Shared graph drawing and enhanced-metafile export

This continuation covers Statistics and Revision Graph drawing, file encoders and captured Save ownership. It does not certify either complete dialog.

Pinned source contract

TortoiseGit 7338078f8ddd924b8cddee35f512f2286072136d writes enhanced EMF under the .wmf suffix using CreateEnhanced in src/TortoiseProc/StatGraphDlg.cpp:1472–1483 and src/TortoiseProc/RevisionGraph/RevisionGraphWnd.cpp:814–831. Statistics renders its current graph viewport. Revision Graph temporarily uses default zoom, draws its graph and restores zoom. A separate classic WMF encoder is not required by these source branches. TurtleGit accepts both .wmf and explicit .emf as aliases for enhanced EMF. Statistics restores the source .wmf extensionless Pictures default; Revision Graph retains .svg for Pictures and .gv for Graphs.

The user-provided layout2vector repository, pinned at 2e0a96b9f87f2a8c0ff649963a67dfccd73bf5bb, provided a separate writer reference. The native implementation uses an original shared display list and Core writer; it does not rasterize an entire graph or execute foreign renderer code.

Shared native scenes

GraphVectorScene carries ordered paths, fills, strokes, clips, text and explicit local bitmaps in top-left coordinates. Native drawing, PDF, SVG, enhanced EMF and raster exports consume this scene. Graphviz remains topology serialization.

Revision Graph retains row colors, rounded clipping, edge directions, both selection markers, Base captions and configured native fonts. Vector exports use unit zoom and raster exports use current zoom. Statistics retains the five graph styles, summary/metric options, source palette, axes, averages, author identities, legend and viewport rules. Native chart hover regions and accessibility labels are derived with the chart geometry, including zero-valued data points.

CoreText shapes each label with actual fallback fonts. SVG/EMF encode glyph paths rather than depending on fonts installed on another computer. Color-font and bitmap-only labels retain native appearance using bounded label-local RGBA images; other geometry stays vector. SVG labels consequently are not editable text; escaped descriptive metadata preserves raw label spelling. This differs from upstream SVG text elements. PDF retains native text. None of these choices proves identical Windows font metrics, antialiasing or GDI pixels.

The enhanced-EMF writer uses a real header, 32-bit paths, cubic curves, fill rules, saved clips and geometric pens. Dynamic system edge colors are resolved over the captured canvas background before encoding opaque vector pens; native and export share the resulting paint. It preserves fractional positions through a 1/64 logical-unit world transform. Local images use premultiplied alpha records. It refuses unresolved text, nonopaque vector paints, invalid/unbalanced state, nonfinite geometry and oversized inputs rather than silently flattening a graph. The limits include one-million-unit page/coordinate bounds, 100,000 commands, 500,000 path segments, 64 MiB output and sixteen megapixels of local bitmap data. Raster exports retain separate bounded allocation limits.

Captured save and cancellation

Both owners capture immutable graph content, size, appearance and settings before showing Save. Acceptance freezes the final URL, encoder and writer exactly once. Actual panel detachment precedes rendering/writing. The shared staged writer uses a same-volume replacement workspace and checks cancellation during work and before publication. A cancelled unpublished save preserves an existing file.

Forced close retires the UI and cancels work; actual workers and child sheets remain accounted for until they drain. Quit observes that ownership. Duplicate, late and retired panel replies cannot publish another file. Hidden Revision Graph command output retains its existing scoped prepared-file publication.

Validation and remaining work

The dated grouped checkpoint records 31 distinct Core methods and 24 native case/engine combinations passing across recorded focused repairs. Actual output headers/records and decoded geometry, Unicode label ink, source palettes, five Statistics styles in both appearances, Revision Graph markers/arrows and native save/close/Quit ownership were checked. All 25 receiver attempts, including the failed attempt, are independently absent. Two complete Statistics chart captures were reviewed and updated on the website. Earlier save and metafile-reader checkpoints do not independently certify this new graph writer or renderer.

Physical keyboard/VoiceOver behavior, Windows pixel/font identity, very large repository performance, signed sandbox grants and replacement on deployment volumes, minimum-OS/Intel acceptance, current complete hosted CI and complete upstream dialog parity remain open.