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Bug 607417 - Clamp the transform of fixed-position layers to work with RTL pages (interaction with bug 748384). r=ajuma

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This commit is contained in:
Kartikaya Gupta 2012-05-29 10:22:49 -04:00
parent 893d53c11b
commit ff7dbddcd6
1 changed files with 6 additions and 4 deletions
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10
gfx/layers/ipc/CompositorParent.cpp
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@ -399,10 +399,12 @@ CompositorParent::TransformShadowTree()
// Alter the scroll offset so that fixed position layers remain within
// the page area.
int offsetX = NS_MAX(0, NS_MIN(mScrollOffset.x, mContentRect.width - mWidgetSize.width));
int offsetY = NS_MAX(0, NS_MIN(mScrollOffset.y, mContentRect.height - mWidgetSize.height));
gfxPoint reverseViewTranslation(offsetX / tempScaleDiffX - metricsScrollOffset.x,
offsetY / tempScaleDiffY - metricsScrollOffset.y);
float offsetX = mScrollOffset.x / tempScaleDiffX;
float offsetY = mScrollOffset.y / tempScaleDiffY;
offsetX = NS_MAX((float)mContentRect.x, NS_MIN(offsetX, (float)(mContentRect.XMost() - mWidgetSize.width)));
offsetY = NS_MAX((float)mContentRect.y, NS_MIN(offsetY, (float)(mContentRect.YMost() - mWidgetSize.height)));
gfxPoint reverseViewTranslation(offsetX - metricsScrollOffset.x,
offsetY - metricsScrollOffset.y);
TranslateFixedLayers(layer, reverseViewTranslation);
}