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c7a2646bc7
To be able to reuse colors from the original frame, the last value returned by
`p()` is tracked in the eval state, and if it is assigned to a variable, the
original color components are copied to `color_vars`. Thus, commands like
`setcolor` and `colorstop` can use those variables:
setvar pixel (p(0, 0))
...
setcolor pixel
`fate-filter-drawvg-video` now also verifies the `p()` function.
Signed-off-by: Ayose <ayosec@gmail.com>