Adds a highlight annotation over the text in quadrilaterals, filled in its colour under the Multiply blend mode.
public PdfHighlightAnnotation AddHighlightAnnotation(IReadOnlyList<PdfQuadrilateral> quadrilaterals, PdfAnnotationOptions? options = null)
One quadrilateral per run of text, its points top left, top right, bottom left, bottom right of the text.
Colour, flags and markup texts; null for yellow.
ISO 32000-2 §12.5.6.10, Table 182 (PDF 1.3).