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