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/*
Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies)
Copyright (C) 2012 Company 100, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "UpdateAtlas.h"
#if USE(COORDINATED_GRAPHICS)
#include <WebCore/CoordinatedGraphicsState.h>
#include <WebCore/GraphicsContext.h>
#include <WebCore/IntRect.h>
#include <wtf/MathExtras.h>
using namespace WebCore;
namespace WebKit {
class UpdateAtlasSurfaceClient final : public CoordinatedSurface::Client {
public:
UpdateAtlasSurfaceClient(CoordinatedSurface::Client& client, const IntSize& size, bool supportsAlpha)
: m_client(client)
, m_size(size)
, m_supportsAlpha(supportsAlpha)
{
}
void paintToSurfaceContext(GraphicsContext& context) override
{
if (m_supportsAlpha) {
context.setCompositeOperation(CompositeCopy);
context.fillRect(IntRect(IntPoint::zero(), m_size), Color::transparent);
context.setCompositeOperation(CompositeSourceOver);
}
m_client.paintToSurfaceContext(context);
}
private:
CoordinatedSurface::Client& m_client;
IntSize m_size;
bool m_supportsAlpha;
};
UpdateAtlas::UpdateAtlas(Client& client, int dimension, CoordinatedSurface::Flags flags)
: m_client(client)
{
static uint32_t nextID = 0;
m_ID = ++nextID;
IntSize size = nextPowerOfTwo(IntSize(dimension, dimension));
m_surface = CoordinatedSurface::create(size, flags);
m_client.createUpdateAtlas(m_ID, m_surface.copyRef());
}
UpdateAtlas::~UpdateAtlas()
{
if (m_surface)
m_client.removeUpdateAtlas(m_ID);
}
void UpdateAtlas::buildLayoutIfNeeded()
{
if (m_areaAllocator)
return;
m_areaAllocator = std::make_unique<GeneralAreaAllocator>(size());
m_areaAllocator->setMinimumAllocation(IntSize(32, 32));
}
void UpdateAtlas::didSwapBuffers()
{
m_areaAllocator = nullptr;
}
bool UpdateAtlas::paintOnAvailableBuffer(const IntSize& size, uint32_t& atlasID, IntPoint& offset, CoordinatedSurface::Client& client)
{
m_inactivityInSeconds = 0;
buildLayoutIfNeeded();
IntRect rect = m_areaAllocator->allocate(size);
// No available buffer was found.
if (rect.isEmpty())
return false;
if (!m_surface)
return false;
atlasID = m_ID;
// FIXME: Use tri-state buffers, to allow faster updates.
offset = rect.location();
UpdateAtlasSurfaceClient surfaceClient(client, size, supportsAlpha());
m_surface->paintToSurface(rect, surfaceClient);
return true;
}
} // namespace WebCore
#endif // USE(COORDINATED_GRAPHICS)
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