LCOV - code coverage report
Current view: directory - content/canvas/src - CanvasUtils.h (source / functions) Found Hit Coverage
Test: app.info Lines: 60 0 0.0 %
Date: 2012-06-02 Functions: 11 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                 : #ifndef _CANVASUTILS_H_
      39                 : #define _CANVASUTILS_H_
      40                 : 
      41                 : #include "prtypes.h"
      42                 : 
      43                 : #include "CheckedInt.h"
      44                 : 
      45                 : class nsHTMLCanvasElement;
      46                 : class nsIPrincipal;
      47                 : 
      48                 : namespace mozilla {
      49                 : 
      50                 : namespace gfx {
      51                 : class Matrix;
      52                 : }
      53                 : 
      54                 : namespace CanvasUtils {
      55                 : 
      56                 : using namespace gfx;
      57                 : 
      58                 : // Check that the rectangle [x,y,w,h] is a subrectangle of [0,0,realWidth,realHeight]
      59                 : 
      60               0 : inline bool CheckSaneSubrectSize(PRInt32 x, PRInt32 y, PRInt32 w, PRInt32 h,
      61                 :                             PRInt32 realWidth, PRInt32 realHeight) {
      62               0 :     CheckedInt32 checked_xmost  = CheckedInt32(x) + w;
      63               0 :     CheckedInt32 checked_ymost  = CheckedInt32(y) + h;
      64                 : 
      65                 :     return w >= 0 && h >= 0 && x >= 0 && y >= 0 &&
      66               0 :         checked_xmost.valid() &&
      67               0 :         checked_xmost.value() <= realWidth &&
      68               0 :         checked_ymost.valid() &&
      69               0 :         checked_ymost.value() <= realHeight;
      70                 : }
      71                 : 
      72                 : // Flag aCanvasElement as write-only if drawing an image with aPrincipal
      73                 : // onto it would make it such.
      74                 : 
      75                 : void DoDrawImageSecurityCheck(nsHTMLCanvasElement *aCanvasElement,
      76                 :                               nsIPrincipal *aPrincipal,
      77                 :                               bool forceWriteOnly,
      78                 :                               bool CORSUsed);
      79                 : 
      80                 : // Make a double out of |v|, treating undefined values as 0.0 (for
      81                 : // the sake of sparse arrays).  Return true iff coercion
      82                 : // succeeded.
      83                 : bool CoerceDouble(jsval v, double* d);
      84                 : 
      85                 : // Return true iff the conversion succeeded, false otherwise.  *rv is
      86                 : // the value to return to script if this returns false.
      87                 : bool JSValToMatrix(JSContext* cx, const jsval& val,
      88                 :                    gfxMatrix* matrix, nsresult* rv);
      89                 : bool JSValToMatrix(JSContext* cx, const jsval& val,
      90                 :                    Matrix* matrix, nsresult* rv);
      91                 : 
      92                 : nsresult MatrixToJSVal(const gfxMatrix& matrix,
      93                 :                        JSContext* cx, jsval* val);
      94                 : nsresult MatrixToJSVal(const Matrix& matrix,
      95                 :                        JSContext* cx, jsval* val);
      96                 : 
      97                 :     /* Float validation stuff */
      98                 : #define VALIDATE(_f)  if (!NS_finite(_f)) return false
      99                 : 
     100               0 : inline bool FloatValidate (double f1) {
     101               0 :     VALIDATE(f1);
     102               0 :     return true;
     103                 : }
     104                 : 
     105               0 : inline bool FloatValidate (double f1, double f2) {
     106               0 :     VALIDATE(f1); VALIDATE(f2);
     107               0 :     return true;
     108                 : }
     109                 : 
     110               0 : inline bool FloatValidate (double f1, double f2, double f3) {
     111               0 :     VALIDATE(f1); VALIDATE(f2); VALIDATE(f3);
     112               0 :     return true;
     113                 : }
     114                 : 
     115               0 : inline bool FloatValidate (double f1, double f2, double f3, double f4) {
     116               0 :     VALIDATE(f1); VALIDATE(f2); VALIDATE(f3); VALIDATE(f4);
     117               0 :     return true;
     118                 : }
     119                 : 
     120               0 : inline bool FloatValidate (double f1, double f2, double f3, double f4, double f5) {
     121               0 :     VALIDATE(f1); VALIDATE(f2); VALIDATE(f3); VALIDATE(f4); VALIDATE(f5);
     122               0 :     return true;
     123                 : }
     124                 : 
     125               0 : inline bool FloatValidate (double f1, double f2, double f3, double f4, double f5, double f6) {
     126               0 :     VALIDATE(f1); VALIDATE(f2); VALIDATE(f3); VALIDATE(f4); VALIDATE(f5); VALIDATE(f6);
     127               0 :     return true;
     128                 : }
     129                 : 
     130                 : #undef VALIDATE
     131                 : 
     132                 : template<typename T>
     133                 : nsresult
     134                 : JSValToDashArray(JSContext* cx, const jsval& val,
     135                 :                  FallibleTArray<T>& dashArray);
     136                 : 
     137                 : template<typename T>
     138                 : nsresult
     139                 : DashArrayToJSVal(FallibleTArray<T>& dashArray,
     140                 :                  JSContext* cx, jsval* val);
     141                 : 
     142                 : template<typename T>
     143                 : nsresult
     144                 : JSValToDashArray(JSContext* cx, const jsval& patternArray,
     145               0 :                  FallibleTArray<T>& dashes)
     146                 : {
     147                 :     // The cap is pretty arbitrary.  16k should be enough for
     148                 :     // anybody...
     149                 :     static const uint32_t MAX_NUM_DASHES = 1 << 14;
     150                 : 
     151               0 :     if (!JSVAL_IS_PRIMITIVE(patternArray)) {
     152               0 :         JSObject* obj = JSVAL_TO_OBJECT(patternArray);
     153                 :         uint32_t length;
     154               0 :         if (!JS_GetArrayLength(cx, obj, &length)) {
     155                 :             // Not an array-like thing
     156               0 :             return NS_ERROR_INVALID_ARG;
     157               0 :         } else if (length > MAX_NUM_DASHES) {
     158                 :             // Too many dashes in the pattern
     159               0 :             return NS_ERROR_ILLEGAL_VALUE;
     160                 :         }
     161                 : 
     162               0 :         bool haveNonzeroElement = false;
     163               0 :         for (uint32 i = 0; i < length; ++i) {
     164                 :             jsval elt;
     165                 :             double d;
     166               0 :             if (!JS_GetElement(cx, obj, i, &elt)) {
     167               0 :                 return NS_ERROR_FAILURE;
     168                 :             }
     169               0 :             if (!(CoerceDouble(elt, &d) &&
     170                 :                   FloatValidate(d) &&
     171                 :                   d >= 0.0)) {
     172                 :                 // Pattern elements must be finite "numbers" >= 0.
     173               0 :                 return NS_ERROR_INVALID_ARG;
     174               0 :             } else if (d > 0.0) {
     175               0 :                 haveNonzeroElement = true;
     176                 :             }
     177               0 :             if (!dashes.AppendElement(d)) {
     178               0 :                 return NS_ERROR_OUT_OF_MEMORY;
     179                 :             }
     180                 :         }
     181                 : 
     182               0 :         if (dashes.Length() > 0 && !haveNonzeroElement) {
     183                 :             // An all-zero pattern makes no sense.
     184               0 :             return NS_ERROR_ILLEGAL_VALUE;
     185                 :         }
     186               0 :     } else if (!(JSVAL_IS_VOID(patternArray) || JSVAL_IS_NULL(patternArray))) {
     187                 :         // undefined and null mean "reset to no dash".  Any other
     188                 :         // random garbage is a type error.
     189               0 :         return NS_ERROR_INVALID_ARG;
     190                 :     }
     191                 : 
     192               0 :     return NS_OK;
     193                 : }
     194                 : 
     195                 : template<typename T>
     196                 : nsresult
     197                 : DashArrayToJSVal(FallibleTArray<T>& dashes,
     198               0 :                  JSContext* cx, jsval* val)
     199                 : {
     200               0 :     if (dashes.IsEmpty()) {
     201               0 :         *val = JSVAL_NULL;
     202                 :     } else {
     203               0 :         JSObject* obj = JS_NewArrayObject(cx, dashes.Length(), nsnull);
     204               0 :         if (!obj) {
     205               0 :             return NS_ERROR_OUT_OF_MEMORY;
     206                 :         }
     207               0 :         for (PRUint32 i = 0; i < dashes.Length(); ++i) {
     208               0 :             double d = dashes[i];
     209               0 :             jsval elt = DOUBLE_TO_JSVAL(d);
     210               0 :             if (!JS_SetElement(cx, obj, i, &elt)) {
     211               0 :                 return NS_ERROR_FAILURE;
     212                 :             }
     213                 :         }
     214               0 :         *val = OBJECT_TO_JSVAL(obj);
     215                 :     }
     216               0 :     return NS_OK;
     217                 : }
     218                 : 
     219                 : }
     220                 : }
     221                 : 
     222                 : #endif /* _CANVASUTILS_H_ */

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