PdfStructuredText
data class PdfStructuredText(val pageWidth: Double, val pageHeight: Double, val blocks: List<PdfTextBlock>)
Structured text: pageGlyphs → spans → lines → blocks (ISO 32000-1 §14.8 is the spec basis; MuPDF's fz_stext_page is the architectural reference).
The renderer text-state-machine already knows how to turn Tj/TJ plus the text-matrix stack into positioned glyph runs. We hijack it: a recording canvas captures every drawText call, then a layout pass clusters those positioned spans into reading order.
Use this when:
you want copy/paste-quality text (preserves spacing, line breaks)
you need to highlight/search a region of the page
you need geometric data alongside the text (positions, fonts)
For a raw concatenated string, PdfPage.extractText is still simpler and cheaper.