cinelerra-5.1/cinelerra/rescale.C

   1 #include "rescale.h"
   2 #include "indexable.h"
   3 #include "mwindow.h"
   4
   5 const char *Rescale::scale_types[] = {
   6   "None", "Scaled", "Cropped", "Filled", "Horiz Edge", "Vert Edge",
   7 };
   8
   9 Rescale::Rescale(int w, int h, double aspect)
  10 {
  11         this->w = w;
  12         this->h = h;
  13         this->aspect = aspect;
  14 }
  15
  16 Rescale::Rescale(Indexable *in)
  17 {
  18         this->w = in->get_w();
  19         this->h = in->get_h();
  20         float aw, ah;
  21         MWindow::create_aspect_ratio(aw, ah, this->w, this->h);
  22         this->aspect = ah > 0 ? aw / ah : 1;
  23 }
  24
  25 Rescale::~Rescale()
  26 {
  27 }
  28
  29 void Rescale::rescale(Rescale &out, int type,
  30                 float &src_w,float &src_h, float &dst_w,float &dst_h)
  31 {
  32         int in_w = w, in_h = h;
  33         int out_w = out.w, out_h = out.h;
  34
  35         src_w = in_w;  src_h = in_h;
  36         dst_w = out_w; dst_h = out_h;
  37         double r = out.aspect / aspect;
  38
  39         switch( type ) {
  40         case cropped:
  41                 if( r < 1 )
  42                         src_w = in_w * r;
  43                 else
  44                         src_h = in_h / r;
  45                 break;
  46         case filled:
  47                 if( r < 1 )
  48                         dst_h = out_h * r;
  49                 else
  50                         dst_w = out_w / r;
  51                 break;
  52         case horiz_edge:
  53                 if( r < 1 )
  54                         dst_h = out_h * r;
  55                 else
  56                         src_h = in_h / r;
  57                 break;
  58         case vert_edge:
  59                 if( r < 1 )
  60                         src_w = in_w * r;
  61                 else
  62                         dst_w = out_w / r;
  63                 break;
  64         default:
  65                 break;
  66         }
  67 }
  68