Add Processing-style showcase example#2
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This provides a standalone single-runner Xlib client with clickable tabs cycling through primitives, analog clock, Bezier curves, fractal tree, and waves scenes. Drives XFillPolygon, XDrawLines, XFillArc, XDrawString, pointer/key input, and timed redraws against the libX11-compat. Promote XFillPolygon from a WARN_UNIMPLEMENTED stub to a scanline-fill implementation so the primitives and tree scenes render. Validates the Complex/Nonconvex/Convex shape and CoordModeOrigin/CoordModePrevious mode arguments, supports both EvenOdd and Winding fill rules, and honors the active GC clip stack.
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Standalone single-runner Xlib client with clickable tabs cycling through primitives, analog clock, Bezier curves, fractal tree, and waves scenes. Drives XFillPolygon, XDrawLines, XFillArc, XDrawString, pointer/key input, and timed redraws against the libX11-compat SDL2 backend.
Promote XFillPolygon from a WARN_UNIMPLEMENTED stub to a scanline-fill implementation so the primitives and tree scenes render. Validates the Complex/Nonconvex/Convex shape and CoordModeOrigin/CoordModePrevious mode arguments, supports both EvenOdd and Winding fill rules, and honors the active GC clip stack.
Summary by cubic
Adds a tabbed Processing-style showcase example and implements a scanline
XFillPolygonso polygon scenes render correctly with clipping, fill rules, andGXinvert.processingexample: single-runner with tabs (primitives, clock, Bezier, tree, waves). Uses pointer/key input (Esc/q, 1–5) and timed redraws. ExercisesXFillPolygon,XDrawLines,XFillArc, andXDrawString. Added to build and docs.XFillPolygon: scanline fill with validation of shape (Complex/Nonconvex/Convex) and coord modes (Origin/Previous), supports EvenOdd and Winding, honors the GC clip stack, and handlesFillSolid(includingGXinvertspan inversion) andFillOpaqueStippled.XFillRectanglesand polygon spans to implementGXinvert.Written for commit d1e19e3. Summary will update on new commits.