THPDFDocComparison.CompareWithOptions

Runs structural, page or perceptual rendered comparison with caller-selected resource limits and render thresholds

Declaration

class function CompareWithOptions(DocA, DocB: THotPDF;
  Mode: THPDFComparisonMode;
  const Limits: THPDFStructuralCompareLimits;
  const RenderOptions: THPDFRenderedCompareOptions): AnsiString;

Parameters

• DocA and DocB are loaded documents
• Mode selects the comparison surfaces
• Limits bounds structural traversal, page count, and retained differences
• RenderOptions selects DPI, colour metrics, thresholds, regions, overlays and pixel budgets

Result

Returns deterministic JSON with normalised options, aggregate completeness, differences and per-page rendered metrics when rendering is selected

Rendering and overlay errors fail closed as reported differences and make the comparison incomplete

Example

Limits := THPDFStructuralCompareLimits.Default;
RenderOptions := THPDFRenderedCompareOptions.Default;
RenderOptions.DPI := 144;
RenderOptions.ColorTolerance := 3;
RenderOptions.MinimumSimilarity := 0.995;
RenderOptions.MaxChangedPixelRatio := 0.001;
RenderOptions.GenerateHeatmaps := True;
RenderOptions.HeatmapDirectory := 'comparison-output';

Report := THPDFDocComparison.CompareWithOptions(
  BeforeDocument, AfterDocument, cmFull, Limits, RenderOptions);

See also

THPDFRenderedCompareOptions · THPDFStructuralCompareLimits · Document Comparison