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revision 707, Thu Dec 12 10:38:28 2002 UTC revision 708, Thu Dec 12 12:40:19 2002 UTC
# Line 476  Line 476 
476  }  }
477    
478    
479    /*
480    chroma optimize filter, invented by mf
481    a chroma pixel is average from the surrounding pixels, when the
482    correpsonding luma pixels are pure black or white.
483    */
484    
485    void
486    image_chroma_optimize(IMAGE * img, int width, int height, int edged_width)
487    {
488            int x,y;
489            int pixels = 0;
490    
491            for (y = 1; y < height/2 - 1; y++)
492            for (x = 1; x < width/2 - 1; x++)
493            {
494    #define IS_PURE(a)  ((a)<=16||(a)>=235)
495    #define IMG_Y(Y,X)      img->y[(Y)*edged_width + (X)]
496    #define IMG_U(Y,X)      img->u[(Y)*edged_width/2 + (X)]
497    #define IMG_V(Y,X)      img->v[(Y)*edged_width/2 + (X)]
498    
499                    if (IS_PURE(IMG_Y(y*2  ,x*2  )) &&
500                            IS_PURE(IMG_Y(y*2  ,x*2+1)) &&
501                            IS_PURE(IMG_Y(y*2+1,x*2  )) &&
502                            IS_PURE(IMG_Y(y*2+1,x*2+1)))
503                    {
504                            IMG_U(y,x) = (IMG_U(y,x-1) + IMG_U(y-1, x) + IMG_U(y, x+1) + IMG_U(y+1, x)) / 4;
505                            IMG_V(y,x) = (IMG_V(y,x-1) + IMG_V(y-1, x) + IMG_V(y, x+1) + IMG_V(y+1, x)) / 4;
506                            pixels++;
507                    }
508    
509    #undef IS_PURE
510    #undef IMG_Y
511    #undef IMG_U
512    #undef IMG_V
513            }
514    
515            DPRINTF(DPRINTF_DEBUG,"chroma_optimized_pixels = %i/%i", pixels, width*height/4);
516    }
517    
518    
519    
520    
521    
522  /*  /*
523    perform safe packed colorspace conversion, by splitting    perform safe packed colorspace conversion, by splitting

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