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Instead of creating a graphics context for every surface_t, this commit adds a cache that allows to "remember" up to two GCs. Thus, the code uses less GCs. When a GC from the cache can be used, this also gets rid of a round-trip to the X11 server. Both of these are tiny, insignificant savings, but so what? Since GCs are per-depth, this code needs access to get_visual_depth(). To avoid a code duplication, this function is moved to libi3. Fixes: https://github.com/i3/i3/issues/3478 Signed-off-by: Uli Schlachter <psychon@znc.in>
Introduction ============ libi3 is an *INTERNAL* library which contains functions that i3 and related tools (i3-msg, i3-input, i3-nagbar, i3-config-wizard, i3bar) use. It is NOT to be used by other programs. Structure ========= Every function gets its own .c file, which in turn gets compiled into an .o object file. Afterwards, all .o files are archived into one static library (libi3.a). This library will be linked into all i3 binaries. The linker is able to eliminate unused .o files when linking, so only the functions which you actually use will be included in the corresponding binary.