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Luboš Luňák adc2ac31fb adjust gradient drawing in vclcanvas (tdf#144073) 
For whatever strange reason the drawing does not use the given
geometry, but something bigger. When I added direct drawing using
VCL in a46cb5dc60 I naively assumed
that the drawing area for the gradient would be the given area.

Change-Id: Ia62cb0e5046e622679143eef56a3c6782781bf59
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/129298
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>
2022-02-01 23:44:28 +01:00
..
inc pass unique_lock as param in WeakComponentImplHelperBase::disposing 2021-12-25 13:56:27 +01:00
opengl
qa/cppunit Recheck modules [a-c]* with IWYU 2022-01-13 08:26:15 +01:00
source adjust gradient drawing in vclcanvas (tdf#144073) 2022-02-01 23:44:28 +01:00
workben
CppunitTest_canvas_test.mk
Executable_canvasdemo.mk
IwyuFilter_canvas.yaml Recheck modules [a-c]* with IWYU 2022-01-13 08:26:15 +01:00
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 gbuild: build static LO / link static executables 2022-01-12 11:12:46 +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.