gecko-dev/layout/style/nsStyleTransformMatrix.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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* 1.1 (the "License"); you may not use this file except in compliance with
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* The Original Code is mozilla.org code.
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* The Initial Developer of the Original Code is
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* Contributor(s):
* Keith Schwarz <kschwarz@mozilla.com> (original author)
* Matt Woodrow <mwoodrow@mozilla.com>
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/*
* A class representing three matrices that can be used for style transforms.
*/
#ifndef nsStyleTransformMatrix_h_
#define nsStyleTransformMatrix_h_
#include "nsCSSValue.h"
#include "gfxMatrix.h"
#include "gfx3DMatrix.h"
#include "nsRect.h"
struct nsCSSValueList;
class nsStyleContext;
class nsPresContext;
/**
* A helper to generate gfxMatrixes from css transform functions.
*/
namespace nsStyleTransformMatrix {
/**
* Return the transform function, as an nsCSSKeyword, for the given
* nsCSSValue::Array from a transform list.
*/
nsCSSKeyword TransformFunctionOf(const nsCSSValue::Array* aData);
/**
* Given an nsCSSValueList containing -moz-transform functions,
* returns a matrix containing the value of those functions.
*
* @param aData The nsCSSValueList containing the transform functions
* @param aContext The style context, used for unit conversion.
* @param aPresContext The presentation context, used for unit conversion.
* @param aCanStoreInRuleTree Set to false if the result cannot be cached
* in the rule tree, otherwise untouched.
* @param aBounds The frame's bounding rectangle.
* @param aAppUnitsPerMatrixUnit The number of app units per device pixel.
*
* aContext and aPresContext may be null if all of the (non-percent)
* length values in aData are already known to have been converted to
* eCSSUnit_Pixel (as they are in an nsStyleAnimation::Value)
*/
gfx3DMatrix ReadTransforms(const nsCSSValueList* aList,
nsStyleContext* aContext,
nsPresContext* aPresContext,
bool &aCanStoreInRuleTree,
nsRect& aBounds,
float aAppUnitsPerMatrixUnit);
} // namespace nsStyleTransformMatrix
#endif