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NEWS: Add notes for 1.6.0 release
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Carl Worth
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NEWS
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NEWS
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Release 1.6.0 (2008-04-10 Carl Worth <cworth@cworth.org>)
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=========================================================
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The cairo community is quite pleased to announce the 1.6.0 release of
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the cairo graphics library. This is a major update to cairo, with new
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features and enhanced functionality which maintains compatibility for
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applications written using cairo 1.4, 1.2, or 1.0. We recommend that
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anybody using a previous version of cairo upgrade to cairo 1.6.0.
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The most significant new features in this release are dramatically
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improved PDF and PostScript[*] output, support for arbitrary X server
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visuals (including PseudoColor), a new Quartz backend, and and a new
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"win32 printing" backend. See below for more details on these and
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other new features.
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New dependency on external pixman library (Thanks, Søren!)
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----------------------------------------------------------
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As of cairo 1.6, cairo now depends on the pixman library, for which
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the latest release can be obtained alongside cairo:
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http://cairographics.org/releases/pixman-0.10.0.tar.gz
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This library provides all software rendering for cairo, (the
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implementation of the image backend as well as any image fallbacks
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required for other backends). This is the same code that was
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previously included as part of cairo itself, but is now an external
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library so that it can be shared by both cairo and by the X server,
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(which is where the code originated).
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Improved PDF, PostScript, and SVG output (Thanks, Adrian!)
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----------------------------------------------------------
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Users of the cairo-pdf, cairo-ps, and cairo-svg should see a dramatic
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improvement from cairo 1.2/1.4 to 1.6. With this release there are now
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almost no operations that will result in unnecessary rasterization in
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the PDF and PostScript. Rasterized "image fallbacks" are restricted
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only to minimal portions of the document where something is being
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drawn with cairo that is beyond the native capabilities of the
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document, (this is rare for PDF or SVG, but occurs when blending
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translucent objects for PostScript).
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This means that the final output will be of higher quality, and will
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also be much smaller, and therefore will print more quickly. The
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machinery for doing analysis and minimal fallbacks also benefits the
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win32-printing surface described below.
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In addition to doing less rasterization, the PostScript and PDF output
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also has several other improvements to make the output more efficient
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and more compatible with specifications.
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[*] Note: Just before this release, a bug has been reported that the
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PostScript output from cairo can crash some printers, (so far the
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following models have been reported as problematic Xerox Workcentre
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7228 or 7328 and Dell 5100cn). We will implement a workaround as soon
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as we can learn exactly what in cairo's output these printers object
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to, (and we could use help from users that have access to misbehaving
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printers). This bug is being tracked here:
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Printing some PDFs from evince is crashing our Xerox printer
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http://bugs.freedesktop.org/show_bug.cgi?id=15348
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New support for arbitrary X server visuals (Thanks, Keith and Behdad!)
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----------------------------------------------------------------------
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As of cairo 1.6, cairo should now work with an arbitrary TrueColor or
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8-bit PseudoColor X server visual. Previous versions of cairo did not
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support these X servers and refused to draw anything. We're pleased to
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announce that this limitation has been lifted and people stuck with
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ancient display systems need no longer be stuck with ancient software
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just because of cairo.
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New, supported Quartz backend for Mac OS X (Thanks, Brian and Vladimir!)
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------------------------------------------------------------------------
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As of cairo 1.6, the cairo-quartz backend is now marked as "supported"
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rather than "experimental" as in previous cairo releases. Its API now
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has guarantees of API stability into future cairo releases, and its
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output quality is comparable to other backends. There have been
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significant improvements to cairo-quartz since 1.4. It now uses many
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fewer image fallbacks, (meaning better performance), and has greatly
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improved text rendering.
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New, "win32 printing" backend (Thanks, Adrian and Vladimir!)
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------------------------------------------------------------
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A new win32-printing surface has been added with an interface very
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similar to the original win32 surface, (both accept an HDC
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parameter). But this new surface should only be called with a printing
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DC, and will result in all drawing commands being stored into a
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meta-surface and emitted after each page is complete. This allows
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cairo to analyze the contents, (as it does with PDF, PostScript, and
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SVG backends), and to do minimal image-based fallbacks as
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necessary. The analysis keeps things as efficient as possible, while
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the presence of fallbacks, (when necessary), ensure the consistent,
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high-quality output expected from cairo.
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Robustness fixes (Thanks, Chris!)
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---------------------------------
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There has been a tremendous number of improvements to cairo's
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robustness. Areas that have been improved include:
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* Proper reporting of errors
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* Responding correctly to invalid input
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* Avoiding integer overflows
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* Avoiding memory leaks on error-recovery paths
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* Making reference counting thread safe
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* Exhaustive testing of memory allocation points
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Other fixes (Thanks, everybody!)
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--------------------------------
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Cairo's internal fixed-point representation has been changed from
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16.16 to 24.8. This has a direct impact on applications as it allows
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much larger objects to be drawn before internal limits in cairo make
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the drawing not work.
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The CAIRO_EXTEND_PAD mode is now fully supported by surface
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patterns. This mode allows applications to use cairo_rectangle and
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cairo_fill to draw scaled images with high-quality bilinear filtering
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for the internal of the image, but without any objectionably blurry
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edges, (as would happen with the default EXTEND_NONE and cairo_paint).
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Rendering with CAIRO_ANTIALIAS_NONE has been fixed to be more
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predictable, (previously image rendering and geometry rendering would
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be slightly misaligned with respect to each other).
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The reference manual at http://cairographics.org/manual now documents
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100% of the functions and types in cairo's public API.
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API additions
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-------------
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Several small features have been added to cairo with new API functions:
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cairo_format_stride_for_width
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Must be called to compute a properly aligned stride value before
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calling cairo_image_surface_create_for_data.
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cairo_has_current_point
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Allows querying if there is a current point defined for the
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current path.
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cairo_path_extents
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Allows querying for path extents, (independent of any fill or
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stroke parameters).
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cairo_surface_copy_page
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cairo_surface_show_page
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Allow beginning a new document page without requiring a cairo_t
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object.
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cairo_ps_surface_restrict_to_level
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cairo_ps_get_levels
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cairo_ps_level_to_string
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cairo_ps_surface_set_eps
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Allow controlling the Post PostScript level, (2 or 3), to
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target, as well as to generate Encapsulated PostScript (EPS).
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cairo_quartz_font_face_create_for_cgfont
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Create a quartz-specific cairo_font_face_t from a CGFontRef.
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cairo_win32_font_face_create_for_logfontw_hfont
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Create a win32-specific cairo_font_face from a LOGFONTW and an
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HFONT together.
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Thanks, Everyone!
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-----------------
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I've accounted for 32 distinct people with attributed code added to
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cairo between 1.4.14 and 1.6.0, (their names are below). That's an
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impressive number, but there are certainly dozens more that
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contributed with testing, suggestions, clarifying questions, and
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encouragement. I'm grateful for the friendships that have developed as
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we have worked on cairo together. Thanks to everyone for making this
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all so much fun!
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Adrian Johnson, Alp Toker, Antoine Azar, Behdad Esfahbod,
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Benjamin Otte, Bernardo Innocenti, Bertram Felgenhauer,
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Boying Lu, Brian Ewins, Carl Worth, Chris Heath, Chris Wilson,
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Claudio Ciccani, Emmanuel Pacaud, Jeff Muizelaar, Jeremy Huddleston,
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Jim Meyering, Jinghua Luo, Jody Goldberg, Jonathan Gramain,
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Keith Packard, Ken Herron, Kouhei Sutou, Kristian Høgsberg,
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Larry Ewing, Martin Ejdestig, Nis Martensen, Peter Weilbacher,
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Richard Hult, Shailendra Jain, Søren Sandmann Pedersen,
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Vladimir Vukicevic
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Snapshot 1.5.20 (2008-04-04 Carl Worth <cworth@cworth.org>)
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===========================================================
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This is the tenth snapshot in cairo's unstable 1.5 series. It comes
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@ -155,7 +345,6 @@ lack of coverage in our test suite):
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CGFont backend returns 0 font extents
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https://bugs.freedesktop.org/show_bug.cgi?id=15319
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Snapshot 1.5.16 (2008-04-01 Carl Worth <cworth@cworth.org>)
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===========================================================
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This is the eighth snapshot in cairo's unstable 1.5 series. It comes
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@ -385,13 +574,6 @@ fixes the following bug:
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Cairo doesn't support 8-bit pseudocolor visuals
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https://bugs.freedesktop.org/show_bug.cgi?id=4945
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Unresolved issues (must be fixed before cairo 1.6)
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--------------------------------------------------
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XXX: Need to decide if cairo_image_surface_create_for_data should be
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documented and tested as supporting an image with a negative
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stride. Also need to decide the correct return value for
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cairo_format_stride_for_width in case of any error.
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Snapshot 1.5.12 (2008-02-28 Carl Worth <cworth@cworth.org>)
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===========================================================
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This is the sixth snapshot in cairo's unstable 1.5 series. It comes 1
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