OpenGL Picasa Demo

A modern, hardware-accelerated image viewer built with OpenGL... naaa-h, it's demo, i'm complete it, maybe..

Features

• Hardware-accelerated rendering using modern OpenGL 3.3
• Smooth image scaling and rotation with proper aspect ratio preservation
• Thumbnail gallery view for browsing multiple images
• Interactive UI elements including buttons for navigation, zoom, and rotation
• Drag and drop support for panning images
• Mouse wheel zooming for intuitive image inspection
• Keyboard shortcuts for navigation and manipulation
• Support for common image formats including PNG, JPEG, BMP, and GIF

Building Instructions

Prerequisites

To build the project, you need the following dependencies:

sudo apt-get update
sudo apt-get install -y libglfw3-dev libglew-dev libglm-dev libstb-dev libpng-dev libjpeg-dev cmake build-essential

Compilation

1. Download & Build the application:

git clone https://github.com/0xcds4r/opengl_picasa_cpp.git
cd ~/opengl_picasa_cpp
mkdir -p build
cd build
cmake ..
make

Usage Instructions

Running the Application

./picasa [path_to_image_or_folder]

If you provide a path to an image, the application will open that image directly. If you provide a path to a folder, it will load all images in that folder and display them in the thumbnail view.

Keyboard Controls

• Left/Right Arrow Keys: Navigate between images
• Up/Down Arrow Keys: Rotate image 90 degrees clockwise/counterclockwise
• Mouse Drag: Pan the image
• Mouse Wheel: Zoom in/out
• Tab Key: Toggle between thumbnail view and single image view
• Space Key: Reset view (zoom, rotation, position)
• Escape Key: Exit application

Mouse Controls

• Left-click and drag: Pan the image
• Mouse wheel: Zoom in/out
• Left-click on thumbnail: Select and display that image
• Double-click: Reset zoom and rotation

UI Controls

The application includes buttons at the bottom of the screen for:

• Previous/Next image navigation
• Rotation
• Zoom in/out
• Toggling between thumbnail and single image view

Technical Details

This application is built using:

• OpenGL 3.3 for rendering
• GLFW for window management and input handling
• GLEW for OpenGL extension loading
• GLM for mathematics
• STB libraries for image loading and processing

License

This project is open source and available under the MIT License.