CBoomer

A C port of Boomer by Tsoding - a zoomer application for Linux. This port focuses on the core functionality (screenshot viewing, zoom, pan, flashlight) and does not yet implement live window tracking (honestly, I've never used it)

Features

• Fullscreen screenshot viewer with smooth zoom and pan
• Flashlight effect that follows your cursor
• Clean, modular C code with single-header libraries

Differences from original Boomer

• No live window tracking - focused on screenshot viewing only
• Additional configuration - more camera and flashlight parameters exposed in config.h
• Screenshot rotation (both directions)
• Screenshot mirroring (horizontal flip)
• Screenshot export to a configurable path
• Soft flashlight edges - smooth gradient instead of hard circular cutoff (you can enable it in the config.h)
• Configurable texture filtering - switch between pixelated and smooth (check config.h)

Pre-built Binaries

Check the Releases page for portable Linux executables. Requires:

• Linux x86_64 system
• X11
• GPU with OpenGL support (any modern GPU works)

Build from source

Dependencies

• X11 development libraries (libX11, libXext, libXrandr)
• OpenGL development libraries (libGL, libGLX)
• GLEW (OpenGL Extension Wrangler)
• zlib (for PNG export)

Build and run

make
./cboomer

For faster screenshot capture with MIT-SHM:

make USE_XSHM=1
./cboomer

Default Controls

Control	Action
Esc	Quit
1	Reset camera
2	Toggle flashlight
3	Rotate screenshot left
4	Rotate screenshot right
5	Mirror screenshot horizontally
= / -	Zoom in / out
s	Save current view to ~/cboomer_screenshot.png
Drag with left mouse	Pan the image
Scroll wheel	Zoom in / out
Ctrl + = / -	Change flashlight radius
Ctrl + Scroll wheel	Change flashlight radius

You can modify the controls in src/config.h and recompile

Project Structure

• src/cboomer.c - Main application logic
• src/config.h - Configuration
• src/la.h - Linear algebra
• src/screenshot.h - Screenshot capture