renderboxmodelobject.cpp

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                    secondAngleSpan = 45;
                }

                // Draw upper right arc
                drawArcForBoxSide(graphicsContext, rightX, leftY, thickness, topRight, secondAngleStart, secondAngleSpan,
                              BSTop, tc, style->color(), ts, false);
                if (applyRightInnerClip)
                    graphicsContext->restore();
            }
        }
    }

    if (renderBottom) {
        bool ignore_left = (renderRadii && bottomLeft.width() > 0) ||
            (bc == lc && bt == lt && bs >= OUTSET &&
             (ls == DOTTED || ls == DASHED || ls == SOLID || ls == OUTSET));

        bool ignore_right = (renderRadii && bottomRight.width() > 0) ||
            (bc == rc && bt == rt && bs >= OUTSET &&
             (rs == DOTTED || rs == DASHED || rs == SOLID || rs == INSET));

        int x = tx;
        int x2 = tx + w;
        if (renderRadii) {
            x += bottomLeft.width();
            x2 -= bottomRight.width();
        }

        drawLineForBoxSide(graphicsContext, x, ty + h - style->borderBottomWidth(), x2, ty + h, BSBottom, bc, style->color(), bs,
                   ignore_left ? 0 : style->borderLeftWidth(), ignore_right ? 0 : style->borderRightWidth());

        if (renderRadii) {
            thickness = style->borderBottomWidth() * 2;

            if (bottomLeft.width()) {
                int leftX = tx;
                int leftY = ty + h - bottomLeft.height() * 2;
                bool applyLeftInnerClip = (style->borderLeftWidth() < bottomLeft.width())
                    && (style->borderBottomWidth() < bottomLeft.height())
                    && (bs != DOUBLE || style->borderBottomWidth() > 6);
                if (applyLeftInnerClip) {
                    graphicsContext->save();
                    graphicsContext->addInnerRoundedRectClip(IntRect(leftX, leftY, bottomLeft.width() * 2, bottomLeft.height() * 2),
                                                             style->borderBottomWidth());
                }

                if (lowerLeftBorderStylesMatch) {
                    firstAngleStart = 180;
                    firstAngleSpan = 90;
                } else {
                    firstAngleStart = 225;
                    firstAngleSpan = 45;
                }

                // Draw lower left arc
                drawArcForBoxSide(graphicsContext, leftX, leftY, thickness, bottomLeft, firstAngleStart, firstAngleSpan,
                              BSBottom, bc, style->color(), bs, true);
                if (applyLeftInnerClip)
                    graphicsContext->restore();
            }

            if (bottomRight.width()) {
                int rightY = ty + h - bottomRight.height() * 2;
                int rightX = tx + w - bottomRight.width() * 2;
                bool applyRightInnerClip = (style->borderRightWidth() < bottomRight.width())
                    && (style->borderBottomWidth() < bottomRight.height())
                    && (bs != DOUBLE || style->borderBottomWidth() > 6);
                if (applyRightInnerClip) {
                    graphicsContext->save();
                    graphicsContext->addInnerRoundedRectClip(IntRect(rightX, rightY, bottomRight.width() * 2, bottomRight.height() * 2),
                                                             style->borderBottomWidth());
                }

                secondAngleStart = 270;
                secondAngleSpan = lowerRightBorderStylesMatch ? 90 : 45;

                // Draw lower right arc
                drawArcForBoxSide(graphicsContext, rightX, rightY, thickness, bottomRight, secondAngleStart, secondAngleSpan,
                              BSBottom, bc, style->color(), bs, false);
                if (applyRightInnerClip)
                    graphicsContext->restore();
            }
        }
    }

    if (renderLeft) {
        bool ignore_top = (renderRadii && topLeft.height() > 0) ||
            (tc == lc && tt == lt && ls >= OUTSET &&
             (ts == DOTTED || ts == DASHED || ts == SOLID || ts == OUTSET));

        bool ignore_bottom = (renderRadii && bottomLeft.height() > 0) ||
            (bc == lc && bt == lt && ls >= OUTSET &&
             (bs == DOTTED || bs == DASHED || bs == SOLID || bs == INSET));

        int y = ty;
        int y2 = ty + h;
        if (renderRadii) {
            y += topLeft.height();
            y2 -= bottomLeft.height();
        }

        drawLineForBoxSide(graphicsContext, tx, y, tx + style->borderLeftWidth(), y2, BSLeft, lc, style->color(), ls,
                   ignore_top ? 0 : style->borderTopWidth(), ignore_bottom ? 0 : style->borderBottomWidth());

        if (renderRadii && (!upperLeftBorderStylesMatch || !lowerLeftBorderStylesMatch)) {
            int topX = tx;
            thickness = style->borderLeftWidth() * 2;

            if (!upperLeftBorderStylesMatch && topLeft.width()) {
                int topY = ty;
                bool applyTopInnerClip = (style->borderLeftWidth() < topLeft.width())
                    && (style->borderTopWidth() < topLeft.height())
                    && (ls != DOUBLE || style->borderLeftWidth() > 6);
                if (applyTopInnerClip) {
                    graphicsContext->save();
                    graphicsContext->addInnerRoundedRectClip(IntRect(topX, topY, topLeft.width() * 2, topLeft.height() * 2),
                                                             style->borderLeftWidth());
                }

                firstAngleStart = 135;
                firstAngleSpan = 45;

                // Draw top left arc
                drawArcForBoxSide(graphicsContext, topX, topY, thickness, topLeft, firstAngleStart, firstAngleSpan,
                              BSLeft, lc, style->color(), ls, true);
                if (applyTopInnerClip)
                    graphicsContext->restore();
            }

            if (!lowerLeftBorderStylesMatch && bottomLeft.width()) {
                int bottomY = ty + h - bottomLeft.height() * 2;
                bool applyBottomInnerClip = (style->borderLeftWidth() < bottomLeft.width())
                    && (style->borderBottomWidth() < bottomLeft.height())
                    && (ls != DOUBLE || style->borderLeftWidth() > 6);
                if (applyBottomInnerClip) {
                    graphicsContext->save();
                    graphicsContext->addInnerRoundedRectClip(IntRect(topX, bottomY, bottomLeft.width() * 2, bottomLeft.height() * 2),
                                                             style->borderLeftWidth());
                }

                secondAngleStart = 180;
                secondAngleSpan = 45;

                // Draw bottom left arc
                drawArcForBoxSide(graphicsContext, topX, bottomY, thickness, bottomLeft, secondAngleStart, secondAngleSpan,
                              BSLeft, lc, style->color(), ls, false);
                if (applyBottomInnerClip)
                    graphicsContext->restore();
            }
        }
    }

    if (renderRight) {
        bool ignore_top = (renderRadii && topRight.height() > 0) ||
            ((tc == rc) && (tt == rt) &&
            (rs >= DOTTED || rs == INSET) &&
            (ts == DOTTED || ts == DASHED || ts == SOLID || ts == OUTSET));

        bool ignore_bottom = (renderRadii && bottomRight.height() > 0) ||
            ((bc == rc) && (bt == rt) &&
            (rs >= DOTTED || rs == INSET) &&
            (bs == DOTTED || bs == DASHED || bs == SOLID || bs == INSET));

        int y = ty;
        int y2 = ty + h;
        if (renderRadii) {
            y += topRight.height();
            y2 -= bottomRight.height();
        }

        drawLineForBoxSide(graphicsContext, tx + w - style->borderRightWidth(), y, tx + w, y2, BSRight, rc, style->color(), rs,
                   ignore_top ? 0 : style->borderTopWidth(), ignore_bottom ? 0 : style->borderBottomWidth());

        if (renderRadii && (!upperRightBorderStylesMatch || !lowerRightBorderStylesMatch)) {
            thickness = style->borderRightWidth() * 2;

            if (!upperRightBorderStylesMatch && topRight.width()) {
                int topX = tx + w - topRight.width() * 2;
                int topY = ty;
                bool applyTopInnerClip = (style->borderRightWidth() < topRight.width())
                    && (style->borderTopWidth() < topRight.height())
                    && (rs != DOUBLE || style->borderRightWidth() > 6);
                if (applyTopInnerClip) {
                    graphicsContext->save();
                    graphicsContext->addInnerRoundedRectClip(IntRect(topX, topY, topRight.width() * 2, topRight.height() * 2),
                                                             style->borderRightWidth());
                }

                firstAngleStart = 0;
                firstAngleSpan = 45;

                // Draw top right arc
                drawArcForBoxSide(graphicsContext, topX, topY, thickness, topRight, firstAngleStart, firstAngleSpan,
                              BSRight, rc, style->color(), rs, true);
                if (applyTopInnerClip)
                    graphicsContext->restore();
            }

            if (!lowerRightBorderStylesMatch && bottomRight.width()) {
                int bottomX = tx + w - bottomRight.width() * 2;
                int bottomY = ty + h - bottomRight.height() * 2;
                bool applyBottomInnerClip = (style->borderRightWidth() < bottomRight.width())
                    && (style->borderBottomWidth() < bottomRight.height())
                    && (rs != DOUBLE || style->borderRightWidth() > 6);
                if (applyBottomInnerClip) {
                    graphicsContext->save();
                    graphicsContext->addInnerRoundedRectClip(IntRect(bottomX, bottomY, bottomRight.width() * 2, bottomRight.height() * 2),
                                                             style->borderRightWidth());
                }

                secondAngleStart = 315;
                secondAngleSpan = 45;

                // Draw bottom right arc
                drawArcForBoxSide(graphicsContext, bottomX, bottomY, thickness, bottomRight, secondAngleStart, secondAngleSpan,
                              BSRight, rc, style->color(), rs, false);
                if (applyBottomInnerClip)
                    graphicsContext->restore();
            }
        }
    }

    if (renderRadii)
        graphicsContext->restore();
}

void RenderBoxModelObject::paintBoxShadow(GraphicsContext* context, int tx, int ty, int w, int h, const RenderStyle* s, bool begin, bool end)
{
    // FIXME: Deal with border-image.  Would be great to use border-image as a mask.

    IntRect rect(tx, ty, w, h);
    bool hasBorderRadius = s->hasBorderRadius();
    bool hasOpaqueBackground = s->backgroundColor().isValid() && s->backgroundColor().alpha() == 255;
    for (ShadowData* shadow = s->boxShadow(); shadow; shadow = shadow->next) {
        context->save();

        IntSize shadowOffset(shadow->x, shadow->y);
        int shadowBlur = shadow->blur;
        IntRect fillRect(rect);

        if (hasBorderRadius) {
            IntRect shadowRect(rect);
            shadowRect.inflate(shadowBlur);
            shadowRect.move(shadowOffset);
            context->clip(shadowRect);

            // Move the fill just outside the clip, adding 1 pixel separation so that the fill does not
            // bleed in (due to antialiasing) if the context is transformed.
            IntSize extraOffset(w + max(0, shadowOffset.width()) + shadowBlur + 1, 0);
            shadowOffset -= extraOffset;
            fillRect.move(extraOffset);
        }

        context->setShadow(shadowOffset, shadowBlur, shadow->color);
        if (hasBorderRadius) {
            IntSize topLeft = begin ? s->borderTopLeftRadius() : IntSize();
            IntSize topRight = end ? s->borderTopRightRadius() : IntSize();
            IntSize bottomLeft = begin ? s->borderBottomLeftRadius() : IntSize();
            IntSize bottomRight = end ? s->borderBottomRightRadius() : IntSize();
            if (!hasOpaqueBackground)
                context->clipOutRoundedRect(rect, topLeft, topRight, bottomLeft, bottomRight);
            context->fillRoundedRect(fillRect, topLeft, topRight, bottomLeft, bottomRight, Color::black);
        } else {
            if (!hasOpaqueBackground)
                context->clipOut(rect);
            context->fillRect(fillRect, Color::black);
        }
        context->restore();
    }
}

int RenderBoxModelObject::containingBlockWidthForContent() const
{
    return containingBlock()->availableWidth();
}

} // namespace WebCore