- Updated the canvas composite shader to include a selection mask fill and animated marching ants border.
- Added new uniforms for animation time, selection mask presence, and quick mask mode.
- Modified the fragment shader to handle selection rendering, including color tinting for selected areas and a dash pattern for the marching ants effect.
- Refactored the OverlayProgram to remove the old marching ants rendering logic, now handled by the GPU shader.
- Introduced new data structures in the shader pipeline for managing selection mask textures and samplers.
- Implemented functionality to upload selection mask data to the GPU.
- Updated selection state handling to ensure correct bounds calculations.
- Enhanced sidebar tool button rendering with fallback for missing icons.
phantom
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