Velocitty 1.3.0

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.

Velocitty 1.2.1

Velocitty 1.2.1 fixes compositor-configured keyboard remapping on Wayland.

• Special keys now follow the compositor's xkb keymap instead of physical keycodes, fixing options such as Hyprland's kb_options = caps:swapescape.
• Key repeat eligibility also follows the keymap, including remapped Caps Lock and Escape.
• Adds a real libxkbcommon regression covering swapped key presses/releases, modified Escape, and repeat.

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.

Velocitty 1.2.0

Velocitty 1.2.0 adds native Windows and macOS ports through Peak alongside the existing Linux builds.

• Windows: Win32 window/input/clipboard, ConPTY shells, native fonts, UTF-8 paths, per-monitor DPI, a per-user installer, and a portable ZIP.
• macOS: AppKit window/input/clipboard, POSIX PTYs, Core Text font discovery, Retina rendering, Command+C/V, and a universal Intel/Apple Silicon app in a DMG.
• Linux: Wayland/X11 and Omarchy integration remain supported, with GNU (glibc 2.28+) and dynamically linked musl tarballs for x86_64 and aarch64. The musl builds target systems such as Alpine and require that distribution's musl loader and native GUI libraries.
• Configuration: checked integer parsing, escaped font strings, robust skipping of unrelated TOML settings, and corrected font defaults.
• Branding: the lightning icon is rendered as block ASCII, with an animated README wordmark made using Omarchy's Rust ttfx.

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.

Kitty graphics file/temporary-file transfers and desktop notifications currently use the Linux implementation. Streamed kitty graphics and sixel remain available on all three platforms.

Use SHA256SUMS to verify the downloaded packages.

1.1.0

• Faster across the board: plain text is written a row at a time, scrolling reuses already-drawn rows, and only changed rows are sent to the compositor (Wayland damage_buffer / partial X11 updates).
• CJK, emoji and other fallback-font glyphs are much cheaper to draw; the glyph cache is now a real LRU.
• Images: kitty graphics only repaint the rows they cover, and image scaling is faster.
• Fixed multi-colour sixel images losing colours.
• Builds with Zig 0.17.
• New zig build bench: per-workload PTY → parse → render timings with p50/p95, glyph cache and render benchmarks.

1.0.1

• Typing will bring you back to the prompt if you are looking at scrollback.
• Got rid of the accent key indicator.

1.0.0

Changes

• Fixed accents (~, ^, ´. `, etc.)
• Emojis correctly displayed.
• Bold and italic.
• Performance improvement due to less emoji cache misses.

0.2.0

New Features

C0

• BEL ignored (no visual bell / XBell)
• Last-column flag (LCF) wrap / BS
• HT writing a tab glyph + spaces to the next stop (we only move the cursor)

CSI - SGR / cells

• Styled underlines drawn (double / curly / dotted / dashed); style is stored, render is single
• Underline color (SGR 58/59) on cells; pen only
• Reverse video (DECSCNM 5) applied at draw
• ED 3 erase scrollback
• Grapheme clustering (mode 2027)

CSI - modes / reports

• Mouse reports themselves (modes 1000/1002/1003/1006/1015/1016 are stored only)
• Focus in/out (CSI I / CSI O) when mode 1004 is on
• Theme-change reports (2031)
• Visibility-change reports (2033) after the initial reply
• In-band resize notifications (2048)
• IME (737769)
• Real pixel geometry for window ops 14/15/16 (we fake cols*cell_px)
• XTSMGRAPHICS (CSI ? Pi ; Pa ; Pv S)

OSC

• 9 / 99 / 777 notifications
• 11 background alpha
• 17 / 19 / 117 / 119 selection colors
• 22 mouse cursor
• 52 clipboard
• 66 kitty text-size
• 33 shell-integration marks
• 76 app-id
• 555 flash removed

DCS

• Sixel (DCS q)
• XTGETTCAP (DCS + q)
• Sixel-related private modes 80 / 1070 / 8452 (flags only)

Platforms

• aarch64 support
• MUSL support.

0.1.1

Fixes

• Resize now properly resets scrollback.
• Lines wrap.
• Resizing now fills new areas of the screen.
• SSH to another terminal no longer breaks certain applications due to missing terminfo file.

0.0.1

• Linux
• Kitty Graphics
• Bracketed Paste
• Renders at least neovim, pi and ncmpcpp correctly.
• Omarchy theme and font change live.
• ~400MiB/s on every type of input on an intel i7-10610U