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 "UpdateChunk.h"

    27 

    28 #include "ArgumentDecoder.h"

    29 #include "ArgumentEncoder.h"

    30 #include "WebCoreArgumentCoders.h"

    31 

    32 using namespace WebCore;

    33 

    34 namespace WebKit {

    35 

    36 UpdateChunk::UpdateChunk()

    37     : m_bitmapSharedMemory(0)

    38 {

    39 }

    40 

    41 UpdateChunk::UpdateChunk(const IntRect& rect)

    42     : m_rect(rect)

    43 {

    44     // Create our shared memory mapping.

    45     unsigned memorySize = rect.height() * rect.width() * 4;

    46     m_bitmapSharedMemory = ::CreateFileMapping(INVALID_HANDLE_VALUE, 0, PAGE_READWRITE, 0, memorySize, 0);

    47 }

    48 

    49 UpdateChunk::UpdateChunk(const IntRect& rect, HANDLE bitmapSharedMemory)

    50     : m_rect(rect)

    51     , m_bitmapSharedMemory(bitmapSharedMemory)

    52 {

    53 }

    54 

    55 void UpdateChunk::encode(CoreIPC::ArgumentEncoder& encoder) const

    56 {

    57     encoder.encode(m_rect);

    58     encoder.encode(reinterpret_cast<uintptr_t>(m_bitmapSharedMemory));

    59 }

    60 

    61 bool UpdateChunk::decode(CoreIPC::ArgumentDecoder& decoder, UpdateChunk& updateChunk)

    62 {

    63     IntRect rect;

    64     if (!decoder.decode(rect))

    65         return false;

    66     updateChunk.m_rect = rect;

    67 

    68     uintptr_t bitmapSharedMmemory;

    69     if (!decoder.decode(bitmapSharedMmemory))

    70         return false;

    71 

    72     updateChunk.m_bitmapSharedMemory = reinterpret_cast<HANDLE>(bitmapSharedMmemory);

    73     return true;

    74 }

    75 

    76 } // namespace WebKit