graphics.c

   1
   2 /**
   3  *
   4  * Tennix! SDL Port
   5  * Copyright (C) 2003, 2007, 2008, 2009 Thomas Perl <thp@thpinfo.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version 2
  10  * of the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  20  * MA  02110-1301, USA.
  21  *
  22  **/
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <math.h>
  27 #include <unistd.h>
  28 #include <assert.h>
  29 #include <ctype.h>
  30 #include <string.h>
  31 #include <assert.h>
  32
  33 #include "tennix.h"
  34 #include "graphics.h"
  35 #include "archive.h"
  36 #include "sound.h"
  37
  38 #include "SDL_rotozoom.h"
  39
  40 static Image* images;
  41
  42 static Font* fonts;
  43 FreeList* font_freelist = NULL;
  44
  45 static FontDescription font_desc[] = {
  46     /**
  47      * This is the list of fonts to be loaded. Be sure to
  48      * use NULL as filename when using the same .ttf file
  49      * the second time in a row - this saves memory in the
  50      * loader function.
  51      **/
  52     { "dustismo.ttf", 15, TTF_STYLE_NORMAL },
  53     { NULL, 20, TTF_STYLE_NORMAL },
  54     { "itwasntme.ttf", 22, TTF_STYLE_NORMAL },
  55     { NULL, 28, TTF_STYLE_NORMAL }
  56 };
  57
  58 static SDL_Surface *buffer;
  59 static SDL_Surface *background;
  60
  61 static SDL_Rect *rect_update_cache;
  62 static SDL_Rect *rect_update_old;
  63 static int rect_update_cache_current;
  64 static int rect_update_old_count;
  65
  66 Uint32 fading_start = 0;
  67
  68 static const char* graphics[] = {
  69     "court.png",
  70     "shadow.png",
  71     "player-racket.png",
  72     "ball.png",
  73     "referee.png",
  74     "ctt_hard.png",
  75     "ctt_clay.png",
  76     "ctt_grass.png",
  77     "sidebar.png",
  78     "tennixlogo.png",
  79     "btnplay.png",
  80     "btnresume.png",
  81     "btnquit.png",
  82     "stadium.png",
  83     "fog.png",
  84     "fog2.png",
  85     "night.png",
  86     "talk.png",
  87     "cursor.png",
  88     "worldmap.png",
  89     "input_gamepad.png",
  90     "input_keyboard_arrows.png",
  91     "input_keyboard_ol.png",
  92     "input_keyboard_ws.png",
  93     "input_maemo_dpad.png",
  94     "input_mouse.png",
  95     "input_touchscreen.png",
  96     "input_ai.png",
  97     "back.png",
  98     "forward.png",
  99     "loc_margaret_court_arena.png",
 100     "loc_stade_roland_garros.png",
 101     "loc_court_no_1.png",
 102     "loc_arthur_ashe_stadium.png",
 103 #ifdef NONFREE_LOCATIONS
 104     "loc_training_camp.png",
 105     "loc_austrian_open.png",
 106     "loc_olympic_green_tennis.png"
 107 #endif
 108 };
 109
 110 void init_graphics() {
 111     int i;
 112     char *d;
 113     SDL_Surface* data;
 114     SDL_Surface* tmp;
 115     TennixArchive *tnxar;
 116     struct SDL_RWops* rw;
 117     char *font_data = NULL;
 118
 119     if (TTF_Init() == -1) {
 120         fprintf(stderr, "Cannot init TTF: %s\n", TTF_GetError());
 121         exit(EXIT_FAILURE);
 122     }
 123
 124     rect_update_cache = (SDL_Rect*)calloc(RECT_UPDATE_CACHE, sizeof(SDL_Rect));
 125     rect_update_old = (SDL_Rect*)calloc(RECT_UPDATE_CACHE, sizeof(SDL_Rect));
 126     rect_update_cache_current = 0;
 127     rect_update_old_count = 0;
 128
 129     images = (Image*)calloc( GR_COUNT, sizeof( Image));
 130     fonts = (Font*)calloc(FONT_COUNT, sizeof(Font));
 131
 132     buffer = SDL_CreateRGBSurface(SDL_SWSURFACE, WIDTH, HEIGHT,
 133                  screen->format->BitsPerPixel,
 134                  screen->format->Rmask,
 135                  screen->format->Gmask,
 136                  screen->format->Bmask,
 137                  screen->format->Amask);
 138
 139     background = SDL_CreateRGBSurface(SDL_SWSURFACE, WIDTH, HEIGHT,
 140                      screen->format->BitsPerPixel,
 141                      screen->format->Rmask,
 142                      screen->format->Gmask,
 143                      screen->format->Bmask,
 144                      screen->format->Amask);
 145
 146     if( buffer == NULL) {
 147         fprintf( stderr, "Cannot create buffer surface: %s\n", SDL_GetError());
 148     }
 149
 150     tnxar = tnxar_open(ARCHIVE_FILE);
 151     if (tnxar == NULL) {
 152         /* not found in cwd - try installed... */
 153         tnxar = tnxar_open(ARCHIVE_FILE_INSTALLED);
 154         assert(tnxar != NULL);
 155     }
 156
 157     font_freelist = freelist_create();
 158
 159     /* Load fonts from resource file */
 160     for (i=0; i<FONT_COUNT; i++) {
 161         if (font_desc[i].filename != NULL) {
 162             assert(tnxar_set_current_filename(tnxar, font_desc[i].filename) != 0);
 163             font_data = tnxar_read_current(tnxar);
 164             freelist_append(font_freelist, font_data);
 165         }
 166         assert(font_data != NULL);
 167         rw = SDL_RWFromMem(font_data, tnxar_size_current(tnxar));
 168         fonts[i].data = TTF_OpenFontRW(rw, 1, font_desc[i].size);
 169         assert(fonts[i].data != NULL);
 170         TTF_SetFontStyle(fonts[i].data, font_desc[i].style);
 171     }
 172
 173     draw_button(40, (HEIGHT-40)/2, WIDTH-80, 40, 100, 100, 100, 1);
 174     store_screen();
 175     updatescr();
 176
 177     for( i=0; i<GR_COUNT; i++) {
 178         if (tnxar_set_current_filename(tnxar, graphics[i]) != 0) {
 179             d = tnxar_read_current(tnxar);
 180             tmp = IMG_Load_RW(SDL_RWFromMem(d, tnxar_size_current(tnxar)), 1);
 181             free(d);
 182         } else {
 183             fprintf(stderr, "Cannot find file: %s\n", graphics[i]);
 184             exit(EXIT_FAILURE);
 185         }
 186         if( !tmp) {
 187             fprintf( stderr, "Error: %s\n", SDL_GetError());
 188             continue;
 189         }
 190
 191         /* Convert to RGBA in the display format */
 192         data = SDL_DisplayFormatAlpha(tmp);
 193         SDL_FreeSurface(tmp);
 194
 195         if( !data) {
 196             fprintf( stderr, "Error: %s\n", SDL_GetError());
 197             continue;
 198         }
 199         images[i].data = data;
 200
 201         draw_button(40, (HEIGHT-40)/2, (WIDTH-80)*i/(GR_COUNT+SOUND_MAX), 40, 100, 250, 100, 0);
 202         rectangle(40+BUTTON_BORDER*2, (HEIGHT-40)/2+20+BUTTON_BORDER, (WIDTH-80)*i/(GR_COUNT+SOUND_MAX)-BUTTON_BORDER*2, 10, 170, 250, 170);
 203         updatescr();
 204     }
 205     tnxar_close(tnxar);
 206 }
 207
 208 void uninit_graphics() {
 209     int i;
 210
 211     for( i=0; i<GR_COUNT; i++) {
 212         SDL_FreeSurface( images[i].data);
 213     }
 214
 215     if( buffer != NULL) {
 216         SDL_FreeSurface( buffer);
 217     }
 218
 219     if (background != NULL) {
 220         SDL_FreeSurface(background);
 221     }
 222
 223     free(rect_update_cache);
 224     free(rect_update_old);
 225     free(images);
 226
 227     for (i=0; i<FONT_COUNT; i++) {
 228         TTF_CloseFont(fonts[i].data);
 229         fonts[i].data = NULL;
 230     }
 231     free(fonts);
 232
 233     freelist_free_all(font_freelist);
 234
 235     TTF_Quit();
 236 }
 237
 238
 239 FreeList* freelist_create()
 240 {
 241     FreeList* list = (FreeList*)malloc(sizeof(FreeList));
 242     assert(list != NULL);
 243
 244     list->head = NULL;
 245
 246     return list;
 247 }
 248
 249 void freelist_append(FreeList* list, char* data)
 250 {
 251     FreeListItem* new_item = (FreeListItem*)malloc(sizeof(FreeListItem));
 252
 253     assert(list != NULL);
 254     assert(data != NULL);
 255
 256     new_item->data = data;
 257
 258     /* Insert item at the beginning of list */
 259     new_item->next = list->head;
 260     list->head = new_item;
 261 }
 262
 263 void freelist_free_all(FreeList* list)
 264 {
 265     FreeListItem* next;
 266
 267     assert(list != NULL);
 268
 269     while (list->head != NULL) {
 270         /* Remove one item from the head of the list */
 271         next = list->head->next;
 272         free(list->head->data);
 273         free(list->head);
 274         list->head = next;
 275     }
 276
 277     free(list);
 278 }
 279
 280
 281 int get_image_width( image_id id) {
 282     return images[id].data->w;
 283 }
 284
 285 int get_image_height( image_id id) {
 286     return images[id].data->h;
 287 }
 288
 289 int get_sprite_width( image_id id, int items) {
 290     return images[id].data->w / items;
 291 }
 292
 293 void show_sprite( image_id id, int pos, int items, int x_offset,
 294         int y_offset, int opacity)
 295 {
 296     assert(id < GR_COUNT);
 297     SDL_SetAlpha(images[id].data, SDL_SRCALPHA | SDL_RLEACCEL, opacity);
 298     blit_surface(images[id].data, x_offset, y_offset, pos, items);
 299 }
 300
 301 void show_image_rotozoom(image_id id, int x, int y, float rotate, float zoom)
 302 {
 303     SDL_Surface* tmp;
 304     SDL_Rect src, dst;
 305
 306     assert(id < GR_COUNT);
 307
 308     tmp = rotozoomSurface(images[id].data, rotate, zoom, SMOOTHING_OFF);
 309
 310     dst.w = src.w = tmp->w;
 311     dst.h = src.h = tmp->h;
 312     src.x = 0;
 313     src.y = 0;
 314     dst.x = x - src.w/2;
 315     dst.y = y - src.h/2;
 316
 317     SDL_BlitSurface(tmp, &src, screen, &dst);
 318     update_rect2(dst);
 319     SDL_FreeSurface(tmp);
 320 }
 321
 322 void fill_image_offset( image_id id, int x, int y, int w, int h, int offset_x, int offset_y) {
 323     SDL_Surface *bitmap;
 324     SDL_Rect src, dst;
 325     int dx = 0, dy = 0, cx, cy;
 326
 327     if( id >= GR_COUNT) return;
 328
 329     bitmap = images[id].data;
 330
 331     /* Make negative offsets positive */
 332     if (offset_x < 0) {
 333         offset_x = (offset_x%bitmap->w)+bitmap->w;
 334     }
 335     if (offset_y < 0) {
 336         offset_y = (offset_y%bitmap->h)+bitmap->h;
 337     }
 338
 339     src.y = offset_y % bitmap->h;
 340     while( dy < h) {
 341         src.h = dst.h = cy = (h-dy > bitmap->h-src.y)?(bitmap->h-src.y):(h-dy);
 342         dst.y = y+dy;
 343
 344         dx = 0;
 345         src.x = offset_x % bitmap->w;
 346         while( dx < w) {
 347             src.w = dst.w = cx = (w-dx > bitmap->w-src.x)?(bitmap->w-src.x):(w-dx);
 348             dst.x = x+dx;
 349
 350             SDL_BlitSurface( bitmap, &src, screen, &dst);
 351             update_rect2(dst);
 352
 353             dx += cx;
 354             src.x = 0;
 355         }
 356
 357         dy += cy;
 358         src.y = 0;
 359     }
 360 }
 361
 362 void line_horiz( int y, Uint8 r, Uint8 g, Uint8 b) {
 363     rectangle(0, y, screen->w, 1, r, g, b);
 364 }
 365
 366 void line_vert( int x, Uint8 r, Uint8 g, Uint8 b) {
 367     rectangle(x, 0, 1, screen->h, r, g, b);
 368 }
 369
 370 void rectangle( int x, int y, int w, int h, Uint8 r, Uint8 g, Uint8 b) {
 371     Uint32 color;
 372     SDL_Rect rect;
 373
 374     if (w <= 0 || h <= 0 || x < 0 || y < 0 || x+w > WIDTH || y+h > HEIGHT) {
 375         return;
 376     }
 377
 378     color = SDL_MapRGB(screen->format, r, g, b);
 379
 380     rect.x = x;
 381     rect.y = y;
 382     rect.w = w;
 383     rect.h = h;
 384
 385     SDL_FillRect( screen, &rect, color);
 386     update_rect(x, y, w, h);
 387 }
 388
 389 void rectangle_alpha(int x, int y, int w, int h, Uint8 r, Uint8 g, Uint8 b, Uint8 opacity)
 390 {
 391     Uint32 color;
 392     SDL_Surface *buf;
 393     SDL_Rect rect, rect2;
 394
 395     if (w <= 0 || h <= 0 || x < 0 || y < 0 || x+w > WIDTH || y+h > HEIGHT) {
 396         return;
 397     }
 398
 399     color = SDL_MapRGB(screen->format, r, g, b);
 400
 401     buf = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h,
 402                  screen->format->BitsPerPixel,
 403                  screen->format->Rmask,
 404                  screen->format->Gmask,
 405                  screen->format->Bmask,
 406                  screen->format->Amask);
 407
 408     rect.x = rect.y = 0;
 409     rect2.x = x;
 410     rect2.y = y;
 411     rect.w = rect2.w = w;
 412     rect.h = rect2.h = h;
 413
 414     SDL_FillRect(buf, &rect, color);
 415     SDL_SetAlpha(buf, SDL_RLEACCEL | SDL_SRCALPHA, opacity);
 416     SDL_BlitSurface(buf, &rect, screen, &rect2);
 417     update_rect(x, y, w, h);
 418
 419     SDL_FreeSurface(buf);
 420 }
 421
 422 void draw_button( int x, int y, int w, int h, Uint8 r, Uint8 g, Uint8 b, char pressed) {
 423     float diff = (pressed?1.0-BUTTON_HIGHLIGHT:1.0+BUTTON_HIGHLIGHT);
 424     rectangle(x, y, w, h, MIN(r*diff, 255), MIN(g*diff, 255), MIN(b*diff, 255));
 425     rectangle(x+BUTTON_BORDER, y+BUTTON_BORDER, w-BUTTON_BORDER, h-BUTTON_BORDER, MIN(r/diff, 255), MIN(g/diff, 255), MIN(b/diff, 255));
 426     rectangle(x+BUTTON_BORDER, y+BUTTON_BORDER, w-2*BUTTON_BORDER, h-2*BUTTON_BORDER, r, g, b);
 427 }
 428
 429 void draw_button_text(const char* s, int x, int y, int w, int h, Uint8 r, Uint8 g, Uint8 b, char pressed) {
 430     int font_x, font_y;
 431     float factor = 0.3;
 432     pressed = pressed?1:0;
 433     draw_button( x, y, w, h, r, g, b, pressed);
 434     font_x = x + w/2 - font_get_string_width(FONT_SMALL, s)/2 + pressed*BUTTON_BORDER;
 435     font_y = y + h/2 - font_get_height(FONT_SMALL)/2 + pressed*BUTTON_BORDER;
 436     font_draw_string_color(FONT_SMALL, s, font_x, font_y, (Uint8)(r*factor), (Uint8)(g*factor), (Uint8)(b*factor));
 437 }
 438
 439 void draw_button_object(MenuButton* b, int mx, int my)
 440 {
 441     if (b->image_id == GR_COUNT) {
 442         draw_button_text(b->text, b->x, b->y, b->w, b->h, b->r, b->g, b->b, M_POS_BUTTON(*b, mx, my));
 443     } else {
 444         show_image_rotozoom(b->image_id, b->x+b->w/2, b->y+b->h/2, 0.0, 1.0+0.2*M_POS_BUTTON(*b, mx, my));
 445     }
 446 }
 447
 448 void clear_screen()
 449 {
 450     SDL_Rect rect;
 451
 452     rect.x = rect.y = 0;
 453     rect.w = WIDTH;
 454     rect.h = HEIGHT;
 455
 456     SDL_FillRect(screen, &rect, SDL_MapRGB(screen->format, 0, 0, 0));
 457 }
 458
 459 void store_screen()
 460 {
 461     SDL_BlitSurface(screen, NULL, background, NULL);
 462     rect_update_old[0].x = rect_update_old[0].y = 0;
 463     rect_update_old[0].w = WIDTH;
 464     rect_update_old[0].h = HEIGHT;
 465     rect_update_old_count = 1;
 466     rect_update_cache_current = 0;
 467 }
 468
 469 void reset_screen()
 470 {
 471     int i;
 472     SDL_Rect* tmp;
 473     SDL_BlitSurface(background, NULL, screen, NULL);
 474
 475     for (i=0; i<rect_update_cache_current; i++) {
 476         SDL_BlitSurface(background, &rect_update_cache[i], screen, &rect_update_cache[i]);
 477     }
 478
 479     /* Save rects I've just updated for redraw later */
 480     tmp = rect_update_cache;
 481     rect_update_cache = rect_update_old;
 482     rect_update_old = tmp;
 483     rect_update_old_count = rect_update_cache_current;
 484     rect_update_cache_current = 0;
 485 }
 486
 487 void update_rect(Sint32 x, Sint32 y, Sint32 w, Sint32 h)
 488 {
 489     SDL_Rect* u = NULL;
 490     static int inside = 0;
 491     if (inside) return;
 492     inside = 1;
 493
 494 #ifdef DRAW_UPDATE_RECTANGLE
 495     rectangle(x, y, w, h, 50+rand()%200, 50+rand()%200 ,50+rand()%200);
 496 #endif
 497
 498     if ((x >= WIDTH) | (y >= HEIGHT) | (x+w <= 0) | (y+h <= 0) | (!w) | (!h)) {
 499         inside = 0;
 500         return;
 501     }
 502
 503     if (rect_update_cache_current == RECT_UPDATE_CACHE) {
 504         fprintf(stderr, "Overflow\n");
 505         rect_update_cache_current = 0;
 506     }
 507
 508     u = &(rect_update_cache[rect_update_cache_current]);
 509
 510     if (x < 0/* && x+w > 0*/) {
 511         w += x;
 512         x = 0;
 513     }
 514     if (y < 0/* && y+h > 0*/) {
 515         h += y;
 516         y = 0;
 517     }
 518
 519     if (x+w >= WIDTH) {
 520         w -= (x+w-WIDTH+1);
 521     }
 522
 523     if (y+h >= HEIGHT) {
 524         h -= (y+h-HEIGHT+1);
 525     }
 526
 527     if (w==0 || h==0) {
 528         inside = 0;
 529         return;
 530     }
 531
 532     u->x = x;
 533     u->y = y;
 534     u->w = w;
 535     u->h = h;
 536
 537     rect_update_cache_current++;
 538
 539     inside = 0;
 540 }
 541
 542 void updatescr()
 543 {
 544     Uint32 ticks = SDL_GetTicks();
 545     SDL_Rect *r_current = NULL, *end_current = NULL;
 546     SDL_Rect *r_old = NULL;
 547
 548     static int fading_last_time = 0;
 549     unsigned char fading_now = ticks < fading_start+FADE_DURATION;
 550
 551     if (fading_now) {
 552         SDL_SetAlpha(buffer, SDL_SRCALPHA | SDL_RLEACCEL, 255-255*(ticks-fading_start)/FADE_DURATION);
 553         SDL_BlitSurface(buffer, NULL, screen, NULL);
 554         SDL_UpdateRect(screen, 0, 0, 0, 0);
 555     } else if (fading_last_time && !fading_now) {
 556         SDL_UpdateRect(screen, 0, 0, 0, 0);
 557     } else {
 558         if (rect_update_old_count == rect_update_cache_current) {
 559             /* Merge rects into one single rect list */
 560             r_old = rect_update_old;
 561             r_current = rect_update_cache;
 562             end_current = rect_update_cache + rect_update_cache_current;
 563             while (r_current != end_current) {
 564                 r_old->w = MAX(r_current->x+r_current->w, r_old->x+r_old->w);
 565                 r_old->h = MAX(r_current->y+r_current->h, r_old->y+r_old->h);
 566                 r_old->x = MIN(r_current->x, r_old->x);
 567                 r_old->y = MIN(r_current->y, r_old->y);
 568                 r_old->w -= r_old->x;
 569                 r_old->h -= r_old->y;
 570
 571                 r_current++;
 572                 r_old++;
 573             }
 574             SDL_UpdateRects(screen, rect_update_old_count, rect_update_old);
 575         } else {
 576             SDL_UpdateRects(screen, rect_update_old_count, rect_update_old);
 577             SDL_UpdateRects(screen, rect_update_cache_current, rect_update_cache);
 578         }
 579     }
 580
 581     reset_screen();
 582     fading_last_time = fading_now;
 583 }
 584
 585 void start_fade() {
 586     SDL_BlitSurface( screen, NULL, buffer, NULL);
 587     fading_start = SDL_GetTicks();
 588 }
 589
 590 SDL_Surface* font_render_surface(font_id id, const char* text, Uint8 r,
 591         Uint8 g, Uint8 b)
 592 {
 593     SDL_Surface *result;
 594     SDL_Color color;
 595
 596     color.r = r;
 597     color.g = g;
 598     color.b = b;
 599
 600     assert(id < FONT_COUNT);
 601
 602     result = TTF_RenderText_Blended(fonts[id].data, text, color);
 603
 604     assert(result != NULL);
 605
 606     return result;
 607 }
 608
 609 void blit_surface(SDL_Surface* surface, int x, int y, int pos, int count)
 610 {
 611     SDL_Rect src, dst;
 612
 613     dst.w = src.w = surface->w/count;
 614     dst.h = src.h = surface->h;
 615     src.x = src.w*pos;
 616     src.y = 0;
 617     dst.x = x;
 618     dst.y = y;
 619
 620     SDL_BlitSurface(surface, &src, screen, &dst);
 621     update_rect2(dst);
 622 }
 623
 624 SDL_Surface* get_surface(image_id id)
 625 {
 626     assert(id < GR_COUNT);
 627     return images[id].data;
 628 }
 629
 630 void font_draw_string_color(font_id id, const char* s, int x_offset, int y_offset, Uint8 r, Uint8 g, Uint8 b) {
 631     SDL_Surface *text;
 632
 633     text = font_render_surface(id, s, r, g, b);
 634     blit_surface_simple(text, x_offset, y_offset);
 635     SDL_FreeSurface(text);
 636 }
 637
 638 int font_get_string_width(font_id id, const char* s) {
 639     int w, h;
 640
 641     assert(id < FONT_COUNT);
 642
 643     if (TTF_SizeText(fonts[id].data, s, &w, &h) != 0) {
 644         return 0;
 645     }
 646
 647     return w;
 648 }
 649
 650 int font_get_height(font_id id) {
 651     assert(id < FONT_COUNT);
 652     return TTF_FontHeight(fonts[id].data);
 653 }
 654
 655 void draw_line_faded( int x1, int y1, int x2, int y2, int r, int g, int b, int r2, int g2, int b2) {
 656     float step, dx, dy, x = x1, y = y1;
 657     int i;
 658     char fade = (r!=r2 || g!=g2 || b!=b2);
 659
 660     step = (float)(abs(x2-x1)>abs(y2-y1)?abs(x2-x1):abs(y2-y1));
 661     dx = (float)(x2-x1) / step;
 662     dy = (float)(y2-y1) / step;
 663
 664     SDL_LockSurface( screen);
 665     for( i=0; i<step; i++) {
 666         x += dx;
 667         y += dy;
 668         if( x < 0.0 || x >= WIDTH || y < 0.0 || y >= HEIGHT) {
 669             continue;
 670         }
 671         if( fade) {
 672             SET_PIXEL_RGB( screen, (int)x, (int)y, (r*(step-i)+r2*i)/step, (g*(step-i)+g2*i)/step, (b*(step-i)+b2*i)/step);
 673         } else {
 674             SET_PIXEL_RGB( screen, (int)x, (int)y, r, g, b);
 675         }
 676     }
 677     SDL_UnlockSurface( screen);
 678 }
 679