Make properties editable

src/window/vram/utils.rs

@@ -39,11 +39,11 @@ pub struct Object {
 
 impl Object {
     pub fn parse(object: [u16; 4]) -> Self {
-        let x = ((object[0] & 0x3ff) << 6 >> 6) as i16;
-        let parallax = ((object[1] & 0x3ff) << 6 >> 6) as i16;
+        let x = ((object[0] & 0x03ff) << 6 >> 6) as i16;
+        let parallax = ((object[1] & 0x03ff) << 6 >> 6) as i16;
         let lon = object[1] & 0x8000 != 0;
         let ron = object[1] & 0x4000 != 0;
-        let y = (object[2] & 0x0ff) as i16;
+        let y = (object[2] & 0x00ff) as i16;
         // Y is stored as the bottom 8 bits of an i16,
         // so only sign extend if it's out of range.
         let y = if y > 224 { y << 8 >> 8 } else { y };
@@ -57,6 +57,30 @@ impl Object {
             data,
         }
     }
+
+    pub fn update(&self, source: &mut [u16; 4]) -> bool {
+        let mut changed = false;
+
+        let new_x = (self.x as u16 & 0x03ff) | (source[0] & 0xfc00);
+        changed |= source[0] != new_x;
+        source[0] = new_x;
+
+        let new_p = if self.lon { 0x8000 } else { 0x0000 }
+            | if self.ron { 0x4000 } else { 0x0000 }
+            | (self.parallax as u16 & 0x3ff)
+            | (source[1] & 0x3c00);
+        changed |= source[1] != new_p;
+        source[1] = new_p;
+
+        let new_y = (self.y as u16 & 0x00ff) | (source[2] & 0xff00);
+        changed |= source[2] != new_y;
+        source[2] = new_y;
+
+        if self.data.update(&mut source[3]) {
+            changed = true;
+        }
+        changed
+    }
 }
 
 pub struct CellData {
@@ -79,6 +103,17 @@ impl CellData {
             palette_index,
         }
     }
+
+    pub fn update(&self, source: &mut u16) -> bool {
+        let new_value = (self.palette_index as u16) << 14
+            | if self.hflip { 0x2000 } else { 0x0000 }
+            | if self.vflip { 0x1000 } else { 0x0000 }
+            | (self.char_index as u16 & 0x07ff)
+            | (*source & 0x0800);
+        let changed = *source != new_value;
+        *source = new_value;
+        changed
+    }
 }
 
 pub fn read_char_row(