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By pointing Cairo at the mmap-ed file used to create wl_shm buffers, we
can eliminate a memcpy() on every draw, providing a decent speedup
(especially for large window sizes).
This comes at the expense of having to keep track of two Cairo contexts,
one for each of our two buffers used for double buffering. Additionally,
a single memcpy() is still required for initialisation of the second
buffer, so the startup latency isn't affected much.
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eglInitialize() is slow (~50-100ms), and uses a fair amount of memory
(~100 MB). For such a small, simple program that just wants to launch as
quickly as possible, wl_shm performs better.
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This implements a rofi-like run cache. Other smaller changes include
simplification of resize logic now that there's only one surface.
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Also fix some memory leaks.
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