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      1 /*
      2  * Copyright (C) 2009, 2010 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "V8HTMLImageElementConstructor.h"
     33 
     34 #include "HTMLImageElement.h"
     35 #include "Document.h"
     36 #include "Frame.h"
     37 #include "HTMLNames.h"
     38 #include "V8Binding.h"
     39 #include "V8Document.h"
     40 #include "V8HTMLImageElement.h"
     41 #include "V8Proxy.h"
     42 
     43 #include <wtf/RefPtr.h>
     44 
     45 namespace WebCore {
     46 
     47   WrapperTypeInfo V8HTMLImageElementConstructor::info = { V8HTMLImageElementConstructor::GetTemplate, 0, 0, 0 };
     48 
     49 static v8::Handle<v8::Value> v8HTMLImageElementConstructorCallback(const v8::Arguments& args)
     50 {
     51     INC_STATS("DOM.HTMLImageElement.Contructor");
     52 
     53     if (!args.IsConstructCall())
     54         return throwError("DOM object constructor cannot be called as a function.");
     55 
     56     Frame* frame = V8Proxy::retrieveFrameForCurrentContext();
     57     if (!frame)
     58         return throwError("Image constructor associated frame is unavailable", V8Proxy::ReferenceError);
     59 
     60     Document* document = frame->document();
     61     if (!document)
     62         return throwError("Image constructor associated document is unavailable", V8Proxy::ReferenceError);
     63 
     64     // Make sure the document is added to the DOM Node map. Otherwise, the HTMLImageElement instance
     65     // may end up being the only node in the map and get garbage-ccollected prematurely.
     66     // FIXME: The correct way to do this would be to make HTMLImageElement derive from
     67     // ActiveDOMObject and use its interface to keep its wrapper alive. Then we would
     68     // remove this code and the special case in isObservableThroughDOM.
     69     toV8(document);
     70 
     71     int width;
     72     int height;
     73     int* optionalWidth = 0;
     74     int* optionalHeight = 0;
     75     if (args.Length() > 0) {
     76         width = toInt32(args[0]);
     77         optionalWidth = &width;
     78     }
     79     if (args.Length() > 1) {
     80         height = toInt32(args[1]);
     81         optionalHeight = &height;
     82     }
     83 
     84     RefPtr<HTMLImageElement> image = HTMLImageElement::createForJSConstructor(document, optionalWidth, optionalHeight);
     85     V8DOMWrapper::setDOMWrapper(args.Holder(), &V8HTMLImageElementConstructor::info, image.get());
     86     image->ref();
     87     V8DOMWrapper::setJSWrapperForDOMNode(image.get(), v8::Persistent<v8::Object>::New(args.Holder()));
     88     return args.Holder();
     89 }
     90 
     91 v8::Persistent<v8::FunctionTemplate> V8HTMLImageElementConstructor::GetTemplate()
     92 {
     93     static v8::Persistent<v8::FunctionTemplate> cachedTemplate;
     94     if (!cachedTemplate.IsEmpty())
     95         return cachedTemplate;
     96 
     97     v8::HandleScope scope;
     98     v8::Local<v8::FunctionTemplate> result = v8::FunctionTemplate::New(v8HTMLImageElementConstructorCallback);
     99 
    100     v8::Local<v8::ObjectTemplate> instance = result->InstanceTemplate();
    101     instance->SetInternalFieldCount(V8HTMLImageElement::internalFieldCount);
    102     result->SetClassName(v8::String::New("HTMLImageElement"));
    103     result->Inherit(V8HTMLImageElement::GetTemplate());
    104 
    105     cachedTemplate = v8::Persistent<v8::FunctionTemplate>::New(result);
    106     return cachedTemplate;
    107 }
    108 
    109 } // namespace WebCore
    110