Xpdf Changelog

What's new in Xpdf 3.04

• New text extractor.
• Added the pdftohtml tool.
• Added the pdftopng tool.
• New trapezoid-based rasterizer core (for performance).
• Generate appearance streams for Line, PolyLine, and Polygon annotations.
• Added the closeWindowOrQuit command, and changed the default binding for ctrl-W from closeWindow to closeWindowOrQuit.
• Implemented the new AES-256 mode (R=6, Acrobat X).
• Add an object cache.
• Added a small cache for object streams.
• Modify PSOutputDev to use LZW compression instead of RLE, with a fallback to RLE if the "psLZW no" setting is given.
• Pdfinfo now prints page rotation info.
• Modified ImageOutputDev, used by pdfimages, to output the masks and soft masks used when drawing images.
• Remove non-printable characters from error output, just in case they might cause problems for the terminal program.
• Added initial support for Code3of9 bar codes in XFA forms.
• Added the mapExtTrueTypeFontsViaUnicode xpdfrc command.
• Apply stroke adjustment to rectangular images and clipping regions (in addition to strokes and fills).
• Decode JPEG 2000 images at less than full resolution if the full res image isn't needed (i.e., if the raw image is higher resolution than the output).
• Implemented knockout groups.
• Removed t1lib support.
• Added support for images with 16-bit components.
• Rewrote the Dict class to use a hash table; as a side effect, this handles dictionaries with multiple definitions for a key, which are in violation of the spec, but Acrobat appears to handle.
• The transformed line width computation -- used to implement the minLineWidth setting, and the hairline threshold in monochrome mode -- was incorrect.
• Pdftops was not correctly handling the case where it couldn't find a 16-bit font -- this led to crashes and/or invalid PostScript.
• A bug in FlateStream::getBlock() was causing problems with narrow images.
• Use the correct _WIN32 define instead of WIN32.
• Use copy-on-write for the clip path in SplashState (when doing gsave), for performance.
• Added a Solaris-specific entry to the ghostscript font search path.
• SplashState was initializing line width to 0 instead of 1.
• Abort processing on a content stream after getting 500 errors (undefined operator, wrong number of args) -- this avoids very long processing time for malicious PDF files using bogus RLE encoded content streams.
• Added the psUseCropBoxAsPage xpdfrc option; "pdftops -pagecrop" now sets psUseCropBoxAsPage; "pdftops -pagecrop -paper match" now uses the CropBox as the page size.
• Re-architected the AcroForm support code into a separate AcroForm module.
• Fixed the handling of overprinting/transparency interaction, using the CompatibleOverprint blend mode.
• The TIFF predictor code for the 1-bit-per-pixel case was broken.
• For triangle and patch mesh shadings (types 4-7) with color functions, interpolate the function parameter not the color.
• Check the fontFile/fontDir commands before (instead of after) doing Base-14 substitution in PS output.
• Correctly handle non-embedded TrueType fonts that have an Identity ToUnicode mapping (display and PS output were failing).
• Added support for XFA form rendering, including an "enableXFA" xpdfrc setting.
• Handle PFB Type 1 fonts when generating PostScript output.
• Unwind any extraneous saved graphics state at the end of the page (before drawing annotations).
• Added some integer overflow checks in the GString class.
• Handle 16-bit components in JPEG 2000 images.
• ActualText spans can end without a valid font, in which case TextPage::beginWord was crashing.
• The Domain entry in function shadings wasn't being parsed correctly.
• Fixed a bug in the JPEG decoder - successive approximation (progressive mode) coefficients weren't being handled correctly.
• Added a better infinite loop test to the xref parser.
• When generating PostScript, merge reused TrueType fonts (if their code-to-GID mappings are the same).
• Tweak the Gouraud triangle shaded fill code to end the recursive splitting if the triangles get sufficiently small.
• Do bilinear interpolation when upsampling images.
• When skipping extraneous image data from an inline image, look for EI instead of just EI.
• When writing to stdout on Windows, pdftoppm now sets the file mode to binary. [Thanks to Robert Frunzke.]
• Accept strings as well as names for the BaseFont entry in font objects.
• Removed the TEXTOUT_WORD_LIST config option (with the new text extractor, this is always enabled).
• Fixed a bug in the JBIG2 decoder (the TPGD context for template #3 in readGenericBitmap was incorrect).
• Rewrote the PostScriptFunction code for performance.
• Handle 8-bit OpenType CFF fonts that are missing required tables in the OpenType wrapper.
• Handle tiling patterns with reversed coordinates in their bounding boxes.
• Added support for 64-bit file offsets, i.e., PDF files larger than 2GB.
• Optimize the code that rasterizes pattern-filled image masks.
• Added support for Mac OS X system fonts (Base-14 only).
• The backdrop color in luminosity-type soft mask groups was not being handled correctly.
• Modified behavior of "pdftops -paper match -duplex ..." - it will now duplex consecutive same-sized pages.
• Tweak the handling of degenerate fills ('moveto lineto fill') to match Adobe.
• Don't honor the OPM=1 setting with ICCBased CMYK color spaces.
• Whole-word searches were treating certain punctuation (Unicode number separators and terminators) as part of the word, e.g., searching for "foo" would not match "foo,".
• Use the TextString class everywhere it makes sense.
• Removed the unnecessary segment sort in Splash (performance optimization).
• Handle hyperlinks that use Widget-type annotations.
• Fix up the integer overflow checks to avoid issues with clever compilers. [Thanks to Nickolai Zeldovich.]
• Correctly handle streams with missing Length entries in damaged PDF files.
• Added a compile-time option (LOAD_FONTS_FROM_MEM) to load fonts from memory rather than temporary files on disk.
• Added the psRasterSliceSize xpdfrc option.
• Fixed a case in the JPEG 2000 arithmetic decoder where extra data is present in packet i, and needs to be saved for use in packet i+1.
• Fixed a bug in the JPEG 2000 decoder related to images with fewer than 8 bits per component.
• Handle the case in PSOutputDev where slice size overflows a 32-bit integer.
• Add (partial) support for TrueType cmap format 2.
• Always pass FT_LOAD_NO_BITMAP to FreeType -- bitmaps apparently fail with rotated characters.
• Support fonts specified in ExtGState dictionaries.
• Annotations with empty Border arrays should not draw a border.
• Fix the CMap parser to handle large CID ranges.
• Check for Type 3 CharProcs that call q or Q before the d0/d1 operator, and treat them as uncacheable.
• Invert the selection color when starting in reverse video mode.
• Device{Gray,RGB,CMYK} cannot be mapped via a resource dict.
• Changed the PS output for masked images (explicit and color key masking): use a plain old clip path instead of rectclip to avoid array overflows.
• Check the StemSnapH/V arrays when converting Type 1C fonts to Type 1 - if there are any duplicate or out-of-order values, skip that StemSnapH/V array.
• Added the psMinLineWidth xpdfrc setting.
• Fix an obscure issue in converting TrueType fonts to Type 42, related to empty glyph descriptions (12 zero bytes).
• Pdftops now reports an error if there were any I/O errors writing to the PS output file.
• Fix vertical text (CJK fonts) in PS output -- offset the character origin correctly.
• Increased the number of digits used by pdfimages for the image number from three to four.
• Handle right-to-left (e.g., Arabic) ligatures correctly in the text extractor.
• Added the -loc and -locPS options to pdffonts.
• Extend the object parser recursion limit to cover Stream::addFilters() / Stream::makeFilters() - to avoid another possibility of stack overflow.
• Disable FreeType autohinting, because it can fail badly with font subsets that use invalid glyph names -- except in the case of Type 1 fonts, which look much better with light autohinting.
• Modified the rasterizer pipeline functions to process a scan line at a time (for performance).
• Removed VMS build support (it hasn't been updated in ages).
• Removed pdftotext's '-htmlmeta' option (use pdftohtml instead).
• PSOutputDev's font/form setup code, and pdffonts, were not scanning soft mask groups in ExtGState dictionaries.
• Invalid DCT input (e.g., from a damaged PDF file) could overflow the dctClip array.
• When upsampling an image mask or image with a large resulting image size, do it in stream mode instead of prescaling the whole image (to avoid running out of memory).
• Added infinite loop detection to pdffonts.