private void fill(int y0, int x0, int y1, int x1, int c) {
int d0 = width * y0 + x0;
int d1 = width * (y1 - 1) + x1;
if (d0 <= d1) {
Arrays.fill(screen, width * y0 + x0, width * (y1 - 1) + x1, c);
setDirty();
}
}
private void cursor_set_y(int y) {
cy = Math.max(0, Math.min(height - 1, y));
setDirty();
}
private void cursor_set_x(int x) {
eol = false;
cx = Math.max(0, x);
setDirty();
}
private void cursor_right(int n) {
eol = cx + n >= width;
cx = Math.min(width - 1, cx + n);
setDirty();
}
private void cursor_left(int n) {
eol = false;
cx = Math.max(0, cx - n);
setDirty();
}
private void cursor_down(int n) {
cy = Math.min(scroll_area_y1 - 1, cy + n);
setDirty();
}
private void cursor_up(int n) {
cy = Math.max(scroll_area_y0, cy - n);
setDirty();
}
private void poke(int y, int x, int[] s) {
System.arraycopy(s, 0, screen, width * y + x, s.length);
setDirty();
}