Velocitty 1.3.0

Hotfix asset update, 2026-11-04: Downloads and checksums were rebuilt from 1.3.0-hotfix (commit 1fb7e46). This includes the macOS mirrored input-ring, alternate-screen scrolling, and CSI parameter fixes. The v1.3.0 source tag remains at its original commit.

Velocitty 1.3.0

Velocitty 1.3 redesigns input handling around a mirrored 1 MiB ring buffer and a pre-parser. Under input pressure, it skips cell painting only when later input proves it obsolete, while preserving ordered terminal-state processing. Large control strings use separate stream storage rather than being limited to the input ring.

Performance and output handling

• Bounded, reusable parser metadata and shared CSI parsing.
• Direct stream-buffer reads and image-buffer handoff to reduce copying for large transfers.
• SIMD UTF-8 decoding and bulk text-printing paths.
• Reduced terminal cells to 8 bytes using shared, interned styles.
• Style-table compaction and renderer invalidation when style IDs change.

The style-table idea came from Ghostty.

Unicode and text

• Unicode 18 grapheme-break tables.
• Extended grapheme-cluster handling with mode 2027 support.
• Improved combining marks, variation selectors, emoji sequences, and cluster-width changes at line boundaries.
• Added combining-mark rendering and Hangul-jamo composition.
• Updated selection and copying to preserve complete grapheme clusters.
• Preserved clusters through insertion, deletion, erasure, and reflow.
• Preserved styled trailing spaces and active/saved cursor positions through wide-glyph reflow.

Graphics

• Anchored kitty and sixel images to scrollback lines.
• Updated image placement handling for scrolling regions and history expiration.
• Deferred eligible image decoding until a placement becomes visible.
• Improved image-transfer ownership, cleanup, and retransmission handling.
• Added support for image strings larger than the input ring.
• Preserved anchors, blank-cell placements and the scrolled viewport through resize/reflow.
• Corrected natural/scaled cursor advancement, pending wrap and sixel double-scrolling.
• Retained named image data for re-placement after clears and lowercase deletion.
• Added bounded, decode-independent cache accounting and unplaced-first eviction.
• Refined visible/point/placement-ID deletion and cancellation of unfinished uploads.
• Kept anonymous/sixel image IDs distinct from existing named Kitty images, including ID wraparound.
• Bounded sixel RGB scaling and header counters, and corrected allocation-failure cleanup.

Font loading

• Resolve the configured primary or system monospace font without hardcoded preferred paths.
• Load styled and fallback faces on demand, preserve fallback order, deduplicate data and cache failed lookups.
• Keep valid blank glyphs from triggering unnecessary fallback loads during ASCII warmup.
• Make rendering benchmarks follow application font selection and parser-only benchmarks font-free.
• Preserve selected font-collection members in primary loading, lazy fallback identity and rasterization.

Correctness and input

• Hardened paste handling against escape/control injection; allocation failures no longer fall back to raw input.
• Fixed composed Unicode input under Kitty's all-keys reporting mode.
• Fixed no-button mouse-motion reporting and urxvt mouse-button encoding.
• Propagated resize allocation errors instead of silently publishing inconsistent dimensions.
• Reaped Linux notification child processes and protected notification arguments with --.
• Corrected raw C1-byte handling, reset behavior, and soft-wrap clearing during erasure.
• Preserved existing cells during tabulation and the live cursor content during height-only window shrinking.
• Retained rectangle-copy source cells during pressure parsing and honored updated extended palette entries.
• Corrected reverse-video repainting and selection highlights after framebuffer scroll reuse.

Benchmarks and tests

• Added Ghostty-compatible headless +terminal-stream benchmarking.
• Added automated Ghostty throughput comparisons with raw samples and generated charts.
• Changed the chart to grouped horizontal bars with independent, zero-based linear scales.
• Added startup comparisons for Velocitty, foot, and Monstar.
• Expanded parsing, graphics, drain, firehose, and rendering benchmark workloads.
• Added configurable benchmark optimization and a bench-install target.
• Added differential firehose tests, split-input sweeps, seeded fuzzing, and Unicode/rendering regressions.
• Removed the obsolete standalone rendering/golden-test harness and older benchmark implementations.

Packaging and documentation

• Consolidated icons, desktop metadata, and Windows resources under assets/.
• Updated icon generation to use the canonical SVG.
• Updated build, packaging, and installer asset paths.
• Added Linux package Makefile installation/uninstallation with PREFIX and DESTDIR support.
• Added design pages, benchmark imagery, storage diagrams and subsystem references.
• Updated README branding, feature descriptions, Linux installation instructions, and the man page.

Downloads

Windows and macOS downloads are unsigned. Windows may show SmartScreen; macOS users can allow the app in System Settings → Privacy & Security after the first launch attempt.

Use SHA256SUMS to verify the downloaded packages.