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      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 #include "config.h"
     27 
     28 #if ENABLE(3D_CANVAS)
     29 
     30 #include "WebGLArrayBuffer.h"
     31 #include "WebGLShortArray.h"
     32 
     33 namespace WebCore {
     34 
     35 PassRefPtr<WebGLShortArray> WebGLShortArray::create(unsigned length)
     36 {
     37     RefPtr<WebGLArrayBuffer> buffer = WebGLArrayBuffer::create(length * sizeof(short));
     38     return create(buffer, 0, length);
     39 }
     40 
     41 PassRefPtr<WebGLShortArray> WebGLShortArray::create(short* array, unsigned length)
     42 {
     43     RefPtr<WebGLShortArray> a = WebGLShortArray::create(length);
     44     for (unsigned i = 0; i < length; ++i)
     45         a->set(i, array[i]);
     46     return a;
     47 }
     48 
     49 PassRefPtr<WebGLShortArray> WebGLShortArray::create(PassRefPtr<WebGLArrayBuffer> buffer,
     50                                                     int byteOffset,
     51                                                     unsigned length)
     52 {
     53     // Make sure the offset results in valid alignment.
     54     if ((byteOffset % sizeof(short)) != 0)
     55         return NULL;
     56 
     57     if (buffer) {
     58         // Check to make sure we are talking about a valid region of
     59         // the given WebGLArrayBuffer's storage.
     60         if ((byteOffset + (length * sizeof(short))) > buffer->byteLength())
     61             return NULL;
     62     }
     63 
     64     return adoptRef(new WebGLShortArray(buffer, byteOffset, length));
     65 }
     66 
     67 WebGLShortArray::WebGLShortArray(PassRefPtr<WebGLArrayBuffer> buffer, int byteOffset, unsigned length)
     68         : WebGLArray(buffer, byteOffset)
     69         , m_size(length)
     70 {
     71 }
     72 
     73 unsigned WebGLShortArray::length() const {
     74     return m_size;
     75 }
     76 
     77 unsigned WebGLShortArray::byteLength() const {
     78     return m_size * sizeof(short);
     79 }
     80 
     81 PassRefPtr<WebGLArray> WebGLShortArray::slice(unsigned offset, unsigned length) {
     82     // Check to make sure the specified region is within the bounds of
     83     // the WebGLArrayBuffer.
     84     unsigned startByte = m_byteOffset + offset * sizeof(short);
     85     unsigned limitByte = startByte + length * sizeof(short);
     86     unsigned bufferLength = buffer()->byteLength();
     87     if (startByte >= bufferLength || limitByte > bufferLength)
     88         return 0;
     89     return create(buffer(), startByte, length);
     90 }
     91 
     92 void WebGLShortArray::set(WebGLShortArray* array, unsigned offset, ExceptionCode& ec) {
     93     setImpl(array, offset * sizeof(short), ec);
     94 }
     95 
     96 }
     97 
     98 #endif // ENABLE(3D_CANVAS)
     99