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CanvasUtils.cpp
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CanvasUtils.cpp
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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Vladimir Vukicevic <vladimir@pobox.com>
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include <stdlib.h>
#include <stdarg.h>
#include "prmem.h"
#include "prprf.h"
#include "nsIServiceManager.h"
#include "nsIConsoleService.h"
#include "nsIDOMDocument.h"
#include "nsIDocument.h"
#include "nsIDOMCanvasRenderingContext2D.h"
#include "nsICanvasRenderingContextInternal.h"
#include "nsHTMLCanvasElement.h"
#include "nsIPrincipal.h"
#include "nsINode.h"
#include "nsGfxCIID.h"
#include "nsTArray.h"
#include "CanvasUtils.h"
#include "mozilla/gfx/Matrix.h"
namespace mozilla {
namespace CanvasUtils {
void
DoDrawImageSecurityCheck(nsHTMLCanvasElement *aCanvasElement,
nsIPrincipal *aPrincipal,
bool forceWriteOnly,
bool CORSUsed)
{
NS_PRECONDITION(aPrincipal, "Must have a principal here");
// Callers should ensure that mCanvasElement is non-null before calling this
if (!aCanvasElement) {
NS_WARNING("DoDrawImageSecurityCheck called without canvas element!");
return;
}
if (aCanvasElement->IsWriteOnly())
return;
// If we explicitly set WriteOnly just do it and get out
if (forceWriteOnly) {
aCanvasElement->SetWriteOnly();
return;
}
// No need to do a security check if the image used CORS for the load
if (CORSUsed)
return;
bool subsumes;
nsresult rv =
aCanvasElement->NodePrincipal()->Subsumes(aPrincipal, &subsumes);
if (NS_SUCCEEDED(rv) && subsumes) {
// This canvas has access to that image anyway
return;
}
aCanvasElement->SetWriteOnly();
}
bool
CoerceDouble(jsval v, double* d)
{
if (JSVAL_IS_DOUBLE(v)) {
*d = JSVAL_TO_DOUBLE(v);
} else if (JSVAL_IS_INT(v)) {
*d = double(JSVAL_TO_INT(v));
} else if (JSVAL_IS_VOID(v)) {
*d = 0.0;
} else {
return false;
}
return true;
}
template<size_t N>
static bool
JSValToMatrixElts(JSContext* cx, const jsval& val,
double* (&elts)[N], nsresult* rv)
{
JSObject* obj;
uint32_t length;
if (JSVAL_IS_PRIMITIVE(val) ||
!(obj = JSVAL_TO_OBJECT(val)) ||
!JS_GetArrayLength(cx, obj, &length) ||
N != length) {
// Not an array-like thing or wrong size
*rv = NS_ERROR_INVALID_ARG;
return false;
}
for (PRUint32 i = 0; i < N; ++i) {
jsval elt;
double d;
if (!JS_GetElement(cx, obj, i, &elt)) {
*rv = NS_ERROR_FAILURE;
return false;
}
if (!CoerceDouble(elt, &d)) {
*rv = NS_ERROR_INVALID_ARG;
return false;
}
if (!FloatValidate(d)) {
// This is weird, but it's the behavior of SetTransform()
*rv = NS_OK;
return false;
}
*elts[i] = d;
}
*rv = NS_OK;
return true;
}
bool
JSValToMatrix(JSContext* cx, const jsval& val, gfxMatrix* matrix, nsresult* rv)
{
double* elts[] = { &matrix->xx, &matrix->yx, &matrix->xy, &matrix->yy,
&matrix->x0, &matrix->y0 };
return JSValToMatrixElts(cx, val, elts, rv);
}
bool
JSValToMatrix(JSContext* cx, const jsval& val, Matrix* matrix, nsresult* rv)
{
gfxMatrix m;
if (!JSValToMatrix(cx, val, &m, rv))
return false;
*matrix = Matrix(Float(m.xx), Float(m.yx), Float(m.xy), Float(m.yy),
Float(m.x0), Float(m.y0));
return true;
}
template<size_t N>
static nsresult
MatrixEltsToJSVal(/*const*/ jsval (&elts)[N], JSContext* cx, jsval* val)
{
JSObject* obj = JS_NewArrayObject(cx, N, elts);
if (!obj) {
return NS_ERROR_OUT_OF_MEMORY;
}
*val = OBJECT_TO_JSVAL(obj);
return NS_OK;
}
nsresult
MatrixToJSVal(const gfxMatrix& matrix, JSContext* cx, jsval* val)
{
jsval elts[] = {
DOUBLE_TO_JSVAL(matrix.xx), DOUBLE_TO_JSVAL(matrix.yx),
DOUBLE_TO_JSVAL(matrix.xy), DOUBLE_TO_JSVAL(matrix.yy),
DOUBLE_TO_JSVAL(matrix.x0), DOUBLE_TO_JSVAL(matrix.y0)
};
return MatrixEltsToJSVal(elts, cx, val);
}
nsresult
MatrixToJSVal(const Matrix& matrix, JSContext* cx, jsval* val)
{
jsval elts[] = {
DOUBLE_TO_JSVAL(matrix._11), DOUBLE_TO_JSVAL(matrix._12),
DOUBLE_TO_JSVAL(matrix._21), DOUBLE_TO_JSVAL(matrix._22),
DOUBLE_TO_JSVAL(matrix._31), DOUBLE_TO_JSVAL(matrix._32)
};
return MatrixEltsToJSVal(elts, cx, val);
}
} // namespace CanvasUtils
} // namespace mozilla