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Conversion pipeline: When rasterizing SVG images workaround incorrect handinlg of percentage height specifications in QSvgRenderer. Fixes #7598 (Image size incorrect for conversion from EPUB to MOBI)

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Kovid Goyal 2010-11-26 08:42:23 -07:00
parent 44482af2ba
commit 31e8fa91b3
1 changed files with 20 additions and 7 deletions
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27
src/calibre/ebooks/oeb/transforms/rasterize.py
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@ -55,18 +55,31 @@ class SVGRasterizer(object):
self.rasterize_cover()
def rasterize_svg(self, elem, width=0, height=0, format='PNG'):
view_box = elem.get('viewBox', elem.get('viewbox', None))
sizes = None
logger = self.oeb.logger
if view_box is not None:
box = [float(x) for x in view_box.split()]
sizes = [box[2]-box[0], box[3] - box[1]]
for image in elem.xpath('descendant::*[local-name()="image" and '
'@height and contains(@height, "%")]'):
logger.info('Found SVG image height in %, trying to convert...')
try:
h = float(image.get('height').replace('%', ''))/100.
image.set('height', str(h*sizes[1]))
except:
logger.exception('Failed to convert percentage height:',
image.get('height'))
data = QByteArray(xml2str(elem, with_tail=False))
svg = QSvgRenderer(data)
size = svg.defaultSize()
view_box = elem.get('viewBox', elem.get('viewbox', None))
if size.width() == 100 and size.height() == 100 \
and view_box is not None:
box = [float(x) for x in view_box.split()]
size.setWidth(box[2] - box[0])
size.setHeight(box[3] - box[1])
if size.width() == 100 and size.height() == 100 and sizes:
size.setWidth(sizes[0])
size.setHeight(sizes[1])
if width or height:
size.scale(width, height, Qt.KeepAspectRatio)
logger = self.oeb.logger
logger.info('Rasterizing %r to %dx%d'
% (elem, size.width(), size.height()))
image = QImage(size, QImage.Format_ARGB32_Premultiplied)