const double FT_RESIZE = 64; //essential to be floating point
internal unsafe static GlyphImage BuildMsdfFontImage(NativeFontGlyph fontGlyph)
{
IntPtr shape = MyFtLib.CreateShape();
FT_Outline outline = (*(FT_Outline *)fontGlyph.nativeOutlinePtr); //outline version
//------------------------------
int npoints = outline.n_points;
List <PixelFarm.VectorMath.Vector2> points = new List <PixelFarm.VectorMath.Vector2>(npoints);
int startContour = 0;
int cpoint_index = 0;
int todoContourCount = outline.n_contours;
int controlPointCount = 0;
while (todoContourCount > 0)
{
int nextContour = outline.contours[startContour] + 1;
bool isFirstPoint = true;
//---------------
//create contour
IntPtr cnt = MyFtLib.ShapeAddBlankContour(shape);
FtVec2 secondControlPoint = new FtVec2();
FtVec2 thirdControlPoint = new FtVec2();
bool justFromCurveMode = false;
FtVec2 lastMoveTo = new FtVec2();
FtVec2 lastPoint = new FtVec2();
FtVec2 current_point = new Fonts.FtVec2();
for (; cpoint_index < nextContour; ++cpoint_index)
{
FT_Vector xvpoint = outline.points[cpoint_index];
current_point = new FtVec2(xvpoint.x / FT_RESIZE, xvpoint.y / FT_RESIZE);
//Console.WriteLine(xvpoint.x.ToString() + "," + xvpoint.y);
byte vtag = outline.tags[cpoint_index];
bool has_dropout = (((vtag >> 2) & 0x1) != 0);
int dropoutMode = vtag >> 3;
if ((vtag & 0x1) != 0)
{
if (justFromCurveMode)
{
switch (controlPointCount)
{
case 1:
{
MyFtLib.ContourAddQuadraticSegment(cnt,
lastPoint.x, lastPoint.y,
secondControlPoint.x, secondControlPoint.y,
current_point.x, current_point.y);
lastPoint = current_point;
}
break;
case 2:
{
MyFtLib.ContourAddCubicSegment(cnt,
lastPoint.x, lastPoint.y,
secondControlPoint.x, secondControlPoint.y,
thirdControlPoint.x, thirdControlPoint.y,
current_point.x, current_point.y);
lastPoint = current_point;
}
break;
default:
{
throw new NotSupportedException();
}
}
controlPointCount = 0;
justFromCurveMode = false;
}
else
{
//line mode
if (isFirstPoint)
{
isFirstPoint = false;
lastMoveTo = lastPoint = current_point;
}
else
{
MyFtLib.ContourAddLinearSegment(cnt,
lastPoint.x, lastPoint.y,
current_point.x, current_point.y);
lastPoint = current_point;
}
}
}
else
{
if (isFirstPoint)
{
isFirstPoint = false;
lastMoveTo = lastPoint = current_point;
}
switch (controlPointCount)
{
case 0:
{ //bit 1 set=> off curve, this is a control point
//if this is a 2nd order or 3rd order control point
if (((vtag >> 1) & 0x1) != 0)
{
////printf("[%d] bzc3rd, x: %d,y:%d \n", mm, vpoint.x, vpoint.y);
thirdControlPoint = new FtVec2(current_point.x, current_point.y);
}
else
{
////printf("[%d] bzc2nd, x: %d,y:%d \n", mm, vpoint.x, vpoint.y);
secondControlPoint = new FtVec2(current_point.x, current_point.y);
}
}
break;
case 1:
{
if (((vtag >> 1) & 0x1) != 0)
{
////printf("[%d] bzc3rd, x: %d,y:%d \n", mm, vpoint.x, vpoint.y);
thirdControlPoint = new FtVec2(current_point.x, current_point.y);
}
else
{
//we already have prev second control point
//so auto calculate line to
//between 2 point
FtVec2 mid = GetMidPoint(secondControlPoint, current_point);
MyFtLib.ContourAddQuadraticSegment(cnt,
lastPoint.x, lastPoint.y,
secondControlPoint.x, secondControlPoint.y,
mid.x, mid.y);
lastPoint = mid;
//------------------------
controlPointCount--;
//------------------------
//printf("[%d] bzc2nd, x: %d,y:%d \n", mm, vpoint.x, vpoint.y);
secondControlPoint = current_point;
}
}
break;
default:
{
throw new NotSupportedException();
}
}
controlPointCount++;
justFromCurveMode = true;
}
}
//--------
//close figure
//if in curve mode
if (justFromCurveMode)
{
switch (controlPointCount)
{
case 0: break;
case 1:
{
MyFtLib.ContourAddQuadraticSegment(cnt,
lastPoint.x, lastPoint.y,
secondControlPoint.x, secondControlPoint.y,
lastMoveTo.x, lastMoveTo.y);
lastPoint = current_point;
}
break;
case 2:
{
MyFtLib.ContourAddCubicSegment(cnt,
lastPoint.x, lastPoint.y,
secondControlPoint.x, secondControlPoint.y,
thirdControlPoint.x, thirdControlPoint.y,
lastMoveTo.x, lastMoveTo.y);
lastPoint = current_point;
}
break;
default:
{ throw new NotSupportedException(); }
}
justFromCurveMode = false;
controlPointCount = 0;
}
else
{
MyFtLib.ContourAddLinearSegment(cnt,
current_point.x, current_point.y,
lastMoveTo.x, lastMoveTo.y);
lastPoint = current_point;
}
//ps.CloseFigure();
//--------
startContour++;
todoContourCount--;
}
//------------
double s_left, s_bottom, s_right, s_top;
MyFtLib.ShapeFindBounds(shape, out s_left, out s_bottom, out s_right, out s_top);
RectangleF glyphBounds = new RectangleF((float)s_left, (float)s_top, (float)(s_right - s_left), (float)(s_top - s_bottom));
//then create msdf texture
if (!MyFtLib.ShapeValidate(shape))
{
throw new NotSupportedException();
}
MyFtLib.ShapeNormalize(shape);
int borderXY = 0;
int w = (int)Math.Ceiling(glyphBounds.Width) + (borderXY + borderXY);
int h = (int)(Math.Ceiling(glyphBounds.Height)) + (borderXY + borderXY);
if (w == 0)
{
w = 5;
h = 5;
}
int[] outputBuffer = new int[w * h];
GlyphImage glyphImage = new GlyphImage(w, h);
glyphImage.BorderXY = borderXY;
glyphImage.OriginalGlyphBounds = Typography.Rendering.RectangleF.FromLTRB(
glyphBounds.Left,
glyphBounds.Top,
glyphBounds.Right,
glyphBounds.Bottom);
unsafe
{
fixed(int *output_header = &outputBuffer[0])
{
float dx = 0;
float dy = 0;
if (s_left < 0)
{
//make it positive
dx = (float)-s_left;
}
else if (s_left > 0)
{
}
if (s_bottom < 0)
{
//make it positive
dy = (float)-s_bottom;
}
else if (s_bottom > 0)
{
}
//this glyph image has border (for msdf to render correctly)
MyFtLib.MyFtGenerateMsdf(shape, w, h, 4, 1, dx + borderXY, dy + borderXY, -1, 3, output_header);
MyFtLib.DeleteUnmanagedObj(shape);
}
glyphImage.SetImageBuffer(outputBuffer, true);
}
return(glyphImage);
}
unsafe internal static void BuildGlyphOutline(NativeFontGlyph fontGlyph)
{
FT_Outline outline = (*(FT_Outline *)fontGlyph.nativeOutlinePtr);
//outline version
//------------------------------
int npoints = outline.n_points;
int startContour = 0;
int cpoint_index = 0;
int todoContourCount = outline.n_contours;
PixelFarm.Agg.VertexSource.PathWriter ps = new Agg.VertexSource.PathWriter();
fontGlyph.originalVxs = ps.Vxs;
int controlPointCount = 0;
while (todoContourCount > 0)
{
int nextContour = outline.contours[startContour] + 1;
bool isFirstPoint = true;
FtVec2 secondControlPoint = new FtVec2();
FtVec2 thirdControlPoint = new FtVec2();
bool justFromCurveMode = false;
//FT_Vector vpoint = new FT_Vector();
for (; cpoint_index < nextContour; ++cpoint_index)
{
FT_Vector vpoint = outline.points[cpoint_index];
byte vtag = outline.tags[cpoint_index];
bool has_dropout = (((vtag >> 2) & 0x1) != 0);
int dropoutMode = vtag >> 3;
// Console.WriteLine(vpoint.ToString() + " " + vtag);
if ((vtag & 0x1) != 0)
{
//on curve
if (justFromCurveMode)
{
switch (controlPointCount)
{
case 1:
{
ps.Curve3(secondControlPoint.x / FT_RESIZE, secondControlPoint.y / FT_RESIZE,
vpoint.x / FT_RESIZE, vpoint.y / FT_RESIZE);
}
break;
case 2:
{
ps.Curve4(secondControlPoint.x / FT_RESIZE, secondControlPoint.y / FT_RESIZE,
thirdControlPoint.x / FT_RESIZE, thirdControlPoint.y / FT_RESIZE,
vpoint.x / FT_RESIZE, vpoint.y / FT_RESIZE);
}
break;
default:
{
throw new NotSupportedException();
}
}
controlPointCount = 0;
justFromCurveMode = false;
}
else
{
if (isFirstPoint)
{
isFirstPoint = false;
ps.MoveTo(vpoint.x / FT_RESIZE, vpoint.y / FT_RESIZE);
}
else
{
ps.LineTo(vpoint.x / FT_RESIZE, vpoint.y / FT_RESIZE);
}
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
{
switch (controlPointCount)
{
case 0:
{ //bit 1 set=> off curve, this is a control point
//if this is a 2nd order or 3rd order control point
if (((vtag >> 1) & 0x1) != 0)
{
//printf("[%d] bzc3rd, x: %d,y:%d \n", mm, vpoint.x, vpoint.y);
thirdControlPoint = new FtVec2(vpoint);
}
else
{
//printf("[%d] bzc2nd, x: %d,y:%d \n", mm, vpoint.x, vpoint.y);
secondControlPoint = new FtVec2(vpoint);
}
}
break;
case 1:
{
if (((vtag >> 1) & 0x1) != 0)
{
//printf("[%d] bzc3rd, x: %d,y:%d \n", mm, vpoint.x, vpoint.y);
thirdControlPoint = new FtVec2(vpoint);
}
else
{
//we already have prev second control point
//so auto calculate line to
//between 2 point
FtVec2 mid = GetMidPoint(secondControlPoint, vpoint);
//----------
//generate curve3
ps.Curve3(secondControlPoint.x / FT_RESIZE, secondControlPoint.y / FT_RESIZE,
mid.x / FT_RESIZE, mid.y / FT_RESIZE);
//------------------------
controlPointCount--;
//------------------------
//printf("[%d] bzc2nd, x: %d,y:%d \n", mm, vpoint.x, vpoint.y);
secondControlPoint = new FtVec2(vpoint);
}
}
break;
default:
{
throw new NotSupportedException();
}
break;
}
controlPointCount++;
justFromCurveMode = true;
}
}
//--------
//close figure
//if in curve mode
if (justFromCurveMode)
{
switch (controlPointCount)
{
case 0: break;
case 1:
{
ps.Curve3(secondControlPoint.x / FT_RESIZE, secondControlPoint.y / FT_RESIZE,
ps.LastMoveX, ps.LastMoveY);
}
break;
case 2:
{
ps.Curve4(secondControlPoint.x / FT_RESIZE, secondControlPoint.y / FT_RESIZE,
thirdControlPoint.x / FT_RESIZE, thirdControlPoint.y / FT_RESIZE,
ps.LastMoveX, ps.LastMoveY);
}
break;
default:
{ throw new NotSupportedException(); }
}
justFromCurveMode = false;
controlPointCount = 0;
}
ps.CloseFigure();
//--------
startContour++;
todoContourCount--;
}
}