SimpleFontData.cpp [plain text]
#include "config.h"
#include "SimpleFontData.h"
#include "Font.h"
#include "FontCache.h"
#if ENABLE(SVG_FONTS)
#include "SVGFontData.h"
#include "SVGFontElement.h"
#include "SVGFontFaceElement.h"
#include "SVGGlyphElement.h"
#endif
#include <wtf/MathExtras.h>
#include <wtf/UnusedParam.h>
using namespace std;
namespace WebCore {
SimpleFontData::SimpleFontData(const FontPlatformData& platformData, bool isCustomFont, bool isLoading, bool isTextOrientationFallback)
: m_maxCharWidth(-1)
, m_avgCharWidth(-1)
, m_platformData(platformData)
, m_treatAsFixedPitch(false)
, m_isCustomFont(isCustomFont)
, m_isLoading(isLoading)
, m_isTextOrientationFallback(isTextOrientationFallback)
, m_isBrokenIdeographFallback(false)
, m_hasVerticalGlyphs(false)
{
platformInit();
platformGlyphInit();
platformCharWidthInit();
}
#if ENABLE(SVG_FONTS)
SimpleFontData::SimpleFontData(PassOwnPtr<SVGFontData> svgFontData, int size, bool syntheticBold, bool syntheticItalic)
: m_platformData(FontPlatformData(size, syntheticBold, syntheticItalic))
, m_treatAsFixedPitch(false)
, m_svgFontData(svgFontData)
, m_isCustomFont(true)
, m_isLoading(false)
, m_isTextOrientationFallback(false)
, m_isBrokenIdeographFallback(false)
, m_hasVerticalGlyphs(false)
{
SVGFontFaceElement* svgFontFaceElement = m_svgFontData->svgFontFaceElement();
unsigned unitsPerEm = svgFontFaceElement->unitsPerEm();
float scale = size;
if (unitsPerEm)
scale /= unitsPerEm;
float xHeight = svgFontFaceElement->xHeight() * scale;
float ascent = svgFontFaceElement->ascent() * scale;
float descent = svgFontFaceElement->descent() * scale;
float lineGap = 0.1f * size;
SVGFontElement* associatedFontElement = svgFontFaceElement->associatedFontElement();
if (!xHeight) {
Vector<SVGGlyph> letterXGlyphs;
associatedFontElement->getGlyphIdentifiersForString(String("x", 1), letterXGlyphs);
xHeight = letterXGlyphs.isEmpty() ? 2 * ascent / 3 : letterXGlyphs.first().horizontalAdvanceX * scale;
}
m_fontMetrics.setUnitsPerEm(unitsPerEm);
m_fontMetrics.setAscent(ascent);
m_fontMetrics.setDescent(descent);
m_fontMetrics.setLineGap(lineGap);
m_fontMetrics.setLineSpacing(roundf(ascent) + roundf(descent) + roundf(lineGap));
m_fontMetrics.setXHeight(xHeight);
Vector<SVGGlyph> spaceGlyphs;
associatedFontElement->getGlyphIdentifiersForString(String(" ", 1), spaceGlyphs);
m_spaceWidth = spaceGlyphs.isEmpty() ? xHeight : spaceGlyphs.first().horizontalAdvanceX * scale;
Vector<SVGGlyph> numeralZeroGlyphs;
associatedFontElement->getGlyphIdentifiersForString(String("0", 1), numeralZeroGlyphs);
m_avgCharWidth = numeralZeroGlyphs.isEmpty() ? m_spaceWidth : numeralZeroGlyphs.first().horizontalAdvanceX * scale;
Vector<SVGGlyph> letterWGlyphs;
associatedFontElement->getGlyphIdentifiersForString(String("W", 1), letterWGlyphs);
m_maxCharWidth = letterWGlyphs.isEmpty() ? ascent : letterWGlyphs.first().horizontalAdvanceX * scale;
m_spaceGlyph = 0;
m_zeroWidthSpaceGlyph = 0;
determinePitch();
m_missingGlyphData.fontData = this;
m_missingGlyphData.glyph = 0;
}
#endif
#if !(PLATFORM(QT) && !HAVE(QRAWFONT))
void SimpleFontData::initCharWidths()
{
GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
if (m_avgCharWidth <= 0.f && glyphPageZero) {
static const UChar32 digitZeroChar = '0';
Glyph digitZeroGlyph = glyphPageZero->glyphDataForCharacter(digitZeroChar).glyph;
if (digitZeroGlyph)
m_avgCharWidth = widthForGlyph(digitZeroGlyph);
}
if (m_avgCharWidth <= 0.f)
m_avgCharWidth = m_fontMetrics.xHeight();
if (m_maxCharWidth <= 0.f)
m_maxCharWidth = max(m_avgCharWidth, m_fontMetrics.floatAscent());
}
void SimpleFontData::platformGlyphInit()
{
GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
if (!glyphPageZero) {
LOG_ERROR("Failed to get glyph page zero.");
m_spaceGlyph = 0;
m_spaceWidth = 0;
m_adjustedSpaceWidth = 0;
determinePitch();
m_zeroWidthSpaceGlyph = 0;
m_missingGlyphData.fontData = this;
m_missingGlyphData.glyph = 0;
return;
}
m_zeroWidthSpaceGlyph = glyphPageZero->glyphDataForCharacter(0).glyph;
m_spaceGlyph = glyphPageZero->glyphDataForCharacter(' ').glyph;
float width = widthForGlyph(m_spaceGlyph);
m_spaceWidth = width;
determinePitch();
m_adjustedSpaceWidth = m_treatAsFixedPitch ? ceilf(width) : roundf(width);
if (m_zeroWidthSpaceGlyph == m_spaceGlyph) {
m_zeroWidthSpaceGlyph = 0;
LOG_ERROR("Font maps SPACE and ZERO WIDTH SPACE to the same glyph. Glyph width will not be overridden.");
}
m_missingGlyphData.fontData = this;
m_missingGlyphData.glyph = 0;
}
#endif
SimpleFontData::~SimpleFontData()
{
#if ENABLE(SVG_FONTS)
if (!m_svgFontData || !m_svgFontData->svgFontFaceElement())
#endif
platformDestroy();
if (!isCustomFont())
GlyphPageTreeNode::pruneTreeFontData(this);
}
const SimpleFontData* SimpleFontData::fontDataForCharacter(UChar32) const
{
return this;
}
bool SimpleFontData::isSegmented() const
{
return false;
}
SimpleFontData* SimpleFontData::verticalRightOrientationFontData() const
{
if (!m_derivedFontData)
m_derivedFontData = DerivedFontData::create(isCustomFont());
if (!m_derivedFontData->verticalRightOrientation) {
FontPlatformData verticalRightPlatformData(m_platformData);
verticalRightPlatformData.setOrientation(Horizontal);
m_derivedFontData->verticalRightOrientation = adoptPtr(new SimpleFontData(verticalRightPlatformData, isCustomFont(), false, true));
}
return m_derivedFontData->verticalRightOrientation.get();
}
SimpleFontData* SimpleFontData::uprightOrientationFontData() const
{
if (!m_derivedFontData)
m_derivedFontData = DerivedFontData::create(isCustomFont());
if (!m_derivedFontData->uprightOrientation)
m_derivedFontData->uprightOrientation = adoptPtr(new SimpleFontData(m_platformData, isCustomFont(), false, true));
return m_derivedFontData->uprightOrientation.get();
}
SimpleFontData* SimpleFontData::brokenIdeographFontData() const
{
if (!m_derivedFontData)
m_derivedFontData = DerivedFontData::create(isCustomFont());
if (!m_derivedFontData->brokenIdeograph) {
m_derivedFontData->brokenIdeograph = adoptPtr(new SimpleFontData(m_platformData, isCustomFont(), false));
m_derivedFontData->brokenIdeograph->m_isBrokenIdeographFallback = true;
}
return m_derivedFontData->brokenIdeograph.get();
}
#ifndef NDEBUG
String SimpleFontData::description() const
{
if (isSVGFont())
return "[SVG font]";
if (isCustomFont())
return "[custom font]";
return platformData().description();
}
#endif
PassOwnPtr<SimpleFontData::DerivedFontData> SimpleFontData::DerivedFontData::create(bool forCustomFont)
{
return adoptPtr(new DerivedFontData(forCustomFont));
}
SimpleFontData::DerivedFontData::~DerivedFontData()
{
if (!forCustomFont)
return;
if (smallCaps)
GlyphPageTreeNode::pruneTreeCustomFontData(smallCaps.get());
if (emphasisMark)
GlyphPageTreeNode::pruneTreeCustomFontData(emphasisMark.get());
if (brokenIdeograph)
GlyphPageTreeNode::pruneTreeCustomFontData(brokenIdeograph.get());
if (verticalRightOrientation)
GlyphPageTreeNode::pruneTreeCustomFontData(verticalRightOrientation.get());
if (uprightOrientation)
GlyphPageTreeNode::pruneTreeCustomFontData(uprightOrientation.get());
}
}