feautre: added undo/redo buttons

The change history is kept in a ring buffer of definite size 2000.

1 files changed, 14 insertions, 11 deletions

diff --git a/src/action.h b/src/action.h
index 7405418..d9b7698 100644
--- a/src/action.h
+++ b/src/action.h
@@ -1,22 +1,25 @@
+typedef struct Action Action;
+
 enum Actions_Types {
+	ACT_NULL,
 	ACT_PIXELSCOLORS,
-}
-
-struct act_pixcol {
-	long int p;      /* Position */
-	unsigned int c;  /* Color */
 };
 
-struct Action {
-	int type;
-	ActUnion act;
+struct action_pixcol {
+	int x, y;      /* Position */
+	unsigned int c;  /* Color */
 };
 
 struct ActionPixelsColors {
 	long int cnt;
-	struct act_pixcol *pix;
-}
+	struct actiton_pixcol *pix;
+};
 
 typedef union {
-	ActionPixelsColors px;
+	struct ActionPixelsColors px;
 } ActUnion;
+
+struct Action {
+	int type;
+	ActUnion act;
+};