Port PeachPDF's CSS Fragmentation engine for real page-break support - #263

Open

jhaygood86 wants to merge 31 commits into

ArthurHub:masterfrom

jhaygood86:feature/fragmentation-engine-parity

Commits on Aug 21, 2026

Wire the CSS Fragmentation vocabulary CssEngine already parses
jhaygood86
committed
a56ec43
Add the immutable fragment record types (Fragments/)
jhaygood86
committed
7833caa
Add the fragmentation classification and break-token types
jhaygood86
committed
5e9321d
Produce a trivial single-fragmentainer FragmentTree after layout
jhaygood86
committed
daab5d2
Add a minimal FragmentPainter that paints from the fragment tree
jhaygood86
committed
27663ae
Add block-level page-break corrections (D2)
jhaygood86
committed
10f792d
Bucket the fragment tree into one fragmentainer per page
jhaygood86
committed
2e2e968
Add inline-flow page-break corrections: real widows/orphans (D3)
jhaygood86
committed
90729d4
Add table fragmentation: row-level avoidance and repeated <thead> (D4)
jhaygood86
committed
7f30f40
Cut PdfGenerator over to page-per-fragmentainer rendering (F1)
jhaygood86
committed
3b840f0
Make FragmentPainter the default paint path for WinForms/WPF (F2)
jhaygood86
committed
dc2099e
Remove the crude per-word/per-box BreakPage nudge (F3, partial)
jhaygood86
committed
b056b6c
Add real per-type fragment content painters (image/hr/frame/marker)
jhaygood86
committed
b7fc8c9
Fix multi-page PDF text/image invisibility, delete CssBox.Paint/PaintImp
jhaygood86
committed
3914ffc
R0: paint text from the fragment tree, not live CssRect geometry
jhaygood86
committed
fda44e3
R1: real resumable pass loop for forced page breaks
jhaygood86
committed
b5b1408
R3: break-inside:avoid/monolithic relocation via real relayout (R2 folded in)
jhaygood86
committed
8903205
R4: real keep-with-next, fixing a genuine pre-existing gap
jhaygood86
committed
d8c4c00
R5/R6: neither needed new resumption machinery - fixed real bugs instead
jhaygood86
committed
380a207
Fix R1 regression: forced breaks nested inside table cells corrupted layout
jhaygood86
committed
03aa597
R7: table content already benefits from R1-R6 fixes; one known limitation documented
jhaygood86
committed
4360e0c
R9: keep-with-next across a real pass boundary already works; no rewind needed
jhaygood86
committed
23cd304
Fix catastrophic layout corruption when a keep-with-next run exceeds one page
jhaygood86
committed
cb1bdf9
R10: delete dead break-token/relaxation scaffolding never wired up
jhaygood86
committed
0496e67
Fix orphans never enforced on a paragraph's first page-fragment
jhaygood86
committed
f41c56d
Fix rowspan cells silently skipped by the table's break-inside:avoid row-shift
jhaygood86
committed
07f4a09
Fix container-left-behind: a moved box's ancestor now follows it up
jhaygood86
committed
45ede10
Document that list markers survive container relocation without help
jhaygood86
committed
5f56ad2

Navigation Menu

Port PeachPDF's CSS Fragmentation engine for real page-break support - #263

Port PeachPDF's CSS Fragmentation engine for real page-break support#263
jhaygood86 wants to merge 31 commits into
ArthurHub:masterfrom
jhaygood86:feature/fragmentation-engine-parity

Commits on Aug 21, 2026

Wire the CSS Fragmentation vocabulary CssEngine already parses

Add the immutable fragment record types (Fragments/)

Add the fragmentation classification and break-token types

Produce a trivial single-fragmentainer FragmentTree after layout

Add a minimal FragmentPainter that paints from the fragment tree

Add block-level page-break corrections (D2)

Bucket the fragment tree into one fragmentainer per page

Add inline-flow page-break corrections: real widows/orphans (D3)

Add table fragmentation: row-level avoidance and repeated <thead> (D4)

Cut PdfGenerator over to page-per-fragmentainer rendering (F1)

Make FragmentPainter the default paint path for WinForms/WPF (F2)

Remove the crude per-word/per-box BreakPage nudge (F3, partial)

Add real per-type fragment content painters (image/hr/frame/marker)

Fix multi-page PDF text/image invisibility, delete CssBox.Paint/PaintImp

R0: paint text from the fragment tree, not live CssRect geometry

R1: real resumable pass loop for forced page breaks

R3: break-inside:avoid/monolithic relocation via real relayout (R2 folded in)

R4: real keep-with-next, fixing a genuine pre-existing gap

R5/R6: neither needed new resumption machinery - fixed real bugs instead

Fix R1 regression: forced breaks nested inside table cells corrupted layout

R7: table content already benefits from R1-R6 fixes; one known limitation documented

R9: keep-with-next across a real pass boundary already works; no rewind needed

Fix catastrophic layout corruption when a keep-with-next run exceeds one page

R10: delete dead break-token/relaxation scaffolding never wired up

Fix orphans never enforced on a paragraph's first page-fragment

Fix rowspan cells silently skipped by the table's break-inside:avoid row-shift

Fix container-left-behind: a moved box's ancestor now follows it up

Document that list markers survive container relocation without help

Commits on Aug 22, 2026

Preserve table rows unfragmented by default, per css-tables-3 6.1

Repeat position:fixed content on every page, per css-position-3

Fix CI page-count tests fragile to font substitution on non-Windows