Gyan Doshi
1c76134fe3
avfilter/drawbox+drawgrid - add option to prevent overwriting of source pixels ...
If the user-supplied color in drawbox and drawgrid filters is non-opaque,
the box & grid painting overwrites the input's pixels (including alpha).
Users typically expect the alpha of the specified color to only act as a key
for compositing on top of the main input.
Added option allows users to select between replacement and composition.
Tested and documented.
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1c76134fe3