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Diffstat (limited to '')
-rw-r--r-- | src/object/sp-font.cpp | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/src/object/sp-font.cpp b/src/object/sp-font.cpp new file mode 100644 index 0000000..a636cae --- /dev/null +++ b/src/object/sp-font.cpp @@ -0,0 +1,273 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * SVG <font> element implementation + * + * Author: + * Felipe C. da S. Sanches <juca@members.fsf.org> + * Abhishek Sharma + * + * Copyright (C) 2008, Felipe C. da S. Sanches + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include "xml/repr.h" +#include "attributes.h" +#include "sp-font.h" +#include "sp-glyph.h" +#include "document.h" + +#include "display/nr-svgfonts.h" + + +//I think we should have extra stuff here and in the set method in order to set default value as specified at http://www.w3.org/TR/SVG/fonts.html + +// TODO determine better values and/or make these dynamic: +double FNT_DEFAULT_ADV = 1024; // TODO determine proper default +double FNT_DEFAULT_ASCENT = 768; // TODO determine proper default +double FNT_UNITS_PER_EM = 1024; // TODO determine proper default + +SPFont::SPFont() : SPObject() { + this->horiz_origin_x = 0; + this->horiz_origin_y = 0; + this->horiz_adv_x = FNT_DEFAULT_ADV; + this->vert_origin_x = FNT_DEFAULT_ADV / 2.0; + this->vert_origin_y = FNT_DEFAULT_ASCENT; + this->vert_adv_y = FNT_UNITS_PER_EM; +} + +SPFont::~SPFont() = default; + +void SPFont::build(SPDocument *document, Inkscape::XML::Node *repr) { + SPObject::build(document, repr); + + this->readAttr(SPAttr::HORIZ_ORIGIN_X); + this->readAttr(SPAttr::HORIZ_ORIGIN_Y); + this->readAttr(SPAttr::HORIZ_ADV_X); + this->readAttr(SPAttr::VERT_ORIGIN_X); + this->readAttr(SPAttr::VERT_ORIGIN_Y); + this->readAttr(SPAttr::VERT_ADV_Y); + + document->addResource("font", this); +} + +/** + * Callback for child_added event. + */ +void SPFont::child_added(Inkscape::XML::Node *child, Inkscape::XML::Node *ref) { + SPObject::child_added(child, ref); + + if (!_block) this->parent->requestModified(SP_OBJECT_MODIFIED_FLAG); +} + + +/** + * Callback for remove_child event. + */ +void SPFont::remove_child(Inkscape::XML::Node* child) { + SPObject::remove_child(child); + + if (!_block) this->parent->requestModified(SP_OBJECT_MODIFIED_FLAG); +} + +void SPFont::release() { + this->document->removeResource("font", this); + + SPObject::release(); +} + +void SPFont::set(SPAttr key, const gchar *value) { + // TODO these are floating point, so some epsilon comparison would be good + switch (key) { + case SPAttr::HORIZ_ORIGIN_X: + { + double number = value ? g_ascii_strtod(value, nullptr) : 0; + + if (number != this->horiz_origin_x){ + this->horiz_origin_x = number; + this->requestModified(SP_OBJECT_MODIFIED_FLAG); + } + break; + } + case SPAttr::HORIZ_ORIGIN_Y: + { + double number = value ? g_ascii_strtod(value, nullptr) : 0; + + if (number != this->horiz_origin_y){ + this->horiz_origin_y = number; + this->requestModified(SP_OBJECT_MODIFIED_FLAG); + } + break; + } + case SPAttr::HORIZ_ADV_X: + { + double number = value ? g_ascii_strtod(value, nullptr) : FNT_DEFAULT_ADV; + + if (number != this->horiz_adv_x){ + this->horiz_adv_x = number; + this->requestModified(SP_OBJECT_MODIFIED_FLAG); + } + break; + } + case SPAttr::VERT_ORIGIN_X: + { + double number = value ? g_ascii_strtod(value, nullptr) : FNT_DEFAULT_ADV / 2.0; + + if (number != this->vert_origin_x){ + this->vert_origin_x = number; + this->requestModified(SP_OBJECT_MODIFIED_FLAG); + } + break; + } + case SPAttr::VERT_ORIGIN_Y: + { + double number = value ? g_ascii_strtod(value, nullptr) : FNT_DEFAULT_ASCENT; + + if (number != this->vert_origin_y){ + this->vert_origin_y = number; + this->requestModified(SP_OBJECT_MODIFIED_FLAG); + } + break; + } + case SPAttr::VERT_ADV_Y: + { + double number = value ? g_ascii_strtod(value, nullptr) : FNT_UNITS_PER_EM; + + if (number != this->vert_adv_y){ + this->vert_adv_y = number; + this->requestModified(SP_OBJECT_MODIFIED_FLAG); + } + break; + } + default: + SPObject::set(key, value); + break; + } +} + +/** + * Receives update notifications. + */ +void SPFont::update(SPCtx *ctx, guint flags) { + if (flags & (SP_OBJECT_MODIFIED_FLAG)) { + this->readAttr(SPAttr::HORIZ_ORIGIN_X); + this->readAttr(SPAttr::HORIZ_ORIGIN_Y); + this->readAttr(SPAttr::HORIZ_ADV_X); + this->readAttr(SPAttr::VERT_ORIGIN_X); + this->readAttr(SPAttr::VERT_ORIGIN_Y); + this->readAttr(SPAttr::VERT_ADV_Y); + } + + SPObject::update(ctx, flags); +} + +#define COPY_ATTR(rd,rs,key) (rd)->setAttribute((key), rs->attribute(key)); + +Inkscape::XML::Node* SPFont::write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags) { + if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) { + repr = xml_doc->createElement("svg:font"); + } + + repr->setAttributeSvgDouble("horiz-origin-x", this->horiz_origin_x); + repr->setAttributeSvgDouble("horiz-origin-y", this->horiz_origin_y); + repr->setAttributeSvgDouble("horiz-adv-x", this->horiz_adv_x); + repr->setAttributeSvgDouble("vert-origin-x", this->vert_origin_x); + repr->setAttributeSvgDouble("vert-origin-y", this->vert_origin_y); + repr->setAttributeSvgDouble("vert-adv-y", this->vert_adv_y); + + if (repr != this->getRepr()) { + // All the below COPY_ATTR functions are directly using + // the XML Tree while they shouldn't + COPY_ATTR(repr, this->getRepr(), "horiz-origin-x"); + COPY_ATTR(repr, this->getRepr(), "horiz-origin-y"); + COPY_ATTR(repr, this->getRepr(), "horiz-adv-x"); + COPY_ATTR(repr, this->getRepr(), "vert-origin-x"); + COPY_ATTR(repr, this->getRepr(), "vert-origin-y"); + COPY_ATTR(repr, this->getRepr(), "vert-adv-y"); + } + + SPObject::write(xml_doc, repr, flags); + + return repr; +} + +using Inkscape::XML::Node; + +SPGlyph* SPFont::create_new_glyph(const char* name, const char* unicode) { + + Inkscape::XML::Document* xml_doc = document->getReprDoc(); + + // create a new glyph + Inkscape::XML::Node* grepr = xml_doc->createElement("svg:glyph"); + + grepr->setAttribute("glyph-name", name); + grepr->setAttribute("unicode", unicode); + + // Append the new glyph node to the current font + getRepr()->appendChild(grepr); + Inkscape::GC::release(grepr); + + // get corresponding object + SPGlyph* g = SP_GLYPH(document->getObjectByRepr(grepr)); + + g_assert(g != nullptr); + g_assert(SP_IS_GLYPH(g)); + + g->setCollectionPolicy(SPObject::COLLECT_WITH_PARENT); + + return g; +} + +void SPFont::sort_glyphs() { + auto* repr = getRepr(); + g_assert(repr); + + std::vector<std::pair<SPGlyph*, Node*>> glyphs; + glyphs.reserve(repr->childCount()); + + // collect all glyphs (SPGlyph and their representations) + for (auto&& node : children) { + if (auto g = dynamic_cast<SPGlyph*>(&node)) { + glyphs.emplace_back(g, g->getRepr()); + // keep representation around as it gets removed + g->getRepr()->anchor(); + } + } + + // now sort by unicode point + std::stable_sort(begin(glyphs), end(glyphs), [](const std::pair<SPGlyph*, Node*>& a, const std::pair<SPGlyph*, Node*>& b) { + // compare individual unicode points in each string one by one to establish glyph order + // note: ustring operator< doesn't work as expected + const auto& str1 = a.first->unicode; + const auto& str2 = b.first->unicode; + return std::lexicographical_compare(str1.begin(), str1.end(), str2.begin(), str2.end()); + }); + + // remove all glyph nodes from the document; block notifications + _block = true; + + for (auto&& glyph : glyphs) { + repr->removeChild(glyph.second); + } + + // re-add them in the desired order + for (auto&& glyph : glyphs) { + repr->appendChild(glyph.second); + glyph.second->release(); + } + + _block = false; + // notify listeners about the change + parent->requestModified(SP_OBJECT_MODIFIED_FLAG); +} + +/* + Local Variables: + mode:c++ + c-file-style:"stroustrup" + c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +)) + indent-tabs-mode:nil + fill-column:99 + End: +*/ +// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 : |