History

Caolán McNamara d5ad9c0777 cid#1556086 COPY_INSTEAD_OF_MOVE and cid#1556087 COPY_INSTEAD_OF_MOVE cid#1556093 COPY_INSTEAD_OF_MOVE cid#1556094 COPY_INSTEAD_OF_MOVE cid#1556105 COPY_INSTEAD_OF_MOVE cid#1556121 COPY_INSTEAD_OF_MOVE cid#1556184 COPY_INSTEAD_OF_MOVE cid#1556399 COPY_INSTEAD_OF_MOVE cid#1556405 COPY_INSTEAD_OF_MOVE cid#1556419 COPY_INSTEAD_OF_MOVE cid#1556421 COPY_INSTEAD_OF_MOVE cid#1556444 COPY_INSTEAD_OF_MOVE cid#1556448 COPY_INSTEAD_OF_MOVE cid#1556457 COPY_INSTEAD_OF_MOVE cid#1556468 COPY_INSTEAD_OF_MOVE Change-Id: I1f352682daebd4e3ed2e7fe669aa0943dcc33edd Reviewed-on: https://gerrit.libreoffice.org/c/core/+/171372 Reviewed-by: Caolán McNamara <caolan.mcnamara@collabora.com> Tested-by: Jenkins		2024-08-02 10:05:45 +02:00
..
inc/pch	simplify and modernise ScopedBitmapAccess	2023-12-07 09:32:14 +01:00
opengl	Remove unused 'numTiles' from glitter vertex shader	2024-06-03 15:18:08 +02:00
qa	loplugin:ostr in slideshow	2024-05-13 14:44:04 +02:00
source	cid#1556086 COPY_INSTEAD_OF_MOVE	2024-08-02 10:05:45 +02:00
test	c++20: use std::erase(_if) instead of std::remove(_if)+erase (part 11)	2023-11-19 13:41:30 +01:00
util
CppunitTest_slideshow.mk
CppunitTest_slideshow_engine.mk
IwyuFilter_slideshow.yaml
Library_OGLTrans.mk	Drop remaining boost/shared_pointer debug functionality	2024-03-21 12:28:32 +01:00
Library_slideshow.mk	Drop remaining boost/shared_pointer debug functionality	2024-03-21 12:28:32 +01:00
Makefile
manifest.txt
Module_slideshow.mk
Package_opengl.mk
README.md

README.md

Impress Slideshow Engine

3D Transitions

The 3D transitions are slideshow transition engine using OpenGL and are located in slideshow/source/engine/OGLTrans/. They were initially written by GSOC student Shane.M.Mathews. Radek has later polished the code a bit, added few new 3D transitions, added infrastructure for vertex and fragment shaders. Wrote few transitions with fragment shader too.

Physics Animation Effects

Physics animation effects are simulated by external 2d physics engine library Box2D. They don't directly call Box2D functions but instead use the wrapper in:

slideshow/source/inc/box2dtools.hxx
slideshow/source/engine/box2dtools.cxx

The wrapper has two corresponding classes to manage the Box2D world and Box2D bodies.

When a physics animation starts, a Box2DWorld is initiated and populated with every shape that is part of the foreground (which are shapes that do not belong to the master slide and not a background shape).

After creation until the end of the slide (not the whole slideshow) the Box2D World isn't destroyed and reused. But the bodies that represent the shapes in the slide get destroyed when there's a point in time that there's no physics animation in progress. And recreated when another physics animation starts.

If there are multiple physics animations in parallel only one of them takes the role of stepping through the simulation.

If there are other animation effects that go in parallel which change the shape position, rotation, or visibility - they also report the change to Box2DWorld. These updates are collected in a queue in Box2DWorld and processed before stepping through the simulation. To achieve convincing results these updates are performed by setting the Box2D body's linear velocity or angular velocity instead of setting directly it's position or rotation.