PDF Library for Delphi Automatic Font Fallback for CJK and Emoji Text
Resolve missing CJK, symbol and emoji glyphs in Delphi PDFs with PDF Library for Delphi font fallback, cluster-aware shaping and a JSON missing-glyph report
Software Development Blog
Delphi PDF Library
Delphi PDF Library: PDF Library for Delphi programming guides and examples
Automatic Structure Tagging for Accessible PDF in Delphi
PDF Library for Delphi tags text, headings, figures and tables as you draw them, so accessible PDF output no longer means wrapping every call in BeginTag
Embed AVIF, HEIF and JPEG XL Images in PDF from Delphi
PDF Library for Delphi embeds AVIF, HEIF and JPEG XL images in PDF, keeping the alpha, ICC profile and 16-bit channels that a bitmap conversion loses
Barcodes in PDF With Delphi: QR, PDF417, DataMatrix
Vector barcodes print crisply at any size. See how PDF Library for Delphi draws QR, PDF417, DataMatrix and Code128 symbols in Delphi with error correction
Delphi TIFF Decoder Hardening: BigTIFF and Tiled TIFF
How the PDFlibPas built-in Delphi TIFF decoder imports bounded BigTIFF, tiled and float TIFF, names every rejection and holds one 256 MiB decode budget
Catalog SpiderInfo Web Capture Commands in Delphi PDFs
PDF Library for Delphi writes Web Capture history into Catalog /SpiderInfo: one indirect command per fetch, with URL, link depth and only three legal flag bits
Emailing PDFs via CDO in Delphi: Apartment-Threading Gotchas
PDF Library for Delphi emails PDFs through Windows CDO, and correct CoInitializeEx apartment handling is what keeps multi-threaded batch sends from failing
CMS Signature Parsing in Delphi: DER Bounds and OID Arcs
How PDF Library for Delphi reads signer certificates from PDF signature CMS: parent-bounded DER reads, trimmed /Contents padding and OIDs that encode past 2.47
Delphi Code That Works by Accident: Five FPC Porting Traps
Five Pascal patterns that run clean on Delphi but fail on Free Pascal or malformed input: hidden result arrays, stale counts, short reads and 1-based offsets
Collate Duplex Scans in Delphi: PDF Interleave Merge
Merge front and reversed back scan PDFs into reading order with PDF Library for Delphi CollateDocumentsEx, interleaving pages without duplicating shared fonts
Building a Compliance and Signing Workbench in Delphi with PDF Library for Delphi
Wire PDF/A preflight, PAdES signing and ByteRange audits into one Delphi workbench with PDF Library for Delphi so the revision you validate is the one you sign
PDF Library for Delphi Content-Stream State: CTM and Clip Tracking
Replay a PDF content stream in Delphi with PDF Library for Delphi: track the CTM, text matrix, clip bounds, and the q/Q graphics-state stack for every operator
Converting a PDF to PDF/A and Repairing Its Metadata
ConvertToPDFA repairs a document, states the part it claims and checks the result, while RepairDocumentMetadata makes Info and XMP agree in Delphi
Cross-Document PDF Object Copy in Delphi: Handling Cycles
How PDFlibPas CopyForeignObject deep copies a PDF object closure across documents and resolves cyclic Parent back references with an explicit in-progress guard
Export TDataSet and Reports to PDF in Delphi
Export any TDataSet, FastReport, QuickReport or ReportBuilder report to PDF in Delphi using losLab PDF Library, with paginated tables and headless output
Deterministic PDF ID in Delphi for Reproducible Builds
Make Delphi PDF output byte identical with a deterministic trailer ID: how the seed is derived, why encrypted files keep theirs, and what else to pin
PDF Library for Delphi DLL, ActiveX, and dylib Bindings: Calling One PDF Engine from Any Language
PDF Library for Delphi exposes one flat PDF API as a Stdcall DLL, Safecall ActiveX object and Cdecl dylib, and the string and handle traps each binding hides
PDF Lifecycle Actions: Catalog /AA vs Page /AA in Delphi
PDF Library for Delphi attaches document actions such as WillClose and WillPrint to the Catalog /AA and page actions to the Page /AA, within the PDF/A limits
Ed448 and Brainpool ECDSA in Pure Pascal for PDF
How PDFlibPas implements RFC 8032 Ed448 and the three RFC 5639 Brainpool curves without an external crypto library, and six implementation traps worth knowing
Validating E-Invoices: veraPDF and Mustang in Delphi
PDF/A compliance is not invoice compliance. See how PDF Library for Delphi e-invoices pass both veraPDF container checks and Mustang business rules in Delphi
Embed Missing Fonts in Existing PDFs for PDF/A in Delphi
PDF/A error 00030 means a font program is missing. PDF Library for Delphi repairs loaded files via EmbedMissingFonts, linking it from the existing descriptor
PDFlibPas EMF Import: PolyDraw, Polyline and Bezier Rules
How PDFlibPas converts EMF PolyBezier, Polyline, PolylineTo, PolyPolyline and PolyDraw records into PDF paths per MS-EMF, with Delphi code and parser pitfalls
EMF Vector Import on Free Pascal With PDFlibPas
Why a 6500-line EMF to PDF converter needed a changed conditional, not a rewrite, and how a ULONG_PTR hatch field misaligns metafile records on Win64
Retrying Encrypted PDF Passwords in Delphi with PDF Library for Delphi
PDF Library for Delphi retries a wrong PDF password by recreating TPDFDocument on every attempt, not by resetting it in place, and stops after 16 tries
Auditing PDF Encryption and Permissions in Delphi with PDF Library for Delphi
Read the PDF /Encrypt dictionary like an auditor with PDF Library for Delphi: algorithm, key length, AES-256 R5 vs R6, permission bits and Identity filter traps
Factur-X and ZUGFeRD Hybrid Invoices in Delphi
An e-invoice is a PDF/A-3 with invoice XML embedded inside. See how PDF Library for Delphi builds Factur-X and ZUGFeRD hybrid invoices across profiles in Delphi
Fast PDF Merge in Delphi: Byte-Level Ref Shifting
PDF Library for Delphi merges PDFs fast by reusing source bytes and shifting indirect references object by object, skipping the parse and reserialize round trip
FDF Annotation Import in Delphi: Avoiding the Silent Zero
Why an FDF annotation importer can count comments it never adds, how losLab PDF Library parses FDF keys, Rect and decimals, and how to verify imports in Delphi
FDF, XFDF and XFA Form Data Interchange in Delphi
Move PDF form data between AcroForm and business systems in Delphi with losLab PDF Library: FDF and XFDF values, hierarchical fields, rich text and XFA XDP
FieldMDP in Delphi: Detecting Edits to Locked Form Fields
Find out whether a signed PDF form had a locked field edited later. PDFlibPas resolves full field names per revision and applies FieldMDP rules in Delphi
PDF File Size Audit in Delphi: Byte Breakdown by Category
How AuditDocumentSpace in losLab PDF Library breaks a PDF file size down into 12 object categories in Delphi, so you measure bloat before you compress it
Flattening PDF Form Fields: BBox, Matrix, and the Moving Index
A flattened PDF field can shift if its coordinate systems are misunderstood. Map BBox and Matrix to Rect and flatten form fields safely in Delphi
Form XObject Recursion: PDF Library for Delphi Cycle Detection in Delphi
PDF Library for Delphi EnumPageContentStatesEx recurses into Form XObjects, detecting cycles by call chain and scoping duplicate resource names correctly
Chunked zlib on FPC: Why FlateDecode Needs One Stream
Why a chunked FlateDecode writer on Free Pascal must keep one zlib state: per-chunk zlib members get cut short by readers, and how to verify a single stream
FPC Win32 OMF to COFF Object Linking in PDFlibPas
Free Pascal on Win32 needs COFF objects, so PDFlibPas keeps a separate object set, normalizes section names and drops the Delphi 64-bit integer helper ABI
GeoPDF in Delphi: Geospatial Coordinates With PDF Library for Delphi
PDF can carry a map coordinate system. See how PDF Library for Delphi reads GeoPDF viewports, measure dictionaries and WKT or EPSG geographic frames in Delphi
GoToR, GoToE, and Launch Actions in Delphi PDFs
PDF Library for Delphi writes GoToR, GoToE and Launch actions, and one-based versus zero-based remote page numbers decide which page a cross-file link opens
Honest PDF Load/Save Benchmarks in Delphi: Noise Gates
How PDF Library for Delphi times LoadFromFile and SaveToFile with QueryPerformanceCounter, paired A/B runs, a 25% CPU start gate and three output checks
Flexbox, CSS Grid and Footnotes in PDF from Delphi
PDF Library for Delphi lays out HTML with display flex and grid inside PDF pages and paginates footnotes across columns and pages with continuous numbering
PDFlibPas HTML to PDF: Single-Pass Entity Decoding
Why a two-pass HTML renderer must decode entities exactly once, how PDFlibPas re-escapes text at every boundary, and how to escape user input safely in Delphi
PDF Library for Delphi Hyphenation and Balanced Text Columns in Delphi
Flow PDF text through balanced columns with language-aware hyphenation in Delphi using PDF Library for Delphi DrawTextFlowColumns and SetTextFlowHyphenation
Identity Tm in PDF Content Streams: Safe Peephole Removal
Why PDF Library for Delphi removes 1 0 0 1 0 0 Tm only while the text matrix and text line matrix are still identity, so the peephole optimizer never moves text
PDF Incremental Updates in Delphi: AppendToStream Guide
Write ISO 32000-1 incremental updates in Delphi with losLab PDF Library's AppendToStream: preserve digital signatures and skip full rewrites of large PDFs
PDFlibPas MovePage: When Inherited Boxes Share Instances
How PDFlibPas keeps MovePage, SetPageBox and CopyPageRanges from sharing page box instances, so editing one Delphi PDF page never resizes its siblings
OnExit Reentrancy in a Delphi In-Place Form Editor
PDF Library for Delphi TPDFlibViewer commits in-place form edits through OnExit; nil FInplaceEditor first or a focus loss reenters the commit and corrupts data
Interactive PDF Forms in Delphi: Actions and JavaScript
PDF form actions turn a static page into an app. See how PDF Library for Delphi wires Hide, ImportData, Named and JavaScript actions to fields and links
Build an Interactive PDF Viewer in Delphi with TPDFlibViewer
Build an interactive PDF viewer in Delphi VCL with TPDFlibViewer: five mouse tools, ready-made actions, search hit highlighting, annotation clicks and printing
JBIG2 Custom Huffman Tables in a Pure Pascal PDF Decoder
How the PDFlibPas pure Pascal JBIG2 decoder parses Tables segments, assigns canonical prefix codes per T.88 Annex B and keeps refinement reads in one segment
JBIG2 Encoder Backends and the Free Pascal Linker
Plug a DLL-based JBIG2 encoder into PDFlibPas through RegisterJBIG2EncoderBackend, invert the DIB bit polarity, and see why Free Pascal rejects raw C++ objects
PDFlibPas JBIG2 Halftone Grids: HSKIP and Negative Offsets
Two JBIG2 halftone traps in Delphi: index the HSKIP skip mask as T.88 defines it, and place negative grid offsets with a portable floor shift instead of shr
JBIG2 Random-Access Files: Decoding Them in Delphi
How PDFlibPas decodes JBIG2 random-access files in Delphi: indexing segment headers up to the end-of-file header, strict length checks, and no copied data
Static Linking jbig2enc Into Free Pascal Without a DLL
PDFlibPas links the jbig2enc backend into Free Pascal executables with no DLL. How ObjConv clears pick-any COMDAT and FPC internal error 200603061
Merging and Splitting Gigabyte PDFs in Delphi with PDF Library for Delphi Direct Access
Open gigabyte PDFs in milliseconds with PDF Library for Delphi direct access: page handles, streaming merge lists, range extraction and xref repair
Delphi Linux64 LP64 Pitfalls: Longint, Pointers and WIN64
Delphi Linux64 LP64 traps met while porting PDFlibPas: 8-byte Longint, TStream override signatures, binary records and why WIN64 is no pointer-width test
Locale-Neutral PDF Numbers for Comma-Decimal Delphi Apps
PDFlibPas writes PDF numbers with a dot and no exponent on comma-decimal systems and parses content streams, SVG and clip strings without the Delphi locale
LZW EarlyChange in Delphi: Encoder Leads the Decoder
The LZW encoder dictionary leads the decoder by one entry, so the two sides need different code width thresholds. How PDFlibPas gets EarlyChange right
PDF Garbage Collection in Delphi: Mark and Sweep
Why deleting PDF pages does not shrink the file, and how mark-sweep garbage collection in Delphi drops orphaned objects using the trailer root set
Memory-Mapped PDF Reading in Delphi: Sliding Window
PDFlibPas maps gigabyte PDFs through one sliding read-only window, so LoadFromMappedFile serves Delphi object slices without seek traffic or extra buffers
Merging PDF Forms in Delphi: Duplicate Field Rules
PDF Library for Delphi merges AcroForm documents with an explicit duplicate field policy that rejects, shares or renames same-named fields safely
ML-DSA in Delphi: FIPS 204 Post-Quantum in PDFlibPas
PDFlibPas implements FIPS 204 ML-DSA 44, 65 and 87 in pure Object Pascal for Delphi and FPC, covering the shared engine and sampling traps that break the KAT
Classifying What Changed in a PDF After It Was Signed
PDFlibPas compares a document against an earlier revision and sorts every difference into a whitelist, so DocMDP enforcement becomes a single level comparison
Render PDF Pages to 1-Bit Monochrome in Delphi
Render PDF pages to 1-bit monochrome bitmaps and clip a sub-region with PDF Library for Delphi, using GDI halftone down-conversion outside the renderer
Mixed Raster Content in Delphi: Scanned PDF to JPEG + CCITT
Compress scanned PDF pages in Delphi with CompressPageAsMRC: a downsampled JPEG background plus a full-resolution CCITT stencil mask that keeps text sharp
Multi-Engine PDF Rendering in Delphi: Built-in, Cairo, and PDFium with PDF Library for Delphi
Switch between built-in, Cairo and PDFium renderers per file in PDF Library for Delphi: engine probes, DPI scaling traps and a fallback chain that logs itself
PDFlibPas Name Trees: Cycles, Bad Limits and Huge Leaves
How PDFlibPas reads PDF name trees and number trees safely in Delphi: cyclic /Kids, untrusted /Limits, 4096-level trees and leaves with over 32,768 entries
Native EN 16931 Invoice Validation in Delphi Without Java
PDFlibPas checks EN 16931, XRechnung and Peppol BIS rules in native Pascal without Java, with official rule IDs, a coverage map and CII vs UBL tolerances
Why a No-Op PDF Save Can Corrupt Info and XMP Metadata
Why a no-op PDF save can rewrite a shared CreationDate or replace an XMP packet, how PDF Library for Delphi avoids both, and how to verify the result
PDF Object Streams and Cross-Reference Streams in Delphi
How losLab PDF Library writes PDF 1.5 object streams and xref streams from Delphi: ObjStm layout, type-2 entries, W field widths and encryption rules
PDF Layers in Delphi: Optional Content Groups (OCG)
PDF layers drive maps, CAD drawings and multilingual variants. See how PDF Library for Delphi creates and reads Optional Content Groups and their configurations
Read PDF Bookmark and Annotation Actions in Delphi
Most Delphi PDF libraries write bookmark and annotation actions but cannot read them back; PDF Library for Delphi reads GoTo, URI, Launch and JavaScript actions
PAdES Digital Signatures in Delphi: Signing and Validation with PDF Library for Delphi
Produce PAdES B-B, B-T and B-LT signatures with PDF Library for Delphi: timestamp reservations, DSS assembly and ByteRange audits before trusting a file
PDF Page Labels in Delphi: Fixing /Kids Number Trees
PDF Library for Delphi adds page labels to PDFs whose /PageLabels number tree uses /Kids, flattening the root per ISO 32000-1 so new label ranges take effect
Page-Level Associated Files in PDF 2.0 with PDFlibPas
PDFlibPas binds embedded files to a single page through the AF array in ISO 32000-2 14.13, keeping the payload in the EmbeddedFiles name tree
Page Stitching and Watermark Templates in Delphi PDFs
Stitch PDF pages side by side or overlay them with vector fidelity using losLab PDF Library Form XObject capture and composable watermark templates in Delphi
Parallel PDF Page Rendering in Delphi: Thread Safety
Render PDF pages in parallel from Delphi with losLab PDF Library: why TPDFlib needs one instance per worker thread, CoInitialize for GDI+, and safe logging
PDF Block Templates in Delphi: Text, Image and PDF Fills
PDFlibPas block templates hold named text, image and PDF placeholders for certificates and tickets; filling from the highest index down keeps every slot intact
Reduce PDF File Size in Delphi: Fonts, Images, LZW
Cut PDF file size in Delphi with losLab PDF Library: subset embedded fonts, downsample oversized images, and convert legacy LZW streams to Flate in one pass
PDF Number Grammar vs JSON: NaN, Infinity and null in Delphi
PDF Library for Delphi rewrites PDF number tokens such as -.25 and 007.5 into valid RFC 8259 JSON, writes null for NaN and Infinity, and is locale independent
PDF to Markdown and DOCX in Delphi with PDF Library for Delphi
PDF pages store glyphs, not paragraphs. PDF Library for Delphi exports Markdown or DOCX without Office, inferring headings, lists and tables from tags and fonts
PDF Version Preflight in Delphi: Measure RL vs GEO Rules
How the PDFlibPas save-time version preflight tells rectilinear Measure dictionaries from geospatial ones, what error 602 reports, and why const rules help
PDF/A and PDF/UA Preflight in Delphi with PDF Library for Delphi
Run PDF/A and PDF/UA preflight from Delphi with PDF Library for Delphi: structured findings, diffable reports, save-time fixups and veraPDF cross-checks
PDF/A-3 Extension Schemas for Factur-X XMP in Delphi
A Factur-X invoice fails veraPDF if its XMP properties are undeclared. See how PDF Library for Delphi adds the PDF/A-3 extension schema for fx metadata
PDF/E-1 Engineering Documents in Delphi with PDFlibPas
PDF/E-1 has its own XMP namespace, demands full lifecycle metadata and forbids the BX compatibility escape, so PDFlibPas preflights content within bounds
PDF/UA Font Audit in Delphi: Widths, CharSet, CIDSet
How PDFlibPas audits PDF/UA font layers in Delphi: glyph widths resolved via cmap and CIDToGIDMap, conservative CharSet and CIDSet rules, content stream scans
PDF/UA-2 Validation in Delphi: Not Just UA-1 Part 2
How PDFlibPas validates PDF/UA-2 files in Delphi with PDF 2.0 namespaces and RoleMapNS, fail-closed traversal limits, and an honest coverage report
PDF/VCR-1 Template Placeholders in Delphi with PDFlibPas
PDFlibPas builds PDF/VCR-1 replacement templates as a StructTreeRoot branch, so the save gate and manifest walk every top level branch, not just the first
PDF/X-1a, X-3 and X-4 Output in Delphi with PDFlibPas
PDFlibPas writes PDF/X-1a, X-3 and X-4 print files via SetPDFXMode. The article compares color, transparency and version rules, output intents and preflight
Shrink PDFs by Merging Near-Identical Images in Delphi
PDF Library for Delphi merges visually identical PDF images that differ only in encoding, using perceptual hashing with three error thresholds and a dry run
PNG Predictor Row Filter Tags in Delphi PDF Xref Streams
Why PDF Predictor values 10 to 14 still carry a PNG filter byte per row, how losLab PDF Library decodes them for Flate and LZW, and how to test the row loop
Preserving Parsed PDF Decimal Precision on Save in Delphi
PDFlibPas keeps the decimal text it parsed and writes it back unchanged, so a no-op save in Delphi keeps CalRGB Gamma values exact and page colors in place
PDF Library for Delphi Print Preview and Device-Context Output in Delphi
Delphi print preview that matches the printed page: device-context rendering, virtual printers, scaling, and DevMode persistence with PDF Library for Delphi
PDF Library for Delphi Performance Profiling: Hash Indexes in Delphi
Profile PDF Library for Delphi PDF rendering: swap linear dictionary scans for hash indexes, per-pixel gamma math for a LUT and O(n²) string joins for builders
Progressive PDF Range Loading in Delphi with PDFlibPas
How PDFlibPas opens multi-gigabyte PDFs from HTTP range servers and object storage: read callbacks, chunk-aligned caching, request coalescing and prefetch
Atomic PDF Repair Output in Delphi: Rename and DACL Safety
How PDF Library for Delphi publishes a repaired QDF file atomically: exclusive temp file, flush, same-volume rename, copied DACL, and the failures it refuses
Open Encrypted PDFs With a Raw File Key in Delphi
PDF Library for Delphi opens AES-128 and AES-256 PDFs straight from a hex file encryption key, verifies it against /U or /Perms, and keeps the handle read-only
Rebuild Damaged PDF Xref Tables: Delphi Recovery Scan
How the PDF Library for Delphi Delphi PDF Library rebuilds a damaged xref table with a single pass token scanner that ignores strings, comments and stream bytes
Converting a PDF to One Color Space in Delphi
RecolorDocument moves a PDF into gray, RGB or CMYK without redrawing it, converting color operators, images, indexed palettes and gradient stops together
Replace PDF Pages in Delphi Without Breaking Bookmarks
Replace PDF pages in place with PDF Library for Delphi so bookmarks, links and form widgets survive by keeping the page object and moving only the visual keys
SASLprep AES-256 PDF Passwords in Delphi with PDF Library for Delphi
Non-ASCII AES-256 PDF passwords fail in other readers without SASLprep. How PDF Library for Delphi prepares passwords per ISO 32000-2 and RFC 4013 in Delphi
Self-Signed Test Certificates in Delphi with CryptoAPI
PDF Library for Delphi creates self-signed RSA test certificates via CryptoAPI, where CryptGenKey takes the key length from the upper 16 bits of its flags
SHAKE256 XOF in Delphi: Keccak Domain Separation
PDFlibPas runs SHA-3 and SHAKE256 on one Keccak-f[1600] core, separated only by the pad10*1 domain byte and the rate rule, plus a streaming XOF for Delphi
Diagnosing Silent Stub Failures in a Pascal PDF Library
Three shapes of empty substitute implementation, why the one that reports success is the hardest to find, and how to diagnose it by inspecting output bytes
SM2, SM3 and SM4 PDF Signing and Encryption in Delphi
PDFlibPas signs PDFs with SM2 and SM3 and encrypts them with an SM4 crypt filter in pure Object Pascal: API calls, OIDs, interop notes and big-integer traps
Soft Masks and Transparency Flattening in Delphi
PDF Library for Delphi authors alpha and luminosity soft masks, sets image Matte entries, and flattens transparency to a printable PDF 1.3 file
Building Tagged PDF Structure Trees in Delphi with PDF Library for Delphi
Generate tagged PDFs from Delphi with PDF Library for Delphi: structure trees while drawing, table header semantics, artifacts and PDF/UA diagnostics on save
Map PDF Text to Content-Stream Bytes in Delphi
PDF Library for Delphi maps every extracted character back to its content stream instruction and source bytes, so Delphi code can edit one glyph in place
PDF Text Clipping: Why the Clip Is Applied at ET
PDF text clipping can make a gradient or image disappear when glyph paths are combined incorrectly. Follow BT, ET and rendering modes with PDFlibPas in Delphi
Text, Image, and Font Extraction from PDF in Delphi with PDF Library for Delphi
Extract positioned text, original image streams and font metadata from PDFs with PDF Library for Delphi, plus extraction options for search and audit jobs
Delphi PDF Text Search with Hit Coordinates: PDF Library for Delphi
Search PDF text by page range with PDF Library for Delphi: each hit returns its page and bounding rectangle, and every text block and image is enumerable
TIFF 12-Bit, Lossless and Arithmetic JPEG to PDF in Delphi
PDFlibPas imports TIFF images with 12-bit, lossless, arithmetic and old-style JPEG in native Pascal and embeds them as 8- or 16-bit images any PDF reader opens
PDFlibPas Page Boxes: TrimBox, BleedBox and CropBox Defaults
When a PDF page has no TrimBox, the CropBox applies. See which boxes inherit from /Pages and how PDFlibPas resolves page boxes for Delphi imposition
True PDF Redaction in Delphi: Delete and Sanitize
Real PDF redaction in Delphi with losLab PDF Library: RedactRegion deletes content-stream bytes while SanitizeDocument strips metadata, scripts, and actions
Uncolored PDF Patterns: Where Does the Hatch Color Come From?
An uncolored PDF pattern can render with the wrong tint when its base color space is misread. Trace cs and scn and render the page with PDFlibPas in Delphi
Unicode-Safe PDF Text Search in Delphi: NFC and NFD
PDF Library for Delphi matches canonically equivalent text so an NFC query finds NFD content, and keeps every hit on whole grapheme cluster edges
Hardening a Pascal PDF Parser Against Malicious Files
A PDF parser is an attack surface. Review integer overflow, out-of-bounds writes and unbounded recursion in font and image decoders, plus the Delphi guards
Vector Graphics in PDF With Delphi: Paths and Gradients
A PDF is a full 2D vector canvas. See how PDF Library for Delphi draws paths, Bezier curves and axial gradients, with even-odd versus nonzero fill, in Delphi
Vertical Japanese and Chinese Text in PDF with Delphi
PDF Library for Delphi sets Japanese and Chinese text down the page with a Type0 font in vertical writing mode, using the vertical glyph forms the face supplies
PDF Viewer Disk Cache and Per-Monitor DPI in Delphi
Speed up a Delphi PDF viewer with a cross-session disk page cache and per-monitor DPI: FNV-1a fingerprints, LRU pruning and WM_DPICHANGED in losLab PDF Library
Visual PDF Diff in Delphi: Pixel Compare and Page Pairing
PDFlibPas compares rendered PDF pages in Delphi on visible pixels with color tolerance and ignore regions, then pairs pages across documents to flag inserts
Web Fonts in PDF: WOFF2 and Variable Axes in Delphi
PDF Library for Delphi imports WOFF2 web fonts and instantiates TrueType and CFF2 variable axes into static fonts that embed, subset and extract normally
XFA SOM Path Expressions in Delphi: Dynamic Form Data
Dynamic XFA forms repeat subforms per data row. PDF Library for Delphi addresses them with XFA 3.3 SOM paths: $data and $record roots, [*] and predicates
Why a PDF Zero-Width Line Still Shows Up
A PDF zero-width stroke is a device hairline, not one user-space unit. Diagnose thin lines and transforms when rendering PDF pages with PDFlibPas in Delphi