Avoid using memcpy() to copy structs

We can just use a regular assignment instead. This is more
type-safe since there is no need to provide the struct size.

The remaining memcpy() calls perform array copies or copies from
void pointers (which may be unaligned).

render/allocator/drm_dumb.c

@@ -129,7 +129,7 @@ static void drm_dumb_buffer_end_data_ptr_access(struct wlr_buffer *wlr_buffer) {
 static bool buffer_get_dmabuf(struct wlr_buffer *wlr_buffer,
 		struct wlr_dmabuf_attributes *attribs) {
 	struct wlr_drm_dumb_buffer *buf = drm_dumb_buffer_from_buffer(wlr_buffer);
-	memcpy(attribs, &buf->dmabuf, sizeof(buf->dmabuf));
+	*attribs = buf->dmabuf;
 	return true;
 }
 

render/allocator/gbm.c

@@ -79,7 +79,7 @@ static bool export_gbm_bo(struct gbm_bo *bo,
 		attribs.stride[i] = gbm_bo_get_stride_for_plane(bo, i);
 	}
 
-	memcpy(out, &attribs, sizeof(attribs));
+	*out = attribs;
 	return true;
 
 error_fd:
@@ -168,7 +168,7 @@ static bool buffer_get_dmabuf(struct wlr_buffer *wlr_buffer,
 		struct wlr_dmabuf_attributes *attribs) {
 	struct wlr_gbm_buffer *buffer =
 		get_gbm_buffer_from_buffer(wlr_buffer);
-	memcpy(attribs, &buffer->dmabuf, sizeof(buffer->dmabuf));
+	*attribs = buffer->dmabuf;
 	return true;
 }
 

render/allocator/shm.c

@@ -31,7 +31,7 @@ static void buffer_destroy(struct wlr_buffer *wlr_buffer) {
 static bool buffer_get_shm(struct wlr_buffer *wlr_buffer,
 		struct wlr_shm_attributes *shm) {
 	struct wlr_shm_buffer *buffer = shm_buffer_from_buffer(wlr_buffer);
-	memcpy(shm, &buffer->shm, sizeof(*shm));
+	*shm = buffer->shm;
 	return true;
 }
 

render/dmabuf.c

@@ -15,7 +15,7 @@ void wlr_dmabuf_attributes_finish(struct wlr_dmabuf_attributes *attribs) {
 
 bool wlr_dmabuf_attributes_copy(struct wlr_dmabuf_attributes *dst,
 		const struct wlr_dmabuf_attributes *src) {
-	memcpy(dst, src, sizeof(struct wlr_dmabuf_attributes));
+	*dst = *src;
 
 	int i;
 	for (i = 0; i < src->n_planes; ++i) {

types/wlr_compositor.c

@@ -330,7 +330,7 @@ static void surface_state_move(struct wlr_surface_state *state,
 		pixman_region32_copy(&state->input, &next->input);
 	}
 	if (next->committed & WLR_SURFACE_STATE_VIEWPORT) {
-		memcpy(&state->viewport, &next->viewport, sizeof(state->viewport));
+		state->viewport = next->viewport;
 	}
 	if (next->committed & WLR_SURFACE_STATE_FRAME_CALLBACK_LIST) {
 		wl_list_insert_list(&state->frame_callback_list,

types/wlr_linux_dmabuf_v1.c

@@ -111,7 +111,7 @@ static bool buffer_get_dmabuf(struct wlr_buffer *wlr_buffer,
 		struct wlr_dmabuf_attributes *attribs) {
 	struct wlr_dmabuf_v1_buffer *buffer =
 		dmabuf_v1_buffer_from_buffer(wlr_buffer);
-	memcpy(attribs, &buffer->attributes, sizeof(buffer->attributes));
+	*attribs = buffer->attributes;
 	return true;
 }