type1.c

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  ClearStack();
  ClearPSFakeStack();
  ClearCallStack();
 
  FinitStems();
  InitStems();
 
  for (;;) {
    if (!DoRead(&Code)) break;
    Decode(Code);
    if (errflag) return;
  }
  path = Join(mypath, path);
}
 
 
/* |- sbx sby wx wy SBW |- */
/* Set the left sidebearing point to (sbx,sby), */
/* set the character width vector to (wx,wy). */
static Sbw(sbx, sby, wx, wy)
  double sbx, sby, wx, wy;
{
  IfTrace4((FontDebug), "SBW %f %f %f %f\n", &sbx, &sby, &wx, &wy);
 
  escapementX = wx; /* Character width vector */
  escapementY = wy;
 
  /* Sidebearing values are sbx, sby args, plus accent offset from Seac(). */
  sidebearingX = sbx + accentoffsetX;
  sidebearingY = sby + accentoffsetY;
 
  path = Join(path, Loc(CharSpace, sidebearingX, sidebearingY));
  if (ProcessHints) {currx = sidebearingX; curry = sidebearingY;}
}
 
 /* num1 num2 DIV quotient */
/* Behaves like DIV in the PostScript language */
static double Div(num1, num2)
  double num1, num2;
{
  IfTrace2((FontDebug), "Div %f %f\n", &num1, &num2);
  return(num1 / num2);
}
 
/*
  The following four subroutines (FlxProc, FlxProc1, FlxProc2, and
  HintReplace) are C versions of the OtherSubrs Programs, which were
  were published in the Adobe Type 1 Font Format book.
 
  The Flex outline fragment is described by
    c1: (x0, y0) = c3: (x0, yshrink(y0)) or (xshrink(x0), y0)
     "  (x1, y1) =  "  (x1, yshrink(y1)) or (xshrink(x1), y1)
     "  (x2, y2) - reference point
    c2: (x0, y0) = c4: (x0, yshrink(y0)) or (xshrink(x0), y0)
     "  (x1, y1) =  "  (x1, yshrink(y1)) or (xshrink(x1), y1)
     "  (x2, y2) =  "  (x2, y2), rightmost endpoint
    c3: (x0, y0) - control point, 1st Bezier curve
     "  (x1, y1) - control point,      -"-
     "  (x2, y2) - end point,          -"-
    c4: (x0, y0) - control point, 2nd Bezier curve
     "  (x1, y1) - control point,      -"-
     "  (x2, y2) - end point,          -"-
    ep: (epY, epX) - final endpoint (should be same as c4: (x2, y2))
    idmin - minimum Flex height (1/100 pixel) at which to render curves
*/
 
#define dtransform(dxusr,dyusr,dxdev,dydev) { \
  register struct segment *point = Loc(CharSpace, dxusr, dyusr); \
  QueryLoc(point, IDENTITY, dxdev, dydev); \
  Destroy(point); \
}
 
#define itransform(xdev,ydev,xusr,yusr) { \
  register struct segment *point = Loc(IDENTITY, xdev, ydev); \
  QueryLoc(point, CharSpace, xusr, yusr); \
  Destroy(point); \
}
 
#define transform(xusr,yusr,xdev,ydev) dtransform(xusr,yusr,xdev,ydev)
 
#define PaintType (0)
 
#define lineto(x,y) { \
  struct segment *CurrentPoint; \
  double CurrentX, CurrentY; \
  CurrentPoint = Phantom(path); \
  QueryLoc(CurrentPoint, CharSpace, &CurrentX, &CurrentY); \
  Destroy(CurrentPoint); \
  RLineTo(x - CurrentX, y - CurrentY); \
}
 
#define curveto(x0,y0,x1,y1,x2,y2) { \
  struct segment *CurrentPoint; \
  double CurrentX, CurrentY; \
  CurrentPoint = Phantom(path); \
  QueryLoc(CurrentPoint, CharSpace, &CurrentX, &CurrentY); \
  Destroy(CurrentPoint); \
  RRCurveTo(x0 - CurrentX, y0 - CurrentY, x1 - x0, y1 - y0, x2 - x1, y2 - y1); \
}
 
#define xshrink(x) ((x - c4x2) * shrink +c4x2)
#define yshrink(y) ((y - c4y2) * shrink +c4y2)
 
#define PickCoords(flag) \
  if (flag) { /* Pick "shrunk" coordinates */ \
    x0 = c1x0; y0 = c1y0; \
    x1 = c1x1; y1 = c1y1; \
    x2 = c1x2; y2 = c1y2; \
    x3 = c2x0; y3 = c2y0; \
    x4 = c2x1; y4 = c2y1; \
    x5 = c2x2; y5 = c2y2; \
  } else { /* Pick original coordinates */ \
    x0 = c3x0; y0 = c3y0; \
    x1 = c3x1; y1 = c3y1; \
    x2 = c3x2; y2 = c3y2; \
    x3 = c4x0; y3 = c4y0; \
    x4 = c4x1; y4 = c4y1; \
    x5 = c4x2; y5 = c4y2; \
  }
 
/* FlxProc() = OtherSubrs[0]; Main part of Flex          */
/*   Calling sequence: 'idmin epX epY 3 0 callothersubr' */
/*   Computes Flex values, and renders the Flex path,    */
/*   and returns (leaves) ending coordinates on stack    */
static void FlxProc(c1x2, c1y2, c3x0, c3y0, c3x1, c3y1, c3x2, c3y2,
             c4x0, c4y0, c4x1, c4y1, c4x2, c4y2, epY, epX, idmin)
  double c1x2, c1y2;
  double c3x0, c3y0, c3x1, c3y1, c3x2, c3y2;
  double c4x0, c4y0, c4x1, c4y1, c4x2, c4y2;
  double epX, epY;
  int idmin;
{
  double dmin;
  double c1x0, c1y0, c1x1, c1y1;
  double c2x0, c2y0, c2x1, c2y1, c2x2, c2y2;
  char yflag;
  double x0, y0, x1, y1, x2, y2, x3, y3, x4, y4, x5, y5;
  double cxx, cyx, cxy, cyy; /* Transformation matrix */
  int flipXY;
  double x, y;
  double erosion = 1; /* Device parameter */
    /* Erosion may have different value specified in 'internaldict' */
  double shrink;
  double dX, dY;
  char erode;
  double eShift;
  double cx, cy;
  double ex, ey;
 
  Destroy(path);
  path = FlxOldPath; /* Restore previous path (stored in FlxProc1) */
 
  if (ProcessHints) {
    dmin = ABS(idmin) / 100.0; /* Minimum Flex height in pixels */
 
    c2x2 = c4x2; c2y2 = c4y2; /* Point c2 = c4 */
 
    yflag = FABS(c1y2 - c3y2) > FABS(c1x2 - c3x2); /* Flex horizontal? */
 
    QuerySpace(CharSpace, &cxx, &cyx, &cxy, &cyy); /* Transformation matrix */
 
    if (FABS(cxx) < 0.00001 || FABS(cyy) < 0.00001)
      flipXY = -1; /* Char on side */
    else if (FABS(cyx) < 0.00001 || FABS(cxy) < 0.00001)
      flipXY = 1; /* Char upright */
    else
      flipXY = 0; /* Char at angle */
 
    if (yflag) { /* Flex horizontal */
      if (flipXY == 0 || c3y2 == c4y2) { /* Char at angle or Flex height = 0 */
        PickCoords(FALSE); /* Pick original control points */
      } else {
        shrink = FABS((c1y2 - c4y2) / (c3y2 - c4y2)); /* Slope */
 
        c1x0 = c3x0; c1y0 = yshrink(c3y0);
        c1x1 = c3x1; c1y1 = yshrink(c3y1);
        c2x0 = c4x0; c2y0 = yshrink(c4y0);
        c2x1 = c4x1; c2y1 = yshrink(c4y1);
 
        dtransform(0.0, ROUND(c3y2-c1y2), &x, &y); /* Flex height in pixels */
        dY = FABS((flipXY == 1) ? y : x);
        PickCoords(dY < dmin); /* If Flex small, pick 'shrunk' control points */
 
        if (FABS(y2 - c1y2) > 0.001) { /* Flex 'non-zero'? */
          transform(c1x2, c1y2, &x, &y);
 
          if (flipXY == 1) {
            cx = x; cy = y;
          } else {
            cx = y; cy = x;
          }
 
          dtransform(0.0, ROUND(y2-c1y2), &x, &y);
          dY = (flipXY == 1) ? y : x;
          if (ROUND(dY) != 0)
            dY = ROUND(dY);
          else
            dY = (dY < 0) ? -1 : 1;
 
          erode = PaintType != 2 && erosion >= 0.5;
          if (erode)
            cy -= 0.5;
          ey = cy + dY;
          ey = CEIL(ey) - ey + FLOOR(ey);
          if (erode)
            ey += 0.5;
 
          if (flipXY == 1) {
            itransform(cx, ey, &x, &y);
          } else {
            itransform(ey, cx, &x, &y);
          }
 
          eShift = y - y2;
          y1 += eShift;
          y2 += eShift;
          y3 += eShift;
        }
      }
    } else { /* Flex vertical */
      if (flipXY == 0 || c3x2 == c4x2) { /* Char at angle or Flex height = 0 */
        PickCoords(FALSE); /* Pick original control points */
      } else {
        shrink = FABS((c1x2 - c4x2) / (c3x2 - c4x2)); /* Slope */
 
        c1x0 = xshrink(c3x0); c1y0 = c3y0;
        c1x1 = xshrink(c3x1); c1y1 = c3y1;
        c2x0 = xshrink(c4x0); c2y0 = c4y0;
        c2x1 = xshrink(c4x1); c2y1 = c4y1;
 
        dtransform(ROUND(c3x2 - c1x2), 0.0, &x, &y); /* Flex height in pixels */
        dX = FABS((flipXY == -1) ? y : x);
        PickCoords(dX < dmin); /* If Flex small, pick 'shrunk' control points */
 
        if (FABS(x2 - c1x2) > 0.001) {
          transform(c1x2, c1y2, &x, &y);
          if (flipXY == -1) {
            cx = y; cy = x;
          } else {
            cx = x; cy = y;
          }
 
          dtransform(ROUND(x2-c1x2), 0.0, &x, &y);
          dX = (flipXY == -1) ? y : x;
          if (ROUND(dX) != 0)
            dX = ROUND(dX);
          else
            dX = (dX < 0) ? -1 : 1;
 
          erode = PaintType != 2 && erosion >= 0.5;
          if (erode)
            cx -= 0.5;
          ex = cx + dX;
          ex = CEIL(ex) - ex + FLOOR(ex);
          if (erode)
            ex += 0.5;
 
          if (flipXY == -1) {
            itransform(cy, ex, &x, &y);
          } else {
            itransform(ex, cy, &x, &y);
          }
 
          eShift = x - x2;
          x1 += eShift;
          x2 += eShift;
          x3 += eShift;
        }
      }
    }
 
    if (x2 == x5 || y2 == y5) {
      lineto(x5, y5);
    } else {
      curveto(x0, y0, x1, y1, x2, y2);
      curveto(x3, y3, x4, y4, x5, y5);
    }
  } else { /* ProcessHints is off */
    PickCoords(FALSE); /* Pick original control points */
    curveto(x0, y0, x1, y1, x2, y2);
    curveto(x3, y3, x4, y4, x5, y5);
  }
 
  PSFakePush(epY);
  PSFakePush(epX);
}
 
/* FlxProc1() = OtherSubrs[1]; Part of Flex            */
/*   Calling sequence: '0 1 callothersubr'             */
/*   Saves and clears path, then restores currentpoint */
static void FlxProc1()
{
  struct segment *CurrentPoint;
 
  CurrentPoint = Phantom(path);
 
  FlxOldPath = path;
  path = CurrentPoint;
}
 
/* FlxProc2() = OtherSubrs[2]; Part of Flex */
/*   Calling sequence: '0 2 callothersubr'  */
/*   Returns currentpoint on stack          */
static void FlxProc2()
{
  struct segment *CurrentPoint;
  double CurrentX, CurrentY;
 
  CurrentPoint = Phantom(path);
  QueryLoc(CurrentPoint, CharSpace, &CurrentX, &CurrentY);
  Destroy(CurrentPoint);
 
  /* Push CurrentPoint on fake PostScript stack */
  PSFakePush(CurrentX);
  PSFakePush(CurrentY);
}
 
/* HintReplace() = OtherSubrs[3]; Hint Replacement            */
/*   Calling sequence: 'subr# 1 3 callothersubr pop callsubr' */
/*   Reinitializes stem hint structure                        */
static void HintReplace()
{
  /* Effectively retire the current stems, but keep them around for */
  /* revhint use in case we are in a stem when we replace hints. */
  currstartstem = numstems;
 
  /* 'subr#' is left on PostScript stack (for 'pop callsubr') */
}
 
/* arg1 ... argn n othersubr# CALLOTHERSUBR - */
/* Make calls on the PostScript interpreter (or call equivalent C code) */
/* NOTE: The n arguments have been pushed on the fake PostScript stack */
static CallOtherSubr(othersubrno)
  int othersubrno;
{
  IfTrace1((FontDebug), "CallOtherSubr %d\n", othersubrno);
 
  switch(othersubrno) {
    case 0: /* OtherSubrs[0]; Main part of Flex */
      if (PSFakeTop < 16) Error0("CallOtherSubr: PSFakeStack low");
      ClearPSFakeStack();
      FlxProc(
        PSFakeStack[0],  PSFakeStack[1],  PSFakeStack[2],  PSFakeStack[3],
        PSFakeStack[4],  PSFakeStack[5],  PSFakeStack[6],  PSFakeStack[7],
        PSFakeStack[8],  PSFakeStack[9],  PSFakeStack[10], PSFakeStack[11],
        PSFakeStack[12], PSFakeStack[13], PSFakeStack[14], PSFakeStack[15],
        (int) PSFakeStack[16]
      );
      break;
    case 1: /* OtherSubrs[1]; Part of Flex */
      FlxProc1();
      break;
    case 2: /* OtherSubrs[2]; Part of Flex */
      FlxProc2();
      break;
    case 3: /* OtherSubrs[3]; Hint Replacement */
      HintReplace();
      break;
    default: { /* call OtherSubrs[4] or higher if PostScript is present */
    }
  }
}
 
/* |- x y SETCURRENTPOINT |- */
/* Sets the current point to (x,y) in absolute */
/* character space coordinates without per- */
/* forming a CharString MOVETO command */
static SetCurrentPoint(x, y)
  double x, y;
{
  IfTrace2((FontDebug), "SetCurrentPoint %f %f\n", &x, &y);
 
  currx = x;
  curry = y;
}
 
/* The Type1Char routine for use by PostScript. */
/************************************************/
struct xobject *Type1Char(env, S, charstrP, subrsP, osubrsP, bluesP, modeP)
  char *env;
  struct XYspace *S;
  psobj *charstrP;
  psobj *subrsP;
  psobj *osubrsP;
  struct blues_struct *bluesP;  /* FontID's ptr to the blues struct */
  int *modeP;
{
  int Code;
 
  path = NULL;
  errflag = FALSE;
 
  /* Make parameters available to all Type1 routines */
  Environment = env;
  CharSpace = S; /* used when creating path elements */
  CharStringP = charstrP;
  SubrsP = subrsP;
  OtherSubrsP = osubrsP;
  ModeP = modeP;
 
    blues = bluesP;
 
  /* compute the alignment zones */
  ComputeAlignmentZones();
 
  StartDecrypt();
 
  ClearStack();
  ClearPSFakeStack();
  ClearCallStack();
 
  InitStems();
 
  currx = curry = 0;
  escapementX = escapementY = 0;
  sidebearingX = sidebearingY = 0;
  accentoffsetX = accentoffsetY = 0;
  wsoffsetX = wsoffsetY = 0;           /* No shift to preserve whitspace. */
  wsset = 0;                           /* wsoffsetX,Y haven't been set yet. */
 
  for (;;) {
    if (!DoRead(&Code)) break;
    Decode(Code);
    if (errflag) break;
  }
 
  FinitStems();
 
 
  /* Clean up if an error has occurred */
  if (errflag) {
    if (path != NULL) {
      Destroy(path); /* Reclaim storage */
      path = NULL;   /* Indicate that character could not be built */
    }
  }
 
  return((struct xobject *) path);
}