/platform/external/webkit/WebCore/bindings/v8/custom/V8WebGLArrayBufferCustom.cpp

 1/*
 2 * Copyright (C) 2009 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
33#if ENABLE(3D_CANVAS)
34
35#include "WebGLArrayBuffer.h"
36
37#include "V8Binding.h"
38#include "V8WebGLArrayBuffer.h"
39#include "V8Proxy.h"
40
41namespace WebCore {
42
43v8::Handle<v8::Value> V8WebGLArrayBuffer::constructorCallback(const v8::Arguments& args)
44{
45    INC_STATS("DOM.WebGLArrayBuffer.Constructor");
46
47    if (!args.IsConstructCall())
48        return throwError("DOM object constructor cannot be called as a function.");
49
50    // If we return a previously constructed WebGLArrayBuffer,
51    // e.g. from the call to WebGLArray.buffer, this code is called
52    // with a zero-length argument list. The V8DOMWrapper will then
53    // set the internal pointer in the newly-created object.
54    // Unfortunately it doesn't look like it's possible to distinguish
55    // between this case and that where the user calls "new
56    // WebGLArrayBuffer()" from JavaScript. To guard against problems,
57    // we always create at least a zero-length WebGLArrayBuffer, even
58    // if it is immediately overwritten by the V8DOMWrapper.
59
60    // Supported constructors:
61    // WebGLArrayBuffer(n) where n is an integer:
62    //   -- create an empty buffer of n bytes
63
64    int argLen = args.Length();
65    if (argLen > 1)
66        return throwError("Wrong number of arguments specified to constructor (requires 1)");
67
68    int len = 0;
69    if (argLen > 0) {
70        if (!args[0]->IsInt32())
71            return throwError("Argument to WebGLArrayBuffer constructor was not an integer");
72        len = toInt32(args[0]);
73    }
74
75    RefPtr<WebGLArrayBuffer> buffer = WebGLArrayBuffer::create(len);
76    // Transform the holder into a wrapper object for the array.
77    V8DOMWrapper::setDOMWrapper(args.Holder(), V8ClassIndex::ToInt(V8ClassIndex::WEBGLARRAYBUFFER), buffer.get());
78    return toV8(buffer.release(), args.Holder());
79}
80
81} // namespace WebCore
82
83#endif // ENABLE(3D_CANVAS)