phantom
2d5b7a37e8
- Introduced `SharedCompositePixels` for stable full-canvas pixel storage, enabling efficient pipeline creation and recovery. - Added `TextureUpdate` struct for tightly packed dirty rectangle uploads, reducing unnecessary data copying. - Refactored `upload_dirty_region` to utilize `TextureUpdate`, improving performance by eliminating full buffer scans. - Implemented `encode_selection_texture` to generate an encoded R8 selection mask, optimizing selection rendering. - Updated shader to sample selection texture only once, reducing GPU workload. - Added comprehensive tests for texture updates, selection encoding, and performance diagnostics. - Documented design decisions and validation sequences to ensure future performance stability.