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Bug 780210: Fix B2G focus point calculation for pinching r=kats

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This commit is contained in:
Doug Sherk 2012-08-07 18:51:05 -07:00
parent bc1275627a
commit 54f9994afe
1 changed files with 4 additions and 3 deletions
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7
gfx/layers/ipc/AsyncPanZoomController.cpp
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@ -584,7 +584,8 @@ void AsyncPanZoomController::ScaleWithFocus(float aScale, const nsIntPoint& aFoc
FrameMetrics metrics(mFrameMetrics);
// Don't set the scale to the inputted value, but rather multiply it in.
float scaleFactor = aScale / metrics.mResolution.width;
float scaleFactor = aScale / metrics.mResolution.width,
oldScale = metrics.mResolution.width;
metrics.mResolution.width = metrics.mResolution.height = aScale;
@ -594,8 +595,8 @@ void AsyncPanZoomController::ScaleWithFocus(float aScale, const nsIntPoint& aFoc
nsIntPoint scrollOffset = metrics.mViewportScrollOffset;
scrollOffset.x += aFocus.x * (scaleFactor - 1.0f);
scrollOffset.y += aFocus.y * (scaleFactor - 1.0f);
scrollOffset.x += NS_lround(float(aFocus.x) * (scaleFactor - 1.0f) / oldScale);
scrollOffset.y += NS_lround(float(aFocus.y) * (scaleFactor - 1.0f) / oldScale);
metrics.mViewportScrollOffset = scrollOffset;