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79 lines
1.9 KiB
Python
79 lines
1.9 KiB
Python
from . import Image, ImageFile, _webp
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from io import BytesIO
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_VALID_WEBP_MODES = {
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"RGB": True,
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"RGBA": True,
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}
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_VP8_MODES_BY_IDENTIFIER = {
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b"VP8 ": "RGB",
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b"VP8X": "RGBA",
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b"VP8L": "RGBA", # lossless
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}
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def _accept(prefix):
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is_riff_file_format = prefix[:4] == b"RIFF"
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is_webp_file = prefix[8:12] == b"WEBP"
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is_valid_vp8_mode = prefix[12:16] in _VP8_MODES_BY_IDENTIFIER
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return is_riff_file_format and is_webp_file and is_valid_vp8_mode
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class WebPImageFile(ImageFile.ImageFile):
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format = "WEBP"
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format_description = "WebP image"
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def _open(self):
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data, width, height, self.mode, icc_profile, exif = \
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_webp.WebPDecode(self.fp.read())
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if icc_profile:
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self.info["icc_profile"] = icc_profile
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if exif:
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self.info["exif"] = exif
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self.size = width, height
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self.fp = BytesIO(data)
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self.tile = [("raw", (0, 0) + self.size, 0, self.mode)]
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def _getexif(self):
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from .JpegImagePlugin import _getexif
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return _getexif(self)
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def _save(im, fp, filename):
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image_mode = im.mode
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if im.mode not in _VALID_WEBP_MODES:
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raise IOError("cannot write mode %s as WEBP" % image_mode)
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lossless = im.encoderinfo.get("lossless", False)
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quality = im.encoderinfo.get("quality", 80)
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icc_profile = im.encoderinfo.get("icc_profile", "")
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exif = im.encoderinfo.get("exif", "")
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data = _webp.WebPEncode(
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im.tobytes(),
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im.size[0],
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im.size[1],
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lossless,
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float(quality),
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im.mode,
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icc_profile,
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exif
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)
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if data is None:
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raise IOError("cannot write file as WEBP (encoder returned None)")
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fp.write(data)
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Image.register_open(WebPImageFile.format, WebPImageFile, _accept)
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Image.register_save(WebPImageFile.format, _save)
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Image.register_extension(WebPImageFile.format, ".webp")
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Image.register_mime(WebPImageFile.format, "image/webp")
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