fixed messed up scaling code

src/gsa_render_to_screen.rs

@@ -85,19 +85,20 @@ pub(crate) fn render_to_window(
     src: &mut [u8],
     palette: &[Rgb; 256],
     window_size: IVec2,
+    screen_size: IVec2,
     scale: usize,
     off_x: usize,
     off_y: usize,
 ) {
     let start = window_size.x as usize * off_y;
-    let end = start + window_size.x as usize * window_size.y as usize * scale;
+    let end = start + window_size.x as usize * screen_size.y as usize * scale;
     for (y, row) in target[start..end]
         .chunks_exact_mut(window_size.x as usize * scale)
         .enumerate()
     {
         let y = y as i32;
-        for x in 0..window_size.x as usize {
+        for x in 0..screen_size.x as usize {
-            let p = src[x + y as usize * window_size.x as usize];
+            let p = src[x + y as usize * screen_size.x as usize];
 
             for scaley in 0..scale {
                 for scalex in 0..scale {

src/mapedit.rs

@@ -152,8 +152,8 @@ pub(crate) fn run_mapedit() {
                 },
                 WindowEvent::CursorMoved { position, .. } => {
                     let new_pos = IVec2 {
-                        x: position.x as i32,
+                        x: position.x as i32 / 2,
-                        y: position.y as i32,
+                        y: position.y as i32 / 2,
                     };
                     let delta = new_pos - *mouse_pos;
                     if *middle_down {
@@ -233,15 +233,15 @@ pub(crate) fn run_mapedit() {
                     )
                     .unwrap();
                 let mut screen_buffer =
-                    vec![TRANSPARENT; size.width as usize * size.height as usize];
+                    vec![TRANSPARENT; size.width as usize * size.height as usize / 4];
                 let mut window_buffer = surface.buffer_mut().unwrap();
                 render_to_screen(
                     &mut screen_buffer,
                     &gsa,
                     &tileset,
                     IVec2 {
-                        x: size.width as i32,
+                        x: size.width as i32 / 2,
-                        y: size.height as i32,
+                        y: size.height as i32 / 2,
                     },
                 );
                 render_to_screen(
@@ -249,8 +249,8 @@ pub(crate) fn run_mapedit() {
                     &gsa2,
                     &tileset,
                     IVec2 {
-                        x: size.width as i32,
+                        x: size.width as i32 / 2,
-                        y: size.height as i32,
+                        y: size.height as i32 / 2,
                     },
                 );
                 render_to_window(
@@ -261,7 +261,11 @@ pub(crate) fn run_mapedit() {
                         x: size.width as i32,
                         y: size.height as i32,
                     },
-                    1,
+                    IVec2 {
+                        x: size.width as i32 / 2,
+                        y: size.height as i32 / 2,
+                    },
+                    2,
                     0,
                     0,
                 );

src/run.rs

@@ -212,6 +212,10 @@ pub fn run<TGame: 'static>(
                             x: size.width as i32,
                             y: size.height as i32,
                         },
+                        IVec2 {
+                            x: SCREEN_WIDTH as i32,
+                            y: SCREEN_HEIGHT as i32,
+                        },
                         *scale,
                         *off_x,
                         *off_y,