Re: [AGG] PDF and AGG

[Maxim S. <mcs...@ya...>]

> Can someone tell me which kinds of shading does AGG support from the PDF 
> specification?  The list from version 1.3 of PDF reference is:
> 
> 1.  Function-based shading
> 2  Axial shading
> 3.  Radial shading
> 4  Free Form Gouraud
> 5.  Lattice-from Gouraud
> 6  Coons patch mesh
> 7  Tensor product patch mesh

For now there're only gradients with use an arbitrary C++ functor and Gouraud
shading of triangles (linear color interpolation between triangle vertices). 
The standards usually have gigantomania, they try to describe the whole known
Universe, whatever it takes. Take SVG, for example. It's almost impossible to
implement all its features in reasonable time and budget. The only more or less
full implementation I know is Adobe SVG viewer. But when you try to use some
non-trivial possibilities of SVG, it starts crashing, leaking, etc. 
I try to concentrate on primary needs keeping the implementation efficient and
reliable.

> Will it be enough if I can somehow convert the outline of the character glyph
> 
> from freetype into a path that AGG can understand?  Then instead of having 
> freetype do the rendering and blending it on top the agg graphics, one can 
> let AGG render the outlines?  Am I making any sense?

Yes. There're two ways of using FreeType. Fist is just rendering the rasterized
glyps, and secong, to use FreeType as a path source. In the last case you can
apply any available transformations, like stroke, contour, etc. Particulary,
you can use it as a clipping path (which is not implemented yet).

McSeem


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