fix(deps): update module github.com/mattn/go-sixel to v0.0.9

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/mattn/go-sixel	v0.0.8 → v0.0.9

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Release Notes

mattn/go-sixel (github.com/mattn/go-sixel)

v0.0.9

Compare Source

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Renovate PR Review Results

⚖️ Safety Assessment: ✅ Safe

🔍 Release Content Analysis

Version Change: github.com/mattn/go-sixel v0.0.8 → v0.0.9

Key Changes in v0.0.9:

• Performance Optimizations: Multiple commits optimize the sixel encoder hot path, including a new RGBA fast path that bypasses dithering for direct RGBA encoding
• Terminal Compatibility: Replaced raw ioctl syscalls with the go-tty library for terminal size detection, improving cross-platform compatibility
• Bug Fixes:
  • Fixed decoder image growth issue with repeated sixel runs
  • Fixed frame delay accounting in GIF handling (gosgif)
  • Added validation for resize dimensions (gosr)
• New Features (in CLI tools, not core library):
  • Added gosvideo player for video playback
  • New -colors and -dither command-line flags
  • Switched ffmpeg output format from rgb24 to rgba
• Dependency Updates: Updated go-tty to v0.0.8

Breaking Changes: None identified. The public API remains fully compatible.

Security Fixes: No security-related fixes mentioned in release notes.

🎯 Impact Scope Investigation

Usage Locations in Codebase:

• internal/gat/gat.go:239 - sixel.NewEncoder(w).Encode(img) for image display without resize
• internal/gat/gat.go:253 - sixel.NewEncoder(w).Encode(dst) for resized image display

API Compatibility Analysis:

• The Encoder type structure is identical between v0.0.8 and v0.0.9
• NewEncoder(w io.Writer) *Encoder signature unchanged
• Encode(img image.Image) error method signature unchanged
• All public fields (Dither, Width, Height, Colors) remain the same

Dependency Impact:

• No transitive dependency changes that affect gat
• The update adds github.com/mattn/go-tty v0.0.8 as a dependency of go-sixel, but this is internal to go-sixel

Test Results:

• ✅ All existing tests pass: go test ./... completed successfully
• ✅ Build succeeds without errors: go build completed successfully
• ✅ No compilation warnings or errors

💡 Recommended Actions

Immediate Actions:

1. ✅ Safe to merge - This is a minor version update with no breaking changes
2. The performance optimizations in the encoder may provide faster image rendering in terminals
3. Improved terminal compatibility through go-tty integration reduces platform-specific issues

No Migration Required:

• No code changes needed in gat
• No configuration changes required
• All existing functionality preserved with backward compatibility

Testing Recommendation:

• Standard CI/CD pipeline testing is sufficient
• Optional: Manual testing of image display functionality to verify performance improvements

🔗 Reference Links

• Release Comparison v0.0.8...v0.0.9
• go-sixel v0.0.9 Release
• API Documentation v0.0.9
• API Documentation v0.0.8

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