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docs: clarify how the window-*-before variables work

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Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
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Yuxuan Shui 2024-08-12 07:10:26 +01:00
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man/picom.1.adoc
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@ -739,11 +739,13 @@ Currently, these context variables are defined: :::
_window-width_, _window-height_:: The size of the window.
_window-x-before_, _window-y-before_, _window-width-before_, _window-height-before_:: The size and coordinates of the window before the animation is triggered. This is only meaningfully different from the normal window geometry variables for the _geometry_ trigger.
_window-x-before_, _window-y-before_, _window-width-before_, _window-height-before_:: The size and coordinates of the window from the previous frame. This is only meaningfully different from the normal window geometry variables inside animations triggered by the _geometry_ trigger.
_window-monitor-x_, _window-monitor-y_, _window-monitor-width_, _window-monitor-height_:: Defines the rectangle which reflects the monitor the window is on. If the window is not fully contained in any monitor, the rectangle will reflect the entire virtual screen.
_window-raw-opacity-before_, _window-raw-opacity_:: Animation triggers are usually accompanied by a change in the window's opacity. For example, when a window is opened, its opacity changes from 0 to 1. These two variables reflect the opacity of the window before and after the animation is triggered. They are useful if you want to smoothly transition the window's opacity.
_window-raw-opacity-before_, _window-raw-opacity_:: Animation triggers are usually accompanied by a change in the window's opacity. For example, when a window is opened, its opacity changes from 0 to 1. These two variables reflect the opacity of the window for the previous and current frame. They are useful if you want to smoothly transition the window's opacity.
IMPORTANT: All of the _window-*-before_ variables are updated every frame, and reflects the state of the window in the previous frame. Which means they will only be meaningful for a single frame, when an animation has just been triggered. Which means you should only use them to define the _start_, _end_, or _delay_ values of a timing function, since these values are only evaluated once when the animation starts.
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