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      1 /*
      2  * Copyright (C) 2009 Apple Inc. All rights reserved.
      3  * Copyright (C) 2009 Google Inc. 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 
     29 #if ENABLE(3D_CANVAS)
     30 
     31 #include "WebGLArrayBuffer.h"
     32 #include "WebGLIntArray.h"
     33 
     34 namespace WebCore {
     35 
     36 PassRefPtr<WebGLIntArray> WebGLIntArray::create(unsigned length)
     37 {
     38     RefPtr<WebGLArrayBuffer> buffer = WebGLArrayBuffer::create(length * sizeof(int));
     39     return create(buffer, 0, length);
     40 }
     41 
     42 PassRefPtr<WebGLIntArray> WebGLIntArray::create(int* array, unsigned length)
     43 {
     44     RefPtr<WebGLIntArray> a = WebGLIntArray::create(length);
     45     for (unsigned i = 0; i < length; ++i)
     46         a->set(i, array[i]);
     47     return a;
     48 }
     49 
     50 PassRefPtr<WebGLIntArray> WebGLIntArray::create(PassRefPtr<WebGLArrayBuffer> buffer,
     51                                                 int byteOffset,
     52                                                 unsigned length)
     53 {
     54     // Make sure the offset results in valid alignment.
     55     if ((byteOffset % sizeof(int)) != 0)
     56         return NULL;
     57 
     58     if (buffer) {
     59         // Check to make sure we are talking about a valid region of
     60         // the given WebGLArrayBuffer's storage.
     61         if ((byteOffset + (length * sizeof(int))) > buffer->byteLength())
     62             return NULL;
     63     }
     64 
     65     return adoptRef(new WebGLIntArray(buffer, byteOffset, length));
     66 }
     67 
     68 WebGLIntArray::WebGLIntArray(PassRefPtr<WebGLArrayBuffer> buffer, int byteOffset, unsigned length)
     69         : WebGLArray(buffer, byteOffset)
     70         , m_size(length)
     71 {
     72 }
     73 
     74 unsigned WebGLIntArray::length() const {
     75     return m_size;
     76 }
     77 
     78 unsigned WebGLIntArray::byteLength() const {
     79     return m_size * sizeof(int);
     80 }
     81 
     82 PassRefPtr<WebGLArray> WebGLIntArray::slice(unsigned offset, unsigned length) {
     83     // Check to make sure the specified region is within the bounds of
     84     // the WebGLArrayBuffer.
     85     unsigned startByte = m_byteOffset + offset * sizeof(int);
     86     unsigned limitByte = startByte + length * sizeof(int);
     87     unsigned bufferLength = buffer()->byteLength();
     88     if (startByte >= bufferLength || limitByte > bufferLength)
     89         return 0;
     90     return create(buffer(), startByte, length);
     91 }
     92 
     93 void WebGLIntArray::set(WebGLIntArray* array, unsigned offset, ExceptionCode& ec) {
     94     setImpl(array, offset * sizeof(int), ec);
     95 }
     96 
     97 }
     98 
     99 #endif // ENABLE(3D_CANVAS)
    100