From c6da67a7a37090c931feae0800cee1cf8175bb3b Mon Sep 17 00:00:00 2001
From: Alex <enderice2@users.noreply.github.com>
Date: Sun, 26 Mar 2023 21:16:02 +0300
Subject: [PATCH] Add SetDoNotScroll

---
 Core/Video/Display.cpp | 21 +++++++++++++++++++--
 Kernel.cpp             |  1 +
 include/display.hpp    |  2 ++
 3 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/Core/Video/Display.cpp b/Core/Video/Display.cpp
index 48be5f5..9d78ce8 100644
--- a/Core/Video/Display.cpp
+++ b/Core/Video/Display.cpp
@@ -188,6 +188,9 @@ namespace Video
             return;
         }
 
+        if (this->Buffers[Index].DoNotScroll)
+            return;
+
         if (Lines == 0)
             return;
 
@@ -201,6 +204,17 @@ namespace Video
         }
     }
 
+    void Display::SetDoNotScroll(bool Value, int Index)
+    {
+        if (unlikely(this->Buffers[Index].Checksum != 0xDEAD))
+        {
+            debug("Invalid buffer %d", Index);
+            return;
+        }
+
+        this->Buffers[Index].DoNotScroll = Value;
+    }
+
     char Display::Print(char Char, int Index, bool WriteToUART)
     {
         if (unlikely(this->Buffers[Index].Checksum != 0xDEAD))
@@ -302,8 +316,11 @@ namespace Video
 
         if (this->Buffers[Index].CursorY + FontHeight >= this->Buffers[Index].Height)
         {
-            this->Buffers[Index].CursorY -= FontHeight;
-            this->Scroll(Index, 1);
+            if (!this->Buffers[Index].DoNotScroll)
+            {
+                this->Buffers[Index].CursorY -= FontHeight;
+                this->Scroll(Index, 1);
+            }
         }
 
         switch (this->CurrentFont->GetInfo().Type)
diff --git a/Kernel.cpp b/Kernel.cpp
index e1b8dc6..c136926 100644
--- a/Kernel.cpp
+++ b/Kernel.cpp
@@ -224,6 +224,7 @@ EXTERNC NIF void Main(BootInfo *Info)
     {
         Display->CreateBuffer(0, 0, 1);
 
+        Display->SetDoNotScroll(true, 1);
         Video::ScreenBuffer *buf = Display->GetBuffer(1);
         Video::FontInfo fi = Display->GetCurrentFont()->GetInfo();
         Display->SetBufferCursor(1, 0, buf->Height - fi.Height);
diff --git a/include/display.hpp b/include/display.hpp
index aae8ee6..bc213a6 100644
--- a/include/display.hpp
+++ b/include/display.hpp
@@ -84,6 +84,7 @@ namespace Video
         uint32_t Color;
         uint32_t CursorX, CursorY;
         char Brightness;
+        bool DoNotScroll;
         long Checksum;
     };
 
@@ -135,6 +136,7 @@ namespace Video
         void SetPixel(uint32_t X, uint32_t Y, uint32_t Color, int Index);
         uint32_t GetPixel(uint32_t X, uint32_t Y, int Index);
         void Scroll(int Index, int Lines);
+        void SetDoNotScroll(bool Value, int Index);
 
         char Print(char Char, int Index, bool WriteToUART = false);
         void DrawString(const char *String, uint32_t X, uint32_t Y, int Index, bool WriteToUART = false);