t1aaset.c

source code: Covert TXT to PDF

    }
    /* restore level */
    T1aa_level=savelevel;
    return(&aastring_glyph);
  }
  

  /* Set some looping parameters for subsampling */
  if (lsb<0){
    aalsb=lsb/T1aa_level-1;
    aahstart=T1aa_level+(lsb%T1aa_level);
  }
  else{
    aalsb=lsb/T1aa_level;
    aahstart=lsb%T1aa_level;
  }
  
  /* The horizontal number of steps: */
  n_horz=(wd+aahstart+T1aa_level-1)/T1aa_level;
  /* And the padded value */
  n_horz_pad=PAD( n_horz*T1aa_bpp, pFontBase->bitmap_pad )>>3;

  /* vertical number of steps: */
  if (asc % T1aa_level){ /* not aligned */
    if ( asc > 0){
      n_asc=asc/T1aa_level+1;
      v_start=asc % T1aa_level;
    }
    else{
      n_asc=asc/T1aa_level;
      v_start=T1aa_level + (asc % T1aa_level); 
    }
  }
  else{
    n_asc=asc/T1aa_level;
    v_start=T1aa_level;
  }
  if (dsc % T1aa_level){ /* not aligned */
    if ( dsc < 0){
      n_dsc=dsc/T1aa_level-1;
      v_end=-(dsc % T1aa_level);
    }
    else{
      n_dsc=dsc/T1aa_level;
      v_end=T1aa_level - (dsc % T1aa_level);
    }
  }
  else{
    n_dsc=dsc/T1aa_level;
    v_end=T1aa_level;
  }
  /* the total number of lines: */
  n_vert=n_asc-n_dsc;
  
  /* Allocate memory for glyph */
  memsize = n_horz_pad*n_vert;

  /* Note: we allocate 12 bytes more than necessary */ 
  aastring_glyph.bits = (char *)malloc(memsize*sizeof( char) +12);
  if (aastring_glyph.bits == NULL) {
    T1_errno=T1ERR_ALLOC_MEM;
    return(NULL);
  }
  
  paddedW=PAD(wd,pFontBase->bitmap_pad)/8;
  offset=0;
  target_ptr=aastring_glyph.bits;
  
  /* We must check for n_vert==1 because the computation above is not
     valid in this case */
  if (n_vert==1)
    v_start=v_start < v_end ? v_start : v_end;
  
  ptr = glyph->bits;
  for (i = 0; i < n_vert; i++) {
    if (i==0)
      y=v_start;
    else if (i==n_vert-1)
      y=v_end;
    else
      y=T1aa_level;
    T1_AADoLine ( T1aa_level, wd, y, paddedW, ptr, target_ptr, aahstart );
    ptr += y * paddedW;
    target_ptr += n_horz_pad;
  }
  
  /* .. and set them in aastring_glyph */
  aastring_glyph.metrics.leftSideBearing=aalsb;
  aastring_glyph.metrics.rightSideBearing=aalsb + n_horz;
  aastring_glyph.metrics.advanceX=(int) floor(glyph->metrics.advanceX/(float)T1aa_level+0.5);
  aastring_glyph.metrics.advanceY=(int) floor(glyph->metrics.advanceY/(float)T1aa_level+0.5);
  aastring_glyph.metrics.ascent=n_asc;
  aastring_glyph.metrics.descent=n_dsc;
  aastring_glyph.pFontCacheInfo=NULL;

  /* restore level */
  T1aa_level=savelevel;

  return(&aastring_glyph);
}



/* T1_AASetGrayValues(): Sets the byte values that are put into the
   pixel position for the respective entries:
   Returns 0 if successfull.
   */
int T1_AASetGrayValues(unsigned long white,
		       unsigned long gray75,
		       unsigned long gray50,
		       unsigned long gray25,
		       unsigned long black)
{
  
  if (CheckForInit()){
    T1_errno=T1ERR_OP_NOT_PERMITTED;
    return(-1);
  }
  
  gv[4]=(unsigned T1_AA_TYPE32)black;    /* black value */
  gv[3]=(unsigned T1_AA_TYPE32)gray25;   /* gray 25% value */
  gv[2]=(unsigned T1_AA_TYPE32)gray50;   /* gray 50% value */   
  gv[1]=(unsigned T1_AA_TYPE32)gray75;   /* gray 75% value */
  gv[0]=(unsigned T1_AA_TYPE32)white;    /* white value */
  
  T1aa_bg=white;
  
  if ((T1_AAInit( T1_AA_LOW)))
    return(-1);
  return(0);
  
}

		     

/* T1_AAHSetGrayValues(): Sets the byte values that are put into the
   pixel position for the respective entries (for 17 gray levels):
   Returns 0 if successfull.
   */
int T1_AAHSetGrayValues( unsigned long *grayvals)
{
  int i;
  
  if (CheckForInit()){
    T1_errno=T1ERR_OP_NOT_PERMITTED;
    return(-1);
  }

  /* 0==white(background) ... 16==black(foreground) */
  for (i=0; i<17; i++){
    gv_h[i]=(unsigned T1_AA_TYPE32)grayvals[i];
  }
  

  T1aa_bg=grayvals[0];
  
  if ((T1_AAInit( T1_AA_HIGH)))
    return(-1);
  return(0);
  
}



/* T1_AANSetGrayValues(): Sets the byte values that are put into the
   pixel position for the respective entries (for 2 gray levels):
   Returns 0 if successfull. This is for the case the non-antialiased
   "bytemaps" should be generated.
   */
int T1_AANSetGrayValues( unsigned long bg, unsigned long fg)
{
  
  if (CheckForInit()){
    T1_errno=T1ERR_OP_NOT_PERMITTED;
    return(-1);
  }

  gv_n[0]=bg;
  gv_n[1]=fg;
  
  T1aa_bg=bg;
  
  if ((T1_AAInit( T1_AA_NONE)))
    return(-1);
  return(0);
  
}



/* Get the current setting of graylevels for 2x antialiasing. The 5
   values are stored at address pgrayvals in order from background to
   foreground */
int T1_AAGetGrayValues( long *pgrayvals)  
{
  int i;
  
  if (CheckForInit()) {
    T1_errno=T1ERR_OP_NOT_PERMITTED;
    return(-1);
  }

  if (pgrayvals==NULL) {
    T1_errno=T1ERR_INVALID_PARAMETER;
    return(-1);
  }
  
  for ( i=0; i<5; i++) { /* bg (i=0)  to fg (i=4) */
    pgrayvals[i]=gv[i];
  }
  return( 0);
  
}



/* Get the current setting of graylevels for 2x antialiasing. The 17
   values are stored at address pgrayvals in order from background to
   foreground */
int T1_AAHGetGrayValues( long *pgrayvals) 
{
  int i;

  if (CheckForInit()) {
    T1_errno=T1ERR_OP_NOT_PERMITTED;
    return(-1);
  }

  if (pgrayvals==NULL) {
    T1_errno=T1ERR_INVALID_PARAMETER;
    return(-1);
  }

  for ( i=0; i<17; i++) { /* bg (i=0)  to fg (i=16) */
    pgrayvals[i]=gv[i];
  }
  return( 0);
}



/* Get the current setting of graylevels for 2x antialiasing. The 2
   values are stored at address pgrayvals in order from background to
   foreground */
int T1_AANGetGrayValues( long *pgrayvals) 
{

  if (CheckForInit()) {
    T1_errno=T1ERR_OP_NOT_PERMITTED;
    return(-1);
  }

  if (pgrayvals==NULL) {
    T1_errno=T1ERR_INVALID_PARAMETER;
    return(-1);
  }
  pgrayvals[0]=gv[0]; /* background */
  pgrayvals[1]=gv[1]; /* foreground */
  return( 0);
}


/* T1_AASetBitsPerPixel(): Sets the depths of the antialiased glyph
   pixel. Returns 0 if bpp is valid and -1 otherwise. If 24 is
   specified, meaning to be the depth rather than the bpp-value,
   automatically 32 bpp is chosen. */
int  T1_AASetBitsPerPixel( int bpp)
{
  
  if (CheckForInit()){
    T1_errno=T1ERR_OP_NOT_PERMITTED;
    return(-1);
  }
  

  /* T1aa_level = 0; */

  if (bpp==8){
    T1aa_bpp=8;
    return(0);
  }
  if (bpp==16){
    T1aa_bpp=16;
    return(0);
  }
  if ((bpp==32)|(bpp==24)){
    T1aa_bpp=32;
    return(0);
  }

  T1_errno=T1ERR_INVALID_PARAMETER;
  return(-1);
}


/* T1_AAGetBitsPerPixel(): Return the number of bits per pixel set in
   t1lib. 
*/
int T1_AAGetBitsPerPixel( void)
{
  return( T1aa_bpp);
  
}


/* Set the Subsampling level for subsequent operations: */
int T1_AASetLevel( int level)
{
  
   if (CheckForInit()){
     T1_errno=T1ERR_OP_NOT_PERMITTED;
     return(-1);
   }

   if (level==T1_AA_LOW){
     T1aa_level=T1_AA_LOW;
     return(0);
   }
   else if (level==T1_AA_HIGH){
     T1aa_level=T1_AA_HIGH;
     return(0);
   }
   else if (level==T1_AA_NONE){
     T1aa_level=T1_AA_NONE;
     return(0);
   }
   
   T1_errno=T1ERR_INVALID_PARAMETER;
   return(-1);
   
}


/* Get the current subsampling level */
int T1_AAGetLevel( void)
{
  return( T1aa_level);
}


/* T1_AAFillOutline(): Create a filled glyph from an outline description */
GLYPH *T1_AAFillOutline( T1_OUTLINE *path, int modflag)
{
  
  GLYPH *glyph;   /* pointer to bitmap glyph */
  static GLYPH aaglyph={NULL,{0,0,0,0,0,0},NULL,DEFAULTBPP};/* The anti-aliased glyph */
  long asc, dsc, ht, wd;
  long i;
  long n_horz, n_horz_pad, n_vert, n_asc, n_dsc;
  long v_start, v_end;
  char *target_ptr;
  long offset;
  char *ptr;
  int y;
  long lsb, aalsb, aahstart;
  int memsize;
  LONG paddedW;
 

  /* Reset character glyph, if necessary */
  if (aaglyph.bits!=NULL){
    free(aaglyph.bits);
    aaglyph.bits=NULL;
  }
  aaglyph.metrics.leftSideBearing=0;
  aaglyph.metrics.rightSideBearing=0;
  aaglyph.metrics.advanceX=0;
  aaglyph.metrics.advanceY=0;
  aaglyph.metrics.ascent=0;
  aaglyph.metrics.descent=0;
  aaglyph.pFontCacheInfo=NULL;
  aaglyph.bpp=T1aa_bpp;


  /* First, scale outline appropriately: */
  path=T1_ScaleOutline( path, T1aa_level);
  
  /* Second, call routine to fill outline, all error checking is
     done in this function: */ 
  if ((glyph=T1_FillOutline( path, modflag))==NULL)
    return(NULL); /* An error occured */
  
  /* In case there are no black pixels, we simply set the dimensions and
     then return */
  if ( glyph->bits == NULL) {
    aaglyph.bits=NULL;
    aaglyph.metrics.leftSideBearing=0;
    aaglyph.metrics.rightSideBearing=0;
    aaglyph.metrics.advanceX=(int) floor(glyph->metrics.advanceX/(float)T1aa_level+0.5);
    aaglyph.metrics.advanceY=(int) floor(glyph->metrics.advanceY/(float)T1aa_level+0.5);
    aaglyph.metrics.ascent=0;
    aaglyph.metrics.descent=0;
    aaglyph.pFontCacheInfo=NULL;
    return(&aaglyph);
  }

  /* Get dimensions of bitmap: */
  asc=glyph->metrics.ascent;
  dsc=glyph->metrics.descent;
  lsb=glyph->metrics.leftSideBearing;
  ht=asc-dsc;
  wd=glyph->metrics.rightSideBearing-lsb;
  

  if (T1aa_level==T1_AA_NONE){
    /* we only convert bitmap to bytemap */
    aaglyph=*glyph;
    aaglyph.bpp=T1aa_bpp;
    /* Compute scanline length and such */
    n_horz_pad=PAD( wd*T1aa_bpp, pFontBase->bitmap_pad )>>3;
    /* Allocate memory for glyph, we alloc 12 bytes more to simplify
       subsampling! */
    memsize = n_horz_pad*ht*8;
    aaglyph.bits = (char *)malloc(memsize*sizeof( char) +12);
    if (aaglyph.bits == NULL) {
      T1_errno=T1ERR_ALLOC_MEM;
      return(NULL);
    }
    paddedW=PAD(wd,pFontBase->bitmap_pad)>>3;
    ptr=glyph->bits;
    target_ptr=aaglyph.bits;
    for (i = 0; i < ht; i++) {
      T1_DoLine ( wd, paddedW, ptr, target_ptr );
      ptr += paddedW;
      target_ptr += n_horz_pad;
    }
    return(&aaglyph);
  }
  

  /* Set some looping parameters for subsampling */
  if (lsb<0){
    aalsb=lsb/T1aa_level-1;
    aahstart=T1aa_level+(lsb%T1aa_level);
  }
  else{
    aalsb=lsb/T1aa_level;
    aahstart=lsb%T1aa_level;
  }
  
  /* The horizontal number of steps: */
  n_horz=(wd+aahstart+T1aa_level-1)/T1aa_level;
  /* And the padded value */
  n_horz_pad=PAD( n_horz*T1aa_bpp, pFontBase->bitmap_pad )>>3;
  
  /* vertical number of steps: */
  if (asc % T1aa_level){ /* not aligned */
    if ( asc > 0){
      n_asc=asc/T1aa_level+1;
      v_start=asc % T1aa_level;
    }
    else{
      n_asc=asc/T1aa_level;
      v_start=T1aa_level + (asc % T1aa_level); 
    }
  }
  else{
    n_asc=asc/T1aa_level;
    v_start=T1aa_level;
  }
  if (dsc % T1aa_level){ /* not aligned */
    if ( dsc < 0){
      n_dsc=dsc/T1aa_level-1;
      v_end=-(dsc % T1aa_level);
    }
    else{
      n_dsc=dsc/T1aa_level;
      v_end=T1aa_level - (dsc % T1aa_level);
    }
  }
  else{
    n_dsc=dsc/T1aa_level;
    v_end=T1aa_level;
  }
  /* the total number of lines: */
  n_vert=n_asc-n_dsc;
  
  /* Allocate memory for glyph */
  memsize = n_horz_pad*n_vert;
  
  aaglyph.bits = (char *)malloc(memsize*sizeof( char)+12);
  if (aaglyph.bits == NULL) {
    T1_errno=T1ERR_ALLOC_MEM;
    return(NULL);
  }
  
  paddedW=PAD(wd,pFontBase->bitmap_pad)/8;
  offset=0;
  target_ptr=aaglyph.bits;
  
  /* We must check for n_vert==1 because the computation above is not
     valid in this case */
  if (n_vert==1)
    v_start=v_start < v_end ? v_start : v_end;

  ptr = glyph->bits;
  for (i = 0; i < n_vert; i++) {
    if (i==0)
      y=v_start;
    else if (i==n_vert-1)
      y=v_end;
    else
      y=T1aa_level;
    T1_AADoLine ( T1aa_level, wd, y, paddedW, ptr, target_ptr, aahstart );
    ptr += y * paddedW;
    target_ptr += n_horz_pad;
  }
  
  /* .. and set them in aaglyph */
  aaglyph.metrics.leftSideBearing=aalsb;
  aaglyph.metrics.rightSideBearing=aalsb + n_horz;
  aaglyph.metrics.advanceX=(int) floor(glyph->metrics.advanceX/(float)T1aa_level+0.5);
  aaglyph.metrics.advanceY=(int) floor(glyph->metrics.advanceY/(float)T1aa_level+0.5);
  aaglyph.metrics.ascent=n_asc;
  aaglyph.metrics.descent=n_dsc;
  aaglyph.pFontCacheInfo=NULL;

  return(&aaglyph);
}



/* T1_AASetSmartLimits(): Set the limit-values for smart
   antialiasing. Returns 0 if OK, and -1 else. */
int T1_AASetSmartLimits( float limit1, float limit2)
{

  if (limit1 > 0.0 && limit2 > 0.0 && limit2 >= limit2) {
    T1aa_smartlimit1=limit1;
    T1aa_smartlimit2=limit2;
    return( 0);
  }
  else{
    T1_errno=T1ERR_INVALID_PARAMETER;
    return( -1);
  }
}



/* T1_AASetSmartMode(): Enable or disable smart anialiasing */
int T1_AASetSmartMode( int smart)
{

  if (smart==T1_YES) {
    T1aa_SmartOn=1;
  }
  else if (smart==T1_NO) {
    T1aa_SmartOn=0;
  }
  else {
    T1_errno=T1ERR_INVALID_PARAMETER;
    return( -1);
  }
  return( 0);
}