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Fix #457: paste screenshots from the clipboard on macOS, Windows and the web

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A screenshot on the clipboard didn't paste everywhere:
- macOS: the Paste menu item (which takes Cmd+V there) was enabled for text
  only, so with nothing copied in the app Cmd+V did nothing; and arboard
  reads the pasteboard's TIFF only. The pasteboard's types now enable Paste,
  and its PNG, else TIFF, pastes as it is.
- Windows: bitmaps came through CF_BITMAP and GetDIBits, which drops alpha.
  Paste now reads PNG, else CF_DIBV5, else CF_DIB, decoded with their colour
  masks and tables (a BMP file header in front, which image's headerless
  decoder gets wrong for masks after a BITMAPINFOHEADER), opaque when the
  alpha is zero throughout as screenshots leave it, capped at 32768 px a side.
- Web: only SVG text pasted. The page's paste event now hands the first
  picture or file that is art to the app (VectorcraftApp::paste_from_host),
  pasted with the chord held, like the desktop's paste keys.
- Linux reads image/png already; its Paste menu item still waits for text
  (no cheap way to ask arboard for a bitmap), the paste keys take one.

Bitmaps paste as embedded images at the view centre, as before.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
bflatastic
2026-10-08 16:15:20 +07:00
co-authored by Claude Opus 5.5
parent f22c100cc5
commit 8f771faa9e
11 changed files with 351 additions and 37 deletions
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docs/control-protocol.md
+5 -3
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@@ -304,8 +304,9 @@ the same); the last one runs the paste with `swatchConflict`. `ui.dialog.cancel`
Paste placement: through the app, `edit.paste` and `edit.pasteWithoutFormatting` without `center`, `dx` or `dy`
paste at the centre of the view. The Paste menu items are enabled while the system clipboard holds something to
paste (SVG, PDF, text or a bitmap on the desktop; SVG on the web), even with nothing copied in the app (looked at up
to four times a second; `ui.menu.list` shows it). The Layers panel menu (≡ on
paste (SVG, PDF, text or a bitmap on Windows; text or a bitmap on macOS; text on Linux, whose paste keys still take a
bitmap; SVG on the web, whose paste keys also take pictures and files), even with nothing copied in the app (looked
at up to four times a second; `ui.menu.list` shows it). The Layers panel menu (≡ on
the dock's tab strip while Layers shows) lists the layer commands (New Layer…, Duplicate and Delete Selection,
Options for Selection…, clipping mask, isolation, Locate Object, Merge Selected, Flatten Artwork, Collect in New
Layer, Release to Layers, Reverse Order, Template, Hide/Outline/Lock Others or Show/Preview/Unlock All Layers), Paste
@@ -346,7 +347,8 @@ System clipboard formats: through the desktop app, `edit.copy` and `edit.cut` pu
lists to the system clipboard, and every Paste command first loads what another app copied (`clipboard.importSvg`,
`importPdf`, `importText` or `importImage`, centred in the view); an import error answers the Paste with that error
and pastes nothing. Cmd+V also pastes a bitmap or PDF with no text beside it (on the key's release, as egui sends no
Paste event for it).
Paste event for it). Screenshots paste on every platform: Windows reads `PNG`, else `CF_DIBV5`/`CF_DIB`, macOS the
pasteboard's PNG or TIFF, Linux `image/png`, and the web the picture the browser's paste event carries (#457).
File menu details: `file.openRecent1`…`file.openRecent30` open the recent files the `recentFilesCount` preference
lists (0 hides them all; `file.recentFiles` returns the listed paths), `file.reveal` shows the document's file in the