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Bug 803013 - Update valid region progressively with tiles. r=bgirard

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When updating tiles progressively, make sure the valid region is also updated
progressively to avoid flickering.
This commit is contained in:
Chris Lord 2012-10-23 19:30:35 +01:00
parent 0b68e165ed
commit 7a4b155c59
1 changed files with 10 additions and 1 deletions
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11
gfx/layers/basic/BasicTiledThebesLayer.cpp
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@ -410,7 +410,10 @@ BasicTiledThebesLayer::PaintThebes(gfxContext* aContext,
transform.Invert();
// Store the old valid region, then clear it before painting.
// We clip the old valid region to the visible region, as it only gets
// used to decide stale content (currently valid and previously visible)
nsIntRegion oldValidRegion = mTiledBuffer.GetValidRegion();
oldValidRegion.And(oldValidRegion, mVisibleRegion);
mTiledBuffer.ClearPaintedRegion();
// Make sure that tiles that fall outside of the visible region are
@ -453,8 +456,14 @@ BasicTiledThebesLayer::PaintThebes(gfxContext* aContext,
// Keep track of what we're about to refresh.
mValidRegion.Or(mValidRegion, regionToPaint);
// mValidRegion would have been altered by InvalidateRegion, but we still
// want to display stale content until it gets progressively updated.
// Create a region that includes stale content.
nsIntRegion validOrStale;
validOrStale.Or(mValidRegion, oldValidRegion);
// Paint the computed region and subtract it from the invalid region.
mTiledBuffer.PaintThebes(this, mValidRegion, regionToPaint, aCallback, aCallbackData);
mTiledBuffer.PaintThebes(this, validOrStale, regionToPaint, aCallback, aCallbackData);
invalidRegion.Sub(invalidRegion, regionToPaint);
} while (repeat);
} else {