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-rw-r--r--src/object/sp-font.cpp273
1 files changed, 273 insertions, 0 deletions
diff --git a/src/object/sp-font.cpp b/src/object/sp-font.cpp
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+++ b/src/object/sp-font.cpp
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+// 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 :
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