From 51dd8ba6aa51c0ca4d82889d8e0078a965047dfb Mon Sep 17 00:00:00 2001
From: Alex <enderice2@users.noreply.github.com>
Date: Thu, 16 Mar 2023 18:51:35 +0200
Subject: [PATCH] Implement Display::SetBrightness

---
 Core/Video/Display.cpp | 40 ++++++++++++++++++++++++++++++++++++++++
 include/display.hpp    |  2 ++
 2 files changed, 42 insertions(+)

diff --git a/Core/Video/Display.cpp b/Core/Video/Display.cpp
index e95d008..595c8b1 100644
--- a/Core/Video/Display.cpp
+++ b/Core/Video/Display.cpp
@@ -48,6 +48,7 @@ namespace Video
         buffer->Color = 0xFFFFFF;
         buffer->CursorX = 0;
         buffer->CursorY = 0;
+        buffer->Brightness = 100;
         this->Buffers[Index] = buffer;
         memset(this->Buffers[Index]->Buffer, 0, Size);
         this->Buffers[Index]->Checksum = 0xDEAD;
@@ -56,6 +57,12 @@ namespace Video
 
     void Display::SetBuffer(int Index)
     {
+        if (this->Buffers[Index]->Brightness != 100)
+            this->SetBrightness(this->Buffers[Index]->Brightness, Index);
+
+        if (this->Buffers[Index]->Brightness == 0) /* Just clear the buffer */
+            memset(this->Buffers[Index]->Buffer, 0, this->Buffers[Index]->Size);
+
         memcpy(this->framebuffer.BaseAddress, this->Buffers[Index]->Buffer, this->Buffers[Index]->Size);
     }
 
@@ -79,6 +86,39 @@ namespace Video
         delete this->Buffers[Index], this->Buffers[Index] = nullptr;
     }
 
+    void Display::SetBrightness(int Value, int Index)
+    {
+        if (this->Buffers[Index] == nullptr)
+            return;
+
+        if (Value > 100)
+            Value = 100;
+        else if (Value < 0)
+            Value = 0;
+
+        ScreenBuffer *buffer = this->Buffers[Index];
+        uint32_t *pixel = (uint32_t *)buffer->Buffer;
+
+        for (uint32_t y = 0; y < buffer->Height; y++)
+        {
+            for (uint32_t x = 0; x < buffer->Width; x++)
+            {
+                uint32_t color = pixel[y * buffer->Width + x];
+
+                uint8_t r = color & 0xff;
+                uint8_t g = (color >> 8) & 0xff;
+                uint8_t b = (color >> 16) & 0xff;
+
+                r = (r * Value) / 100;
+                g = (g * Value) / 100;
+                b = (b * Value) / 100;
+
+                pixel[y * buffer->Width + x] = (b << 16) | (g << 8) | r;
+            }
+        }
+        buffer->Brightness = Value;
+    }
+
     void Display::SetBufferCursor(int Index, uint32_t X, uint32_t Y)
     {
         this->Buffers[Index]->CursorX = X;
diff --git a/include/display.hpp b/include/display.hpp
index cd981ba..64998e8 100644
--- a/include/display.hpp
+++ b/include/display.hpp
@@ -83,6 +83,7 @@ namespace Video
         size_t Size;
         uint32_t Color;
         uint32_t CursorX, CursorY;
+        char Brightness;
         long Checksum;
     };
 
@@ -103,6 +104,7 @@ namespace Video
         ScreenBuffer *GetBuffer(int Index);
         void ClearBuffer(int Index);
         void DeleteBuffer(int Index);
+        void SetBrightness(int Value, int Index);
         void SetBufferCursor(int Index, uint32_t X, uint32_t Y);
         void GetBufferCursor(int Index, uint32_t *X, uint32_t *Y);
         void SetPixel(uint32_t X, uint32_t Y, uint32_t Color, int Index);