mirror of
https://github.com/kuhyx/testsAndMisc-archive.git
synced 2026-07-04 15:03:04 +02:00
Krzysztof kuhy Rudnicki
ee41f014b2
- Move slow hooks (mypy, pylint, bandit, pytest, prettier) to pre-push stage - Remove redundant autoflake (ruff covers F401/F841) - Fix shellcheck OOM by batching files with xargs -n 40 - Remove tracked .o, .wav, .pyc binaries from git - Move pomodoro wav files to ../testsAndMisc_binaries/ with symlinks - Add *.o, *.so, *.a to .gitignore - Refactor hltb._pick_best_hltb_entry to fix C901/PLR0911/SIM102 - Fix SC2034 warnings in gif_to_square.sh and upgrade.sh - Add disk_cleanup_check.sh script - Various test and code improvements across screen_locker, steam_backlog_enforcer, word_frequency, moviepy_showcase
188 lines
4.4 KiB
Markdown
188 lines
4.4 KiB
Markdown
# JPG Image Viewer
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A simple, lightweight image viewer written in C using SDL2. Supports JPG, PNG, BMP, GIF, and TIF formats with zooming, panning, and basic image navigation features.
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## Features
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- **Multi-format support**: JPG, JPEG, PNG, BMP, GIF, TIF
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- **Zoom functionality**: Mouse wheel or keyboard controls
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- **Pan support**: Click and drag to move around zoomed images
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- **Auto-fit**: Automatically fits large images to window
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- **Responsive**: Resizable window with real-time updates
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- **Keyboard shortcuts**: Quick controls for common operations
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## Dependencies
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The image viewer requires SDL2 and SDL2_image libraries.
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### Ubuntu/Debian
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```bash
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sudo apt-get update
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sudo apt-get install libsdl2-dev libsdl2-image-dev
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```
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### Fedora/RHEL/CentOS
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```bash
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sudo dnf install SDL2-devel SDL2_image-devel
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```
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### Arch Linux
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```bash
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sudo pacman -S sdl2 sdl2_image
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```
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### macOS (with Homebrew)
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```bash
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brew install sdl2 sdl2_image
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```
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## Installation
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### Arch Linux (Automated)
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For Arch Linux users, there's an automated installation script that handles everything:
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```bash
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./install_arch.sh
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```
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This script will:
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- Install SDL2 dependencies via pacman
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- Build the imageviewer from source
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- Install the binary to `/usr/local/bin`
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- Create a desktop entry for GUI access
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- Set up file associations
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To uninstall:
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```bash
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./uninstall_arch.sh
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```
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### Manual Building
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1. Install dependencies (see above)
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2. Build the project:
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```bash
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make
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```
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Or use the dependency helper:
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```bash
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make deps-debian # For Ubuntu/Debian
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make deps-fedora # For Fedora/RHEL/CentOS
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make deps-arch # For Arch Linux
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make
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```
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## Usage
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```bash
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./imageviewer <image_file>
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```
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Example:
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```bash
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./imageviewer photo.jpg
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./imageviewer ../misc/randomJPG/14k/bloated_image_1.jpg
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```
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## Controls
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| Control | Action |
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| --------------- | ---------------------------------- |
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| **Mouse wheel** | Zoom in/out |
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| **+ / -** | Zoom in/out (keyboard) |
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| **Mouse drag** | Pan around the image |
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| **R** | Reset zoom and position to default |
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| **F** | Fit image to window |
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| **H** | Show help in console |
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| **ESC / Q** | Quit the application |
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## Features in Detail
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### Zooming
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- Use mouse wheel to zoom in/out at the mouse cursor position
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- Keyboard shortcuts: `+` to zoom in, `-` to zoom out
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- Zoom range: 0.1x to 10x
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- Smart zoom behavior focuses on mouse position
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### Panning
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- Click and drag with left mouse button to move around zoomed images
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- Smooth panning for precise positioning
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- Works at any zoom level
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### Auto-fit
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- Large images are automatically scaled to fit the window when first loaded
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- Press `F` to manually fit the current image to window
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- Maintains aspect ratio
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### Window Management
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- Resizable window that adapts to content
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- Real-time rendering updates
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- Dark background for better image contrast
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## Technical Details
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- **Language**: C (C99 standard)
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- **Graphics**: SDL2 for window management and rendering
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- **Image loading**: SDL2_image for multi-format support
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- **Performance**: Hardware-accelerated rendering when available
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- **Memory**: Efficient texture management with proper cleanup
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## Makefile Targets
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- `make` or `make all` - Build the image viewer
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- `make clean` - Remove built files
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- `make test` - Run with a test image (if available in randomJPG folder)
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- `make deps-debian` - Install dependencies on Ubuntu/Debian
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- `make deps-fedora` - Install dependencies on Fedora/RHEL/CentOS
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- `make deps-arch` - Install dependencies on Arch Linux
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- `make help` - Show available targets and usage
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## Troubleshooting
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### "SDL could not initialize" Error
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Make sure SDL2 development libraries are installed:
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```bash
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# Ubuntu/Debian
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sudo apt-get install libsdl2-dev libsdl2-image-dev
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# Check if libraries are found
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pkg-config --libs sdl2
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```
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### "Unable to load image" Error
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- Check that the image file exists and is readable
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- Verify the image format is supported (JPG, PNG, BMP, GIF, TIF)
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- Try with a different image file to isolate the issue
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### Compilation Errors
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- Ensure you have a C compiler installed (gcc or clang)
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- Check that SDL2 headers are available
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- Try rebuilding with `make clean && make`
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## License
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This project is open source. See the LICENSE file for details.
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## Contributing
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Feel free to submit issues and enhancement requests. The code is designed to be simple and educational while being fully functional.
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