fix: keep oversized inline image on one page in DOCX rendering - #134
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shps951023 merged 3 commits intoSep 5, 2026
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An inline image that did not fit in the remaining page space was clipped at the page bottom and lost, because RenderImage called EnsurePage(), whose guard only adds a page once the cursor is already past the bottom margin. Force the break when the image would cross the margin so the whole image moves to the next page, matching Word/LibreOffice. Skip when already at the top of a fresh page so an image taller than the usable area still overflows instead of emitting a blank page. Benchmark: docx_classic30_comprehensive_report overall 0.9086 -> 0.9888, visual 0.7759 -> 0.9765 (page 3). Full .NET suite 185/185; XLSX+DOCX visual regression gate 0 regressions.
Add a regression test asserting an inline image that does not fit in the remaining page space moves wholesale to the next page instead of being clipped at the page bottom. Fails against the pre-fix EnsurePage() behavior.
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Included review availability: Your plan provides up to 2 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughChangesThe converter now advances a non-fitting inline image to the next column when possible. It forces a new page after the final column or outside column flow. A regression test verifies that a tall image is not clipped. Inline image pagination
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to Oversized inline images now move to a later column or page instead of being clipped at the bottom margin. The change includes regression coverage and has no remaining identified merge-blocking risk. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Inline comments:
In `@src/MiniPdf/DocxToPdfConverter.cs`:
- Around line 3372-3373: Update the page-break logic around state.ForceNewPage()
to preserve multi-column flow: when the image fits within the usable full-column
height, call AdvanceToNextColumn() first, and only force a new page after the
last column or when the image exceeds that height. Preserve the existing
top-of-page behavior and use the surrounding state.Options and column
configuration symbols to determine the applicable limits.
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The previous fix always called ForceNewPage() when an inline image did not fit in the remaining space. In a multi-column section that skipped the remaining columns and broke the page prematurely. Mirror EnsurePage()'s column handling: advance to the next column first, and only force a new page when no column remains.
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Problem & intended behavior
When a DOCX inline image does not fit in the remaining space on the current
page, MiniPdf drew it at the current cursor and let the page boundary clip it,
so the image was lost and the next page began with only the following content.
Word and LibreOffice keep the image whole by moving it to the next page.
Intended behavior: an inline image that would cross the bottom margin is moved
in its entirety to the next page.
Root cause:
RenderImagecalledEnsurePage(), whose guard only adds a pageonce the cursor is already past the bottom margin. In the "image would cross
the margin" case the cursor is still on the page, so no page was added and the
image overflowed off the bottom edge.
Linked issues / discussion
N/A — isolated rendering fix, no API/architecture change.
Change
src/MiniPdf/DocxToPdfConverter.cs: force a page break when the image wouldcross the bottom margin so the whole image moves to the next page; skip when
already at the top of a fresh page so an image taller than the usable area
still overflows instead of emitting a blank page ahead of it.
tests/MiniPdf.Tests/DocxToPdfConverterTests.cs: add a regression test.Tests & validation commands
dotnet test tests/MiniPdf.Tests --configuration Release— 186/186 passing,including the new
Convert_InlineImageThatDoesNotFit_MovesToNextPageWithoutClipping(fails against the pre-fix
EnsurePage()behavior, passes with the fix).scripts/Run-Benchmark_docx.ps1 -Filter "classic30"(focused DOCX visual) — improvedscripts/Run-Benchmark_docx.ps1(full DOCX visual gate) — no regressionsscripts/Run-Benchmark.ps1(full XLSX visual gate) — no regressionsgit diff --check— cleanBefore/after evidence (rendering change)
Benchmark score (docx, LibreOffice reference):
Reproduced with the published
MiniPdf 0.41.1NuGet package (before) vs. thisbranch (after). Pages 2–3 shown below — page 2 = image clipped and lost at the
page bottom; page 3 = image correctly moved to the next page, matching the
LibreOffice reference:
Public API / compatibility impact
None. No public API change; behavior is unchanged for images that already fit.
Only the doesn't-fit-and-not-top-of-page path is affected.
Third-party material
None added.
Documentation
No user-visible API/CLI change; no documentation updates required.
Summary by CodeRabbit
Bug Fixes
Tests