftype, filename, flags)
if not bitmap:
raise ValueError('Could not load file %s' % filename)
return ctypes.c_void_p(bitmap)
def _wrap_bitmap_bits_in_array(bitmap, shape, dtype):
"""Return an ndarray view on the data in a FreeImage bitmap. Only
valid for as long as the bitmap is loaded (if single page) / locked
in memory (if multipage).
"""
pitch = _FI.FreeImage_GetPitch(bitmap)
height = shape[-1]
byte_size = height * pitch
itemsize = dtype.itemsize
if len(shape) == 3:
strides = (itemsize, shape[0]*itemsize, pitch)
else:
strides = (itemsize, pitch)
bits = _FI.FreeImage_GetBits(bitmap)
array = numpy.ndarray(shape, dtype=dtype,
buffer=(ctypes.c_char*byte_size).from_address(bits),
strides=strides)
return array
def _array_from_bitmap(bitmap):
"""Convert a FreeImage bitmap pointer to a numpy array
"""
dtype, shape = FI_TYPES.get_type_and_shape(bitmap)
array = _wrap_bitmap_bits_in_array(bitmap, shape, dtype)
# swizzle the color components and flip the scanlines to go from
# FreeImage's BGR[A] and upside-down internal memory format to something
# more normal
def n(arr):
return arr[..., ::-1].T
if len(shape) == 3 and _FI.FreeImage_IsLittleEndian() and \
dtype.type == numpy.uint8:
b = n(array[0])
g = n(array[1])
r = n(array[2])
if shape[0] == 3:
return numpy.dstack( (r, g, b) )
elif shape[0] == 4:
a = n(array[3])
return numpy.dstack( (r, g, b, a) )
else:
raise ValueError('Cannot handle images of shape %s' % shape)
# We need to copy because array does *not* own its memory
# after bitmap is freed.
return n(array).copy()
def string_tag(bitmap, key, model=METADATA_MODELS.FIMD_EXIF_MAIN):
"""Retrieve the value of a metadata tag with the given string key as a
string."""
tag = ctypes.c_int()
if not _FI.FreeImage_GetMetadata(model, bitmap, str(key),
ctypes.byref(tag)):
return
char_ptr = ctypes.c_char * _FI.FreeImage_GetTagLength(tag)
return char_ptr.from_address(_FI.FreeImage_GetTagValue(tag)).raw()
def write(array, filename, flags=0):
"""Write a (width, height) or (width, height, nchannels) array to
a greyscale, RGB, or RGBA image, with file type deduced from the
filename.
"""
filename = asbytes(filename)
ftype = _FI.FreeImage_GetFIFFromFilename(filename)
if ftype == -1:
raise ValueError('Cannot determine type for %s' % filename)
bitmap, fi_type = _array_to_bitmap(array)
try:
if fi_type == FI_TYPES.FIT_BITMAP:
can_write = _FI.FreeImage_FIFSupportsExportBPP(ftype,
_FI.FreeImage_GetBPP(bitmap))
else:
can_write = _FI.FreeImage_FIFSupportsExportType(ftype, fi_type)
if not can_write:
raise TypeError('Cannot save image of this format '
'to this file type')
res = _FI.FreeImage_Save(ftype, bitmap, filename, flags)
if not res:
raise RuntimeError('Could not save image properly.')
finally:
_FI.FreeImage_Unload(bitmap)
def write_multipage(arrays, filename, flags=0):
"""Write a list of (width, height) or (nchannels, width, height)
arrays to a multipage greyscale, RGB, or RGBA image, with file type
deduced from the filename.
"""
filename = asbytes(filename)
ftype = _FI.FreeImage_GetFIFFromFilename(filename)
if ftype == -1:
raise ValueError('Cannot determine type of file %s' % filename)
create_new = True
read_only = False
keep_cache_in_memory = True
multibitmap = _FI.FreeImage_OpenMultiBitmap(ftype, filename,
create_new, read_only,
keep_cache_in_memory, 0)
if not multibitmap:
raise ValueError('Could not open %s for writing multi-page image.' %
filename)
try:
multibitmap = ctypes.c_void_p(multibitmap)
for array in arrays:
bitmap, fi_type = _array_to_bitmap(array)
_FI.FreeImage_AppendPage(multibitmap, bitmap)
finally:
_FI.FreeImage_CloseMultiBitmap(multibitmap, flags)
# 4-byte quads of 0,v,v,v from 0,0,0,0 to 0,255,255,255
_GREY_PALETTE = numpy.arange(0, 0x01000000, 0x00010101, dtype=numpy.uint32)
def _array_to_bitmap(array):
"""Allocate a FreeImage bitmap and copy a numpy array into it.
"""
shape = array.shape
dtype = array.dtype
r,c = shape[:2]
if len(shape) == 2:
n_channels = 1
w_shape = (c,r)
elif len(shape) == 3:
n_channels = shape[2]
w_shape = (n_channels,c,r)
else:
n_channels = shape[0]
try:
fi_type = FI_TYPES.fi_types[(dtype.type, n_channels)]
except KeyError:
raise ValueError('Cannot write arrays of given type and shape.')
itemsize = array.dtype.itemsize
bpp = 8 * itemsize * n_channels
bitmap = _FI.FreeImage_AllocateT(fi_type, c, r, bpp, 0, 0, 0)
if not bitmap:
raise RuntimeError('Could not allocate image for storage')
try:
def n(arr): # normalise to freeimage's in-memory format
return arr.T[:,::-1]
bitmap = ctypes.c_void_p(bitmap)
wrapped_array = _wrap_bitmap_bits_in_array(bitmap, w_shape, dtype)
# swizzle the color components and flip the scanlines to go to
# FreeImage's BGR[A] and upside-down internal memory format
if len(shape) == 3 and _FI.FreeImage_IsLittleEndian() and \
dtype.type == numpy.uint8:
wrapped_array[0] = n(array[:,:,2])
wrapped_array[1] = n(array[:,:,1])
wrapped_array[2] = n(array[:,:,0])
if shape[2] == 4:
wrapped_array[3] = n(array[:,:,3])
else:
wrapped_array[:] = n(array)
if len(shape) == 2 and dtype.type == numpy.uint8:
palette = _FI.FreeImage_GetPalette(bitmap)
if not palette:
raise RuntimeError('Could not get image palette')
ctypes.memmove(palette, _GREY_PALETTE.ctypes.data, 1024)
return bitmap, fi_type
except:
_FI.FreeImage_Unload(bitmap)
raise
def imread(filename, as_grey=False):
"""
img = imread(filename, as_grey=False)
Reads an image from file `filename`
Parameters
----------
filename : file name
as_grey : Whether to convert to grey scale image (default: no)
Returns
-------
img : ndarray
"""
img = read(filename)
if as_grey and len(img) == 3:
# these are the values that wikipedia says are typical
transform = numpy.array([ 0.30, 0.59, 0.11])
return numpy.dot(img, transform)
return img
def imsave(filename, img):
'''
imsave(filename, img)
Save image to disk
Image type is inferred from filename
Parameters
----------
filename : file name
img : image to be saved as nd array
'''
write(img, filename)
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