def _bounding_box(self):
# Determine the size of the page at 72 dpi.
mediabox = mupdf.Rect()
mupdf.bound_page(self._context, self._c_page, mediabox)
# 'mediabox {}'.format(mupdf.str_rect(mediabox)))
return mediabox
def _transform_bounding_box(self,
rotation=0,
resolution=72,
width=0, height=0, fit=False):
bounds = self._bounding_box()
scale = resolution / 72.
transform = mupdf.Matrix()
mupdf.pre_scale(mupdf.rotate(transform, rotation), scale, scale)
tmp_bounds = mupdf.Rect()
mupdf.copy_rect(tmp_bounds, bounds)
ibounds = mupdf.IRect()
mupdf.round_rect(ibounds, mupdf.transform_rect(tmp_bounds, transform))
# If a resolution is specified, check to see whether width/height are exceeded if not, unset them.
if resolution != 72:
actual_width = ibounds.x1 - ibounds.x0
actual_height = ibounds.y1 - ibounds.y0
if width and actual_width <= width:
width = 0
if height and actual_height <= height:
height = 0
# Now width or height will be 0 unless they need to be enforced.
if width or height:
scale_x = width / (tmp_bounds.x1 - tmp_bounds.x0)
scale_y = height / (tmp_bounds.y1 - tmp_bounds.y0)
if fit: # ignore aspect
if not scale_x:
scale_x = 1.0 # keep computed width
elif not scale_y:
scale_y = 1.0 # keep computed height
else:
if not scale_x:
scale_x = scale_y
elif not scale_y:
scale_y = scale_x
else:
# take the smallest scale
if scale_x > scale_y:
scale_x = scale_y
else:
scale_y = scale_x
scale_mat = mupdf.Matrix()
mupdf.scale(scale_mat, scale_x, scale_y)
mupdf.concat(transform, transform, scale_mat)
mupdf.copy_rect(tmp_bounds, bounds)
mupdf.transform_rect(tmp_bounds, transform)
mupdf.round_rect(ibounds, tmp_bounds)
return transform, ibounds