renderobject.cpp

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                        break;
                    case BSLeft:
                        graphicsContext->drawRect(IntRect(x1, y1 + 1, third, y2 - y1 - 1));
                        graphicsContext->drawRect(IntRect(x2 - third, y1 + 1, third, y2 - y1 - 1));
                        break;
                    case BSRight:
                        graphicsContext->drawRect(IntRect(x1, y1 + 1, third, y2 - y1 - 1));
                        graphicsContext->drawRect(IntRect(x2 - third, y1 + 1, third, y2 - y1 - 1));
                        break;
                }
            } else {
                int adjbw1bigthird = ((adjbw1 > 0) ? adjbw1 + 1 : adjbw1 - 1) / 3;
                int adjbw2bigthird = ((adjbw2 > 0) ? adjbw2 + 1 : adjbw2 - 1) / 3;

                switch (s) {
                    case BSTop:
                        drawLineForBoxSide(graphicsContext, x1 + max((-adjbw1 * 2 + 1) / 3, 0),
                                   y1, x2 - max((-adjbw2 * 2 + 1) / 3, 0), y1 + third,
                                   s, c, textcolor, SOLID, adjbw1bigthird, adjbw2bigthird);
                        drawLineForBoxSide(graphicsContext, x1 + max((adjbw1 * 2 + 1) / 3, 0),
                                   y2 - third, x2 - max((adjbw2 * 2 + 1) / 3, 0), y2,
                                   s, c, textcolor, SOLID, adjbw1bigthird, adjbw2bigthird);
                        break;
                    case BSLeft:
                        drawLineForBoxSide(graphicsContext, x1, y1 + max((-adjbw1 * 2 + 1) / 3, 0),
                                   x1 + third, y2 - max((-adjbw2 * 2 + 1) / 3, 0),
                                   s, c, textcolor, SOLID, adjbw1bigthird, adjbw2bigthird);
                        drawLineForBoxSide(graphicsContext, x2 - third, y1 + max((adjbw1 * 2 + 1) / 3, 0),
                                   x2, y2 - max((adjbw2 * 2 + 1) / 3, 0),
                                   s, c, textcolor, SOLID, adjbw1bigthird, adjbw2bigthird);
                        break;
                    case BSBottom:
                        drawLineForBoxSide(graphicsContext, x1 + max((adjbw1 * 2 + 1) / 3, 0),
                                   y1, x2 - max((adjbw2 * 2 + 1) / 3, 0), y1 + third,
                                   s, c, textcolor, SOLID, adjbw1bigthird, adjbw2bigthird);
                        drawLineForBoxSide(graphicsContext, x1 + max((-adjbw1 * 2 + 1) / 3, 0),
                                   y2 - third, x2 - max((-adjbw2 * 2 + 1) / 3, 0), y2,
                                   s, c, textcolor, SOLID, adjbw1bigthird, adjbw2bigthird);
                        break;
                    case BSRight:
                        drawLineForBoxSide(graphicsContext, x1, y1 + max((adjbw1 * 2 + 1) / 3, 0),
                                   x1 + third, y2 - max(( adjbw2 * 2 + 1) / 3, 0),
                                   s, c, textcolor, SOLID, adjbw1bigthird, adjbw2bigthird);
                        drawLineForBoxSide(graphicsContext, x2 - third, y1 + max((-adjbw1 * 2 + 1) / 3, 0),
                                   x2, y2 - max((-adjbw2 * 2 + 1) / 3, 0),
                                   s, c, textcolor, SOLID, adjbw1bigthird, adjbw2bigthird);
                        break;
                    default:
                        break;
                }
            }
            break;
        }
        case RIDGE:
        case GROOVE:
        {
            EBorderStyle s1;
            EBorderStyle s2;
            if (style == GROOVE) {
                s1 = INSET;
                s2 = OUTSET;
            } else {
                s1 = OUTSET;
                s2 = INSET;
            }

            int adjbw1bighalf = ((adjbw1 > 0) ? adjbw1 + 1 : adjbw1 - 1) / 2;
            int adjbw2bighalf = ((adjbw2 > 0) ? adjbw2 + 1 : adjbw2 - 1) / 2;

            switch (s) {
                case BSTop:
                    drawLineForBoxSide(graphicsContext, x1 + max(-adjbw1, 0) / 2, y1, x2 - max(-adjbw2, 0) / 2, (y1 + y2 + 1) / 2,
                               s, c, textcolor, s1, adjbw1bighalf, adjbw2bighalf);
                    drawLineForBoxSide(graphicsContext, x1 + max(adjbw1 + 1, 0) / 2, (y1 + y2 + 1) / 2, x2 - max(adjbw2 + 1, 0) / 2, y2,
                               s, c, textcolor, s2, adjbw1 / 2, adjbw2 / 2);
                    break;
                case BSLeft:
                    drawLineForBoxSide(graphicsContext, x1, y1 + max(-adjbw1, 0) / 2, (x1 + x2 + 1) / 2, y2 - max(-adjbw2, 0) / 2,
                               s, c, textcolor, s1, adjbw1bighalf, adjbw2bighalf);
                    drawLineForBoxSide(graphicsContext, (x1 + x2 + 1) / 2, y1 + max(adjbw1 + 1, 0) / 2, x2, y2 - max(adjbw2 + 1, 0) / 2,
                               s, c, textcolor, s2, adjbw1 / 2, adjbw2 / 2);
                    break;
                case BSBottom:
                    drawLineForBoxSide(graphicsContext, x1 + max(adjbw1, 0) / 2, y1, x2 - max(adjbw2, 0) / 2, (y1 + y2 + 1) / 2,
                               s, c, textcolor, s2, adjbw1bighalf, adjbw2bighalf);
                    drawLineForBoxSide(graphicsContext, x1 + max(-adjbw1 + 1, 0) / 2, (y1 + y2 + 1) / 2, x2 - max(-adjbw2 + 1, 0) / 2, y2,
                               s, c, textcolor, s1, adjbw1/2, adjbw2/2);
                    break;
                case BSRight:
                    drawLineForBoxSide(graphicsContext, x1, y1 + max(adjbw1, 0) / 2, (x1 + x2 + 1) / 2, y2 - max(adjbw2, 0) / 2,
                               s, c, textcolor, s2, adjbw1bighalf, adjbw2bighalf);
                    drawLineForBoxSide(graphicsContext, (x1 + x2 + 1) / 2, y1 + max(-adjbw1 + 1, 0) / 2, x2, y2 - max(-adjbw2 + 1, 0) / 2,
                               s, c, textcolor, s1, adjbw1/2, adjbw2/2);
                    break;
            }
            break;
        }
        case INSET:
            if (s == BSTop || s == BSLeft)
                c = c.dark();
            // fall through
        case OUTSET:
            if (style == OUTSET && (s == BSBottom || s == BSRight))
                c = c.dark();
            // fall through
        case SOLID: {
            graphicsContext->setStrokeStyle(NoStroke);
            graphicsContext->setFillColor(c);
            ASSERT(x2 >= x1);
            ASSERT(y2 >= y1);
            if (!adjbw1 && !adjbw2) {
                graphicsContext->drawRect(IntRect(x1, y1, x2 - x1, y2 - y1));
                return;
            }
            FloatPoint quad[4];
            switch (s) {
                case BSTop:
                    quad[0] = FloatPoint(x1 + max(-adjbw1, 0), y1);
                    quad[1] = FloatPoint(x1 + max(adjbw1, 0), y2);
                    quad[2] = FloatPoint(x2 - max(adjbw2, 0), y2);
                    quad[3] = FloatPoint(x2 - max(-adjbw2, 0), y1);
                    break;
                case BSBottom:
                    quad[0] = FloatPoint(x1 + max(adjbw1, 0), y1);
                    quad[1] = FloatPoint(x1 + max(-adjbw1, 0), y2);
                    quad[2] = FloatPoint(x2 - max(-adjbw2, 0), y2);
                    quad[3] = FloatPoint(x2 - max(adjbw2, 0), y1);
                    break;
                case BSLeft:
                    quad[0] = FloatPoint(x1, y1 + max(-adjbw1, 0));
                    quad[1] = FloatPoint(x1, y2 - max(-adjbw2, 0));
                    quad[2] = FloatPoint(x2, y2 - max(adjbw2, 0));
                    quad[3] = FloatPoint(x2, y1 + max(adjbw1, 0));
                    break;
                case BSRight:
                    quad[0] = FloatPoint(x1, y1 + max(adjbw1, 0));
                    quad[1] = FloatPoint(x1, y2 - max(adjbw2, 0));
                    quad[2] = FloatPoint(x2, y2 - max(-adjbw2, 0));
                    quad[3] = FloatPoint(x2, y1 + max(-adjbw1, 0));
                    break;
            }
            graphicsContext->drawConvexPolygon(4, quad);
            break;
        }
    }
}

void RenderObject::drawArcForBoxSide(GraphicsContext* graphicsContext, int x, int y, float thickness, IntSize radius,
                                     int angleStart, int angleSpan, BoxSide s, Color c, const Color& textColor,
                                     EBorderStyle style, bool firstCorner)
{
    if ((style == DOUBLE && thickness / 2 < 3) || ((style == RIDGE || style == GROOVE) && thickness / 2 < 2))
        style = SOLID;

    if (!c.isValid()) {
        if (style == INSET || style == OUTSET || style == RIDGE || style == GROOVE)
            c.setRGB(238, 238, 238);
        else
            c = textColor;
    }

    switch (style) {
        case BNONE:
        case BHIDDEN:
            return;
        case DOTTED:
        case DASHED:
            graphicsContext->setStrokeColor(c);
            graphicsContext->setStrokeStyle(style == DOTTED ? DottedStroke : DashedStroke);
            graphicsContext->setStrokeThickness(thickness);
            graphicsContext->strokeArc(IntRect(x, y, radius.width() * 2, radius.height() * 2), angleStart, angleSpan);
            break;
        case DOUBLE: {
            float third = thickness / 3.0f;
            float innerThird = (thickness + 1.0f) / 6.0f;
            int shiftForInner = static_cast<int>(innerThird * 2.5f);

            int outerY = y;
            int outerHeight = radius.height() * 2;
            int innerX = x + shiftForInner;
            int innerY = y + shiftForInner;
            int innerWidth = (radius.width() - shiftForInner) * 2;
            int innerHeight = (radius.height() - shiftForInner) * 2;
            if (innerThird > 1 && (s == BSTop || (firstCorner && (s == BSLeft || s == BSRight)))) {
                outerHeight += 2;
                innerHeight += 2;
            }

            graphicsContext->setStrokeStyle(SolidStroke);
            graphicsContext->setStrokeColor(c);
            graphicsContext->setStrokeThickness(third);
            graphicsContext->strokeArc(IntRect(x, outerY, radius.width() * 2, outerHeight), angleStart, angleSpan);
            graphicsContext->setStrokeThickness(innerThird > 2 ? innerThird - 1 : innerThird);
            graphicsContext->strokeArc(IntRect(innerX, innerY, innerWidth, innerHeight), angleStart, angleSpan);
            break;
        }
        case GROOVE:
        case RIDGE: {
            Color c2;
            if ((style == RIDGE && (s == BSTop || s == BSLeft)) ||
                    (style == GROOVE && (s == BSBottom || s == BSRight)))
                c2 = c.dark();
            else {
                c2 = c;
                c = c.dark();
            }

            graphicsContext->setStrokeStyle(SolidStroke);
            graphicsContext->setStrokeColor(c);
            graphicsContext->setStrokeThickness(thickness);
            graphicsContext->strokeArc(IntRect(x, y, radius.width() * 2, radius.height() * 2), angleStart, angleSpan);

            float halfThickness = (thickness + 1.0f) / 4.0f;
            int shiftForInner = static_cast<int>(halfThickness * 1.5f);
            graphicsContext->setStrokeColor(c2);
            graphicsContext->setStrokeThickness(halfThickness > 2 ? halfThickness - 1 : halfThickness);
            graphicsContext->strokeArc(IntRect(x + shiftForInner, y + shiftForInner, (radius.width() - shiftForInner) * 2,
                                       (radius.height() - shiftForInner) * 2), angleStart, angleSpan);
            break;
        }
        case INSET:
            if (s == BSTop || s == BSLeft)
                c = c.dark();
        case OUTSET:
            if (style == OUTSET && (s == BSBottom || s == BSRight))
                c = c.dark();
        case SOLID:
            graphicsContext->setStrokeStyle(SolidStroke);
            graphicsContext->setStrokeColor(c);
            graphicsContext->setStrokeThickness(thickness);
            graphicsContext->strokeArc(IntRect(x, y, radius.width() * 2, radius.height() * 2), angleStart, angleSpan);
            break;
    }
}

void RenderObject::addPDFURLRect(GraphicsContext* context, const IntRect& rect)
{
    if (rect.isEmpty())
        return;
    Node* n = node();
    if (!n || !n->isLink() || !n->isElementNode())
        return;
    const AtomicString& href = static_cast<Element*>(n)->getAttribute(hrefAttr);
    if (href.isNull())
        return;
    context->setURLForRect(n->document()->completeURL(href), rect);
}

void RenderObject::paintOutline(GraphicsContext* graphicsContext, int tx, int ty, int w, int h, const RenderStyle* style)
{
    if (!hasOutline())
        return;

    int ow = style->outlineWidth();
    EBorderStyle os = style->outlineStyle();

    Color oc = style->outlineColor();
    if (!oc.isValid())
        oc = style->color();

    int offset = style->outlineOffset();

    if (style->outlineStyleIsAuto() || hasOutlineAnnotation()) {
        if (!theme()->supportsFocusRing(style)) {
            // Only paint the focus ring by hand if the theme isn't able to draw the focus ring.
            graphicsContext->initFocusRing(ow, offset);
            addFocusRingRects(graphicsContext, tx, ty);
            if (style->outlineStyleIsAuto())
                graphicsContext->drawFocusRing(oc);
            else
                addPDFURLRect(graphicsContext, graphicsContext->focusRingBoundingRect());
            graphicsContext->clearFocusRing();
        }
    }

    if (style->outlineStyleIsAuto() || style->outlineStyle() == BNONE)
        return;

    tx -= offset;
    ty -= offset;
    w += 2 * offset;
    h += 2 * offset;

    if (h < 0 || w < 0)
        return;

    drawLineForBoxSide(graphicsContext, tx - ow, ty - ow, tx, ty + h + ow,
               BSLeft, Color(oc), style->color(), os, ow, ow);

    drawLineForBoxSide(graphicsContext, tx - ow, ty - ow, tx + w + ow, ty,
               BSTop, Color(oc), style->color(), os, ow, ow);

    drawLineForBoxSide(graphicsContext, tx + w, ty - ow, tx + w + ow, ty + h + ow,
               BSRight, Color(oc), style->color(), os, ow, ow);

    drawLineForBoxSide(graphicsContext, tx - ow, ty + h, tx + w + ow, ty + h + ow,
               BSBottom, Color(oc), style->color(), os, ow, ow);
}


void RenderObject::absoluteRectsForRange(Vector<IntRect>& rects, unsigned start, unsigned end, bool)
{
    if (!firstChild()) {
        if ((isInline() || isAnonymousBlock())) {
            FloatPoint absPos = localToAbsolute(FloatPoint());
            absoluteRects(rects, absPos.x(), absPos.y());
        }
        return;
    }

    unsigned offset = start;
    for (RenderObject* child = childAt(start); child && offset < end; child = child->nextSibling(), ++offset) {
        if (child->isText() || child->isInline() || child->isAnonymousBlock()) {
            FloatPoint absPos = child->localToAbsolute(FloatPoint());
            child->absoluteRects(rects, absPos.x(), absPos.y());
        }
    }
}

void RenderObject::absoluteQuadsForRange(Vector<FloatQuad>& quads, unsigned start, unsigned end, bool)
{
    if (!firstChild()) {
        if (isInline() || isAnonymousBlock())
            absoluteQuads(quads);
        return;
    }

    unsigned offset = start;
    for (RenderObject* child = childAt(start); child && offset < end; child = child->nextSibling(), ++offset) {
        if (child->isText() || child->isInline() || child->isAnonymousBlock())
            child->absoluteQuads(quads);
    }
}

IntRect RenderObject::absoluteBoundingBoxRect(bool useTransforms)
{
    if (useTransforms) {
        Vector<FloatQuad> quads;
        absoluteQuads(quads);

        size_t n = quads.size();
        if (!n)
            return IntRect();
    
        IntRect result = quads[0].enclosingBoundingBox();
        for (size_t i = 1; i < n; ++i)
            result.unite(quads[i].enclosingBoundingBox());
        return result;
    }

    FloatPoint absPos = localToAbsolute();
    Vector<IntRect> rects;
    absoluteRects(rects, absPos.x(), absPos.y());