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>
Currently compton handles window creation event by immediately query all
the information it needs and create a window struct with that
information. However, this is prone to race conditions.
In the future, we want to react to window creation event by creating a
placeholder in the window stack, and only query window information in a
critical section where the X server is grabbed by us.
This commit split struct win into two struct, one as placeholder, the
other for holding actual window information.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
