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Fix memory leak in DirectWrite backend

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This fixes a memory leak due to a missing call to release
on the localized names in populateFamilyAliases(). The
DirectWriteScope makes this automatic when it goes out
of scope.

We did release in the other places, but for hardening
the code a bit, this also adjusts them to use the scope
guard.

Change-Id: I88402fad930e36cdd3a78244941fb53ca214520e
Reviewed-by: Lars Knoll <lars@knoll.priv.no>
This commit is contained in:
Eskil Abrahamsen Blomfeldt 2024-02-01 12:53:16 +01:00
parent 9e64088729
commit ec38f0002d
1 changed files with 24 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
src/gui/text/windows/qwindowsdirectwritefontdatabase.cpp
View File

@ -130,7 +130,7 @@ void QWindowsDirectWriteFontDatabase::populateFamily(const QString &familyName)
const bool antialias = false;
const int size = SMOOTH_SCALABLE;
IDWriteFontList *matchingFonts;
DirectWriteScope<IDWriteFontList> matchingFonts;
if (SUCCEEDED(fontFamily->GetMatchingFonts(DWRITE_FONT_WEIGHT_REGULAR,
DWRITE_FONT_STRETCH_NORMAL,
DWRITE_FONT_STYLE_NORMAL,
@ -138,7 +138,7 @@ void QWindowsDirectWriteFontDatabase::populateFamily(const QString &familyName)
for (uint j = 0; j < matchingFonts->GetFontCount(); ++j) {
IDWriteFont *font;
if (SUCCEEDED(matchingFonts->GetFont(j, &font))) {
IDWriteFont1 *font1 = nullptr;
DirectWriteScope<IDWriteFont1> font1;
if (!SUCCEEDED(font->QueryInterface(__uuidof(IDWriteFont1),
reinterpret_cast<void **>(&font1)))) {
qCWarning(lcQpaFonts) << "COM object does not support IDWriteFont1";
@ -148,27 +148,23 @@ void QWindowsDirectWriteFontDatabase::populateFamily(const QString &familyName)
QString defaultLocaleFamilyName;
QString englishLocaleFamilyName;
IDWriteFontFamily *fontFamily2;
DirectWriteScope<IDWriteFontFamily> fontFamily2;
if (SUCCEEDED(font1->GetFontFamily(&fontFamily2))) {
IDWriteLocalizedStrings *names;
DirectWriteScope<IDWriteLocalizedStrings> names;
if (SUCCEEDED(fontFamily2->GetFamilyNames(&names))) {
defaultLocaleFamilyName = hasDefaultLocale ? localeString(names, defaultLocale) : QString();
englishLocaleFamilyName = localeString(names, englishLocale);
names->Release();
defaultLocaleFamilyName = hasDefaultLocale ? localeString(*names, defaultLocale) : QString();
englishLocaleFamilyName = localeString(*names, englishLocale);
}
fontFamily2->Release();
}
if (defaultLocaleFamilyName.isEmpty() && englishLocaleFamilyName.isEmpty())
englishLocaleFamilyName = familyName;
{
IDWriteLocalizedStrings *names;
DirectWriteScope<IDWriteLocalizedStrings> names;
if (SUCCEEDED(font1->GetFaceNames(&names))) {
QString defaultLocaleStyleName = hasDefaultLocale ? localeString(names, defaultLocale) : QString();
QString englishLocaleStyleName = localeString(names, englishLocale);
QString defaultLocaleStyleName = hasDefaultLocale ? localeString(*names, defaultLocale) : QString();
QString englishLocaleStyleName = localeString(*names, englishLocale);
QFont::Stretch stretch = fromDirectWriteStretch(font1->GetStretch());
QFont::Style style = fromDirectWriteStyle(font1->GetStyle());
@ -177,9 +173,9 @@ void QWindowsDirectWriteFontDatabase::populateFamily(const QString &familyName)
qCDebug(lcQpaFonts) << "Family" << familyName << "has english variant" << englishLocaleStyleName << ", in default locale:" << defaultLocaleStyleName << stretch << style << weight << fixed;
IDWriteFontFace *face = nullptr;
DirectWriteScope<IDWriteFontFace> face;
if (SUCCEEDED(font->CreateFontFace(&face))) {
QSupportedWritingSystems writingSystems = supportedWritingSystems(face);
QSupportedWritingSystems writingSystems = supportedWritingSystems(*face);
if (!englishLocaleStyleName.isEmpty() || defaultLocaleStyleName.isEmpty()) {
qCDebug(lcQpaFonts) << "Font" << englishLocaleFamilyName << englishLocaleStyleName << "supports writing systems:" << writingSystems;
@ -195,7 +191,7 @@ void QWindowsDirectWriteFontDatabase::populateFamily(const QString &familyName)
size,
fixed,
writingSystems,
new FontHandle(face, englishLocaleFamilyName));
new FontHandle(*face, englishLocaleFamilyName));
}
if (!defaultLocaleFamilyName.isEmpty() && defaultLocaleFamilyName != englishLocaleFamilyName) {
@ -210,22 +206,13 @@ void QWindowsDirectWriteFontDatabase::populateFamily(const QString &familyName)
size,
fixed,
writingSystems,
new FontHandle(face, defaultLocaleFamilyName));
new FontHandle(*face, defaultLocaleFamilyName));
}
face->Release();
}
names->Release();
}
}
font1->Release();
font->Release();
}
}
matchingFonts->Release();
}
}
@ -306,10 +293,10 @@ bool QWindowsDirectWriteFontDatabase::populateFamilyAliases(const QString &missi
DirectWriteScope<IDWriteFont1> font1;
if (SUCCEEDED(font->QueryInterface(__uuidof(IDWriteFont1),
reinterpret_cast<void **>(&font1)))) {
IDWriteLocalizedStrings *names;
DirectWriteScope<IDWriteLocalizedStrings> names;
if (SUCCEEDED(font1->GetFaceNames(&names))) {
wchar_t englishLocale[] = L"en-us";
QString englishLocaleStyleName = localeString(names, englishLocale);
QString englishLocaleStyleName = localeString(*names, englishLocale);
QFont::Stretch stretch = fromDirectWriteStretch(font1->GetStretch());
QFont::Style style = fromDirectWriteStyle(font1->GetStyle());
@ -747,47 +734,45 @@ void QWindowsDirectWriteFontDatabase::populateFontDatabase()
DWRITE_FONT_FAMILY_MODEL_TYPOGRAPHIC,
&fontCollection))) {
for (uint i = 0; i < fontCollection->GetFontFamilyCount(); ++i) {
IDWriteFontFamily2 *fontFamily;
DirectWriteScope<IDWriteFontFamily2> fontFamily;
if (SUCCEEDED(fontCollection->GetFontFamily(i, &fontFamily))) {
QString defaultLocaleName;
QString englishLocaleName;
IDWriteLocalizedStrings *names;
DirectWriteScope<IDWriteLocalizedStrings> names;
if (SUCCEEDED(fontFamily->GetFamilyNames(&names))) {
if (hasDefaultLocale)
defaultLocaleName = localeString(names, defaultLocale);
defaultLocaleName = localeString(*names, defaultLocale);
englishLocaleName = localeString(names, englishLocale);
englishLocaleName = localeString(*names, englishLocale);
}
qCDebug(lcQpaFonts) << "Registering font, english name = " << englishLocaleName << ", name in current locale = " << defaultLocaleName;
if (!defaultLocaleName.isEmpty()) {
registerFontFamily(defaultLocaleName);
m_populatedFonts.insert(defaultLocaleName, fontFamily);
m_populatedFonts.insert(defaultLocaleName, *fontFamily);
fontFamily->AddRef();
if (defaultLocaleName == defaultFontName && defaultFontName != systemDefaultFontName) {
qDebug(lcQpaFonts) << "Adding default font" << systemDefaultFontName << "as alternative to" << defaultLocaleName;
m_populatedFonts.insert(systemDefaultFontName, fontFamily);
m_populatedFonts.insert(systemDefaultFontName, *fontFamily);
fontFamily->AddRef();
}
}
if (!englishLocaleName.isEmpty() && englishLocaleName != defaultLocaleName) {
registerFontFamily(englishLocaleName);
m_populatedFonts.insert(englishLocaleName, fontFamily);
m_populatedFonts.insert(englishLocaleName, *fontFamily);
fontFamily->AddRef();
if (englishLocaleName == defaultFontName && defaultFontName != systemDefaultFontName) {
qDebug(lcQpaFonts) << "Adding default font" << systemDefaultFontName << "as alternative to" << englishLocaleName;
m_populatedFonts.insert(systemDefaultFontName, fontFamily);
m_populatedFonts.insert(systemDefaultFontName, *fontFamily);
fontFamily->AddRef();
}
}
fontFamily->Release();
}
}
}
@ -812,10 +797,9 @@ QFont QWindowsDirectWriteFontDatabase::defaultFont() const
bool QWindowsDirectWriteFontDatabase::supportsVariableApplicationFonts() const
{
QSharedPointer<QWindowsFontEngineData> fontEngineData = data();
IDWriteFactory5 *factory5 = nullptr;
DirectWriteScope<IDWriteFactory5> factory5;
if (SUCCEEDED(fontEngineData->directWriteFactory->QueryInterface(__uuidof(IDWriteFactory5),
reinterpret_cast<void **>(&factory5)))) {
factory5->Release();
return true;
}