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/*
* Copyright (C) Research In Motion Limited 2010. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "SVGTextLayoutEngineSpacing.h"
#include "FontCascade.h"
#include "SVGLengthContext.h"
#include "SVGRenderStyle.h"
#if ENABLE(SVG_FONTS)
#include "SVGFontElement.h"
#include "SVGFontFaceElement.h"
#endif
namespace WebCore {
SVGTextLayoutEngineSpacing::SVGTextLayoutEngineSpacing(const FontCascade& font)
: m_font(font)
, m_lastCharacter(0)
{
}
float SVGTextLayoutEngineSpacing::calculateCSSKerningAndSpacing(const SVGRenderStyle* style, SVGElement* contextElement, const UChar* currentCharacter)
{
float kerning = 0;
auto kerningLength = style->kerning();
if (kerningLength.unitType() == LengthTypePercentage)
kerning = kerningLength.valueAsPercentage() * m_font.pixelSize();
else {
SVGLengthContext lengthContext(contextElement);
kerning = kerningLength.value(lengthContext);
}
const UChar* lastCharacter = m_lastCharacter;
m_lastCharacter = currentCharacter;
if (!kerning && !m_font.letterSpacing() && !m_font.wordSpacing())
return 0;
float spacing = m_font.letterSpacing() + kerning;
if (currentCharacter && lastCharacter && m_font.wordSpacing()) {
if (FontCascade::treatAsSpace(*currentCharacter) && !FontCascade::treatAsSpace(*lastCharacter))
spacing += m_font.wordSpacing();
}
return spacing;
}
}
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