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Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-1.5/src/SVGTree.cpp')
-rw-r--r-- | Build/source/texk/dvisvgm/dvisvgm-1.5/src/SVGTree.cpp | 430 |
1 files changed, 430 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.5/src/SVGTree.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.5/src/SVGTree.cpp new file mode 100644 index 00000000000..626d81da133 --- /dev/null +++ b/Build/source/texk/dvisvgm/dvisvgm-1.5/src/SVGTree.cpp @@ -0,0 +1,430 @@ +/************************************************************************* +** SVGTree.cpp ** +** ** +** This file is part of dvisvgm -- the DVI to SVG converter ** +** Copyright (C) 2005-2013 Martin Gieseking <martin.gieseking@uos.de> ** +** ** +** This program is free software; you can redistribute it and/or ** +** modify it under the terms of the GNU General Public License as ** +** published by the Free Software Foundation; either version 3 of ** +** the License, or (at your option) any later version. ** +** ** +** This program 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 General Public License for more details. ** +** ** +** You should have received a copy of the GNU General Public License ** +** along with this program; if not, see <http://www.gnu.org/licenses/>. ** +*************************************************************************/ + +#include <config.h> +#include <algorithm> +#include <sstream> +#include <string> +#include "BoundingBox.h" +#include "DVIToSVG.h" +#include "Font.h" +#include "FontManager.h" +#include "SVGTree.h" +#include "XMLDocument.h" +#include "XMLNode.h" +#include "XMLString.h" + +using namespace std; + + +// static class variables +bool SVGTree::CREATE_STYLE=true; +bool SVGTree::USE_FONTS=true; +bool SVGTree::CREATE_USE_ELEMENTS=false; + + +SVGTree::SVGTree () : _vertical(false), _font(0), _color(Color::BLACK), _matrix(1) { + _xchanged = _ychanged = false; + _fontnum = 0; + reset(); +} + + +/** Clears the SVG tree and initializes the root element. */ +void SVGTree::reset () { + _doc.clear(); + _root = new XMLElementNode("svg"); + _root->addAttribute("version", "1.1"); + _root->addAttribute("xmlns", "http://www.w3.org/2000/svg"); + _root->addAttribute("xmlns:xlink", "http://www.w3.org/1999/xlink"); + _doc.setRootNode(_root); + _page = _text = _span = _defs = 0; +} + + +/** Sets the bounding box of the document. + * @param[in] bbox bounding box in TeX point units */ +void SVGTree::setBBox (const BoundingBox &bbox) { + double bp = 72.0/72.27; // pt -> bp + ScalingMatrix scale(bp, bp); + BoundingBox scaled_box = bbox; + scaled_box.transform(scale); + _root->addAttribute("width", XMLString(scaled_box.width())+"pt"); + _root->addAttribute("height", XMLString(scaled_box.height())+"pt"); + _root->addAttribute("viewBox", scaled_box.toSVGViewBox()); +} + + +/** Starts a new page. + * @param[in] pageno number of new page */ +void SVGTree::newPage (int pageno) { + _page = new XMLElementNode("g"); + if (pageno >= 0) + _page->addAttribute("id", string("page")+XMLString(pageno)); + _root->append(_page); + _text = _span = 0; + while (!_pageContainerStack.empty()) + _pageContainerStack.pop(); +} + + +void SVGTree::appendToDefs (XMLNode *node) { + if (!_defs) { + _defs = new XMLElementNode("defs"); + _root->prepend(_defs); + } + _defs->append(node); +} + + +void SVGTree::appendToPage (XMLNode *node) { + if (_pageContainerStack.empty()) + _page->append(node); + else + _pageContainerStack.top()->append(node); +} + + +void SVGTree::prependToPage (XMLNode *node) { + if (_pageContainerStack.empty()) + _page->prepend(node); + else + _pageContainerStack.top()->prepend(node); +} + + +/** Appends a single charater to the current text node. If necessary, and depending on output mode + * and further output states, new XML elements (text, tspan, g, ...) are created. + * @param[in] c character to be added + * @param[in] x x coordinate + * @param[in] y y coordinate + * @param[in] font font to be used */ +void SVGTree::appendChar (int c, double x, double y, const Font &font) { + XMLElementNode *node=_span; + if (USE_FONTS) { + // changes of fonts and transformations require a new text element + if (!_text || _font.changed() || _matrix.changed() || _vertical.changed()) { + newTextNode(x, y); + node = _text; + _color.changed(true); + } + if (_xchanged || _ychanged || (_color.changed() && _color.get() != Color::BLACK)) { + // if drawing position was explicitly changed, create a new tspan element + _span = new XMLElementNode("tspan"); + if (_xchanged) { + if (_vertical) { + // align glyphs designed for horizontal layout properly + if (const PhysicalFont *pf = dynamic_cast<const PhysicalFont*>(_font.get())) + if (!pf->getMetrics()->verticalLayout()) + x += pf->scaledAscent()/2.5; // move vertical baseline to the right by strikethrough offset + } + _span->addAttribute("x", x); + _xchanged = false; + } + if (_ychanged) { + _span->addAttribute("y", y); + _ychanged = false; + } + if (_color.get() != Color::BLACK) { + _span->addAttribute("fill", _color.get().rgbString()); + _color.changed(false); + } + _text->append(_span); + node = _span; + } + if (!node) { + if (!_text) + newTextNode(x, y); + node = _text; + } + node->append(XMLString(font.unicode(c), false)); + } + else { + if (_color.changed() || _matrix.changed()) { + bool set_color = (_color.changed() && _color.get() != Color::BLACK); + bool set_matrix = (_matrix.changed() && !_matrix.get().isIdentity()); + if (set_color || set_matrix) { + _span = new XMLElementNode("g"); + if (_color.get() != Color::BLACK) + _span->addAttribute("fill", _color.get().rgbString()); + if (!_matrix.get().isIdentity()) + _span->addAttribute("transform", _matrix.get().getSVG()); + appendToPage(_span); + node = _span; + _color.changed(false); + _matrix.changed(false); + } + else if (_color.get() == Color::BLACK && _matrix.get().isIdentity()) + node = _span = 0; + } + if (!node) + node = _pageContainerStack.empty() ? _page : _pageContainerStack.top(); + if (font.verticalLayout()) { + // move glyph graphics so that its origin is located at the top center position + GlyphMetrics metrics; + font.getGlyphMetrics(c, _vertical, metrics); + x -= metrics.wl; + if (const PhysicalFont *pf = dynamic_cast<const PhysicalFont*>(&font)) { + // Center glyph between top and bottom border of the TFM box. + // This is just an approximation used until I find a way to compute + // the exact location in vertical mode. + GlyphMetrics exact_metrics; + pf->getExactGlyphBox(c, exact_metrics, false); + y += exact_metrics.h+(metrics.d-exact_metrics.h-exact_metrics.d)/2; + } + else + y += metrics.d; + } + Matrix rotation(1); + if (_vertical && !font.verticalLayout()) { + // alphabetic text designed for horizontal mode + // must be rotated by 90 degrees if in vertical mode + rotation.translate(-x, -y); + rotation.rotate(90); + rotation.translate(x, y); + } + if (CREATE_USE_ELEMENTS) { + ostringstream oss; + oss << "#g" << FontManager::instance().fontID(_font) << '-' << c; + XMLElementNode *use = new XMLElementNode("use"); + use->addAttribute("x", XMLString(x)); + use->addAttribute("y", XMLString(y)); + use->addAttribute("xlink:href", oss.str()); + if (!rotation.isIdentity()) + use->addAttribute("transform", rotation.getSVG()); + node->append(use); + } + else { + Glyph glyph; + const PhysicalFont *pf = dynamic_cast<const PhysicalFont*>(&font); + if (pf && pf->getGlyph(c, glyph)) { + double sx = pf->scaledSize()/pf->unitsPerEm(); + double sy = -sx; + ostringstream oss; + glyph.writeSVG(oss, sx, sy, x, y); + XMLElementNode *glyph_node = new XMLElementNode("path"); + glyph_node->addAttribute("d", oss.str()); + if (!rotation.isIdentity()) + glyph_node->addAttribute("transform", rotation.getSVG()); + node->append(glyph_node); + } + } + } +} + + +/** Creates a new text element. This is a helper function used by appendChar(). + * @param[in] x current x coordinate + * @param[in] y current y coordinate */ +void SVGTree::newTextNode (double x, double y) { + _text = new XMLElementNode("text"); + _span = 0; // no tspan in text element yet + if (USE_FONTS) { + const Font *font = _font.get(); + if (CREATE_STYLE || !font) + _text->addAttribute("class", string("f")+XMLString(_fontnum)); + else { + _text->addAttribute("font-family", font->name()); + _text->addAttribute("font-size", font->scaledSize()); + if (font->color() != Color::BLACK) + _text->addAttribute("fill", font->color().rgbString()); + } + if (_vertical) { + _text->addAttribute("writing-mode", "tb"); + // align glyphs designed for horizontal layout properly + if (const PhysicalFont *pf = dynamic_cast<const PhysicalFont*>(_font.get())) + if (!pf->getMetrics()->verticalLayout()) { // alphabetic text designed for horizontal layout? + x += pf->scaledAscent()/2.5; // move vertical baseline to the right by strikethrough offset + _text->addAttribute("glyph-orientation-vertical", 90); // ensure rotation + } + } + } + _text->addAttribute("x", x); + _text->addAttribute("y", y); + if (!_matrix.get().isIdentity()) + _text->addAttribute("transform", _matrix.get().getSVG()); + appendToPage(_text); + _vertical.changed(false); + _font.changed(false); + _matrix.changed(false); + _xchanged = false; + _ychanged = false; +} + + +void SVGTree::setFont (int num, const Font *font) { + _font.set(font); + _fontnum = num; + // set default color assigned to the font + if (!USE_FONTS && _color.get() != font->color()) + setColor(font->color()); +} + + +void SVGTree::transformPage (const Matrix *usermatrix) { + double bp = 72.0/72.27; // pt -> bp + ScalingMatrix matrix(bp, bp); + if (usermatrix) + matrix.rmultiply(*usermatrix); + if (!matrix.isIdentity()) + _page->addAttribute("transform", matrix.getSVG()); +} + + +/** Creates an SVG element for a single glyph. + * @param[in] c character number + * @param[in] font font to extract the glyph from + * @return pointer to element node if glyph exists, 0 otherwise */ +static XMLElementNode* createGlyphNode (int c, const PhysicalFont &font, GFGlyphTracer::Callback *cb) { + Glyph glyph; + if (!font.getGlyph(c, glyph, cb) || (!SVGTree::USE_FONTS && !SVGTree::CREATE_USE_ELEMENTS)) + return 0; + + double sx=1.0, sy=1.0; + double upem = font.unitsPerEm(); + XMLElementNode *glyph_node=0; + if (SVGTree::USE_FONTS) { + double extend = font.style() ? font.style()->extend : 1; + glyph_node = new XMLElementNode("glyph"); + glyph_node->addAttribute("unicode", XMLString(font.unicode(c), false)); + glyph_node->addAttribute("horiz-adv-x", XMLString(font.hAdvance(c)*extend)); + glyph_node->addAttribute("vert-adv-y", XMLString(font.vAdvance(c))); + string name = font.glyphName(c); + if (!name.empty()) + glyph_node->addAttribute("glyph-name", name); + } + else { + ostringstream oss; + oss << 'g' << FontManager::instance().fontID(&font) << '-' << c; + glyph_node = new XMLElementNode("path"); + glyph_node->addAttribute("id", oss.str()); + sx = font.scaledSize()/upem; + sy = -sx; + } + ostringstream oss; + glyph.writeSVG(oss, sx, sy); + glyph_node->addAttribute("d", oss.str()); + return glyph_node; +} + + +void SVGTree::appendFontStyles (const set<const Font*> &fonts) { + if (CREATE_STYLE && USE_FONTS && !fonts.empty() && _defs) { + XMLElementNode *styleNode = new XMLElementNode("style"); + styleNode->addAttribute("type", "text/css"); + _root->insertAfter(styleNode, _defs); + typedef map<int, const Font*> SortMap; + SortMap sortmap; + FORALL(fonts, set<const Font*>::const_iterator, it) + if (!dynamic_cast<const VirtualFont*>(*it)) // skip virtual fonts + sortmap[FontManager::instance().fontID(*it)] = *it; + ostringstream style; + // add font style definitions in ascending order + FORALL(sortmap, SortMap::const_iterator, it) { + style << "text.f" << it->first << ' ' + << "{font-family:" << it->second->name() + << ";font-size:" << it->second->scaledSize() << "px"; + if (it->second->color() != Color::BLACK) + style << ";fill:" << it->second->color().rgbString(); + style << "}\n"; + } + XMLCDataNode *cdata = new XMLCDataNode(style.str()); + styleNode->append(cdata); + } +} + + +/** Appends glyph definitions of a given font to the defs section of the SVG tree. + * @param[in] font font to be appended + * @param[in] chars codes of the characters whose glyph outlines should be appended */ +void SVGTree::append (const PhysicalFont &font, const set<int> &chars, GFGlyphTracer::Callback *cb) { + if (chars.empty()) + return; + + if (USE_FONTS) { + XMLElementNode *fontNode = new XMLElementNode("font"); + string fontname = font.name(); + fontNode->addAttribute("id", fontname); + fontNode->addAttribute("horiz-adv-x", XMLString(font.hAdvance())); + appendToDefs(fontNode); + + XMLElementNode *faceNode = new XMLElementNode("font-face"); + faceNode->addAttribute("font-family", fontname); + faceNode->addAttribute("units-per-em", XMLString(font.unitsPerEm())); + if (font.type() != PhysicalFont::MF && !font.verticalLayout()) { + faceNode->addAttribute("ascent", XMLString(font.ascent())); + faceNode->addAttribute("descent", XMLString(font.descent())); + } + fontNode->append(faceNode); + + // add required missing-glyph element + XMLElementNode *missing = new XMLElementNode("missing-glyph"); + missing->addAttribute("d", ""); + fontNode->append(missing); + FORALL(chars, set<int>::const_iterator, i) + fontNode->append(createGlyphNode(*i, font, cb)); + } + else if (CREATE_USE_ELEMENTS && &font != font.uniqueFont()) { + // If the same character is used in various sizes, we don't want to embed the complete (lengthy) path + // descriptions multiple times. Because they would only differ by a scale factor, it's better to + // reference the already embedded path together with a transformation attribute and let the SVG renderer + // scale the glyphs properly. This is only necessary if we don't want to use font but path elements. + FORALL(chars, set<int>::const_iterator, it) { + ostringstream oss; + XMLElementNode *use = new XMLElementNode("use"); + oss << 'g' << FontManager::instance().fontID(&font) << '-' << *it; + use->addAttribute("id", oss.str()); + oss.str(""); + oss << "#g" << FontManager::instance().fontID(font.uniqueFont()) << '-' << *it; + use->addAttribute("xlink:href", oss.str()); + double scale = font.scaledSize()/font.uniqueFont()->scaledSize(); + if (scale != 1.0) { + oss.str(""); + oss << "scale(" << scale << ')'; + use->addAttribute("transform", oss.str()); + } + appendToDefs(use); + } + } + else { + FORALL(chars, set<int>::const_iterator, i) + appendToDefs(createGlyphNode(*i, font, cb)); + } +} + + +/** Pushes a new context element that will take all following nodes added to the page. */ +void SVGTree::pushContextElement (XMLElementNode *node) { + if (_pageContainerStack.empty()) + _page->append(node); + else + _pageContainerStack.top()->append(node); + _pageContainerStack.push(node); + _text = _span = 0; // ensure the creation of a new text element for the following characters added +} + + +/** Pops the current context element and restored the previous one. */ +void SVGTree::popContextElement () { + if (!_pageContainerStack.empty()) { + _pageContainerStack.pop(); + _text = _span = 0; // ensure the creation of a new text element for the following characters added + } +} |