Improve handling oof corrupted PNG images (resolves openfl/openfl#1999)

src/lime/graphics/Image.hx

@@ -724,8 +724,11 @@ class Image {
 
 		if (bytes == null) return null;
 		var image = new Image ();
-		image.__fromBytes (bytes);
-		return image;
+		if (image.__fromBytes (bytes)) {
+			return image;
+		} else {
+			return null;
+		}
 
 	}
 
@@ -768,8 +771,11 @@ class Image {
 
 		if (path == null) return null;
 		var image = new Image ();
-		image.__fromFile (path);
-		return image;
+		if (image.__fromFile (path)) {
+			return image;
+		} else {
+			return null;
+		}
 
 	}
 
@@ -1694,7 +1700,7 @@ class Image {
 	}
 
 
-	@:noCompletion private function __fromBytes (bytes:Bytes, onload:Image->Void = null):Void {
+	@:noCompletion private function __fromBytes (bytes:Bytes, onload:Image->Void = null):Bool {
 
 		#if (js && html5)
 
@@ -1720,6 +1726,7 @@ class Image {
 			}
 
 			__fromBase64 (__base64Encode (bytes), type, onload);
+			return true;
 
 		#elseif (lime_cffi && !macro)
 
@@ -1744,6 +1751,8 @@ class Image {
 
 				}
 
+				return true;
+
 			}
 
 		#else
@@ -1752,10 +1761,12 @@ class Image {
 
 		#end
 
+		return false;
+
 	}
 
 
-	@:noCompletion private function __fromFile (path:String, onload:Image->Void = null, onerror:Void->Void = null):Void {
+	@:noCompletion private function __fromFile (path:String, onload:Image->Void = null, onerror:Void->Void = null):Bool {
 
 		#if (kha && !macro)
 
@@ -1798,6 +1809,8 @@ class Image {
 
 					}
 
+					return true;
+
 				}
 
 			} catch (e:Dynamic) {}
@@ -1852,6 +1865,8 @@ class Image {
 			// (issue #1019768)
 			if (image.complete) { }
 
+			return true;
+
 		#elseif (lime_cffi || java)
 
 			var buffer:ImageBuffer = null;
@@ -1921,6 +1936,8 @@ class Image {
 
 				}
 
+				return true;
+
 			}
 
 		#else
@@ -1929,6 +1946,8 @@ class Image {
 
 		#end
 
+		return false;
+
 	}