git.sesse.net Git - vlc/blob - modules/video_filter/magnify.c

   1 /*****************************************************************************
   2  * magnify.c : Magnify/Zoom interactive effect
   3  *****************************************************************************
   4  * Copyright (C) 2005 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Antoine Cellerier <dionoea -at- videolan -dot- org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #include <vlc/vlc.h>
  29 #include <vlc_vout.h>
  30
  31 #include <math.h>
  32
  33 #include "filter_common.h"
  34 #include "filter_picture.h"
  35
  36 #include "vlc_image.h"
  37 #include "vlc_input.h"
  38 #include "vlc_playlist.h"
  39
  40 /*****************************************************************************
  41  * Local prototypes
  42  *****************************************************************************/
  43 static int  Create    ( vlc_object_t * );
  44 static void Destroy   ( vlc_object_t * );
  45
  46 static int  Init      ( vout_thread_t * );
  47 static void End       ( vout_thread_t * );
  48 static void Render    ( vout_thread_t *, picture_t * );
  49
  50 static int  SendEvents   ( vlc_object_t *, char const *,
  51                            vlc_value_t, vlc_value_t, void * );
  52 static int  MouseEvent   ( vlc_object_t *, char const *,
  53                            vlc_value_t, vlc_value_t, void * );
  54
  55 /*****************************************************************************
  56  * Module descriptor
  57  *****************************************************************************/
  58 vlc_module_begin();
  59     set_description( _("Magnify/Zoom interactive video filter") );
  60     set_shortname( _( "Magnify" ));
  61     set_capability( "video filter", 0 );
  62     set_category( CAT_VIDEO );
  63     set_subcategory( SUBCAT_VIDEO_VFILTER );
  64
  65     set_callbacks( Create, Destroy );
  66 vlc_module_end();
  67
  68 /*****************************************************************************
  69  * vout_sys_t: Magnify video output method descriptor
  70  *****************************************************************************/
  71 struct vout_sys_t
  72 {
  73     vout_thread_t *p_vout;
  74
  75     image_handler_t *p_image;
  76
  77     int i_zoom; /* zoom level in percent */
  78     int i_x, i_y; /* top left corner coordinates in original image */
  79
  80     vlc_bool_t b_visible; /* is "interface" visible ? */
  81 };
  82
  83 /*****************************************************************************
  84  * Control: control facility for the vout (forwards to child vout)
  85  *****************************************************************************/
  86 static int Control( vout_thread_t *p_vout, int i_query, va_list args )
  87 {
  88     return vout_vaControl( p_vout->p_sys->p_vout, i_query, args );
  89 }
  90
  91 /*****************************************************************************
  92  * Create: allocates Magnify video thread output method
  93  *****************************************************************************/
  94 static int Create( vlc_object_t *p_this )
  95 {
  96     vout_thread_t *p_vout = (vout_thread_t *)p_this;
  97
  98     switch( p_vout->fmt_in.i_chroma )
  99     {
 100         CASE_PLANAR_YUV
 101         case VLC_FOURCC('G','R','E','Y'):
 102             break;
 103         default:
 104             msg_Err( p_vout, "Unsupported chroma" );
 105             return VLC_EGENERIC;
 106     }
 107
 108     /* Allocate structure */
 109     p_vout->p_sys = malloc( sizeof( vout_sys_t ) );
 110     if( p_vout->p_sys == NULL )
 111     {
 112         msg_Err( p_vout, "out of memory" );
 113         return VLC_ENOMEM;
 114     }
 115
 116     p_vout->p_sys->p_image = image_HandlerCreate( p_vout );
 117
 118     p_vout->pf_init = Init;
 119     p_vout->pf_end = End;
 120     p_vout->pf_manage = NULL;
 121     p_vout->pf_render = Render;
 122     p_vout->pf_display = NULL;
 123     p_vout->pf_control = Control;
 124
 125     return VLC_SUCCESS;
 126 }
 127
 128 /*****************************************************************************
 129  * Init: initialize Magnify video thread output method
 130  *****************************************************************************/
 131 static int Init( vout_thread_t *p_vout )
 132 {
 133     int i_index;
 134     picture_t *p_pic;
 135     video_format_t fmt;
 136
 137     memset( &fmt, 0, sizeof(video_format_t) );
 138     I_OUTPUTPICTURES = 0;
 139
 140     /* Initialize the output structure */
 141     p_vout->output.i_chroma = p_vout->render.i_chroma;
 142     p_vout->output.i_width  = p_vout->render.i_width;
 143     p_vout->output.i_height = p_vout->render.i_height;
 144     p_vout->output.i_aspect = p_vout->render.i_aspect;
 145
 146     p_vout->fmt_out = p_vout->fmt_in;
 147     fmt = p_vout->fmt_out;
 148
 149     /* Try to open the real video output */
 150     msg_Dbg( p_vout, "spawning the real video output" );
 151
 152     p_vout->p_sys->p_vout = vout_Create( p_vout, &fmt );
 153
 154     /* Everything failed */
 155     if( p_vout->p_sys->p_vout == NULL )
 156     {
 157         msg_Err( p_vout, "cannot open vout, aborting" );
 158         return VLC_EGENERIC;
 159     }
 160
 161 #define VIS_ZOOM 4
 162     p_vout->p_sys->i_x = 0;
 163     p_vout->p_sys->i_y = 0;
 164 #define ZOOM_FACTOR 8
 165     p_vout->p_sys->i_zoom = 2*ZOOM_FACTOR;
 166     p_vout->p_sys->b_visible = VLC_TRUE;
 167
 168     var_AddCallback( p_vout->p_sys->p_vout, "mouse-x", MouseEvent, p_vout );
 169     var_AddCallback( p_vout->p_sys->p_vout, "mouse-y", MouseEvent, p_vout );
 170     var_AddCallback( p_vout->p_sys->p_vout, "mouse-clicked",
 171                      MouseEvent, p_vout);
 172
 173     ALLOCATE_DIRECTBUFFERS( VOUT_MAX_PICTURES );
 174     ADD_CALLBACKS( p_vout->p_sys->p_vout, SendEvents );
 175     ADD_PARENT_CALLBACKS( SendEventsToChild );
 176
 177     return VLC_SUCCESS;
 178 }
 179
 180 /*****************************************************************************
 181  * End: terminate Magnify video thread output method
 182  *****************************************************************************/
 183 static void End( vout_thread_t *p_vout )
 184 {
 185     int i_index;
 186
 187     /* Free the fake output buffers we allocated */
 188     for( i_index = I_OUTPUTPICTURES ; i_index ; )
 189     {
 190         i_index--;
 191         free( PP_OUTPUTPICTURE[ i_index ]->p_data_orig );
 192     }
 193
 194     var_DelCallback( p_vout->p_sys->p_vout, "mouse-x", MouseEvent, p_vout);
 195     var_DelCallback( p_vout->p_sys->p_vout, "mouse-y", MouseEvent, p_vout);
 196     var_DelCallback( p_vout->p_sys->p_vout, "mouse-clicked", MouseEvent, p_vout);
 197 }
 198
 199 /*****************************************************************************
 200  * Destroy: destroy Magnify video thread output method
 201  *****************************************************************************/
 202 static void Destroy( vlc_object_t *p_this )
 203 {
 204     vout_thread_t *p_vout = (vout_thread_t *)p_this;
 205
 206     if( p_vout->p_sys->p_vout )
 207     {
 208         DEL_CALLBACKS( p_vout->p_sys->p_vout, SendEvents );
 209         vlc_object_detach( p_vout->p_sys->p_vout );
 210         vout_Destroy( p_vout->p_sys->p_vout );
 211     }
 212
 213     image_HandlerDelete( p_vout->p_sys->p_image );
 214
 215     DEL_PARENT_CALLBACKS( SendEventsToChild );
 216
 217     free( p_vout->p_sys );
 218 }
 219
 220 /*****************************************************************************
 221  * Render: displays previously rendered output
 222  *****************************************************************************/
 223 static void Render( vout_thread_t *p_vout, picture_t *p_pic )
 224 {
 225     picture_t *p_outpic;
 226
 227     int o_x = p_vout->p_sys->i_x;
 228     int o_y = p_vout->p_sys->i_y;
 229     int o_zoom = p_vout->p_sys->i_zoom;
 230     int x,y,o_yp,o_xp;
 231     int v_w, v_h;
 232     video_format_t fmt_out;
 233     picture_t *p_converted;
 234     plane_t *p_oyp=NULL;
 235     int i_plane;
 236
 237     memset( &fmt_out, 0, sizeof(video_format_t) );
 238     /* This is a new frame. Get a structure from the video_output. */
 239     while( ( p_outpic = vout_CreatePicture( p_vout->p_sys->p_vout, 0, 0, 0 ) )
 240               == NULL )
 241     {
 242         if( p_vout->b_die || p_vout->b_error )
 243         {
 244             return;
 245         }
 246         msleep( VOUT_OUTMEM_SLEEP );
 247     }
 248
 249     vout_DatePicture( p_vout->p_sys->p_vout, p_outpic, p_pic->date );
 250
 251     p_oyp = &(p_outpic->p[Y_PLANE]);
 252
 253     /* background magnified image */
 254     if( o_zoom != ZOOM_FACTOR )
 255     {
 256         for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 257         {
 258             o_yp = o_y*p_outpic->p[i_plane].i_lines
 259                    /p_outpic->p[Y_PLANE].i_lines;
 260             o_xp = o_x*p_outpic->p[i_plane].i_pitch
 261                    /p_outpic->p[Y_PLANE].i_pitch;
 262             int i_pitch = p_outpic->p[i_plane].i_pitch;
 263 #if 0
 264             int o_zoom2 = o_zoom*o_zoom;
 265             int o_zoom3 = o_zoom*o_zoom*o_zoom;
 266             int o_zoom4 = o_zoom*o_zoom*o_zoom*o_zoom;
 267             int o_zoom6 = o_zoom*o_zoom*o_zoom * o_zoom*o_zoom*o_zoom;
 268 #endif
 269             for( y=0; y<p_outpic->p[i_plane].i_visible_lines; y++ )
 270             {
 271                 for( x=0; x<p_outpic->p[i_plane].i_visible_pitch; x++ )
 272                 {
 273 #if 0
 274                     /* Nearest neighbor */
 275                     int nx = o_xp + x*ZOOM_FACTOR/o_zoom;
 276                     int ny = o_yp + y*ZOOM_FACTOR/o_zoom;
 277                     p_outpic->p[i_plane].p_pixels[y*i_pitch+x] =
 278                         p_pic->p[i_plane].p_pixels[ny*i_pitch+nx];
 279 #elif 1
 280                     /* Bi-linear */
 281                     int nx_real = o_xp*o_zoom + x*ZOOM_FACTOR;
 282                     int ny_real = o_yp*o_zoom + y*ZOOM_FACTOR;
 283                     int nx = nx_real/o_zoom;
 284                     int ny = ny_real/o_zoom;
 285                     int wtl = ((nx+1)*o_zoom-nx_real)*((ny+1)*o_zoom-ny_real);
 286                     int wtr = (nx_real-nx*o_zoom)*((ny+1)*o_zoom-ny_real);
 287                     int wbl = ((nx+1)*o_zoom-nx_real)*(ny_real-ny*o_zoom);
 288                     int wbr = (nx_real-nx*o_zoom)*(ny_real-ny*o_zoom);
 289                     p_outpic->p[i_plane].p_pixels[y*i_pitch+x] =
 290                         ( wtl*p_pic->p[i_plane].p_pixels[ny*i_pitch+nx]
 291                         + wtr*p_pic->p[i_plane].p_pixels[ny*i_pitch+(nx+1)]
 292                         + wbl*p_pic->p[i_plane].p_pixels[(ny+1)*i_pitch+nx]
 293                         + wbr*p_pic->p[i_plane].p_pixels[(ny+1)*i_pitch+(nx+1)]
 294                         ) / (o_zoom*o_zoom);
 295 #else
 296                     /* Bi-cubic */
 297                     /* FIXME: doesn't work */
 298                     /* \Sigma_{i=0..3} \Sigma_{j=0..3} \alpha_{i,j} x^i y^j
 299                      * 16 \alpha_{i,j} so we need to use the 16 nearest pixels
 300                      *
 301                      * In fact we should be able to write it as:
 302                      * \Pi_{i=1..16} [ \Pi_{j!=i} ( x - x_j ) * ( y - y_j ) ]
 303                      *   * z_i / [ \Pi_{j!=i} ( x_i - x_j ) * ( y_i - y_j ) ]
 304                      * We also have to make sure that we don't use any
 305                      * x_j == x_i or y_j == y_i in the \Pi on j (else we get
 306                      * a 0/0 which kind of sucks) .
 307                      */
 308                     uint8_t *p = p_pic->p[i_plane].p_pixels;
 309                     int nx_real = o_xp*o_zoom + x*ZOOM_FACTOR;
 310                     int ny_real = o_yp*o_zoom + y*ZOOM_FACTOR;
 311
 312                     int nx = nx_real/o_zoom;
 313                     int ny = ny_real/o_zoom;
 314
 315                     int xi, yi, xj, yj;
 316                     int my = __MAX( ny-1, 0 );
 317                     int mx = __MAX( nx-1, 0 );
 318                     //p_outpic->p[i_plane].i_visible_lines - 4
 319                     //p_outpic->p[i_plane].i_visible_pitch - 4
 320                     int v = 1;
 321                     for( yi = my; yi <= my+3; yi++ )
 322                     {
 323                         int numy = 1;
 324                         int deny = 1;
 325                         /*
 326                         for( yj = my; yj <= my+3; yj++ )
 327                         {
 328                             if( yj != yi )
 329                             {
 330                                 numy *= (ny_real-yj*o_zoom);
 331                                 deny *= (yi - yj);
 332                             }
 333                         }
 334                         numy /= o_zoom2;*/
 335                         for( xi = mx; xi <= mx+3; xi++ )
 336                         {
 337                             int num = numy;
 338                             int den = deny;
 339                             for( xj = mx; xj <= mx+3; xj++ )
 340                             {
 341                                 if( xj != xi )
 342                                 {
 343                                     num *= (nx_real-xj*o_zoom);
 344                                     den *= (xi - xj);
 345                                 }
 346                             }
 347                             v = ( v * (p[yi*i_pitch+xi] * num) ) / ( den * o_zoom3 );
 348                         }
 349                     }
 350                     p_outpic->p[i_plane].p_pixels[y*i_pitch+x] = v;
 351 #endif
 352                 }
 353             }
 354         }
 355     }
 356     else
 357     {
 358         for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 359         {
 360         p_vout->p_libvlc->
 361         pf_memcpy( p_outpic->p[i_plane].p_pixels, p_pic->p[i_plane].p_pixels,
 362             p_outpic->p[i_plane].i_lines * p_outpic->p[i_plane].i_pitch );
 363         }
 364     }
 365
 366     if( p_vout->p_sys->b_visible )
 367     {
 368         /* image visualization */
 369         fmt_out = p_vout->fmt_out;
 370         fmt_out.i_width = p_vout->render.i_width/VIS_ZOOM;
 371         fmt_out.i_height = p_vout->render.i_height/VIS_ZOOM;
 372         p_converted = image_Convert( p_vout->p_sys->p_image, p_pic,
 373                                      &(p_pic->format), &fmt_out );
 374         for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 375         {
 376             for( y=0; y<p_converted->p[i_plane].i_visible_lines; y++)
 377             {
 378                 p_vout->p_libvlc->pf_memcpy(
 379                 p_outpic->p[i_plane].p_pixels+y*p_outpic->p[i_plane].i_pitch,
 380                 p_converted->p[i_plane].p_pixels+y*p_converted->p[i_plane].i_pitch,
 381                 p_converted->p[i_plane].i_visible_pitch );
 382             }
 383         }
 384         p_converted->pf_release( p_converted );
 385
 386         /* white rectangle on visualization */
 387         v_w = p_oyp->i_pitch*ZOOM_FACTOR/(VIS_ZOOM*o_zoom);
 388         v_h = (o_y+p_oyp->i_lines*ZOOM_FACTOR/o_zoom)/VIS_ZOOM;
 389         /* top line */
 390         p_vout->p_libvlc->pf_memset( p_oyp->p_pixels
 391                                      + o_y/VIS_ZOOM*p_oyp->i_pitch
 392                                      + o_x/VIS_ZOOM, 0xff, v_w+1 );
 393
 394         for( y = o_y/VIS_ZOOM+1; y < v_h; y++ )
 395         {
 396             /* left line */
 397             p_oyp->p_pixels[
 398                 y*p_oyp->i_pitch+o_x/VIS_ZOOM
 399             ] = 0xff;
 400             /* right line */
 401             p_oyp->p_pixels[
 402                 y*p_oyp->i_pitch+o_x/VIS_ZOOM + v_w
 403             ] = 0xff;
 404         }
 405         /* bottom line */
 406         p_vout->p_libvlc->pf_memset( p_oyp->p_pixels
 407                                      + v_h*p_oyp->i_pitch
 408                                      + o_x/VIS_ZOOM, 0xff, v_w+1 );
 409
 410         /* */
 411         v_h = p_oyp->i_lines/VIS_ZOOM;
 412     }
 413     else
 414     {
 415         v_h = 1;
 416     }
 417
 418     /* print a small "VLC ZOOM" ... gruikkkkkkkkk */
 419 #define DRAW(a) {int c,l=1;L a;}
 420 #define L ;l++,c=1
 421 #define X ;draw(l,c);c+=1
 422 #define o +1
 423 #define draw(y,x) p_oyp->p_pixels[(v_h+y)*p_oyp->i_pitch+x] = 0xff;
 424 if( p_vout->p_sys->b_visible )
 425 DRAW(
 426 X o o o X o X o o o o o o X X X X o o o X X X X X o o X X X o o o X X X o o X X o X X o o o X o o o X o X X X X X o X X X X o o X X X X X L
 427 X o o o X o X o o o o o X o o o o o o o o o o X o o X o o o X o X o o o X o X o X o X o o o X o o o X o o o X o o o X o o o X o X o o o o L
 428 o X o X o o X o o o o o X o o o o o o o o o X o o o X o o o X o X o o o X o X o o o X o o o X X X X X o o o X o o o X o o o X o X X X X o L
 429 o X o X o o X o o o o o X o o o o o o o o X o o o o X o o o X o X o o o X o X o o o X o o o X o o o X o o o X o o o X o o o X o X o o o o L
 430 o o X o o o X X X X X o o X X X X o o o X X X X X o o X X X o o o X X X o o X o o o X o o o X o o o X o X X X X X o X X X X o o X X X X X L
 431 )
 432 else
 433 DRAW(
 434 X o o o X o X o o o o o o X X X X o o o X X X X X o o X X X o o o X X X o o X X o X X o o o o X X X X o X o o o X o o X X X o o X o o o X L
 435 X o o o X o X o o o o o X o o o o o o o o o o X o o X o o o X o X o o o X o X o X o X o o o X o o o o o X o o o X o X o o o X o X o o o X L
 436 o X o X o o X o o o o o X o o o o o o o o o X o o o X o o o X o X o o o X o X o o o X o o o o X X X o o X X X X X o X o o o X o X o X o X L
 437 o X o X o o X o o o o o X o o o o o o o o X o o o o X o o o X o X o o o X o X o o o X o o o o o o o X o X o o o X o X o o o X o X o X o X L
 438 o o X o o o X X X X X o o X X X X o o o X X X X X o o X X X o o o X X X o o X o o o X o o o X X X X o o X o o o X o o X X X o o o X o X o L
 439 )
 440 #undef DRAW
 441 #undef L
 442 #undef X
 443 #undef O
 444 #undef draw
 445
 446     if( p_vout->p_sys->b_visible )
 447     {
 448         /* zoom gauge */
 449         p_vout->p_libvlc->pf_memset( p_oyp->p_pixels
 450                                      + (v_h+9)*p_oyp->i_pitch,
 451                                      0xff, 41 );
 452         for( y = v_h + 10; y < v_h + 90; y++ )
 453         {
 454             int width = v_h + 90 - y;
 455             width = (width*width)/160;
 456             if( (80 - y + v_h)*10 < o_zoom )
 457             {
 458                 p_vout->p_libvlc->pf_memset( p_oyp->p_pixels
 459                                              + y*p_oyp->i_pitch,
 460                                              0xff, width );
 461             }
 462             else
 463             {
 464                 p_oyp->p_pixels[y*p_oyp->i_pitch] = 0xff;
 465                 p_oyp->p_pixels[y*p_oyp->i_pitch + width - 1] = 0xff;
 466             }
 467         }
 468     }
 469
 470     vout_DisplayPicture( p_vout->p_sys->p_vout, p_outpic );
 471 }
 472
 473 /*****************************************************************************
 474  * SendEvents: forward mouse and keyboard events to the parent p_vout
 475  *****************************************************************************/
 476 static int SendEvents( vlc_object_t *p_this, char const *psz_var,
 477                        vlc_value_t oldval, vlc_value_t newval, void *p_data )
 478 {
 479     var_Set( (vlc_object_t *)p_data, psz_var, newval );
 480
 481     return VLC_SUCCESS;
 482 }
 483
 484 /*****************************************************************************
 485  * SendEventsToChild: forward events to the child/children vout
 486  *****************************************************************************/
 487 static int SendEventsToChild( vlc_object_t *p_this, char const *psz_var,
 488                        vlc_value_t oldval, vlc_value_t newval, void *p_data )
 489 {
 490     vout_thread_t *p_vout = (vout_thread_t *)p_this;
 491     var_Set( p_vout->p_sys->p_vout, psz_var, newval );
 492     return VLC_SUCCESS;
 493 }
 494
 495 /*****************************************************************************
 496  * MouseEvent: callback for mouse events
 497  *****************************************************************************/
 498 static int MouseEvent( vlc_object_t *p_this, char const *psz_var,
 499                        vlc_value_t oldval, vlc_value_t newval, void *p_data )
 500 {
 501     vout_thread_t *p_vout = (vout_thread_t*)p_data;
 502     vlc_value_t vald,valx,valy;
 503
 504 #define MOUSE_DOWN    1
 505 #define MOUSE_CLICKED 2
 506 #define MOUSE_MOVE_X  4
 507 #define MOUSE_MOVE_Y  8
 508 #define MOUSE_MOVE    12
 509     uint8_t mouse= 0;
 510
 511     int v_h = p_vout->output.i_height*ZOOM_FACTOR/p_vout->p_sys->i_zoom;
 512     int v_w = p_vout->output.i_width*ZOOM_FACTOR/p_vout->p_sys->i_zoom;
 513
 514     if( psz_var[6] == 'x' ) mouse |= MOUSE_MOVE_X;
 515     if( psz_var[6] == 'y' ) mouse |= MOUSE_MOVE_Y;
 516     if( psz_var[6] == 'c' ) mouse |= MOUSE_CLICKED;
 517
 518     var_Get( p_vout->p_sys->p_vout, "mouse-button-down", &vald );
 519     if( vald.i_int & 0x1 ) mouse |= MOUSE_DOWN;
 520     var_Get( p_vout->p_sys->p_vout, "mouse-y", &valy );
 521     var_Get( p_vout->p_sys->p_vout, "mouse-x", &valx );
 522
 523     if( ( mouse&MOUSE_MOVE && mouse&MOUSE_DOWN)
 524         || mouse&MOUSE_CLICKED )
 525     {
 526     /* (mouse moved and mouse button is down) or (mouse clicked) */
 527         if( p_vout->p_sys->b_visible )
 528         {
 529             if(    0 <= valy.i_int
 530                 && valy.i_int < (int)p_vout->output.i_height/VIS_ZOOM
 531                 && 0 <= valx.i_int
 532                 && valx.i_int < (int)p_vout->output.i_width/VIS_ZOOM )
 533             {
 534             /* mouse is over visualisation */
 535                 p_vout->p_sys->i_x = __MIN( __MAX( valx.i_int*VIS_ZOOM - v_w/2, 0 ),
 536                                             p_vout->output.i_width - v_w - 1);
 537                 p_vout->p_sys->i_y = __MIN( __MAX( valy.i_int * VIS_ZOOM - v_h/2,
 538                                         0 ), p_vout->output.i_height - v_h - 1);
 539             }
 540             else if( valx.i_int >= 0 && valx.i_int < 80
 541                 && valy.i_int >= (int)p_vout->output.i_height/VIS_ZOOM
 542                 && valy.i_int < (int)p_vout->output.i_height/VIS_ZOOM + 9
 543                 && mouse&MOUSE_CLICKED )
 544             {
 545             /* mouse is over the "VLC ZOOM HIDE" text */
 546                 p_vout->p_sys->b_visible = VLC_FALSE;
 547             }
 548             else if(    (int)p_vout->output.i_height/VIS_ZOOM + 9 <= valy.i_int
 549                      && valy.i_int <= (int)p_vout->output.i_height/VIS_ZOOM + 90
 550                      && 0 <= valx.i_int
 551                      && valx.i_int <=
 552                      (( (int)p_vout->output.i_height/VIS_ZOOM + 90 -  valy.i_int)
 553                *( (int)p_vout->output.i_height/VIS_ZOOM + 90 -  valy.i_int))/160 )
 554             {
 555             /* mouse is over zoom gauge */
 556                 p_vout->p_sys->i_zoom = __MAX( ZOOM_FACTOR,
 557                                 ( 80 + (int)p_vout->output.i_height/VIS_ZOOM
 558                                    - valy.i_int + 2) * ZOOM_FACTOR/10 );
 559             }
 560             else if( mouse&MOUSE_MOVE_X && !(mouse&MOUSE_CLICKED) )
 561             {
 562                 p_vout->p_sys->i_x -= (newval.i_int - oldval.i_int)
 563                                       *ZOOM_FACTOR/p_vout->p_sys->i_zoom;
 564             }
 565             else if( mouse&MOUSE_MOVE_Y && !(mouse&MOUSE_CLICKED) )
 566             {
 567                 p_vout->p_sys->i_y -= (newval.i_int - oldval.i_int)
 568                                       *ZOOM_FACTOR/p_vout->p_sys->i_zoom;
 569             }
 570         }
 571         else
 572         {
 573             if( valx.i_int >= 0 && valx.i_int < 80 && valy.i_int >= 0
 574                 && valy.i_int <= 10 && mouse&MOUSE_CLICKED )
 575             {
 576             /* mouse is over the "VLC ZOOM SHOW" text */
 577                 p_vout->p_sys->b_visible = VLC_TRUE;
 578             }
 579             else if( mouse&MOUSE_MOVE_X && !(mouse&MOUSE_CLICKED) )
 580             {
 581                 p_vout->p_sys->i_x -= (newval.i_int - oldval.i_int)
 582                                       *ZOOM_FACTOR/p_vout->p_sys->i_zoom;
 583             }
 584             else if( mouse&MOUSE_MOVE_Y && !(mouse&MOUSE_CLICKED) )
 585             {
 586                 p_vout->p_sys->i_y -= (newval.i_int - oldval.i_int)
 587                                       *ZOOM_FACTOR/p_vout->p_sys->i_zoom;
 588             }
 589         }
 590     }
 591
 592     p_vout->p_sys->i_x =
 593          __MAX( 0, __MIN( p_vout->p_sys->i_x, (int)p_vout->output.i_width
 594          - (int)p_vout->output.i_width*ZOOM_FACTOR/p_vout->p_sys->i_zoom - 1 ));
 595     p_vout->p_sys->i_y =
 596          __MAX( 0, __MIN( p_vout->p_sys->i_y, (int)p_vout->output.i_height
 597         - (int)p_vout->output.i_height*ZOOM_FACTOR/p_vout->p_sys->i_zoom - 1 ));
 598
 599
 600     return VLC_SUCCESS;
 601 }