qimgv-plus v2.1.0

New Features & Improvements

• FidelityFX-CAS Integration – Added a new high-quality scaling and sharpening filter based on AMD's FidelityFX Contrast Adaptive Sharpening (CAS). The filter is processed entirely on the GPU via OpenGL shaders, providing excellent image clarity with zero CPU overhead.
• Interactive CAS Settings Panel – Added a new floating CAS settings overlay for real-time adjustment of sharpening and contrast parameters. Accessible via the context menu, and sliders can be quickly reset to defaults by double-clicking them.
• JPEG 2000 & HTJ2K/JPH Support – Added comprehensive support for JPEG 2000 formats (.jp2, .j2k, .jpf, .jpx, .jpc) and the modern high-throughput HTJ2K format (.jph). This includes Shell Extension and installer integration for automatic thumbnail generation directly inside Windows Explorer.
• Improved Downscaling Quality – Implemented automatic mipmap generation and trilinear filtering for OpenGL-accelerated rendering (active when using CAS or color adjustments). This completely eliminates aliasing ("staircasing" artifacts) and visual noise when zooming out.
• Toggle Filter at 100% Scale – Added a new option "Also use filter for 100% scale" under settings, allowing users to apply scaling filters (including CAS) even when viewing images at their native 1:1 resolution.

Bug Fixes

• Preserve Original Image on Save-As – Fixed an issue in the "Save As" flow where saving a copy of an edited image under a different filename or path would incorrectly replace the active document in the viewer instead of leaving the original file open.