Home | History | Annotate | Download | only in js 
      1 /*
      2  * Copyright (C) 2007 Apple Inc. All rights reserved.
      3  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #include "config.h"
     28 #include "JSHTMLCanvasElement.h"
     29 
     30 #include "CanvasContextAttributes.h"
     31 #include "HTMLCanvasElement.h"
     32 #include "JSCanvasRenderingContext2D.h"
     33 #if ENABLE(WEBGL)
     34 #include "JSWebGLRenderingContext.h"
     35 #include "WebGLContextAttributes.h"
     36 #endif
     37 #include <wtf/GetPtr.h>
     38 
     39 using namespace JSC;
     40 
     41 namespace WebCore {
     42 
     43 void JSHTMLCanvasElement::markChildren(MarkStack& markStack)
     44 {
     45     Base::markChildren(markStack);
     46 
     47     HTMLCanvasElement* canvas = static_cast<HTMLCanvasElement*>(impl());
     48     JSGlobalData& globalData = *Heap::heap(this)->globalData();
     49 
     50     markDOMObjectWrapper(markStack, globalData, canvas->renderingContext());
     51 }
     52 
     53 JSValue JSHTMLCanvasElement::getContext(ExecState* exec)
     54 {
     55     HTMLCanvasElement* canvas = static_cast<HTMLCanvasElement*>(impl());
     56     const UString& contextId = exec->argument(0).toString(exec);
     57     RefPtr<CanvasContextAttributes> attrs;
     58 #if ENABLE(WEBGL)
     59     if (contextId == "experimental-webgl" || contextId == "webkit-3d") {
     60         attrs = WebGLContextAttributes::create();
     61         WebGLContextAttributes* webGLAttrs = static_cast<WebGLContextAttributes*>(attrs.get());
     62         if (exec->argumentCount() > 1 && exec->argument(1).isObject()) {
     63             JSObject* jsAttrs = exec->argument(1).getObject();
     64             Identifier alpha(exec, "alpha");
     65             if (jsAttrs->hasProperty(exec, alpha))
     66                 webGLAttrs->setAlpha(jsAttrs->get(exec, alpha).toBoolean(exec));
     67             Identifier depth(exec, "depth");
     68             if (jsAttrs->hasProperty(exec, depth))
     69                 webGLAttrs->setDepth(jsAttrs->get(exec, depth).toBoolean(exec));
     70             Identifier stencil(exec, "stencil");
     71             if (jsAttrs->hasProperty(exec, stencil))
     72                 webGLAttrs->setStencil(jsAttrs->get(exec, stencil).toBoolean(exec));
     73             Identifier antialias(exec, "antialias");
     74             if (jsAttrs->hasProperty(exec, antialias))
     75                 webGLAttrs->setAntialias(jsAttrs->get(exec, antialias).toBoolean(exec));
     76             Identifier premultipliedAlpha(exec, "premultipliedAlpha");
     77             if (jsAttrs->hasProperty(exec, premultipliedAlpha))
     78                 webGLAttrs->setPremultipliedAlpha(jsAttrs->get(exec, premultipliedAlpha).toBoolean(exec));
     79             Identifier preserveDrawingBuffer(exec, "preserveDrawingBuffer");
     80             if (jsAttrs->hasProperty(exec, preserveDrawingBuffer))
     81                 webGLAttrs->setPreserveDrawingBuffer(jsAttrs->get(exec, preserveDrawingBuffer).toBoolean(exec));
     82         }
     83     }
     84 #endif
     85     CanvasRenderingContext* context = canvas->getContext(ustringToString(contextId), attrs.get());
     86     if (!context)
     87         return jsNull();
     88     return toJS(exec, globalObject(), WTF::getPtr(context));
     89 }
     90 
     91 JSValue JSHTMLCanvasElement::toDataURL(ExecState* exec)
     92 {
     93     const String& type = valueToStringWithUndefinedOrNullCheck(exec, exec->argument(0));
     94     HTMLCanvasElement* canvas = static_cast<HTMLCanvasElement*>(impl());
     95     ExceptionCode ec = 0;
     96 
     97     JSC::JSValue result;
     98     double quality;
     99     double* qualityPtr = 0;
    100     if (exec->argumentCount() > 1) {
    101         JSValue v = exec->argument(1);
    102         if (v.isNumber()) {
    103             quality = v.toNumber(exec);
    104             qualityPtr = &quality;
    105         }
    106     }
    107 
    108     result = jsString(exec, canvas->toDataURL(type, qualityPtr, ec));
    109     setDOMException(exec, ec);
    110     return result;
    111 }
    112 
    113 } // namespace WebCore
    114