IntRect ContentLayerChromium::visibleLayerRect(const IntRect& targetSurfaceRect)
{
if (targetSurfaceRect.isEmpty())
return targetSurfaceRect;
const IntRect layerBoundRect = layerBounds();
const TransformationMatrix transform = tilingTransform();
// Is this layer fully contained within the target surface?
IntRect layerInSurfaceSpace = transform.mapRect(layerBoundRect);
if (targetSurfaceRect.contains(layerInSurfaceSpace))
return layerBoundRect;
// If the layer doesn't fill up the entire surface, then find the part of
// the surface rect where the layer could be visible. This avoids trying to
// project surface rect points that are behind the projection point.
IntRect minimalSurfaceRect = targetSurfaceRect;
minimalSurfaceRect.intersect(layerInSurfaceSpace);
// Project the corners of the target surface rect into the layer space.
// This bounding rectangle may be larger than it needs to be (being
// axis-aligned), but is a reasonable filter on the space to consider.
// Non-invertible transforms will create an empty rect here.
const TransformationMatrix surfaceToLayer = transform.inverse();
IntRect layerRect = surfaceToLayer.projectQuad(FloatQuad(FloatRect(minimalSurfaceRect))).enclosingBoundingBox();
layerRect.intersect(layerBoundRect);
return layerRect;
}
void ContentLayerChromium::draw(const IntRect& targetSurfaceRect)
{
const TransformationMatrix transform = tilingTransform();
IntRect layerRect = visibleLayerRect(targetSurfaceRect);
if (!layerRect.isEmpty())
m_tiler->draw(layerRect, transform, ccLayerImpl()->drawOpacity());
}
void TiledLayerChromium::pushPropertiesTo(CCLayerImpl* layer)
{
LayerChromium::pushPropertiesTo(layer);
CCTiledLayerImpl* tiledLayer = static_cast<CCTiledLayerImpl*>(layer);
if (!m_tiler) {
tiledLayer->setSkipsDraw(true);
return;
}
tiledLayer->setTilingTransform(tilingTransform());
tiledLayer->setSkipsDraw(m_skipsDraw);
tiledLayer->setTextureOrientation(m_textureOrientation);
tiledLayer->setSampledTexelFormat(m_sampledTexelFormat);
tiledLayer->setTilingData(*m_tiler);
for (CCLayerTilingData::TileMap::const_iterator iter = m_tiler->tiles().begin(); iter != m_tiler->tiles().end(); ++iter) {
int i = iter->first.first;
int j = iter->first.second;
UpdatableTile* tile = static_cast<UpdatableTile*>(iter->second.get());
if (!tile->texture()->isValid(m_tiler->tileSize(), m_textureFormat))
continue;
tiledLayer->syncTextureId(i, j, tile->texture()->textureId());
}
}