void QSGTextMaskMaterial::init(QFontEngine::GlyphFormat glyphFormat)
{
Q_ASSERT(m_font.isValid());
setFlag(Blending, true);
QOpenGLContext *ctx = const_cast<QOpenGLContext *>(QOpenGLContext::currentContext());
Q_ASSERT(ctx != 0);
// The following piece of code will read/write to the font engine's caches,
// potentially from different threads. However, this is safe because this
// code is only called from QQuickItem::updatePaintNode() which is called
// only when the GUI is blocked, and multiple threads will call it in
// sequence. See also QSGRenderContext::invalidate
QRawFontPrivate *fontD = QRawFontPrivate::get(m_font);
if (QFontEngine *fontEngine = fontD->fontEngine) {
if (glyphFormat == QFontEngine::Format_None) {
glyphFormat = fontEngine->glyphFormat != QFontEngine::Format_None
? fontEngine->glyphFormat
: QFontEngine::Format_A32;
}
qreal devicePixelRatio = ctx->surface()->surfaceClass() == QSurface::Window ?
static_cast<QWindow *>(ctx->surface())->devicePixelRatio() : ctx->screen()->devicePixelRatio();
QTransform glyphCacheTransform = QTransform::fromScale(devicePixelRatio, devicePixelRatio);
if (!fontEngine->supportsTransformation(glyphCacheTransform))
glyphCacheTransform = QTransform();
m_glyphCache = fontEngine->glyphCache(ctx, glyphFormat, glyphCacheTransform);
if (!m_glyphCache || int(m_glyphCache->glyphFormat()) != glyphFormat) {
m_glyphCache = new QOpenGLTextureGlyphCache(glyphFormat, glyphCacheTransform);
fontEngine->setGlyphCache(ctx, m_glyphCache.data());
QSGRenderContext *sg = QSGRenderContext::from(ctx);
Q_ASSERT(sg);
sg->registerFontengineForCleanup(fontEngine);
}
}
}
