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Diffstat (limited to 'dviware/dvisvgm/src/SVGCharPathHandler.cpp')
-rw-r--r-- | dviware/dvisvgm/src/SVGCharPathHandler.cpp | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/dviware/dvisvgm/src/SVGCharPathHandler.cpp b/dviware/dvisvgm/src/SVGCharPathHandler.cpp new file mode 100644 index 0000000000..3962168ae2 --- /dev/null +++ b/dviware/dvisvgm/src/SVGCharPathHandler.cpp @@ -0,0 +1,136 @@ +/************************************************************************* +** SVGCharPathHandler.cpp ** +** ** +** This file is part of dvisvgm -- a fast DVI to SVG converter ** +** Copyright (C) 2005-2019 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 <sstream> +#include "Font.hpp" +#include "FontManager.hpp" +#include "SVGCharPathHandler.hpp" +#include "utility.hpp" +#include "XMLNode.hpp" + +using namespace std; + +/** Constructs a new path builder. + * @param[in] createUseElements determines whether to create "use" elements to reference previous paths or not + * @param[in] relativePathCommands determines whether to create relative or absolute SVG path commands */ +SVGCharPathHandler::SVGCharPathHandler (bool createUseElements, bool relativePathCommands) + : _relativePathCommands(relativePathCommands) +{ + if (createUseElements) + _appendChar = &SVGCharPathHandler::appendUseElement; + else + _appendChar = &SVGCharPathHandler::appendPathElement; +} + + +void SVGCharPathHandler::resetContextNode () { + SVGCharHandler::resetContextNode(); + _groupNode = nullptr; +} + + +/** Appends the path representation of a single character to the context element. + * @param[in] c code of the character to be appended + * @param[in] x horizontal position of the character (in bp units) + * @param[in] y vertical position of the character (in bp units) */ +void SVGCharPathHandler::appendChar (uint32_t c, double x, double y) { + if (_font.changed()) { + _fontColor.set(_font.get()->color()); + if (_fontColor.changed() && _fontColor.get() != Color::BLACK) + _color.changed(true); // ensure application of text color when resetting the font color to black + _font.changed(false); + } + // Apply text color changes only if the color of the entire font is black. + // Glyphs of non-black fonts (e.g. defined in a XeTeX document) can't change their color. + CharProperty<Color> &color = (_fontColor.get() != Color::BLACK) ? _fontColor : _color; + bool applyColor = color.get() != Color::BLACK; + bool applyMatrix = !_matrix.get().isIdentity(); + if (!_groupNode) { + color.changed(applyColor); + _matrix.changed(applyMatrix); + } + if (color.changed() || _matrix.changed()) { + resetContextNode(); + if (applyColor || applyMatrix) { + _groupNode = pushContextNode(util::make_unique<XMLElement>("g")); + if (applyColor) + contextNode()->addAttribute("fill", color.get().svgColorString()); + if (applyMatrix) + contextNode()->addAttribute("transform", _matrix.get().toSVG()); + } + color.changed(false); + _matrix.changed(false); + } + const Font *font = _font.get(); + 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 (auto 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); + } + (this->*_appendChar)(c, x, y, rotation); +} + + +void SVGCharPathHandler::appendUseElement (uint32_t c, double x, double y, const Matrix &matrix) { + string id = "#g" + to_string(FontManager::instance().fontID(_font)) + "-" + to_string(c); + auto useNode = util::make_unique<XMLElement>("use"); + useNode->addAttribute("x", XMLString(x)); + useNode->addAttribute("y", XMLString(y)); + useNode->addAttribute("xlink:href", id); + if (!matrix.isIdentity()) + useNode->addAttribute("transform", matrix.toSVG()); + contextNode()->append(std::move(useNode)); +} + + +void SVGCharPathHandler::appendPathElement (uint32_t c, double x, double y, const Matrix &matrix) { + Glyph glyph; + auto pf = dynamic_cast<const PhysicalFont*>(_font.get()); + if (pf && pf->getGlyph(c, glyph)) { + double sx = pf->scaledSize()/pf->unitsPerEm(); + double sy = -sx; + ostringstream oss; + glyph.writeSVG(oss, _relativePathCommands, sx, sy, x, y); + auto glyphNode = util::make_unique<XMLElement>("path"); + glyphNode->addAttribute("d", oss.str()); + if (!matrix.isIdentity()) + glyphNode->addAttribute("transform", matrix.toSVG()); + contextNode()->append(std::move(glyphNode)); + } +} |