FqView is an application I use to learn Rust programming. The main purpose is to quickly view images by pre-loading them into video memory and have the GPU preform any scaling. It can browse into archives to load images. It uses Speedy2D to upload images as OpenGL textures.
FqView uses image crate, zip crate, libarchive and libheif to support these image and archive types:
Images: bmp, dds, ff, gif, hdr, ico, jpg, jpeg, exr, png, pnm, qoi, tga, tif, tiff, webp, heic and heif
Archives: iso, zip, 7z, cab, rar, xar, lzh, lha, gz, bz2 and zst
For zip-type archives it can browse into archives, in archives, in archives, etc. without using temporary files - but limited by available memory.
Currently these controls are configured:
- Next/prev image - Mouse wheel, PageDown/PageUp
- Zoom in/out - Pause/ScrollLock
- Zoom 1:1 - / or Insert
- Zoom fit to window - * or Delete
Move part image displayed using arrow keys or mouse dragging.
Holding Ctrl/Shift and an arrow key makes the scrolling faster/slower.
Right click in browser view goes up a directory level.
As a learning project there is plenty to improve upon. In no particular order:
- Support opening files from commandline
- Make it possible to unload images and data
- Change caching to preload more images
- Make memory usage data concur with external tools
- Save view settings for images on program exit
- Clean up unwrap()'s
- Improve code clarity
- Add scrollbars to imageview
- Make browser columns resizable
- Remember last selected file in directory
- Support sorting in fileview
- Display filesizes inside supported archives
- Auto-scroll statusbar messages
- Add [index/ ..] of browsable images to window label
- Document functions
- Use Rust lifetime specifiers
- HiDPI support / resize viewport on fltk global zoom
- Support other OS's than Linux
- Force image load with Ctrl
- Force archive load with Alt