protected override void OnFontSizeChanged()
{
//update some font matrix property
if (_currentTypeface != null)
{
float pointToPixelScale = _currentTypeface.CalculateFromPointToPixelScale(this.FontSizeInPoints);
this.FontAscendingPx = _currentTypeface.Ascender * pointToPixelScale;
this.FontDescedingPx = _currentTypeface.Descender * pointToPixelScale;
this.FontLineGapPx = _currentTypeface.LineGap * pointToPixelScale;
this.FontLineSpacingPx = FontAscendingPx - FontDescedingPx + FontLineGapPx;
}
}
public ManagedActualFont(ManagedFontFace ownerFace, float sizeInPoints, FontStyle style)
{
this.ownerFace = ownerFace;
this.sizeInPoints = sizeInPoints;
this.style = style;
this.typeFace = ownerFace.Typeface;
//calculate scale ***
scale = typeFace.CalculateFromPointToPixelScale(sizeInPoints);
}
public override void DrawGlyphPlanList(List <GlyphPlan> glyphPlanList, int startAt, int len, float xpos, float ypos)
{
CanvasPainter canvasPainter = this.TargetCanvasPainter;
Typeface typeface = _glyphPathBuilder.Typeface;
//3. layout glyphs with selected layout technique
//TODO: review this again, we should use pixel?
float fontSizePoint = this.FontSizeInPoints;
float scale = typeface.CalculateFromPointToPixelScale(fontSizePoint);
//4. render each glyph
float ox = canvasPainter.OriginX;
float oy = canvasPainter.OriginY;
int endBefore = startAt + len;
//---------------------------------------------------
//consider use cached glyph, to increase performance
hintGlyphCollection.SetCacheInfo(typeface, fontSizePoint, this.HintTechnique);
//---------------------------------------------------
for (int i = startAt; i < endBefore; ++i)
{
GlyphPlan glyphPlan = glyphPlanList[i];
//-----------------------------------
//TODO: review here ***
//PERFORMANCE revisit here
//if we have create a vxs we can cache it for later use?
//-----------------------------------
VertexStore glyphVxs;
if (!hintGlyphCollection.TryGetCacheGlyph(glyphPlan.glyphIndex, out glyphVxs))
{
//if not found then create new glyph vxs and cache it
_glyphPathBuilder.BuildFromGlyphIndex(glyphPlan.glyphIndex, fontSizePoint);
//-----------------------------------
_tovxs.Reset();
_glyphPathBuilder.ReadShapes(_tovxs);
//TODO: review here,
//float pxScale = _glyphPathBuilder.GetPixelScale();
glyphVxs = new VertexStore();
_tovxs.WriteOutput(glyphVxs, _vxsPool);
//
hintGlyphCollection.RegisterCachedGlyph(glyphPlan.glyphIndex, glyphVxs);
}
canvasPainter.SetOrigin((float)(glyphPlan.x * scale + xpos), (float)(glyphPlan.y * scale + ypos));
canvasPainter.Fill(glyphVxs);
}
//restore prev origin
canvasPainter.SetOrigin(ox, oy);
}
void Build(ushort glyphIndex, Glyph glyph)
{
//-------------------------------------------
//1. start with original points/contours from glyph
this._outputGlyphPoints = glyph.GlyphPoints;
this._outputContours = glyph.EndPoints;
//-------------------------------------------
Typeface currentTypeFace = this._typeface;
_recentPixelScale = currentTypeFace.CalculateFromPointToPixelScale(SizeInPoints); //***
_useAutoHint = false; //reset
//-------------------------------------------
//2. process glyph points
if (UseTrueTypeInstructions &&
currentTypeFace.HasPrepProgramBuffer &&
glyph.HasGlyphInstructions)
{
_trueTypeInterpreter.UseVerticalHinting = this.UseVerticalHinting;
//output as points,
this._outputGlyphPoints = _trueTypeInterpreter.HintGlyph(glyphIndex, SizeInPoints);
//all points are scaled from _trueTypeInterpreter,
//so not need further scale.=> set _recentPixelScale=1
_recentPixelScale = 1;
}
else
{
//not use interperter so we need to scale it with our machnism
//this demonstrate our auto hint engine ***
//you can change this to your own hint engine***
if (this.UseVerticalHinting)
{
_useAutoHint = true;
if (!_fitoutlineCollection.TryGetValue(glyphIndex, out _fitOutline))
{
_fitOutline = _fitShapeAnalyzer.Analyze(
this._outputGlyphPoints,
this._outputContours);
_fitoutlineCollection.Add(glyphIndex, _fitOutline);
}
}
}
}
List <ushort> inputGlyphs = new List <ushort>(); //not thread safe***
public void Print(Typeface typeface, float size, char[] str, List <GlyphPlan> glyphPlanBuffer)
{
//1. layout
_glyphLayout.Layout(typeface, size, str, glyphPlanBuffer);
var glyphPathBuilder = new MyGlyphPathBuilder(typeface);
int j = glyphPlanBuffer.Count;
float pxScale = typeface.CalculateFromPointToPixelScale(size);
for (int i = 0; i < j; ++i)
{
GlyphPlan glyphPlan = glyphPlanBuffer[i];
//-----------------------------------
//check if we static vxs/bmp for this glyph
//if not, create and cache
//-----------------------------------
glyphPathBuilder.BuildFromGlyphIndex(glyphPlan.glyphIndex, size);
//-----------------------------------
var vxsBuilder = new GlyphPathBuilderVxs();
glyphPathBuilder.ReadShapes(vxsBuilder);
glyphPlan.vxs = vxsBuilder.GetVxs(pxScale);
}
}
public float GetPixelScale()
{
return(_typeface.CalculateFromPointToPixelScale(SizeInPoints));
}
List <ushort> inputGlyphs = new List <ushort>(); //not thread safe***
public void Layout(Typeface typeface, float size, char[] str, List <GlyphPlan> glyphPlanBuffer)
{
//----------------------------------------------
//1. convert char[] to glyph[]
//2. send to shaping engine
//3. layout position of each glyph
//----------------------------------------------
//check if we have created a glyph cache for the typeface
GlyphsCache glyphCache;
if (!_glyphCaches.TryGetValue(typeface, out glyphCache))
{
//create new
glyphCache = new GlyphsCache(typeface);
_glyphCaches.Add(typeface, glyphCache);
}
//----------------------------------------------
int j = str.Length;
inputGlyphs.Clear();
for (int i = 0; i < j; ++i)
{
//1. convert char[] to glyphIndex[]
inputGlyphs.Add((ushort)typeface.LookupIndex(str[i]));
}
//----------------------------------------------
//glyph substitution
if (j > 1)
{
GlyphSubStitution glyphSubstitution = new GlyphSubStitution(typeface, this.ScriptLang.shortname);
glyphSubstitution.EnableLigation = this.EnableLigature;
glyphSubstitution.DoSubstitution(inputGlyphs);
}
//----------------------------------------------
//glyph position
j = inputGlyphs.Count;
List <GlyphPos> glyphPositions = new List <GlyphPos>(j);
for (int i = 0; i < j; ++i)
{
ushort glyIndex = inputGlyphs[i];
glyphPositions.Add(new GlyphPos(
glyIndex,
typeface.GetGlyphByIndex(glyIndex).GlyphClass,
typeface.GetHAdvanceWidthFromGlyphIndex(glyIndex))
);
}
PositionTecnhique posTech = this.PositionTechnique;
if (j > 1 && posTech == PositionTecnhique.OpenFont)
{
GlyphSetPosition glyphSetPos = new GlyphSetPosition(typeface, ScriptLang.shortname);
glyphSetPos.DoGlyphPosition(glyphPositions);
}
//--------------
float scale = typeface.CalculateFromPointToPixelScale(size);
float cx = 0;
float cy = 0;
j = inputGlyphs.Count;
for (int i = 0; i < j; ++i)
{
ushort glyIndex = inputGlyphs[i];
GlyphPlan glyphPlan = new GlyphPlan(glyIndex);
glyphPlanBuffer.Add(glyphPlan);
//this advWidth in font design unit
float advWidth = typeface.GetHAdvanceWidthFromGlyphIndex(glyIndex) * scale;
//----------------------------------
switch (posTech)
{
case PositionTecnhique.None:
{
glyphPlan.x = cx;
glyphPlan.y = cy;
glyphPlan.advX = advWidth;
}
break;
case PositionTecnhique.OpenFont:
{
GlyphPos gpos_offset = glyphPositions[i];
glyphPlan.x = cx + (scale * gpos_offset.xoffset);
glyphPlan.y = cy + (scale * gpos_offset.yoffset);
glyphPlan.advX = advWidth;
}
break;
case PositionTecnhique.Kerning:
{
glyphPlan.x = cx;
glyphPlan.y = cy;
glyphPlan.advX = advWidth;
if (i > 0)
{
advWidth += typeface.GetKernDistance(glyphPlanBuffer[i - 1].glyphIndex, glyphPlanBuffer[i].glyphIndex) * scale;
}
}
break;
}
cx += advWidth;
}
}
public override float GetScale(float pointSize)
{
return(typeface.CalculateFromPointToPixelScale(pointSize));
}