PassOwnPtr<GraphicsContext> UpdateAtlas::beginPaintingOnAvailableBuffer(uint32_t& atlasID, const IntSize& size, IntPoint& offset)
{
m_inactivityInSeconds = 0;
buildLayoutIfNeeded();
IntRect rect = m_areaAllocator->allocate(size);
// No available buffer was found, returning null.
if (rect.isEmpty())
return PassOwnPtr<GraphicsContext>();
if (!m_surface)
return PassOwnPtr<GraphicsContext>();
atlasID = m_ID;
// FIXME: Use tri-state buffers, to allow faster updates.
offset = rect.location();
OwnPtr<GraphicsContext> graphicsContext = m_surface->createGraphicsContext(rect);
if (supportsAlpha()) {
graphicsContext->setCompositeOperation(CompositeCopy);
graphicsContext->fillRect(IntRect(IntPoint::zero(), size), Color::transparent, ColorSpaceDeviceRGB);
graphicsContext->setCompositeOperation(CompositeSourceOver);
}
return graphicsContext.release();
}
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;
}
