move cursor logic to be jit

reform2-keyboard-fw/text_display.c

@@ -35,22 +35,19 @@ void text_display_scroll(text_display_t *display) {
 }
 
 void text_display_putc(text_display_t *display, uint8_t c) {
-  display->cells[display->cursor] = c;
-  display->cursor++;
   if (display->cursor >= display->width * display->height) {
     display->cursor -= display->width;
     text_display_scroll(display);
   }
+  display->cells[display->cursor] = c;
+  display->cursor++;
+  display->dirty = true;
 }
 
 void text_display_write(text_display_t *display, const char *text) {
   while (*text) {
     if (*text == '\n') {
       display->cursor = ((display->cursor / display->width) + 1) * display->width;
-      if (display->cursor >= display->width * display->height) {
-        display->cursor -= display->width;
-        text_display_scroll(display);
-      }
     } else {
       text_display_putc(display, *text);
     }
@@ -59,6 +56,7 @@ void text_display_write(text_display_t *display, const char *text) {
 }
 
 void text_display_flush(text_display_t *display) {
+  if (!display->dirty) return;
   uint8_t x_offset = (DisplayWidth - display->width * display->font->width) / 2;
 
   oled_on();

reform2-keyboard-fw/text_display.h

@@ -27,7 +27,7 @@ typedef struct {
 
 typedef struct {
   uint8_t cells[MAX_HEIGHT * MAX_WIDTH];
-  uint8_t invert[MAX_HEIGHT * MAX_WIDTH / 8];
+  uint8_t invert[(MAX_HEIGHT * MAX_WIDTH + 7) / 8];
   uint8_t width;
   uint8_t height;
   uint8_t cursor;
@@ -35,6 +35,8 @@ typedef struct {
   const monospace_font_t *font;
 } text_display_t;
 
+extern const monospace_font_t font_oranj;
+
 void text_display_init(text_display_t *display, const monospace_font_t *font);
 void text_display_clear(text_display_t *display);
 void text_display_scroll(text_display_t *display);