issue #2053

csrc/u8g2_line.c

@@ -81,7 +81,7 @@ void u8g2_DrawLine(u8g2_t *u8g2, u8g2_uint_t x1, u8g2_uint_t y1, u8g2_uint_t x2,
       u8g2_DrawPixel(u8g2, x, y); 
     else 
       u8g2_DrawPixel(u8g2, y, x); 
-    err -= (uint8_t)dy;
+    err -= (u8g2_uint_t)dy;
     if ( err < 0 ) 
     {
       y += (u8g2_uint_t)ystep;

sys/sdl/issue2053/Makefile

@@ -0,0 +1,12 @@
+CFLAGS = -g -Wall -I../../../csrc/.  `sdl2-config --cflags`
+
+SRC = $(shell ls ../../../csrc/*.c) $(shell ls ../common/*.c ) main.c 
+
+OBJ = $(SRC:.c=.o)
+
+helloworld: $(OBJ) 
+	$(CC) $(CFLAGS) $(LDFLAGS) $(OBJ) `sdl2-config --libs` -o u8g2_sdl
+
+clean:	
+	-rm $(OBJ) u8g2_sdl
+

sys/sdl/issue2053/main.c

@@ -0,0 +1,61 @@
+
+#include "u8g2.h"
+#include <stdio.h>
+#include <string.h>
+
+
+char str1[100];
+char str2[100];
+  
+u8g2_t u8g2;
+
+int main(void)
+{
+  int x, y;
+  int k;
+  char s[10] = "123";
+  
+  s[0] += 115;
+  s[1] += 115;
+
+  
+  u8g2_SetupBuffer_SDL_128x64_4(&u8g2, &u8g2_cb_r0);
+  u8x8_InitDisplay(u8g2_GetU8x8(&u8g2));
+  u8x8_SetPowerSave(u8g2_GetU8x8(&u8g2), 0);  
+  
+  
+  x = 4;  // use as height for the box
+  y = 0;
+  
+  for(;;)
+  {
+    u8g2_FirstPage(&u8g2);
+    do
+    {
+      u8g2_DrawLine(&u8g2, 0, 0, 255, 255);
+      u8g2_DrawLine(&u8g2, 0, 2, 256, 256+2);
+    } while( u8g2_NextPage(&u8g2) );
+    
+    do
+    {
+      k = u8g_sdl_get_key();
+    } while( k < 0 );
+    
+    if ( k == 273 ) y -= 1;
+    if ( k == 274 ) y += 1;
+    if ( k == 276 ) x -= 1;
+    if ( k == 275 ) x += 1;
+    
+    if ( k == 'e' ) y -= 1;
+    if ( k == 'x' ) y += 1;
+    if ( k == 's' ) x -= 1;
+    if ( k == 'd' ) x += 1;
+    if ( k == 'q' ) break;
+    
+    if ( x < 0 )
+      x = 0;
+    
+  }
+  return 0;
+}
+