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buffer: reduce unnecessary painting to new cairo surfaces

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Add buffer_adopt_cairo_surface(), which allows wrapping an existing
cairo image surface in a struct lab_data_buffer. This is useful when
loading PNGs since most will be loaded as ARGB32 already.

Fix a memory leak in the non-ARGB32 PNG case, where we do still need to
paint to a new image surface -- we were leaking the original surface.

Eliminate an unnecessary temporary image surface in SVG loading and just
render the SVG to the image surface held by the lab_data_buffer.

I also cleaned up and clarified the buffer API a bit:

- Add a pointer to the held cairo_surface_t (so we can still access it
  if there is no cairo_t).
- Remove the free_on_destroy bool (it was always true).
- Rename unscaled_width/height to logical_width/height and add an
  explanatory comment. It was unclear what "unscaled" meant.
- Rename buffer_create_wrap() to buffer_create_from_data().

This is laying groundwork for some more icon fixes I am working on
(making sure icons are loaded and rendered at the correct scale).
This commit is contained in:
John Lindgren 2024-10-06 01:42:54 -04:00 • committed by Johan Malm
parent 328f873db3
commit d2b161bdf8
14 changed files with 123 additions and 84 deletions
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2
src/osd.c
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@ -351,7 +351,7 @@ display_osd(struct output *output, struct wl_array *views)
if (output->osd_buffer) {
wlr_buffer_drop(&output->osd_buffer->base);
}
output->osd_buffer = buffer_create_cairo(w, h, scale, true);
output->osd_buffer = buffer_create_cairo(w, h, scale);
if (!output->osd_buffer) {
wlr_log(WLR_ERROR, "Failed to allocate cairo buffer for the window switcher");
return;