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https://github.com/python-pillow/Pillow.git
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Merged gifmaker into GifImagePlugin
This commit is contained in:
Andrew Murray
parent
75be4af068
commit
2c4fe7281f
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@ -24,7 +24,7 @@
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# See the README file for information on usage and redistribution.
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#
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from PIL import Image, ImageFile, ImagePalette, _binary
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from PIL import Image, ImageFile, ImagePalette, ImageChops, ImageSequence, _binary
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__version__ = "0.9"
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@ -284,8 +284,10 @@ RAWMODE = {
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"P": "P",
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}
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def _save_all(im, fp, filename):
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_save(im, fp, filename, save_all=True)
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def _save(im, fp, filename):
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def _save(im, fp, filename, save_all=False):
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if _imaging_gif:
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# call external driver
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@ -315,7 +317,31 @@ def _save(im, fp, filename):
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palette = None
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im.encoderinfo["optimize"] = im.encoderinfo.get("optimize", True)
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header, used_palette_colors = getheader(im_out, palette, im.encoderinfo)
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if save_all:
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previous = None
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for im_frame in ImageSequence.Iterator(im_out):
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# To specify duration, add the time in milliseconds to getdata(),
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# e.g. getdata(im_frame, duration=1000)
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if not previous:
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# global header
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for s in getheader(im_frame, palette, im.encoderinfo)[0] + getdata(im_frame):
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fp.write(s)
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else:
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# delta frame
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delta = ImageChops.subtract_modulo(im_frame, previous)
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bbox = delta.getbbox()
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if bbox:
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# compress difference
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for s in getdata(im_frame.crop(bbox), offset=bbox[:2]):
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fp.write(s)
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else:
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# FIXME: what should we do in this case?
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pass
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previous = im_frame.copy()
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else:
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header = getheader(im_out, palette, im.encoderinfo)[0]
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for s in header:
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fp.write(s)
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@ -325,7 +351,7 @@ def _save(im, fp, filename):
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flags = flags | 64
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# local image header
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get_local_header(fp, im, (0, 0), flags)
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_get_local_header(fp, im, (0, 0), flags)
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im_out.encoderconfig = (8, get_interlace(im))
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ImageFile._save(im_out, fp, [("gif", (0, 0)+im.size, 0,
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@ -354,7 +380,7 @@ def get_interlace(im):
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return interlace
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def get_local_header(fp, im, offset, flags):
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def _get_local_header(fp, im, offset, flags):
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transparent_color_exists = False
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try:
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transparency = im.encoderinfo["transparency"]
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@ -577,7 +603,7 @@ def getdata(im, offset=(0, 0), **params):
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im.encoderinfo = params
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# local image header
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get_local_header(fp, im, offset, 0)
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_get_local_header(fp, im, offset, 0)
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ImageFile._save(im, fp, [("gif", (0, 0)+im.size, 0, RAWMODE[im.mode])])
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@ -594,6 +620,7 @@ def getdata(im, offset=(0, 0), **params):
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Image.register_open(GifImageFile.format, GifImageFile, _accept)
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Image.register_save(GifImageFile.format, _save)
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Image.register_save_all(GifImageFile.format, _save_all)
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Image.register_extension(GifImageFile.format, ".gif")
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Image.register_mime(GifImageFile.format, "image/gif")
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26
PIL/Image.py
26
PIL/Image.py
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@ -204,6 +204,7 @@ ID = []
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OPEN = {}
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MIME = {}
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SAVE = {}
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SAVE_ALL = {}
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EXTENSION = {}
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# --------------------------------------------------------------------
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@ -1669,6 +1670,10 @@ class Image(object):
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# may mutate self!
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self.load()
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save_all = False
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if 'save_all' in params:
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save_all = params['save_all']
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del params['save_all']
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self.encoderinfo = params
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self.encoderconfig = ()
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@ -1686,11 +1691,12 @@ class Image(object):
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except KeyError:
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raise KeyError(ext) # unknown extension
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try:
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save_handler = SAVE[format.upper()]
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except KeyError:
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if format.upper() not in SAVE:
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init()
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save_handler = SAVE[format.upper()] # unknown format
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if save_all:
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save_handler = SAVE_ALL[format.upper()]
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else:
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save_handler = SAVE[format.upper()]
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if isPath(fp):
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fp = builtins.open(fp, "wb")
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@ -2469,6 +2475,18 @@ def register_save(id, driver):
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SAVE[id.upper()] = driver
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def register_save_all(id, driver):
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"""
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Registers an image function to save all the frames
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of a multiframe format. This function should not be
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used in application code.
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:param id: An image format identifier.
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:param driver: A function to save images in this format.
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"""
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SAVE_ALL[id.upper()] = driver
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def register_extension(id, extension):
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"""
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Registers an image extension. This function should not be
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@ -14,104 +14,9 @@
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# See the README file for information on usage and redistribution.
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#
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#
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# For special purposes, you can import this module and call
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# the makedelta or compress functions yourself. For example,
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# if you have an application that generates a sequence of
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# images, you can convert it to a GIF animation using some-
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# thing like the following code:
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#
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# import Image
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# import gifmaker
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#
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# sequence = []
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#
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# # generate sequence
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# for i in range(100):
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# im = <generate image i>
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# sequence.append(im)
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#
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# # write GIF animation
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# fp = open("out.gif", "wb")
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# gifmaker.makedelta(fp, sequence)
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# fp.close()
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#
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# Alternatively, use an iterator to generate the sequence, and
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# write data directly to a socket. Or something...
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#
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from __future__ import print_function
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from PIL import Image, ImageChops, ImageSequence
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from PIL.GifImagePlugin import getheader, getdata
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# --------------------------------------------------------------------
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# straightforward delta encoding
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def makedelta(fp, sequence):
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"""Convert list of image frames to a GIF animation file"""
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frames = 0
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previous = None
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for im in sequence:
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# To specify duration, add the time in milliseconds to getdata(),
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# e.g. getdata(im, duration=1000)
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if not previous:
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# global header
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for s in getheader(im)[0] + getdata(im):
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fp.write(s)
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else:
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# delta frame
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delta = ImageChops.subtract_modulo(im, previous)
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bbox = delta.getbbox()
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if bbox:
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# compress difference
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for s in getdata(im.crop(bbox), offset=bbox[:2]):
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fp.write(s)
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else:
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# FIXME: what should we do in this case?
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pass
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previous = im.copy()
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frames += 1
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fp.write(b";")
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return frames
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# --------------------------------------------------------------------
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# main hack
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def compress(infile, outfile):
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# open input image, and force loading of first frame
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im = Image.open(infile)
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im.load()
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# open output file
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fp = open(outfile, "wb")
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seq = ImageSequence.Iterator(im)
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makedelta(fp, seq)
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fp.close()
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from PIL import Image
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if __name__ == "__main__":
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@ -122,4 +27,5 @@ if __name__ == "__main__":
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print("Usage: gifmaker infile outfile")
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sys.exit(1)
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compress(sys.argv[1], sys.argv[2])
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im = Image.open(sys.argv[1])
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im.save(sys.argv[2], save_all=True)
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