When rasterizing svg file, I would like to be able to set width and height for the resulting png file. With the following code, only the canvas is set to the desired width and height, the actual image content with the original svg file dimension is rendered in the top left corner on the (500, 600) canvas.
import cairo
import rsvg
WIDTH, HEIGHT = 500, 600
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, WIDTH, HEIGHT)
ctx = cairo.Context(surface)
svg = rsvg.Handle(file="test.svg")
svg.render_cairo(ctx)
surface.write_to_png("test.png")
What should I do to make the image content same size with cairo canvas? I tried
svg.set_property('width', 500)
svg.set_property('height', 500)
but got
TypeError: property 'width' is not writable
Also documents for librsvg python binding seem to be extremely rare, only some random code snippets on cairo site.