windows: adopt custom clipboard formats via RegisterClipboardFormat (#17)#132
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) Wire the custom-format seam into the Windows backend: read/write's default case resolves a custom Format token to its MIME string, registers it as a clipboard format with RegisterClipboardFormat, and stores/reads the bytes verbatim through global memory (raw passthrough, no conversion). readCustom sizes the read with GlobalSize; writeCustom mirrors the existing text/image write path. Watch works for free (polls Read via the sequence number). Built-in CF_UNICODETEXT/CF_DIBV5 paths are unchanged (the former default-to-text fallthrough is now explicit). Adds GlobalSize to the kernel32 procs and a windows TestCustomFormatRoundTrip.
This was referenced Jun 6, 2026
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Backend PR of the custom clipboard formats design (spec). Builds on #128–#131. Refs #17, #40.
Scope (Windows backend)
read/writedefaultcase resolves a customFormattoken to its MIME string, registers it viaRegisterClipboardFormat, and stores/reads bytes verbatim through global memory — raw passthrough, no conversion.registerCustomFormat,readCustom(sized viaGlobalSize),writeCustom.GlobalSizekernel32 proc.Watchworks for free (sequence-number poll +Read).CF_UNICODETEXT/CF_DIBV5paths unchanged — the previous default-to-text fallthrough is now an explicitFmtTextcase so custom tokens no longer fall through to text.Tests
clipboard_custom_windows_test.goruns the sharedcustomRoundTrip(raw bytes incl. NUL + non-UTF-8 through a registered format andReadAs) on thewindows-latestjob.Verified locally via cross-compile + test-compile for
windows/amd64andwindows/386.