Source/WebKit/blackberry/WebKitSupport/BackingStoreCompositingSurface.cpp

   1 /*
   2  * Copyright (C) 2009, 2010, 2011, 2012 Research In Motion Limited. All rights reserved.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 #include "config.h"
  20 #include "BackingStoreCompositingSurface.h"
  21
  22 #include "GraphicsContext.h"
  23 #include "SurfacePool.h"
  24
  25 #if USE(ACCELERATED_COMPOSITING)
  26
  27 #include <BlackBerryPlatformGraphics.h>
  28
  29 namespace BlackBerry {
  30 namespace WebKit {
  31
  32 CompositingSurfaceBuffer::CompositingSurfaceBuffer(const Platform::IntSize& size)
  33     : m_size(size)
  34     , m_buffer(0)
  35 {
  36 }
  37
  38 CompositingSurfaceBuffer::~CompositingSurfaceBuffer()
  39 {
  40     destroyBuffer(m_buffer);
  41 }
  42
  43 Platform::IntSize CompositingSurfaceBuffer::surfaceSize() const
  44 {
  45     return m_size;
  46 }
  47
  48 Platform::Graphics::Buffer* CompositingSurfaceBuffer::nativeBuffer() const
  49 {
  50     if (!m_buffer) {
  51         m_buffer = createBuffer(m_size,
  52                                 Platform::Graphics::TileBuffer,
  53                                 Platform::Graphics::GLES2);
  54     }
  55     return m_buffer;
  56 }
  57
  58 BackingStoreCompositingSurface::BackingStoreCompositingSurface(const Platform::IntSize& size, bool doubleBuffered)
  59     : m_isDoubleBuffered(doubleBuffered)
  60     , m_needsSync(true)
  61 {
  62     m_frontBuffer = new CompositingSurfaceBuffer(size);
  63     m_backBuffer = !doubleBuffered ? 0 : new CompositingSurfaceBuffer(size);
  64 }
  65
  66 BackingStoreCompositingSurface::~BackingStoreCompositingSurface()
  67 {
  68     delete m_frontBuffer;
  69     m_frontBuffer = 0;
  70
  71     delete m_backBuffer;
  72     m_backBuffer = 0;
  73 }
  74
  75 CompositingSurfaceBuffer* BackingStoreCompositingSurface::frontBuffer() const
  76 {
  77     ASSERT(m_frontBuffer);
  78     return m_frontBuffer;
  79 }
  80
  81 CompositingSurfaceBuffer* BackingStoreCompositingSurface::backBuffer() const
  82 {
  83     if (!m_isDoubleBuffered)
  84         return frontBuffer();
  85
  86     ASSERT(m_backBuffer);
  87     return m_backBuffer;
  88 }
  89
  90 void BackingStoreCompositingSurface::swapBuffers()
  91 {
  92     if (!m_isDoubleBuffered)
  93         return;
  94
  95     // Store temps.
  96     unsigned front = reinterpret_cast<unsigned>(frontBuffer());
  97     unsigned back = reinterpret_cast<unsigned>(backBuffer());
  98
  99     // Atomic change.
 100     _smp_xchg(reinterpret_cast<unsigned*>(&m_frontBuffer), back);
 101     _smp_xchg(reinterpret_cast<unsigned*>(&m_backBuffer), front);
 102 }
 103
 104 } // namespace WebKit
 105 } // namespace BlackBerry
 106 #endif // USE(ACCELERATED_COMPOSITING)