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/*
Copyright (C) 2007 Eric Seidel <eric@webkit.org>
Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
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_FONTS)
#include "SVGFontElement.h"
#include "Document.h"
#include "Font.h"
#include "GlyphPageTreeNode.h"
#include "SVGGlyphElement.h"
#include "SVGMissingGlyphElement.h"
#include "SVGNames.h"
#include "SVGParserUtilities.h"
#include <wtf/ASCIICType.h>
using namespace WTF;
namespace WebCore {
using namespace SVGNames;
SVGFontElement::SVGFontElement(const QualifiedName& tagName, Document* doc)
: SVGStyledElement(tagName, doc)
, m_isGlyphCacheValid(false)
{
}
SVGFontElement::~SVGFontElement()
{
}
void SVGFontElement::invalidateGlyphCache()
{
if (m_isGlyphCacheValid) {
m_glyphMap.clear();
m_kerningPairs.clear();
}
m_isGlyphCacheValid = false;
}
SVGMissingGlyphElement* SVGFontElement::firstMissingGlyphElement() const
{
for (Node* child = firstChild(); child; child = child->nextSibling()) {
if (child->hasTagName(missing_glyphTag))
return static_cast<SVGMissingGlyphElement*>(child);
}
return 0;
}
void SVGFontElement::ensureGlyphCache() const
{
if (m_isGlyphCacheValid)
return;
for (Node* child = firstChild(); child; child = child->nextSibling()) {
if (child->hasTagName(glyphTag)) {
SVGGlyphElement* glyph = static_cast<SVGGlyphElement*>(child);
String unicode = glyph->getAttribute(unicodeAttr);
if (unicode.length())
m_glyphMap.add(unicode, glyph->buildGlyphIdentifier());
} else if (child->hasTagName(hkernTag)) {
SVGHKernElement* hkern = static_cast<SVGHKernElement*>(child);
SVGHorizontalKerningPair kerningPair = hkern->buildHorizontalKerningPair();
m_kerningPairs.append(kerningPair);
}
}
m_isGlyphCacheValid = true;
}
// Returns the number of characters consumed or 0 if no range was found.
static unsigned parseUnicodeRange(const UChar* characters, unsigned length, pair<unsigned, unsigned>& range)
{
if (length < 2)
return 0;
if (characters[0] != 'U')
return 0;
if (characters[1] != '+')
return 0;
// Parse the starting hex number (or its prefix).
unsigned start = 0;
unsigned startLength = 0;
for (unsigned i = 2; i < length; ++i) {
if (!isASCIIHexDigit(characters[i]))
break;
if (++startLength > 6)
return 0;
start = (start << 4) | toASCIIHexValue(characters[i]);
}
// Handle the case of ranges separated by "-" sign.
if (2 + startLength < length && characters[2 + startLength] == '-') {
if (!startLength)
return 0;
// Parse the ending hex number (or its prefix).
unsigned end = 0;
unsigned endLength = 0;
for (unsigned i = 2 + startLength + 1; i < length; ++i) {
if (!isASCIIHexDigit(characters[i]))
break;
if (++endLength > 6)
return 0;
end = (end << 4) | toASCIIHexValue(characters[i]);
}
if (!endLength)
return 0;
range.first = start;
range.second = end;
return 2 + startLength + 1 + endLength;
}
// Handle the case of a number with some optional trailing question marks.
unsigned end = start;
for (unsigned i = 2 + startLength; i < length; ++i) {
if (characters[i] != '?')
break;
if (++startLength > 6)
return 0;
start <<= 4;
end = (end << 4) | 0xF;
}
if (!startLength)
return 0;
range.first = start;
range.second = end;
return 2 + startLength;
}
static bool parseUnicodeRangeList(const UChar* characters, unsigned length, Vector<pair<unsigned, unsigned> >& ranges)
{
ranges.clear();
if (!length)
return true;
const UChar* remainingCharacters = characters;
unsigned remainingLength = length;
while (1) {
pair<unsigned, unsigned> range;
unsigned charactersConsumed = parseUnicodeRange(remainingCharacters, remainingLength, range);
if (charactersConsumed) {
ranges.append(range);
remainingCharacters += charactersConsumed;
remainingLength -= charactersConsumed;
} else {
if (!remainingLength)
return false;
UChar character = remainingCharacters[0];
if (character == ',')
return false;
ranges.append(make_pair(character, character));
++remainingCharacters;
--remainingLength;
}
if (!remainingLength)
return true;
if (remainingCharacters[0] != ',')
return false;
++remainingCharacters;
--remainingLength;
}
}
static bool stringMatchesUnicodeRange(const String& unicodeString, const String& unicodeRangeSpec)
{
Vector<pair<unsigned, unsigned> > ranges;
if (!parseUnicodeRangeList(unicodeRangeSpec.characters(), unicodeRangeSpec.length(), ranges))
return false;
if (unicodeString.length() != ranges.size())
return false;
for (size_t i = 0; i < unicodeString.length(); ++i) {
UChar c = unicodeString[i];
if (c < ranges[i].first || c > ranges[i].second)
return false;
}
return true;
}
static bool matches(const String& u1, const String& g1, const String& u2, const String& g2, const SVGHorizontalKerningPair& kerningPair)
{
if (kerningPair.unicode1.length() && !stringMatchesUnicodeRange(u1, kerningPair.unicode1))
return false;
if (kerningPair.glyphName1.length() && kerningPair.glyphName1 != g1)
return false;
if (kerningPair.unicode2.length() && !stringMatchesUnicodeRange(u2, kerningPair.unicode2))
return false;
if (kerningPair.glyphName2.length() && kerningPair.glyphName2 != g2)
return false;
return true;
}
bool SVGFontElement::getHorizontalKerningPairForStringsAndGlyphs(const String& u1, const String& g1, const String& u2, const String& g2, SVGHorizontalKerningPair& kerningPair) const
{
for (size_t i = 0; i < m_kerningPairs.size(); ++i) {
if (matches(u1, g1, u2, g2, m_kerningPairs[i])) {
kerningPair = m_kerningPairs[i];
return true;
}
}
return false;
}
void SVGFontElement::getGlyphIdentifiersForString(const String& string, Vector<SVGGlyphIdentifier>& glyphs) const
{
ensureGlyphCache();
m_glyphMap.get(string, glyphs);
}
}
#endif // ENABLE(SVG_FONTS)
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