/*

 * Copyright (C) 2007 Apple Inc.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

 */

#include "config.h"

#include "WebCoreTextRenderer.h"

#include "Font.h"

#include "FontDescription.h"

#include "GraphicsContext.h"

#include "StringTruncator.h"

#include "TextStyle.h"

#include <wtf/unicode/Unicode.h>

namespace WebCore {

static bool isOneLeftToRightRun(const TextRun& run)

{

    unsigned i;

    for (i = 0; i < run.length(); i++) {

        WTF::Unicode::Direction direction = WTF::Unicode::direction(run[i]);

        if (direction == WTF::Unicode::RightToLeft || direction > WTF::Unicode::OtherNeutral)

            return false;

    }

    return true;

}

static void doDrawTextAtPoint(GraphicsContext& context, const String& text, const IntPoint& point, const Font& font, const Color& color, int underlinedIndex)

{

    TextRun run(text.characters(), text.length());

    TextStyle style;

    context.setFillColor(color);

    if (isOneLeftToRightRun(run))

        font.drawText(&context, run, style, point);

    else {

        context.setFont(font);

        context.drawBidiText(run, point, style);

    }

    if (underlinedIndex >= 0) {

        ASSERT(underlinedIndex < static_cast<int>(text.length()));

        int beforeWidth;

        if (underlinedIndex > 0) {

            TextRun beforeRun(text.characters(), underlinedIndex);

            beforeWidth = font.width(beforeRun, style);

        } else

            beforeWidth = 0;

        TextRun underlinedRun(text.characters() + underlinedIndex, 1);

        int underlinedWidth = font.width(underlinedRun, style);

        IntPoint underlinePoint(point);

        underlinePoint.move(beforeWidth, 1);

        context.setStrokeColor(color);

        context.drawLineForText(underlinePoint, underlinedWidth, false);

    }

}

void WebCoreDrawTextAtPoint(GraphicsContext& context, const String& text, const IntPoint& point, const Font& font, const Color& color, int underlinedIndex)

{

    context.save();

    doDrawTextAtPoint(context, text, point, font, color, underlinedIndex);

    context.restore();

}

void WebCoreDrawDoubledTextAtPoint(GraphicsContext& context, const String& text, const IntPoint& point, const Font& font, const Color& topColor, const Color& bottomColor, int underlinedIndex)

{

    context.save();

    IntPoint textPos = point;

    doDrawTextAtPoint(context, text, textPos, font, bottomColor, underlinedIndex);

    textPos.move(0, -1);

    doDrawTextAtPoint(context, text, textPos, font, topColor, underlinedIndex);

    context.restore();

}

float WebCoreTextFloatWidth(const String& text, const Font& font)

{

    return StringTruncator::width(text, font, false);

}

} // namespace WebCore