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