1 files changed, 33 insertions, 5 deletions
diff --git a/src/block/extension/graphiccontrol.rs b/src/block/extension/graphiccontrol.rs
index 0d4edd1..830dff4 100644
--- a/src/block/extension/graphiccontrol.rs
+++ b/src/block/extension/graphiccontrol.rs
@@ -1,4 +1,4 @@
-use std::convert::TryInto;
+use std::{convert::TryInto, fmt};
 
 #[derive(Clone, Debug)]
 pub struct GraphicControl {
@@ -21,22 +21,36 @@ impl GraphicControl {
             transparency_index,
         };
 
-        ret.disposal_method(disposal_method);
+        ret.set_disposal_method(disposal_method);
         ret.user_input(user_input_flag);
         ret.transparency(transparency_flag);
 
         ret
     }
 
-    pub fn disposal_method(&mut self, method: DisposalMethod) {
+    pub fn disposal_method(&self) -> Option<DisposalMethod> {
+        match self.packed & 0b000_111_00 {
+            0b000_000_00 => Some(DisposalMethod::NoAction),
+            0b000_100_00 => Some(DisposalMethod::DoNotDispose),
+            0b000_010_00 => Some(DisposalMethod::RestoreBackground),
+            0b000_110_00 => Some(DisposalMethod::RestorePrevious),
+            _ => None,
+        }
+    }
+
+    pub fn set_disposal_method(&mut self, method: DisposalMethod) {
         match method {
-            DisposalMethod::Clear => self.packed &= 0b111_000_1_1,
+            DisposalMethod::NoAction => self.packed &= 0b111_000_1_1,
             DisposalMethod::DoNotDispose => self.packed |= 0b000_100_0_0,
             DisposalMethod::RestoreBackground => self.packed |= 0b000_010_0_0,
             DisposalMethod::RestorePrevious => self.packed |= 0b000_110_0_0,
         };
     }
 
+    pub fn transparency_index(&self) -> u8 {
+        self.transparency_index
+    }
+
     pub fn user_input(&mut self, flag: bool) {
         if flag {
             self.packed |= 0b000_000_1_0;
@@ -78,9 +92,23 @@ impl From<[u8; 4]> for GraphicControl {
     }
 }
 
+#[derive(Clone, Copy, Debug, PartialEq)]
 pub enum DisposalMethod {
-    Clear,
+    NoAction,
     DoNotDispose,
     RestoreBackground,
     RestorePrevious,
 }
+
+impl fmt::Display for DisposalMethod {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let st = match self {
+            DisposalMethod::NoAction => "Dispose as Normal",
+            DisposalMethod::DoNotDispose => "No Dispose",
+            DisposalMethod::RestoreBackground => "Restore to background",
+            DisposalMethod::RestorePrevious => "Restore previous image",
+        };
+
+        write!(f, "{}", st)
+    }
+}