Add back wlr_buffer

This reverts commit d27eeaa14c9a35c709f09de862aa6d4f0ef9ff83.

2 files changed, 57 insertions, 0 deletions

diff --git a/include/wlr/types/wlr_buffer.h b/include/wlr/types/wlr_buffer.h
new file mode 100644
index 00000000..fc348a1c
--- /dev/null
+++ b/include/wlr/types/wlr_buffer.h
@@ -0,0 +1,56 @@
+#ifndef WLR_TYPES_WLR_BUFFER_H
+#define WLR_TYPES_WLR_BUFFER_H
+
+#include <pixman.h>
+#include <wayland-server.h>
+
+/**
+ * A client buffer.
+ */
+struct wlr_buffer {
+	struct wl_resource *resource; // can be NULL
+	struct wlr_texture *texture; // can be NULL
+	bool released;
+	size_t n_refs;
+
+	struct wl_listener resource_destroy;
+};
+
+struct wlr_renderer;
+
+/**
+ * Check if a resource is a wl_buffer resource.
+ */
+bool wlr_resource_is_buffer(struct wl_resource *resource);
+/**
+ * Get the size of a wl_buffer resource.
+ */
+bool wlr_buffer_get_resource_size(struct wl_resource *resource,
+	struct wlr_renderer *renderer, int *width, int *height);
+
+/**
+ * Upload a buffer to the GPU and reference it.
+ */
+struct wlr_buffer *wlr_buffer_create(struct wlr_renderer *renderer,
+	struct wl_resource *resource);
+/**
+ * Reference the buffer.
+ */
+struct wlr_buffer *wlr_buffer_ref(struct wlr_buffer *buffer);
+/**
+ * Unreference the buffer. After this call, `buffer` may not be accessed
+ * anymore.
+ */
+void wlr_buffer_unref(struct wlr_buffer *buffer);
+/**
+ * Try to update the buffer's content. On success, returns the updated buffer
+ * and destroys the provided `buffer`. On error, `buffer` is intact and NULL is
+ * returned.
+ *
+ * Fails if there's more than one reference to the buffer or if the texture
+ * isn't mutable.
+ */
+struct wlr_buffer *wlr_buffer_apply_damage(struct wlr_buffer *buffer,
+	struct wl_resource *resource, pixman_region32_t *damage);
+
+#endif
diff --git a/include/wlr/types/wlr_surface.h b/include/wlr/types/wlr_surface.h
index 526e4e2c..64503e78 100644
--- a/include/wlr/types/wlr_surface.h
+++ b/include/wlr/types/wlr_surface.h
@@ -69,6 +69,7 @@ struct wlr_subsurface {
 struct wlr_surface {
 	struct wl_resource *resource;
 	struct wlr_renderer *renderer;
+	struct wlr_buffer *buffer;
 	struct wlr_texture *texture;
 	struct wlr_surface_state *current, *pending;
 	const char *role; // the lifetime-bound role or null