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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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15
render/pixman/renderer.c
View file

@ -96,7 +96,9 @@ static struct wlr_pixman_buffer *create_buffer(
void *data = NULL;
uint32_t drm_format;
size_t stride;
if (!buffer_begin_data_ptr_access(wlr_buffer, &data, &drm_format, &stride)) {
if (!buffer_begin_data_ptr_access(wlr_buffer,
WLR_BUFFER_DATA_PTR_ACCESS_READ | WLR_BUFFER_DATA_PTR_ACCESS_WRITE,
&data, &drm_format, &stride)) {
wlr_log(WLR_ERROR, "Failed to get buffer data");
goto error_buffer;
}
@ -143,7 +145,9 @@ static void pixman_begin(struct wlr_renderer *wlr_renderer, uint32_t width,
void *data = NULL;
uint32_t drm_format;
size_t stride;
buffer_begin_data_ptr_access(buffer->buffer, &data, &drm_format, &stride);
buffer_begin_data_ptr_access(buffer->buffer,
WLR_BUFFER_DATA_PTR_ACCESS_READ | WLR_BUFFER_DATA_PTR_ACCESS_WRITE,
&data, &drm_format, &stride);
// If the data pointer has changed, re-create the Pixman image. This can
// happen if it's a client buffer and the wl_shm_pool has been resized.
@ -229,8 +233,8 @@ static bool pixman_render_subtexture_with_matrix(
void *data;
uint32_t drm_format;
size_t stride;
if (!buffer_begin_data_ptr_access(texture->buffer, &data, &drm_format,
&stride)) {
if (!buffer_begin_data_ptr_access(texture->buffer,
WLR_BUFFER_DATA_PTR_ACCESS_READ, &data, &drm_format, &stride)) {
return false;
}
@ -376,7 +380,8 @@ static struct wlr_texture *pixman_texture_from_buffer(
void *data = NULL;
uint32_t drm_format;
size_t stride;
if (!buffer_begin_data_ptr_access(buffer, &data, &drm_format, &stride)) {
if (!buffer_begin_data_ptr_access(buffer, WLR_BUFFER_DATA_PTR_ACCESS_READ,
&data, &drm_format, &stride)) {
return NULL;
}
buffer_end_data_ptr_access(buffer);