src/libgame/toons.c

   1 /***********************************************************
   2 * Artsoft Retro-Game Library                               *
   3 *----------------------------------------------------------*
   4 * (c) 1995-2002 Artsoft Entertainment                      *
   5 *               Holger Schemel                             *
   6 *               Detmolder Strasse 189                      *
   7 *               33604 Bielefeld                            *
   8 *               Germany                                    *
   9 *               e-mail: info@artsoft.org                   *
  10 *----------------------------------------------------------*
  11 * toons.c                                                  *
  12 ***********************************************************/
  13
  14 #include "toons.h"
  15 #include "misc.h"
  16
  17
  18 /* values for toon animation */
  19 #define ANIM_START      0
  20 #define ANIM_CONTINUE   1
  21 #define ANIM_STOP       2
  22
  23
  24 static struct ToonScreenInfo screen_info;
  25
  26 void InitToonScreen(Bitmap **toon_bitmap_array,
  27                     Bitmap *save_buffer,
  28                     void (*update_function)(void),
  29                     void (*prepare_backbuffer_function)(void),
  30                     boolean (*redraw_needed_function)(void),
  31                     struct ToonInfo *toons, int num_toons,
  32                     int startx, int starty,
  33                     int width, int height)
  34 {
  35   screen_info.toon_bitmap_array = toon_bitmap_array;
  36   screen_info.save_buffer = save_buffer;
  37   screen_info.update_function = update_function;
  38   screen_info.prepare_backbuffer_function = prepare_backbuffer_function;
  39   screen_info.redraw_needed_function = redraw_needed_function;
  40   screen_info.toons = toons;
  41   screen_info.num_toons = num_toons;
  42   screen_info.startx = startx;
  43   screen_info.starty = starty;
  44   screen_info.width = width;
  45   screen_info.height = height;
  46 }
  47
  48 void DrawAnim(Bitmap *toon_bitmap, GC toon_clip_gc,
  49               int src_x, int src_y, int width, int height,
  50               int dest_x, int dest_y, int pad_x, int pad_y)
  51 {
  52   int buf_x = DOOR_GFX_PAGEX3, buf_y = DOOR_GFX_PAGEY1;
  53
  54 #if 1
  55   /* special method to avoid flickering interference with BackToFront() */
  56   BlitBitmap(backbuffer, screen_info.save_buffer, dest_x-pad_x, dest_y-pad_y,
  57              width+2*pad_x, height+2*pad_y, buf_x, buf_y);
  58   SetClipOrigin(toon_bitmap, toon_clip_gc, dest_x-src_x, dest_y-src_y);
  59   BlitBitmapMasked(toon_bitmap, backbuffer,
  60                    src_x, src_y, width, height, dest_x, dest_y);
  61   BlitBitmap(backbuffer, window, dest_x-pad_x, dest_y-pad_y,
  62              width+2*pad_x, height+2*pad_y, dest_x-pad_x, dest_y-pad_y);
  63
  64   screen_info.update_function();
  65
  66   BlitBitmap(screen_info.save_buffer, backbuffer, buf_x, buf_y,
  67             width+2*pad_x, height+2*pad_y, dest_x-pad_x, dest_y-pad_y);
  68 #else
  69   /* normal method, causing flickering interference with BackToFront() */
  70   BlitBitmap(backbuffer, screen_info.save_buffer, dest_x-pad_x, dest_y-pad_y,
  71              width+2*pad_x, height+2*pad_y, buf_x, buf_y);
  72   SetClipOrigin(toon_bitmap,toon_clip_gc, buf_x-src_x+pad_x,buf_y-src_y+pad_y);
  73   BlitBitmapMasked(toon_bitmap, screen_info.save_buffer,
  74                    src_x, src_y, width, height, buf_x+pad_x, buf_y+pad_y);
  75   BlitBitmap(screen_info.save_buffer, window, buf_x, buf_y,
  76              width+2*pad_x, height+2*pad_y, dest_x-pad_x, dest_y-pad_y);
  77 #endif
  78
  79   FlushDisplay();
  80 }
  81
  82 boolean AnimateToon(int toon_nr, boolean restart)
  83 {
  84   static int pos_x = 0, pos_y = 0;
  85   static int delta_x = 0, delta_y = 0;
  86   static int frame = 0, frame_step = 1;
  87   static boolean horiz_move, vert_move;
  88   static unsigned long anim_delay = 0;
  89   static unsigned long anim_delay_value = 0;
  90   static int width,height;
  91   static int pad_x,pad_y;
  92   static int cut_x,cut_y;
  93   static int src_x, src_y;
  94   static int dest_x, dest_y;
  95
  96   struct ToonInfo *anim = &screen_info.toons[toon_nr];
  97   int bitmap_nr = screen_info.toons[toon_nr].bitmap_nr;
  98   Bitmap *anim_bitmap = screen_info.toon_bitmap_array[bitmap_nr];
  99   GC anim_clip_gc = anim_bitmap->stored_clip_gc;
 100
 101   if (restart)
 102   {
 103     horiz_move = (anim->direction & (ANIMDIR_LEFT | ANIMDIR_RIGHT));
 104     vert_move = (anim->direction & (ANIMDIR_UP | ANIMDIR_DOWN));
 105     anim_delay_value = 1000/anim->frames_per_second;
 106     frame = 0;
 107
 108     if (horiz_move)
 109     {
 110       if (anim->position == ANIMPOS_UP)
 111         pos_y = 0;
 112       else if (anim->position == ANIMPOS_DOWN)
 113         pos_y = screen_info.height - anim->height;
 114       else if (anim->position == ANIMPOS_UPPER)
 115         pos_y = SimpleRND((screen_info.height - anim->height) / 2);
 116       else
 117         pos_y = SimpleRND(screen_info.height - anim->height);
 118
 119       if (anim->direction == ANIMDIR_RIGHT)
 120       {
 121         delta_x = anim->stepsize;
 122         pos_x = -anim->width + delta_x;
 123       }
 124       else
 125       {
 126         delta_x = -anim->stepsize;
 127         pos_x = screen_info.width + delta_x;
 128       }
 129       delta_y = 0;
 130     }
 131     else
 132     {
 133       if (anim->position == ANIMPOS_LEFT)
 134         pos_x = 0;
 135       else if (anim->position == ANIMPOS_RIGHT)
 136         pos_x = screen_info.width - anim->width;
 137       else
 138         pos_x = SimpleRND(screen_info.width - anim->width);
 139
 140       if (anim->direction == ANIMDIR_DOWN)
 141       {
 142         delta_y = anim->stepsize;
 143         pos_y = -anim->height + delta_y;
 144       }
 145       else
 146       {
 147         delta_y = -anim->stepsize;
 148         pos_y = screen_info.width + delta_y;
 149       }
 150       delta_x = 0;
 151     }
 152   }
 153
 154   if (pos_x <= -anim->width        - anim->stepsize ||
 155       pos_x >=  screen_info.width  + anim->stepsize ||
 156       pos_y <= -anim->height       - anim->stepsize ||
 157       pos_y >=  screen_info.height + anim->stepsize)
 158     return TRUE;
 159
 160   if (!DelayReached(&anim_delay, anim_delay_value))
 161   {
 162     if (screen_info.redraw_needed_function() && !restart)
 163       DrawAnim(anim_bitmap, anim_clip_gc,
 164                src_x + cut_x, src_y + cut_y,
 165                width, height,
 166                screen_info.startx + dest_x,
 167                screen_info.starty + dest_y,
 168                pad_x, pad_y);
 169
 170     return FALSE;
 171   }
 172
 173   if (pos_x < -anim->width)
 174     pos_x = -anim->width;
 175   else if (pos_x > screen_info.width)
 176     pos_x = screen_info.width;
 177   if (pos_y < -anim->height)
 178     pos_y = -anim->height;
 179   else if (pos_y > screen_info.height)
 180     pos_y = screen_info.height;
 181
 182   pad_x = (horiz_move ? anim->stepsize : 0);
 183   pad_y = (vert_move  ? anim->stepsize : 0);
 184   src_x = anim->src_x + frame * anim->width;
 185   src_y = anim->src_y;
 186   dest_x = pos_x;
 187   dest_y = pos_y;
 188   cut_x = cut_y = 0;
 189   width  = anim->width;
 190   height = anim->height;
 191
 192   if (pos_x<0)
 193   {
 194     dest_x = 0;
 195     width += pos_x;
 196     cut_x = -pos_x;
 197   }
 198   else if (pos_x > screen_info.width - anim->width)
 199     width -= (pos_x - (screen_info.width - anim->width));
 200
 201   if (pos_y<0)
 202   {
 203     dest_y = 0;
 204     height += pos_y;
 205     cut_y = -pos_y;
 206   }
 207   else if (pos_y > screen_info.height - anim->height)
 208     height -= (pos_y - (screen_info.height - anim->height));
 209
 210   DrawAnim(anim_bitmap, anim_clip_gc,
 211            src_x + cut_x, src_y + cut_y,
 212            width, height,
 213            screen_info.startx + dest_x,
 214            screen_info.starty + dest_y,
 215            pad_x, pad_y);
 216
 217   pos_x += delta_x;
 218   pos_y += delta_y;
 219   frame += frame_step;
 220
 221   if (frame<0 || frame>=anim->frames)
 222   {
 223     if (anim->pingpong)
 224     {
 225       frame_step *= -1;
 226       frame = (frame<0 ? 1 : anim->frames-2);
 227     }
 228     else
 229       frame = (frame<0 ? anim->frames-1 : 0);
 230   }
 231
 232   return FALSE;
 233 }
 234
 235 void HandleAnimation(int mode)
 236 {
 237   static unsigned long animstart_delay = -1;
 238   static unsigned long animstart_delay_value = 0;
 239   static boolean anim_restart = TRUE;
 240   static boolean reset_delay = TRUE;
 241   static int toon_nr = 0;
 242   int draw_mode;
 243
 244   if (!setup.toons)
 245     return;
 246
 247   switch(mode)
 248   {
 249     case ANIM_START:
 250       screen_info.prepare_backbuffer_function();
 251       anim_restart = TRUE;
 252       reset_delay = TRUE;
 253
 254       return;
 255
 256     case ANIM_CONTINUE:
 257       break;
 258
 259     case ANIM_STOP:
 260       redraw_mask |= (REDRAW_FIELD | REDRAW_FROM_BACKBUFFER);
 261
 262       /* Redraw background even when in direct drawing mode */
 263       draw_mode = setup.direct_draw;
 264       setup.direct_draw = FALSE;
 265       screen_info.update_function();
 266       setup.direct_draw = draw_mode;
 267
 268       return;
 269
 270     default:
 271       break;
 272   }
 273
 274   if (reset_delay)
 275   {
 276     animstart_delay = Counter();
 277     animstart_delay_value = SimpleRND(3000);
 278     reset_delay = FALSE;
 279   }
 280
 281   if (anim_restart)
 282   {
 283     if (!DelayReached(&animstart_delay, animstart_delay_value))
 284       return;
 285
 286     toon_nr = SimpleRND(screen_info.num_toons);
 287   }
 288
 289   anim_restart = reset_delay = AnimateToon(toon_nr,anim_restart);
 290 }
 291
 292 void InitAnimation()
 293 {
 294   HandleAnimation(ANIM_START);
 295 }
 296
 297 void StopAnimation()
 298 {
 299   HandleAnimation(ANIM_STOP);
 300 }
 301
 302 void DoAnimation()
 303 {
 304   HandleAnimation(ANIM_CONTINUE);
 305 }