LCOV - code coverage report
Current view: directory - content/canvas/src - CanvasUtils.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 69 0 0.0 %
Date: 2012-06-02 Functions: 8 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is mozilla.org code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  *   Vladimir Vukicevic <vladimir@pobox.com>
      19                 :  * Portions created by the Initial Developer are Copyright (C) 2009
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      26                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : #include <stdlib.h>
      39                 : #include <stdarg.h>
      40                 : 
      41                 : #include "prmem.h"
      42                 : #include "prprf.h"
      43                 : 
      44                 : #include "nsIServiceManager.h"
      45                 : 
      46                 : #include "nsIConsoleService.h"
      47                 : #include "nsIDOMDocument.h"
      48                 : #include "nsIDocument.h"
      49                 : #include "nsIDOMCanvasRenderingContext2D.h"
      50                 : #include "nsICanvasRenderingContextInternal.h"
      51                 : #include "nsHTMLCanvasElement.h"
      52                 : #include "nsIPrincipal.h"
      53                 : #include "nsINode.h"
      54                 : 
      55                 : #include "nsGfxCIID.h"
      56                 : 
      57                 : #include "nsTArray.h"
      58                 : 
      59                 : #include "CanvasUtils.h"
      60                 : #include "mozilla/gfx/Matrix.h"
      61                 : 
      62                 : namespace mozilla {
      63                 : namespace CanvasUtils {
      64                 : 
      65                 : void
      66               0 : DoDrawImageSecurityCheck(nsHTMLCanvasElement *aCanvasElement,
      67                 :                          nsIPrincipal *aPrincipal,
      68                 :                          bool forceWriteOnly,
      69                 :                          bool CORSUsed)
      70                 : {
      71               0 :     NS_PRECONDITION(aPrincipal, "Must have a principal here");
      72                 : 
      73                 :     // Callers should ensure that mCanvasElement is non-null before calling this
      74               0 :     if (!aCanvasElement) {
      75               0 :         NS_WARNING("DoDrawImageSecurityCheck called without canvas element!");
      76               0 :         return;
      77                 :     }
      78                 : 
      79               0 :     if (aCanvasElement->IsWriteOnly())
      80               0 :         return;
      81                 : 
      82                 :     // If we explicitly set WriteOnly just do it and get out
      83               0 :     if (forceWriteOnly) {
      84               0 :         aCanvasElement->SetWriteOnly();
      85               0 :         return;
      86                 :     }
      87                 : 
      88                 :     // No need to do a security check if the image used CORS for the load
      89               0 :     if (CORSUsed)
      90               0 :         return;
      91                 : 
      92                 :     bool subsumes;
      93                 :     nsresult rv =
      94               0 :         aCanvasElement->NodePrincipal()->Subsumes(aPrincipal, &subsumes);
      95                 : 
      96               0 :     if (NS_SUCCEEDED(rv) && subsumes) {
      97                 :         // This canvas has access to that image anyway
      98               0 :         return;
      99                 :     }
     100                 : 
     101               0 :     aCanvasElement->SetWriteOnly();
     102                 : }
     103                 : 
     104                 : bool
     105               0 : CoerceDouble(jsval v, double* d)
     106                 : {
     107               0 :     if (JSVAL_IS_DOUBLE(v)) {
     108               0 :         *d = JSVAL_TO_DOUBLE(v);
     109               0 :     } else if (JSVAL_IS_INT(v)) {
     110               0 :         *d = double(JSVAL_TO_INT(v));
     111               0 :     } else if (JSVAL_IS_VOID(v)) {
     112               0 :         *d = 0.0;
     113                 :     } else {
     114               0 :         return false;
     115                 :     }
     116               0 :     return true;
     117                 : }
     118                 : 
     119                 : template<size_t N>
     120                 : static bool
     121               0 : JSValToMatrixElts(JSContext* cx, const jsval& val,
     122                 :                   double* (&elts)[N], nsresult* rv)
     123                 : {
     124                 :     JSObject* obj;
     125                 :     uint32_t length;
     126                 : 
     127               0 :     if (JSVAL_IS_PRIMITIVE(val) ||
     128                 :         !(obj = JSVAL_TO_OBJECT(val)) ||
     129                 :         !JS_GetArrayLength(cx, obj, &length) ||
     130                 :         N != length) {
     131                 :         // Not an array-like thing or wrong size
     132               0 :         *rv = NS_ERROR_INVALID_ARG;
     133               0 :         return false;
     134                 :     }
     135                 : 
     136               0 :     for (PRUint32 i = 0; i < N; ++i) {
     137                 :         jsval elt;
     138                 :         double d;
     139               0 :         if (!JS_GetElement(cx, obj, i, &elt)) {
     140               0 :             *rv = NS_ERROR_FAILURE;
     141               0 :             return false;
     142                 :         }
     143               0 :         if (!CoerceDouble(elt, &d)) {
     144               0 :             *rv = NS_ERROR_INVALID_ARG;
     145               0 :             return false;
     146                 :         }
     147               0 :         if (!FloatValidate(d)) {
     148                 :             // This is weird, but it's the behavior of SetTransform()
     149               0 :             *rv = NS_OK;
     150               0 :             return false;
     151                 :         }
     152               0 :         *elts[i] = d;
     153                 :     }
     154                 : 
     155               0 :     *rv = NS_OK;
     156               0 :     return true;
     157                 : }
     158                 : 
     159                 : bool
     160               0 : JSValToMatrix(JSContext* cx, const jsval& val, gfxMatrix* matrix, nsresult* rv)
     161                 : {
     162                 :     double* elts[] = { &matrix->xx, &matrix->yx, &matrix->xy, &matrix->yy,
     163               0 :                        &matrix->x0, &matrix->y0 };
     164               0 :     return JSValToMatrixElts(cx, val, elts, rv);
     165                 : }
     166                 : 
     167                 : bool
     168               0 : JSValToMatrix(JSContext* cx, const jsval& val, Matrix* matrix, nsresult* rv)
     169                 : {
     170               0 :     gfxMatrix m;
     171               0 :     if (!JSValToMatrix(cx, val, &m, rv))
     172               0 :         return false;
     173                 :     *matrix = Matrix(Float(m.xx), Float(m.yx), Float(m.xy), Float(m.yy),
     174               0 :                      Float(m.x0), Float(m.y0));
     175               0 :     return true;
     176                 : }
     177                 : 
     178                 : template<size_t N>
     179                 : static nsresult
     180               0 : MatrixEltsToJSVal(/*const*/ jsval (&elts)[N], JSContext* cx, jsval* val)
     181                 : {
     182               0 :     JSObject* obj = JS_NewArrayObject(cx, N, elts);
     183               0 :     if  (!obj) {
     184               0 :         return NS_ERROR_OUT_OF_MEMORY;
     185                 :     }
     186                 : 
     187               0 :     *val = OBJECT_TO_JSVAL(obj);
     188                 : 
     189               0 :     return NS_OK;
     190                 : }
     191                 : 
     192                 : nsresult
     193               0 : MatrixToJSVal(const gfxMatrix& matrix, JSContext* cx, jsval* val)
     194                 : {
     195                 :     jsval elts[] = {
     196               0 :         DOUBLE_TO_JSVAL(matrix.xx), DOUBLE_TO_JSVAL(matrix.yx),
     197               0 :         DOUBLE_TO_JSVAL(matrix.xy), DOUBLE_TO_JSVAL(matrix.yy),
     198               0 :         DOUBLE_TO_JSVAL(matrix.x0), DOUBLE_TO_JSVAL(matrix.y0)
     199               0 :     };
     200               0 :     return MatrixEltsToJSVal(elts, cx, val);
     201                 : }
     202                 : 
     203                 : nsresult
     204               0 : MatrixToJSVal(const Matrix& matrix, JSContext* cx, jsval* val)
     205                 : {
     206                 :     jsval elts[] = {
     207               0 :         DOUBLE_TO_JSVAL(matrix._11), DOUBLE_TO_JSVAL(matrix._12),
     208               0 :         DOUBLE_TO_JSVAL(matrix._21), DOUBLE_TO_JSVAL(matrix._22),
     209               0 :         DOUBLE_TO_JSVAL(matrix._31), DOUBLE_TO_JSVAL(matrix._32)
     210               0 :     };
     211               0 :     return MatrixEltsToJSVal(elts, cx, val);
     212                 : }
     213                 : 
     214                 : } // namespace CanvasUtils
     215                 : } // namespace mozilla

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