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Diffstat (limited to 'canvas/README')
| -rw-r--r-- | canvas/README | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/canvas/README b/canvas/README index 0110f5adfd55..2fb141c48148 100644 --- a/canvas/README +++ b/canvas/README @@ -24,3 +24,23 @@ presentation framework with a fully independent UNO component, and it is based on the canvas. Some features used there are only available from canvas, like double-buffering, and hardware-accelerated alpha-blending (currently not on all platforms). + +== Cairo canvas == + +cairo canvas is one of backends of canvas component. canvas is mostly +used for slideshow rendering and also for emf+ rendering. we hoped it +will even be used by drawing layer, but it didn't happen (yet?) for +API look at offapi/com/sun/star/rendering/, the implementation is in +canvas and cppcanvas modules. + +cairo canvas backend uses cairo library for rendering. main advantage +is support of alpha transparency and in some cases accelerated +rendering. + +the backend itself is quite old and stable, not many changes in that +area lately, mostly changes for emf+ rendering, communication with +vcl and bugfixes + +FUTURE work: look at cairo canvas and situation when it is used +(mostly slideshow). TODO there still might be more cases when we +can save some roundtrips when exchanging data with vcl. |