summaryrefslogtreecommitdiff
path: root/Build/source/texk/dvisvgm/dvisvgm-1.0.12/src/FontCache.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-1.0.12/src/FontCache.cpp')
-rw-r--r--Build/source/texk/dvisvgm/dvisvgm-1.0.12/src/FontCache.cpp387
1 files changed, 387 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.0.12/src/FontCache.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.0.12/src/FontCache.cpp
new file mode 100644
index 00000000000..8c68f2ee465
--- /dev/null
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.0.12/src/FontCache.cpp
@@ -0,0 +1,387 @@
+/*************************************************************************
+** FontCache.cpp **
+** **
+** This file is part of dvisvgm -- the DVI to SVG converter **
+** Copyright (C) 2005-2012 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 <algorithm>
+#include <cstring>
+#include <fstream>
+#include <iomanip>
+#include <sstream>
+#include "CRC32.h"
+#include "FileSystem.h"
+#include "FontCache.h"
+#include "Glyph.h"
+#include "Pair.h"
+#include "StreamReader.h"
+#include "StreamWriter.h"
+//#include "gzstream.h"
+#include "types.h"
+
+using namespace std;
+
+const UInt8 FontCache::VERSION = 5;
+
+
+static Pair32 read_pair (int bytes, StreamReader &sr) {
+ Int32 x = sr.readSigned(bytes);
+ Int32 y = sr.readSigned(bytes);
+ return Pair32(x, y);
+}
+
+
+FontCache::FontCache () : _changed(false)
+{
+}
+
+
+FontCache::~FontCache () {
+ clear();
+}
+
+
+/** Removes all data from the cache. This does not affect the cache files. */
+void FontCache::clear () {
+ _glyphs.clear();
+ _fontname.clear();
+}
+
+
+/** Assigns glyph data to a character and adds it to the cache.
+ * @param[in] c character code
+ * @param[in] glyph font glyph data */
+void FontCache::setGlyph (int c, const Glyph &glyph) {
+ _glyphs[c] = glyph;
+ _changed = true;
+}
+
+
+/** Returns the corresponding glyph data of a given character of the current font.
+ * @param[in] c character code
+ * @return font glyph data (0 if no matching data was found) */
+const Glyph* FontCache::getGlyph (int c) const {
+ GlyphMap::const_iterator it = _glyphs.find(c);
+ return (it != _glyphs.end()) ? &it->second : 0;
+}
+
+
+/** Writes the current cache data to a file (only if anything changed after
+ * the last call of read()).
+ * @param[in] fontname name of current font
+ * @param[in] dir directory where the cache file should go
+ * @return true if writing was successful */
+bool FontCache::write (const char *fontname, const char *dir) const {
+ if (!_changed)
+ return true;
+
+ if (fontname && strlen(fontname) > 0) {
+ if (dir == 0 || strlen(dir) == 0)
+ dir = FileSystem::getcwd().c_str();
+ ostringstream oss;
+ oss << dir << '/' << fontname << ".fgd";
+// ogzstream ofs(oss.str().c_str(), 9, ios::binary|ios::out);
+ ofstream ofs(oss.str().c_str(), ios::binary);
+ return write(fontname, ofs);
+ }
+ return false;
+}
+
+
+bool FontCache::write (const char* dir) const {
+ return _fontname.empty() ? false : write(_fontname.c_str(), dir);
+}
+
+
+/** Returns the minimal number of bytes needed to store the given value. */
+static int max_int_size (Int32 value) {
+ Int32 limit = 0x7f;
+ for (int i=1; i <= 4; i++) {
+ if ((value < 0 && -value <= limit+1) || (value >= 0 && value <= limit))
+ return i;
+ limit = (limit << 8) | 0xff;
+ }
+ return 4;
+}
+
+
+/** Returns the minimal number of bytes needed to store the biggest
+ * pair component of the given vector. */
+static int max_int_size (const Pair<Int32> *pairs, size_t n) {
+ int ret=0;
+ for (size_t i=0; i < n; i++) {
+ ret = max(ret, max_int_size(pairs[i].x()));
+ ret = max(ret, max_int_size(pairs[i].y()));
+ }
+ return ret;
+}
+
+
+/** Writes the current cache data to a stream (only if anything changed after
+ * the last call of read()).
+ * @param[in] fontname name of current font
+ * @param[in] os output stream
+ * @return true if writing was successful */
+bool FontCache::write (const char *fontname, ostream &os) const {
+ if (!_changed)
+ return true;
+ if (!os)
+ return false;
+
+ StreamWriter sw(os);
+ CRC32 crc32;
+
+ struct WriteActions : Glyph::Actions {
+ WriteActions (StreamWriter &sw, CRC32 &crc32) : _sw(sw), _crc32(crc32) {}
+
+ void draw (char cmd, const Glyph::Point *points, int n) {
+ int bytes = max_int_size(points, n);
+ int cmdchar = (bytes << 5) | (cmd - 'A');
+ _sw.writeUnsigned(cmdchar, 1, _crc32);
+ for (int i=0; i < n; i++) {
+ _sw.writeSigned(points[i].x(), bytes, _crc32);
+ _sw.writeSigned(points[i].y(), bytes, _crc32);
+ }
+ }
+ StreamWriter &_sw;
+ CRC32 &_crc32;
+ } actions(sw, crc32);
+
+ sw.writeUnsigned(VERSION, 1, crc32);
+ sw.writeUnsigned(0, 4); // space for checksum
+ sw.writeString(fontname, crc32, true);
+ sw.writeUnsigned(_glyphs.size(), 4, crc32);
+ FORALL(_glyphs, GlyphMap::const_iterator, it) {
+ const Glyph &glyph = it->second;
+ sw.writeUnsigned(it->first, 4, crc32);
+ sw.writeUnsigned(glyph.size(), 2, crc32);
+ glyph.iterate(actions, false);
+ }
+ os.seekp(1);
+ sw.writeUnsigned(crc32.get(), 4); // insert CRC32 checksum
+ os.seekp(0, ios::end);
+ return true;
+}
+
+
+/** Reads font glyph information from a file.
+ * @param[in] fontname name of font data to read
+ * @param[in] dir directory where the cache files are located
+ * @return true if reading was successful */
+bool FontCache::read (const char *fontname, const char *dir) {
+ if (_fontname == fontname)
+ return true;
+ clear();
+ if (fontname && strlen(fontname) > 0) {
+ if (dir == 0 || strlen(dir) == 0)
+ dir = FileSystem::getcwd().c_str();
+ ostringstream oss;
+ oss << dir << '/' << fontname << ".fgd";
+ ifstream ifs(oss.str().c_str(), ios::binary);
+// igzstream ifs(oss.str().c_str(), 9, ios::binary|ios::in);
+ return read(fontname, ifs);
+ }
+ return false;
+}
+
+
+/** Reads font glyph information from a stream.
+ * @param[in] fontname name of font data to read
+ * @param[in] dir input stream
+ * @return true if reading was successful */
+bool FontCache::read (const char *fontname, istream &is) {
+ if (_fontname == fontname)
+ return true;
+ clear();
+ _fontname = fontname;
+ if (!is)
+ return false;
+
+ StreamReader sr(is);
+ CRC32 crc32;
+ if (sr.readUnsigned(1, crc32) != VERSION)
+ return false;
+
+ UInt32 crc32_cmp = sr.readUnsigned(4);
+ crc32.update(is);
+ if (crc32.get() != crc32_cmp)
+ return false;
+
+ is.clear();
+ is.seekg(5); // continue reading after checksum
+
+ string fname = sr.readString();
+ if (fname != fontname)
+ return false;
+
+ UInt32 num_glyphs = sr.readUnsigned(4);
+ while (num_glyphs-- > 0) {
+ UInt32 c = sr.readUnsigned(4); // character code
+ UInt16 s = sr.readUnsigned(2); // number of path commands
+ Glyph &glyph = _glyphs[c];
+ while (s-- > 0) {
+ UInt8 cmdval = sr.readUnsigned(1);
+ UInt8 cmdchar = (cmdval & 0x1f) + 'A';
+ int bytes = cmdval >> 5;
+ switch (cmdchar) {
+ case 'C': {
+ Pair32 p1 = read_pair(bytes, sr);
+ Pair32 p2 = read_pair(bytes, sr);
+ Pair32 p3 = read_pair(bytes, sr);
+ glyph.cubicto(p1, p2, p3);
+ break;
+ }
+ case 'L':
+ glyph.lineto(read_pair(bytes, sr));
+ break;
+ case 'M':
+ glyph.moveto(read_pair(bytes, sr));
+ break;
+ case 'Q': {
+ Pair32 p1 = read_pair(bytes, sr);
+ Pair32 p2 = read_pair(bytes, sr);
+ glyph.conicto(p1, p2);
+ break;
+ }
+ case 'Z':
+ glyph.closepath();
+ }
+ }
+ }
+ _changed = false;
+ return true;
+}
+
+
+/** Collects font cache information.
+ * @param[in] dirname path to font cache directory
+ * @param[out] infos the collected font information
+ * @param[out] invalid names of outdated/corrupted cache files
+ * @return true on success */
+bool FontCache::fontinfo (const char *dirname, vector<FontInfo> &infos, vector<string> &invalid) {
+ infos.clear();
+ invalid.clear();
+ if (dirname) {
+ vector<string> fnames;
+ FileSystem::collect(dirname, fnames);
+ FORALL(fnames, vector<string>::iterator, it) {
+ if ((*it)[0] == 'f' && it->length() > 5 && it->substr(it->length()-4) == ".fgd") {
+ FontInfo info;
+ string path = string(dirname)+"/"+(it->substr(1));
+ ifstream ifs(path.c_str(), ios::binary);
+ if (fontinfo(ifs, info))
+ infos.push_back(info);
+ else
+ invalid.push_back(it->substr(1));
+ }
+ }
+ }
+ return infos.size() > 0;
+}
+
+
+/** Collects font cache information of a single font.
+ * @param[in] is input stream of the cache file
+ * @param[out] info the collected data
+ * @return true if data could be read, false if cache file is unavailable, outdated, or corrupted */
+bool FontCache::fontinfo (std::istream &is, FontInfo &info) {
+ info.name.clear();
+ info.numchars = info.numbytes = info.numcmds = 0;
+ if (is) {
+ is.clear();
+ is.seekg(0);
+ StreamReader sr(is);
+ CRC32 crc32;
+ if ((info.version = sr.readUnsigned(1, crc32)) != VERSION)
+ return false;
+
+ info.checksum = sr.readUnsigned(4);
+ crc32.update(is);
+ if (crc32.get() != info.checksum)
+ return false;
+
+ is.clear();
+ is.seekg(5); // continue reading after checksum
+
+ info.name = sr.readString();
+ info.numchars = sr.readUnsigned(4);
+ for (UInt32 i=0; i < info.numchars; i++) {
+ sr.readUnsigned(4); // character code
+ UInt16 s = sr.readUnsigned(2); // number of path commands
+ while (s-- > 0) {
+ UInt8 cmdval = sr.readUnsigned(1);
+ UInt8 cmdchar = (cmdval & 0x1f) + 'A';
+ int bytes = cmdval >> 5;
+ int bc = 0;
+ switch (cmdchar) {
+ case 'C': bc = 6*bytes; break;
+ case 'H':
+ case 'L':
+ case 'M':
+ case 'T':
+ case 'V': bc = 2*bytes; break;
+ case 'Q':
+ case 'S': bc = 4*bytes; break;
+ case 'Z': break;
+ default : return false;
+ }
+ info.numbytes += bc+1; // command length + command
+ info.numcmds++;
+ is.seekg(bc, ios_base::cur);
+ }
+ info.numbytes += 6; // number of path commands + char code
+ }
+ info.numbytes += 6+info.name.length(); // version + 0-byte + fontname + number of chars
+ }
+ return true;
+}
+
+
+/** Collects font cache information and write it to a stream.
+ * @param[in] dirname path to font cache directory
+ * @param[in] os output is written to this stream
+ * @param[in] purge if true, outdated and corrupted cache files are removed */
+void FontCache::fontinfo (const char *dirname, ostream &os, bool purge) {
+ if (dirname) {
+ vector<FontInfo> infos;
+ vector<string> invalid_files;
+ if (fontinfo(dirname, infos, invalid_files)) {
+ os << "cache format version " << infos[0].version << endl;
+ typedef map<string,FontInfo*> SortMap;
+ SortMap sortmap;
+ FORALL(infos, vector<FontInfo>::iterator, it)
+ sortmap[it->name] = &(*it);
+
+ FORALL(sortmap, SortMap::iterator, it) {
+ os << dec << setfill(' ') << left
+ << setw(10) << left << it->second->name
+ << setw(5) << right << it->second->numchars << " char" << (it->second->numchars == 1 ? ' ':'s')
+ << setw(10) << right << it->second->numcmds << " cmd" << (it->second->numcmds == 1 ? ' ':'s')
+ << setw(12) << right << it->second->numbytes << " byte" << (it->second->numbytes == 1 ? ' ':'s')
+ << setw(6) << "crc:" << setw(8) << hex << right << setfill('0') << it->second->checksum
+ << endl;
+ }
+ }
+ else
+ os << "cache is empty\n";
+ FORALL(invalid_files, vector<string>::iterator, it) {
+ string path=string(dirname)+"/"+(*it);
+ if (FileSystem::remove(path))
+ os << "invalid cache file " << (*it) << " removed\n";
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-28 20:35:58 +0000