Re: [Gnash-commit] gnash ChangeLog backend/render_handler_agg.cpp

[Bastiaan Jacques]

On Tue, 6 Nov 2007, Bastiaan Jacques wrote:
> From my own testing I conclude the same; the specialized clipping class
> impacts on performance negatively. Interesting to note that this is true
> even when testing movies with complex clipping regions.
> So I think that the clipping patch should probably be reverted.


AGG docs on this class:

"Class renderer_mclip performs clipping to multi-rectangle clipping
areas, but its performance depends on the number of clipping rectangles."

"The cost of creation is minimal, it's just initializing of the class
member variables. But renderer_mclip allocates memory when you add new
clipping rectangles and deallocates it when destroying. It uses the
pod_deque class that allocates blocks of memory of equal size and never
reallocates it. When you reset clipping, the memory is not deallocated,
it's reused. The renderer_mclip deallocates memory only when destroying.
This technique is widely used in AGG and prevents from deep memory
fragmentation."

Bastiaan