Add a function for converting a single color from one
color state to another. This is a generalization of the
already existing function to convert a GdkRGBA to another
color state.
This is an old test that isn't very relevant anymore, and it has
some linking problems because it includes private headers that
have inlined functions.
We want to reuse gsk_gpu_color_to_float() for use with GdkColor and this
function will be replaced. But until that's fully done, we need 2
different names.
So rename this one to something else
The outlook for mutter supporting this in GNOME 47 are cloudy,
so lets flip the switch back. You can still set
USE_POINTER_VIEWPORT in the environment to try this code.
It turns out the "step" variable could up as 0 when p.y ~= 3.0 ||
p.y ~= r.y - 3.0
That was not enough to trigger it though because if "start" and "end"
were the same value, the "y <= end" check in the loop would immediately
terminate it.
However, if start + epsilon == end so that end != start but (end - start)
/ 7 == 0, then step would end up as 0 and the loop would never
terminate.
And if that happened, it would bring down GPUs.
So recode this whole machinery to make it impossible to infloop.
Fixes#6896
The fix in commit 5e7f227d broke shadows while trying to make them
faster.
So use a better way to make them faster.
With the normalized blur radius, we can now conclude that all the values
too far from p.y will cause the gauss() call to return close to 0, so we
can skip any y value that is too far from p.y.
And that allows us to put an upper limit on the loop iterations.
Tests included
Fixes#6888
Instead of doing complicated math, normalize the values to a sigma
of 1.0, and then use that.
This should also be beneficial for shader performance, because 1.0 is a
constant and constant-elimination can kick in on the inlined functions.
When the compositor sends us an image description, we currently happily
reuse it.
However, those image descriptions may contain optional properties that
we do not handle - example: reference white level. So if we were to
reuse that image description, we would set a wrong reference white
level.
To avoid issues like that, never use compositor-provided image
descriptions.
However, query those image descriptions and map them to the closest
GdkColorState, so that we can quickly look up *our* version of that
image description and use that one.
When finalizing a subsurface, we need to make sure it is removed
from the sibling lists in its parent, or bad things will happen.
This should crashes seen in Epiphany nightly.
Fixes: #6891
convert_func2 is a 'from' conversion function, ie it expects to
be passed the target color state. This was wrong both in
gdk_memory_convert and gdk_memory_convert_color_state.
