/platform/external/webkit/WebCore/bindings/js/JSWebGLArrayBufferConstructor.h

 1/*
 2 * Copyright (C) 2009 Apple 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
 6 * are met:
 7 * 1. Redistributions of source code must retain the above copyright
 8 *    notice, this list of conditions and the following disclaimer.
 9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
24 */
25
26#ifndef JSWebGLArrayBufferConstructor_h
27#define JSWebGLArrayBufferConstructor_h
28
29#include "JSDOMBinding.h"
30#include "JSDocument.h"
31#include "JSWebGLArrayBuffer.h"
32#include <runtime/Error.h>
33
34namespace WebCore {
35
36    class WebGLArray;
37
38    // Template function used by CanvasXXXArrayConstructors
39    template<class C, typename T>
40    PassRefPtr<WebGLArray> construct(JSC::ExecState* exec, const JSC::ArgList& args)
41    {
42        // There are 3 constructors:
43        //
44        //  1) (in int size)
45        //  2) (in WebGLArrayBuffer buffer, [Optional] in int offset, [Optional] in unsigned int length)
46        //  3) (in sequence<T>) - This ends up being a JS "array-like" object
47        //
48        RefPtr<C> arrayObject;
49        
50        // For the 0 args case, just create an object without a buffer 
51        if (args.size() < 1)
52            return C::create(0, 0, 0);
53        
54        if (args.at(0).isObject()) {
55            RefPtr<WebGLArrayBuffer> buffer = toWebGLArrayBuffer(args.at(0));
56            if (buffer) {
57                int offset = (args.size() > 1) ? args.at(1).toInt32(exec) : 0;
58                unsigned int length = (args.size() > 2) ? static_cast<unsigned int>(args.at(2).toInt32(exec)) : 0;
59                return C::create(buffer, offset, length);
60            }
61            
62            JSC::JSObject* array = asObject(args.at(0));
63            int length = array->get(exec, JSC::Identifier(exec, "length")).toInt32(exec);
64            void* tempValues;
65            if (!tryFastMalloc(length * sizeof(T)).getValue(tempValues)) {
66                throwError(exec, JSC::GeneralError);
67                return 0;
68            }
69            
70            OwnFastMallocPtr<T> values(static_cast<T*>(tempValues));
71            for (int i = 0; i < length; ++i) {
72                JSC::JSValue v = array->get(exec, i);
73                if (exec->hadException())
74                    return 0;
75                values.get()[i] = static_cast<T>(v.toNumber(exec));
76            }
77            
78            return C::create(values.get(), length);
79        }
80        
81        unsigned size = static_cast<unsigned>(args.at(0).toInt32(exec));
82        return C::create(size);
83    }
84
85    class JSWebGLArrayBufferConstructor : public DOMConstructorObject {
86    public:
87        JSWebGLArrayBufferConstructor(JSC::ExecState*, JSDOMGlobalObject*);
88        static const JSC::ClassInfo s_info;
89
90    private:
91        virtual JSC::ConstructType getConstructData(JSC::ConstructData&);
92        virtual const JSC::ClassInfo* classInfo() const { return &s_info; }
93    };
94
95}
96
97#endif // JSWebGLArrayBufferConstructor_h