truncate display_block area if too large

5 years ago · 6a4b62579d
parent 0dbd2a14d7
commit 6a4b62579d
1 changed files with 3 additions and 3 deletions
--- a/lcd.c
+++ b/lcd.c
@ -465,9 +465,9 @@ uint8_t lcd_check_buffer(uint8_t x, uint8_t y) {
    return displayBuffer[(y / (DISPLAY_HEIGHT/8))][x] & (1 << (y % (DISPLAY_HEIGHT/8)));
 }
 void lcd_display_block(uint8_t x, uint8_t line, uint8_t width) {
-    if (line > (DISPLAY_HEIGHT/8-1)) return;
-    if (x + width > DISPLAY_WIDTH - 1) {
-        width = DISPLAY_WIDTH - x - 1;
+    if (line > (DISPLAY_HEIGHT/8-1) || x > DISPLAY_WIDTH - 1){return;}
+    if (x + width > DISPLAY_WIDTH) { // no -1 here, x alone is width 1
+        width = DISPLAY_WIDTH - x;
    }
    lcd_goto_xpix_y(x,line);
    lcd_data(&displayBuffer[line][x], width);