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/*************************************************************************
** SVGCharPathHandler.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2022 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 "SVGElement.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->isIdentity();
bool applyOpacity = !_opacity->isFillDefault();
if (!_groupNode) {
color.changed(applyColor);
_matrix.changed(applyMatrix);
}
if (color.changed() || _matrix.changed() || _opacity.changed()) {
resetContextNode();
if (applyColor || applyMatrix || applyOpacity) {
_groupNode = pushContextNode(util::make_unique<SVGElement>("g"));
contextNode()->setFillColor(color);
contextNode()->setFillOpacity(_opacity->fillalpha());
contextNode()->setTransform(_matrix);
}
color.changed(false);
_matrix.changed(false);
_opacity.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 = font_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, nullptr);
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<SVGElement>("use");
useNode->addAttribute("x", x);
useNode->addAttribute("y", y);
useNode->addAttribute("xlink:href", id);
useNode->setFillOpacity(_opacity->blendMode()); // add blend mode style here because it's not inheritable
useNode->setTransform(matrix);
contextNode()->append(std::move(useNode));
}
void SVGCharPathHandler::appendPathElement (uint32_t c, double x, double y, const Matrix &matrix) {
Glyph glyph;
auto pf = font_cast<const PhysicalFont*>(_font.get());
if (pf && pf->getGlyph(c, glyph, nullptr)) {
double sx = pf->scaledSize()/pf->unitsPerEm();
double sy = -sx;
ostringstream oss;
glyph.writeSVG(oss, _relativePathCommands, sx, sy, x, y);
auto glyphNode = util::make_unique<SVGElement>("path");
glyphNode->addAttribute("d", oss.str());
glyphNode->setTransform(matrix);
contextNode()->append(std::move(glyphNode));
}
}
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