def __render_img(self, factor):
# TODO(Jflesch): In a perfect world, we shouldn't use ImageSurface.
# we should draw directly on the GtkImage.window.cairo_create()
# context. It would be much more efficient.
if factor not in self.__img_cache:
logger.debug('Building img from pdf with factor: %s' % factor)
width = int(factor * self._size[0])
height = int(factor * self._size[1])
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
ctx = cairo.Context(surface)
ctx.scale(factor, factor)
self.pdf_page.render(ctx)
self.__img_cache[factor] = surface2image(surface)
return self.__img_cache[factor]
def refresh(self):
# make the preview
tmp = "%s.%s" % (os.tempnam(None,
"paperwork_export_"), self.valid_exts[0])
path = self.__save(tmp, pages=(0, 1))
# reload the preview
pdfdoc = Poppler.Document.new_from_file(
("file://%s" % urllib.quote(path)), password=None)
assert (pdfdoc.get_n_pages() > 0)
pdfpage = pdfdoc.get_page(0)
pdfpage_size = pdfpage.get_size()
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, int(pdfpage_size[0]),
int(pdfpage_size[1]))
ctx = cairo.Context(surface)
pdfpage.render(ctx)
img = surface2image(surface)
self.__preview = (path, img)
