diff options
Diffstat (limited to 'WebCore/html/canvas/ArrayBufferView.cpp')
-rw-r--r-- | WebCore/html/canvas/ArrayBufferView.cpp | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/WebCore/html/canvas/ArrayBufferView.cpp b/WebCore/html/canvas/ArrayBufferView.cpp new file mode 100644 index 0000000..787fd61 --- /dev/null +++ b/WebCore/html/canvas/ArrayBufferView.cpp @@ -0,0 +1,80 @@ +/* + * Copyright (C) 2009 Apple Inc. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY + * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "config.h" + +#if ENABLE(3D_CANVAS) + +#include "ArrayBufferView.h" +#include "ArrayBuffer.h" + +namespace WebCore { + +ArrayBufferView::ArrayBufferView(PassRefPtr<ArrayBuffer> buffer, + unsigned byteOffset) + : m_byteOffset(byteOffset) + , m_buffer(buffer) +{ + m_baseAddress = m_buffer ? (static_cast<char*>(m_buffer->data()) + m_byteOffset) : 0; +} + +ArrayBufferView::~ArrayBufferView() +{ +} + +void ArrayBufferView::setImpl(ArrayBufferView* array, unsigned byteOffset, ExceptionCode& ec) +{ + if (byteOffset > byteLength() || + byteOffset + array->byteLength() > byteLength() || + byteOffset + array->byteLength() < byteOffset) { + // Out of range offset or overflow + ec = INDEX_SIZE_ERR; + return; + } + + char* base = static_cast<char*>(baseAddress()); + memmove(base + byteOffset, array->baseAddress(), array->byteLength()); +} + +void ArrayBufferView::calculateOffsetAndLength(int start, int end, unsigned arraySize, + unsigned* offset, unsigned* length) +{ + if (start < 0) + start += arraySize; + if (start < 0) + start = 0; + if (end < 0) + end += arraySize; + if (end < 0) + end = 0; + if (end < start) + end = start; + *offset = static_cast<unsigned>(start); + *length = static_cast<unsigned>(end - start); +} + +} + +#endif // ENABLE(3D_CANVAS) |