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MCP: screenshot and render_preview draw edges as a PNG export does

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ui.render, which render_preview and screenshot call in the headless
session and in the app, rendered the artboard with the canvas options:
8-bit compositing and edges smoothed shape by shape. A PNG export
composites in floating point and supersamples edges, so the preview
showed edge colors the exported file does not have, most visibly where
shapes meet edge to edge.

ui.render now renders with the options of a PNG export on white, so
its pixels equal the export's at the same scale. render_preview also
no longer enlarges an artboard smaller than max_side: with the default
max_side of 1024, a 612 x 792 page came back as an interpolated
791 x 1024 image, and it now comes back at 612 x 792. docs/mcp.md and
docs/control-protocol.md describe this.
This commit is contained in:
dotCooCoo
2026-10-24 17:29:33 +07:00
committed by bflatastic
parent b049e45b88
commit 58827952b7
7 changed files with 62 additions and 7 deletions
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docs/control-protocol.md
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@@ -103,7 +103,7 @@ the two can still win that race.
| `ui.set` | `{brightness?, panel?, rulers?, outline?, grid?, smartGuides?, boundingBox?, controlBar?}` | |
| `ui.dialog.set` / `.confirm` / `.cancel` | `{field, value}` | fill and submit the open dialog |
| `ui.screenshot` | `{path?, data?}` | capture the window (PNG), written to `path`; `data: true` sends it back as `pngBase64` too. Needs a presented frame: with the screen locked or the window minimized/covered it fails after ~8 s with an explanatory error |
| `ui.render` | `{path?, scale?, artboard?, data?}` | render an artboard headlessly (PNG; `artboard`: its 0-based index, default the first): written to `path`, else (or with `data: true` as well) sent back as `pngBase64` |
| `ui.render` | `{path?, scale?, artboard?, data?}` | render an artboard headlessly (PNG with the pixels of `app.export {format: "png", background: "white"}` at the same scale; `artboard`: its 0-based index, default the first): written to `path`, else (or with `data: true` as well) sent back as `pngBase64` |
| `ui.resize` / `ui.focus` | | |
| `app.open` / `app.save` / `app.export` / `app.quit` | `{path}` / `{path?}` / `{path?, format?, artboard?, range?, scale?, …}` | `app.open` reads every format `document.open` reads (see `document.formats`) and returns its result (`{index, title, format, warnings, …}`; `warnings` say what didn't come in as it was, such as an EPS shown as its preview image and why its PostScript couldn't be read), or null when a dialog asks first or a library loads. `app.export` encodes through the engine's `document.export` (same options; the document keeps its path) and writes `path` through the host; without `path` it returns `{dataBase64, format, bytes}`, as headless mode does. `app.quit`, `file.close` and `file.closeAll` first open a `saveChanges` dialog for each modified document (they return `{"pending": "saveChanges"}`): `ui.dialog.confirm` saves, `ui.dialog.set {field: "discard", value: true}` then confirm discards, `ui.dialog.cancel` cancels the whole close or quit |
| `app.export` with `useArtboards` | `{path, useArtboards: true, range? \| artboards?, …}` | Export As: PNG, JPEG and WebP write one file per chosen artboard (default all; SVG does so for a `range`), `<path stem>-<artboard>.<ext>`, and return `{path, files: [path…]}`; a PDF keeps them as pages of `path`. `useArtboards: false` covers the bounds of the visible art. The menu's Export As… is `file.exportAs`: the `exportAs` dialog (`format`, `useArtboards`, `all`, `range`), then a save dialog and the format's options: `pngOptions` / `jpgOptions` / `webpOptions`, `svgOptions`, or `savePdf` for a PDF with Use Artboards |