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[api-minor] Support annotation flattening in extractPages (bug 2075337) - #22448
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## master #22448 +/- ##
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+ Coverage 90.57% 90.63% +0.06%
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Files 276 277 +1
Lines 68671 69314 +643
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- Misses 6474 6490 +16
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Add flatten and intent options to draw supported annotation appearances into page content. Use print or display visibility. Keep the widgets and the interactive annotations. Android 14's PdfRenderer calls PDFium without FPDF_ANNOT [1]. [1] https://android.googlesource.com/platform/frameworks/base/+/refs/tags/android-14.0.0_r1/libs/hwui/jni/pdf/PdfRenderer.cpp
With `flatten: true`, also draw the widgets, generating their appearances from the stored values, and remove the ones hidden for the intent. Prune the removed fields from the AcroForm, and remove it when no page widget remains, unless it declares signatures. Add a "non-forms" value to keep the form fields.
In a flat parent tree, replace the OBJR of a flattened annotation with a marked-content reference to its drawing in the page content. For other readable parent trees, only remove the OBJR.
Reuse the save path to flatten extracted pages. Remap pending form edits to copied annotations and reload with the encryption source's password. Rebuild the PDF to discard the unflattened revision.
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Reuse the save path to flatten extracted pages. Remap pending form edits to copied annotations and reload with the encryption source's password. Rebuild the PDF to discard the unflattened revision.