src/graphics.cc

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