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shm: purge unused buffers

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When we need to create a new buffer (because the cache doesn't have
any buffers of correct size, or because they're all busy), purge
buffers with a size mismatch.
This commit is contained in:
Daniel Eklöf 2019-11-02 00:35:02 +01:00
parent 00b46455a0
commit 5812242405
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GPG key ID: 5BBD4992C116573F
1 changed files with 28 additions and 7 deletions
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35
shm.c
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@ -17,6 +17,15 @@
static tll(struct buffer) buffers;
static void
buffer_destroy(struct buffer *buf)
{
if (buf->pix != NULL)
pixman_image_unref(buf->pix);
wl_buffer_destroy(buf->wl_buf);
munmap(buf->mmapped, buf->size);
}
static void
buffer_release(void *data, struct wl_buffer *wl_buffer)
{
@ -48,6 +57,24 @@ shm_get_buffer(struct wl_shm *shm, int width, int height, unsigned long cookie)
}
}
/* Purge old buffers associated with this cookie */
tll_foreach(buffers, it) {
if (it->item.cookie != cookie)
continue;
if (it->item.busy)
continue;
if (it->item.width == width && it->item.height == height)
continue;
LOG_DBG("cookie=%lx: purging buffer (width=%d, height=%d)",
cookie, it->item.width, it->item.height);
buffer_destroy(&it->item);
tll_remove(buffers, it);
}
/*
* No existing buffer available. Create a new one by:
*
@ -151,13 +178,7 @@ void
shm_fini(void)
{
tll_foreach(buffers, it) {
struct buffer *buf = &it->item;
if (buf->pix != NULL)
pixman_image_unref(buf->pix);
wl_buffer_destroy(buf->wl_buf);
munmap(buf->mmapped, buf->size);
buffer_destroy(&it->item);
tll_remove(buffers, it);
}
}