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/*
* Copyright (C) Research In Motion Limited 2010-2012. 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 "core/rendering/svg/SVGTextMetrics.h"
#include "core/rendering/svg/RenderSVGInlineText.h"
#include "core/rendering/svg/SVGTextRunRenderingContext.h"
namespace WebCore {
SVGTextMetrics::SVGTextMetrics()
: m_width(0)
, m_height(0)
, m_length(0)
{
}
SVGTextMetrics::SVGTextMetrics(SVGTextMetrics::MetricsType)
: m_width(0)
, m_height(0)
, m_length(1)
{
}
SVGTextMetrics::SVGTextMetrics(RenderSVGInlineText* textRenderer, const TextRun& run)
{
ASSERT(textRenderer);
float scalingFactor = textRenderer->scalingFactor();
ASSERT(scalingFactor);
const Font& scaledFont = textRenderer->scaledFont();
int length = 0;
// Calculate width/height using the scaled font, divide this result by the scalingFactor afterwards.
m_width = scaledFont.width(run, length, m_glyph.name) / scalingFactor;
m_height = scaledFont.fontMetrics().floatHeight() / scalingFactor;
m_glyph.unicodeString = run.is8Bit() ? String(run.characters8(), length) : String(run.characters16(), length);
m_glyph.isValid = true;
ASSERT(length >= 0);
m_length = static_cast<unsigned>(length);
}
TextRun SVGTextMetrics::constructTextRun(RenderSVGInlineText* text, unsigned position, unsigned length)
{
RenderStyle* style = text->style();
ASSERT(style);
TextRun run(static_cast<const LChar*>(0) // characters, will be set below if non-zero.
, 0 // length, will be set below if non-zero.
, 0 // xPos, only relevant with allowTabs=true
, 0 // padding, only relevant for justified text, not relevant for SVG
, TextRun::AllowTrailingExpansion
, style->direction()
, isOverride(style->unicodeBidi()) /* directionalOverride */);
if (length) {
if (text->is8Bit())
run.setText(text->characters8() + position, length);
else
run.setText(text->characters16() + position, length);
}
if (textRunNeedsRenderingContext(style->font()))
run.setRenderingContext(SVGTextRunRenderingContext::create(text));
run.disableRoundingHacks();
// We handle letter & word spacing ourselves.
run.disableSpacing();
// Propagate the maximum length of the characters buffer to the TextRun, even when we're only processing a substring.
run.setCharactersLength(text->textLength() - position);
ASSERT(run.charactersLength() >= run.length());
return run;
}
SVGTextMetrics SVGTextMetrics::measureCharacterRange(RenderSVGInlineText* text, unsigned position, unsigned length)
{
ASSERT(text);
return SVGTextMetrics(text, constructTextRun(text, position, length));
}
SVGTextMetrics::SVGTextMetrics(RenderSVGInlineText* text, unsigned position, unsigned length, float width, const String& glyphName)
{
ASSERT(text);
bool needsContext = textRunNeedsRenderingContext(text->style()->font());
float scalingFactor = text->scalingFactor();
ASSERT(scalingFactor);
m_width = width / scalingFactor;
m_height = text->scaledFont().fontMetrics().floatHeight() / scalingFactor;
if (needsContext) {
m_glyph.isValid = true;
m_glyph.unicodeString = text->substring(position, length);
m_glyph.name = glyphName;
}
m_length = length;
}
}
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