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List of changes in MuPDF 1.24
Removed deprecated functions:
pdf_check_signature
Error handling changes:
You must call pdf_report_error in the final fz_catch. Any
unreported errors will be automatically reported when a new
error is raised, or when closing the fitz context.
List of changes in MuPDF 1.23.0
New features:
New WASM library with same API as mutool run and Java, for both browser and Node environments.
Support CropBox, TrimBox, BleedBox, and ArtBox in PDF tools and viewers.
PhotoShop PSD image support.
mupdf-gl: Custom ICC display profile support.
mutool poster: Option to split in RTL direction.
Miscellaneous improvements and notable bug fixes:
EPUB: Fix table cell height calculations.
EPUB: Inherit table cell background color from table row.
EPUB: Support files with partial encryption (only read unencrypted parts).
EPUB: Support files with incorrect directory prefixes.
TIFF: Stability improvements.
MOBI: Stability improvements.
PDF: Support old style border dash patterns.
PDF: Support GoToR links to remote PDF documents.
PDF: Improve link parsing and creation.
ZIP: Improve unicode file name handling.
Fall back to unhinted fonts if hints are broken.
Recognize document types by sniffing contents (don't need to rely on mimetype or file extension).
New APIs:
More PDF document permission flags.
Tweaked exception error logging.
pdf_minimize_document to squeeze amount of memory used by an open document.
Incompatible API changes:
pdf_field_name renamed to pdf_load_field_name.
mutool run -- changed many methods to match Java and new WASM library.
New and improved documentation.
List of changes in MuPDF 1.22.0
New command line "mutool recolor" to change colorspace of PDF files.
New command line "mutool trim" to remove content outside mediabox.
New flag to "mutool draw": -KK to remove all non-textual content.
Support PDF page labels.
Layout HTML tables with variable column widths.
Added JPEG output format. JPEG should be used with care due to its
lossy nature (if in doubt, use PDF instead).
Added PDF filter factories.
Added PDF color filter.
Added "culler" to sanitize filter.
Added flags to control embedding fonts in output.
New device methods for structured tags.
Increased maximum allowed image size.
Add magic flag to temporarily hide annotations when editing them.
Support RD in Square and Circle annotations.
Support dashed borders in annotations.
Support cloudy borders in annotations.
Improved layers in PDF files.
Fix performance issue with large PDF files and outlines.
Updated multi-threading examples.
Moved WASM project into separate repository.
Added Java and "mutool run" bindings for many more functions.
List of changes in MuPDF 1.21.0
Added MOBI input format support.
Added Story API for creating PDF documents from formatted text.
Added API to create, edit, and delete links.
Support custom images for Stamp annotations.
Support interior color on Polygon annotations.
Support line endings on PolyLine annotations.
Improved SVG output.
C++/Python/C# binding:
Changes to naming of wrapper functions and classes.
Added limited support for callbacks into Python, using SWIG Directors.
List of changes in MuPDF 1.20.0
Experimental C# bindings.
Cross compilation should no longer need a host compiler.
Major additions to JNI bindings.
New API to edit outline
New API to resolve and create links
New API to toggle individual layers in PDF
Layer panel in mupdf-gl
Layer option in mutool draw
New API to add a Javascript console
Console panel in mupdf-gl
Text search API extended to be able to distinguish between separate search hits.
Command line tool improvements:
all: Negative page numbers to index from the last page
mutool draw: Add option to render document without text
mutool draw and convert: Support DPI option in text and HTML output
New hybrid HTML output format using "scripts/pdftohtml" script:
Graphics in a background image
Text on top
Improved WASM viewer demo
Support high DPI screens
Progressive loading
Update to zlib 1.2.12 for security fix.
Too many bug fixes to list.
List of changes in MuPDF 1.19.0
Removed support for Luratech JBIG2 and JPEG2000 decoders.
Added 'extract' library for more output options:
Added DOCX output format
Added ODT output format
Notable new features:
Journal for undo and redo
Snapshot for auto-save and restore (for backgrounding mobile apps)
Reflow document wrapper
Rollover appearance for annotations and widgets
Customize appearance of signed digital signatures
Progress and cancel callbacks to OCR functions
Create signature form fields
Minor new features:
Support CJK fonts in pdfwrite output
Support JBIG2 images in pdfwrite output
Support opacity for all markup annotation types
High-DPI aware UI in mupdf-gl
mutool extract -a option to embed SMasks as alpha channel
API changes:
Removed pdf_widget type alias (was always same as pdf_annot)
Updated annotation 'dirty' logic
Fix typo in function and type names: designated name -> distinguished name
More functions available to 'mutool run'
More functions available to Java library
New unicode scripts and fonts for EPUB:
Dogra, Elymaic, Gondi, Hanifi Rohingya, Masaram Gondi,
Medefaidrin, Nushu, Nyiakeng Puachue Hmong, Old Sogdian,
Sogdian, Soyombo, Wancho, Yezidi, and Zanabazar Square.
C++ and Python bindings:
C++ and Python bindings now work on Windows.
Python bindings are available as pre-built binaries on pypi.org.
Added demo PDF viewer using the Python MuPDF bindings and PyQt.
Better access to data in generated wrapper classes.
Improved handling of out-parameters in generated Python.
Text representation of POD types via C++ operator<< and Python str().
Fixed ref-counting bug in iterators.
Updates for new MuPDF functions.
List of changes in MuPDF 1.18.0
mutool draw: bbox output format.
mutool draw: structured text extraction in JSON format.
mutool run: StructuredText.walk()
mutool run: PDFPage.process() and PDFAnnotation.process()
mupdf-gl: Added IBM Common User Access shortcuts for copy & paste.
mupdf-gl: Improved redaction UI.
java: Example desktop Java viewer.
wasm: WebAssembly viewer that runs in a browser.
api: Dehyphenation option in structured text extraction, to improve
searching for words that are hyphenated across lines.
api: pdf_new_date, pdf_to_date, pdf_dict_put_date and pdf_dict_get_date.
api: Added choice of image redaction algorithms: none, full, partial.
api: Optional use of Tesseract to use OCR to extract text.
svg: Many small parsing fixes.
svg: Parse inline CSS style attributes.
svg: Text elements (simple text layout only).
html: Added HTML5 parser.
pdf: High security redaction -- save redacted PDF as flattened bitmap,
guaranteed to not leak any sensitive redacted information.
Experimental C++ bindings.
Experimental Python bindings.
List of changes in MuPDF 1.17.0
api: Improved accessors for markup/ink/polygon annotation data.
api: Chapter based API for faster EPUB loading.
api: Add more documentation to header files.
api: Improved digital signature signing and verification.
api: Validate changes in a signed PDF file.
build: Moved windows build to VS2019 solution.
pdf: Redaction now works on images and links as well as text.
pdf: Greek, Cyrillic, Chinese, Japanese, and Korean scripts in forms and annotations.
pdf: File attachment annotations.
pdf: Use CCITT Fax compression for 1-bit images when creating PDF files.
epub: More forgiving XHTML parsing.
epub: Accelerator files to cache chapter data for faster EPUB loading.
epub: Optimized memory use.
mutool run: Edit Markup, Ink, and Polygon annotation data.
mutool run: Fill out form fields.
viewer: Ask for confirmation before closing a PDF with unsaved changes.
viewer: Embed and extract file attachment annotations.
library: Miscellaneous bugfixes.
library: Fixes to store operation.
thirdparty: Updated Harfbuzz to 2.6.4.
thirdparty: Updated jbig2dec to 0.18.
thirdparty: Updated MuJS to 1.0.7.
thirdparty: Updated OpenJPEG to 2.3.1.
thirdparty: Updated cURL to 7.66.0 (windows only).
List of changes in MuPDF 1.16.1
mupdf-x11: Changed key bindings to match mupdf-gl.
mupdf-x11: Invert by luminance for dark mode.
android: Fix compilation error.
List of changes in MuPDF 1.16.0
api: Major overhaul of color management architecture.
api: Improved functions to verify/sign PDF documents.
api: Number tree accessor function pdf_lookup_number.
api: Parse and handle more options for PWG output.
api: Removed obsolete gproof document type.
api: User callbacks for warning and error messages.
epub: Changed default page size to A5.
epub: Draw embedded SVG documents in EPUB/XHTML.
epub: New Noto fonts covering more unicode scripts.
epub: Support small-caps font-variant.
pdf: Add Redact annotation type and function to apply redactions.
pdf: Add/remove/change encryption and password when saving PDF files.
pdf: Improvements to text handling in PDF filter processor.
pdf: MP and DP operators now call begin/end_layer device methods.
pdf: New and improved progressive loading.
svg: Draw external images in SVG documents.
mutool show: Add 'form' selector to list PDF form fields.
mutool sign: Sign PDF documents from the command line.
mutool sign: Verify signatures in PDF documents from the command line.
viewer: Option to save a script of user actions for replay with mutool run.
viewer: Runtime toggle for ICC and spot rendering.
viewer: Tooltip when hovering over a link in mupdf-gl.
List of changes in MuPDF 1.15.0
General improvements:
* WebAssembly build target and examples.
* Improved forms API in both C and Java bindings.
* Improved forms JavaScript support.
* Create appearance streams for more form field types.
* Fixed many bugs in ICC color management.
* Fixed many memory leaks in error cleanup.
* Fixed bugs in pdfwrite output.
* Improved text extraction from LaTeX documents with math symbols.
* Improved trace device formatting.
* Support CBZ and CBT files larger than 2Gb.
* Show table of contents for FB2 and XHTML documents.
* Show embedded raster images in SVG and XHTML documents.
* Show FB2 cover page.
* Add option to save PDF files without encryption.
* Add inhibit-spaces option to stext device to turn off missing space detection.
* Simplified fz_try/fz_always/fz_catch macros.
mupdf-gl improvements:
* Automatically open annotation editor when selecting an annotation.
* Full page color tinting option in mupdf-gl.
* Show/hide table of contents sections.
* Trigger a reload with sighup.
* Toggle spot color mode with 'e'.
mutool improvements:
mutool show $PDF outline -- show outline with open/closed state indicator.
mutool show $PDF js -- show document level javascript.
mutool clean -A -- create appearance streams when missing.
mutool clean -AA -- recreate all appearance streams.
mutool run docs/examples/portfolio.js -- extract embedded files from PDF document.
mutool run docs/examples/pdf-dejpx.js -- decompress JPEG2000 images in PDF document.
mutool run docs/examples/fix-s22pdf.js -- fix fonts in documents generated by S22PDF.
Significant API changes:
* New and improved forms API.
* Renamed -DNO_ICC to -DFZ_ENABLE_ICC=0
* Removed fz_annot superclass. Use pdf_annot and pdf_widget directly instead.
* Annotations and Widgets now have separate enumerators.
* Added optional separations argument to pixmap rendering utility functions.
Various cleanups:
Per-function documentation comments moved to the source file.
Hopefully they will stay up to date more often than when they
were hidden away in the header file.
Removed unused internal testing tools: mjsgen and jstest.
Removed TGA output support. Use one of the more common and useful PAM,
PNM, PNG, or TIFF formats instead.
Removed support for PDF portfolios. This work-in-progress feature was
never completed, and only worked for a small subset of files.
Removed support for progressive loading. This rarely used feature added
a lot of complexity and was an unending source of bugs and strange
behaviour. Removing this feature has allowed us to clean up and
simplify large amounts of code, and fix dozens of bugs in one fell
swoop.
List of changes in MuPDF 1.14.0
* New features:
* Added "Source Han Serif" CJK fallback font.
* Added more scripts to the Noto fallback fonts.
* Multi-page PNM support.
* "mutool show" now supports a path syntax for selecting objects to show.
* Build system simplifications:
* Auto-generated CMap, ICC, and JS source files are checked in to git.
* Embedded CMap resources are now generated by a python script.
* Embedded font resources are linked directly if using GNU ld or windows.
* Namegen tool replaced by use of C macros.
* Simplified Makefile.
* Annotation editing:
* New annotation editing mode in mupdf-gl.
* Can create, edit, and delete most annotation types.
* Can create appearance streams for most annotation types.
* Can create appearance streams for Tx form fields.
* Can create appearance streams for Ch form fields.
* Form filling in mupdf-gl:
* Can click buttons, checkboxes, and radioboxes.
* Can fill out text fields using dialog box.
* Can select choice options using dialog box.
* Can verify and sign digital signatures.
* Improved UI for mupdf-gl:
* Password dialog.
* Error dialog.
* Open/save file dialog.
* Snap selection to words or lines by holding control or control+shift.
* Save and restore current location, bookmarks, and navigation history.
* Bug fixes:
* Improved CJK character fallback handling in EPUB.
* API changes:
* Pass rectangle and matrix structs by value.
* Replaced PDF_NAME_Xxx macros with PDF_NAME(Xxx).
* Added PDF_TRUE, PDF_FALSE, and PDF_NULL constant pdf_obj* macros.
* Added helper functions: pdf_dict_get_int, etc.
* Removed 'doc' argument in pdf_new_int, etc.
* Quads instead of rects when highlighting and searching text.
* mutool run: Pass arguments to script in scriptArgs global.
List of changes in MuPDF 1.13.0
* This is primarily a bugfix release.
* New "mutool sign" tool for showing and verifying digital signatures.
* Chinese, Japanese, Korean, Cyrillic, and Greek font support in mutool create.
* Improvements to annotation editing API.
List of changes in MuPDF 1.12.0
* New Android SDK:
New git repositories for the SDK projects:
* mupdf-android-fitz.git has the JNI bindings in a library.
* mupdf-android-viewer.git has the viewer as an activity in a library.
* mupdf-android-viewer-mini.git has the minimalist viewer as an activity in a library.
Binary packages in our Maven repository at http://maven.ghostscript.com:
* com.artifex.mupdf:fitz:1.12.+
* com.artifex.mupdf:viewer:1.12.+
* com.artifex.mupdf:mini:1.12.+
* Color management:
* LCMS2 library for color management.
* CMYK rendering with overprint simulation.
* Spot color rendering.
* Transparency rendering fixes.
* Structured text output improvements:
* Reworked structured text API.
* Faster text searching.
* Highlight and copy text by selecting lines instead of by area.
* New semantic XHTML output format.
* New layout preserving HTML output format.
* Features and improvements:
* Improved non-AA rendering with new scan converter.
* Improved LARGEFILE support.
* Improved TIFF support.
* Improved documentation.
* PCLm output.
* PSD output.
* New "mutool trace" tool.
* New "mutool sign" tool (work in progress).
* Text redaction (work in progress).
* Lots of bug fixes.
List of changes in MuPDF 1.11
* This is primarily a bug fix release.
* Split Android and iOS viewers into separate projects:
* mupdf-viewer-ios.git has the iOS viewer.
* mupdf-viewer-android-old.git has the Android viewer.
* mupdf-viewer-android-nui.git has a new advanced Android viewer.
* mupdf-viewer-android-mini.git has a new minimalist Android viewer.
* PDF portfolio support with command line tool "mutool portfolio".
* Add callbacks to load fallback fonts from the system.
* Use system fonts in Android to reduce install size.
* Flag to disable publisher styles in EPUB layout.
* Improved SVG output.
List of changes in MuPDF 1.10
* Headline changes:
* FictionBook (FB2) e-book support.
* Simple SVG parser (a small subset of SVG only).
* mutool convert: a new document conversion tool and interface.
* Multi-threaded rendering in mudraw.
* Luratech decoders for JBIG2 and JPEG2000 (commercial releases only).
* Optional JPEG-XR support (not included by default for security reasons).
* Updated base 14 fonts from URW.
* New CJK font with language specific variants.
* Hyperlink support in EPUB.
* Reduced memory use:
* New tool muraster: example printer driver with limited RAM usage and automatic banding.
* Alpha channel is now optional in pixmaps.
* More aggressive purging of cached objects.
* Partial image decoding for lower memory use when banding.
* Reduced code size when building with a subset of features:
* Reduced default set of built-in CMap tables to the minimum required.
* FZ_ENABLE_PDF, _XPS, _JS, to disable features at compile time.
* Function level linking.
* Interface changes and cleanups:
* Dropped pdf object generation numbers from public interfaces.
* Simplified PDF page, xobject, and annotation internals.
* Closing and freeing devices and writers are now separate steps.
* Improved PDF annotation editing interface (still a work in progress).
* Document writer interface.
* Banded image writer interface.
* Mobile viewers:
* New JNI interfaces to match capabilities of 'mutool run' javascript.
* New android and desktop java examples using new JNI interface.
List of changes in MuPDF 1.9
* Headline changes:
* New command line tools: create and run.
* New low-level Java interface for desktop and android.
* Bidirectional layout for Arabic and Hebrew scripts.
* Shaping complex scripts for EPUB text layout.
* Noto fallback fonts for EPUB layout.
* mutool create
Create new PDF files from scratch.
Read an annotated content stream in a text file and write a PDF file,
automatically embedding font and image resources.
* mutool run
Run javascript scripts with MuPDF bindings.
The interface is similar to the new Java interface.
* mutool draw
Optional multi-threaded operation (Windows and pthreads).
Optional low memory mode (primarily for testing).
List of changes in MuPDF 1.8
* Headline changes:
* New OpenGL-based barebones desktop viewer.
* New URW fonts with greek and cyrillic.
* 64-bit file support.
* Ghostscript proofing mode (source only; not in shipped binaries).
* EPUB improvements:
* User style sheets.
* GIF images (also for CBZ).
* Table of contents.
* CJK text.
* Page margins.
* Many bug fixes.
* Bug fixes:
* Updated FreeType to version 2.6.1.
* Various font substitution bug fixes.
* Fix setjmp/longjmp behaviour which could cause optimizing compilers to misbehave.
List of changes in MuPDF 1.7a
* Bugfixes
* Fixed bug that allocated too much memory when packing paths.
* Fixed EPUB font scaling bug.
* Fixed EPUB file type handling in viewers.
* Improved tolerance for broken and unsupported CSS.
* Features
* Added mudraw -z option to compress output streams.
List of changes in MuPDF 1.7
* Headline changes:
* New 'Indie dev' licensing options - contact [email protected] for more details.
* New HTML layout engine, and (DRM-free) EPUB viewer.
* Reduced memory usage - displaylists and internal PDF representation take much less memory, reducing total memory use on some files by over 60%.
* Important API changes:
* Bound contexts have been removed; we now pass fz_contexts explicitly.
* Reference counting of paths and text structures.
* Features:
* Add mutool pages option.
* Tweaked rendering to prevent feature dropout in common cases.
* Viewer tweaks
* Better mouse wheel handling
* Shift-space support
* Mouse button control of presentation mode
* Internal changes:
* Removal of bound contexts; fz_contexts now passed explicitly everywhere.
* PDF filter revamp - simpler interface.
* Devices use derived structures rather than user pointer.
* Sparse PDF xrefs held in more compact form.
* New gsview viewer split out to its own repository.
* Bug fixes
* Improved handling of broken files.
* Fix BBoxes of Type 3 fonts.
* Updated fonts (including greek and cyrillic).
* Various memory leaks and crashes.
* And many more.
List of changes in MuPDF 1.6
* Features:
* Color detection device (mudraw -T).
* Sepia mode full-page color tinting in X11 and win32 viewer (keybinding: shift-C).
* Re-implement printf and strtod due to portability issue with locales and number formatting.
* Add 'gsview' project: a Windows Modern UI viewer.
* Improve XML parser interface.
* Bug fixes:
* CBZ page ordering
* ZIP64 support
* iOS and Android bug fixes
* Miscellaneous minor fixes
List of changes in MuPDF 1.5
* Bug fixes.
List of changes in MuPDF 1.4
* Headline changes:
* CMYK rendering (mudraw PWG and PAM formats)
* TIFF viewer (with multi-page support).
* Added MuJS Javascript interpreter.
* MuJS is the default, V8 and JavaScriptCore are compile time options.
* Javascript support has to be explicitly enabled with pdf_enable_js.
* All viewers now have JavaScript enabled in the default builds.
* Viewers:
* X11: Horizontal scroll wheel support.
* X11: Status bar display with warnings.
* Android: Digital signatures.
* iOS: Links, form filling, annotation editing, and javascript.
* iOS: Reflow mode.
* WinRT: Printing.
* WinRT: Improved zooming behaviour.
* Tools:
* mudraw: Banded rendering with -B /band-height/.
* mudraw: Select output format with -F /format/.
* mudraw: Write to stdout if you use '-' as the output file name.
* mudraw: Add TGA output format.
* mudraw: Improved SVG output.
* mutool show: Write output to file instead of stdout with -o /filename/.
* mutool clean: Clean content streams with -s option.
* Annotations:
* Improved font handling.
* Form fields.
* Free text.
* Sticky notes.
* Optimizations:
* glyph cache: Partial eviction.
* glyph cache: Run-length compressed glyphs.
* Smarter handling of subpixel metrics in text rendering.
* Optimized blitting functions.
* Optimized gradient mesh drawing.
* API changes and additions:
* fz_stream API reworked: replace "read" function with "next".
* "Rebind" functions to associate context bound objects with another context:
fz_output, fz_stream, fz_device and fz_document.
* Introduce "document handlers" to detect and open different file types.
* Must now call fz_register_document_handlers() to register the defaults.
* May register your own handlers as well to work with fz_open_document.
* Hook to load system fonts: fz_install_load_system_font_funcs.
* PDF xref cache flushing functions (mark/clear/clear-to-mark).
* Add our own "printf" set of functions to format strings and write to fz_output:
* Format %f as short as possible while preserving precision.
* Has %C for formatting a unicode character as UTF-8.
* Has %M to format fz_matrix.
* Has %R to format fz_rect.
* Has %q and %( to format strings with escaped characters.
* PDF process interface: allow PDF interpreter to do more than just draw!
* Content stream state cleaning filter.
* Content stream rewriting filter.
* PDF digital signatures.
* Stroke states may now be stored on the stack.
* Improved fz_path internals.
* Gradient mesh drawing interface has been improved.
* Save files with incremental updates.
List of changes in MuPDF 1.3
* Windows RT viewer app for MuPDF.
* Library changes to support progressive loading (display PDF files as
they download). Windows/Linux/MacOS viewer supports this using curl.
* Incremental updates to PDF files are now (optionally) preserved on
loading/saving.
* Prototype support for checking PDF Digital Signatures.
* Initial annotation support (strike-out, underline, highlight and ink)
(library and android builds only).
* Fix operation on Android API level 8.
* Android redraw optimisations.
* Android app now supports Google Cloud Print.
* Android app translated into many languages.
* Android support for more architectures.
* Improvements to store (avoid collisions causing unnecessary evictions).
* Windows apps use Unicode filenames now.
* PDF function handling improved; functions can now be passed to devices
without 'sampling'.
* PDF image handling improved; images can now be passed to devices
without decompression.
* Indexed images are no longer uncompressed at load time, saving memory.
* Caching of rendered tiles for speed.
* Improved text analysis mode, capable of spotting columns/indents,
right-to-left text etc.
* HTML output mode now includes image output.
* PDF password encoding handling improved.
* MuPDF now opens Jpeg, Tiff and PNG files directly.
* Bug preventing OpenXPS files from being opened fixed.
* Initial (feature incomplete) SVG and PDF output devices.
* PWG raster (mono/grey/RGB) and PCL (mono) output devices.
* Various performance improvements (including tilings and mesh based
shadings).
* Revamped directory structure to reflect recent changes.
* Various potential SEGV, SoftMask and rendering fixes.
* Many potential crashes in Jpeg2000 and JBIG2 images fixed.
List of changes in MuPDF 1.2
* Important API changes:
* fz_bbox is now fz_irect.
* APIs (including fz_device) now pass fz_rect/fz_matrix by reference.
* fz_device API is now more consistent with regards to use of
fz_rect rather than fz_bbox.
* Add support for Javascript and forms handling.
* Fix many SEGVs with out of spec files. Many thanks to Mateusz "j00ru"
Jurczyk and Gynvael Coldwind of the Google Security team, zeniko,
Sebastian Rasmussen and all other contributors.
* Add fz_open_document_with_stream to allow non-file based operation.
* Move to using git submodules for third party libraries.
* Much enhanced Android application. Now on Google Play!
* Oversized and stroke text clipping implemented.
* Change shadings to decompose at render times; massive memory savings.
* Renamed 'mubusy' to 'mutool'.
* PDF 1.7 Extension Level 8 encryption implemented.
* Added consts to various parts of the API to help C++ interworking.
* Prototype transition support.
* Text searching API moved to fitz.
* Highlight and copy text selections.
* Performance enhancements for color conversion and fax decompression.
* ARM optimisations for color conversion and bitmap scaling.
* Bitmap subsampling stage introduced, with ARM optimisations.
* Type 3 fonts; glyphs are now handled as display lists.
* Scan converter performance improvements.
* Various rendering fixes.
List of changes in MuPDF 1.1
* Rendering bugs fixed (text clipping, stroked text etc).
* Better handling of 'large' (uncachable) glyphs.
* Added a delete button to the library view on the iOS port.
* Minor speed optimisations.
* Shading bug fixes.
* Move to using dynamically allocated parsing buffers (more resilient).
* Support for UserUnits.
* Fix bugs with image predictors (including with 16 bit images).
* More resilient to out of spec files.
* Extract pdf writing capability into the library from pdfclean, and
expand on it to allow for linearisation. Bug fixes in the garbage
collection of unused objects.
* Improve pdf writing recognition of images.
* Improved font matching.
* Start to move away from macros to inline functions (helpful for
applications requiring certification).
* Many bugs fixed.