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cairo/NEWS
Carl Worth 9068937026 Increment CAIRO_VERSION to 0.3.0 
Add notes for snapshot 0.3.0
2005-01-21 12:48:11 +00:00

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Snapshot 0.3.0 (2005-01-21 Carl Worth <cworth@cworth.org>)
==========================================================
Major API changes
-----------------
1) The public header files will no longer be directly installed into
the system include directory. They will now be installed in a
subdirectory named "cairo", (eg. in /usr/include/cairo rather than
in /usr/include).
As always, the easiest way for applications to discover the
location of the header file is to let pkg-config generate the
necessary -I CFLAGS and -L/-l LDFLAGS. For example:
cc `pkg-config --cflags --libs cairo` -o foo foo.c
IMPORTANT: Users with old versions of cairo installed will need to
manually remove cairo.h and cairo-features.h from the
system include directories in order to prevent the old
headers from being used in preference to the new ones.
2) The backend-specific portions of the old monolithic cairo.h have
been split out into individual public header files. The new files
are:
cairo-atsui.h
cairo-ft.h
cairo-glitz.h
cairo-pdf.h
cairo-png.h
cairo-ps.h
cairo-quartz.h
cairo-xcb.h
cairo-xlib.h
Applications will need to be modified to explicitly include the new
header files where appropriate.
3) There are two new graphics backends in this snapshot, a PDF
backend, and a Quartz backend. There is also one new font backend,
ATSUI.
PDF backend
-----------
Kristian Høgsberg has contributed a new backend to allow cairo-based
applications to generate PDF output. The interface for creating a PDF
surface is similar to that of the PS backend, as can be seen in
cairo-pdf.h:
void
cairo_set_target_pdf (cairo_t *cr,
FILE *file,
double width_inches,
double height_inches,
double x_pixels_per_inch,
double y_pixels_per_inch);
cairo_surface_t *
cairo_pdf_surface_create (FILE *file,
double width_inches,
double height_inches,
double x_pixels_per_inch,
double y_pixels_per_inch);
Once a PDF surface has been created, applications can draw to it as
any other cairo surface.
This code is still a bit rough around the edges, and does not yet
support clipping, surface patterns, or transparent gradients. Text
only works with TrueType fonts at this point and only black text is
supported. Also, the size of the generated PDF files is currently
quite big.
Kristian is still actively developing this backend, so watch this
space for future progress.
Quartz backend
--------------
Calum Robinson has contributed a new backend to allow cairo
applications to target native Mac OS X windows through the Quartz
API. Geoff Norton integrated this backend into the current
configure-based build system, while Calum also provided Xcode build
support in the separate "macosx" module available in CVS.
The new interface, available in cairo-quartz.h, is as follows:
void
cairo_set_target_quartz_context (cairo_t *cr,
CGContextRef context,
int width,
int height);
cairo_surface_t *
cairo_quartz_surface_create (CGContextRef context,
int width,
int height);
There is an example program available in CVS in cairo-demo/quartz. It
is a port of Keith Packard's fdclock program originally written for
the xlib backend. A screenshot of this program running on Mac OS X is
available here:
http://cairographics.org/~cworth/images/fdclock-quartz.png
ATSUI font backend
------------------
This new font backend complements the Quartz backend by allowing
applications to use native font selection on Mac OS X. The interface
is a single new function:
cairo_font_t *
cairo_atsui_font_create (ATSUStyle style);
Minor API changes
-----------------
Prototype for non-existent function "cairo_ft_font_destroy" removed.
Now depends on libpixman 0.1.2 or newer, (0.1.3 is being released
concurrently and has some useful performance improvements).
Default paint color is now opaque black, (was opaque white). Default
background color is transparent (as before).
Renamed "struct cairo" to "struct _cairo" to free up the word "cairo"
from the C++ identifier name space.
Functions returning multiple return values through provided pointers,
(cairo_matrix_get_affine, cairo_current_point, and
cairo_current_color_rgb), will now accept NULL for values the user
wants to ignore.
CAIRO_HAS_FREETYPE_FONT has now been renamed to CAIRO_HAS_FT_FONT.
Performance improvements
------------------------
Alexander Larsson provided some fantastic performance improvements
yielding a 10000% performance improvement in his application, (when
also including his performance work in libpixman-0.1.3). These include
* Fixed handling of cache misses.
* Creating intermediate clip surfaces at the minimal size required.
* Eliminating roundtrips when creating intermediate Xlib surfaces.
Implementation
--------------
Major re-work of font metrics system by Keith Packard. Font metrics
should now be much more reliable.
Glitz backend
-------------
Updated for glitz-0.3.0.
Bug fixes in reference counting.
Test suite
----------
New tests for cache crashing, rotating text, improper filling of
complex polygons, and leaky rasterization.
Bug fixes
---------
Fixed assertion failure when selecting the same font multiple times in
sequence.
Fixed reference counting so cache_destroy functions work.
Remove unintended copyright statement from files generated with
PostScript backend.
Fixed to eliminate new warnings from gcc 3.4 and gcc 4.
Snapshot 0.2.0 (2004-10-27 Carl Worth <cworth@cworth.org>)
===========================================================
New license: LGPL/MPL
---------------------
The most significant news with this release is that the license of
cairo has changed. It is now dual-licensed under the LGPL and the
MPL. For details see the COPYING file as well as COPYING-LGPL-2.1 and
COPYING-MPL-1.1.
I express my thanks to everyone involved in the license change process
for their patience and support!
New font and glyph internals
----------------------------
Graydon Hoare has put a tremendous amount of work into new internals
for handling fonts and glyphs, including caches where appropriate.
This work has no impact on the user-level API, but should result in
great performance improvements for applications using text.
New test suite
--------------
This snapshot of cairo includes a (small) test suite in
cairo/test. The tests can be run with "make check". The test suite was
designed to make it very easy to add new tests, and we hope to see
many contributions here. As you find bugs, please try adding a minimal
test case to the suite, and submit it with the bug report to the
cairo@cairographics.org mailing list. This will make it much easier
for us to track progress in fixing bugs.
New name for glitz backend
--------------------------
The gl backend has now been renamed to the glitz backend. This means
that the following names have changed:
CAIRO_HAS_GL_SURFACE -> CAIRO_HAS_GLITZ_SURFACE
cairo_set_target_gl -> cairo_set_target_glitz
cairo_gl_surface_create -> cairo_glitz_surface_create
This change obviously breaks backwards compatibility for applications
using the old gl backend.
Up-to-date with latest glitz snapshots
--------------------------------------
This snapshot of cairo is now up to date with the latest glitz
snapshot, (currently 0.2.3). We know that the latest cairo and glitz
snapshots have been incompatible for a very long time. We've finally
fixed that now and we're determined to not let that happen again.
Revert some tessellation regression bugs
----------------------------------------
People that have been seeing some tessellation bugs, (eg. leaked
fills), in the CVS version of cairo may have better luck with this
release. A change since the last snapshot was identified to trigger
some of these bugs and was reverted before making the snapshot. The
behavior should be the same as the previous (0.1.23) snapshot.
Miscellaneous changes
---------------------
Changed CAIRO_FILTER_DEFAULT to CAIRO_FILTER_BEST to make gradients
easier.
Track XCB API change regarding iterators.
Various bug fixes
-----------------
Fix calculation of required number of vertices for pen.
Fix to avoid zero-dimensioned pixmaps.
Fix broken sort of pen vertices.
Fix bug when cairo_show_text called with a NULL string.
Fix clipping bugs.
Fix bug in computing image length with XCB.
Fix infinite loop bug in cairo_arc.
Fix memory management interactions with libpixman.
Snapshot 0.1.23 (2004-05-11 Carl Worth <cworth@isi.edu>)
========================================================
Fixes for gcc 3.4
-----------------
Fix prototype mismatches so that cairo can be built by gcc 3.4.
Updates to track glitz
----------------------
Various fixes to support the latest glitz snapshot (0.1.2).
Gradient updates
----------------
Radial gradients now support both inner and outer circles.
Transformed linear gradients are now properly handled.
Fixes for extend type reflect.
Glitz updates
-------------
Converted shading routines to use fixed point values and introduced a
shading operator structure for more efficient shading calculations.
Support compositing with mask surface when mask is solid or
multi-texturing is available.
PNG backend cleanups
--------------------
Fix output to properly compensate for pre-multiplied alpha format in cairo.
Add support for A8 and A1 image formats.
Bug fixes
---------
Avoid crash or infinite loop on null strings and degeneratively short
splines.
New? bugs in cairo_clip
-----------------------
There are some fairly serious bugs in cairo_clip. It is sometimes
causing an incorrect result. And even when it does work, it is
sometimes so slow as to be unusable. Some of these bugs may not be
new, (indeed cairo_clip has only ever had a braindead-slow
implementation), but I think they're worth mentioning here.
Snapshot 0.1.22 (2004-04-16 Carl Worth <cworth@isi.edu>)
========================================================
Cairo was updated to track the changes in libpixman, and now depends
on libpixman version 0.1.1.
Snapshot 0.1.21 (2004-04-09 David Reveman <c99drn@cs.umu.se>)
=============================================================
New OpenGL backend
------------------
The OpenGL backend provides hardware accelerated output for
X11 and OS X. The significant new functions are:
cairo_set_target_gl
cairo_gl_surface_create
Automatic detection of available backends
-----------------------------------------
The configure script now automatically detect what backends are
available, (use ./configure --disable-`backend' to prevent
compilation of specific backends).
Snapshot 0.1.20 (2004-04-06 Carl Worth <cworth@isi.edu>)
========================================================
New pattern API
---------------
David Reveman has contributed a new pattern API which enable linear
and radial gradient patterns in addition to the original surface-based
patterns. The significant new top-level functions are:
cairo_pattern_create_linear
cairo_pattern_create_radial
cairo_pattern_create_for_surface
cairo_pattern_add_color_stop
cairo_set_pattern
Any code using the old cairo_set_pattern, (which accepted a
cairo_surface_t rather than a cairo_pattern_t), will need to be
updated.
Update to XCB backend
---------------------
The XCB backend is now enabled by default, (use ./configure
--disable-xcb to turn it off).
Faster clipping
---------------
Graydon Hoare has added optimizations that make cairo_clip much faster
when the path is a pixel-aligned, rectangular region.
Bug fixes.
Snapshot 0.1.19 (2004-02-24 Carl Worth <cworth@isi.edu>)
========================================================
New PNG backend
---------------
Olivier Andrieu contributed a new PNG backend. It builds on the
existing image backend to make it easy to render "directly" to a
.png file. The user never needs to deal with the actual image
buffer. The significant new functions are:
cairo_set_target_png
cairo_png_surface_create
The PNG backend is not enabled by default so that by default there is
not a new dependency on libpng. Use ./configure --enable-png to enable
this backend.
Snapshot 0.1.18 (2004-02-17 Carl Worth <cworth@isi.edu>)
========================================================
Path query functionality
------------------------
It's now possible to query the current path. The two new functions
are:
cairo_current_path
cairo_current_path_flat
Each function accepts a number of callback functions that will be
called for each element in the path (move_to, line_to, curve_to,
close_path). The cairo_current_path_flat function does not accept a
curve_to callback. Instead, all curved portions of the path will be
converted to line segments, (within the current tolerance value). This
can be handy for doing things like text-on-path without having to
manually interpolate bezier splines.
New XCB backend
---------------
Jamey Sharp has contributed a second X backend that uses the new, lean
XCB library rather than Xlib. It cannot currently be compiled at the
same time as the Xlib backend. See ./configure --enable-xcb.
Build fixes for cygwin.
Bug fixes.
Snapshot 0.1.17 (2003-12-16 Carl Worth <cworth@isi.edu>)
========================================================
Better text support
-------------------
This snapshot provides much better text support by implementing the
following four functions:
cairo_text_extents
cairo_glyph_extents
cairo_text_path
cairo_glyph_path
The text/glyph_extents functions can be used to determine the bounding
box (and advance) for text as if drawn by show_text/glyphs.
The text/glyph_path objects functions place text shapes on the current
path, where they can be subsequently manipulated. For example,
following these functions with cairo_stroke allows outline text to be
drawn. Calling cairo_clip allows clipping to a text-shaped region.
Combined dependencies
---------------------
The cairo core now depends only on the libpixman library. This single
library replaces the three previous libraries libic, libpixregion, and
slim. Thanks to Dave Beckett <dave.beckett@bristol.ac.uk> for all of
the heavy lifting with this renaming effort.
Conditional compilation of backends
-----------------------------------
Cairo now allows optional backends to be disabled at compile time. The
following options may now be passed to the configure script:
--disable-xlib
--disable-ps
Note that the first option is a change from the old --without-x option
which will no longer have any effect.
OS X supported - several byte-order issues resolved
---------------------------------------------------
Cairo has now been successfully compiled under OS X. Testing revealed
that there were some byte-order problems in the PostScript backend and
the PNG generation in the demos. These have now been resolved.
2003-10
=======
Graydon Hoare <graydon@redhat.com> implemented the first real text
support using Freetype/fontconfig, (previous versions of cairo used
Xft and could only draw text when using an X backend).
2003-09
=======
Graydon Hoare <graydon@redhat.com> added the first real support for
running cairo with a non-render-aware X server.
Jamey Sharp <jamey@minilop.net> virtualized the backend font and
surface interfaces in September, 2003.
2003-06
=======
Xr is renamed cairo to avoid confusion since it no longer had a strict
dependence on X.
2003-05
=======
A new image surface backend is added to Xr. Keith Packard
<keithp@keithp.com> wrote the image compositing code in libic that is
used for the image_surface backend. This code was originally written
as the software fallback for the render extension within the X
server.
2002-06
=======
Carl Worth <cworth@isi.edu> wrote the first lines of Xr, after Keith
Packard <keithp@keithp.com> proposed the plan for a stateful drawing
library in C providing a PostScript-like rendering model.
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