From 0a474f59d887e857a9575bf81592ad4915b75dd6 Mon Sep 17 00:00:00 2001
From: Wolfgang Hottgenroth <wolfgang.hottgenroth@icloud.com>
Date: Sat, 2 Mar 2024 18:37:39 +0100
Subject: [PATCH] changed pixel bit added

---
 test01.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/test01.c b/test01.c
index 618f091..377ecfe 100644
--- a/test01.c
+++ b/test01.c
@@ -14,7 +14,7 @@ uint8_t canvas[CANVAS_WIDTH][CANVAS_HEIGHT];
 
 #define I_HEIGHT 4
 #define I_WIDTH 1
-#define I_COLOR 1
+#define I_COLOR 2
 
 typedef enum {e_O, e_I} t_shape;
 
@@ -50,6 +50,7 @@ void showCanvas() {
   for (uint8_t y = 0; y < CANVAS_HEIGHT; y++) {
     for (uint8_t x = 0; x < CANVAS_WIDTH; x++) {
       printf("%02x ", canvas[x][y]);
+      canvas[x][y] &= ~0x80;
     }
     printf("\n");
   }
@@ -107,24 +108,25 @@ void drawObject() {
     }
   }
   // draw
+  // the bit7 set marks changed pixels
   switch (object.shape) {
     case e_O:
       switch (object.rotation) {
         case 0:
-          canvas[object.x][object.y] = object.O[0][0];
-          canvas[object.x][object.y+1] = object.O[0][1];
-          canvas[object.x+1][object.y] = object.O[1][0];
-          canvas[object.x+1][object.y+1] = object.O[1][1];
+          canvas[object.x][object.y] = object.O[0][0] | 0x80;
+          canvas[object.x][object.y+1] = object.O[0][1] | 0x80;
+          canvas[object.x+1][object.y] = object.O[1][0] | 0x80;
+          canvas[object.x+1][object.y+1] = object.O[1][1] | 0x80;
           break;
       }
       break;
     case e_I:
       switch (object.rotation) {
         case 0:
-          canvas[object.x][object.y] = object.O[0][0];
-          canvas[object.x][object.y+1] = object.O[0][1];
-          canvas[object.x][object.y+2] = object.O[0][2];
-          canvas[object.x][object.y+3] = object.O[0][3];
+          canvas[object.x][object.y] = object.O[0][0] | 0x80;
+          canvas[object.x][object.y+1] = object.O[0][1] | 0x80;
+          canvas[object.x][object.y+2] = object.O[0][2] | 0x80;
+          canvas[object.x][object.y+3] = object.O[0][3] | 0x80;
           break;
       }
       break;
@@ -163,6 +165,7 @@ int checkCanvasBordersForObject() {
 }
 
 int checkOtherObjectsTouchedForObject() {
+  return 0;
   // return true if another object is touched
   int res = 0;