[gephex-devel] design changes for gephex-0.5

[Georg Seidel]

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There is also a different way patching is used in gephex-0.4: for inplace
processing.

Assume we have a filter that can opionally work in "inplace mode",
for example it blits a font right into the frame without copying.

This can be done with the following subgraph:

~      _____________________________________
~     |                                     |
~     |inplace                              |
~   --|---------------------.   ____        |
~     |                      \-|b   |       |out
~     |   /--------------------|1  o|--o----|----
~     |in| ________    <out>---|2   |  |    |
~   --|---| filter |-.         '----'  |    |
~     |    --------   \                |    |
~     |                ---------------/     |
~     |                                     |
~     '-------------------------------------'

Depending on the inplace input, either the <out> link or the <in> input
are connected to the filters output.


Can anybody think of another usage of patch/strong_deps that cannot be
done with "lazy if"?

Georg
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