/*

 * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.

 * Copyright (C) 2006 Michael Emmel mike.emmel@gmail.com 

 * Copyright (C) 2007 Alp Toker <alp.toker@collabora.co.uk>

 * Copyright (C) 2007 Holger Hans Peter Freyther

 * 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. 

 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

 *     its contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission. 

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 "FontData.h"

#include "FloatRect.h"

#include "Font.h"

#include "FontCache.h"

#include "FontDescription.h"

#include "GlyphBuffer.h"

#include <cairo.h>

#include <unicode/uchar.h>

#include <unicode/unorm.h>

#include <wtf/MathExtras.h>

namespace WebCore {

void FontData::platformInit()

{

    cairo_font_extents_t font_extents;

    cairo_text_extents_t text_extents;

    cairo_scaled_font_extents(m_font.m_scaledFont, &font_extents);

    m_ascent = static_cast<int>(font_extents.ascent);

    m_descent = static_cast<int>(font_extents.descent);

    m_lineSpacing = static_cast<int>(font_extents.height);

    cairo_scaled_font_text_extents(m_font.m_scaledFont, "x", &text_extents);

    m_xHeight = text_extents.height;

    cairo_scaled_font_text_extents(m_font.m_scaledFont, " ", &text_extents);

    m_spaceWidth =  static_cast<int>(text_extents.x_advance);

    m_lineGap = m_lineSpacing - m_ascent - m_descent;

}

void FontData::platformDestroy()

{

    if (m_font.m_pattern && ((FcPattern*)-1 != m_font.m_pattern))

        FcPatternDestroy(m_font.m_pattern);

    if (m_font.m_scaledFont)

        cairo_scaled_font_destroy(m_font.m_scaledFont);

    delete m_smallCapsFontData;

}

FontData* FontData::smallCapsFontData(const FontDescription& fontDescription) const

{

    if (!m_smallCapsFontData) {

        FontDescription desc = FontDescription(fontDescription);

        desc.setSpecifiedSize(0.70f*fontDescription.computedSize());

        const FontPlatformData* pdata = new FontPlatformData(desc, desc.family().family());

        m_smallCapsFontData = new FontData(*pdata);

    }

    return m_smallCapsFontData;

}

bool FontData::containsCharacters(const UChar* characters, int length) const

{

    FT_Face face = cairo_ft_scaled_font_lock_face(m_font.m_scaledFont);

    if (!face)

        return false;

    for (unsigned i = 0; i < length; i++) {

        if (FcFreeTypeCharIndex(face, characters[i]) == 0) {

            cairo_ft_scaled_font_unlock_face(m_font.m_scaledFont);

            return false;

        }

    }

    cairo_ft_scaled_font_unlock_face(m_font.m_scaledFont);

    return true;

}

void FontData::determinePitch()

{

    m_treatAsFixedPitch = m_font.isFixedPitch();

}

float FontData::platformWidthForGlyph(Glyph glyph) const

{

    ASSERT(m_font.m_scaledFont);

    cairo_glyph_t cglyph = { glyph, 0, 0 };

    cairo_text_extents_t extents;

    cairo_scaled_font_glyph_extents(m_font.m_scaledFont, &cglyph, 1, &extents);

    float w = (float)m_spaceWidth;

    if (cairo_scaled_font_status(m_font.m_scaledFont) == CAIRO_STATUS_SUCCESS && extents.x_advance != 0)

        w = (float)extents.x_advance;

    return w;

}

void FontData::setFont(cairo_t* cr) const

{

    ASSERT(cr);

    m_font.setFont(cr);

}

}