If map too small, clear screen before drawing map

Clear map not works on software renderer.

3 files changed, 25 insertions, 1 deletions

diff --git a/src/resources/map/map.cpp b/src/resources/map/map.cpp
index ae7570cda..2128cdcd3 100644
--- a/src/resources/map/map.cpp
+++ b/src/resources/map/map.cpp
@@ -163,7 +163,8 @@ Map::Map(const std::string &name,
     mCachedDraw(false),
 #endif  // USE_OPENGL
     mCustom(false),
-    mDrawOnlyFringe(false)
+    mDrawOnlyFringe(false),
+    mClear(false)
 {
     config.addListener("OverlayDetail", this);
     config.addListener("guialpha", this);
@@ -340,6 +341,9 @@ void Map::draw(Graphics *restrict const graphics,
     if (localPlayer == nullptr)
         return;
 
+    if (mClear)
+        mainGraphics->clearScreen();
+
     BLOCK_START("Map::draw")
     // Calculate range of tiles which are on-screen
     const int endPixelY = graphics->mHeight + scrollY + mTileHeight - 1
@@ -1799,6 +1803,19 @@ int Map::calcMemoryChilds(const int level) const
     return sz;
 }
 
+void Map::screenResized()
+{
+    if (mWidth * mapTileSize < mainGraphics->mWidth ||
+        mHeight * mapTileSize < mainGraphics->mHeight)
+    {
+        mClear = true;
+    }
+    else
+    {
+        mClear = false;
+    }
+}
+
 #ifdef USE_OPENGL
 int Map::getAtlasCount() const restrict2
 {
diff --git a/src/resources/map/map.h b/src/resources/map/map.h
index 74ffdb8ef..6659d7a13 100644
--- a/src/resources/map/map.h
+++ b/src/resources/map/map.h
@@ -372,6 +372,8 @@ class Map final : public Properties,
         std::string getCounterName() const override final
         { return mName; }
 
+        void screenResized();
+
     protected:
         friend class Actor;
         friend class Minimap;
@@ -500,6 +502,7 @@ class Map final : public Properties,
         bool mCachedDraw;
         bool mCustom;
         bool mDrawOnlyFringe;
+        bool mClear;
 };
 
 #endif  // RESOURCES_MAP_MAP_H
diff --git a/src/resources/mapreader.cpp b/src/resources/mapreader.cpp
index c74521817..390fb9e3d 100644
--- a/src/resources/mapreader.cpp
+++ b/src/resources/mapreader.cpp
@@ -35,6 +35,8 @@
 
 #include "fs/virtfs/fs.h"
 
+#include "render/graphics.h"
+
 #include "resources/map/map.h"
 #include "resources/map/mapheights.h"
 #include "resources/map/maplayer.h"
@@ -360,6 +362,8 @@ Map *MapReader::readMap(XmlNodePtrConst node, const std::string &path)
         w, h,
         tilew, tileh);
 
+    map->screenResized();
+
     const std::string fileName = path.substr(path.rfind(dirSeparator) + 1);
     map->setProperty("shortName", fileName);