imagebox.cpp

此源码是在VC平台下,实现MPEG4编解码的源码

	}
      }
    }
    
  next:
    /* quantize the min_x and min_y with Nx and Ny */
    if(min_x%Nx!=0) min_x=min_x/Nx*Nx;
    if(min_y%Ny!=0) min_y=min_y/Ny*Ny;
    if(min_x>max_x || min_y> max_y) {
      return(DWT_NOVALID_PIXEL); /* no valid pixel */
    }
    origin_x = min_x;
    origin_y = min_y;
    virtual_width = max_x-min_x+1;
    virtual_height = max_y-min_y+1;
   /*  fprIntf(stderr, "x=%d y=%d w=%d h=%d x2=%d y2=%d\n", min_x, min_y, virtual_width, virtual_height, max_x, max_y); */
  }
  else { /* rectangular region */
    origin_x = 0; 
    origin_y = 0;
    virtual_width = RealWidth;
    virtual_height = RealHeight;
  }  
  
  /* first ajust the dimension to be multiple of blocksize */
  virtual_width =  (virtual_width+(blocksize)-1)/blocksize*blocksize;
  virtual_height =  (virtual_height+(blocksize)-1)/blocksize*blocksize;
  if ((mask = (UChar *)malloc(sizeof(UChar)*virtual_width*virtual_height)) == NULL) {
    return(DWT_MEMORY_FAILED);
  }
  memset(mask, (Char )0, sizeof(UChar)*virtual_width*virtual_height);
  /* calculate clip area */
  max_y = origin_y+virtual_height;
  max_y = (max_y<real_height)?max_y:real_height;
  rows = max_y - origin_y;
  max_x = origin_x+virtual_width;
  max_x = (max_x<real_width)?max_x:real_width;
  cols = max_x - origin_x;
  /* fill out data */
  for(i=0, j=origin_y*real_width+origin_x; i< rows*virtual_width;
      i+=virtual_width, j+=real_width) {
    if(Shape != RECTANGULAR) {
      f = InMask+j+cols;
      for(a = InMask+j, b=mask+i; a < f; a++, b++) {
	if(*a == (UChar) Shape) *b = DWT_IN;
      }
    }
    else
      memset(mask+i, (Char )DWT_IN, cols);
  }
  *VirtualWidth = virtual_width;
  *VirtualHeight = virtual_height;
  *OriginX = origin_x;
  *OriginY = origin_y;
  *OutMask = mask;
  return(DWT_OK);
}

/* Function: ExtendMaskBox()
   Description: extend the size of bounding box of the mask of image object
                to 2^nLevels;
   Input:
   
   InMask -- Input image mask
   InWidth, InHeight  -- the size of the Input Mask;
   Nx, Ny -- specify  that OriginX and OriginY must be multiple of Nx and Ny
             to accomdate different color compoents configuration:
	     Examples:
	     for 420:   Nx  Ny 
	           Y:   2   2
                   U,V: 1   1
	     for 422:   
	           Y:   2   1
             for 444:
	      Y,U,V:    1   1
	     for mono:
                  Y:    1   1
	     for YUV9:  
                  Y:    4   4
                  U,V:  1   1     nLevels -- levels of decomposition
   Output:
   
   OutMask -- Output image mask, extended area is marked as Don't-care
   OutWidth, OutHeight -- size of the output mask
		       
   Return:  DWT_OK if no error;	       
   Note: The caller should free the memory OutMask allocated by this program 
         after it finishes using them.
*/

Int VTCIMAGEBOX:: ExtendMaskBox(UChar *InMask,  UChar **OutMask, 
		  Int InWidth, Int InHeight, 
		  Int Nx, Int Ny,
		  Int *OutWidth, Int *OutHeight, 
		  Int nLevels)
{
  Int out_width, out_height;
  UChar *mask;
  Int blocksize =  1 << nLevels;
  Int i, j;
  UChar *a, *b, *f;

  if(blocksize%Nx!=0) blocksize = LCM(blocksize,Nx);
  if(blocksize%Ny!=0) blocksize = LCM(blocksize,Ny);
  
  /* first ajust the dimension to be multiple of blocksize */
  out_width =  (InWidth+(blocksize)-1)/blocksize*blocksize;
  out_height =  (InHeight+(blocksize)-1)/blocksize*blocksize;
  if ((mask = (UChar *)malloc(sizeof(UChar)*out_width*out_height)) == NULL) {
    return(DWT_MEMORY_FAILED);
  }
  memset(mask, (Char )0, sizeof(UChar)*out_width*out_height);

  /* fill out data */
  for(i=0, j=0; i< InHeight*out_width;
      i+=out_width, j+=InWidth) {
    f = InMask+j+InWidth;
    for(a = InMask+j, b=mask+i; a < f; a++, b++) {
      if(*a == (UChar) DWT_IN) *b = DWT_IN;
    }
  }
  *OutWidth = out_width;
  *OutHeight = out_height;
  *OutMask = mask;
  return(DWT_OK);
}


/* Function: PutBox()
   Description: put the bounding box of the image object back
   Input:
   
   InImage -- Input image data, data type defined by DataType;
   InMask -- Input image mask
   RealWidth, RealHeight  -- the size of the actual image;
   DataType -- 0 - UChar 1- UShort for InImage and OutImage
   Shape   -- if -1, the SHAPE is rectangular, else arbitary shape and
              Shape defines the mask value of an object, useful for
	      multiple objects coding 

   VirtualWidth, VirtualHeight -- size of the output image
   OriginX, OriginY -- origins of the output image relative to the original
                       image

   Output:
   
   OutImage -- Output image contains the bounding box image
   OutMask -- Output image mask
              NULL if Shape == RECTANGULAR;
		       
   Return:  DWT_OK if no error;	       
*/

Int VTCIMAGEBOX:: PutBox(Void *InImage, UChar *InMask, Void *OutImage, UChar *OutMask, 
	   Int RealWidth, Int RealHeight, 
	   Int VirtualWidth, Int VirtualHeight, 
	   Int OriginX, Int OriginY, Int DataType, Int Shape)
{
  Int origin_x, origin_y;
  Int virtual_width, virtual_height;
  UChar *data, *indata;
  UChar *mask;
  Int wordsize = (DataType==DWT_USHORT_ENUM)?2:1;
  Int i, j;
  Int real_width, real_height; 
  Int max_x, max_y;
  Int rows, cols;
  UChar *a, *b, *c, *f;

  real_width = RealWidth;
  real_height = RealHeight;
  virtual_width = VirtualWidth;
  virtual_height = VirtualHeight;
  origin_x = OriginX;
  origin_y = OriginY;

  /* allocate proper memory and initialize to zero*/
  data = (UChar *)OutImage;
  memset(data, (Char )0, sizeof(UChar)*real_width*real_height*wordsize);
  if(Shape != RECTANGULAR) {
    mask = OutMask;
    memset(mask, (Char)0, sizeof(UChar)*real_width*real_height);
  }
      
  /* calculate clip area */
  max_y = origin_y+virtual_height;
  max_y = (max_y<real_height)?max_y:real_height;
  rows = max_y - origin_y;
  max_x = origin_x+virtual_width;
  max_x = (max_x<real_width)?max_x:real_width;
  cols = max_x - origin_x;
  indata = (UChar *)InImage;
  /* fill out data */
  for(i=0, j=origin_y*real_width+origin_x; i< rows*virtual_width;
      i+=virtual_width, j+=real_width) {
    f = InMask+i+cols;
    for(a = data +j*wordsize, b = indata + i*wordsize, c= InMask+i;  
	c< f; c++, a+=wordsize, b+=wordsize) {
      if(*c == DWT_IN) {
	memcpy(a, b, wordsize);
      }
    }
    if(Shape != RECTANGULAR) {
      for(a=InMask+i, b = mask+j; a<f; a++, b++) {
	if(*a == DWT_IN) *b=(UChar) Shape;
      }
    }
  }
  return(DWT_OK);
}


/* find the least common multiples of two Integers */
Int VTCIMAGEBOX:: LCM(Int x, Int y)
{
  return(x*y/GCD(x,y));
}
/* find the greatest common divisor of two Integers */
Int VTCIMAGEBOX:: GCD(Int x, Int y)
{
  Int i;
  Int k;
  Int d=x<y?x:y; /* the lesser of x and y */
  d = (Int) sqrt((double)d)+1;
  k = 1;
  for(i=d;i>1;i--) {
    if(x%i==0 && y%i==0) {
      k=i;
      break;
    }
  }
  return(k);
}

/* Function: SubsampleMask()
   Description: Subsample the Mask;
   
   Input:
   InMask -- Input mask;
   Nx -- Horizontal subsampling rate;
   Ny -- vertical subsampling rate;
   Shape -- Integer number specify the object in a mask;

   Output:
   OutMask -- Output mask, memory space provided by caller function;

   return: DWT_OK if no error;
*/

Void  VTCIMAGEBOX:: SubsampleMask(UChar *InMask, UChar **OutMask, 
		    Int Width, Int Height,
		    FILTER *filter)
{
  UChar *a, *b;
  Int width, height;
  Int i,j, k;
  
  width = (Width >>1);
  height = (Height >>1);
  a = (UChar *)malloc(Width*Height*sizeof(UChar));
  b = (UChar *)malloc(width*height*sizeof(UChar));
  if(a == NULL || b == NULL) 
    exit(printf("Error allocation memory\n"));
 // ret=do_DWTMask(InMask, a, Width, Height, 1, &filter);
//  if(ret!=DWT_OK) 
//    exit(printf("DWT error code = %d\n", ret));
  for(i=0,j=0, k=0; i< height; i++,j+=Width, k+=width){
    memcpy(b+k, a+j, width);
  }
  free(a);
  *OutMask = b;
}