D

D
Added code to look at safe area of TV to

c/app

@@ -34,6 +34,8 @@
 
 #define APP_NAME  "SaverAni"
 
+#define ModeFiles_SafeArea    0x4d481   /* Safe area SWI */
+
 #define OSKB_XEIG_FN     4    /* parameters to OS_ReadModeVariable   */
 #define OSKB_YEIG_FN     5    /* to read screen parameters such as   */
 #define OSKB_XLIMIT_FN   11   /* number of bits per pixel and        */
@@ -48,6 +50,11 @@
 #define LOOP_IMAGE  12        /* First Sprite of Looping Sequence    */
 #define MAX_IMAGE   18        /* Last Sprite of Looping Sequence     */
 
+#define LEFT_WASTE    4       /* Amount of blank space left of sprite */
+#define RIGHT_WASTE  16       /* Amount of blank space right of sprite */
+#define TOP_WASTE     4       /* Amount of blank space at top of sprite */
+#define BOTTOM_WASTE 10       /* Amount of blank space at bottom of sprite */
+
 #define PI 3.14159265
 
 /***************************************************************************/
@@ -87,6 +94,16 @@ int current_image;                /* The current image number */
 BOOL intro_done = FALSE;          /* Has the intro animation been done */
 BOOL sprites_loaded = FALSE;      /* Are sprites present in memory ? */
 
+int left_edge;                    /* Left limit of movement */
+int right_edge;                   /* Right limit of movement */
+int top_edge;                     /* Top limit of movement */
+int bottom_edge;                  /* Bottom limit of movement */
+
+int left_safearea;                /* Left edge of safe area */
+int right_safearea;               /* Right edge of safe area */
+int top_safearea;                 /* Top edge of safe area */
+int bottom_safearea;              /* Bottom edge of safe area */
+
 /***************************************/
 
 /* Read the mode variable defined in the parameter */
@@ -161,6 +178,49 @@ static int calc_to_nearest_even_number(int value)
   return (value);
 }
 
+/* Set up the safearea x,y values for the current mode */
+static void set_up_safearea_values(void)
+{
+  _kernel_swi_regs regs;
+  _kernel_oserror *err;
+
+  err = _kernel_swi(ModeFiles_SafeArea, &regs, &regs);
+  if (err)
+  {
+    left_safearea = 0;
+    right_safearea = xscreenlimit;
+    bottom_safearea = 0;
+    top_safearea = yscreenlimit;
+  }
+  else
+  {
+    left_safearea = regs.r[0];
+    right_safearea = regs.r[2];
+    bottom_safearea = regs.r[1];
+    top_safearea = regs.r[3];
+  }
+}
+
+/* Calculate the max/min x/y positions for the sprite */
+static void calc_max_coords_for_current_mode_and_sprite(void)
+{
+  set_up_safearea_values();
+
+  left_edge = left_safearea - LEFT_WASTE;
+  calc_to_nearest_even_number(left_edge);
+
+  right_edge = right_safearea + RIGHT_WASTE;
+  right_edge -= width;
+  calc_to_nearest_even_number(right_edge);
+
+  top_edge = top_safearea + TOP_WASTE;
+  top_edge -= height;
+  calc_to_nearest_even_number(top_edge);
+
+  bottom_edge = bottom_safearea - BOTTOM_WASTE;
+  calc_to_nearest_even_number(bottom_edge);
+}
+
 /***************************************************************************/
 
 /* Read the current sprite size */
@@ -237,27 +297,27 @@ static void calculate_next_position(void)
 {
   xpos += x_step;
   ypos += y_step;
-  if (xpos < 0)
+  if (xpos < left_edge)
   {
-    xpos = 0;
+    xpos = left_edge;
     direction = 170 - direction + random(20);
     calculate_step_distance();
   }
-  if (xpos > (xscreenlimit - width))
+  if (xpos > right_edge)
   {
-    xpos = (xscreenlimit - width);
+    xpos = right_edge;
     direction = 170 - direction + random(20);
     calculate_step_distance();
   }
-  if (ypos < 0)
+  if (ypos < bottom_edge)
   {
-    ypos = 0;
+    ypos = bottom_edge;
     direction = 10 - direction - random(20);
     calculate_step_distance();
   }
-  if (ypos > (yscreenlimit - height))
+  if (ypos > top_edge)
   {
-    ypos = (yscreenlimit - height);
+    ypos = top_edge;
     direction = 10 - direction - random(20);
     calculate_step_distance();
   }
@@ -324,6 +384,7 @@ static void plot_intro_animation(void)
     }
   }
   read_sprite_size(current_image);
+  calc_max_coords_for_current_mode_and_sprite();
   xpos += (old_width - width);       /* The looping sprites are smaller */
   intro_done = TRUE;
 }