DiscordOverlay

Overview

DiscordOverlay.Helpers is a proof of concept C# library designed to demonstrate how to use Discord's overlay for drawing custom graphics. It utilizes SkiaSharp for graphics rendering and system-level functions for memory manipulation.

Features

Direct Memory Management: Leverages kernel32.dll for memory operations within Discord's process.
Graphics Rendering: Utilizes SkiaSharp for high-quality 2D graphics.
Overlay Management: Controls the overlay in Discord, with capabilities for various graphical operations.

How It Works

Hooking into Discord

The library interacts with Discord's process memory using Memory class methods like OpenFileMapping and MapViewOfFile.
These methods access and map Discord's memory, enabling the overlay to be drawn within its graphical interface.

Graphics Rendering with SkiaSharp

SkiaSharp is used for drawing graphics onto the overlay.
The Drawing class offers methods such as DrawLine, DrawRectangle, DrawString, and DrawCircle.

Managing Graphics Frames and Writing to the Buffer

Frame Management: GraphicsPipe manages the connection to Discord, handling the shared memory for frame data.
Frame Representation: The Frame class represents each graphics frame, storing dimensions and pixel data.
Buffer Writing Process:
- The graphics drawn using SkiaSharp are rendered onto a frame buffer (Frame.Buffer).
- This buffer is a byte array representing pixel data for the entire frame.
- The GraphicsPipe.SendFrame method is used to send this frame to the shared memory.
- It involves copying the frame buffer to the shared memory location mapped to Discord's process.
- The header (GraphicsPipe.Header) is updated with the new frame's dimensions and frame count.
- This process ensures that each new frame is accurately rendered in the overlay.

Galenika/DiscordOverlay