layout/style/nsStyleTransformMatrix.h
author Benoit Jacob <bjacob@mozilla.com>
Sun, 04 Dec 2011 14:15:43 -0500
changeset 81408 1a4f061c4f2d5a174fec2f7b87179561cc6ca4ff
parent 77799 e7854b4d29ba905ae3994f821b160c989bac4260
child 94484 f4157e8c410708d76703f19e4dfb61859bfe32d8
child 105276 8cfeba5239a9e4f20c462d6fb20421b4e4e7c735
permissions -rw-r--r--
Bug 704839 - [7/9] - Refactor mutual ownership of WebGL objects - r=jgilbert This patch fixes framebuffer attachment deletion.

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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