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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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4
include/wlr/types/wlr_buffer.h
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@ -30,8 +30,8 @@ struct wlr_buffer_impl {
struct wlr_dmabuf_attributes *attribs);
bool (*get_shm)(struct wlr_buffer *buffer,
struct wlr_shm_attributes *attribs);
bool (*begin_data_ptr_access)(struct wlr_buffer *buffer, void **data,
uint32_t *format, size_t *stride);
bool (*begin_data_ptr_access)(struct wlr_buffer *buffer, uint32_t flags,
void **data, uint32_t *format, size_t *stride);
void (*end_data_ptr_access)(struct wlr_buffer *buffer);
};