Method draw_text_line_clip

2dlib/pentext.cpp:265–334

*/

void grViewport::draw_text_line_clip(int x, int y, char *str) {
  int ch_y, ch_x, ch_w, ch_h;   // what part of the character to draw
  int i, cur_x, draw_x, draw_y; // where to draw character section
  int h;

  /*	by clipping, we should first determine what our vertical clipping is.  then
          go through each character in the line and determine what is totally clipped,
          partially clipped and by how much, and not clipped at all and draw accordingly
  */
  h = text_Font.height();
  ch_y = 0;
  ch_h = h;
  draw_y = y;
  //	determine each character bitmap y and height to blt.
  if (CLIP_TOP >= y) {
    ch_y = CLIP_TOP - y;
    draw_y = CLIP_TOP;
  }
  if (CLIP_BOTTOM < (y + text_Font.height())) {
    ch_h = CLIP_BOTTOM - y;
  }
  ch_h = ch_h - ch_y; // do this to clip both top and bottom

  cur_x = x;
  for (i = 0; i < (int)strlen(str); i++) {
    uint8_t ch;
    int w;
    ch = (uint8_t)str[i];
    text_Font.get_char_info((int)ch, &w);

    if (ch == GR_COLOR_CHAR) {
      if ((i + 3) >= (int)strlen(str))
        Int3(); // This shouldn't happen!  bad string!
      set_text_color(GR_RGB(str[i + 1], str[i + 2], str[i + 3]));
      i += 4;
      if (i >= (int)strlen(str))
        Int3(); // This shouldn't happen too.
      ch = (uint8_t)str[i];
    } else if (ch == '\t') { // tab char
      int space_width;
      text_Font.get_char_info(' ', &space_width);
      space_width += text_Spacing;
      cur_x = (cur_x + space_width - 1) / space_width * space_width;
    }

    //	do horizontal clipping
    if (((cur_x + w) < CLIP_LEFT) || (cur_x > CLIP_RIGHT)) {
      cur_x += (text_Spacing + w);
    } else {
      ch_x = 0;
      ch_w = w;
      draw_x = cur_x;
      if (CLIP_LEFT > cur_x) {
        ch_x = CLIP_LEFT - cur_x;
        draw_x = CLIP_LEFT;
      }
      if (CLIP_RIGHT < (cur_x + w)) {
        ch_w = CLIP_RIGHT - cur_x;