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17 lines
894 B
C++
17 lines
894 B
C++
diff --git a/layout/generic/nsIFrame.cpp b/layout/generic/nsIFrame.cpp
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index 67ae256038fae1d61824d58f5e544f65505a1ed5..b6e70376f1d9230df9beb01216092969e9322c8f 100644
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--- a/layout/generic/nsIFrame.cpp
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+++ b/layout/generic/nsIFrame.cpp
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@@ -11973,6 +11973,11 @@ gfx::Matrix nsIFrame::ComputeWidgetTransform() const {
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gfx::Matrix4x4 matrix = nsStyleTransformMatrix::ReadTransforms(
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uiReset->mMozWindowTransform, refBox, float(appUnitsPerDevPixel));
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+ const StyleTransformOrigin& origin = uiReset->mWindowTransformOrigin;
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+ Point transformOrigin = nsStyleTransformMatrix::Convert2DPosition(
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+ origin.horizontal, origin.vertical, refBox, appUnitsPerDevPixel);
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+ matrix.ChangeBasis(Point3D(transformOrigin.x, transformOrigin.y, 0));
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+
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gfx::Matrix result2d;
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if (!matrix.CanDraw2D(&result2d)) {
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// FIXME: It would be preferable to reject non-2D transforms at parse time.
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