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/*
* Copyright (C) 2011, 2012, 2013 Research In Motion Limited. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#if USE(ACCELERATED_COMPOSITING)
#include "LayerTile.h"
#include "TextureCacheCompositingThread.h"
namespace WebCore {
LayerTile::LayerTile()
: m_scale(0)
, m_contentsDirty(false)
, m_visible(false)
{
}
LayerTile::~LayerTile()
{
// Make sure to unprotect the texture if needed.
setVisible(false);
}
void LayerTile::setContents(BlackBerry::Platform::Graphics::Buffer* contents)
{
m_scale = 0; // Resolution independent
setTexture(textureCacheCompositingThread()->textureForContents(contents));
}
void LayerTile::updateContents(BlackBerry::Platform::Graphics::Buffer* contents, double scale)
{
m_scale = scale;
setTexture(textureCacheCompositingThread()->updateContents(m_texture, contents));
}
void LayerTile::discardContents()
{
m_scale = 0; // Unknown scale
setTexture(0);
}
void LayerTile::setVisible(bool visible)
{
if (visible == m_visible)
return;
m_visible = visible;
if (!m_texture)
return;
// Protect the texture from being evicted from cache
// if we are visible.
if (visible)
m_texture->protect();
else
m_texture->unprotect();
}
void LayerTile::setTexture(PassRefPtr<LayerTexture> texture)
{
// Clear this flag regardless of the value of the texture parameter.
// If it's 0, isDirty() will return true anyway.
// If it's the same texture, perhaps there was no more detailed texture
// available than the one we already had, and keeping the dirty flag will
// result in an endless loop of updating to the same texture.
m_contentsDirty = false;
if (texture == m_texture)
return;
// Move protection over to the new texture.
if (m_visible) {
if (m_texture)
m_texture->unprotect();
if (texture)
texture->protect();
}
m_texture = texture;
}
} // namespace WebCore
#endif // USE(ACCELERATED_COMPOSITING)
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