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      1 /*
      2  * Copyright (C) 2010 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 INC. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "UpdateChunk.h"
     28 
     29 #include "ArgumentDecoder.h"
     30 #include "ArgumentEncoder.h"
     31 #include "WebCoreArgumentCoders.h"
     32 
     33 using namespace WebCore;
     34 
     35 namespace WebKit {
     36 
     37 UpdateChunk::UpdateChunk()
     38     : m_bitmapSharedMemory(0)
     39 {
     40 }
     41 
     42 UpdateChunk::UpdateChunk(const IntRect& rect)
     43     : m_rect(rect)
     44 {
     45     // Create our shared memory mapping.
     46     unsigned memorySize = rect.height() * rect.width() * 4;
     47     m_bitmapSharedMemory = ::CreateFileMapping(INVALID_HANDLE_VALUE, 0, PAGE_READWRITE, 0, memorySize, 0);
     48 }
     49 
     50 UpdateChunk::UpdateChunk(const IntRect& rect, HANDLE bitmapSharedMemory)
     51     : m_rect(rect)
     52     , m_bitmapSharedMemory(bitmapSharedMemory)
     53 {
     54 }
     55 
     56 void UpdateChunk::encode(CoreIPC::ArgumentEncoder* encoder) const
     57 {
     58     encoder->encode(m_rect);
     59     encoder->encode(reinterpret_cast<uintptr_t>(m_bitmapSharedMemory));
     60 }
     61 
     62 bool UpdateChunk::decode(CoreIPC::ArgumentDecoder* decoder, UpdateChunk& updateChunk)
     63 {
     64     IntRect rect;
     65     if (!decoder->decode(rect))
     66         return false;
     67     updateChunk.m_rect = rect;
     68 
     69     uintptr_t bitmapSharedMmemory;
     70     if (!decoder->decode(bitmapSharedMmemory))
     71         return false;
     72 
     73     updateChunk.m_bitmapSharedMemory = reinterpret_cast<HANDLE>(bitmapSharedMmemory);
     74     return true;
     75 }
     76 
     77 } // namespace WebKit
     78