When a window has 0 opacity, it's rendering is skipped completely. Thus
its background isn't blurred.
This commit fixes that.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
Dummy backends are backends that doesn't render anything on to the
screen or the target window. But they are still be useful for debug
purposes, and can be useful for other things too.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
Only render blur with transparency when window is fading in/out.
Otherwise, a window with a set opacity will always have a completely
blurred background.
Fixes#198
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
There were still some artifacts left when multiple semi-transparent
windows are stacked on top of each other.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
Instead of rendering into the back buffer, render into a intermediate
texture.
This is a preparation for partial screen updating, which is necessary to
eliminate artifacts visible when using blur and use-damage together.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
Doing this forces compton to blur every windows' background.
However, doing this can be beneficial, we will figure out a way
to do this properly in the future.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
Previously, only the WM windows (window manager usually reparents the
application windows under its own window so it can manage them) are
checked for alpha channels. Some of the window managers (e.g. awesome)
acquire alpha channels for all of the WM windows, whether the underlying
application windows have alpha channel or not.
With this change, the application windows are also checked for alpha
channels. If a WM window has alpha but its child doesn't, only the WM
frame will be considered to be semi-transparent. Thus preventing some
unnecessary blurring.
Closes#191
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
This is done by extending the blur area internally when process
blurring.
Ping: #50, cause this fixes that problem but only when using the
experiemental backends.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
When enabled, the result will be redirected to a window, and compton
won't take over the screen.
Makes debugging easier.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
To prepare for different blur methods, the blur interface of backends
has been splitted into two parts.
Now to use blur, a blur context must be created first; then, the blur
method should be called with the blur context created.
Updated the existing backends to the new interface. Also implemented
handling of the new blur options.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
Also fill the center of parsed kernel with 1. This shouldn't change the
behavior of the old backends since they will modify the center of the
kernels.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
glGetIntegerv(GL_NUM_EXTENSIONS) is only available since GL4.
(However glGetStringi(GL_EXTENSIONS) is available since GL3)
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
