Thank you guys for your suggestions, but I realized I need to clarify a bit what I'm doing.

What I'm trying to achieve is creating a new blank GD::Image and draw inside it with all the (already existing) graphics primitives of GD. One (or more) of these drawing operations should render SVG text "documents" onto the existing GD::Image.

I'd like to mix and match classic GD drawing (line, rectangle, filledRectangle, ...) with SVG drawing (ex.: $gdImage->svgDraw($svgtext)).

This should be good to "prepare the way" to SVG. I mean, when (and only God knows) Internet Explorer will have SVG support, we could directly render into SVG, because all the underlying data is already in that format.

Nevertheless, I'm going to take a closer look at your example (++), at Image::Magick's SVG features and libsvg, which are all quite interesting.