Details
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Bug
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Resolution: Done
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P3: Somewhat important
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5.0.0
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None
Description
I am observing non-smooth rendering with an AMD Z430 GPU. The long frame times appear to occur due to QSGDefaultDistanceFieldGlyphCache::storeGlyphs() (in particular the call to resizeTexture() appears to be slow).
Changing QSGDefaultDistanceFieldGlyphCache::useWorkaroundBrokenFBOReadback() to return true greatly improves the situation. However, there are still significant missed frames.
Adding a QElapsedTimer to storeGlyphs, and flicking a list with text, the following times are initially reported (in ms):
178, 46, 72, 66, 69
with the workaround enabled, the times are (in ms):
21, 22, 30, 22, 21
Attachments
Issue Links
- relates to
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- Closed
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QTBUG-19096 Cross-process cache for text renderer(s) in SceneGraph
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- Open
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| For Gerrit Dashboard: QTBUG-29264 | ||||||
|---|---|---|---|---|---|---|
| # | Subject | Branch | Project | Status | CR | V |
| 52323,1 | Provide workaround to slow glyph cache updates. | stable | qt/qtdeclarative | Status: MERGED | +2 | 0 |
| 107092,3 | Allow glyph cache textures to be created at full size. | 5.5 | qt/qtdeclarative | Status: MERGED | +2 | 0 |
| 107571,2 | Use of fullsize distance field textures should be font-dependent. | 5.5 | qt/qtdeclarative | Status: MERGED | +2 | 0 |