History

Noel Grandin c68c744b68 pass unique_lock as param in WeakComponentImplHelperBase::disposing so that subclasses can drop the lock while calling listeners Change-Id: I6105438110af08f10b0ed50057b28172c3442b95 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/127434 Tested-by: Jenkins Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>		2021-12-25 13:56:27 +01:00
..
inc	pass unique_lock as param in WeakComponentImplHelperBase::disposing	2021-12-25 13:56:27 +01:00
opengl
qa/cppunit
source	pass unique_lock as param in WeakComponentImplHelperBase::disposing	2021-12-25 13:56:27 +01:00
workben
CppunitTest_canvas_test.mk
Executable_canvasdemo.mk
IwyuFilter_canvas.yaml
Library_cairocanvas.mk	Generally determine Rdb content from gb_*_set_componentfile calls	2021-12-10 08:14:24 +01:00
Library_canvasfactory.mk	Generally determine Rdb content from gb_*_set_componentfile calls	2021-12-10 08:14:24 +01:00
Library_canvastools.mk
Library_directx9canvas.mk	Generally determine Rdb content from gb_*_set_componentfile calls	2021-12-10 08:14:24 +01:00
Library_gdipluscanvas.mk	Generally determine Rdb content from gb_*_set_componentfile calls	2021-12-10 08:14:24 +01:00
Library_oglcanvas.mk	Generally determine Rdb content from gb_*_set_componentfile calls	2021-12-10 08:14:24 +01:00
Library_simplecanvas.mk	Generally determine Rdb content from gb_*_set_componentfile calls	2021-12-10 08:14:24 +01:00
Library_vclcanvas.mk	Generally determine Rdb content from gb_*_set_componentfile calls	2021-12-10 08:14:24 +01:00
Makefile
Module_canvas.mk	Refactor some buildsytem stuff (mostly whitespace)	2021-12-13 16:48:47 +01:00
Package_opengl.mk
README.md
README.vars
StaticLibrary_directxcanvas.mk

README.md

UNO-based Graphics Backend

UNO-based graphics backend, lesser impedance to modern graphics APIs than vcl.

The canvas Framework

The canvas framework is the successor of the system GUI and graphics backend VCL. Basic functionality is available, supplying just as much features as necessary to provide a VCL-equivalent feature set (except proper BiDi/CTL support).

The canvas framework consists of the following two modules, canvas and cppcanvas. Additionally, a new generic graphics tooling is used (but not exclusively by the canvas, Armin's drawinglayer module also make use of it), which resides in basegfx.

The UNO API used by the canvas is primarily under css::rendering, with css::rendering::XCanvas being the central interface.

The slideshow Engine

The slideshow engine has replaced the former Impress-embedded 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 Works

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.