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| author | Paul Wicking <paul.wicking@qt.io> | 2018-09-26 12:53:57 +0200 |
|---|---|---|
| committer | Paul Wicking <paul.wicking@qt.io> | 2018-09-26 18:59:24 +0000 |
| commit | 3716de0253a6520106145d783cec4c8993915bae (patch) | |
| tree | 7a41fc8b241e2d00cda73764d5bfa3d704731e4b /src | |
| parent | d6cc8f19f1dffe9083f5b70b6d5de33a2082f12f (diff) | |
Doc: Add description of QML_USE_GLYPHCACHE_WORKAROUND env var
Change-Id: I71e2fcaa4358a20bc6ec5b1c89a24b23549f1334
Fixes: QTBUG-59992
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
Diffstat (limited to 'src')
| -rw-r--r-- | src/quick/doc/src/concepts/visualcanvas/scenegraph.qdoc | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/quick/doc/src/concepts/visualcanvas/scenegraph.qdoc b/src/quick/doc/src/concepts/visualcanvas/scenegraph.qdoc index 99175ab94e..4c94259139 100644 --- a/src/quick/doc/src/concepts/visualcanvas/scenegraph.qdoc +++ b/src/quick/doc/src/concepts/visualcanvas/scenegraph.qdoc @@ -796,6 +796,14 @@ with multiple windows. \li Mipmapped Image items are not placed in the global atlas and will not be batched. + \li A bug in the OpenGL driver related to framebuffer object (FBO) readbacks + may corrupt rendered glyphs. If you set the \c QML_USE_GLYPHCACHE_WORKAROUND + environment variable, Qt keeps an additional copy of the glyph in RAM. This + means that performance is slightly lower when drawing glyphs that have not + been drawn before, as Qt accesses the extra copy via the CPU. It also means + that the glyph cache will use twice as much memory. The quality is not + affected by this. + \endlist If an application performs poorly, make sure that rendering is |