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Add support for reading designspace files/design units
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,211 @@ | ||
| /* Copyright 2024 Adobe Systems Incorporated (http://www.adobe.com/). All Rights Reserved. | ||
| This software is licensed as OpenSource, under the Apache License, Version 2.0. | ||
| This license is available at: http://opensource.org/licenses/Apache-2.0. */ | ||
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| #include "designspace.h" | ||
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| #include <libxml/tree.h> | ||
| #include <libxml/parser.h> | ||
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| #include <algorithm> | ||
| #include <cstdlib> | ||
| #include <iostream> | ||
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| #include "supportfp.h" | ||
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| bool Designspace::checkAxes(var_axes &va) { | ||
| if (!readFile) | ||
| return true; | ||
| if (va.getAxisCount() != axes.size()) { | ||
| logger->log(sFATAL, "designspace file has different number of axes than " | ||
| "fvar table in font"); | ||
| return false; | ||
| } | ||
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| for (auto &a : axes) { | ||
| a.var_axes_index = va.getAxisIndex(a.tag); | ||
| if (a.var_axes_index == -1) { | ||
| logger->log(sFATAL, "axis '%s' from designspace file not found in fvar", | ||
| a.name.c_str()); | ||
| return false; | ||
| } | ||
| } | ||
| std::sort(axes.begin(), axes.end(), [](const axis &a, const axis &b) { return a.var_axes_index < b.var_axes_index; }); | ||
| for (size_t i = 0; i < axes.size(); i++) { | ||
| auto &vaa = va.axes[i]; | ||
| auto &a = axes[i]; | ||
| assert(a.var_axes_index == i); | ||
| if (vaa.defaultValue != a.defaultValue || vaa.minValue != a.minValue || | ||
| vaa.maxValue != a.maxValue) { | ||
| logger->log(sFATAL, "axis '%s' has different values in designspace versus fvar", | ||
| a.name.c_str()); | ||
| return false; | ||
| } | ||
| } | ||
| return true; | ||
| } | ||
|
|
||
| Fixed Designspace::userizeCoord(uint16_t axisIndex, Fixed v) { | ||
| if (!readFile) { | ||
| logger->log(sERROR, "Design unit value used without designspace file"); | ||
| return v; | ||
| } | ||
| assert(axisIndex < axes.size()); | ||
| auto &a = axes[axisIndex]; | ||
| if (a.valueMap.size() == 0) | ||
| return v; | ||
| auto i = a.valueMap.lower_bound(v); | ||
| if (i == a.valueMap.end()) { | ||
| logger->log(sWARNING, "Design value %g greater than highest map value for axis '%s', " | ||
| "pinning to maximum axis value", | ||
| (float) v / 65536.0, a.name.c_str()); | ||
| return a.maxValue; | ||
| } | ||
| if (i->first == v) | ||
| return i->second; | ||
| assert(i->first > v); | ||
| if (i == a.valueMap.begin()) { | ||
| logger->log(sWARNING, "Design value %g less than lowest map value for axis '%s', " | ||
| "pinning to minimum axis value", | ||
| (float) v / 65536.0, a.name.c_str()); | ||
| return a.minValue; | ||
| } | ||
| Fixed highD = i->first, highU = i->second; | ||
| i--; | ||
| Fixed lowD = i->first, lowU = i->second; | ||
| assert(lowD < v); | ||
| float adj = (float)(highU - lowU) * (float) (v - lowD) / (float) (highD - lowD); | ||
| return lowU + roundf(adj); | ||
| } | ||
|
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||
| bool Designspace::read(const char *filename) { | ||
| auto doc = xmlReadFile(filename, NULL, 0); | ||
| if (doc == nullptr) { | ||
| logger->log(sERROR, "Error reading designspace file '%s'", filename); | ||
| return false; | ||
| } | ||
| auto root = xmlDocGetRootElement(doc); | ||
| if (root == nullptr) { | ||
| logger->log(sERROR, "Empty designspace file '%s'", filename); | ||
| xmlFreeDoc(doc); | ||
| return false; | ||
| } | ||
| readFile = true; | ||
| auto cur = root->xmlChildrenNode; | ||
| while (cur != nullptr) { | ||
| if (xmlStrcmp(cur->name, (const xmlChar *) "axes") == 0) | ||
| if (!readAxes(doc, cur)) | ||
| return false; | ||
| cur = cur->next; | ||
| } | ||
| xmlFreeDoc(doc); | ||
| return true; | ||
| } | ||
|
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| bool Designspace::readAxes(xmlDocPtr doc, xmlNodePtr axesptr) { | ||
| assert(axesptr != nullptr); | ||
| auto cur = axesptr->xmlChildrenNode; | ||
| while (cur != nullptr) { | ||
| axis a; | ||
| if (xmlStrcmp(cur->name, (const xmlChar *) "axis")) { | ||
| cur = cur->next; | ||
| continue; | ||
| } | ||
| auto attr = cur->properties; | ||
| while (attr != nullptr) { | ||
| if (xmlStrcmp(attr->name, (const xmlChar *) "name") == 0) { | ||
| a.name = (char*) attr->children->content; | ||
| } else if (xmlStrcmp(attr->name, (const xmlChar *) "tag") == 0) { | ||
| a.tag = str2tag((char *) attr->children->content); | ||
| if (a.tag == 0) | ||
| return false; | ||
| } else if (xmlStrcmp(attr->name, (const xmlChar *) "hidden") == 0) { | ||
| a.hidden = attr->children->content[0] == '1'; | ||
| } else if (xmlStrcmp(attr->name, (const xmlChar *) "values") == 0) { | ||
| a.discrete = true; | ||
| } else if (xmlStrcmp(attr->name, (const xmlChar *) "default") == 0) { | ||
| if (!getFixed(attr, a.defaultValue)) | ||
| return false; | ||
| } else if (xmlStrcmp(attr->name, (const xmlChar *) "minimum") == 0) { | ||
| if (!getFixed(attr, a.minValue)) | ||
| return false; | ||
| } else if (xmlStrcmp(attr->name, (const xmlChar *) "maximum") == 0) { | ||
| if (!getFixed(attr, a.maxValue)) | ||
| return false; | ||
| } | ||
| attr = attr->next; | ||
| } | ||
| auto child = cur->xmlChildrenNode; | ||
| while (child != nullptr) { | ||
| if (xmlStrcmp(child->name, (const xmlChar *) "map") == 0) { | ||
| Fixed userV, designV; | ||
| attr = child->properties; | ||
| while (attr != nullptr) { | ||
| if (xmlStrcmp(attr->name, (const xmlChar *) "input") == 0) { | ||
| if (!getFixed(attr, userV)) | ||
| return false; | ||
| } else if (xmlStrcmp(attr->name, (const xmlChar *) "output") == 0) { | ||
| if (!getFixed(attr, designV)) | ||
| return false; | ||
| } | ||
| attr = attr->next; | ||
| } | ||
| a.valueMap.insert({designV, userV}); | ||
| } | ||
| child = child->next; | ||
| } | ||
| axes.push_back(std::move(a)); | ||
| cur = cur->next; | ||
| } | ||
| toerr(); | ||
| return true; | ||
| } | ||
|
|
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| void Designspace::toerr() { | ||
| for (auto &a : axes) { | ||
| std::cout << "Designspace Axis " << a.name << "(tag " << a.tag << "):" << std::endl; | ||
| std::cout << " min: " << a.minValue / 65536.0 << ", default: " << a.defaultValue / 65536.0 << ", max: " << a.maxValue / 65536.0 << std::endl; | ||
| std::cout << " map:"; | ||
| for (auto [designV, userV] : a.valueMap) { | ||
| std::cout << userV / 65536.0 << " -> " << designV / 65536.0 << ", "; | ||
| } | ||
| std::cout << std::endl; | ||
| } | ||
| } | ||
|
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| bool Designspace::getFixed(xmlAttr *attr, Fixed &r) { | ||
| char *end; | ||
| float f = strtof((char *) attr->children->content, &end); | ||
| if (end == (char *) attr->children->content) { | ||
| logger->log(sERROR, "Invalid numeric attribute in axis '%s'", attr->children->content); | ||
| return false; | ||
| } | ||
| r = pflttofix(&f); | ||
| return true; | ||
| } | ||
|
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| // XXX Pretty much copied from FeatCtx.cpp | ||
| ctlTag Designspace::str2tag(const std::string &tagName) { | ||
| if (tagName.length() == 0) { | ||
| logger->log(sERROR, "Empty tag in designspace axis element"); | ||
| return 0; | ||
| } | ||
|
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| if ( tagName.length() > 4 ) | ||
| logger->log(sERROR, "Tag %s exceeds 4 characters", tagName.c_str()); | ||
|
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| char buf[4]; | ||
| size_t l = tagName.length(); | ||
| for (size_t i = 0; i < 4; i++) { | ||
| char c {' '}; | ||
| if (i < l) { | ||
| c = tagName[i]; | ||
| if (c < 0x20 || c > 0x7E) { | ||
| logger->log(sERROR, "Invalid character value %hhx in tag string", c); | ||
| c = 0; | ||
| } | ||
| } | ||
| buf[i] = c; | ||
| } | ||
| return CTL_TAG(buf[0], buf[1], buf[2], buf[3]); | ||
| } |
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