C++ UpdatableTile::isDirty方法代码示例

void TiledLayerChromium::pushPropertiesTo(CCLayerImpl* layer)
{
    LayerChromium::pushPropertiesTo(layer);

    CCTiledLayerImpl* tiledLayer = static_cast<CCTiledLayerImpl*>(layer);

    tiledLayer->setSkipsDraw(m_skipsDraw);
    tiledLayer->setContentsSwizzled(m_sampledTexelFormat != LayerTextureUpdater::SampledTexelFormatRGBA);
    tiledLayer->setTilingData(*m_tiler);
    Vector<UpdatableTile*> invalidTiles;

    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->managedTexture()->isValid(m_tiler->tileSize(), m_textureFormat)) {
            invalidTiles.append(tile);
            continue;
        }
        if (tile->isDirty())
            continue;

        tiledLayer->pushTileProperties(i, j, tile->managedTexture()->textureId(), tile->m_opaqueRect);
    }
    for (Vector<UpdatableTile*>::const_iterator iter = invalidTiles.begin(); iter != invalidTiles.end(); ++iter)
        m_tiler->takeTile((*iter)->i(), (*iter)->j());
}

bool TiledLayerChromium::needsIdlePaint(const IntRect& layerRect)
{
    if (m_skipsIdlePaint)
        return false;

    IntRect idlePaintLayerRect = idlePaintRect(layerRect);

    int left, top, right, bottom;
    m_tiler->layerRectToTileIndices(idlePaintLayerRect, left, top, right, bottom);
    for (int j = top; j <= bottom; ++j) {
        for (int i = left; i <= right; ++i) {
            if (m_requestedUpdateTilesRect.contains(IntPoint(i, j)))
                continue;
            UpdatableTile* tile = tileAt(i, j);
            if (!tile || !tile->managedTexture()->isValid(m_tiler->tileSize(), m_textureFormat) || tile->isDirty())
                return true;
        }
    }
    return false;
}

void TiledLayerChromium::prepareToUpdateTiles(bool idle, int left, int top, int right, int bottom)
{
    // Reset m_updateRect for all tiles.
    for (CCLayerTilingData::TileMap::const_iterator iter = m_tiler->tiles().begin(); iter != m_tiler->tiles().end(); ++iter) {
        UpdatableTile* tile = static_cast<UpdatableTile*>(iter->second.get());
        tile->m_updateRect = IntRect();
    }

    // Create tiles as needed, expanding a dirty rect to contain all
    // the dirty regions currently being drawn. All dirty tiles that are to be painted
    // get their m_updateRect set to m_dirtyRect and m_dirtyRect cleared. This way if
    // invalidateRect is invoked during prepareToUpdate we don't lose the request.
    IntRect dirtyLayerRect;
    for (int j = top; j <= bottom; ++j) {
        for (int i = left; i <= right; ++i) {
            UpdatableTile* tile = tileAt(i, j);
            if (!tile)
                tile = createTile(i, j);

            // Do post commit deletion of current texture when partial texture
            // updates are not used.
            if (tile->isDirty() && layerTreeHost() && !layerTreeHost()->settings().partialTextureUpdates)
                layerTreeHost()->deleteTextureAfterCommit(tile->managedTexture()->steal());

            if (!tile->managedTexture()->isValid(m_tiler->tileSize(), m_textureFormat))
                tile->m_dirtyRect = m_tiler->tileRect(tile);

            if (!tile->managedTexture()->reserve(m_tiler->tileSize(), m_textureFormat)) {
                m_skipsIdlePaint = true;
                if (!idle) {
                    m_skipsDraw = true;
                    cleanupResources();
                }
                return;
            }

            dirtyLayerRect.unite(tile->m_dirtyRect);
            tile->copyAndClearDirty();
        }
    }

    m_paintRect = dirtyLayerRect;
    if (dirtyLayerRect.isEmpty())
        return;

    // Due to borders, when the paint rect is extended to tile boundaries, it
    // may end up overlapping more tiles than the original content rect. Record
    // the original tiles so we don't upload more tiles than necessary.
    if (!m_paintRect.isEmpty())
        m_requestedUpdateTilesRect = IntRect(left, top, right - left + 1, bottom - top + 1);

    // Calling prepareToUpdate() calls into WebKit to paint, which may have the side
    // effect of disabling compositing, which causes our reference to the texture updater to be deleted.
    // However, we can't free the memory backing the GraphicsContext until the paint finishes,
    // so we grab a local reference here to hold the updater alive until the paint completes.
    RefPtr<LayerTextureUpdater> protector(textureUpdater());
    IntRect opaqueRect; // FIXME: unused. remove this and store in the layer to pass to impl for draw culling
    textureUpdater()->prepareToUpdate(m_paintRect, m_tiler->tileSize(), m_tiler->hasBorderTexels(), contentsScale(), &opaqueRect);
    for (int j = top; j <= bottom; ++j) {
        for (int i = left; i <= right; ++i) {
            UpdatableTile* tile = tileAt(i, j);

            // Tiles are created before prepareToUpdate() is called.
            if (!tile)
                CRASH();

            // Use m_updateRect as copyAndClearDirty above moved the existing dirty rect to m_updateRect.
            const IntRect& dirtyRect = tile->m_updateRect;
            if (dirtyRect.isEmpty())
                continue;

            IntRect sourceRect = m_tiler->tileRect(tile);
            sourceRect.intersect(dirtyRect);
            // Paint rect not guaranteed to line up on tile boundaries, so
            // make sure that sourceRect doesn't extend outside of it.
            sourceRect.intersect(m_paintRect);

            tile->m_updateRect = sourceRect;
            if (sourceRect.isEmpty())
                continue;

            tile->texture()->prepareRect(sourceRect);
        }
    }
}