Use a proper default size for ImGui and LVGL

Signed-off-by: falkTX <[email protected]>

opengl/DearImGui.cpp

@@ -1,7 +1,7 @@
 /*
  * Dear ImGui for DPF
  * Copyright (C) 2021 Jean Pierre Cimalando <[email protected]>
- * Copyright (C) 2021-2022 Filipe Coelho <[email protected]>
+ * Copyright (C) 2021-2024 Filipe Coelho <[email protected]>
  *
  * Permission to use, copy, modify, and/or distribute this software for any purpose with
  * or without fee is hereby granted, provided that the above copyright notice and this
@@ -98,8 +98,8 @@ struct ImGuiWidget<BaseWidget>::PrivateData {
 
         ImGuiIO& io(ImGui::GetIO());
         io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
-        io.DisplaySize.x = self->getWidth();
-        io.DisplaySize.y = self->getHeight();
+        io.DisplaySize.x = self->getWidth() ?: 640 * scaleFactor;
+        io.DisplaySize.y = self->getHeight() ?: 480 * scaleFactor;
         // not needed, we handle this ourselves
         // io.DisplayFramebufferScale = ImVec2(scaleFactor, scaleFactor);
         io.IniFilename = nullptr;

opengl/LVGL.cpp

@@ -72,15 +72,16 @@ struct LVGLWidget<BaseWidget>::PrivateData {
         lv_delay_set_cb(msleep);
         lv_tick_set_cb(gettime_ms);
 
-        const uint width = self->getWidth() ?: 100;
-        const uint height = self->getHeight() ?: 100;
+        const double scaleFactor = self->getTopLevelWidget()->getScaleFactor();
+        const uint width = self->getWidth() ?: 640 * scaleFactor;
+        const uint height = self->getHeight() ?: 480 * scaleFactor;
 
         lv_area_set(&updatedArea, 0, 0, width, height);
 
         display = lv_display_create(width, height);
         DISTRHO_SAFE_ASSERT_RETURN(display != nullptr,);
 
-        lv_display_set_dpi(display, LV_DPI_DEF * self->getTopLevelWidget()->getScaleFactor());
+        lv_display_set_dpi(display, LV_DPI_DEF * scaleFactor);
 
         group = lv_group_create();
         lv_group_set_default(group);