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Noel Grandin 5463f2a985 Revert "clang-tidy bugprone-parent-virtual-call in canvas" 
This reverts commit eb6110aae0.

There are some odd things gone in with some of these changes that I do understand. Reverting until I have worked it out.

Change-Id: I3856b878cfaa6fd1b282a473965b2ec68779a616
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/155597
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
2023-08-13 14:03:38 +02:00
..
inc BaseMutex->std::mutex in canvas::CachedPrimitiveBase 2023-02-22 10:15:29 +00:00
opengl
qa/cppunit improve readability of VirtualDevice constructor 2023-02-07 10:19:32 +00:00
source Revert "clang-tidy bugprone-parent-virtual-call in canvas" 2023-08-13 14:03:38 +02:00
workben clang-tidy modernize-pass-by-value in canvas 2022-05-21 21:55:31 +02:00
CppunitTest_canvas_test.mk make it possible to write canvas unittests 2021-05-06 11:22:47 +02:00
Executable_canvasdemo.mk Drop support for OpenGL denylist on X11 2022-03-28 14:31:07 +02:00
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 Updated README.md files to represent current code / use Markdown format 2021-04-07 17:47:16 +02:00
README.vars
StaticLibrary_directxcanvas.mk messing with UNOMINMAX no longer seems to be necessary 2021-05-04 20:02:28 +02:00

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.