feat: add vector graphics extraction with path verbs, CTM, and opacity support#72
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…y support Implements issue #66 Phase 1: core vector path extraction from PDF content streams. - New VectorParser (internal/extractor) with full graphics state stack (q/Q), CTM tracking (cm), fill path capture, curve operators (c/v/y), and all painting operators (S/f/F/B/B*/s/b/b*/f*/n) - VectorPath domain type using verb+coords pattern compatible with gogpu/gg - PathVerb (MoveTo/LineTo/CubicTo/QuadTo/Close) and PaintMode enums - CMYK to RGB conversion (K/k operators), grayscale (G/g), ExtGState opacity - Public API: Document.GetVectorGraphics, GetVectorGraphicsWithError, GetVectorGraphicsForPage (0-based page index) - 50+ unit tests (operator dispatch, CTM, state stack, CMYK, clamp, colors) - 14 integration tests (Creator round-trip, verb/coords consistency, fill/stroke detection, cubic bezier verification, color range validation)
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Summary
Document.GetVectorGraphics(),GetVectorGraphicsWithError(), andGetVectorGraphicsForPage()for extracting vector paths from parsed PDFsVectorParserseparate from existingGraphicsParser— all table detection functionality untouchedq/Qsave/restore stack, CTM tracking viacm, ExtGState opacity (/CA,/ca)S/s), fill (f/F/f*), fill+stroke (B/B*/b/b*)c,v,yoperators), rectangle expansion to path segmentsK/koperatorsCloses #66
Test plan
go fmt ./...cleango vet ./...cleango test ./...— 23 packages, all passinggolangci-lint run— no new issuesGraphicsParsertable detection tests still pass