libvo/aspect.c

   1 /* Stuff for correct aspect scaling. */
   2 #include "aspect.h"
   3 #include "geometry.h"
   4 //#ifndef ASPECT_TEST
   5 #include "mp_msg.h"
   6 //#endif
   7
   8 //#define ASPECT_DEBUG
   9
  10 #if defined(ASPECT_DEBUG) || defined(ASPECT_TEST)
  11 #include <stdio.h>
  12 #endif
  13
  14 int vo_panscan_x = 0;
  15 int vo_panscan_y = 0;
  16 float vo_panscan_amount = 0;
  17 float vo_panscanrange = 1.0;
  18
  19 #include "video_out.h"
  20
  21 float monitor_aspect=4.0/3.0;
  22 float monitor_pixel_aspect=0;
  23 extern float movie_aspect;
  24
  25 static struct {
  26   int orgw; // real width
  27   int orgh; // real height
  28   int prew; // prescaled width
  29   int preh; // prescaled height
  30   int scrw; // horizontal resolution
  31   int scrh; // vertical resolution
  32   float asp;
  33 } aspdat;
  34
  35 void aspect_save_orig(int orgw, int orgh){
  36 #ifdef ASPECT_DEBUG
  37   printf("aspect_save_orig %dx%d \n",orgw,orgh);
  38 #endif
  39   aspdat.orgw = orgw;
  40   aspdat.orgh = orgh;
  41 }
  42
  43 void aspect_save_prescale(int prew, int preh){
  44 #ifdef ASPECT_DEBUG
  45   printf("aspect_save_prescale %dx%d \n",prew,preh);
  46 #endif
  47   aspdat.prew = prew;
  48   aspdat.preh = preh;
  49 }
  50
  51 void aspect_save_screenres(int scrw, int scrh){
  52 #ifdef ASPECT_DEBUG
  53   printf("aspect_save_screenres %dx%d \n",scrw,scrh);
  54 #endif
  55   aspdat.scrw = scrw;
  56   aspdat.scrh = scrh;
  57   if (monitor_pixel_aspect)
  58     monitor_aspect = monitor_pixel_aspect * scrw / scrh;
  59 }
  60
  61 /* aspect is called with the source resolution and the
  62  * resolution, that the scaled image should fit into
  63  */
  64
  65 void aspect(int *srcw, int *srch, int zoom){
  66   int tmpw;
  67
  68   if( !zoom && geometry_wh_changed ) {
  69 #ifdef ASPECT_DEBUG
  70     printf("aspect(0) no aspect forced!\n");
  71 #endif
  72     return; // the user doesn't want to fix aspect
  73   }
  74
  75 #ifdef ASPECT_DEBUG
  76   printf("aspect(0) fitin: %dx%d zoom: %d screenaspect: %.2f\n",aspdat.scrw,aspdat.scrh,
  77       zoom,monitor_aspect);
  78   printf("aspect(1) wh: %dx%d (org: %dx%d)\n",*srcw,*srch,aspdat.prew,aspdat.preh);
  79 #endif
  80   if(zoom){
  81     *srcw = aspdat.scrw;
  82     *srch = (int)(((float)aspdat.scrw / (float)aspdat.prew * (float)aspdat.preh)
  83                * ((float)aspdat.scrh / ((float)aspdat.scrw / monitor_aspect)));
  84   }else{
  85     *srcw = aspdat.prew;
  86     *srch = (int)((float)aspdat.preh
  87                * ((float)aspdat.scrh / ((float)aspdat.scrw / monitor_aspect)));
  88   }
  89   *srch+= *srch%2; // round
  90 #ifdef ASPECT_DEBUG
  91   printf("aspect(2) wh: %dx%d (org: %dx%d)\n",*srcw,*srch,aspdat.prew,aspdat.preh);
  92 #endif
  93   if(*srch>aspdat.scrh || *srch<aspdat.orgh){
  94     if(zoom)
  95       tmpw = (int)(((float)aspdat.scrh / (float)aspdat.preh * (float)aspdat.prew)
  96                 * ((float)aspdat.scrw / ((float)aspdat.scrh / (1.0/monitor_aspect))));
  97     else
  98       tmpw = (int)((float)aspdat.prew
  99                 * ((float)aspdat.scrw / ((float)aspdat.scrh / (1.0/monitor_aspect))));
 100     tmpw+= tmpw%2; // round
 101     if(tmpw<=aspdat.scrw /*&& tmpw>=aspdat.orgw*/){
 102       *srch = zoom?aspdat.scrh:aspdat.preh;
 103       *srcw = tmpw;
 104     }else{
 105 #ifndef ASPECT_TEST
 106       mp_msg(MSGT_VO,MSGL_WARN,"aspect: Warning: no suitable new res found!\n");
 107 #else
 108       mp_msg(MSGT_VO,MSGL_WARN,"error: no new size found that fits into res!\n");
 109 #endif
 110     }
 111   }
 112   aspdat.asp=*srcw / (float)*srch;
 113 #ifdef ASPECT_DEBUG
 114   printf("aspect(3) wh: %dx%d (org: %dx%d)\n",*srcw,*srch,aspdat.prew,aspdat.preh);
 115 #endif
 116 }
 117
 118 void panscan_init( void )
 119 {
 120  vo_panscan_x=0;
 121  vo_panscan_y=0;
 122  vo_panscan_amount=0.0f;
 123 }
 124
 125 void panscan_calc( void )
 126 {
 127  int fwidth,fheight;
 128  int vo_panscan_area;
 129
 130  if (vo_panscanrange > 0) {
 131  aspect(&fwidth,&fheight,A_ZOOM);
 132  vo_panscan_area = (aspdat.scrh-fheight);
 133    vo_panscan_area *= vo_panscanrange;
 134  } else
 135    vo_panscan_area = -vo_panscanrange * aspdat.scrh;
 136
 137  vo_panscan_amount = vo_fs ? vo_panscan : 0;
 138  vo_panscan_x = vo_panscan_area * vo_panscan_amount * aspdat.asp;
 139  vo_panscan_y = vo_panscan_area * vo_panscan_amount;
 140 }
 141