--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/svg/SVGFontFaceElement.cpp Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,350 @@
+/*
+ Copyright (C) 2007 Eric Seidel <eric@webkit.org>
+ Copyright (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
+ Copyright (C) 2008 Apple Inc. 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_FONTS)
+#include "SVGFontFaceElement.h"
+
+#include "Attribute.h"
+#include "CSSFontFaceRule.h"
+#include "CSSFontFaceSrcValue.h"
+#include "CSSParser.h"
+#include "CSSProperty.h"
+#include "CSSPropertyNames.h"
+#include "CSSStyleSelector.h"
+#include "CSSStyleSheet.h"
+#include "CSSValueKeywords.h"
+#include "CSSValueList.h"
+#include "Document.h"
+#include "Font.h"
+#include "SVGFontElement.h"
+#include "SVGFontFaceSrcElement.h"
+#include "SVGGlyphElement.h"
+#include "SVGNames.h"
+#include <math.h>
+
+namespace WebCore {
+
+using namespace SVGNames;
+
+SVGFontFaceElement::SVGFontFaceElement(const QualifiedName& tagName, Document* doc)
+ : SVGElement(tagName, doc)
+ , m_fontFaceRule(CSSFontFaceRule::create())
+ , m_styleDeclaration(CSSMutableStyleDeclaration::create())
+{
+ m_styleDeclaration->setParent(document()->mappedElementSheet());
+ m_styleDeclaration->setStrictParsing(true);
+ m_fontFaceRule->setDeclaration(m_styleDeclaration.get());
+}
+
+SVGFontFaceElement::~SVGFontFaceElement()
+{
+}
+
+static int cssPropertyIdForSVGAttributeName(const QualifiedName& attrName)
+{
+ if (!attrName.namespaceURI().isNull())
+ return 0;
+
+ static HashMap<AtomicStringImpl*, int>* propertyNameToIdMap = 0;
+ if (!propertyNameToIdMap) {
+ propertyNameToIdMap = new HashMap<AtomicStringImpl*, int>;
+ // This is a list of all @font-face CSS properties which are exposed as SVG XML attributes
+ // Those commented out are not yet supported by WebCore's style system
+ //mapAttributeToCSSProperty(propertyNameToIdMap, accent_heightAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, alphabeticAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, ascentAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, bboxAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, cap_heightAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, descentAttr);
+ mapAttributeToCSSProperty(propertyNameToIdMap, font_familyAttr);
+ mapAttributeToCSSProperty(propertyNameToIdMap, font_sizeAttr);
+ mapAttributeToCSSProperty(propertyNameToIdMap, font_stretchAttr);
+ mapAttributeToCSSProperty(propertyNameToIdMap, font_styleAttr);
+ mapAttributeToCSSProperty(propertyNameToIdMap, font_variantAttr);
+ mapAttributeToCSSProperty(propertyNameToIdMap, font_weightAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, hangingAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, ideographicAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, mathematicalAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, overline_positionAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, overline_thicknessAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, panose_1Attr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, slopeAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, stemhAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, stemvAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, strikethrough_positionAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, strikethrough_thicknessAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, underline_positionAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, underline_thicknessAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, unicode_rangeAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, units_per_emAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, v_alphabeticAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, v_hangingAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, v_ideographicAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, v_mathematicalAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, widthsAttr);
+ //mapAttributeToCSSProperty(propertyNameToIdMap, x_heightAttr);
+ }
+
+ return propertyNameToIdMap->get(attrName.localName().impl());
+}
+
+void SVGFontFaceElement::parseMappedAttribute(Attribute* attr)
+{
+ int propId = cssPropertyIdForSVGAttributeName(attr->name());
+ if (propId > 0) {
+ m_styleDeclaration->setProperty(propId, attr->value(), false);
+ if (inDocument())
+ rebuildFontFace();
+ return;
+ }
+
+ SVGElement::parseMappedAttribute(attr);
+}
+
+unsigned SVGFontFaceElement::unitsPerEm() const
+{
+ const AtomicString& value = getAttribute(units_per_emAttr);
+ if (value.isEmpty())
+ return defaultUnitsPerEm;
+
+ return static_cast<unsigned>(ceilf(value.toFloat()));
+}
+
+int SVGFontFaceElement::xHeight() const
+{
+ return static_cast<int>(ceilf(getAttribute(x_heightAttr).toFloat()));
+}
+
+float SVGFontFaceElement::horizontalOriginX() const
+{
+ if (!m_fontElement)
+ return 0.0f;
+
+ // Spec: The X-coordinate in the font coordinate system of the origin of a glyph to be used when
+ // drawing horizontally oriented text. (Note that the origin applies to all glyphs in the font.)
+ // If the attribute is not specified, the effect is as if a value of "0" were specified.
+ return m_fontElement->getAttribute(horiz_origin_xAttr).toFloat();
+}
+
+float SVGFontFaceElement::horizontalOriginY() const
+{
+ if (!m_fontElement)
+ return 0.0f;
+
+ // Spec: The Y-coordinate in the font coordinate system of the origin of a glyph to be used when
+ // drawing horizontally oriented text. (Note that the origin applies to all glyphs in the font.)
+ // If the attribute is not specified, the effect is as if a value of "0" were specified.
+ return m_fontElement->getAttribute(horiz_origin_yAttr).toFloat();
+}
+
+float SVGFontFaceElement::horizontalAdvanceX() const
+{
+ if (!m_fontElement)
+ return 0.0f;
+
+ // Spec: The default horizontal advance after rendering a glyph in horizontal orientation. Glyph
+ // widths are required to be non-negative, even if the glyph is typically rendered right-to-left,
+ // as in Hebrew and Arabic scripts.
+ return m_fontElement->getAttribute(horiz_adv_xAttr).toFloat();
+}
+
+float SVGFontFaceElement::verticalOriginX() const
+{
+ if (!m_fontElement)
+ return 0.0f;
+
+ // Spec: The default X-coordinate in the font coordinate system of the origin of a glyph to be used when
+ // drawing vertically oriented text. If the attribute is not specified, the effect is as if the attribute
+ // were set to half of the effective value of attribute horiz-adv-x.
+ const AtomicString& value = m_fontElement->getAttribute(vert_origin_xAttr);
+ if (value.isEmpty())
+ return horizontalAdvanceX() / 2.0f;
+
+ return value.toFloat();
+}
+
+float SVGFontFaceElement::verticalOriginY() const
+{
+ if (!m_fontElement)
+ return 0.0f;
+
+ // Spec: The default Y-coordinate in the font coordinate system of the origin of a glyph to be used when
+ // drawing vertically oriented text. If the attribute is not specified, the effect is as if the attribute
+ // were set to the position specified by the font's ascent attribute.
+ const AtomicString& value = m_fontElement->getAttribute(vert_origin_yAttr);
+ if (value.isEmpty())
+ return ascent();
+
+ return value.toFloat();
+}
+
+float SVGFontFaceElement::verticalAdvanceY() const
+{
+ if (!m_fontElement)
+ return 0.0f;
+
+ // Spec: The default vertical advance after rendering a glyph in vertical orientation. If the attribute is
+ // not specified, the effect is as if a value equivalent of one em were specified (see units-per-em).
+ const AtomicString& value = m_fontElement->getAttribute(vert_adv_yAttr);
+ if (value.isEmpty())
+ return 1.0f;
+
+ return value.toFloat();
+}
+
+int SVGFontFaceElement::ascent() const
+{
+ // Spec: Same syntax and semantics as the 'ascent' descriptor within an @font-face rule. The maximum
+ // unaccented height of the font within the font coordinate system. If the attribute is not specified,
+ // the effect is as if the attribute were set to the difference between the units-per-em value and the
+ // vert-origin-y value for the corresponding font.
+ const AtomicString& ascentValue = getAttribute(ascentAttr);
+ if (!ascentValue.isEmpty())
+ return static_cast<int>(ceilf(ascentValue.toFloat()));
+
+ if (m_fontElement) {
+ const AtomicString& vertOriginY = m_fontElement->getAttribute(vert_origin_yAttr);
+ if (!vertOriginY.isEmpty())
+ return static_cast<int>(unitsPerEm()) - static_cast<int>(ceilf(vertOriginY.toFloat()));
+ }
+
+ // Match Batiks default value
+ return static_cast<int>(ceilf(unitsPerEm() * 0.8f));
+}
+
+int SVGFontFaceElement::descent() const
+{
+ // Spec: Same syntax and semantics as the 'descent' descriptor within an @font-face rule. The maximum
+ // unaccented depth of the font within the font coordinate system. If the attribute is not specified,
+ // the effect is as if the attribute were set to the vert-origin-y value for the corresponding font.
+ const AtomicString& descentValue = getAttribute(descentAttr);
+ if (!descentValue.isEmpty()) {
+ // 14 different W3C SVG 1.1 testcases use a negative descent value,
+ // where a positive was meant to be used Including:
+ // animate-elem-24-t.svg, fonts-elem-01-t.svg, fonts-elem-02-t.svg (and 11 others)
+ int descent = static_cast<int>(ceilf(descentValue.toFloat()));
+ return descent < 0 ? -descent : descent;
+ }
+
+ if (m_fontElement) {
+ const AtomicString& vertOriginY = m_fontElement->getAttribute(vert_origin_yAttr);
+ if (!vertOriginY.isEmpty())
+ return static_cast<int>(ceilf(vertOriginY.toFloat()));
+ }
+
+ // Match Batiks default value
+ return static_cast<int>(ceilf(unitsPerEm() * 0.2f));
+}
+
+String SVGFontFaceElement::fontFamily() const
+{
+ return m_styleDeclaration->getPropertyValue(CSSPropertyFontFamily);
+}
+
+void SVGFontFaceElement::rebuildFontFace()
+{
+ ASSERT(inDocument());
+
+ // we currently ignore all but the first src element, alternatively we could concat them
+ SVGFontFaceSrcElement* srcElement = 0;
+
+ for (Node* child = firstChild(); child && !srcElement; child = child->nextSibling()) {
+ if (child->hasTagName(font_face_srcTag))
+ srcElement = static_cast<SVGFontFaceSrcElement*>(child);
+ }
+
+ bool describesParentFont = parentNode()->hasTagName(SVGNames::fontTag);
+ RefPtr<CSSValueList> list;
+
+ if (describesParentFont) {
+ m_fontElement = static_cast<SVGFontElement*>(parentNode());
+
+ list = CSSValueList::createCommaSeparated();
+ list->append(CSSFontFaceSrcValue::createLocal(fontFamily()));
+ } else {
+ m_fontElement = 0;
+ if (srcElement)
+ list = srcElement->srcValue();
+ }
+
+ if (!list)
+ return;
+
+ // Parse in-memory CSS rules
+ CSSProperty srcProperty(CSSPropertySrc, list);
+ const CSSProperty* srcPropertyRef = &srcProperty;
+ m_styleDeclaration->addParsedProperties(&srcPropertyRef, 1);
+
+ if (describesParentFont) {
+ // Traverse parsed CSS values and associate CSSFontFaceSrcValue elements with ourselves.
+ RefPtr<CSSValue> src = m_styleDeclaration->getPropertyCSSValue(CSSPropertySrc);
+ CSSValueList* srcList = static_cast<CSSValueList*>(src.get());
+
+ unsigned srcLength = srcList ? srcList->length() : 0;
+ for (unsigned i = 0; i < srcLength; i++) {
+ if (CSSFontFaceSrcValue* item = static_cast<CSSFontFaceSrcValue*>(srcList->itemWithoutBoundsCheck(i)))
+ item->setSVGFontFaceElement(this);
+ }
+ }
+
+ document()->updateStyleSelector();
+}
+
+void SVGFontFaceElement::insertedIntoDocument()
+{
+ SVGElement::insertedIntoDocument();
+ document()->mappedElementSheet()->append(m_fontFaceRule);
+ rebuildFontFace();
+}
+
+void SVGFontFaceElement::removedFromDocument()
+{
+ removeFromMappedElementSheet();
+ SVGElement::removedFromDocument();
+}
+
+void SVGFontFaceElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
+{
+ SVGElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
+ if (inDocument())
+ rebuildFontFace();
+}
+
+void SVGFontFaceElement::removeFromMappedElementSheet()
+{
+ CSSStyleSheet* mappedElementSheet = document()->mappedElementSheet();
+ if (!mappedElementSheet)
+ return;
+
+ for (unsigned i = 0; i < mappedElementSheet->length(); ++i) {
+ if (mappedElementSheet->item(i) == m_fontFaceRule) {
+ mappedElementSheet->remove(i);
+ break;
+ }
+ }
+ document()->updateStyleSelector();
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(SVG_FONTS)