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Terminal features: MSLP command links and pictures in a figure's cells - #45
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AnsiOutputOptions describes one client: colour depth, TerminalFeatures (Hyperlinks, CommandLinks, KittyGraphics, InlineImages, Sixel, BlockArt) and an ITerminalPictureSource for pixels. A Figure laid out under LayoutContext.Pictures marks each row of its cells with PictureCellsMarkup; the ANSI emitter draws the picture there or leaves the art. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01448U5MvpKkRkBjwzkkpPFP
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WalkthroughANSI output now supports configurable links and picture protocols. Figure layout can reserve cells for images, and ANSI emission can render supplied pixels as Kitty graphics, inline images, Sixel, or block art. ChangesANSI terminal features and pictures
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant FigureDraw
participant LayoutContext
participant AnsiSetEmitter
participant ITerminalPictureSource
participant TerminalPictureWriter
FigureDraw->>LayoutContext: Request fitted picture cells
LayoutContext-->>FigureDraw: Return cell dimensions
FigureDraw-->>AnsiSetEmitter: Emit picture-cell rows
AnsiSetEmitter->>ITerminalPictureSource: Look up picture pixels
ITerminalPictureSource-->>AnsiSetEmitter: Return picture data
AnsiSetEmitter->>TerminalPictureWriter: Render rows using enabled terminal feature
Suggested reviewers: Merge Risk: 🟡 Moderate · up to A host that passes a zero cell size, as terminals report when the size is unknown, can crash ANSI output for that connection when Sixel is used. Colourless clients with BlockArt see meaningless blocks in place of the figure's art. Validate the cell sizes before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 62.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 72 functions across 16 files. (4 skipped: 4 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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Encodings (Kitty transmission, iTerm2 PNG, sixel, half-block rows) are kept with the TerminalPicture, so every connection shown a picture at a size gets a copy. Kitty now sends a PNG (f=100); PNGs are RGB when opaque, filtered Up, at zlib level 2. Sixel reads each band once and writes a colour only over the columns it reaches, with P2=0 for an opaque picture. Half blocks scale the picture once rather than once per row. Large payloads go straight to the output instead of through the run's buffers. On a 512x384 picture in 60x23 cells: Kitty 25 ms -> 16 ms to encode and 777 -> 423 KiB on the wire, 1.2 ms for each later connection; iTerm2 25 -> 13 ms; sixel 20 -> 7 ms; half blocks 14 -> 3 ms. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01448U5MvpKkRkBjwzkkpPFP
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Actionable comments posted: 2
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @MarkupString.Ansi/AnsiOutputOptions.cs:
- Around line 16-20: Update the CellWidth and CellHeight init accessors in
AnsiOutputOptions to reject zero and negative values when options are built,
while preserving their existing defaults of 10 and 20. Reuse the validation
approach in PictureCells.Fit where appropriate.
Review comments at @MarkupString.Ansi/Emitters/AnsiSetEmitter.cs:
- Line 32: Update the `_pictureMethod` initializer to treat
`TerminalFeatures.BlockArt` as unavailable when `options.ColorDepth` is
`AnsiColorDepth.Attributes` or `AnsiColorDepth.None`; pass the remaining
features to `TerminalPictureWriter.Method` and preserve the existing behavior
for other color depths and when `options.Pictures` is null.
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📒 Files selected for processing (20)
CHANGELOG.mdMarkupString.Ansi/AnsiColorDepth.csMarkupString.Ansi/AnsiOutputOptions.csMarkupString.Ansi/AnsiRegistration.csMarkupString.Ansi/Emitters/AnsiEmitterSupport.csMarkupString.Ansi/Emitters/AnsiSetEmitter.csMarkupString.Ansi/Emitters/PictureEncodings.csMarkupString.Ansi/Emitters/PictureScaler.csMarkupString.Ansi/Emitters/PngWriter.csMarkupString.Ansi/Emitters/SixelWriter.csMarkupString.Ansi/Emitters/TerminalPictureWriter.csMarkupString.Ansi/PublicAPI.Unshipped.txtMarkupString.Ansi/README.mdMarkupString.Ansi/TerminalFeatures.csMarkupString.Ansi/TerminalPicture.csMarkupString.Tests/Ansi/TerminalFeatureTests.csMarkupString/Elements/PictureCellsMarkup.csMarkupString/Layout/Blocks/Block.csMarkupString/Layout/Blocks/Figure.csMarkupString/PublicAPI.Unshipped.txt
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…t art A terminal that does not know its cell size reports 0, and a sixel at width 0 divided by zero. Half blocks at Attributes or None depth lost every colour and were a grid of identical blocks. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01448U5MvpKkRkBjwzkkpPFP
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Requested by Grave · project thread
Before: the only switch for a terminal was
hyperlinks(OSC 8 on or off). A command link was always plain text, and aFigurewas always its text art.After:
AnsiOutputOptionsdescribes one client: colour depth,TerminalFeatures, and anITerminalPictureSourcethat supplies pixels. With it:CommandLinkswrites command links as MSLP (ESC]68;1;SEND;cmd BEL+ underlined text).Figurelaid out underLayoutContext.Picturesreserves its picture's cells and marks each row withPictureCellsMarkupover the art. The ANSI emitter draws the picture there:KittyGraphics: Unicode placeholders (U+10EEEE with row/column diacritics, id as a truecolor foreground). The picture is sent once per connection witha=T,U=1,q=2, as zlib RGBA in 4096-byte chunks.InlineImages(iTerm2) andSixel: the cursor makes room below withESC D, the picture is drawn betweenESC 7/ESC 8, and each row steps over its cells withCSI n C, so no text is written over the picture.BlockArt:▀/▄half blocks at the client's colour depth.The rows are the same width whichever way they're drawn, so a box or flex row round the figure stays aligned (there is a test for this).
How: the picture writers live in
TerminalPictureWriter, with a small PNG encoder (for iTerm2), a 216-colour sixel encoder and an area-averaging scaler. The package still does no I/O: fetching and decoding a file is the host's job. All additions are additive. The(depth, hyperlinks)overloads stay, mapped onto the new options, so package validation against 2.11.1 passes.Tests:
TerminalFeatureTests(18) covering links, layout marking, Kitty chunking/ids/placeholders/once-only sending, iTerm2 PNG validity, sixel size and bands, half blocks, and alignment. The full suite passes locally (1049).SharpMUSH wires this up per connection in a follow-up PR; TelnetNegotiationCore#142 adds the terminal probe it uses.
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