The Tor Browser: content/canvas/src/CanvasUtils.h@b8a032363ba2 (annotated)

content/canvas/src/CanvasUtils.h@b8a032363ba2 (annotated)

content/canvas/src/CanvasUtils.h

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #ifndef _CANVASUTILS_H_
 #define _CANVASUTILS_H_
 #include "mozilla/CheckedInt.h"
 #include "mozilla/dom/ToJSValue.h"
 #include "jsapi.h"
 class nsIPrincipal;
 namespace mozilla {
 namespace gfx {
 class Matrix;
 }
 namespace dom {
 class HTMLCanvasElement;
 }
 namespace CanvasUtils {
 // Check that the rectangle [x,y,w,h] is a subrectangle of [0,0,realWidth,realHeight]
 inline bool CheckSaneSubrectSize(int32_t x, int32_t y, int32_t w, int32_t h,
                             int32_t realWidth, int32_t realHeight) {
     CheckedInt32 checked_xmost  = CheckedInt32(x) + w;
     CheckedInt32 checked_ymost  = CheckedInt32(y) + h;
     return w >= 0 && h >= 0 && x >= 0 && y >= 0 &&
         checked_xmost.isValid() &&
         checked_xmost.value() <= realWidth &&
         checked_ymost.isValid() &&
         checked_ymost.value() <= realHeight;
 }
 // Flag aCanvasElement as write-only if drawing an image with aPrincipal
 // onto it would make it such.
 void DoDrawImageSecurityCheck(dom::HTMLCanvasElement *aCanvasElement,
                               nsIPrincipal *aPrincipal,
                               bool forceWriteOnly,
                               bool CORSUsed);
 bool IsImageExtractionAllowed(nsIDocument *aDocument, JSContext *aCx);
 // Make a double out of |v|, treating undefined values as 0.0 (for
 // the sake of sparse arrays).  Return true iff coercion
 // succeeded.
 bool CoerceDouble(JS::Value v, double* d);
     /* Float validation stuff */
 #define VALIDATE(_f)  if (!NS_finite(_f)) return false
 inline bool FloatValidate (double f1) {
     VALIDATE(f1);
     return true;
 }
 inline bool FloatValidate (double f1, double f2) {
     VALIDATE(f1); VALIDATE(f2);
     return true;
 }
 inline bool FloatValidate (double f1, double f2, double f3) {
     VALIDATE(f1); VALIDATE(f2); VALIDATE(f3);
     return true;
 }
 inline bool FloatValidate (double f1, double f2, double f3, double f4) {
     VALIDATE(f1); VALIDATE(f2); VALIDATE(f3); VALIDATE(f4);
     return true;
 }
 inline bool FloatValidate (double f1, double f2, double f3, double f4, double f5) {
     VALIDATE(f1); VALIDATE(f2); VALIDATE(f3); VALIDATE(f4); VALIDATE(f5);
     return true;
 }
 inline bool FloatValidate (double f1, double f2, double f3, double f4, double f5, double f6) {
     VALIDATE(f1); VALIDATE(f2); VALIDATE(f3); VALIDATE(f4); VALIDATE(f5); VALIDATE(f6);
     return true;
 }
 #undef VALIDATE
 template<typename T>
 nsresult
 JSValToDashArray(JSContext* cx, const JS::Value& val,
                  FallibleTArray<T>& dashArray);
 template<typename T>
 JS::Value
 DashArrayToJSVal(FallibleTArray<T>& dashArray,
                  JSContext* cx, mozilla::ErrorResult& rv);
 template<typename T>
 nsresult
 JSValToDashArray(JSContext* cx, const JS::Value& patternArray,
                  FallibleTArray<T>& dashes)
 {
     // The cap is pretty arbitrary.  16k should be enough for
     // anybody...
     static const uint32_t MAX_NUM_DASHES = 1 << 14;
     if (!JSVAL_IS_PRIMITIVE(patternArray)) {
         JS::Rooted<JSObject*> obj(cx, JSVAL_TO_OBJECT(patternArray));
         uint32_t length;
         if (!JS_GetArrayLength(cx, obj, &length)) {
             // Not an array-like thing
             return NS_ERROR_INVALID_ARG;
         } else if (length > MAX_NUM_DASHES) {
             // Too many dashes in the pattern
             return NS_ERROR_ILLEGAL_VALUE;
         }
         bool haveNonzeroElement = false;
         for (uint32_t i = 0; i < length; ++i) {
             JS::Rooted<JS::Value> elt(cx);
             double d;
             if (!JS_GetElement(cx, obj, i, &elt)) {
                 return NS_ERROR_FAILURE;
             }
             if (!(CoerceDouble(elt, &d) &&
                   FloatValidate(d) &&
                   d >= 0.0)) {
                 // Pattern elements must be finite "numbers" >= 0.
                 return NS_ERROR_INVALID_ARG;
             } else if (d > 0.0) {
                 haveNonzeroElement = true;
             }
             if (!dashes.AppendElement(d)) {
                 return NS_ERROR_OUT_OF_MEMORY;
             }
         }
         if (dashes.Length() > 0 && !haveNonzeroElement) {
             // An all-zero pattern makes no sense.
             return NS_ERROR_ILLEGAL_VALUE;
         }
     } else if (!(JSVAL_IS_VOID(patternArray) || JSVAL_IS_NULL(patternArray))) {
         // undefined and null mean "reset to no dash".  Any other
         // random garbage is a type error.
         return NS_ERROR_INVALID_ARG;
     }
     return NS_OK;
 }
 template<typename T>
 void
 DashArrayToJSVal(FallibleTArray<T>& dashes,
                  JSContext* cx,
                  JS::MutableHandle<JS::Value> retval,
                  mozilla::ErrorResult& rv)
 {
     if (dashes.IsEmpty()) {
         retval.setNull();
         return;
     }
     JS::Rooted<JS::Value> val(cx);
     if (!mozilla::dom::ToJSValue(cx, dashes, retval)) {
         rv.Throw(NS_ERROR_OUT_OF_MEMORY);
     }
 }
 }
 }
 #endif /* _CANVASUTILS_H_ */

The Tor Browser / annotate

content/canvas/src/CanvasUtils.h@b8a032363ba2 (annotated)

content/canvas/src/CanvasUtils.h