/platform/external/webkit/WebCore/bindings/v8/custom/V8WebGLArrayCustom.h

  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
 43// Template function used by the WebGLArray*Constructor callbacks.
 44template<class ArrayClass>
 45v8::Handle<v8::Value> constructWebGLArray(const v8::Arguments& args,
 46                                          int classIndex)
 47{
 48    if (!args.IsConstructCall())
 49        return throwError("DOM object constructor cannot be called as a function.");
 50
 51    int argLen = args.Length();
 52    if (argLen == 0) {
 53        // This happens when we return a previously constructed
 54        // WebGLArray, e.g. from the call to WebGL<T>Array.slice().
 55        // The V8DOMWrapper will set the internal pointer in the
 56        // created object. Unfortunately it doesn't look like it's
 57        // possible to distinguish between this case and that where
 58        // the user calls "new WebGL<T>Array()" from JavaScript.
 59        return args.Holder();
 60    }
 61
 62    // Supported constructors:
 63    // WebGL<T>Array(n) where n is an integer:
 64    //   -- create an empty array of n elements
 65    // WebGL<T>Array(arr) where arr is an array:
 66    //   -- create a WebGL<T>Array containing the contents of "arr"
 67    // WebGL<T>Array(buf, offset, length)
 68    //   -- create a WebGL<T>Array pointing to the WebGLArrayBuffer
 69    //      "buf", starting at the specified offset, for the given
 70    //      length
 71
 72    // See whether the first argument is a WebGLArrayBuffer.
 73    if (V8WebGLArrayBuffer::HasInstance(args[0])) {
 74        if (argLen > 3)
 75            return throwError("Wrong number of arguments to new WebGL<T>Array(WebGLArrayBuffer, int, int)");
 76
 77        WebGLArrayBuffer* buf = V8WebGLArrayBuffer::toNative(args[0]->ToObject());
 78        if (buf == NULL)
 79            return throwError("Could not convert argument 0 to a WebGLArrayBuffer");
 80        bool ok;
 81        int offset = 0;
 82        if (argLen > 1) {
 83            offset = toInt32(args[1], ok);
 84            if (!ok)
 85                return throwError("Could not convert argument 1 to an integer");
 86        }
 87        int length = buf->byteLength() - offset;
 88        if (argLen > 2) {
 89            length = toInt32(args[2], ok);
 90            if (!ok)
 91                return throwError("Could not convert argument 2 to an integer");
 92        }
 93        if (length < 0)
 94            return throwError("Length / offset out of range");
 95
 96        RefPtr<ArrayClass> array = ArrayClass::create(buf, offset, length);
 97        if (array == NULL)
 98            return throwError("Invalid arguments to new WebGL<T>Array(WebGLArrayBuffer, int, int)");
 99        // Transform the holder into a wrapper object for the array.
100        V8DOMWrapper::setDOMWrapper(args.Holder(), classIndex, array.get());
101        V8DOMWrapper::setIndexedPropertiesToExternalArray(args.Holder(),
102                                                          classIndex,
103                                                          array.get()->baseAddress(),
104                                                          array.get()->length());
105        return toV8(array.release(), args.Holder());
106    }
107
108    int len = 0;
109    v8::Handle<v8::Object> srcArray;
110    if (argLen != 1)
111        return throwError("Wrong number of arguments to new WebGL<T>Array(int / array)");
112
113    if (args[0]->IsInt32()) {
114        len = toInt32(args[0]);
115    } else if (args[0]->IsObject()) {
116        srcArray = args[0]->ToObject();
117        if (srcArray.IsEmpty())
118            return throwError("Could not convert argument 0 to an object");
119        len = toInt32(srcArray->Get(v8::String::New("length")));
120    } else
121        return throwError("Could not convert argument 0 to either an int32 or an object");
122
123    RefPtr<ArrayClass> array = ArrayClass::create(len);
124    if (!srcArray.IsEmpty()) {
125        // Need to copy the incoming array into the newly created WebGLArray.
126        for (int i = 0; i < len; i++) {
127            v8::Local<v8::Value> val = srcArray->Get(v8::Integer::New(i));
128            array->set(i, val->NumberValue());
129        }
130    }
131
132    // Transform the holder into a wrapper object for the array.
133    V8DOMWrapper::setDOMWrapper(args.Holder(), classIndex, array.get());
134    V8DOMWrapper::setIndexedPropertiesToExternalArray(args.Holder(),
135                                                      classIndex,
136                                                      array.get()->baseAddress(),
137                                                      array.get()->length());
138    return toV8(array.release(), args.Holder());
139}
140
141template <class T, typename ElementType>
142v8::Handle<v8::Value> getWebGLArrayElement(const v8::Arguments& args,
143                                           V8ClassIndex::V8WrapperType wrapperType)
144{
145    if (args.Length() != 1) {
146        V8Proxy::setDOMException(SYNTAX_ERR);
147        return notHandledByInterceptor();
148    }
149    bool ok;
150    uint32_t index = toInt32(args[0], ok);
151    if (!ok) {
152        V8Proxy::setDOMException(SYNTAX_ERR);
153        return notHandledByInterceptor();
154    }
155    T* array = reinterpret_cast<T*>(args.Holder()->GetPointerFromInternalField(v8DOMWrapperObjectIndex));
156    if (index >= array->length())
157        return v8::Undefined();
158    ElementType result;
159    if (!array->get(index, result))
160        return v8::Undefined();
161    return v8::Number::New(result);
162}
163
164template <class T>
165v8::Handle<v8::Value> setWebGLArrayFromArray(T* webGLArray, const v8::Arguments& args)
166{
167    if (args[0]->IsObject()) {
168        // void set(in sequence<long> array, [Optional] in unsigned long offset);
169        v8::Local<v8::Object> array = args[0]->ToObject();
170        uint32_t offset = 0;
171        if (args.Length() == 2)
172            offset = toInt32(args[1]);
173        uint32_t length = toInt32(array->Get(v8::String::New("length")));
174        if (offset + length > webGLArray->length())
175            V8Proxy::setDOMException(INDEX_SIZE_ERR);
176        else
177            for (uint32_t i = 0; i < length; i++)
178                webGLArray->set(offset + i, array->Get(v8::Integer::New(i))->NumberValue());
179    }
180
181    return v8::Undefined();
182}
183
184template <class CPlusPlusArrayType, class JavaScriptWrapperArrayType>
185v8::Handle<v8::Value> setWebGLArray(const v8::Arguments& args,
186                                    V8ClassIndex::V8WrapperType wrapperType)
187{
188    if (args.Length() < 1 || args.Length() > 2) {
189        V8Proxy::setDOMException(SYNTAX_ERR);
190        return notHandledByInterceptor();
191    }
192
193    CPlusPlusArrayType* array = JavaScriptWrapperArrayType::toNative(args.Holder());
194
195    if (args.Length() == 2 && args[0]->IsInt32()) {
196        // void set(in unsigned long index, in {long|float} value);
197        uint32_t index = toInt32(args[0]);
198        array->set(index, args[1]->NumberValue());
199        return v8::Undefined();
200    }
201
202    if (JavaScriptWrapperArrayType::HasInstance(args[0])) {
203        // void set(in WebGL<T>Array array, [Optional] in unsigned long offset);
204        CPlusPlusArrayType* src = JavaScriptWrapperArrayType::toNative(args[0]->ToObject());
205        uint32_t offset = 0;
206        if (args.Length() == 2)
207            offset = toInt32(args[1]);
208        ExceptionCode ec = 0;
209        array->set(src, offset, ec);
210        V8Proxy::setDOMException(ec);
211        return v8::Undefined();
212    }
213
214    return setWebGLArrayFromArray(array, args);
215}
216
217}
218
219#endif // ENABLE(3D_CANVAS)