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Shore-up image rescaling.

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This commit is contained in:
Marshall T. Vandegrift 2008-12-30 09:50:52 -05:00
parent c9124017af
commit 4bae0a44fd
1 changed files with 22 additions and 27 deletions
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49
src/calibre/ebooks/mobi/writer.py
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@ -169,16 +169,6 @@ class Serializer(object):
buffer.write('%010d' % ioff)
def preserve(function):
def wrapper(self, *args, **kwargs):
opos = self._stream.tell()
try:
return function(self, *args, **kwargs)
finally:
self._stream.seek(opos)
functools.update_wrapper(wrapper, function)
return wrapper
class MobiWriter(object):
def __init__(self, compress=None, logger=FauxLogger()):
self._compress = compress or UNCOMPRESSED
@ -235,6 +225,24 @@ class MobiWriter(object):
data = text.read(0x1000)
self._text_nrecords = nrecords
def _rescale_image(self, data, maxsizeb, dimen=None):
if dimen is not None:
image = Image.open(StringIO(data))
image.thumbnail(dimen, Image.ANTIALIAS)
data = StringIO()
image.save(data, image.format)
data = data.getvalue()
if len(data) < maxsizeb:
return data
image = Image.open(StringIO(data))
for quality in xrange(95, -1, -1):
data = StringIO()
image.save(data, 'JPEG', quality=quality)
data = data.getvalue()
if len(data) <= maxsizeb:
break
return data
def _generate_images(self):
images = [(index, href) for href, index in self._images.items()]
images.sort()
@ -242,17 +250,9 @@ class MobiWriter(object):
coverid = metadata.cover[0] if metadata.cover else None
for _, href in images:
item = self._oeb.manifest.hrefs[href]
data = item.data
# TODO: Re-size etc images
image = Image.open(StringIO(item.data))
maxsizek = 89 if coverid == item.id else 63
maxsizeb = maxsizek * 1024
for quality in xrange(95, -1, -1):
data = StringIO()
image.save(data, 'JPEG', quality=quality)
data = data.getvalue()
if len(data) <= maxsizeb:
break
data = self._rescale_image(item.data, maxsizeb)
self._records.append(data)
def _generate_record0(self):
@ -313,14 +313,9 @@ class MobiWriter(object):
return ''.join(exth)
def _add_thumbnail(self, item):
thumbnail = Image.open(StringIO(item.data))
thumbnail.thumbnail((180, 240), Image.ANTIALIAS)
for quality in xrange(95, -1, -1):
data = StringIO()
thumbnail.save(data, 'JPEG', quality=quality)
data = data.getvalue()
if len(data) <= (1024 * 16):
break
maxsizeb = 16 * 1024
dimen = (180, 240)
data = self._rescale_image(item.data, maxsizeb, dimen)
manifest = self._oeb.manifest
id, href = manifest.generate('thumbnail', 'thumbnail.jpeg')
manifest.add(id, href, 'image/jpeg', data=data)