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b26b90ae0e
This is better because it implements a LRU cache. Indeed, while editing in particular, width of many different strings has to be computed. This is different from the previous situation where only width of single characters was computed and cached.
432 lines
9.9 KiB
C++
432 lines
9.9 KiB
C++
/**
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* \file FontLoader.cpp
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Asger Alstrup
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* \author John Levon
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*
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* Full author contact details are available in file CREDITS.
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*/
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#include <config.h>
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#include "FontLoader.h"
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#include "FontInfo.h"
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#include "GuiFontMetrics.h"
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#include "qt_helpers.h"
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#include "LyXRC.h"
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#include "support/convert.h"
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#include "support/debug.h"
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#include "support/filetools.h"
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#include "support/gettext.h"
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#include "support/lstrings.h"
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#include "support/Systemcall.h"
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#include "support/Package.h"
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#include "support/os.h"
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#include <QFontInfo>
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#include <QFontDatabase>
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#include "support/lassert.h"
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using namespace std;
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using namespace lyx::support;
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QString const math_fonts[] = {"cmex10", "cmmi10", "cmr10", "cmsy10",
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"esint10", "eufm10", "msam10", "msbm10", "rsfs10", "stmary10",
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"wasy10"};
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int const num_math_fonts = sizeof(math_fonts) / sizeof(*math_fonts);
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namespace lyx {
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extern docstring const stateText(FontInfo const & f);
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namespace frontend {
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/**
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* Matches Fonts against
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* actual QFont instances, and also caches metrics.
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*/
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class GuiFontInfo
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{
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public:
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GuiFontInfo(FontInfo const & f);
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/// The font instance
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QFont font;
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/// Metrics on the font
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GuiFontMetrics metrics;
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};
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namespace {
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struct SymbolFont {
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FontFamily lyx_family;
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QString family;
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QString xlfd;
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};
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SymbolFont symbol_fonts[] = {
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{ SYMBOL_FAMILY,"symbol", "-*-symbol-*-*-*-*-*-*-*-*-*-*-adobe-fontspecific"},
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{ CMR_FAMILY, "cmr10", "-*-cmr10-medium-*-*-*-*-*-*-*-*-*-*-*" },
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{ CMSY_FAMILY, "cmsy10", "-*-cmsy10-*-*-*-*-*-*-*-*-*-*-*-*" },
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{ CMM_FAMILY, "cmmi10", "-*-cmmi10-medium-*-*-*-*-*-*-*-*-*-*-*" },
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{ CMEX_FAMILY, "cmex10", "-*-cmex10-*-*-*-*-*-*-*-*-*-*-*-*" },
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{ MSA_FAMILY, "msam10", "-*-msam10-*-*-*-*-*-*-*-*-*-*-*-*" },
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{ MSB_FAMILY, "msbm10", "-*-msbm10-*-*-*-*-*-*-*-*-*-*-*-*" },
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{ EUFRAK_FAMILY,"eufm10", "-*-eufm10-medium-*-*-*-*-*-*-*-*-*-*-*" },
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{ RSFS_FAMILY, "rsfs10", "-*-rsfs10-medium-*-*-*-*-*-*-*-*-*-*-*" },
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{ STMARY_FAMILY,"stmary10","-*-stmary10-medium-*-*-*-*-*-*-*-*-*-*-*" },
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{ WASY_FAMILY, "wasy10", "-*-wasy10-medium-*-*-*-*-*-*-*-*-*-*-*" },
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{ ESINT_FAMILY, "esint10","-*-esint10-medium-*-*-*-*-*-*-*-*-*-*-*" }
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};
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size_t const nr_symbol_fonts = sizeof(symbol_fonts) / sizeof(symbol_fonts[0]);
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/// BUTT ugly !
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static GuiFontInfo * fontinfo_[NUM_FAMILIES][NUM_SERIES][NUM_SHAPE][NUM_SIZE];
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// Get font info (font + metrics) for the given LyX font.
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// if not cached, create it.
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GuiFontInfo & fontinfo(FontInfo const & f)
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{
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// LASSERT: Is there anything we might do here besides crash?
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LBUFERR(f.family() < NUM_FAMILIES);
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LBUFERR(f.series() < NUM_SERIES);
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LBUFERR(f.realShape() < NUM_SHAPE);
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LBUFERR(f.size() < NUM_SIZE);
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// fi is a reference to the pointer type (GuiFontInfo *) in the
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// fontinfo_ table.
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GuiFontInfo * & fi =
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fontinfo_[f.family()][f.series()][f.realShape()][f.size()];
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if (!fi)
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fi = new GuiFontInfo(f);
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return *fi;
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}
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QString rawName(QString const & family)
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{
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for (size_t i = 0; i < nr_symbol_fonts; ++i)
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if (family == symbol_fonts[i].family)
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return symbol_fonts[i].xlfd;
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LYXERR(Debug::FONT, "BUG: family not found !");
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return QString();
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}
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QString symbolFamily(FontFamily family)
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{
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for (size_t i = 0; i < nr_symbol_fonts; ++i) {
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if (family == symbol_fonts[i].lyx_family)
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return symbol_fonts[i].family;
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}
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return QString();
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}
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#if 0
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bool isSymbolFamily(FontFamily family)
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{
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return family >= SYMBOL_FAMILY && family <= ESINT_FAMILY;
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}
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#endif
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static bool isChosenFont(QFont & font, QString const & family,
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QString const & style)
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{
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// QFontInfo won't find a font that has only a few glyphs at unusual
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// positions, e.g. the original esint10 font.
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// The workaround is to add dummy glyphs at least at all ASCII
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// positions.
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QFontInfo fi(font);
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LYXERR(Debug::FONT, "got: " << fi.family());
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if (fi.family().contains(family)
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#if QT_VERSION >= 0x040800
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&& (style.isEmpty() || fi.styleName().contains(style))
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#endif
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) {
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LYXERR(Debug::FONT, " got it ");
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return true;
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}
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return false;
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}
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QFont symbolFont(QString const & family, bool * ok)
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{
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LYXERR(Debug::FONT, "Looking for font family " << family << " ... ");
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QString upper = family;
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upper[0] = family[0].toUpper();
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QFont font;
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font.setFamily(family);
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#if QT_VERSION >= 0x040800
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font.setStyleName("LyX");
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if (isChosenFont(font, family, "LyX")) {
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LYXERR(Debug::FONT, "lyx!");
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*ok = true;
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return font;
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}
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LYXERR(Debug::FONT, "Trying normal " << family << " ... ");
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font.setStyleName(QString());
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#endif
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if (isChosenFont(font, family, QString())) {
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LYXERR(Debug::FONT, "normal!");
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*ok = true;
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return font;
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}
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LYXERR(Debug::FONT, "Trying " << upper << " ... ");
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font.setFamily(upper);
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if (isChosenFont(font, upper, QString())) {
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LYXERR(Debug::FONT, "upper!");
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*ok = true;
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return font;
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}
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// A simple setFamily() fails on Qt 2
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QString const raw = rawName(family);
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LYXERR(Debug::FONT, "Trying " << raw << " ... ");
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font.setRawName(raw);
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if (isChosenFont(font, family, QString())) {
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LYXERR(Debug::FONT, "raw version!");
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*ok = true;
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return font;
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}
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LYXERR(Debug::FONT, " FAILED :-(");
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*ok = false;
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return font;
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}
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} // namespace anon
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FontLoader::FontLoader()
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{
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QString const fonts_dir =
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toqstr(addPath(package().system_support().absFileName(), "fonts"));
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for (int i = 0 ; i < num_math_fonts; ++i) {
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QString const font_file = fonts_dir + math_fonts[i] + ".ttf";
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int fontID = QFontDatabase::addApplicationFont(font_file);
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LYXERR(Debug::FONT, "Adding font " << font_file
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<< (fontID < 0 ? " FAIL" : " OK"));
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}
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for (int i1 = 0; i1 < NUM_FAMILIES; ++i1)
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for (int i2 = 0; i2 < NUM_SERIES; ++i2)
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for (int i3 = 0; i3 < NUM_SHAPE; ++i3)
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for (int i4 = 0; i4 < NUM_SIZE; ++i4)
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fontinfo_[i1][i2][i3][i4] = 0;
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}
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void FontLoader::update()
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{
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for (int i1 = 0; i1 < NUM_FAMILIES; ++i1)
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for (int i2 = 0; i2 < NUM_SERIES; ++i2)
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for (int i3 = 0; i3 < NUM_SHAPE; ++i3)
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for (int i4 = 0; i4 < NUM_SIZE; ++i4) {
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delete fontinfo_[i1][i2][i3][i4];
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fontinfo_[i1][i2][i3][i4] = 0;
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}
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}
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FontLoader::~FontLoader()
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{
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update();
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}
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/////////////////////////////////////////////////
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namespace {
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QString makeFontName(QString const & family, QString const & foundry)
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{
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QString res = family;
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if (!foundry.isEmpty())
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res += " [" + foundry + ']';
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return res;
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}
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QFont makeQFont(FontInfo const & f)
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{
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QFont font;
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QString const pat = symbolFamily(f.family());
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if (!pat.isEmpty()) {
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bool ok;
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font = symbolFont(pat, &ok);
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} else {
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switch (f.family()) {
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case ROMAN_FAMILY: {
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QString family = makeFontName(toqstr(lyxrc.roman_font_name),
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toqstr(lyxrc.roman_font_foundry));
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font.setFamily(family);
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#ifdef Q_OS_MAC
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#if QT_VERSION >= 0x040300 //&& QT_VERSION < 0x040800
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// Workaround for a Qt bug, see http://www.lyx.org/trac/ticket/3684
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// and http://bugreports.qt.nokia.com/browse/QTBUG-11145.
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// FIXME: Check whether this is really fixed in Qt 4.8
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if (family == "Times" && !font.exactMatch())
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font.setFamily("Times New Roman");
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#endif
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#endif
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break;
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}
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case SANS_FAMILY:
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font.setFamily(makeFontName(toqstr(lyxrc.sans_font_name),
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toqstr(lyxrc.sans_font_foundry)));
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break;
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case TYPEWRITER_FAMILY:
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font.setFamily(makeFontName(toqstr(lyxrc.typewriter_font_name),
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toqstr(lyxrc.typewriter_font_foundry)));
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break;
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default:
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break;
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}
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}
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switch (f.series()) {
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case MEDIUM_SERIES:
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font.setWeight(QFont::Normal);
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break;
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case BOLD_SERIES:
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font.setWeight(QFont::Bold);
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break;
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default:
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break;
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}
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switch (f.realShape()) {
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case ITALIC_SHAPE:
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font.setStyle(QFont::StyleItalic);
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break;
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case SLANTED_SHAPE:
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font.setStyle(QFont::StyleOblique);
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break;
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case SMALLCAPS_SHAPE:
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font.setCapitalization(QFont::SmallCaps);
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break;
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default:
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break;
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}
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LYXERR(Debug::FONT, "Font '" << stateText(f)
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<< "' matched by\n" << font.family());
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// Is this an exact match?
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if (font.exactMatch())
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LYXERR(Debug::FONT, "This font is an exact match");
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else
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LYXERR(Debug::FONT, "This font is NOT an exact match");
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LYXERR(Debug::FONT, "XFLD: " << font.rawName());
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font.setPointSizeF(convert<double>(lyxrc.font_sizes[f.size()])
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* lyxrc.zoom / 100.0);
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LYXERR(Debug::FONT, "The font has size: " << font.pointSizeF());
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return font;
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}
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} // anon namespace
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GuiFontInfo::GuiFontInfo(FontInfo const & f)
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: font(makeQFont(f)), metrics(font)
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{}
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bool FontLoader::available(FontInfo const & f)
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{
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// FIXME THREAD
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static vector<int> cache_set(NUM_FAMILIES, false);
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static vector<int> cache(NUM_FAMILIES, false);
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FontFamily family = f.family();
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#ifdef Q_OS_MAC
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// Apple ships a font name "Symbol", which has more or less the same
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// glyphs as the original PostScript Symbol font, but it uses a different
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// encoding (see https://en.wikipedia.org/wiki/Symbol_(typeface)#cite_note-2).
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// Since we expect the font specific encoding of the original
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// PostScript Symbol font, we can't use the one provided on OS X.
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// See also the discussion in bug 7954.
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if (f.family() == SYMBOL_FAMILY)
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return false;
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#endif
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if (cache_set[family])
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return cache[family];
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cache_set[family] = true;
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QString const pat = symbolFamily(family);
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if (pat.isEmpty())
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// We don't care about non-symbol fonts
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return false;
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bool ok;
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symbolFont(pat, &ok);
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if (!ok)
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return false;
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cache[family] = true;
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return true;
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}
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bool FontLoader::canBeDisplayed(char_type c)
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{
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// bug 8493
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if (c == 0x0009)
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// FIXME check whether this is still needed for Qt5
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return false;
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#if QT_VERSION < 0x050000 && defined(QT_MAC_USE_COCOA) && (QT_MAC_USE_COCOA > 0)
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// bug 7954, see also comment in GuiPainter::text()
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if (c == 0x00ad)
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return false;
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#endif
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return true;
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}
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FontMetrics const & FontLoader::metrics(FontInfo const & f)
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{
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return fontinfo(f).metrics;
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}
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GuiFontMetrics const & getFontMetrics(FontInfo const & f)
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{
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return fontinfo(f).metrics;
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}
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QFont const & getFont(FontInfo const & f)
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{
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return fontinfo(f).font;
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}
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} // namespace frontend
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} // namespace lyx
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