git.sesse.net Git - vlc/blob - plugins/macosx/vout_macosx.c

   1 /*****************************************************************************
   2  * vout_macosx.c: MacOS X video output plugin
   3  *****************************************************************************
   4  * Copyright (C) 2001 VideoLAN
   5  *
   6  * Authors:
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  21  *****************************************************************************/
  22
  23 #define MODULE_NAME macosx
  24 #include "modules_inner.h"
  25
  26 /*****************************************************************************
  27  * Preamble
  28  *****************************************************************************/
  29 #include "defs.h"
  30
  31 #include <errno.h>                                                 /* ENOMEM */
  32 #include <stdlib.h>                                                /* free() */
  33 #include <string.h>                                            /* strerror() */
  34
  35 #include "config.h"
  36 #include "common.h"
  37 #include "threads.h"
  38 #include "mtime.h"
  39 #include "tests.h"
  40
  41 #include "video.h"
  42 #include "video_output.h"
  43
  44 #include "intf_msg.h"
  45
  46 #include "main.h"
  47
  48 #include "modules.h"
  49
  50 #ifndef __CARBONPREFIX__
  51     #define __CARBONPREFIX__
  52
  53     // Needed for carbonization
  54     #define TARGET_API_MAC_CARBON 1
  55
  56     // For the pascal to C or C to pascal string conversions in carbon
  57     #define OLDP2C 1
  58 #endif
  59
  60 #include <Carbon/Carbon.h>
  61
  62 // Initial Window Constants
  63 enum
  64 {
  65     kWindowOffset = 100
  66 };
  67
  68 // where is the off screen
  69 enum
  70 {
  71     kNoWhere = 0,
  72     kInVRAM,
  73     kInAGP,
  74     kInSystem
  75 };
  76
  77 /*****************************************************************************
  78  * vout_sys_t: MacOS X video output method descriptor
  79  *****************************************************************************
  80  * This structure is part of the video output thread descriptor.
  81  * It describes the MacOS X specific properties of an output thread.
  82  *****************************************************************************/
  83 typedef struct vout_sys_s
  84 {
  85     /* MacOS X video memory */
  86     byte_t *                    p_video;                      /* base adress */
  87     size_t                      i_page_size;                    /* page size */
  88
  89     Rect        wrect;
  90     WindowRef   p_window;
  91     short gwLocOffscreen;
  92     GWorldPtr p_gw[ 2 ];
  93     Boolean gNewNewGWorld;      /* can we allocate in VRAm or AGP memory ? */
  94
  95     // Boolean gDone;
  96     // SInt32 gSleepTime;
  97
  98     GDHandle  theGDList;
  99     Ptr                         theBase;
 100     int                         theRow;
 101     int                         theDepth;
 102 } vout_sys_t;
 103
 104 /*****************************************************************************
 105  * Local prototypes
 106  *****************************************************************************/
 107 static int  vout_Probe     ( probedata_t *p_data );
 108 static int  vout_Create    ( struct vout_thread_s * );
 109 static int  vout_Init      ( struct vout_thread_s * );
 110 static void vout_End       ( struct vout_thread_s * );
 111 static void vout_Destroy   ( struct vout_thread_s * );
 112 static int  vout_Manage    ( struct vout_thread_s * );
 113 static void vout_Display   ( struct vout_thread_s * );
 114
 115 /* OS specific */
 116
 117 static int CreateDisplay        ( struct vout_thread_s * );
 118 static int MakeWindow           ( struct vout_thread_s * );
 119 static int AllocBuffer          ( struct vout_thread_s * , short index );
 120
 121 void BlitToWindow               ( struct vout_thread_s * , short index );
 122 GDHandle GetWindowDevice        ( struct vout_thread_s * );
 123 void FillOffscreen              ( struct vout_thread_s * , short index);
 124
 125 void FindBestMemoryLocation( struct vout_thread_s * );
 126
 127 /*****************************************************************************
 128  * Functions exported as capabilities. They are declared as static so that
 129  * we don't pollute the namespace too much.
 130  *****************************************************************************/
 131 void _M( vout_getfunctions )( function_list_t * p_function_list )
 132 {
 133     p_function_list->pf_probe = vout_Probe;
 134     p_function_list->functions.vout.pf_create     = vout_Create;
 135     p_function_list->functions.vout.pf_init       = vout_Init;
 136     p_function_list->functions.vout.pf_end        = vout_End;
 137     p_function_list->functions.vout.pf_destroy    = vout_Destroy;
 138     p_function_list->functions.vout.pf_manage     = vout_Manage;
 139     p_function_list->functions.vout.pf_display    = vout_Display;
 140     p_function_list->functions.vout.pf_setpalette = NULL;
 141 }
 142
 143 /*****************************************************************************
 144  * intf_Probe: return a score
 145  *****************************************************************************/
 146 static int vout_Probe( probedata_t *p_data )
 147 {
 148     if( TestMethod( VOUT_METHOD_VAR, "macosx" ) )
 149     {
 150         return( 999 );
 151     }
 152
 153     return( 100 );
 154 }
 155
 156 /*****************************************************************************
 157  * vout_Create: allocates MacOS X video thread output method
 158  *****************************************************************************
 159  * This function allocates and initializes a MacOS X vout method.
 160  *****************************************************************************/
 161 static int vout_Create( vout_thread_t *p_vout )
 162 {
 163     //intf_ErrMsg( "vout_Create()" );
 164
 165     /* Allocate structure */
 166     p_vout->p_sys = malloc( sizeof( vout_sys_t ) );
 167     if( p_vout->p_sys == NULL )
 168     {
 169         intf_ErrMsg( "error: %s", strerror( ENOMEM ) );
 170         return( 1 );
 171     }
 172
 173     p_vout->p_sys->gwLocOffscreen = kNoWhere;
 174     p_vout->p_sys->p_window       = NULL;
 175     p_vout->p_sys->p_gw[ 0 ]      = NULL;
 176     p_vout->p_sys->p_gw[ 1 ]      = NULL;
 177     p_vout->p_sys->i_page_size    = p_vout->i_width * p_vout->i_height
 178                                   * p_vout->i_bytes_per_pixel;
 179
 180     if ( CreateDisplay( p_vout ) )
 181     {
 182         intf_ErrMsg( "vout error: can't open display" );
 183         free( p_vout->p_sys );
 184         return( 1 );
 185     }
 186
 187 #if 0
 188     intf_ErrMsg( "vout p_vout->i_width %d" , p_vout->i_width);
 189     intf_ErrMsg( "vout p_vout->i_height %d" , p_vout->i_height);
 190     intf_ErrMsg( "vout p_vout->i_bytes_per_pixel %d" , p_vout->i_bytes_per_pixel);
 191     intf_ErrMsg( "vout p_vout->i_screen_depth %d" , p_vout->i_screen_depth);
 192     intf_ErrMsg( "vout p_vout->p_sys->i_page_size %d" , p_vout->p_sys->i_page_size);
 193 #endif
 194
 195 #if 0
 196     /* Map two framebuffers a the very beginning of the fb */
 197     p_vout->p_sys->p_video = malloc( 2 * p_vout->p_sys->i_page_size );
 198     if( p_vout->p_sys->p_video == NULL )
 199     {
 200         intf_ErrMsg( "vout error: can't map video memory (%s)",
 201                      strerror(errno) );
 202         free( p_vout->p_sys );
 203         return( 1 );
 204     }
 205     /* Set and initialize buffers */
 206     vout_SetBuffers( p_vout, p_vout->p_sys->p_video,
 207                     p_vout->p_sys->p_video + p_vout->p_sys->i_page_size );
 208 #endif
 209
 210     return( 0 );
 211 }
 212
 213 /*****************************************************************************
 214  * Find the best memory (AGP, VRAM, system) location
 215  *****************************************************************************/
 216 void FindBestMemoryLocation( vout_thread_t *p_vout )
 217 {
 218     long versionSystem;
 219
 220     Gestalt( gestaltSystemVersion, &versionSystem );
 221     if ( 0x00000900 <= ( versionSystem & 0x00000FF00  ) )
 222     {
 223         intf_ErrMsg( "FindBestMemoryLocation : gNewNewGWorld = true" );
 224         p_vout->p_sys->gNewNewGWorld = true;
 225     }
 226     else
 227     {
 228         // now it is tricky
 229         // we will try to allocate in VRAM and find out where the allocation really ended up.
 230         GWorldPtr pgwTest = NULL;
 231         Rect rectTest = {0, 0, 10, 10};
 232         short wPixDepth =
 233             (**(GetPortPixMap( GetWindowPort( p_vout->p_sys->p_window ) ))).pixelSize;
 234         GDHandle hgdWindow = GetWindowDevice( p_vout );
 235
 236         intf_ErrMsg( "FindBestMemoryLocation : gNewNewGWorld = false !" );
 237 #if 0
 238         p_vout->i_screen_depth = wPixDepth;
 239         p_vout->i_bytes_per_pixel = wPixDepth;
 240         p_vout->i_bytes_per_line   = p_vout->i_width * p_vout->i_bytes_per_pixel;
 241         p_vout->p_sys->i_page_size = p_vout->i_width * p_vout->i_height * p_vout->i_bytes_per_pixel;
 242 //p_vout->i_bytes_per_line = (**(**hgdWindow).gdPMap).rowBytes & 0x3FFF ;
 243 #endif
 244         if(    ( noErr == NewGWorld( &pgwTest, wPixDepth, &rectTest, NULL, hgdWindow,
 245                                      noNewDevice | useDistantHdwrMem ) )
 246             && ( pgwTest ) )
 247         {
 248             p_vout->p_sys->gNewNewGWorld = true;
 249         }
 250
 251         if( pgwTest )
 252         {
 253             DisposeGWorld( pgwTest );
 254         }
 255     }
 256 }
 257
 258 /*****************************************************************************
 259  * CreateDisplay: setup display params...
 260  *****************************************************************************/
 261 static int CreateDisplay( vout_thread_t *p_vout )
 262 {
 263     PixMapHandle hPixmap0, hPixmap1;
 264     void * hPixmapBaseAddr0, * hPixmapBaseAddr1;
 265
 266     //intf_ErrMsg( "CreateDisplay()" );
 267
 268     if( MakeWindow( p_vout ) )
 269     {
 270         intf_ErrMsg( "vout error: can't open window display" );
 271         return( 1 );
 272     }
 273
 274     // FindBestMemoryLocation( p_vout );
 275
 276     //try to allocate @ best location, will eventaully trickle down to worst
 277     p_vout->p_sys->gwLocOffscreen = kInVRAM;
 278     if( AllocBuffer( p_vout, 0 ) || AllocBuffer( p_vout, 1 ) )
 279     {
 280         intf_ErrMsg( "vout error: can't alloc offscreen buffers" );
 281         return( 1 );
 282     }
 283
 284 //FIXME ? - lock this down until the end...
 285     hPixmap0 = GetGWorldPixMap( p_vout->p_sys->p_gw[0] );
 286     LockPixels(hPixmap0);
 287     hPixmap1 = GetGWorldPixMap( p_vout->p_sys->p_gw[1] );
 288     LockPixels(hPixmap1);
 289
 290     //FIXME hopefully this is the same for all Gworlds & window since they are the same size
 291     p_vout->i_bytes_per_line = (**hPixmap0).rowBytes & 0x3FFF;
 292
 293     if ( (hPixmap0 == NULL) || (hPixmap1 == NULL) )
 294     {
 295         intf_ErrMsg( "vout error: pixmap problem");
 296         UnlockPixels(hPixmap0);
 297         UnlockPixels(hPixmap1);
 298         return( 1 );
 299     }
 300
 301     hPixmapBaseAddr0 = GetPixBaseAddr( hPixmap0 );
 302     hPixmapBaseAddr1 = GetPixBaseAddr( hPixmap1 );
 303     if ( (hPixmapBaseAddr0 == NULL) || (hPixmapBaseAddr1 == NULL) )
 304     {
 305         intf_ErrMsg( "vout error: pixmap base addr problem");
 306         return( 1 );
 307     }
 308
 309 //FIXME - if I ever dispose of the Gworlds and recreate them, i'll have a new address
 310 //and I'll need to tell vout about them...  dunno what problems vout might have if we just updateGworld
 311     vout_SetBuffers( p_vout, hPixmapBaseAddr0, hPixmapBaseAddr1 );
 312
 313     return 0;
 314 }
 315
 316 /*****************************************************************************
 317  * MakeWindow: open and set-up a Mac OS main window
 318  *****************************************************************************/
 319 static int MakeWindow( vout_thread_t *p_vout )
 320 {
 321     int left = 0;
 322     int top = 0;
 323     int bottom = p_vout->i_height;
 324     int right = p_vout->i_width;
 325
 326     WindowAttributes windowAttr = kWindowStandardDocumentAttributes |
 327                                     kWindowStandardHandlerAttribute |
 328                                     kWindowInWindowMenuAttribute;
 329
 330     SetRect( &p_vout->p_sys->wrect, left, top, right, bottom );
 331     OffsetRect( &p_vout->p_sys->wrect, kWindowOffset, kWindowOffset );
 332
 333     CreateNewWindow( kDocumentWindowClass, windowAttr, &p_vout->p_sys->wrect, &p_vout->p_sys->p_window );
 334     if ( p_vout->p_sys->p_window == nil )
 335     {
 336         return( 1 );
 337     }
 338
 339     InstallStandardEventHandler(GetWindowEventTarget(p_vout->p_sys->p_window));
 340     SetPort( GetWindowPort( p_vout->p_sys->p_window ) );
 341     SetWindowTitleWithCFString( p_vout->p_sys->p_window, CFSTR("VLC") );
 342 //    ShowWindow( p_vout->p_sys->p_window );
 343     TransitionWindow( p_vout->p_sys->p_window, kWindowZoomTransitionEffect, kWindowShowTransitionAction, NULL);
 344     BringToFront(  p_vout->p_sys->p_window );
 345
 346 {
 347     short wPixDepth = (**(GetPortPixMap( GetWindowPort( p_vout->p_sys->p_window ) ))).pixelSize;
 348     p_vout->i_screen_depth = wPixDepth;
 349     p_vout->i_bytes_per_pixel = p_vout->i_screen_depth / 8;
 350     p_vout->i_bytes_per_line   = p_vout->i_width * p_vout->i_bytes_per_pixel;
 351     p_vout->p_sys->i_page_size = p_vout->i_width * p_vout->i_height * p_vout->i_bytes_per_pixel;
 352
 353     p_vout->i_bytes_per_line = (**(**GetWindowDevice( p_vout )).gdPMap).rowBytes & 0x3FFF ;
 354
 355     switch ( p_vout->i_screen_depth )
 356     {
 357         case 32:
 358         case 24:
 359             p_vout->i_red_mask =   0xff0000;
 360             p_vout->i_green_mask = 0xff00;
 361             p_vout->i_blue_mask =  0xff;
 362             break;
 363         case 16:
 364         case 15:
 365             p_vout->i_red_mask =   0x00007c00;
 366             p_vout->i_green_mask = 0x000003e0;
 367             p_vout->i_blue_mask =  0x0000001f;
 368             break;
 369         default:
 370             break;
 371     }
 372
 373 #if 0
 374     p_vout->i_red_lshift = 0x10;
 375     p_vout->i_red_rshift = 0x0;
 376     p_vout->i_green_lshift = 0x8;
 377     p_vout->i_green_rshift = 0x0;
 378     p_vout->i_blue_lshift = 0x0;
 379     p_vout->i_blue_rshift = 0x0;
 380
 381     p_vout->i_white_pixel = 0xffffff;
 382     p_vout->i_black_pixel = 0x0;
 383     p_vout->i_gray_pixel = 0x808080;
 384     p_vout->i_blue_pixel = 0x32;
 385 #endif
 386 }
 387
 388     return( 0 );
 389 }
 390
 391 /*****************************************************************************
 392  * AllocBuffer: forces offscreen allocation (if different than current) in memory type specified
 393  *****************************************************************************/
 394 static int AllocBuffer ( vout_thread_t *p_vout, short index )
 395 {
 396     Rect bounds;
 397     GDHandle hgdWindow = GetWindowDevice( p_vout );
 398
 399     switch ( p_vout->p_sys->gwLocOffscreen )
 400     {
 401         case kInVRAM:
 402             if ( noErr == NewGWorld( &p_vout->p_sys->p_gw[index], p_vout->i_screen_depth,
 403                 GetPortBounds( GetWindowPort( p_vout->p_sys->p_window ), &bounds ), NULL,
 404                 hgdWindow, noNewDevice | useDistantHdwrMem ) )
 405             {
 406                 intf_ErrMsg( "Allocate off screen image in VRAM" );
 407                 break;
 408             }
 409             intf_ErrMsg( "Unable to allocate off screen image in VRAM, trying next best AGP" );
 410             p_vout->p_sys->gwLocOffscreen = kInAGP;
 411         case kInAGP:
 412             if (noErr == NewGWorld( &p_vout->p_sys->p_gw[index], p_vout->i_screen_depth,
 413                 GetPortBounds( GetWindowPort( p_vout->p_sys->p_window ), &bounds ), NULL,
 414                 hgdWindow, noNewDevice | useLocalHdwrMem ) )
 415             {
 416                 intf_ErrMsg( "Allocate off screen image in AGP" );
 417                 break;
 418             }
 419             intf_ErrMsg( "Unable to allocate off screen image in AGP, trying next best System" );
 420             p_vout->p_sys->gwLocOffscreen = kInSystem;
 421         case kInSystem:
 422         default:
 423             if ( noErr == NewGWorld( &p_vout->p_sys->p_gw[index], p_vout->i_screen_depth,
 424                 GetPortBounds( GetWindowPort( p_vout->p_sys->p_window ), &bounds ), NULL,
 425                 hgdWindow, noNewDevice | keepLocal) )
 426             {
 427                 intf_ErrMsg( "Allocate off screen image in System" );
 428                 break;
 429             }
 430             intf_ErrMsg( "Unable to allocate off screen image in System, no options left - failing" );
 431             p_vout->p_sys->gwLocOffscreen = kNoWhere;
 432             return( 1 ); // nothing was allocated
 433     }
 434     return( 0 );
 435 }
 436
 437 /*****************************************************************************
 438  * vout_Init: initialize video thread output method
 439  *****************************************************************************/
 440 static int vout_Init( vout_thread_t *p_vout )
 441 {
 442     //intf_ErrMsg( "vout_Init()" );
 443     return( 0 );
 444 }
 445
 446 /*****************************************************************************
 447  * vout_End: terminate video thread output method
 448  *****************************************************************************/
 449 static void vout_End( vout_thread_t *p_vout )
 450 {
 451     //intf_ErrMsg( "vout_End()" );
 452     ;
 453 }
 454
 455 /*****************************************************************************
 456  * vout_Destroy: destroy video thread output method
 457  *****************************************************************************/
 458 static void vout_Destroy( vout_thread_t *p_vout )
 459 {
 460     //intf_ErrMsg( "vout_Destroy()" );
 461
 462 //FIXME KLUDGE to lock pixels
 463 #if 1
 464 {
 465     PixMapHandle hPixmap0, hPixmap1;
 466     hPixmap0 = GetGWorldPixMap( p_vout->p_sys->p_gw[0] );
 467     hPixmap1 = GetGWorldPixMap( p_vout->p_sys->p_gw[1] );
 468     UnlockPixels(hPixmap0);
 469     UnlockPixels(hPixmap1);
 470 }
 471 #endif
 472
 473 #if 1
 474     if ( p_vout->p_sys->p_gw[0] )
 475     {
 476         DisposeGWorld( p_vout->p_sys->p_gw[0] );
 477     }
 478     if ( p_vout->p_sys->p_gw[1] )
 479     {
 480         DisposeGWorld( p_vout->p_sys->p_gw[1] );
 481     }
 482     if ( p_vout->p_sys->p_window )
 483     {
 484         DisposeWindow( p_vout->p_sys->p_window );
 485     }
 486 #endif
 487     free( p_vout->p_sys->p_video );
 488     free( p_vout->p_sys );
 489 }
 490
 491 /*****************************************************************************
 492  * vout_Manage: handle events
 493  *****************************************************************************
 494  * This function should be called regularly by video output thread. It manages
 495  * console events. It returns a non null value on error.
 496  *****************************************************************************/
 497 static int vout_Manage( vout_thread_t *p_vout )
 498 {
 499 //    intf_ErrMsg( "vout_Manage()" );
 500     return( 0 );
 501 }
 502
 503 /*****************************************************************************
 504  * vout_Display: displays previously rendered output
 505  *****************************************************************************
 506  * This function send the currently rendered image to image, waits until
 507  * it is displayed and switch the two rendering buffers, preparing next frame.
 508  *****************************************************************************/
 509 static void vout_Display( vout_thread_t *p_vout )
 510 {
 511 //    intf_ErrMsg( "vout_Display()" );
 512
 513     BlitToWindow ( p_vout, p_vout->i_buffer_index );
 514 }
 515
 516
 517 /*****************************************************************************
 518  * flushQD: flushes buffered window area
 519   *****************************************************************************/
 520 void flushQD( vout_thread_t *p_vout )
 521 {
 522     CGrafPtr thePort;
 523
 524     //intf_ErrMsg( "flushQD()" );
 525
 526     thePort = GetWindowPort( p_vout->p_sys->p_window );
 527
 528     /* flush the entire port */
 529     if (QDIsPortBuffered(thePort))
 530         QDFlushPortBuffer(thePort, NULL);
 531
 532 #if 0
 533     /* flush part of the port */
 534     if (QDIsPortBuffered(thePort)) {
 535         RgnHandle theRgn;
 536         theRgn = NewRgn();
 537             /* local port coordinates */
 538         SetRectRgn(theRgn, 10, 10, 100, 30);
 539         QDFlushPortBuffer(thePort, theRgn);
 540         DisposeRgn(theRgn);
 541     }
 542 #endif
 543
 544 }
 545
 546 /*****************************************************************************
 547  * BlitToWindow: checks offscreen and blits it to the front
 548   *****************************************************************************/
 549
 550 void BlitToWindow( vout_thread_t *p_vout, short index )
 551 {
 552     Rect rectDest, rectSource;
 553     GrafPtr pCGrafSave, windowPort = GetWindowPort( p_vout->p_sys->p_window );
 554
 555     //intf_ErrMsg( "BlitToWindow() for %d", index );
 556
 557     GetPortBounds( p_vout->p_sys->p_gw[index], &rectSource );
 558     GetPortBounds( windowPort, &rectDest );
 559
 560     GetPort ( &pCGrafSave );
 561     SetPortWindowPort( p_vout->p_sys->p_window );
 562 //FIXME have global lock - kinda bad but oh well
 563 //    if ( LockPixels( GetGWorldPixMap( p_vout->p_sys->p_gw[index] ) ) )
 564 //    {
 565         CopyBits( GetPortBitMapForCopyBits( p_vout->p_sys->p_gw[index] ),
 566                     GetPortBitMapForCopyBits( GetWindowPort( p_vout->p_sys->p_window ) ),
 567                     &rectSource, &rectDest, srcCopy, NULL);
 568 //        UnlockPixels( GetGWorldPixMap( p_vout->p_sys->p_gw[index] ) );
 569         //flushQD( p_vout );
 570 //    }
 571     SetPort ( pCGrafSave );
 572 }
 573
 574
 575 /*****************************************************************************
 576  * GetWindowDevice: returns GDHandle that window resides on (most of it anyway)
 577  *****************************************************************************/
 578 GDHandle GetWindowDevice( vout_thread_t *p_vout )
 579 {
 580     GrafPtr pgpSave;
 581     Rect rectWind, rectSect;
 582     long greatestArea, sectArea;
 583     GDHandle hgdNthDevice, hgdZoomOnThisDevice = NULL;
 584
 585     //intf_ErrMsg( "GetWindowDevice()" );
 586
 587     GetPort( &pgpSave );
 588     SetPortWindowPort( p_vout->p_sys->p_window );
 589     GetPortBounds( GetWindowPort( p_vout->p_sys->p_window ), &rectWind );
 590     LocalToGlobal( ( Point* ) &rectWind.top );
 591     LocalToGlobal( ( Point* ) &rectWind.bottom );
 592     hgdNthDevice = GetDeviceList();
 593     greatestArea = 0;
 594     // check window against all gdRects in gDevice list and remember
 595     //  which gdRect contains largest area of window}
 596     while ( hgdNthDevice )
 597     {
 598         if ( TestDeviceAttribute( hgdNthDevice, screenDevice ) )
 599         {
 600             if ( TestDeviceAttribute( hgdNthDevice, screenActive ) )
 601             {
 602                 // The SectRect routine calculates the intersection
 603                 //  of the window rectangle and this gDevice
 604                 //  rectangle and returns TRUE if the rectangles intersect,
 605                 //  FALSE if they don't.
 606                 SectRect( &rectWind, &( **hgdNthDevice ).gdRect, &rectSect );
 607                 // determine which screen holds greatest window area
 608                 //  first, calculate area of rectangle on current device
 609                 sectArea = ( long )( rectSect.right - rectSect.left ) * ( rectSect.bottom - rectSect.top );
 610                 if ( sectArea > greatestArea )
 611                 {
 612                     greatestArea = sectArea;    // set greatest area so far
 613                     hgdZoomOnThisDevice = hgdNthDevice; // set zoom device
 614                 }
 615                 hgdNthDevice = GetNextDevice( hgdNthDevice );
 616             }
 617         }
 618     }   // of WHILE
 619     SetPort( pgpSave );
 620     return hgdZoomOnThisDevice;
 621 }
 622
 623 /*****************************************************************************
 624  * FillOffScreen: fills offscreen buffer with random bright color
 625  *****************************************************************************/
 626
 627 void FillOffscreen( vout_thread_t *p_vout, short index )
 628 {
 629     static RGBColor rgbColorOld;
 630     GDHandle hGDSave;
 631     CGrafPtr pCGrafSave;
 632     Rect rectSource;
 633     RGBColor rgbColor;
 634
 635     //intf_ErrMsg( "FillOffscreen" );
 636
 637     GetPortBounds( p_vout->p_sys->p_gw[index], &rectSource );
 638
 639     do
 640         rgbColor.red = ( Random () + 32767) / 2 + 32767;
 641     while ( abs ( rgbColor.red - rgbColorOld.red ) <  3000 );
 642     do
 643         rgbColor.green = (Random () + 32767) / 2 + 32767;
 644     while ( abs ( rgbColor.green - rgbColorOld.green ) <  3000);
 645     do
 646         rgbColor.blue = (Random () + 32767) / 2 + 32767;
 647     while ( abs ( rgbColor.blue - rgbColorOld.blue ) <  3000);
 648
 649     rgbColorOld = rgbColor;
 650
 651     GetGWorld( &pCGrafSave, &hGDSave );
 652     SetGWorld( p_vout->p_sys->p_gw[index], NULL );
 653 //FIXME have global lock - kinda bad but oh well
 654 //    if ( LockPixels( GetGWorldPixMap( p_vout->p_sys->p_gw[index] ) ) )
 655 //    {
 656         // draw some background
 657         EraseRect( &rectSource );
 658         RGBForeColor( &rgbColor );
 659         PaintRect( &rectSource );
 660 //        UnlockPixels( GetGWorldPixMap( p_vout->p_sys->p_gw[index] ) );
 661 //    }
 662     SetGWorld( pCGrafSave, hGDSave );
 663 }