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Niklas Haas authored
The current behavior is very ad-hoc and presents numerous issues to downstream clients. Make this configuration process more straightforward by adding an explicit clearing mode enum field to `pl_render_params`, which the old override fields are specific instances of. Notably, this could be extended in the future, e.g. by PL_CLEAR_GRADIENT or whatever. (Although this can already be done as of right now by setting both clear modes to PL_CLEAR_NONE and using blend_params on top of a custom-drawn gradient) The default of `PL_COLOR_CLEAR` for both is consistent with the current status quo, and also presents the least surprising outcome when combining transparent/opaque images with transparent/opaque framebuffers. This way, the user only gets transparent images output if they explicitly opt-in to it, either by setting `background_transparency` to 1 (like `plplay` does), or by setting the background clearing mode to `PL_CLEAR_SKIP`. In particular, `border ...
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