Initial pluggable fontdatabase

QPlatformFontDatabase added. QPlatformIntegration now has a new virtual
function: QPlatformDatabase::fontDatabase() const. Most unix platform
plugins wants to follow the pattern implemented in directfb, linuxfb,
vnc etc. In the pro file do:
include(../fontdatabases/genericunix/genericunix.pri)

In the QPlatformIntegration class do:

and instansiate a QGenericFontDatabase in the constructor and return
it in the getter function.

3 files changed, 555 insertions, 0 deletions

diff --git a/src/plugins/platforms/fontdatabases/fontconfig/fontconfig.pri b/src/plugins/platforms/fontdatabases/fontconfig/fontconfig.pri
new file mode 100644
index 0000000..19c74ed
--- /dev/null
+++ b/src/plugins/platforms/fontdatabases/fontconfig/fontconfig.pri
@@ -0,0 +1,12 @@
+include(../basicunix/basicunix.pri)
+
+HEADERS += \
+        $$QT_SOURCE_TREE/src/plugins/platforms/fontdatabases/fontconfig/qfontconfigdatabase.h
+
+SOURCES += \
+        $$QT_SOURCE_TREE/src/plugins/platforms/fontdatabases/fontconfig/qfontconfigdatabase.cpp
+
+INCLUDEPATH += $$QT_SOURCE_TREE/src/plugins/platforms/fontdatabases/fontconfig
+LIBS_PRIVATE += -lfontconfig
+
+
diff --git a/src/plugins/platforms/fontdatabases/fontconfig/qfontconfigdatabase.cpp b/src/plugins/platforms/fontdatabases/fontconfig/qfontconfigdatabase.cpp
new file mode 100644
index 0000000..562cb2d
--- /dev/null
+++ b/src/plugins/platforms/fontdatabases/fontconfig/qfontconfigdatabase.cpp
@@ -0,0 +1,528 @@
+#include "qfontconfigdatabase.h"
+
+#include <QtCore/QList>
+#include <QtGui/private/qfont_p.h>
+
+#include <QtCore/QElapsedTimer>
+
+#include <QtGui/private/qapplication_p.h>
+#include <QtGui/QPlatformScreen>
+
+#include <QtGui/private/qfontengine_ft_p.h>
+#include <QtGui/private/qfontengine_p.h>
+
+
+
+#include <ft2build.h>
+#include FT_TRUETYPE_TABLES_H
+
+#include <fontconfig/fontconfig.h>
+
+#define SimplifiedChineseCsbBit 18
+#define TraditionalChineseCsbBit 20
+#define JapaneseCsbBit 17
+#define KoreanCsbBit 21
+
+static inline bool requiresOpenType(int writingSystem)
+{
+    return ((writingSystem >= QFontDatabase::Syriac && writingSystem <= QFontDatabase::Sinhala)
+            || writingSystem == QFontDatabase::Khmer || writingSystem == QFontDatabase::Nko);
+}
+static inline bool scriptRequiresOpenType(int script)
+{
+    return ((script >= QUnicodeTables::Syriac && script <= QUnicodeTables::Sinhala)
+            || script == QUnicodeTables::Khmer || script == QUnicodeTables::Nko);
+}
+
+static int getFCWeight(int fc_weight)
+{
+    int qtweight = QFont::Black;
+    if (fc_weight <= (FC_WEIGHT_LIGHT + FC_WEIGHT_MEDIUM) / 2)
+        qtweight = QFont::Light;
+    else if (fc_weight <= (FC_WEIGHT_MEDIUM + FC_WEIGHT_DEMIBOLD) / 2)
+        qtweight = QFont::Normal;
+    else if (fc_weight <= (FC_WEIGHT_DEMIBOLD + FC_WEIGHT_BOLD) / 2)
+        qtweight = QFont::DemiBold;
+    else if (fc_weight <= (FC_WEIGHT_BOLD + FC_WEIGHT_BLACK) / 2)
+        qtweight = QFont::Bold;
+
+    return qtweight;
+}
+
+static const char *specialLanguages[] = {
+    "en", // Common
+    "el", // Greek
+    "ru", // Cyrillic
+    "hy", // Armenian
+    "he", // Hebrew
+    "ar", // Arabic
+    "syr", // Syriac
+    "div", // Thaana
+    "hi", // Devanagari
+    "bn", // Bengali
+    "pa", // Gurmukhi
+    "gu", // Gujarati
+    "or", // Oriya
+    "ta", // Tamil
+    "te", // Telugu
+    "kn", // Kannada
+    "ml", // Malayalam
+    "si", // Sinhala
+    "th", // Thai
+    "lo", // Lao
+    "bo", // Tibetan
+    "my", // Myanmar
+    "ka", // Georgian
+    "ko", // Hangul
+    "", // Ogham
+    "", // Runic
+    "km", // Khmer
+    "" // N'Ko
+};
+enum { SpecialLanguageCount = sizeof(specialLanguages) / sizeof(const char *) };
+
+static const ushort specialChars[] = {
+    0, // English
+    0, // Greek
+    0, // Cyrillic
+    0, // Armenian
+    0, // Hebrew
+    0, // Arabic
+    0, // Syriac
+    0, // Thaana
+    0, // Devanagari
+    0, // Bengali
+    0, // Gurmukhi
+    0, // Gujarati
+    0, // Oriya
+    0, // Tamil
+    0xc15, // Telugu
+    0xc95, // Kannada
+    0xd15, // Malayalam
+    0xd9a, // Sinhala
+    0, // Thai
+    0, // Lao
+    0, // Tibetan
+    0x1000, // Myanmar
+    0, // Georgian
+    0, // Hangul
+    0x1681, // Ogham
+    0x16a0, // Runic
+    0,  // Khmer
+    0x7ca // N'Ko
+};
+enum { SpecialCharCount = sizeof(specialChars) / sizeof(ushort) };
+
+// this could become a list of all languages used for each writing
+// system, instead of using the single most common language.
+static const char *languageForWritingSystem[] = {
+    0,     // Any
+    "en",  // Latin
+    "el",  // Greek
+    "ru",  // Cyrillic
+    "hy",  // Armenian
+    "he",  // Hebrew
+    "ar",  // Arabic
+    "syr", // Syriac
+    "div", // Thaana
+    "hi",  // Devanagari
+    "bn",  // Bengali
+    "pa",  // Gurmukhi
+    "gu",  // Gujarati
+    "or",  // Oriya
+    "ta",  // Tamil
+    "te",  // Telugu
+    "kn",  // Kannada
+    "ml",  // Malayalam
+    "si",  // Sinhala
+    "th",  // Thai
+    "lo",  // Lao
+    "bo",  // Tibetan
+    "my",  // Myanmar
+    "ka",  // Georgian
+    "km",  // Khmer
+    "zh-cn", // SimplifiedChinese
+    "zh-tw", // TraditionalChinese
+    "ja",  // Japanese
+    "ko",  // Korean
+    "vi",  // Vietnamese
+    0, // Symbol
+    0, // Ogham
+    0, // Runic
+    0 // N'Ko
+};
+enum { LanguageCount = sizeof(languageForWritingSystem) / sizeof(const char *) };
+
+// Unfortunately FontConfig doesn't know about some languages. We have to test these through the
+// charset. The lists below contain the systems where we need to do this.
+static const ushort sampleCharForWritingSystem[] = {
+    0,     // Any
+    0,  // Latin
+    0,  // Greek
+    0,  // Cyrillic
+    0,  // Armenian
+    0,  // Hebrew
+    0,  // Arabic
+    0, // Syriac
+    0, // Thaana
+    0,  // Devanagari
+    0,  // Bengali
+    0,  // Gurmukhi
+    0,  // Gujarati
+    0,  // Oriya
+    0,  // Tamil
+    0xc15,  // Telugu
+    0xc95,  // Kannada
+    0xd15,  // Malayalam
+    0xd9a,  // Sinhala
+    0,  // Thai
+    0,  // Lao
+    0,  // Tibetan
+    0x1000,  // Myanmar
+    0,  // Georgian
+    0,  // Khmer
+    0, // SimplifiedChinese
+    0, // TraditionalChinese
+    0,  // Japanese
+    0,  // Korean
+    0,  // Vietnamese
+    0, // Symbol
+    0x1681, // Ogham
+    0x16a0, // Runic
+    0x7ca // N'Ko
+};
+enum { SampleCharCount = sizeof(sampleCharForWritingSystem) / sizeof(ushort) };
+
+// Newer FontConfig let's us sort out fonts that contain certain glyphs, but no
+// open type tables for is directly. Do this so we don't pick some strange
+// pseudo unicode font
+static const char *openType[] = {
+    0,     // Any
+    0,  // Latin
+    0,  // Greek
+    0,  // Cyrillic
+    0,  // Armenian
+    0,  // Hebrew
+    0,  // Arabic
+    "syrc",  // Syriac
+    "thaa",  // Thaana
+    "deva",  // Devanagari
+    "beng",  // Bengali
+    "guru",  // Gurmukhi
+    "gurj",  // Gujarati
+    "orya",  // Oriya
+    "taml",  // Tamil
+    "telu",  // Telugu
+    "knda",  // Kannada
+    "mlym",  // Malayalam
+    "sinh",  // Sinhala
+    0,  // Thai
+    0,  // Lao
+    "tibt",  // Tibetan
+    "mymr",  // Myanmar
+    0,  // Georgian
+    "khmr",  // Khmer
+    0, // SimplifiedChinese
+    0, // TraditionalChinese
+    0,  // Japanese
+    0,  // Korean
+    0,  // Vietnamese
+    0, // Symbol
+    0, // Ogham
+    0, // Runic
+    "nko " // N'Ko
+};
+
+void QFontconfigDatabase::populateFontDatabase()
+{
+    FcFontSet  *fonts;
+
+    QString familyName;
+    FcChar8 *value = 0;
+    int weight_value;
+    int slant_value;
+    int spacing_value;
+    FcChar8 *file_value;
+    int indexValue;
+    FcChar8 *foundry_value;
+    FcBool scalable;
+    FcBool antialias;
+
+    {
+        FcObjectSet *os = FcObjectSetCreate();
+        FcPattern *pattern = FcPatternCreate();
+        const char *properties [] = {
+            FC_FAMILY, FC_WEIGHT, FC_SLANT,
+            FC_SPACING, FC_FILE, FC_INDEX,
+            FC_LANG, FC_CHARSET, FC_FOUNDRY, FC_SCALABLE, FC_PIXEL_SIZE, FC_WEIGHT,
+            FC_WIDTH,
+#if FC_VERSION >= 20297
+            FC_CAPABILITY,
+#endif
+            (const char *)0
+        };
+        const char **p = properties;
+        while (*p) {
+            FcObjectSetAdd(os, *p);
+            ++p;
+        }
+        fonts = FcFontList(0, pattern, os);
+        FcObjectSetDestroy(os);
+        FcPatternDestroy(pattern);
+    }
+
+    for (int i = 0; i < fonts->nfont; i++) {
+        if (FcPatternGetString(fonts->fonts[i], FC_FAMILY, 0, &value) != FcResultMatch)
+            continue;
+        //         capitalize(value);
+        familyName = QString::fromUtf8((const char *)value);
+        slant_value = FC_SLANT_ROMAN;
+        weight_value = FC_WEIGHT_MEDIUM;
+        spacing_value = FC_PROPORTIONAL;
+        file_value = 0;
+        indexValue = 0;
+        scalable = FcTrue;
+
+
+        if (FcPatternGetInteger (fonts->fonts[i], FC_SLANT, 0, &slant_value) != FcResultMatch)
+            slant_value = FC_SLANT_ROMAN;
+        if (FcPatternGetInteger (fonts->fonts[i], FC_WEIGHT, 0, &weight_value) != FcResultMatch)
+            weight_value = FC_WEIGHT_MEDIUM;
+        if (FcPatternGetInteger (fonts->fonts[i], FC_SPACING, 0, &spacing_value) != FcResultMatch)
+            spacing_value = FC_PROPORTIONAL;
+        if (FcPatternGetString (fonts->fonts[i], FC_FILE, 0, &file_value) != FcResultMatch)
+            file_value = 0;
+        if (FcPatternGetInteger (fonts->fonts[i], FC_INDEX, 0, &indexValue) != FcResultMatch)
+            indexValue = 0;
+        if (FcPatternGetBool(fonts->fonts[i], FC_SCALABLE, 0, &scalable) != FcResultMatch)
+            scalable = FcTrue;
+        if (FcPatternGetString(fonts->fonts[i], FC_FOUNDRY, 0, &foundry_value) != FcResultMatch)
+            foundry_value = 0;
+        if(FcPatternGetBool(fonts->fonts[i],FC_ANTIALIAS,0,&antialias) != FcResultMatch)
+            antialias = true;
+
+        QSupportedWritingSystems writingSystems;
+        FcLangSet *langset = 0;
+        FcResult res = FcPatternGetLangSet(fonts->fonts[i], FC_LANG, 0, &langset);
+        if (res == FcResultMatch) {
+            for (int i = 1; i < LanguageCount; ++i) {
+                const FcChar8 *lang = (const FcChar8*) languageForWritingSystem[i];
+                if (lang) {
+                    FcLangResult langRes = FcLangSetHasLang(langset, lang);
+                    if (langRes != FcLangDifferentLang)
+                        writingSystems.setSupported(QFontDatabase::WritingSystem(i));
+                }
+            }
+        } else {
+            // we set Other to supported for symbol fonts. It makes no
+            // sense to merge these with other ones, as they are
+            // special in a way.
+            writingSystems.setSupported(QFontDatabase::Other);
+        }
+
+        FcCharSet *cs = 0;
+        res = FcPatternGetCharSet(fonts->fonts[i], FC_CHARSET, 0, &cs);
+        if (res == FcResultMatch) {
+            // some languages are not supported by FontConfig, we rather check the
+            // charset to detect these
+            for (int i = 1; i < SampleCharCount; ++i) {
+                if (!sampleCharForWritingSystem[i])
+                    continue;
+                if (FcCharSetHasChar(cs, sampleCharForWritingSystem[i]))
+                    writingSystems.setSupported(QFontDatabase::WritingSystem(i));
+            }
+        }
+
+#if FC_VERSION >= 20297
+        for (int j = 1; j < LanguageCount; ++j) {
+            if (writingSystems.supported(QFontDatabase::WritingSystem(j))
+                && requiresOpenType(j) && openType[j]) {
+                FcChar8 *cap;
+                res = FcPatternGetString (fonts->fonts[i], FC_CAPABILITY, 0, &cap);
+                if (res != FcResultMatch || !strstr((const char *)cap, openType[j]))
+                    writingSystems.setSupported(QFontDatabase::WritingSystem(j),false);
+            }
+        }
+#endif
+
+        FontFile *fontFile = new FontFile;
+        fontFile->fileName = QLatin1String((const char *)file_value);
+        fontFile->indexValue = indexValue;
+
+        QFont::Style style = (slant_value == FC_SLANT_ITALIC)
+                         ? QFont::StyleItalic
+                         : ((slant_value == FC_SLANT_OBLIQUE)
+                            ? QFont::StyleOblique
+                            : QFont::StyleNormal);
+        int weight = getFCWeight(weight_value);
+
+        double pixel_size = 0;
+        if (!scalable) {
+            int width = 100;
+            FcPatternGetInteger (fonts->fonts[i], FC_WIDTH, 0, &width);
+            FcPatternGetDouble (fonts->fonts[i], FC_PIXEL_SIZE, 0, &pixel_size);
+        }
+
+        QPlatformFontDatabase::registerFont(familyName,QLatin1String((const char *)foundry_value),weight,style,100,antialias,scalable,pixel_size,writingSystems,fontFile);
+//        qDebug() << familyName << (const char *)foundry_value << weight << style << &writingSystems << scalable << true << pixel_size;
+    }
+
+    FcFontSetDestroy (fonts);
+
+    struct FcDefaultFont {
+        const char *qtname;
+        const char *rawname;
+        bool fixed;
+    };
+    const FcDefaultFont defaults[] = {
+        { "Serif", "serif", false },
+        { "Sans Serif", "sans-serif", false },
+        { "Monospace", "monospace", true },
+        { 0, 0, false }
+    };
+    const FcDefaultFont *f = defaults;
+    // aliases only make sense for 'common', not for any of the specials
+    QSupportedWritingSystems ws;
+    ws.setSupported(QFontDatabase::Latin);
+
+    while (f->qtname) {
+        registerFont(f->qtname,"",50,QFont::StyleNormal,100,true,true,0,ws,0);
+        registerFont(f->qtname,"",50,QFont::StyleItalic,100,true,true,0,ws,0);
+        registerFont(f->qtname,"",50,QFont::StyleOblique,100,true,true,0,ws,0);
+        ++f;
+    }
+
+    const FcDefaultFont *s = defaults;
+    QFont font("Sans Serif");
+    font.setPointSize(9);
+    QApplication::setFont(font);
+}
+
+QFontEngine *QFontconfigDatabase::fontEngine(const QFontDef &f, QUnicodeTables::Script script, void *usrPtr)
+{
+    QFontDef fontDef = f;
+
+    QFontEngineFT *engine;
+    FontFile *fontfile = static_cast<FontFile *> (usrPtr);
+    QFontEngine::FaceId fid;
+    fid.filename = fontfile->fileName.toLocal8Bit();
+    fid.index = fontfile->indexValue;
+
+    //try and get the pattern
+    FcPattern *pattern = FcPatternCreate();
+
+    bool antialias = !(fontDef.styleStrategy & QFont::NoAntialias);
+    QFontEngineFT::GlyphFormat format = antialias? QFontEngineFT::Format_A8 : QFontEngineFT::Format_Mono;
+
+    engine = new QFontEngineFT(fontDef);
+
+    FcValue value;
+    value.type = FcTypeString;
+        QByteArray cs = fontDef.family.toUtf8();
+    value.u.s = (const FcChar8 *)cs.data();
+    FcPatternAdd(pattern,FC_FAMILY,value,true);
+
+
+    value.u.s = (const FcChar8 *)fid.filename.data();
+    FcPatternAdd(pattern,FC_FILE,value,true);
+
+    value.type = FcTypeInteger;
+    value.u.i = fid.index;
+    FcPatternAdd(pattern,FC_INDEX,value,true);
+
+    QFontEngineFT::HintStyle default_hint_style;
+
+    if (FcConfigSubstitute(0,pattern,FcMatchPattern)) {
+
+        //hinting
+        int hint_style = 0;
+        if (FcPatternGetInteger (pattern, FC_HINT_STYLE, 0, &hint_style) == FcResultNoMatch)
+            hint_style = QFontEngineFT::HintFull;
+        switch (hint_style) {
+        case FC_HINT_NONE:
+            default_hint_style = QFontEngineFT::HintNone;
+            break;
+        case FC_HINT_SLIGHT:
+            default_hint_style = QFontEngineFT::HintLight;
+            break;
+        case FC_HINT_MEDIUM:
+            default_hint_style = QFontEngineFT::HintMedium;
+            break;
+        default:
+            default_hint_style = QFontEngineFT::HintFull;
+            break;
+        }
+    }
+
+    engine->setDefaultHintStyle(default_hint_style);
+    if (!engine->init(fid,antialias,format)) {
+        delete engine;
+        engine = 0;
+        return engine;
+    }
+    if (engine->invalid()) {
+        delete engine;
+        engine = 0;
+    } else if (scriptRequiresOpenType(script)) {
+        HB_Face hbFace = engine->harfbuzzFace();
+        if (!hbFace || !hbFace->supported_scripts[script]) {
+            delete engine;
+            engine = 0;
+        }
+    }
+
+    return engine;
+}
+
+QStringList QFontconfigDatabase::fallbacksForFamily(const QString family, const QFont::Style &style, const QUnicodeTables::Script &script) const
+{
+    QStringList fallbackFamilies;
+    FcPattern *pattern = FcPatternCreate();
+    if (!pattern)
+        return fallbackFamilies;
+
+    FcValue value;
+    value.type = FcTypeString;
+    QByteArray cs = family.toUtf8();
+    value.u.s = (const FcChar8 *)cs.data();
+    FcPatternAdd(pattern,FC_FAMILY,value,true);
+
+    int slant_value = FC_SLANT_ROMAN;
+    if (style == QFont::StyleItalic)
+        slant_value = FC_SLANT_ITALIC;
+    else if (style == QFont::StyleOblique)
+        slant_value = FC_SLANT_OBLIQUE;
+    FcPatternAddInteger(pattern, FC_SLANT, slant_value);
+
+    if (script != QUnicodeTables::Common && *specialLanguages[script] != '\0') {
+        Q_ASSERT(script < QUnicodeTables::ScriptCount);
+        FcLangSet *ls = FcLangSetCreate();
+        FcLangSetAdd(ls, (const FcChar8*)specialLanguages[script]);
+        FcPatternAddLangSet(pattern, FC_LANG, ls);
+        FcLangSetDestroy(ls);
+    }
+
+    FcConfigSubstitute(0, pattern, FcMatchPattern);
+    FcConfigSubstitute(0, pattern, FcMatchFont);
+
+    FcResult result = FcResultMatch;
+    FcFontSet *fontSet = FcFontSort(0,pattern,FcFalse,0,&result);
+
+    if (fontSet && result == FcResultMatch)
+    {
+        for (int i = 0; i < fontSet->nfont; i++) {
+            FcChar8 *value = 0;
+            if (FcPatternGetString(fontSet->fonts[i], FC_FAMILY, 0, &value) != FcResultMatch)
+                continue;
+            //         capitalize(value);
+            QString familyName = QString::fromUtf8((const char *)value);
+            if (!fallbackFamilies.contains(familyName,Qt::CaseInsensitive)) {
+                fallbackFamilies << familyName;
+            }
+
+        }
+    }
+//    qDebug() << "fallbackFamilies for:" << family << fallbackFamilies;
+
+    return fallbackFamilies;
+}
diff --git a/src/plugins/platforms/fontdatabases/fontconfig/qfontconfigdatabase.h b/src/plugins/platforms/fontdatabases/fontconfig/qfontconfigdatabase.h
new file mode 100644
index 0000000..5945b6e
--- /dev/null
+++ b/src/plugins/platforms/fontdatabases/fontconfig/qfontconfigdatabase.h
@@ -0,0 +1,15 @@
+#ifndef QFONTCONFIGDATABASE_H
+#define QFONTCONFIGDATABASE_H
+
+#include <QPlatformFontDatabase>
+#include "qbasicunixfontdatabase.h"
+
+class QFontconfigDatabase : public QBasicUnixFontDatabase
+{
+public:
+    void populateFontDatabase();
+    QFontEngine *fontEngine(const QFontDef &fontDef, QUnicodeTables::Script script, void *handle);
+    QStringList fallbacksForFamily(const QString family, const QFont::Style &style, const QUnicodeTables::Script &script) const;
+};
+
+#endif // QFONTCONFIGDATABASE_H