Minor fixes for markers and empty floor edges

core/src/mindustry/world/blocks/environment/EmptyFloor.java

@@ -12,6 +12,7 @@ public class EmptyFloor extends Floor{
         canShadow = false;
         placeableOn = false;
         solid = true;
+        drawEdgeOut = false;
     }
 
     @Override

core/src/mindustry/world/blocks/logic/CanvasBlock.java

@@ -51,6 +51,7 @@ public class CanvasBlock extends Block{
         config(byte[].class, (CanvasBuild build, byte[] bytes) -> {
             if(build.data.length == bytes.length){
                 System.arraycopy(bytes, 0, build.data, 0, bytes.length);
+                build.invalidated = true;
                 build.updateTexture();
             }
         });
@@ -149,19 +150,19 @@ public class CanvasBlock extends Block{
         public @Nullable Texture texture;
         public byte[] data = new byte[Mathf.ceil(canvasSize * canvasSize * bitsPerPixel / 8f)];
         public int blending;
-        public boolean updated = false;
+        protected boolean invalidated = false;
 
         public void setPixel(int pos, int index){
             if(pos < canvasSize * canvasSize && pos >= 0 && index >= 0 && index < palette.length){
                 setByte(data, pos * bitsPerPixel, index);
-                updated = true;
+                invalidated = true;
             }
         }
 
         public void setPixel(int x, int y, int index){
             if(x >= 0 && y >= 0 && x < canvasSize && y < canvasSize && index >= 0 && index < palette.length){
                 setByte(data, (y * canvasSize + x) * bitsPerPixel, index);
-                updated = true;
+                invalidated = true;
             }
         }
 
@@ -180,7 +181,7 @@ public class CanvasBlock extends Block{
         }
 
         public void updateTexture(){
-            if(headless) return;
+            if(headless || (texture != null && !invalidated)) return;
 
             Pixmap pix = makePixmap(data, previewPixmap);
             if(texture != null){
@@ -188,6 +189,8 @@ public class CanvasBlock extends Block{
             }else{
                 texture = new Texture(pix);
             }
+
+            invalidated = false;
         }
 
         public byte[] packPixmap(Pixmap pixmap){
@@ -260,10 +263,10 @@ public class CanvasBlock extends Block{
                 super.draw();
             }
 
-            if(texture == null || updated){
-                updated = false;
+            if(texture == null || invalidated){
                 updateTexture();
             }
+
             Tmp.tr1.set(texture);
             float pad = blending == 0 ? padding : 0f;