[core] add meta mobileWidth and mobileHeight params

haxetool/core.js

@@ -42,10 +42,13 @@ class Config {
             company: null,
             width: 800,
             height: 600,
+            mobileWidth: null,
+            mobileHeight: null,
             fps: 60,
         };
         if (params) {
             this.update(params);
+            this.afterUpdate();
         }
     }
 
@@ -68,12 +71,18 @@ class Config {
         if (this.meta.icon) this.icon = Config.absolutePath(this.meta.icon);
     }
 
+    afterUpdate() {
+        if (this.meta.mobileWidth === null) this.meta.mobileWidth = this.meta.width;
+        if (this.meta.mobileHeight === null) this.meta.mobileHeight = Math.round(this.meta.mobileWidth / 1.777777778);
+    }
+
     branch(params) {
         const result = new Config();
         for (const params of this._params) {
             result.update(params);
         }
         result.update(params);
+        result.afterUpdate();
         return result;
     }
 }