Filter to use when scaling images

Available options are:

Nearest | Bilinear | CatmullRom | Mitchell | Lanczos3

These are offered by the fast_image_resize crate (https://docs.rs/fast_image_resize/2.5.0/fast_image_resize/). Nearest is what I recommend for pixel art stuff, and ONLY for pixel art stuff. It is also the fastest filter.

For non pixel art stuff, I would usually recommend one of the last three, though some experimentation will be necessary to see which one you like best.

Note you can also pass the flag --no-resize, explained below. In which case the --filter flag will have no effect.

Default is Lanczos3.

Do not resize the image. Equivalent to --resize no.

If this is set, the image won't be resized, and will be centralized in the middle of the screen instead. If it is smaller than the screen's size, it will be padded with the value of --fill_color, below.

Whether to resize the image and the method by which to resize it.

Possible values:

Default is crop.

Which color to fill the padding with when not resizing.

Default is 000000.

Comma separated list of outputs to display the image at. Use swww query to know which outputs are currently being used.

If it isn't set, the image is displayed on all outputs.

[Environment Variable $SWWW_TRANSITION]

Sets the type of transition. Default is simple, that fades into the new image.

Possible transitions are:

none is an alias to simple, that also sets the transition-step to 255. This has the effect of the transition completing instantly.

fade is like simple but uses bezier curves while fading the image, its a more polished looking version of simple with less artifacts

The left, right, top and bottom options make the transition happen from that position to its opposite in the screen.

wipe is similar to left but allows you to specify the angle for transition with the `--transition-angle` flag.

wave is similar to wipe but the sweeping line is wavy. You can control the "waviness" with `--transition-wave`.

grow causes a growing circle to transition across the screen and allows changing the circle's center position with the `--transition-pos` flag.

center is an alias to grow with position set to center of screen.

any is an alias to grow with position set to a random point on screen.

outer is the same as grow but the circle shrinks instead of growing.

Finally, random will select a transition effect at random

[Environment Variable $SWWW_TRANSITION_STEP]

How fast the transition approaches the new image.

The transition logic works by adding or subtracting from the current rgb values until the old image transforms in the new one. This controls by how much we add or subtract.

For example, if pixel A is 000010, and we need it to transition to pixel B, which is 000020, if transition-step is 2, then in one frame pixel A will turn to 000012, in the next frame to 000014, and so on.

Larger values will make the transition faster, but more abrupt. A value of 255 will always switch to the new image immediately.

Default is 90. If transition-type is simple, default is 2.

[Environment Variable $SWWW_TRANSITION_DURATION]

How long the transition takes to complete, in seconds.

Note this doesn't work with the simple transition.

Default is 3.

[Environment Variable: $SWWW_TRANSITION_FPS]

Frame rate for the transition effect.

Note there is no point in setting this to a value smaller than what your monitor supports.

Also note this is different from the transition-step. That one controls by how much we approach the new image every frame.

Default is 30.

[Environment Variable: SWWW_TRANSITION_ANGLE]

This is used for the wipe and wave transitions. It controls the angle of the wipe.

Note that the angle is in degrees, where '0' is right to left and '90' is top to bottom, and '270' bottom to top

Default is 45.

[Environment Variable: SWWW_TRANSITION_POS]

This is only used for the grow and outer transitions. It controls the center of circle (default is center).

Position values can be given in both percentage values and pixel values: float values are interpreted as percentages and integer values as pixel values. Eg.: 0.5,0.5 means 50% of the screen width and 50% of the screen height, while 200,400 means 200 pixels from the left and 400 pixels from the bottom.

The value can also be an alias which will set the position accordingly:

Default is center.

[Environment Variable: SWWW_INVERT_Y]

inverts the y position sent in `transiiton_pos` flag

[Environment Variable: SWWW_TRANSITION_BEZIER]

Bezier curve to use for the transition animation. https://cubic-bezier.com is a good website to get these values from.

eg: 0.0,0.0,1.0,1.0 for linear animation

Default is .54,0,.34,.99

[Environment Variable: SWWW_TRANSITION_WAVE]

Currently only used for wave transition to control the width and height of each wave.

Default is : 20,20

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