Force full screen refresh with a rounder function

When the screen switches, the full screen needs to be refreshed for the
hardware scrolling to work. This was enforced with backgroundLabels, but
is simpler to do with a rounder function.

1 files changed, 13 insertions, 3 deletions

diff --git a/src/displayapp/LittleVgl.cpp b/src/displayapp/LittleVgl.cpp
index e7b58c1..25f3591 100644
--- a/src/displayapp/LittleVgl.cpp
+++ b/src/displayapp/LittleVgl.cpp
@@ -16,14 +16,22 @@ static void disp_flush(lv_disp_drv_t* disp_drv, const lv_area_t* area, lv_color_
   lvgl->FlushDisplay(area, color_p);
 }
 
+static void rounder(lv_disp_drv_t* disp_drv, lv_area_t* area) {
+  auto* lvgl = static_cast<LittleVgl*>(disp_drv->user_data);
+  if (lvgl->GetFullRefresh()) {
+    area->x1 = 0;
+    area->x2 = LV_HOR_RES - 1;
+    area->y1 = 0;
+    area->y2 = LV_VER_RES - 1;
+  }
+}
+
 bool touchpad_read(lv_indev_drv_t* indev_drv, lv_indev_data_t* data) {
   auto* lvgl = static_cast<LittleVgl*>(indev_drv->user_data);
   return lvgl->GetTouchPadInfo(data);
 }
 
-LittleVgl::LittleVgl(Pinetime::Drivers::St7789& lcd, Pinetime::Drivers::Cst816S& touchPanel)
-  : lcd {lcd}, touchPanel {touchPanel}, previousClick {0, 0} {
-
+LittleVgl::LittleVgl(Pinetime::Drivers::St7789& lcd, Pinetime::Drivers::Cst816S& touchPanel) : lcd {lcd}, touchPanel {touchPanel} {
 }
 
 void LittleVgl::Init() {
@@ -48,6 +56,7 @@ void LittleVgl::InitDisplay() {
   /*Set a display buffer*/
   disp_drv.buffer = &disp_buf_2;
   disp_drv.user_data = this;
+  disp_drv.rounder_cb = rounder;
 
   /*Finally register the driver*/
   lv_disp_drv_register(&disp_drv);
@@ -78,6 +87,7 @@ void LittleVgl::SetFullRefresh(FullRefreshDirections direction) {
       lv_disp_set_direction(lv_disp_get_default(), 4);
     }
   }
+  fullRefresh = true;
 }
 
 void LittleVgl::FlushDisplay(const lv_area_t* area, lv_color_t* color_p) {