A plug-in whose manifest gives "api": 2 and lists the new `progress`
permission may import three host functions from module `env`:
vc_progress(done, total), vc_cancelled() -> i32 and
vc_log(level, ptr, len) -> i32. Installing checks every import and
refuses, by name, one the host doesn't offer, one with another type and
one the manifest doesn't allow.
- Progress is clamped and passed on once per tenth of a percent (past
2,000 reports, once per 1,000 changes). A heavy filter's progress
window and the export's progress window show it as a percentage bar,
and their Cancel makes vc_cancelled return 1. A live effect's progress
is not shown.
- A run cancelled before it returns ends as cancelled, and one that
returns after its time budget ran out ends at that budget, so what a
plug-in returns after it sees vc_cancelled changes nothing. This also
applies to a plug-in of API level 1 that finishes after a Cancel or
past its time budget.
- Log text must lie in the module's memory and be UTF-8. Lines go to the
app's log as "<id>: <text>" with hidden characters escaped, at most
1,024 characters a line, 200 lines and 32 KiB a run, and the host reads
at most 1 MiB of log text a run.
- plugin.list and plugin.info give the manifest's `api`; the install
prompt names the new permission in plain words.
Docs: docs/plugins.md, docs/mcp.md, docs/target-app-parity.md.
Export for Screens and the Asset Export panel's Export encoded and wrote
every file on the UI thread, so the window stopped responding until the
last file was written. For 50 artboards in PNG at 1x, 2x and 3x, PDF and
SVG (250 files, 47 MiB), the dialog's OK took a median of 43.8 s in a
release build on Windows.
With Enable Background Export on (Preferences › File Handling), OK now
checks the settings, remembers them and takes a snapshot of the
document, and the dialog closes. The thread that writes background
saves and exports then encodes the files and writes them into the
folder, or one ZIP in it, and the export progress dialog's Cancel stops
it before the next file. The same OK takes under 0.001 s, and the files
have the same names and bytes. With the preference off, without a
folder, on the web and over MCP and scripts (document.exportForScreens
and assets.export), the files are made at once with the same reply as
before.
Both commands report one progress step per file, so the progress dialog
shows "File 3 of 250" and MCP progress notifications count the files in
place of the encoders' artboards and pages.
Docs: docs/target-app-parity.md, docs/control-protocol.md, docs/mcp.md.
While an export runs in the background (Background Export), a dialog shows
what is being exported and how far it has got: artboard by artboard for a
raster export of several artboards, busy otherwise. Cancel (also Esc) stops
it and writes no file; Continue in Background leaves it to the status bar.
It opens after 0.4 s and never over another dialog.
Built on the shared vectorcraft_doc::cancel (#2546): fileio::progress::Progress
wraps its CancelToken and a progress sink, so a cancelled export stops
drawing and keeps no half-drawn pattern tile or effect raster.
- ui: background jobs carry their Progress; export_progress draws the
dialog; UI commands file.cancelExport and file.exportInBackground.
- i18n: the strings in every language with complete menus, Danish, Dutch
and Indonesian included; "{n} more exports waiting" is a plural (trn).
- docs: ui-parity, gaps (G12) and ROADMAP rows.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Dt49z1ubK9x1bPq51APgz3
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