If map too small, clear screen before drawing map

Clear map not works on software renderer.

1 files changed, 18 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
 {