linux-pipewire: Clear cursor texture on empty bitmap

If we receive an empty cursor bitmap - one without valid size - we
should hide the cursor. Do so by clearing the texture.

This fixes visible cursors when recording various games with Wayland
compositors.

Closes #4895

plugins/linux-pipewire/pipewire.c

@@ -719,27 +719,33 @@ static void on_process_cb(void *user_data)
 			bitmap = SPA_MEMBER(cursor, cursor->bitmap_offset,
 					    struct spa_meta_bitmap);
 
-		if (bitmap && bitmap->size.width > 0 &&
-		    bitmap->size.height > 0 &&
-		    lookup_format_info_from_spa_format(
-			    bitmap->format, NULL, &gs_format, &swap_red_blue)) {
-			const uint8_t *bitmap_data;
-
-			bitmap_data =
-				SPA_MEMBER(bitmap, bitmap->offset, uint8_t);
-			obs_pw->cursor.hotspot_x = cursor->hotspot.x;
-			obs_pw->cursor.hotspot_y = cursor->hotspot.y;
-			obs_pw->cursor.width = bitmap->size.width;
-			obs_pw->cursor.height = bitmap->size.height;
-
+		if (bitmap) {
 			g_clear_pointer(&obs_pw->cursor.texture,
 					gs_texture_destroy);
-			obs_pw->cursor.texture = gs_texture_create(
-				obs_pw->cursor.width, obs_pw->cursor.height,
-				gs_format, 1, &bitmap_data, GS_DYNAMIC);
 
-			if (swap_red_blue)
-				swap_texture_red_blue(obs_pw->cursor.texture);
+			if (bitmap->size.width > 0 && bitmap->size.height > 0 &&
+			    lookup_format_info_from_spa_format(
+				    bitmap->format, NULL, &gs_format,
+				    &swap_red_blue)) {
+				const uint8_t *bitmap_data;
+
+				bitmap_data = SPA_MEMBER(bitmap, bitmap->offset,
+							 uint8_t);
+				obs_pw->cursor.hotspot_x = cursor->hotspot.x;
+				obs_pw->cursor.hotspot_y = cursor->hotspot.y;
+				obs_pw->cursor.width = bitmap->size.width;
+				obs_pw->cursor.height = bitmap->size.height;
+
+				obs_pw->cursor.texture = gs_texture_create(
+					obs_pw->cursor.width,
+					obs_pw->cursor.height, gs_format, 1,
+					&bitmap_data, GS_DYNAMIC);
+
+				if (swap_red_blue) {
+					swap_texture_red_blue(
+						obs_pw->cursor.texture);
+				}
+			}
 		}
 
 		obs_pw->cursor.x = cursor->position.x;