Main took hayro-syntax patches 26 and 27 (xref streams), so the patch
that keeps up to 256 operands per instruction moves to 28 in
vendor/README.md and in every comment that cites it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0175FWj4xFhMhSH3UpMU8DSC
ISO 32000-2 §8.6.6.5: "DeviceN colour spaces (PDF 1.3) may contain an
arbitrary number of colour components", and scn takes one operand per
component. The content parser (vendored hayro-syntax) held ten operands
per instruction; pushing the eleventh failed, and the failure ended the
whole content stream. A twelve-ink background fill therefore drew
nothing, and nothing after it was drawn either: a blank page, no error.
hayro-syntax patch (26): an instruction keeps up to 256 operands (enough
for the largest DeviceN space the interpreter reads, 255 inks, plus a
pattern name). Past that the oldest are dropped, in order, rather than
the stream ending: operators already read the operands nearest to them,
so this is how stray operands are treated below the cap too.
hayro-interpret patch (55): a Separation or DeviceN tint transform that
can't be read no longer makes the colour space unreadable (its paints
were drawn in DeviceGray from the first tint, white for a full tint);
it keeps the space, and like a transform that fails when evaluated it
paints that colour in the alternate space's initial colour. Those
fallbacks, and a cs/CS colour space that can't be read, were silent:
they are reported once per content stream as
InterpreterWarning::ColorFallback, which pdfcraft-render records as
RenderWarning::ColourFallback and pdfcraft-cli render prints.
Tests, each seen failing with its fix reverted: the report's twelve-ink
page paints black and draws what follows; a four-ink control; 300 stray
operands before rg still draw; a calculator tint transform that pops
too much, and an unknown function type, fall back with one warning and
the rest of the page drawn; hayro-syntax keeps all twelve scn operands
and, past the cap, the latest 256 in order (fails without the reorder).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0175FWj4xFhMhSH3UpMU8DSC
