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Bug 695832 - Perpsective origin offset should be relative to the transform origin. r=roc

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This commit is contained in:
Matt Woodrow 2011-10-26 16:20:08 +13:00
parent a4372d638f
commit c65a7204c6
1 changed files with 4 additions and 8 deletions
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12
layout/base/nsDisplayList.cpp
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@ -2466,13 +2466,6 @@ gfxPoint3D GetDeltaToMozPerspectiveOrigin(const nsIFrame* aFrame,
*coords[index] = NSAppUnitsToFloatPixels(coord.GetCoordValue(), aFactor);
}
}
/**
* An offset of (0,0) results in the perspective-origin being at the centre of the element,
* so include a shift of the centre point to (0,0).
*/
result.x -= NSAppUnitsToFloatPixels(boundingRect.width, aFactor)/2;
result.y -= NSAppUnitsToFloatPixels(boundingRect.height, aFactor)/2;
return result;
}
@ -2535,7 +2528,10 @@ nsDisplayTransform::GetResultingTransformMatrix(const nsIFrame* aFrame,
perspective._34 =
-1.0 / NSAppUnitsToFloatPixels(parentDisp->mChildPerspective.GetCoordValue(),
aFactor);
result = result * nsLayoutUtils::ChangeMatrixBasis(toPerspectiveOrigin, perspective);
/* At the point when perspective is applied, we have been translated to the transform origin.
* The translation to the perspective origin is the difference between these values.
*/
result = result * nsLayoutUtils::ChangeMatrixBasis(toPerspectiveOrigin - toMozOrigin, perspective);
}
if (aFrame->Preserves3D() && nsLayoutUtils::Are3DTransformsEnabled()) {