/// <summary>
/// read fitting output
/// </summary>
/// <param name="tx">glyph translator</param>
public static void ReadOutput(this GlyphFitOutline glyphOutline, IGlyphTranslator tx, float pxScale)
{
if (glyphOutline == null)
{
return;
}
//
//-----------------------------------------------------------
//create fit contour
//this version use only Agg's vertical hint only ****
//(ONLY vertical fitting , NOT apply horizontal fit)
//-----------------------------------------------------------
//create outline
//then create
List <GlyphContour> contours = glyphOutline.Contours;
int j = contours.Count;
tx.BeginRead(j);
for (int i = 0; i < j; ++i)
{
//new contour
CreateFitShape(tx, contours[i], pxScale, false, true, false);
tx.CloseContour();
}
tx.EndRead();
}
public override void ReadShapes(IGlyphTranslator tx)
{
//read output shape from dynamic outline
if (this.UseTrueTypeInstructions)
{
base.ReadShapes(tx);
return;
}
if (!TemporaryDisableCustomFit && this.UseVerticalHinting)
{
//read from our auto hint fitoutline
//need scale from original.
float toPixelScale = Typeface.CalculateScaleToPixel(RecentFontSizeInPixels);
if (toPixelScale < 0)
{
toPixelScale = 1;
}
_latestDynamicOutline.GenerateOutput(tx, toPixelScale);
}
else
{
base.ReadShapes(tx);
}
}
public virtual void ReadShapes(IGlyphTranslator tx)
{
//read output from glyph points
if (_cffGlyphData != null)
{
_cffEvalEngine.Run(tx, _ownerCff, _cffGlyphData, _recentPixelScale);
}
else
{
tx.Read(_outputGlyphPoints, _outputContours, _recentPixelScale);
}
}
void GenerateContourOutput(IGlyphTranslator tx, GlyphContour contour)
{
List <GlyphPoint> points = contour.flattenPoints;
int j = points.Count;
if (j == 0)
{
return;
}
//-------------------------------------------------
Bounds controlBounds = this.OriginalGlyphControlBounds;
//walk along the edge in the contour to generate new edge output
float pxscale = this._pxScale;
#if DEBUG
// dbugWriteLine("===begin===" + fit_x_offset);
// if (!dbugUseHorizontalFitValue)
// {
// fit_x_offset = 0;
// }
#endif
//-------------------------------------------------
//fineSubPixelRenderingOffset = 0.33f;
//-------------------------------------------------
//TODO: review here
float fit_x, fit_y;
points[0].GetFitXY(pxscale, out fit_x, out fit_y);
//
tx.MoveTo(fit_x, fit_y);
#if DEBUG
// dbugWriteOutput("M", fit_x, fit_x + fit_x_offset, fit_y);
#endif
//2. others
for (int i = 1; i < j; ++i)
{
//try to fit to grid
points[i].GetFitXY(pxscale, out fit_x, out fit_y);
tx.LineTo(fit_x, fit_y);
#if DEBUG
//for debug
//dbugWriteOutput("L", fit_x, fit_x + fit_x_offset, fit_y);
#endif
}
//close
tx.CloseContour();
#if DEBUG
//dbugWriteLine("===end===");
#endif
}
public void ReadShapes(IGlyphTranslator tx)
{
if (_useAutoHint)
{
//read from our auto hint fitoutline
//need scale from original.
_fitOutline.ReadOutput(tx, _recentPixelScale);
}
else
{
//read output from glyph points
tx.Read(this._outputGlyphPoints, this._outputContours, _recentPixelScale);
}
}
internal void Run(IGlyphTranslator tx, Cff1Font cff1Font, Type2GlyphInstructionList instructionList, float scale = 1)
{
//all fields are set to new values***
_cff1Font = cff1Font;
_scale = scale;
//-------------
//from Technical Note #5176 (CFF spec)
//resolve with bias
//Card16 bias;
//Card16 nSubrs = subrINDEX.count;
//if (CharstringType == 1)
// bias = 0;
//else if (nSubrs < 1240)
// bias = 107;
//else if (nSubrs < 33900)
// bias = 1131;
//else
// bias = 32768;
//find local subroutine
int nsubrs = cff1Font._localSubrs.Count;
_cffBias = (nsubrs < 1240) ? 107 :
(nsubrs < 33900) ? 1131 : 32769; //TODO: review 32769 or 32768
//
double currentX = 0, currentY = 0;
var scaleTx = new PxScaleGlyphTx(scale, tx);
//
scaleTx.BeginRead(0);//unknown contour count
//
Run(scaleTx, instructionList, ref currentX, ref currentY);
//
//
//some cff end without closing the latest contour?
if (scaleTx.IsContourOpened)
{
scaleTx.CloseContour();
}
scaleTx.EndRead();
}
/// <summary>
/// generate output with specific pixel scale
/// </summary>
/// <param name="tx"></param>
/// <param name="pxScale"></param>
public void GenerateOutput(IGlyphTranslator tx, float pxScale)
{
if (_contours == null)
{
return; //blank
}
#if DEBUG
this.EnableGridFit = dbugTestNewGridFitting;
#endif
if (_pxScale != pxScale)
{
//new scale need to adjust fit value again
_needAdjustGridFitValues = true;
}
//
this._pxScale = pxScale;
//
if (EnableGridFit)
{
if (_needRefreshBoneGroup)
{
//change scale not affect the grid fit ***
AnalyzeBoneGroups(GridBoxWidth, GridBoxHeight);
_needRefreshBoneGroup = false;
}
//
if (_needAdjustGridFitValues)
{
ReCalculateFittingValues();
_needAdjustGridFitValues = false;
}
}
if (tx != null)
{
List <GlyphContour> contours = this._contours;
int j = contours.Count;
tx.BeginRead(j);
for (int i = 0; i < j; ++i)
{
//generate in order of contour
GenerateContourOutput(tx, contours[i]);
}
tx.EndRead();
}
}
public override void ReadShapes(IGlyphTranslator tx)
{
if (this.UseTrueTypeInstructions)
{
base.ReadShapes(tx);
return;
}
if (this.UseVerticalHinting)
{
//read from our auto hint fitoutline
//need scale from original.
float toPixelScale = Typeface.CalculateToPixelScale(this.RecentFontSizeInPixels);
if (toPixelScale < 0)
{
toPixelScale = 1;
}
_fitOutline.ReadOutput(tx, toPixelScale);
}
else
{
base.ReadShapes(tx);
}
}
public PxScaleGlyphTx(float scale, IGlyphTranslator tx)
{
_scale = scale;
_tx = tx;
}
public virtual void ReadShapes(IGlyphTranslator tx)
{
//read output from glyph points
tx.Read(this._outputGlyphPoints, this._outputContours, _recentPixelScale);
}
public PxScaleGlyphTx(float scale, IGlyphTranslator tx)
{
this.scale = scale;
this.tx = tx;
}
//for TrueType Font
public static void Read(this IGlyphTranslator tx, GlyphPointF[] glyphPoints, ushort[] contourEndPoints, float scale = 1)
{
int startContour = 0;
int cpoint_index = 0;//current point index
int todoContourCount = contourEndPoints.Length;
//-----------------------------------
//1. start read data from a glyph
tx.BeginRead(todoContourCount);
//-----------------------------------
float latest_moveto_x = 0;
float latest_moveto_y = 0;
int curveControlPointCount = 0; // 1 curve control point => Quadratic, 2 curve control points => Cubic
while (todoContourCount > 0)
{
//reset
curveControlPointCount = 0;
//foreach contour...
//next contour will begin at...
int nextCntBeginAtIndex = contourEndPoints[startContour] + 1;
//reset ...
bool has_c_begin = false; //see below [A]
Vector2 c_begin = new Vector2(); //special point if the glyph starts with 'off-curve' control point
Vector2 c1 = new Vector2(); //control point of quadratic curve
//-------------------------------------------------------------------
bool offCurveMode = false;
bool foundFirstOnCurvePoint = false;
bool startWithOffCurve = false;
int cnt_point_count = 0;
//-------------------------------------------------------------------
//[A]
//first point may start with 'ON CURVE" or 'OFF-CURVE'
//1. if first point is 'ON-CURVE' => we just set moveto command to it
//
//2. if first point is 'OFF-CURVE' => we store it into c_begin and set has_c_begin= true
// the c_begin will be use when we close the contour
//
//
//eg. glyph '2' in Century font starts with 'OFF-CURVE' point, and ends with 'OFF-CURVE'
//-------------------------------------------------------------------
#if DEBUG
int dbug_cmdcount = 0;
#endif
for (; cpoint_index < nextCntBeginAtIndex; ++cpoint_index)
{
#if DEBUG
dbug_cmdcount++;
#endif
//for each point in this contour
//point p is an on-curve point (on outline). (not curve control point)
//possible ways..
//1. if we are in curve mode, then p is end point
// we must decide which curve to create (Curve3 or Curve4)
// easy, ...
// if curveControlPointCount == 1 , then create Curve3
// else curveControlPointCount ==2 , then create Curve4
//2. if we are NOT in curve mode,
// if p is first point then set this to x0,y0
// else then p is end point of a line.
GlyphPointF p = glyphPoints[cpoint_index];
cnt_point_count++;
float p_x = p.X * scale;
float p_y = p.Y * scale;
//int vtag = (int)flags[cpoint_index] & 0x1;
//bool has_dropout = (((vtag >> 2) & 0x1) != 0);
//int dropoutMode = vtag >> 3;
if (p.onCurve)
{
//-------------------------------------------------------------------
//[B]
//point p is an 'on-curve' point (on outline).
//(not curve control point)***
//the point touch the outline.
//possible ways..
//1. if we are in offCurveMode, then p is a curve end point.
// we must decide which curve to create (Curve3 or Curve4)
// easy, ...
// if curveControlPointCount == 1 , then create Curve3
// else curveControlPointCount ==2 , then create Curve4 (BUT SHOULD NOT BE FOUND IN TRUE TYPEFONT'(
//2. if we are NOT in offCurveMode,
// if p is first point then set this to =>moveto(x0,y0)
// else then p is end point of a line => lineto(x1,y1)
//-------------------------------------------------------------------
if (offCurveMode)
{
//as describe above [B.1] ,...
switch (curveControlPointCount)
{
case 1:
tx.Curve3(
c1.X, c1.Y,
p_x, p_y);
break;
default:
//for TrueType font
//we should not be here?
throw new NotSupportedException();
}
//reset curve control point count
curveControlPointCount = 0;
//we touch the curve, set offCurveMode= false
offCurveMode = false;
}
else
{
// p is ON CURVE, but now we are in OFF-CURVE mode.
//
//as describe above [B.2] ,...
if (!foundFirstOnCurvePoint)
{
//special treament for first point
foundFirstOnCurvePoint = true;
switch (curveControlPointCount)
{
case 0:
//describe above, see [A.1]
tx.MoveTo(latest_moveto_x = p_x, latest_moveto_y = p_y);
break;
case 1:
//describe above, see [A.2]
c_begin = c1;
has_c_begin = true;
//since c1 is off curve
//we skip the c1 for and use it when we close the curve
tx.MoveTo(latest_moveto_x = p_x, latest_moveto_y = p_y);
curveControlPointCount--;
break;
default: throw new NotSupportedException();
}
}
else
{
tx.LineTo(p_x, p_y);
}
//if (has_dropout)
//{
// //printf("[%d] on,dropoutMode=%d: %d,y:%d \n", mm, dropoutMode, vpoint.x, vpoint.y);
//}
//else
//{
// //printf("[%d] on,x: %d,y:%d \n", mm, vpoint.x, vpoint.y);
//}
}
}
else
{
//p is OFF-CURVE point (this is curve control point)
//
if (cnt_point_count == 1)
{
//1st point
startWithOffCurve = true;
}
switch (curveControlPointCount)
{
case 0:
c1 = new Vector2(p_x, p_y);
if (foundFirstOnCurvePoint)
{
//this point is curve control point***
//so set curve mode = true
//check number if existing curve control
offCurveMode = true;
}
else
{
//describe above, see [A.2]
}
break;
case 1:
{
if (!foundFirstOnCurvePoint)
{
Vector2 mid2 = GetMidPoint(c1, p_x, p_y);
//----------
//2. generate curve3 ***
c_begin = c1;
has_c_begin = true;
tx.MoveTo(latest_moveto_x = mid2.X, latest_moveto_y = mid2.Y);
// curveControlPointCount--;
foundFirstOnCurvePoint = true;
c1 = new Vector2(p_x, p_y);
continue;
}
//we already have previous 1st control point (c1)
//-------------------------------------
//please note that TrueType font
//compose of Quadractic Bezier Curve (Curve3) ***
//-------------------------------------
//in this case, this is NOT Cubic,
//this is 2 CONNECTED Quadractic Bezier Curves***
//
//we must create 'end point' of the first curve
//and set it as 'begin point of the second curve.
//
//this is done by ...
//1. calculate mid point between c1 and the latest point (p_x,p_y)
Vector2 mid = GetMidPoint(c1, p_x, p_y);
//----------
//2. generate curve3 ***
tx.Curve3(
c1.X, c1.Y,
mid.X, mid.Y);
//------------------------
//3. so curve control point number is reduce by 1***
curveControlPointCount--;
//------------------------
//4. and set (p_x,p_y) as 1st control point for the new curve
c1 = new Vector2(p_x, p_y);
offCurveMode = true;
//
//printf("[%d] bzc2nd, x: %d,y:%d \n", mm, vpoint.x, vpoint.y);
}
break;
default:
throw new NotSupportedException();
}
//count
curveControlPointCount++;
}
}
//--------
//when finish,
//ensure that the contour is closed.
if (offCurveMode)
{
switch (curveControlPointCount)
{
case 0: break;
case 1:
{
if (has_c_begin)
{
Vector2 mid = GetMidPoint(c1, c_begin.X, c_begin.Y);
//----------
//2. generate curve3 ***
tx.Curve3(
c1.X, c1.Y,
mid.X, mid.Y);
//------------------------
//3. so curve control point number is reduce by 1***
curveControlPointCount--;
//------------------------
tx.Curve3(
c_begin.X, c_begin.Y,
latest_moveto_x, latest_moveto_y);
}
else
{
tx.Curve3(
c1.X, c1.Y,
latest_moveto_x, latest_moveto_y);
}
}
break;
default:
//for TrueType font
//we should not be here?
throw new NotSupportedException();
}
}
else
{
//end with touch curve
//but if this start with off curve
//then we must close it properly
if (startWithOffCurve)
{
//start with off-curve and end with touch curve
tx.Curve3(
c_begin.X, c_begin.Y,
latest_moveto_x, latest_moveto_y);
}
}
//--------
tx.CloseContour(); //***
startContour++;
//--------
todoContourCount--;
//--------
}
//finish
tx.EndRead();
}
public ContourToGlyphTranslator(IGlyphTranslator tx) => _tx = tx;
void Run(IGlyphTranslator tx, Type2GlyphInstructionList instructionList, ref double currentX, ref double currentY)
{
//recursive ***
Type2EvaluationStack evalStack = GetFreeEvalStack(); //**
evalStack._currentX = currentX;
evalStack._currentY = currentY;
List <Type2Instruction> insts = instructionList.Insts;
evalStack.GlyphTranslator = tx;
int j = insts.Count;
for (int i = 0; i < j; ++i)
{
Type2Instruction inst = insts[i];
//if (inst.Op != OperatorName.LoadInt)
//{
//}
switch (inst.Op)
{
default: throw new NotSupportedException();
case OperatorName.GlyphWidth:
//TODO:
break;
case OperatorName.LoadInt:
evalStack.Push(inst.Value);
break; //
case OperatorName.endchar:
evalStack.EndChar();
break;
case OperatorName.flex: evalStack.Flex(); break;
case OperatorName.hflex: evalStack.H_Flex(); break;
case OperatorName.hflex1: evalStack.H_Flex1(); break;
case OperatorName.flex1: evalStack.Flex1(); break;
//-------------------------
//4.4: Arithmetic Operators
case OperatorName.abs: evalStack.Op_Abs(); break;
case OperatorName.add: evalStack.Op_Add(); break;
case OperatorName.sub: evalStack.Op_Sub(); break;
case OperatorName.div: evalStack.Op_Div(); break;
case OperatorName.neg: evalStack.Op_Neg(); break;
case OperatorName.random: evalStack.Op_Random(); break;
case OperatorName.mul: evalStack.Op_Mul(); break;
case OperatorName.sqrt: evalStack.Op_Sqrt(); break;
case OperatorName.drop: evalStack.Op_Drop(); break;
case OperatorName.exch: evalStack.Op_Exch(); break;
case OperatorName.index: evalStack.Op_Index(); break;
case OperatorName.roll: evalStack.Op_Roll(); break;
case OperatorName.dup: evalStack.Op_Dup(); break;
//-------------------------
//4.5: Storage Operators
case OperatorName.put: evalStack.Put(); break;
case OperatorName.get: evalStack.Get(); break;
//-------------------------
//4.6: Conditional
case OperatorName.and: evalStack.Op_And(); break;
case OperatorName.or: evalStack.Op_Or(); break;
case OperatorName.not: evalStack.Op_Not(); break;
case OperatorName.eq: evalStack.Op_Eq(); break;
case OperatorName.ifelse: evalStack.Op_IfElse(); break;
//
case OperatorName.rlineto: evalStack.R_LineTo(); break;
case OperatorName.hlineto: evalStack.H_LineTo(); break;
case OperatorName.vlineto: evalStack.V_LineTo(); break;
case OperatorName.rrcurveto: evalStack.RR_CurveTo(); break;
case OperatorName.hhcurveto: evalStack.HH_CurveTo(); break;
case OperatorName.hvcurveto: evalStack.HV_CurveTo(); break;
case OperatorName.rcurveline: evalStack.R_CurveLine(); break;
case OperatorName.rlinecurve: evalStack.R_LineCurve(); break;
case OperatorName.vhcurveto: evalStack.VH_CurveTo(); break;
case OperatorName.vvcurveto: evalStack.VV_CurveTo(); break;
//-------------------------------------------------------------------
case OperatorName.rmoveto: evalStack.R_MoveTo(); break;
case OperatorName.hmoveto: evalStack.H_MoveTo(); break;
case OperatorName.vmoveto: evalStack.V_MoveTo(); break;
//-------------------------------------------------------------------
//4.3 Hint Operators
case OperatorName.hstem: evalStack.H_Stem(); break;
case OperatorName.vstem: evalStack.V_Stem(); break;
case OperatorName.vstemhm: evalStack.V_StemHM(); break;
case OperatorName.hstemhm: evalStack.H_StemHM(); break;
//--------------------------
case OperatorName.hintmask1: evalStack.HintMask1(inst.Value); break;
case OperatorName.hintmask2: evalStack.HintMask2(inst.Value); break;
case OperatorName.hintmask3: evalStack.HintMask3(inst.Value); break;
case OperatorName.hintmask4: evalStack.HintMask4(inst.Value); break;
case OperatorName.hintmask_bits: evalStack.HintMaskBits(inst.Value); break;
//------------------------------
case OperatorName.cntrmask1: evalStack.CounterSpaceMask1(inst.Value); break;
case OperatorName.cntrmask2: evalStack.CounterSpaceMask2(inst.Value); break;
case OperatorName.cntrmask3: evalStack.CounterSpaceMask3(inst.Value); break;
case OperatorName.cntrmask4: evalStack.CounterSpaceMask4(inst.Value); break;
case OperatorName.cntrmask_bits: evalStack.CounterSpaceMaskBits(inst.Value); break;
//-------------------------
//4.7: Subroutine Operators
case OperatorName._return:
{
//***
//don't forget to return _evalStack's currentX, currentY to prev evl context
currentX = evalStack._currentX;
currentY = evalStack._currentY;
evalStack.Ret();
}
break;
case OperatorName.callsubr:
{
//resolve local subrountine
int rawSubRoutineNum = (int)evalStack.Pop();
Type2GlyphInstructionList resolvedSubroutine = _cff1Font._localSubrs[rawSubRoutineNum + _cffBias];
//then we move to another context
//recursive ***
Run(tx, resolvedSubroutine, ref evalStack._currentX, ref evalStack._currentY);
}
break;
case OperatorName.callgsubr: throw new NotSupportedException();
}
}
ReleaseEvalStack(evalStack);//****
}
static void CreateFitShape(IGlyphTranslator tx,
GlyphContour contour,
float pixelScale,
bool x_axis,
bool y_axis,
bool useHalfPixel)
{
List <GlyphPoint2D> mergePoints = contour.mergedPoints;
int j = mergePoints.Count;
//merge 0 = start
double prev_px = 0;
double prev_py = 0;
double p_x = 0;
double p_y = 0;
double first_px = 0;
double first_py = 0;
{
GlyphPoint2D p = mergePoints[0];
p_x = p.x * pixelScale;
p_y = p.y * pixelScale;
if (y_axis && p.isPartOfHorizontalEdge && p.isUpperSide && p_y > 3)
{
//vertical fitting
//fit p_y to grid
p_y = RoundToNearestVerticalSide((float)p_y, useHalfPixel);
}
if (x_axis && p.IsPartOfVerticalEdge && p.IsLeftSide)
{
float new_x = RoundToNearestHorizontalSide((float)p_x);
//adjust right-side vertical edge
EdgeLine rightside = p.GetMatchingVerticalEdge();
if (rightside != null)
{
}
p_x = new_x;
}
tx.MoveTo((float)p_x, (float)p_y);
//-------------
first_px = prev_px = p_x;
first_py = prev_py = p_y;
}
for (int i = 1; i < j; ++i)
{
//all merge point is polygon point
GlyphPoint2D p = mergePoints[i];
p_x = p.x * pixelScale;
p_y = p.y * pixelScale;
if (y_axis && p.isPartOfHorizontalEdge && p.isUpperSide && p_y > 3)
{
//vertical fitting
//fit p_y to grid
p_y = RoundToNearestVerticalSide((float)p_y, useHalfPixel);
}
if (x_axis && p.IsPartOfVerticalEdge && p.IsLeftSide)
{
//horizontal fitting
//fix p_x to grid
float new_x = RoundToNearestHorizontalSide((float)p_x);
////adjust right-side vertical edge
//PixelFarm.Agg.Typography.EdgeLine rightside = p.GetMatchingVerticalEdge();
//if (rightside != null && !rightside.IsLeftSide && rightside.IsOutside)
//{
// var rightSideP = rightside.p.userData as GlyphPoint2D;
// var rightSideQ = rightside.q.userData as GlyphPoint2D;
// //find move diff
// float movediff = (float)p_x - new_x;
// //adjust right side edge
// rightSideP.x = rightSideP.x + movediff;
// rightSideQ.x = rightSideQ.x + movediff;
//}
p_x = new_x;
}
//
tx.LineTo((float)p_x, (float)p_y);
//
prev_px = p_x;
prev_py = p_y;
}
tx.LineTo((float)first_px, (float)first_py);
}
public static void Read(this IGlyphTranslator tx, GlyphPointF[] glyphPoints, ushort[] contourEndPoints, float scale = 1, float offsetX = 0, float offsetY = 0)
{
int startContour = 0;
int cpoint_index = 0;//current point index
int todoContourCount = contourEndPoints.Length;
//-----------------------------------
//1. start read data from a glyph
tx.BeginRead(todoContourCount);
//-----------------------------------
float latest_moveto_x = 0;
float latest_moveto_y = 0;
int curveControlPointCount = 0; // 1 curve control point => Quadratic, 2 curve control points => Cubic
while (todoContourCount > 0)
{
//foreach contour...
//next contour will begin at...
int nextCntBeginAtIndex = contourEndPoints[startContour] + 1;
//reset ...
bool has_c_begin = false; //see below [A]
Vector2 c_begin = new Vector2(); //special point if the glyph starts with 'off-curve' control point
Vector2 c1 = new Vector2(); //control point of quadratic curve
//-------------------------------------------------------------------
bool offCurveMode = false;
bool isFirstOnCurvePoint = true; //first point of this contour
//-------------------------------------------------------------------
//[A]
//first point may start with 'ON CURVE" or 'OFF-CURVE'
//1. if first point is 'ON-CURVE' => we just set moveto command to it
//
//2. if first point is 'OFF-CURVE' => we store it into c_begin and set has_c_begin= true
// the c_begin will be use when we close the contour
//
//
//eg. glyph '2' in Century font starts with 'OFF-CURVE' point, and ends with 'OFF-CURVE'
//-------------------------------------------------------------------
for (; cpoint_index < nextCntBeginAtIndex; ++cpoint_index)
{ //for each point in this contour
GlyphPointF p = glyphPoints[cpoint_index];
float p_x = p.X * scale;
float p_y = p.Y * -scale;
p_x += offsetX;
p_y += offsetY;
if (p.onCurve)
{
//-------------------------------------------------------------------
//[B]
//point p is an 'on-curve' point (on outline).
//(not curve control point)***
//the point touch the outline.
//possible ways..
//1. if we are in offCurveMode, then p is a curve end point.
// we must decide which curve to create (Curve3 or Curve4)
// easy, ...
// if curveControlPointCount == 1 , then create Curve3
// else curveControlPointCount ==2 , then create Curve4 (BUT SHOULD NOT BE FOUND IN TRUE TYPEFONT'(
//2. if we are NOT in offCurveMode,
// if p is first point then set this to =>moveto(x0,y0)
// else then p is end point of a line => lineto(x1,y1)
//-------------------------------------------------------------------
if (offCurveMode)
{
//as describe above [B.1]
switch (curveControlPointCount)
{
case 1:
tx.Curve3(c1.X, c1.Y, p_x, p_y);
break;
default:
throw new NotSupportedException();
}
//reset curve control point count
curveControlPointCount = 0;
//we touch the curve, set offCurveMode= false
offCurveMode = false;
}
else
{
// p is ON CURVE, but now we are in OFF-CURVE mode.
//as describe above [B.2]
if (isFirstOnCurvePoint)
{
//special treament for first point
isFirstOnCurvePoint = false;
switch (curveControlPointCount)
{
case 0:
//describe above, see [A.1]
tx.MoveTo(latest_moveto_x = p_x, latest_moveto_y = p_y);
break;
case 1:
//describe above, see [A.2]
c_begin = c1;
has_c_begin = true;
//since c1 is off curve
//we skip the c1 for and use it when we close the curve
//tx.MoveTo(latest_moveto_x = c1.X, latest_moveto_y = c1.Y);
//tx.LineTo(p_x, p_y);
tx.MoveTo(latest_moveto_x = p_x, latest_moveto_y = p_y);
curveControlPointCount--;
break;
default:
throw new NotSupportedException();
}
}
else
{
tx.LineTo(p_x, p_y);
}
}
}
else
{
//p is OFF-CURVE point (this is curve control point)
switch (curveControlPointCount)
{
case 0:
c1 = new Vector2(p_x, p_y);
if (!isFirstOnCurvePoint)
{
//this point is curve control point
//so set curve mode = true
//check number if existing curve control
offCurveMode = true;
}
else
{
//describe above, see [A.2]
}
break;
case 1:
{
//we already have previous 1st control point (c1)
//-------------------------------------
//please note that TrueType font
//compose of Quadractic Bezier Curve (Curve3)
//-------------------------------------
//in this case, this is NOT Cubic,
//this is 2 CONNECTED Quadractic Bezier Curves
//
//we must create 'end point' of the first curve
//and set it as 'begin point of the second curve.
//
//this is done by ...
//1. calculate mid point between c1 and the latest point (p_x,p_y)
Vector2 mid = GetMidPoint(c1, p_x, p_y);
//2. generate curve3 ***
tx.Curve3(c1.X, c1.Y, mid.X, mid.Y);
//3. so curve control point number is reduce by 1
curveControlPointCount--;
//4. and set (p_x,p_y) as 1st control point for the new curve
c1 = new Vector2(p_x, p_y);
offCurveMode = true;
}
break;
default:
throw new NotSupportedException();
}
//count
curveControlPointCount++;
}
}
//when finish, ensure that the contour is closed.
if (offCurveMode)
{
switch (curveControlPointCount)
{
case 0: break;
case 1:
{
if (has_c_begin)
{
Vector2 mid = GetMidPoint(c1, c_begin.X, c_begin.Y);
//2. generate curve3
tx.Curve3(c1.X, c1.Y, mid.X, mid.Y);
//3. so curve control point number is reduce by 1
curveControlPointCount--;
tx.Curve3(c_begin.X, c_begin.Y,
latest_moveto_x, latest_moveto_y);
}
else
{
tx.Curve3(
c1.X, c1.Y,
latest_moveto_x, latest_moveto_y);
}
}
break;
default:
{
throw new NotSupportedException();
}
}
//reset
offCurveMode = false;
curveControlPointCount = 0;
}
tx.CloseContour();
startContour++;
todoContourCount--;
}
//finish
tx.EndRead();
}
public static void Read(this IGlyphTranslator tx, GlyphPointF[] glyphPoints, ushort[] contourEndPoints, float scale = 1)
{
int startContour = 0;
int cpoint_index = 0;//current point index
int todoContourCount = contourEndPoints.Length;
//-----------------------------------
//1. start read data from a glyph
tx.BeginRead(todoContourCount);
//-----------------------------------
float latest_moveto_x = 0;
float latest_moveto_y = 0;
int curveControlPointCount = 0; // 1 curve control point => Quadratic, 2 curve control points => Cubic
while (todoContourCount > 0)
{
//foreach contour...
//next contour will begin at...
int nextCntBeginAtIndex = contourEndPoints[startContour] + 1;
//reset ...
Vector2 c1 = new Vector2();
Vector2 c2 = new Vector2();
bool curveMode = false;
bool isFirstPoint = true; //first point of this contour
///for each point in this contour
for (; cpoint_index < nextCntBeginAtIndex; ++cpoint_index)
{
GlyphPointF p = glyphPoints[cpoint_index];
float p_x = p.X * scale;
float p_y = p.Y * scale;
//int vtag = (int)flags[cpoint_index] & 0x1;
//bool has_dropout = (((vtag >> 2) & 0x1) != 0);
//int dropoutMode = vtag >> 3;
if (p.onCurve)
{
//point p is an on-curve point (on outline). (not curve control point)
//possible ways..
//1. if we are in curve mode, then p is end point
// we must decide which curve to create (Curve3 or Curve4)
// easy, ...
// if curveControlPointCount == 1 , then create Curve3
// else curveControlPointCount ==2 , then create Curve4
//2. if we are NOT in curve mode,
// if p is first point then set this to x0,y0
// else then p is end point of a line.
if (curveMode)
{
switch (curveControlPointCount)
{
case 1:
{
tx.Curve3(
c1.X, c1.Y,
p_x, p_y);
}
break;
case 2:
{
//for TrueType font
//we should not be here?
tx.Curve4(
c1.X, c1.Y,
c2.X, c2.Y,
p_x, p_y);
}
break;
default:
{
throw new NotSupportedException();
}
}
//reset curve control point count
curveControlPointCount = 0;
//exist from curve mode
curveMode = false;
}
else
{
//as describe above,...
if (isFirstPoint)
{
isFirstPoint = false;
tx.MoveTo(latest_moveto_x = (p_x), latest_moveto_y = (p_y));
}
else
{
tx.LineTo(p_x, p_y);
}
//if (has_dropout)
//{
// //printf("[%d] on,dropoutMode=%d: %d,y:%d \n", mm, dropoutMode, vpoint.x, vpoint.y);
//}
//else
//{
// //printf("[%d] on,x: %d,y:%d \n", mm, vpoint.x, vpoint.y);
//}
}
}
else
{
//this point is curve control point***
//so set curve mode = true
curveMode = true;
//check number if existing curve control
switch (curveControlPointCount)
{
case 0:
c1 = new Vector2(p_x, p_y);
//this point may be part 1st control point of a curve,
//store it and wait for next point before make decision ***
break;
case 1:
//we already have previous 1st control point (c1)
//-------------------------------------
//please note that TrueType font
//compose of Quadractic Bezier Curve (Curve3) ***
//-------------------------------------
//in this case, this is NOT Cubic,
//this is 2 CONNECTED Quadractic Bezier Curves***
//
//we must create 'end point' of the first curve
//and set it as 'begin point of the second curve.
//
//this is done by ...
//1. calculate mid point between c1 and the latest point (p_x,p_y)
Vector2 mid = GetMid(c1, p_x, p_y);
//----------
//2. generate curve3 ***
tx.Curve3(
c1.X, c1.Y,
mid.X, mid.Y);
//------------------------
//3. so curve control point number is reduce by 1***
curveControlPointCount--;
//------------------------
//4. and set (p_x,p_y) as 1st control point for the new curve
c1 = new Vector2(p_x, p_y);
//
//printf("[%d] bzc2nd, x: %d,y:%d \n", mm, vpoint.x, vpoint.y);
break;
default:
throw new NotSupportedException();
}
//count
curveControlPointCount++;
}
}
//--------
//when finish,
//ensure that the contour is closed.
if (curveMode)
{
switch (curveControlPointCount)
{
case 0: break;
case 1:
{
tx.Curve3(c1.X, c1.Y,
latest_moveto_x, latest_moveto_y);
}
break;
case 2:
{
//for TrueType font
//we should not be here?
tx.Curve4(c1.X, c1.Y,
c2.X, c2.Y,
latest_moveto_x, latest_moveto_y);
}
break;
default:
{ throw new NotSupportedException(); }
}
//reset
curveMode = false;
curveControlPointCount = 0;
}
//--------
tx.CloseContour(); //***
startContour++;
todoContourCount--;
//--------
}
//finish
tx.EndRead();
}
//-----------
//for CFF1
public static void Read(this IGlyphTranslator tx, CFF.Cff1Font cff1Font, CFF.Cff1GlyphData glyphData, float scale = 1)
{
CFF.CffEvaluationEngine evalEngine = new CFF.CffEvaluationEngine();
evalEngine.Run(tx, cff1Font, glyphData.GlyphInstructions, scale);
}
public void Reset()
{
_currentIndex = 0;
_currentX = _currentY = 0;
_glyphTranslator = null;
}
public void Run(IGlyphTranslator tx, Cff1Font cff1Font, Cff1GlyphData glyphData, float scale = 1)
{
Run(tx, cff1Font, glyphData.GlyphInstructions, scale);
}
/// <summary>
/// build and translate
/// </summary>
/// <param name="builder"></param>
/// <param name="glyphIndex"></param>
/// <param name="sizeInPoints"></param>
/// <param name="tx"></param>
public static void BuildFromGlyphIndex(this GlyphOutlineBuilderBase builder, ushort glyphIndex, float sizeInPoints, IGlyphTranslator tx)
{
builder.BuildFromGlyphIndex(glyphIndex, sizeInPoints);
builder.ReadShapes(tx);
}