SVGTextMetrics.cpp [plain text]
#include "config.h"
#include "SVGTextMetrics.h"
#include "RenderSVGInlineText.h"
#include "WidthIterator.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)
{
float scalingFactor = textRenderer.scalingFactor();
ASSERT(scalingFactor);
const FontCascade& scaledFont = textRenderer.scaledFont();
int length = 0;
m_width = scaledFont.width(run) / scalingFactor;
length = run.length();
m_glyph.name = emptyString();
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)
{
const RenderStyle& style = text.style();
TextRun run(StringView(text.text()).substring(position, length)
, 0
, 0
, AllowTrailingExpansion
, style.direction()
, isOverride(style.unicodeBidi()) );
run.disableSpacing();
run.setCharactersLength(text.textLength() - position);
ASSERT(run.charactersLength() >= run.length());
return run;
}
SVGTextMetrics SVGTextMetrics::measureCharacterRange(RenderSVGInlineText& text, unsigned position, unsigned length)
{
return SVGTextMetrics(text, constructTextRun(text, position, length));
}
SVGTextMetrics::SVGTextMetrics(RenderSVGInlineText& text, unsigned length, float width)
{
float scalingFactor = text.scalingFactor();
ASSERT(scalingFactor);
m_width = width / scalingFactor;
m_height = text.scaledFont().fontMetrics().floatHeight() / scalingFactor;
m_length = length;
}
}