wasm: add fixedPitch font

Also define our default font so as to return something we actually have

Task-number: QTBUG-75587
Change-Id: I26e3c62921d369c3017af9796c0a20f7ac06d07c
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

src/3rdparty/wasm/qt_attribution.json

@@ -20,7 +20,7 @@
     "Name": "DejaVu Fonts",
     "QDocModule": "qtgui",
     "QtUsage": "Used for WebAssembly platform.",
-    "Files": "DejaVuSans.ttf",
+    "Files": "DejaVuSans.ttf, DejaVuSansMono.ttf",
     "Description": "The DejaVu fonts are a font family based on the Vera Fonts.",
 
     "Homepage": "https://dejavu-fonts.github.io/",

src/platformsupport/fontdatabases/freetype/qfreetypefontdatabase.cpp

@@ -142,7 +142,6 @@ QStringList QFreeTypeFontDatabase::addTTFile(const QByteArray &fontData, const Q
             weight = QFont::Bold;
 
         bool fixedPitch = (face->face_flags & FT_FACE_FLAG_FIXED_WIDTH);
-
         QSupportedWritingSystems writingSystems;
         // detect symbol fonts
         for (int i = 0; i < face->num_charmaps; ++i) {

src/plugins/platforms/wasm/qwasmfontdatabase.cpp

@@ -38,9 +38,9 @@ void QWasmFontDatabase::populateFontDatabase()
     // Load font file from resources. Currently
     // all fonts needs to be bundled with the nexe
     // as Qt resources.
-    QStringList fontFileNames = QStringList() << QStringLiteral(":/fonts/Vera.ttf")
+    QStringList fontFileNames = QStringList() << QStringLiteral(":/fonts/DejaVuSansMono.ttf")
+                                              << QStringLiteral(":/fonts/Vera.ttf")
                                               << QStringLiteral(":/fonts/DejaVuSans.ttf");
-
     foreach (const QString &fontFileName, fontFileNames) {
         QFile theFont(fontFileName);
         if (!theFont.open(QIODevice::ReadOnly))
@@ -82,5 +82,9 @@ void QWasmFontDatabase::releaseHandle(void *handle)
     QFreeTypeFontDatabase::releaseHandle(handle);
 }
 
+QFont QWasmFontDatabase::defaultFont() const
+{
+    return QFont(QLatin1String("Bitstream Vera Sans"));
+}
 
 QT_END_NAMESPACE

src/plugins/platforms/wasm/qwasmfontdatabase.h

@@ -44,6 +44,7 @@ public:
                                    QChar::Script script) const override;
     QStringList addApplicationFont(const QByteArray &fontData, const QString &fileName) override;
     void releaseHandle(void *handle) override;
+    QFont defaultFont() const override;
 };
 QT_END_NAMESPACE
 #endif

src/plugins/platforms/wasm/qwasmtheme.cpp

@@ -29,15 +29,22 @@
 
 #include "qwasmtheme.h"
 #include <QtCore/qvariant.h>
+#include <QFontDatabase>
 
 QT_BEGIN_NAMESPACE
 
 QWasmTheme::QWasmTheme()
 {
+    QFontDatabase fdb;
+    for (auto family : fdb.families())
+        if (fdb.isFixedPitch(family))
+            fixedFont = new QFont(family);
 }
 
 QWasmTheme::~QWasmTheme()
 {
+    if (fixedFont)
+        delete fixedFont;
 }
 
 QVariant QWasmTheme::themeHint(ThemeHint hint) const
@@ -47,4 +54,12 @@ QVariant QWasmTheme::themeHint(ThemeHint hint) const
     return QPlatformTheme::themeHint(hint);
 }
 
+const QFont *QWasmTheme::font(Font type) const
+{
+    if (type == QPlatformTheme::FixedFont) {
+        return fixedFont;
+    }
+    return nullptr;
+}
+
 QT_END_NAMESPACE

src/plugins/platforms/wasm/qwasmtheme.h

@@ -31,6 +31,7 @@
 #define QWASMTHEME_H
 
 #include <qpa/qplatformtheme.h>
+#include <QtGui/QFont>
 
 QT_BEGIN_NAMESPACE
 
@@ -49,6 +50,8 @@ public:
     ~QWasmTheme();
 
     QVariant themeHint(ThemeHint hint) const override;
+    const QFont *font(Font type) const override;
+    QFont *fixedFont = nullptr;
 };
 
 QT_END_NAMESPACE

src/plugins/platforms/wasm/wasm.pro

@@ -39,7 +39,8 @@ HEADERS = \
 
 wasmfonts.files = \
     ../../../3rdparty/wasm/Vera.ttf \
-    ../../../3rdparty/wasm/DejaVuSans.ttf
+    ../../../3rdparty/wasm/DejaVuSans.ttf \
+    ../../../3rdparty/wasm/DejaVuSansMono.ttf
 wasmfonts.prefix = /fonts
 wasmfonts.base = ../../../3rdparty/wasm
 RESOURCES += wasmfonts