def topil(self):
"""Returns a PIL.Image version of this Pix"""
from PIL import Image # pylint: disable=import-outside-toplevel
# Leptonica manages data in words, so it implicitly does an endian
# swap. Tell Pillow about this when it reads the data.
pix = self
if sys.byteorder == 'little':
if self.mode == 'RGB':
raw_mode = 'XBGR'
elif self.mode == 'RGBA':
raw_mode = 'ABGR'
elif self.mode == '1':
raw_mode = '1;I'
pix = Pix(lept.pixEndianByteSwapNew(pix._cdata))
else:
raw_mode = self.mode
pix = Pix(lept.pixEndianByteSwapNew(pix._cdata))
else:
raw_mode = self.mode # no endian swap needed
size = (pix._cdata.w, pix._cdata.h)
bytecount = pix._cdata.wpl * 4 * pix._cdata.h
buf = ffi.buffer(pix._cdata.data, bytecount)
stride = pix._cdata.wpl * 4
im = Image.frombytes(self.mode, size, buf, 'raw', raw_mode, stride)
return im
def _repr_png_(self):
"""iPython display hook
returns png version of image
"""
data = ffi.new('l_uint8 **')
size = ffi.new('size_t *')
err = lept.pixWriteMemPng(data, size, self._cdata, 0)
if err != 0:
raise LeptonicaIOError("pixWriteMemPng")
char_data = ffi.cast('char *', data[0])
return ffi.buffer(char_data, size[0])[:]
def __getstate__(self):
data = ffi.new('l_uint32 **')
size = ffi.new('size_t *')
err = lept.pixSerializeToMemory(self._cdata, data, size)
if err != 0:
raise LeptonicaIOError("pixSerializeToMemory")
char_data = ffi.cast('char *', data[0])
# Copy from C bytes to python bytes()
data_bytes = ffi.buffer(char_data, size[0])[:]
# Can now free C bytes
lept.lept_free(char_data)
return dict(data=data_bytes)
def write_implied_format(self, path, jpeg_quality=0, jpeg_progressive=0):
"""Write pix to the filename, with the extension indicating format.
jpeg_quality -- quality (iff JPEG; 1 - 100, 0 for default)
jpeg_progressive -- (iff JPEG; 0 for baseline seq., 1 for progressive)
"""
lept_format = lept.getImpliedFileFormat(os.fsencode(path))
with open(path, 'wb') as py_file:
data = ffi.new('l_uint8 **pdata')
size = ffi.new('size_t *psize')
with _LeptonicaErrorTrap():
if lept_format == lept.L_JPEG_ENCODE:
lept.pixWriteMemJpeg(data, size, self._cdata, jpeg_quality,
jpeg_progressive)
else:
lept.pixWriteMem(data, size, self._cdata, lept_format)
buffer = ffi.buffer(data[0], size[0])
py_file.write(buffer)
def get_palette_pdf_string(self):
"Returns palette pre-formatted for use in PDF"
buflen = len('< ') + len(' rrggbb') * self._cdata.ncolors + len('>')
buf = ffi.buffer(self._cdata.cmapdatahex, buflen)
return bytes(buf)
def read(self):
buf = ffi.buffer(self._cdata.datacomp, self._cdata.nbytescomp)
return bytes(buf)