void TiledLayerChromium::prepareToUpdateIdle(const IntRect& layerRect, const CCOcclusionTracker* occlusion)
{
// Abort if we have already prepared a paint or run out of memory.
if (m_skipsIdlePaint || !m_paintRect.isEmpty())
return;
ASSERT(m_tiler);
updateBounds();
if (m_tiler->isEmpty())
return;
// Protect any textures in the pre-paint area so we don't end up just
// reclaiming them below.
IntRect idlePaintLayerRect = idlePaintRect(layerRect);
protectTileTextures(idlePaintLayerRect);
int left, top, right, bottom;
m_tiler->layerRectToTileIndices(layerRect, left, top, right, bottom);
// Prepaint anything that was occluded but inside the layer's visible region.
prepareToUpdateTiles(true, left, top, right, bottom, 0);
if (!m_paintRect.isEmpty() || m_skipsIdlePaint)
return;
// Expand outwards until we find a dirty row or column to update.
int prepaintLeft, prepaintTop, prepaintRight, prepaintBottom;
m_tiler->layerRectToTileIndices(idlePaintLayerRect, prepaintLeft, prepaintTop, prepaintRight, prepaintBottom);
while (!m_skipsIdlePaint && (left > prepaintLeft || top > prepaintTop || right < prepaintRight || bottom < prepaintBottom)) {
if (bottom < prepaintBottom) {
++bottom;
prepareToUpdateTiles(true, left, bottom, right, bottom, 0);
if (!m_paintRect.isEmpty() || m_skipsIdlePaint)
break;
}
if (top > prepaintTop) {
--top;
prepareToUpdateTiles(true, left, top, right, top, 0);
if (!m_paintRect.isEmpty() || m_skipsIdlePaint)
break;
}
if (left > prepaintLeft) {
--left;
prepareToUpdateTiles(true, left, top, left, bottom, 0);
if (!m_paintRect.isEmpty() || m_skipsIdlePaint)
break;
}
if (right < prepaintRight) {
++right;
prepareToUpdateTiles(true, right, top, right, bottom, 0);
if (!m_paintRect.isEmpty() || m_skipsIdlePaint)
break;
}
}
}
void TiledLayerChromium::protectVisibleTileTextures()
{
protectTileTextures(visibleLayerRect());
}
void TiledLayerChromium::protectVisibleTileTextures()
{
protectTileTextures(IntRect(IntPoint::zero(), contentBounds()));
}
