This function is getting called a lot. Statistics for the gtk3-demo
listbox example show most calls with 0-4 classes. Unrolling the cases
a bit brings the instruction count in callgrind from 93M to 52M.
The same trick that was applied to _gtk_css_change_for_child in
the previous commit can be applied to _gtk_css_change_for_sibling
as well, and that is what this commit does.
With both functions converted, gtk_css_change_translate is no
longer needed and gets dropped.
The function to translate GtkCssChange enum values to the PARENT
ones is called very frequently. This patch speeds it up tremendously.
The callgrind instruction count for this function in the listbox
demo goes from 108M to 7M.
My statistics show that more than half of all calls end up
with 0 matches, so we can avoid some overhead by not allocating
an array at all in this case.
We are dealing with really short lists here.
95% are < 10 matches, and the longest I've been able to record was 19.
So just do away with the hash table and do sorted insertion in
the array directly.
Otherwise the outer loop control variable is messed up, and we end
up with uninitialized axes if there were any more valuators after
the XIKeyClass one.
This bug was sneakily introduced by fdb9a8e14, many thanks to
Carlos Soriano for helping spot the source of this bug.
https://bugzilla.gnome.org/show_bug.cgi?id=753431
The logic here is that G_ENABLE_DEBUG is for compiling out
debug spew that can be triggered at runtime with the GTK_DEBUG
environment variable, while G_ENABLE_CONSISTENCY_CHECKS is for
consistency checks that are applied unconditionally.
Use a separate G_ENABLE_CONSISTENCY_CHECKS define to guard internal
consistency checks that are applied unconditionally if they are enabled,
such as the widget invariants checking. Interactive debug spew that can
be triggered at runtime with the GTK_DEBUG environment variable is still
guarded by the G_ENABLE_DEBUG define.
The mapping from enable-debug levels to defines is as follows:
yes: G_ENABLE_DEBUG G_ENABLE_CONSISTENCY_CHECKS
minimum: G_ENABLE_DEBUG G_DISABLE_CAST_CHECKS
no: G_DISABLE_CAST_CHECKS G_DISABLE_ASSERT G_DISABLE_CHECKS
