1 files changed, 29 insertions, 0 deletions
diff --git a/types/buffer/buffer.c b/types/buffer/buffer.c
new file mode 100644
index 0000000..d4c47bc
--- /dev/null
+++ b/types/buffer/buffer.c
@@ -0,0 +1,29 @@
+#include "render/pixel_format.h"
+#include "types/wlr_buffer.h"
+
+bool buffer_is_opaque(struct wlr_buffer *buffer) {
+  void *data;
+  uint32_t format;
+  size_t stride;
+  struct wlr_dmabuf_attributes dmabuf;
+  struct wlr_shm_attributes shm;
+  if (wlr_buffer_get_dmabuf(buffer, &dmabuf)) {
+    format = dmabuf.format;
+  } else if (wlr_buffer_get_shm(buffer, &shm)) {
+    format = shm.format;
+  } else if (wlr_buffer_begin_data_ptr_access(buffer,
+                                              WLR_BUFFER_DATA_PTR_ACCESS_READ,
+                                              &data, &format, &stride)) {
+    wlr_buffer_end_data_ptr_access(buffer);
+  } else {
+    return false;
+  }
+
+  const struct wlr_pixel_format_info *format_info =
+      drm_get_pixel_format_info(format);
+  if (format_info == NULL) {
+    return false;
+  }
+
+  return !format_info->has_alpha;
+}