Feature/displaymode scale (#176)

* Add scale fit display mode

* Update new Kotlin files

Co-authored-by: nonononono <dev@nononono>

mjpeg-view/src/main/java/com/github/niqdev/mjpeg/AbstractMjpegView.kt

@@ -14,6 +14,7 @@ abstract class AbstractMjpegView : MjpegView {
         protected const val POSITION_LOWER_RIGHT = 6
         protected const val SIZE_STANDARD = 1
         protected const val SIZE_BEST_FIT = 4
+        protected const val SIZE_SCALE_FIT = 16
         protected const val SIZE_FULLSCREEN = 8
     }
 }

mjpeg-view/src/main/java/com/github/niqdev/mjpeg/DisplayMode.kt

@@ -1,5 +1,5 @@
 package com.github.niqdev.mjpeg
 
 enum class DisplayMode(val value: Int) {
-    STANDARD(1), BEST_FIT(4), FULLSCREEN(8);
+    STANDARD(1), BEST_FIT(4), SCALE_FIT(16), FULLSCREEN(8);
 }

mjpeg-view/src/main/java/com/github/niqdev/mjpeg/MjpegViewDefault.java

@@ -384,6 +384,18 @@ private Rect destRect(int bmw, int bmh) {
                 tempy = (dispHeight / 2) - (bmh / 2);
                 return new Rect(tempx, tempy, bmw + tempx, bmh + tempy);
             }
+            if (displayMode == MjpegViewDefault.SIZE_SCALE_FIT) {
+                float bmasp = ((float) bmw / (float) bmh * dispWidth);
+                tempx = 0;
+                tempy = 0;
+                if(bmw < dispWidth){
+                    bmw = dispWidth;
+                    bmh = (int) bmasp;
+                    // set it to the center height
+                    tempy = ((dispWidth - bmh) / 2);
+                }
+                return new Rect(tempx, tempy, bmw, bmh + tempy);
+            }
             if (displayMode == MjpegViewDefault.SIZE_FULLSCREEN)
                 return new Rect(0, 0, dispWidth, dispHeight);
             return null;