File Fix-plain-map-and-political-map-showing-no-content.patch of Package marble

From ce6cbb18b1483245ec2e43c84166f68cea60a26b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dennis=20Nienh=C3=BCser?= <nienhueser@kde.org>
Date: Mon, 26 Jun 2017 21:57:53 +0200
Subject: Fix both plain map and political map showing no content at all

Both have neither a texture nor a vector tile layer, and hence no
tile zoom level was set anymore in geometry layer after f847505. Now
a default tile zoom level is calculated in such scenarios.

BUG: 379297
---
 src/lib/marble/MarbleMap.cpp              | 17 ++++++++++-------
 src/lib/marble/layers/VectorTileLayer.cpp |  9 ++++++---
 2 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/src/lib/marble/MarbleMap.cpp b/src/lib/marble/MarbleMap.cpp
index d41c0f1..d62642a 100644
--- a/src/lib/marble/MarbleMap.cpp
+++ b/src/lib/marble/MarbleMap.cpp
@@ -22,6 +22,7 @@
 // Qt
 #include <QTime>
 #include <QRegion>
+#include <QtMath>
 
 // Marble
 #include "layers/FloatItemsLayer.h"
@@ -209,9 +210,6 @@ MarbleMapPrivate::MarbleMapPrivate( MarbleMap *parent, MarbleModel *model ) :
 
     QObject::connect( &m_geometryLayer, SIGNAL(repaintNeeded()),
                       parent, SIGNAL(repaintNeeded()));
-    QObject::connect(&m_vectorTileLayer, SIGNAL(tileLevelChanged(int)), &m_geometryLayer, SLOT(setTileLevel(int)));
-    QObject::connect(&m_vectorTileLayer, SIGNAL(tileLevelChanged(int)), &m_placemarkLayer, SLOT(setTileLevel(int)));
-    QObject::connect(&m_textureLayer, SIGNAL(tileLevelChanged(int)), &m_placemarkLayer, SLOT(setTileLevel(int)));
 
     /*
      * Slot handleHighlight finds all placemarks
@@ -239,9 +236,11 @@ MarbleMapPrivate::MarbleMapPrivate( MarbleMap *parent, MarbleModel *model ) :
                       parent, SLOT(updateTileLevel()) );
     QObject::connect( &m_vectorTileLayer, SIGNAL(tileLevelChanged(int)),
                       parent, SLOT(updateTileLevel()) );
+    QObject::connect( parent, SIGNAL(radiusChanged(int)),
+                      parent, SLOT(updateTileLevel()) );
+
     QObject::connect( &m_textureLayer, SIGNAL(repaintNeeded()),
                       parent, SIGNAL(repaintNeeded()) );
-
     QObject::connect( parent, SIGNAL(visibleLatLonAltBoxChanged(GeoDataLatLonAltBox)),
                       parent, SIGNAL(repaintNeeded()) );
 
@@ -466,7 +465,8 @@ int MarbleMap::preferredRadiusFloor( int radius )
 
 int MarbleMap::tileZoomLevel() const
 {
-    return qMax(d->m_textureLayer.tileZoomLevel(), d->m_vectorTileLayer.tileZoomLevel());
+    auto const tileZoomLevel = qMax(d->m_textureLayer.tileZoomLevel(), d->m_vectorTileLayer.tileZoomLevel());
+    return tileZoomLevel >= 0 ? tileZoomLevel : qMin<int>(qMax<int>(qLn(d->m_viewport.radius()*4/256)/qLn(2.0), 1), d->m_styleBuilder.maximumZoomLevel());
 }
 
 
@@ -828,7 +828,10 @@ void MarbleMapPrivate::setDocument( const QString& key )
 
 void MarbleMapPrivate::updateTileLevel()
 {
-    emit q->tileLevelChanged(q->tileZoomLevel());
+    auto const tileZoomLevel = q->tileZoomLevel();
+    m_geometryLayer.setTileLevel(tileZoomLevel);
+    m_placemarkLayer.setTileLevel(tileZoomLevel);
+    emit q->tileLevelChanged(tileZoomLevel);
 }
 
 // Used to be paintEvent()
diff --git a/src/lib/marble/layers/VectorTileLayer.cpp b/src/lib/marble/layers/VectorTileLayer.cpp
index 864dddf..505d7a6 100644
--- a/src/lib/marble/layers/VectorTileLayer.cpp
+++ b/src/lib/marble/layers/VectorTileLayer.cpp
@@ -133,7 +133,7 @@ RenderState VectorTileLayer::renderState() const
 
 int VectorTileLayer::tileZoomLevel() const
 {
-    int level = 0;
+    int level = -1;
     for (const auto *mapper: d->m_activeTileModels) {
         level = qMax(level, mapper->tileZoomLevel());
     }
@@ -163,7 +163,7 @@ bool VectorTileLayer::render(GeoPainter *painter, ViewportParams *viewport,
         mapper->setViewport(viewport->viewLatLonAltBox());
         level = qMax(level, mapper->tileZoomLevel());
     }
-    if (oldLevel != level) {
+    if (oldLevel != level && level >= 0) {
         emit tileLevelChanged(level);
     }
 
@@ -202,7 +202,10 @@ void VectorTileLayer::setMapTheme(const QVector<const GeoSceneVectorTileDataset
     }
 
     d->updateLayerSettings();
-    emit tileLevelChanged(tileZoomLevel());
+    auto const level = tileZoomLevel();
+    if (level >= 0) {
+        emit tileLevelChanged(level);
+    }
 }
 
 }
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