C++ TileIndex::y方法代码示例

void TileGrid::setNeedsDisplayInRect(const IntRect& rect)
{
    if (m_tiles.isEmpty())
        return;

    FloatRect scaledRect(rect);
    scaledRect.scale(m_scale);
    IntRect repaintRectInTileCoords(enclosingIntRect(scaledRect));

    IntSize tileSize = m_controller.tileSize();

    // For small invalidations, lookup the covered tiles.
    if (repaintRectInTileCoords.height() < 2 * tileSize.height() && repaintRectInTileCoords.width() < 2 * tileSize.width()) {
        TileIndex topLeft;
        TileIndex bottomRight;
        getTileIndexRangeForRect(repaintRectInTileCoords, topLeft, bottomRight);

        for (int y = topLeft.y(); y <= bottomRight.y(); ++y) {
            for (int x = topLeft.x(); x <= bottomRight.x(); ++x) {
                TileIndex tileIndex(x, y);

                TileMap::iterator it = m_tiles.find(tileIndex);
                if (it != m_tiles.end())
                    setTileNeedsDisplayInRect(tileIndex, it->value, repaintRectInTileCoords, m_primaryTileCoverageRect);
            }
        }
        return;
    }

    for (TileMap::iterator it = m_tiles.begin(), end = m_tiles.end(); it != end; ++it)
        setTileNeedsDisplayInRect(it->key, it->value, repaintRectInTileCoords, m_primaryTileCoverageRect);
}

IntRect TileGrid::extent() const
{
    TileIndex topLeft;
    TileIndex bottomRight;
    getTileIndexRangeForRect(m_primaryTileCoverageRect, topLeft, bottomRight);

    // Return index of top, left tile and the number of tiles across and down.
    return IntRect(topLeft.x(), topLeft.y(), bottomRight.x() - topLeft.x() + 1, bottomRight.y() - topLeft.y() + 1);
}

IntRect TileGrid::rectForTileIndex(const TileIndex& tileIndex) const
{
    // FIXME: calculating the scaled size here should match with the rest of calculated sizes where we use the combination of
    // enclosingIntRect, expandedIntSize (floor vs ceil).
    // However enclosing this size could reveal gap on root layer's background. see RenderView::backgroundRect()
    IntSize tileSize = m_controller.tileSize();
    IntRect rect(tileIndex.x() * tileSize.width(), tileIndex.y() * tileSize.height(), tileSize.width(), tileSize.height());
    IntRect scaledBounds(m_controller.bounds());
    scaledBounds.scale(m_scale);
    rect.intersect(scaledBounds);
    return rect;
}

IntRect TileGrid::ensureTilesForRect(const FloatRect& rect, CoverageType newTileType)
{
    if (m_controller.unparentsOffscreenTiles() && !m_controller.isInWindow())
        return IntRect();

    FloatRect scaledRect(rect);
    scaledRect.scale(m_scale);
    IntRect rectInTileCoords(enclosingIntRect(scaledRect));

    TileIndex topLeft;
    TileIndex bottomRight;
    getTileIndexRangeForRect(rectInTileCoords, topLeft, bottomRight);

    TileCohort currCohort = nextTileCohort();
    unsigned tilesInCohort = 0;

    IntRect coverageRect;

    for (int y = topLeft.y(); y <= bottomRight.y(); ++y) {
        for (int x = topLeft.x(); x <= bottomRight.x(); ++x) {
            TileIndex tileIndex(x, y);

            IntRect tileRect = rectForTileIndex(tileIndex);
            TileInfo& tileInfo = m_tiles.add(tileIndex, TileInfo()).iterator->value;

            coverageRect.unite(tileRect);

            bool shouldChangeTileLayerFrame = false;

            if (!tileInfo.layer) {
                tileInfo.layer = m_controller.createTileLayer(tileRect, *this);
                ASSERT(!m_tileRepaintCounts.contains(tileInfo.layer.get()));
            } else {
                // We already have a layer for this tile. Ensure that its size is correct.
                FloatSize tileLayerSize(tileInfo.layer->bounds().size());
                shouldChangeTileLayerFrame = tileLayerSize != FloatSize(tileRect.size());

                if (shouldChangeTileLayerFrame) {
                    tileInfo.layer->setBounds(FloatRect(FloatPoint(), tileRect.size()));
                    tileInfo.layer->setPosition(tileRect.location());
                    tileInfo.layer->setNeedsDisplay();
                }
            }

            if (newTileType == CoverageType::SecondaryTiles && !tileRect.intersects(m_primaryTileCoverageRect)) {
                tileInfo.cohort = currCohort;
                ++tilesInCohort;
            }

            bool shouldParentTileLayer = (!m_controller.unparentsOffscreenTiles() || m_controller.isInWindow()) && !tileInfo.layer->superlayer();

            if (shouldParentTileLayer)
                m_containerLayer.get().appendSublayer(*tileInfo.layer);
        }
    }

    if (tilesInCohort)
        startedNewCohort(currCohort);

    return coverageRect;
}

void TileGrid::revalidateTiles(TileValidationPolicy validationPolicy)
{
    FloatRect coverageRect = m_controller.coverageRect();
    IntRect bounds = m_controller.bounds();

    if (coverageRect.isEmpty() || bounds.isEmpty())
        return;

    FloatRect scaledRect(coverageRect);
    scaledRect.scale(m_scale);
    IntRect coverageRectInTileCoords(enclosingIntRect(scaledRect));

    TileCohort currCohort = nextTileCohort();
    unsigned tilesInCohort = 0;

    double minimumRevalidationTimerDuration = std::numeric_limits<double>::max();
    bool needsTileRevalidation = false;

    // Move tiles newly outside the coverage rect into the cohort map.
    for (TileMap::iterator it = m_tiles.begin(), end = m_tiles.end(); it != end; ++it) {
        TileInfo& tileInfo = it->value;
        TileIndex tileIndex = it->key;

        PlatformCALayer* tileLayer = tileInfo.layer.get();
        IntRect tileRect = rectForTileIndex(tileIndex);
        if (tileRect.intersects(coverageRectInTileCoords)) {
            tileInfo.cohort = VisibleTileCohort;
            if (tileInfo.hasStaleContent) {
                // FIXME: store a dirty region per layer?
                tileLayer->setNeedsDisplay();
                tileInfo.hasStaleContent = false;
            }
        } else {
            // Add to the currentCohort if not already in one.
            if (tileInfo.cohort == VisibleTileCohort) {
                tileInfo.cohort = currCohort;
                ++tilesInCohort;

                if (m_controller.unparentsOffscreenTiles())
                    tileLayer->removeFromSuperlayer();
            } else if (m_controller.unparentsOffscreenTiles() && m_controller.shouldAggressivelyRetainTiles() && tileLayer->superlayer()) {
                // Aggressive tile retention means we'll never remove cohorts, but we need to make sure they're unparented.
                // We can't immediately unparent cohorts comprised of secondary tiles that never touch the primary coverage rect,
                // because that would defeat the usefulness of prepopulateRect(); instead, age prepopulated tiles out as if they were being removed.
                for (auto& cohort : m_cohortList) {
                    if (cohort.cohort != tileInfo.cohort)
                        continue;
                    double timeUntilCohortExpires = cohort.timeUntilExpiration();
                    if (timeUntilCohortExpires > 0) {
                        minimumRevalidationTimerDuration = std::min(minimumRevalidationTimerDuration, timeUntilCohortExpires);
                        needsTileRevalidation = true;
                    } else
                        tileLayer->removeFromSuperlayer();
                    break;
                }
            }
        }
    }

    if (needsTileRevalidation)
        m_controller.scheduleTileRevalidation(minimumRevalidationTimerDuration);

    if (tilesInCohort)
        startedNewCohort(currCohort);

    if (!m_controller.shouldAggressivelyRetainTiles()) {
        if (m_controller.shouldTemporarilyRetainTileCohorts())
            scheduleCohortRemoval();
        else if (tilesInCohort)
            removeTilesInCohort(currCohort);
    }

    // Ensure primary tile coverage tiles.
    m_primaryTileCoverageRect = ensureTilesForRect(coverageRect, CoverageType::PrimaryTiles);

    if (validationPolicy & PruneSecondaryTiles) {
        removeAllSecondaryTiles();
        m_cohortList.clear();
    } else {
        for (auto& secondaryCoverageRect : m_secondaryTileCoverageRects) {
            FloatRect secondaryRectInLayerCoordinates(secondaryCoverageRect);
            secondaryRectInLayerCoordinates.scale(1 / m_scale);
            ensureTilesForRect(secondaryRectInLayerCoordinates, CoverageType::SecondaryTiles);
        }
        m_secondaryTileCoverageRects.clear();
    }

    if (m_controller.unparentsOffscreenTiles() && (validationPolicy & UnparentAllTiles)) {
        for (TileMap::iterator it = m_tiles.begin(), end = m_tiles.end(); it != end; ++it)
            it->value.layer->removeFromSuperlayer();
    }

    auto boundsAtLastRevalidate = m_controller.boundsAtLastRevalidate();
    if (boundsAtLastRevalidate != bounds) {
        // If there are margin tiles and the bounds have grown taller or wider, then the tiles that used to
        // be bottom or right margin tiles need to be invalidated.
        if (m_controller.hasMargins()) {
            if (bounds.width() > boundsAtLastRevalidate.width() || bounds.height() > boundsAtLastRevalidate.height()) {
                IntRect boundsWithoutMargin = m_controller.boundsWithoutMargin();
                IntRect oldBoundsWithoutMargin = m_controller.boundsAtLastRevalidateWithoutMargin();
//.........这里部分代码省略.........