separate cairo surfaces for SVG elements

Hi,

For past couple of weeks, I have been hacking librsvg to get it to do what I
want: draw an individual SVG element (rect, path, text, circle, ellipse,
etc.) on a cairo surface of its own size. But I haven't been completely
successful yet. So I decided to post on the mailing list if someone can
suggest a simpler way.

I started from test-display.c code which gives the above functionality but
it will draw the individual element at its relative location in the complete
SVG image.

The interface I want from the library is: Given an ID of the element, the
interface function will give me the boundaries of that element (bbox). Then
I can create a cairo_surface of that size and pass in the cairo_t through
another function. Then the library will draw only that element on that
cairo_t context.

for e.g
bbox = get_element_dimensions(handle, "#path1234")
surface = cairo_image_surface_create(..,bbox.w,bbox.h)
cr = cairo_create(surface)
draw_element(handle,"#path1234",cr)

I am haven't fully understood the matrix transformation that takes place at
several places, so I am having tough time to implement the above interface.

If anyone can suggest a better method or point out some part of API that
already offers this and I have ignored, I will be very greatful.

Thanks in advance.
Jayesh

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