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buffer: replace get_data_ptr with {begin,end}_data_ptr_access

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This new API allows buffer implementations to know when a user is
actively accessing the buffer's underlying storage. This is
important for the upcoming client-backed wlr_buffer implementation.
This commit is contained in:
Simon Ser 2021-06-02 17:02:28 +02:00 • committed by Simon Zeni
parent 9e58301df7
commit 38ba5881a0
7 changed files with 79 additions and 18 deletions
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22
types/wlr_buffer.c
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@ -12,6 +12,9 @@
void wlr_buffer_init(struct wlr_buffer *buffer,
const struct wlr_buffer_impl *impl, int width, int height) {
assert(impl->destroy);
if (impl->begin_data_ptr_access || impl->end_data_ptr_access) {
assert(impl->begin_data_ptr_access && impl->end_data_ptr_access);
}
buffer->impl = impl;
buffer->width = width;
buffer->height = height;
@ -24,6 +27,8 @@ static void buffer_consider_destroy(struct wlr_buffer *buffer) {
return;
}
assert(!buffer->accessing_data_ptr);
wlr_signal_emit_safe(&buffer->events.destroy, NULL);
buffer->impl->destroy(buffer);
@ -67,12 +72,23 @@ bool wlr_buffer_get_dmabuf(struct wlr_buffer *buffer,
return buffer->impl->get_dmabuf(buffer, attribs);
}
bool buffer_get_data_ptr(struct wlr_buffer *buffer, void **data,
bool buffer_begin_data_ptr_access(struct wlr_buffer *buffer, void **data,
uint32_t *format, size_t *stride) {
if (!buffer->impl->get_data_ptr) {
assert(!buffer->accessing_data_ptr);
if (!buffer->impl->begin_data_ptr_access) {
return false;
}
return buffer->impl->get_data_ptr(buffer, data, format, stride);
if (!buffer->impl->begin_data_ptr_access(buffer, data, format, stride)) {
return false;
}
buffer->accessing_data_ptr = true;
return true;
}
void buffer_end_data_ptr_access(struct wlr_buffer *buffer) {
assert(buffer->accessing_data_ptr);
buffer->impl->end_data_ptr_access(buffer);
buffer->accessing_data_ptr = false;
}
bool wlr_buffer_get_shm(struct wlr_buffer *buffer,