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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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Another source of slow startup is initialising Pango. If the user
supplies a ttf file, we can skip any Pango stuff and use Harfbuzz
directly with Cairo to do our font rendering, providing a large speedup.
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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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- Remove the background image and libpng dependency
- Add a prompt
- Add xmalloc with out-of-memory handling
- Add beginnings of a rofi-like run cache
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The subsurface was playing havoc with layer shell stuff, and I don't
think any potential efficiency gain is worth the complicated code to
work out how big the subsurface should be. Instead, the entry code now
just draws directly onto the main surface.
Damage information should be passed to glTexSubImage2D() in future, to
avoid redrawing the entire window every keypress.
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Initialising Pango makes up a large portion of the startup time, and we
can achieve neater rendering with pure Cairo if we're just drawing
circles anyway. Therefore, this commit avoids loading Pango if no
options which require it are specified (such as --font-name or
--password-character). This reduces startup time with no background
image to ~40ms on my machine (2015 MacBook Pro).
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Also fix some memory leaks.
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Useable, but very barebones — not even any error message reporting.
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