renderobject.cpp

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    size_t n = rects.size();
    if (!n)
        return IntRect();

    IntRect result = rects[0];
    for (size_t i = 1; i < n; ++i)
        result.unite(rects[i]);
    return result;
}

void RenderObject::addAbsoluteRectForLayer(IntRect& result)
{
    if (hasLayer())
        result.unite(absoluteBoundingBoxRect());
    for (RenderObject* current = firstChild(); current; current = current->nextSibling())
        current->addAbsoluteRectForLayer(result);
}

IntRect RenderObject::paintingRootRect(IntRect& topLevelRect)
{
    IntRect result = absoluteBoundingBoxRect();
    topLevelRect = result;
    for (RenderObject* current = firstChild(); current; current = current->nextSibling())
        current->addAbsoluteRectForLayer(result);
    return result;
}

void RenderObject::paint(PaintInfo& /*paintInfo*/, int /*tx*/, int /*ty*/)
{
}

RenderBoxModelObject* RenderObject::containerForRepaint() const
{
#if USE(ACCELERATED_COMPOSITING)
    if (RenderView* v = view()) {
        if (v->usesCompositing()) {
            RenderLayer* compLayer = enclosingLayer()->enclosingCompositingLayer();
            return compLayer ? compLayer->renderer() : 0;
        }
    }
#endif
    // Do root-relative repaint.
    return 0;
}

void RenderObject::repaintUsingContainer(RenderBoxModelObject* repaintContainer, const IntRect& r, bool immediate)
{
    if (!repaintContainer || repaintContainer->isRenderView()) {
        RenderView* v = repaintContainer ? toRenderView(repaintContainer) : view();
        v->repaintViewRectangle(r, immediate);
    } else {
#if USE(ACCELERATED_COMPOSITING)
        RenderView* v = view();
        if (v->usesCompositing()) {
            ASSERT(repaintContainer->hasLayer() && repaintContainer->layer()->isComposited());
            repaintContainer->layer()->setBackingNeedsRepaintInRect(r);
        }
#else
        ASSERT_NOT_REACHED();
#endif
    }
}

void RenderObject::repaint(bool immediate)
{
    // Don't repaint if we're unrooted (note that view() still returns the view when unrooted)
    RenderView* view;
    if (!isRooted(&view))
        return;

    if (view->printing())
        return; // Don't repaint if we're printing.

    RenderBoxModelObject* repaintContainer = containerForRepaint();
    repaintUsingContainer(repaintContainer ? repaintContainer : view, clippedOverflowRectForRepaint(repaintContainer), immediate);
}

void RenderObject::repaintRectangle(const IntRect& r, bool immediate)
{
    // Don't repaint if we're unrooted (note that view() still returns the view when unrooted)
    RenderView* view;
    if (!isRooted(&view))
        return;

    if (view->printing())
        return; // Don't repaint if we're printing.

    IntRect dirtyRect(r);

    // FIXME: layoutDelta needs to be applied in parts before/after transforms and
    // repaint containers. https://bugs.webkit.org/show_bug.cgi?id=23308
    dirtyRect.move(view->layoutDelta());

    RenderBoxModelObject* repaintContainer = containerForRepaint();
    computeRectForRepaint(repaintContainer, dirtyRect);
    repaintUsingContainer(repaintContainer ? repaintContainer : view, dirtyRect, immediate);
}

bool RenderObject::repaintAfterLayoutIfNeeded(RenderBoxModelObject* repaintContainer, const IntRect& oldBounds, const IntRect& oldOutlineBox)
{
    RenderView* v = view();
    if (v->printing())
        return false; // Don't repaint if we're printing.

    IntRect newBounds = clippedOverflowRectForRepaint(repaintContainer);
    IntRect newOutlineBox;

    bool fullRepaint = selfNeedsLayout();
    // Presumably a background or a border exists if border-fit:lines was specified.
    if (!fullRepaint && style()->borderFit() == BorderFitLines)
        fullRepaint = true;
    if (!fullRepaint) {
        newOutlineBox = outlineBoundsForRepaint(repaintContainer);
        if (newOutlineBox.location() != oldOutlineBox.location() || (mustRepaintBackgroundOrBorder() && (newBounds != oldBounds || newOutlineBox != oldOutlineBox)))
            fullRepaint = true;
    }

    if (!repaintContainer)
        repaintContainer = v;

    if (fullRepaint) {
        repaintUsingContainer(repaintContainer, oldBounds);
        if (newBounds != oldBounds)
            repaintUsingContainer(repaintContainer, newBounds);
        return true;
    }

    if (newBounds == oldBounds && newOutlineBox == oldOutlineBox)
        return false;

    int deltaLeft = newBounds.x() - oldBounds.x();
    if (deltaLeft > 0)
        repaintUsingContainer(repaintContainer, IntRect(oldBounds.x(), oldBounds.y(), deltaLeft, oldBounds.height()));
    else if (deltaLeft < 0)
        repaintUsingContainer(repaintContainer, IntRect(newBounds.x(), newBounds.y(), -deltaLeft, newBounds.height()));

    int deltaRight = newBounds.right() - oldBounds.right();
    if (deltaRight > 0)
        repaintUsingContainer(repaintContainer, IntRect(oldBounds.right(), newBounds.y(), deltaRight, newBounds.height()));
    else if (deltaRight < 0)
        repaintUsingContainer(repaintContainer, IntRect(newBounds.right(), oldBounds.y(), -deltaRight, oldBounds.height()));

    int deltaTop = newBounds.y() - oldBounds.y();
    if (deltaTop > 0)
        repaintUsingContainer(repaintContainer, IntRect(oldBounds.x(), oldBounds.y(), oldBounds.width(), deltaTop));
    else if (deltaTop < 0)
        repaintUsingContainer(repaintContainer, IntRect(newBounds.x(), newBounds.y(), newBounds.width(), -deltaTop));

    int deltaBottom = newBounds.bottom() - oldBounds.bottom();
    if (deltaBottom > 0)
        repaintUsingContainer(repaintContainer, IntRect(newBounds.x(), oldBounds.bottom(), newBounds.width(), deltaBottom));
    else if (deltaBottom < 0)
        repaintUsingContainer(repaintContainer, IntRect(oldBounds.x(), newBounds.bottom(), oldBounds.width(), -deltaBottom));

    if (newOutlineBox == oldOutlineBox)
        return false;

    // We didn't move, but we did change size.  Invalidate the delta, which will consist of possibly
    // two rectangles (but typically only one).
    RenderStyle* outlineStyle = outlineStyleForRepaint();
    int ow = outlineStyle->outlineSize();
    ShadowData* boxShadow = style()->boxShadow();
    int width = abs(newOutlineBox.width() - oldOutlineBox.width());
    if (width) {
        int shadowRight = 0;
        for (ShadowData* shadow = boxShadow; shadow; shadow = shadow->next)
            shadowRight = max(shadow->x + shadow->blur, shadowRight);

        int borderRight = isBox() ? toRenderBox(this)->borderRight() : 0;
        int borderWidth = max(-outlineStyle->outlineOffset(), max(borderRight, max(style()->borderTopRightRadius().width(), style()->borderBottomRightRadius().width()))) + max(ow, shadowRight);
        IntRect rightRect(newOutlineBox.x() + min(newOutlineBox.width(), oldOutlineBox.width()) - borderWidth,
            newOutlineBox.y(),
            width + borderWidth,
            max(newOutlineBox.height(), oldOutlineBox.height()));
        int right = min(newBounds.right(), oldBounds.right());
        if (rightRect.x() < right) {
            rightRect.setWidth(min(rightRect.width(), right - rightRect.x()));
            repaintUsingContainer(repaintContainer, rightRect);
        }
    }
    int height = abs(newOutlineBox.height() - oldOutlineBox.height());
    if (height) {
        int shadowBottom = 0;
        for (ShadowData* shadow = boxShadow; shadow; shadow = shadow->next)
            shadowBottom = max(shadow->y + shadow->blur, shadowBottom);

        int borderBottom = isBox() ? toRenderBox(this)->borderBottom() : 0;
        int borderHeight = max(-outlineStyle->outlineOffset(), max(borderBottom, max(style()->borderBottomLeftRadius().height(), style()->borderBottomRightRadius().height()))) + max(ow, shadowBottom);
        IntRect bottomRect(newOutlineBox.x(),
            min(newOutlineBox.bottom(), oldOutlineBox.bottom()) - borderHeight,
            max(newOutlineBox.width(), oldOutlineBox.width()),
            height + borderHeight);
        int bottom = min(newBounds.bottom(), oldBounds.bottom());
        if (bottomRect.y() < bottom) {
            bottomRect.setHeight(min(bottomRect.height(), bottom - bottomRect.y()));
            repaintUsingContainer(repaintContainer, bottomRect);
        }
    }
    return false;
}

void RenderObject::repaintDuringLayoutIfMoved(const IntRect&)
{
}

void RenderObject::repaintOverhangingFloats(bool)
{
}

bool RenderObject::checkForRepaintDuringLayout() const
{
    // FIXME: <https://bugs.webkit.org/show_bug.cgi?id=20885> It is probably safe to also require
    // m_everHadLayout. Currently, only RenderBlock::layoutBlock() adds this condition. See also
    // <https://bugs.webkit.org/show_bug.cgi?id=15129>.
    return !document()->view()->needsFullRepaint() && !hasLayer();
}

IntRect RenderObject::rectWithOutlineForRepaint(RenderBoxModelObject* repaintContainer, int outlineWidth)
{
    IntRect r(clippedOverflowRectForRepaint(repaintContainer));
    r.inflate(outlineWidth);
    return r;
}

IntRect RenderObject::clippedOverflowRectForRepaint(RenderBoxModelObject*)
{
    ASSERT_NOT_REACHED();
    return IntRect();
}

void RenderObject::computeRectForRepaint(RenderBoxModelObject* repaintContainer, IntRect& rect, bool fixed)
{
    if (repaintContainer == this)
        return;

    if (RenderObject* o = parent()) {
        if (o->isBlockFlow()) {
            RenderBlock* cb = toRenderBlock(o);
            if (cb->hasColumns())
                cb->adjustRectForColumns(rect);
        }

        if (o->hasOverflowClip()) {
            // o->height() is inaccurate if we're in the middle of a layout of |o|, so use the
            // layer's size instead.  Even if the layer's size is wrong, the layer itself will repaint
            // anyway if its size does change.
            RenderBox* boxParent = toRenderBox(o);

            IntRect boxRect(0, 0, boxParent->layer()->width(), boxParent->layer()->height());
            int x = rect.x();
            int y = rect.y();
            boxParent->layer()->subtractScrolledContentOffset(x, y); // For overflow:auto/scroll/hidden.
            IntRect repaintRect(x, y, rect.width(), rect.height());
            rect = intersection(repaintRect, boxRect);
            if (rect.isEmpty())
                return;
        }

        o->computeRectForRepaint(repaintContainer, rect, fixed);
    }
}

void RenderObject::dirtyLinesFromChangedChild(RenderObject*)
{
}

#ifndef NDEBUG

void RenderObject::showTreeForThis() const
{
    if (node())
        node()->showTreeForThis();
}

#endif // NDEBUG

Color RenderObject::selectionBackgroundColor() const
{
    Color color;
    if (style()->userSelect() != SELECT_NONE) {
         RefPtr<RenderStyle> pseudoStyle = getUncachedPseudoStyle(SELECTION);
        if (pseudoStyle && pseudoStyle->backgroundColor().isValid())
            color = pseudoStyle->backgroundColor().blendWithWhite();
        else
            color = document()->frame()->selection()->isFocusedAndActive() ?
                    theme()->activeSelectionBackgroundColor() :
                    theme()->inactiveSelectionBackgroundColor();
    }

    return color;
}

Color RenderObject::selectionForegroundColor() const
{
    Color color;
    if (style()->userSelect() == SELECT_NONE)
        return color;

    if (RefPtr<RenderStyle> pseudoStyle = getUncachedPseudoStyle(SELECTION)) {
        color = pseudoStyle->textFillColor();
        if (!color.isValid())
            color = pseudoStyle->color();
    } else
        color = document()->frame()->selection()->isFocusedAndActive() ?
                theme()->activeSelectionForegroundColor() :
                theme()->inactiveSelectionForegroundColor();

    return color;
}

Node* RenderObject::draggableNode(bool dhtmlOK, bool uaOK, int x, int y, bool& dhtmlWillDrag) const
{
    if (!dhtmlOK && !uaOK)
        return 0;

    for (const RenderObject* curr = this; curr; curr = curr->parent()) {
        Node* elt = curr->node();
        if (elt && elt->nodeType() == Node::TEXT_NODE) {
            // Since there's no way for the author to address the -webkit-user-drag style for a text node,
            // we use our own judgement.
            if (uaOK && view()->frameView()->frame()->eventHandler()->shouldDragAutoNode(curr->node(), IntPoint(x, y))) {
                dhtmlWillDrag = false;
                return curr->node();
            }
            if (elt->canStartSelection())
                // In this case we have a click in the unselected portion of text.  If this text is
                // selectable, we want to start the selection process instead of looking for a parent
                // to try to drag.
                return 0;
        } else {
            EUserDrag dragMode = curr->style()->userDrag();
            if (dhtmlOK && dragMode == DRAG_ELEMENT) {
                dhtmlWillDrag = true;
                return curr->node();
            }
            if (uaOK && dragMode == DRAG_AUTO
                    && view()->frameView()->frame()->eventHandler()->shouldDragAutoNode(curr->node(), IntPoint(x, y))) {
                dhtmlWillDrag = false;
                return curr->node();
            }
        }
    }
    return 0;
}

void RenderObject::selectionStartEnd(int& spos, int& epos) const
{
    view()->selectionStartEnd(spos, epos);
}

void RenderObject::handleDynamicFloatPositionChange()
{