def getdata(im, offset = (0, 0), **params):
"""Return a list of strings representing this image.
The first string is a local image header, the rest contains
encoded image data."""
class collector:
data = []
def write(self, data):
self.data.append(data)
im.load() # make sure raster data is available
fp = collector()
try:
im.encoderinfo = params
# local image header
fp.write("," +
o16(offset[0]) + # offset
o16(offset[1]) +
o16(im.size[0]) + # size
o16(im.size[1]) +
chr(0) + # flags
chr(8)) # bits
ImageFileH._save(im, fp, [("gif", (0,0)+im.size, 0, RAWMODE[im.mode])])
fp.write("\0") # end of image data
finally:
del im.encoderinfo
return fp.data
def _save(im, fp, filename):
if _imaging_gif:
# call external driver
try:
_imaging_gif.save(im, fp, filename)
return
except IOError:
pass # write uncompressed file
# header
for s in getheader(im):
fp.write(s)
# local image header
fp.write("," +
o16(0) + o16(0) + # bounding box
o16(im.size[0]) + # size
o16(im.size[1]) +
chr(0) + # flags
chr(8)) # bits
ImageFileH._save(im, fp, [("gif", (0,0)+im.size, 0, RAWMODE[im.mode])])
fp.write("\0") # end of image data
fp.write(";") # end of file
try:
fp.flush()
except: pass
def getdata(im, offset=(0, 0), **params):
"""Return a list of strings representing this image.
The first string is a local image header, the rest contains
encoded image data."""
class collector:
data = []
def write(self, data):
self.data.append(data)
im.load() # make sure raster data is available
fp = collector()
try:
im.encoderinfo = params
# local image header
fp.write("," + o16(offset[0]) + # offset
o16(offset[1]) + o16(im.size[0]) + # size
o16(im.size[1]) + chr(0) + # flags
chr(8)) # bits
ImageFileH._save(im, fp,
[("gif", (0, 0) + im.size, 0, RAWMODE[im.mode])])
fp.write("\0") # end of image data
finally:
del im.encoderinfo
return fp.data
def _save(im, fp, filename):
if _imaging_gif:
# call external driver
try:
_imaging_gif.save(im, fp, filename)
return
except IOError:
pass # write uncompressed file
# header
for s in getheader(im):
fp.write(s)
# local image header
fp.write("," + o16(0) + o16(0) + # bounding box
o16(im.size[0]) + # size
o16(im.size[1]) + chr(0) + # flags
chr(8)) # bits
ImageFileH._save(im, fp, [("gif", (0, 0) + im.size, 0, RAWMODE[im.mode])])
fp.write("\0") # end of image data
fp.write(";") # end of file
try:
fp.flush()
except:
pass
def _save(im, fp, filename):
try:
rawmode = RAWMODE[im.mode]
except KeyError:
raise IOError, "cannot write mode %s as JPEG" % im.mode
# get keyword arguments
im.encoderconfig = (_fetch(im.encoderinfo, "quality", 0),
im.encoderinfo.has_key("progressive"),
_fetch(im.encoderinfo, "smooth", 0),
im.encoderinfo.has_key("optimize"),
_fetch(im.encoderinfo, "streamtype", 0))
ImageFileH._save(im, fp, [("jpeg", (0,0)+im.size, 0, rawmode)])
def _save(im, fp, filename):
try:
rawmode = RAWMODE[im.mode]
except KeyError:
raise IOError, "cannot write mode %s as JPEG" % im.mode
# get keyword arguments
im.encoderconfig = (_fetch(im.encoderinfo, "quality", 0),
im.encoderinfo.has_key("progressive"),
_fetch(im.encoderinfo, "smooth", 0),
im.encoderinfo.has_key("optimize"),
_fetch(im.encoderinfo, "streamtype", 0))
ImageFileH._save(im, fp, [("jpeg", (0,0)+im.size, 0, rawmode)])
def _save(im, fp, filename, chunk = putchunk):
# save an image to disk (called by the save method)
mode = im.mode
if mode == "P":
#
# attempt to minimize storage requirements for palette images
if im.encoderinfo.has_key("bits"):
# number of bits specified by user
n = 1 << im.encoderinfo["bits"]
else:
# check palette contents
n = 256 # FIXME
if n <= 2:
bits = 1
elif n <= 4:
bits = 2
elif n <= 16:
bits = 4
else:
bits = 8
if bits != 8:
mode = "%s;%d" % (mode, bits)
# encoder options
if im.encoderinfo.has_key("dictionary"):
dictionary = im.encoderinfo["dictionary"]
else:
dictionary = ""
im.encoderconfig = (im.encoderinfo.has_key("optimize"), dictionary)
# get the corresponding PNG mode
try:
rawmode, mode = _OUTMODES[mode]
except KeyError:
raise IOError, "cannot write mode %s as PNG" % mode
#
# write minimal PNG file
fp.write(_MAGIC)
chunk(fp, "IHDR",
o32(im.size[0]), o32(im.size[1]), # 0: size
mode, # 8: depth/type
chr(0), # 10: compression
chr(0), # 11: filter category
chr(0)) # 12: interlace flag
if im.mode == "P":
chunk(fp, "PLTE", im.im.getpalette("RGB"))
if 0:
# FIXME: to be supported some day
chunk(fp, "gAMA", o32(int(gamma * 100000.0)))
ImageFileH._save(im, _idat(fp, chunk), [("zip", (0,0)+im.size, 0, rawmode)])
chunk(fp, "IEND", "")
try:
fp.flush()
except: pass
def _save(im, fp, filename, chunk=putchunk):
# save an image to disk (called by the save method)
mode = im.mode
if mode == "P":
#
# attempt to minimize storage requirements for palette images
if im.encoderinfo.has_key("bits"):
# number of bits specified by user
n = 1 << im.encoderinfo["bits"]
else:
# check palette contents
n = 256 # FIXME
if n <= 2:
bits = 1
elif n <= 4:
bits = 2
elif n <= 16:
bits = 4
else:
bits = 8
if bits != 8:
mode = "%s;%d" % (mode, bits)
# encoder options
if im.encoderinfo.has_key("dictionary"):
dictionary = im.encoderinfo["dictionary"]
else:
dictionary = ""
im.encoderconfig = (im.encoderinfo.has_key("optimize"), dictionary)
# get the corresponding PNG mode
try:
rawmode, mode = _OUTMODES[mode]
except KeyError:
raise IOError, "cannot write mode %s as PNG" % mode
#
# write minimal PNG file
fp.write(_MAGIC)
chunk(
fp,
"IHDR",
o32(im.size[0]),
o32(im.size[1]), # 0: size
mode, # 8: depth/type
chr(0), # 10: compression
chr(0), # 11: filter category
chr(0)) # 12: interlace flag
if im.mode == "P":
chunk(fp, "PLTE", im.im.getpalette("RGB"))
if 0:
# FIXME: to be supported some day
chunk(fp, "gAMA", o32(int(gamma * 100000.0)))
ImageFileH._save(im, _idat(fp, chunk),
[("zip", (0, 0) + im.size, 0, rawmode)])
chunk(fp, "IEND", "")
try:
fp.flush()
except:
pass
