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buffer: add data_ptr access flags

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This allows callers to specify the operations they'll perform on
the returned data pointer. The motivations for this are:

- The upcoming Linux MAP_NOSIGBUS flag may only be usable on
  read-only mappings.
- gbm_bo_map with GBM_BO_TRANSFER_READ hurts performance.
This commit is contained in:
Simon Ser 2021-06-29 17:08:32 +02:00 • committed by Simon Zeni
parent 105fdecd0c
commit 4e7a8707cc
7 changed files with 46 additions and 22 deletions
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2
render/allocator/drm_dumb.c
View file

@ -128,7 +128,7 @@ create_err:
}
static bool drm_dumb_buffer_begin_data_ptr_access(struct wlr_buffer *wlr_buffer,
void **data, uint32_t *format, size_t *stride) {
uint32_t flags, void **data, uint32_t *format, size_t *stride) {
struct wlr_drm_dumb_buffer *buf = drm_dumb_buffer_from_buffer(wlr_buffer);
*data = buf->data;
*stride = buf->stride;

2
render/allocator/shm.c
View file

@ -31,7 +31,7 @@ static bool buffer_get_shm(struct wlr_buffer *wlr_buffer,
}
static bool shm_buffer_begin_data_ptr_access(struct wlr_buffer *wlr_buffer,
void **data, uint32_t *format, size_t *stride) {
uint32_t flags, void **data, uint32_t *format, size_t *stride) {
struct wlr_shm_buffer *buffer = shm_buffer_from_buffer(wlr_buffer);
*data = buffer->data;
*format = buffer->shm.format;