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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"
#if ENABLE(SVG)
#include "SVGTextMetrics.h"
#include "RenderSVGInlineText.h"
namespace WebCore {
SVGTextMetrics::SVGTextMetrics()
: m_width(0)
, m_height(0)
, m_length(0)
{
}
SVGTextMetrics::SVGTextMetrics(const Font& font, const TextRun& run, unsigned position, unsigned textLength)
: m_width(0)
, m_height(0)
, m_length(0)
{
int extraCharsAvailable = textLength - (position + run.length());
int length = 0;
m_width = font.floatWidth(run, extraCharsAvailable, length, m_glyph.name);
m_height = font.height();
m_glyph.unicodeString = String(run.characters(), length);
m_glyph.isValid = true;
ASSERT(length >= 0);
m_length = static_cast<unsigned>(length);
}
bool SVGTextMetrics::operator==(const SVGTextMetrics& other)
{
return m_width == other.m_width
&& m_height == other.m_height
&& m_length == other.m_length
&& m_glyph == other.m_glyph;
}
SVGTextMetrics SVGTextMetrics::emptyMetrics()
{
DEFINE_STATIC_LOCAL(SVGTextMetrics, s_emptyMetrics, ());
s_emptyMetrics.m_length = 1;
return s_emptyMetrics;
}
static TextRun constructTextRun(RenderSVGInlineText* text, const UChar* characters, unsigned position, unsigned length)
{
TextRun run(characters + position, length);
#if ENABLE(SVG_FONTS)
ASSERT(text->parent());
run.setReferencingRenderObject(text->parent());
#endif
// Disable any word/character rounding.
run.disableRoundingHacks();
// We handle letter & word spacing ourselves.
run.disableSpacing();
return run;
}
SVGTextMetrics SVGTextMetrics::measureCharacterRange(RenderSVGInlineText* text, unsigned position, unsigned length)
{
ASSERT(text);
ASSERT(text->style());
TextRun run(constructTextRun(text, text->characters(), position, length));
return SVGTextMetrics(text->style()->font(), run, position, text->textLength());
}
void SVGTextMetrics::measureAllCharactersIndividually(RenderSVGInlineText* text, Vector<SVGTextMetrics>& allMetrics)
{
ASSERT(text);
ASSERT(text->style());
const Font& font = text->style()->font();
const UChar* characters = text->characters();
unsigned length = text->textLength();
TextRun run(constructTextRun(text, 0, 0, 0));
for (unsigned position = 0; position < length; ) {
run.setText(characters + position, 1);
SVGTextMetrics metrics(font, run, position, text->textLength());
allMetrics.append(metrics);
position += metrics.length();
}
}
}
#endif // ENABLE(SVG)
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