https://bugs.documentfoundation.org/show_bug.cgi?id=92018
Bug ID: 92018
Summary: Implement caching for native rendering in OpenGL
rendering
Product: LibreOffice
Version: unspecified
Hardware: Other
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: graphics stack
Assignee: [email protected]
Reporter: [email protected]
One of the slowest parts of our current OpenGL rendering is rendering the
native widgets. They are currently rendered to a pixmap and later transferred
as texture to the GPU. That is a slow process and costs valuable time in the
rendering pipeline as it blocks the rendering and causes thousands of
unnecessary OpenGL calls.
it might also benefit our normal rendering if we can cache some of the widgets
that are rendered over and over again.
We should implement a cache for these native widgets that stores a texture id
in the OpenGL case and maybe a pixmap in the normal case.
For the cache to work correctly we need to use all relevant information as
cache key and have a mechanism to kick out unused entries from the cache.
In the OpenGL case we might also want to use a OpenGL texture atlas to avoid
texture fragmentation which I'll add as a second easy hack.
The place to look for it is in GtkSalGraphics::drawNativeControl.
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