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
39using namespace JSC;
40
41namespace WebCore {
42
43void 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
53JSValue 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
91JSValue 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