kwqfontmetrics.cpp

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/*
 * Copyright (C) 2004 Apple Computer, Inc.  All rights reserved.
 * Portions Copyright (c) 2005 Nokia Corporation, 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 "KWQFontMetrics.h"

#include "KWQFont.h"
#include "KWQLogging.h"
#include "KWQFontFamily.h"

#include "WebCoreTextRenderer.h"
#include "WebCoreTextRendererFactory.h"

#define SCALE(a) ((a)*100/_scalingFactor)

QFontMetrics::QFontMetrics() : _scalingFactor(100)
{
}

QFontMetrics::QFontMetrics(const QFont &font)
    : _font(font), _scalingFactor(100)
{
}

QFontMetrics::QFontMetrics(const QFontMetrics &other)
    : _font(other._font), _scalingFactor(other._scalingFactor)
{
}

QFontMetrics::~QFontMetrics()
{
}

QFontMetrics &QFontMetrics::operator=(const QFontMetrics &other)
{
    _scalingFactor = other._scalingFactor;
    _font = other._font;
    return *this;
}

void QFontMetrics::setFont(const QFont &font)
{
    _font = font;
}

int QFontMetrics::ascent() const
{

    return SCALE(_font.Renderer()->Ascent());
}

int QFontMetrics::descent() const
{
    return SCALE(_font.Renderer()->Descent());
}

int QFontMetrics::height() const
{
    // According to Qt documentation:
    // "This is always equal to ascent()+descent()+1 (the 1 is for the base line)."
    // We DO NOT match the Qt behavior here.  This is intentional.
    return ascent() + descent();
}

int QFontMetrics::lineSpacing() const
{
    return SCALE(_font.Renderer()->LineSpacing());
}

int QFontMetrics::xHeight() const
{
    return SCALE(_font.Renderer()->XHeight());
}

int QFontMetrics::width(QChar qc) const
{
    TText c = qc.unicode();

    CREATE_FAMILY_ARRAY(_font, families);

    TWebCoreTextRun run(&c, 1, 0, 1);

    TWebCoreTextStyle style;
    style.iFamilies = families;

    return SCALE(_font.Renderer()->WidthForRun(run, style));
}

int QFontMetrics::charWidth(const QString &s, int pos) const
{
    return width(s[pos]);
}

int QFontMetrics::width(char c) const
{
    TText ch = (uchar) c;

    CREATE_FAMILY_ARRAY(_font, families);

    TWebCoreTextRun run = TWebCoreTextRun(&ch, 1, 0, 1);

    TWebCoreTextStyle style;
    style.iFamilies = families;

    return SCALE(_font.Renderer()->WidthForRun(run, style));
}

int QFontMetrics::width(const QString &qstring, int len) const
{
    CREATE_FAMILY_ARRAY(_font, families);

    int length = len == -1 ? qstring.length() : len;
    TWebCoreTextRun run = TWebCoreTextRun((const TText*)qstring.unicode(), length, 0, length);

    TWebCoreTextStyle style;
    style.iFamilies = families;

    return SCALE(_font.Renderer()->WidthForRun(run, style));
}

int QFontMetrics::width(const QChar *uchars, int len) const
{
    CREATE_FAMILY_ARRAY(_font, families);

    TWebCoreTextRun run = TWebCoreTextRun((const TText *)uchars, len, 0, len);

    TWebCoreTextStyle style;
    style.iFamilies = families;

    return SCALE(_font.Renderer()->WidthForRun(run, style));
}

float QFontMetrics::floatWidth(const QChar *uchars, int slen, int pos, int len,
                               int letterSpacing, int wordSpacing, bool smallCaps) const
{
    return (float)width(uchars,slen,pos,len,letterSpacing,wordSpacing,smallCaps);
}

int QFontMetrics::width(const QChar *uchars, int slen, int pos, int len,
                               int letterSpacing, int wordSpacing, bool smallCaps) const
{
    CREATE_FAMILY_ARRAY(_font, families);

    TWebCoreTextRun run = TWebCoreTextRun((const TText *)uchars, slen, pos, pos+len);

    TWebCoreTextStyle style;
    style.iLetterSpacing = letterSpacing;
    style.iWordSpacing = wordSpacing;
    style.iSmallCaps = smallCaps;
    style.iFamilies = families;

    return SCALE(_font.Renderer()->WidthForRun(run, style));
}

float QFontMetrics::floatCharacterWidths(const QChar *uchars, int slen, int pos, int len, int toAdd, float *buffer, int letterSpacing, int wordSpacing, bool smallCaps) const
{
    CREATE_FAMILY_ARRAY(_font, families);

    TWebCoreTextRun run = TWebCoreTextRun((const TText *)uchars, slen, pos, pos+len);

    TWebCoreTextStyle style;
    style.iLetterSpacing = letterSpacing;
    style.iWordSpacing = wordSpacing;
    style.iSmallCaps = smallCaps;
    style.iPadding = toAdd;
    style.iFamilies = families;
    float res = SCALE((float)_font.Renderer()->WidthForRun(run, style));
    if (buffer)
        {
        *buffer = res;
        }
    return res;
}

int QFontMetrics::checkSelectionPoint (QChar *s, int slen, int pos, int len, int toAdd, int letterSpacing, int wordSpacing, bool smallCaps, int x, bool reversed, bool includePartialGlyphs) const
{
    CREATE_FAMILY_ARRAY(_font, families);

    TWebCoreTextRun run = TWebCoreTextRun((const TText *)s, slen, pos, pos+len);

    TWebCoreTextStyle style;
    style.iLetterSpacing = letterSpacing;
    style.iWordSpacing = wordSpacing;
    style.iSmallCaps = smallCaps;
    style.iFamilies = families;
    style.iPadding = toAdd;

    return SCALE(_font.Renderer()->PointToOffset(run, style, x, reversed, includePartialGlyphs));
}

QRect QFontMetrics::boundingRect(const QString &qstring, int len) const
{
    return QRect(0, 0, width(qstring, len), height());
}

QRect QFontMetrics::boundingRect(int x, int y, int width, int height, int flags, const QString &str) const
{
    // FIXME: need to support word wrapping?
    return QRect(x, y, width, height).intersect(boundingRect(str));
}

QSize QFontMetrics::size(int, const QString &qstring) const
{
    return QSize(width(qstring), height());
}

void QFontMetrics::setScalingFactor(int factor)
    {
    _scalingFactor = factor;
    }