The Tor Browser: gfx/src/nsTransform2D.h@97036ab72558

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

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

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #ifndef nsTransform2D_h___

     7 #define nsTransform2D_h___

     9 #include "gfxCore.h"

    10 #include "nsCoord.h"

    12 class NS_GFX nsTransform2D

    13 {

    14 private:

    15  /**

    16   * This represents the following matrix (note that the order of row/column

    17   * indices is opposite to usual notation)

    18   *

    19   *      / m00   0   m20  \

    20   * M =  |  0   m11  m21  |

    21   *      \  0    0    1   /

    22   *

    23   * Transformation of a coordinate (x, y) is obtained by setting

    24   * v = (x, y, 1)^T and evaluating  M . v

    25   **/

    27   float     m00, m11, m20, m21;

    29 public:

    30   nsTransform2D(void)                         { m20 = m21 = 0.0f; m00 = m11 = 1.0f; }

    31   nsTransform2D(nsTransform2D *aTransform2D)  {

    32     m00 = aTransform2D->m00;

    33     m11 = aTransform2D->m11;

    34     m20 = aTransform2D->m20;

    35     m21 = aTransform2D->m21;

    36   }

    38   ~nsTransform2D(void)                        { }

    40  /**

    41   * set this transform to a translation

    42   *

    43   * @param      tx, x translation

    44   * @param      ty, y translation

    45   **/

    47   void SetToTranslate(float tx, float ty)    { m00 = m11 = 1.0f; m20 = tx; m21 = ty; }

    49  /**

    50   * get the translation portion of this transform

    51   *

    52   * @param      pt, Point to return translation values in

    53   **/

    55   void GetTranslationCoord(nscoord *ptX, nscoord *ptY) const { *ptX = NSToCoordRound(m20); *ptY = NSToCoordRound(m21); }

    57  /**

    58   * apply matrix to vector

    59   *

    60   * @param    pt Point to transform

    61   **/

    63   void TransformCoord(nscoord *ptX, nscoord *ptY) const;

    65  /**

    66   * apply matrix to rect

    67   *

    68   * @param    rect Rect to transform

    69   **/

    71   void TransformCoord(nscoord *aX, nscoord *aY, nscoord *aWidth, nscoord *aHeight) const;

    73  /**

    74   * add a scale to a Transform via x, y pair

    75   *

    76   * @param    ptX x value to add as x scale

    77   * @param    ptY y value to add as y scale

    78   **/

    80   void AddScale(float ptX, float ptY) { m00 *= ptX; m11 *= ptY; }

    82  /**

    83   * Set the scale (overriding any previous calls to AddScale, but leaving

    84   * any existing translation).

    85   *

    86   * @param    ptX x value to add as x scale

    87   * @param    ptY y value to add as y scale

    88   **/

    90   void SetScale(float ptX, float ptY) { m00 = ptX; m11 = ptY; }

    91 };

    93 #endif

The Tor Browser / file revision

gfx/src/nsTransform2D.h@97036ab72558

gfx/src/nsTransform2D.h