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Bug 1164340. Fix up some scrollbar related comments in AsyncCompositionManager. r=botond

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This commit is contained in:
Timothy Nikkel 2015-05-13 19:15:39 -05:00
parent 6118e68d2c
commit c7fe5b456b
1 changed files with 4 additions and 3 deletions
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7
gfx/layers/composite/AsyncCompositionManager.cpp
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@ -730,9 +730,7 @@ ApplyAsyncTransformToScrollbarForContent(Layer* aScrollbar,
// fraction of the whole srollable rect that is in view.
const float yScale = 1.f / asyncZoomY;
// Note: |metrics.GetZoom()| doesn't yet include the async zoom, so
// |metrics.CalculateCompositedSizeInCssPixels()| would not give a correct
// result.
// Note: |metrics.GetZoom()| doesn't yet include the async zoom.
const CSSToParentLayerScale effectiveZoom(metrics.GetZoom().yScale * asyncZoomY);
// Here we convert the scrollbar thumb ratio into a true unitless ratio by
@ -740,6 +738,9 @@ ApplyAsyncTransformToScrollbarForContent(Layer* aScrollbar,
// to the scrollframe's space.
const float ratio = aScrollbar->GetScrollbarThumbRatio() /
(metrics.GetPresShellResolution() * asyncZoomY);
// The scroll thumb needs to be translated in opposite direction of the
// async scroll. This is because scrolling down, which translates the layer
// content up, should result in moving the scroll thumb down.
ParentLayerCoord yTranslation = -asyncScrollY * ratio;
// The scroll thumb additionally needs to be translated to compensate for