diff --git a/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx b/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx index 285367a2101edb9fc2e69a6d36c77a1b13e9fff2..89ab3fa929cd81da60b904e77c28d4b026de5128 100644 --- a/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx +++ b/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx @@ -1786,6 +1786,12 @@ struct xid_and_rect { }; +static void surface_frame_done(void *data, struct wl_callback *cb, uint32_t time); + +static const struct wl_callback_listener surface_frame_listener = { + .done = surface_frame_done, +}; + static void surface_frame_done(void *data, struct wl_callback *cb, uint32_t time) { struct xid_and_rect *xid_rect = (xid_and_rect *)data; wl_callback_destroy(cb); @@ -1795,16 +1801,28 @@ static void surface_frame_done(void *data, struct wl_callback *cb, uint32_t time xid_rect->win->redraw(); } else { xid_rect->win->Fl_Widget::resize(xid_rect->X, xid_rect->Y, xid_rect->W, xid_rect->H); + if (xid_rect->xid->buffer && xid_rect->xid->buffer->draw_buffer_needs_commit) { + // for scenarios where the child window is moved and its parent is simultaneously modified + cairo_surface_t *surf = cairo_get_target(xid_rect->xid->buffer->draw_buffer.cairo_); + cairo_surface_flush(surf); + xid_rect->xid->buffer->draw_buffer_needs_commit = false; + memcpy(xid_rect->xid->buffer->data, xid_rect->xid->buffer->draw_buffer.buffer, + xid_rect->xid->buffer->draw_buffer.data_size); + wl_surface_damage_buffer(xid_rect->xid->wl_surface, 0, 0, 1000000, 1000000); + xid_rect->xid->buffer->in_use = true; + wl_surface_attach(xid_rect->xid->wl_surface, xid_rect->xid->buffer->wl_buffer, 0, 0); + wl_surface_set_buffer_scale( xid_rect->xid->wl_surface, + Fl_Wayland_Window_Driver::driver(xid_rect->xid->fl_win)->wld_scale() ); + xid_rect->xid->frame_cb = wl_surface_frame(xid_rect->xid->wl_surface); + wl_callback_add_listener(xid_rect->xid->frame_cb, &surface_frame_listener, xid_rect); + wl_surface_commit(xid_rect->xid->wl_surface); + return; + } } delete xid_rect; } -static const struct wl_callback_listener surface_frame_listener = { - .done = surface_frame_done, -}; - - void Fl_Wayland_Window_Driver::resize(int X, int Y, int W, int H) { static int depth = 0; struct wld_window *fl_win = fl_wl_xid(pWindow);