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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 "Attachment.h"
     32 #include "WebCoreArgumentCoders.h"
     33 #include <WebCore/FloatRect.h>
     34 #include <mach/vm_map.h>
     35 #include <wtf/RetainPtr.h>
     36 
     37 using namespace WebCore;
     38 
     39 namespace WebKit {
     40 
     41 UpdateChunk::UpdateChunk()
     42     : m_data(0)
     43     , m_size(0)
     44 {
     45 }
     46 
     47 UpdateChunk::UpdateChunk(const IntRect& rect)
     48     : m_rect(rect)
     49     , m_size(size())
     50 {
     51     vm_allocate(mach_task_self(), reinterpret_cast<vm_address_t*>(&m_data), m_size, VM_FLAGS_ANYWHERE);
     52 }
     53 
     54 UpdateChunk::~UpdateChunk()
     55 {
     56     if (m_data)
     57         vm_deallocate(mach_task_self(), reinterpret_cast<vm_address_t>(m_data), m_size);
     58 }
     59 
     60 RetainPtr<CGImageRef> UpdateChunk::createImage()
     61 {
     62     RetainPtr<CGDataProviderRef> provider(AdoptCF, CGDataProviderCreateWithData(0, m_data, size(), 0));
     63     RetainPtr<CGColorSpaceRef> colorSpace(AdoptCF, CGColorSpaceCreateDeviceRGB());
     64     RetainPtr<CGImageRef> image(AdoptCF, CGImageCreate(m_rect.width(), m_rect.height(), 8, 32, m_rect.width() * 4, colorSpace.get(), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host, provider.get(), 0, false, kCGRenderingIntentDefault));
     65 
     66     return image;
     67 }
     68 
     69 void UpdateChunk::encode(CoreIPC::ArgumentEncoder* encoder) const
     70 {
     71     encoder->encode(m_rect);
     72     encoder->encode(CoreIPC::Attachment(m_data, size(), MACH_MSG_VIRTUAL_COPY, true));
     73 
     74     m_data = 0;
     75 }
     76 
     77 bool UpdateChunk::decode(CoreIPC::ArgumentDecoder* decoder, UpdateChunk& chunk)
     78 {
     79     IntRect rect;
     80     if (!decoder->decode(rect))
     81         return false;
     82     chunk.m_rect = rect;
     83 
     84     CoreIPC::Attachment attachment;
     85     if (!decoder->decode(attachment))
     86         return false;
     87 
     88     chunk.m_size = attachment.size();
     89     chunk.m_data = reinterpret_cast<uint8_t*>(attachment.address());
     90     return true;
     91 }
     92 
     93 } // namespace WebKit
     94