buffer: add data_ptr access flags

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.

2 files changed, 2 insertions, 2 deletions

diff --git a/render/allocator/drm_dumb.c b/render/allocator/drm_dumb.c
index ea982a03..170d9c33 100644
--- a/render/allocator/drm_dumb.c
+++ b/render/allocator/drm_dumb.c
@@ -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;
diff --git a/render/allocator/shm.c b/render/allocator/shm.c
index 7b32cf8d..77054dbe 100644
--- a/render/allocator/shm.c
+++ b/render/allocator/shm.c
@@ -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;