/// <summary>
/// do glyph shaping and glyph out
/// </summary>
/// <param name="str"></param>
/// <param name="startAt"></param>
/// <param name="len"></param>
public void Layout(
char[] str,
int startAt,
int len)
{
if (_needPlanUpdate)
{
UpdateLayoutPlan();
}
Typeface typeface = this._typeface;
//clear before use
_inputGlyphs.Clear();
for (int i = 0; i < len; ++i)
{
//convert input char to input glyphs
char c = str[startAt + i];
_inputGlyphs.AddGlyph(c, (ushort)typeface.LookupIndex(c));
}
//----------------------------------------------
//glyph substitution
if (_gsub != null & len > 0)
{
//TODO: review perf here
_gsub.EnableLigation = this.EnableLigature;
_gsub.DoSubstitution(_inputGlyphs);
//
_inputGlyphs.CreateMapFromUserCharToGlyphIndics();
}
//----------------------------------------------
//after glyph substitution,
//number of input glyph MAY changed (increase or decrease).***
//so count again.
int finalGlyphCount = _inputGlyphs.Count;
//----------------------------------------------
//glyph position
_glyphPositions.Clear();
for (int i = 0; i < finalGlyphCount; ++i)
{
//at this stage _inputGlyphs and _glyphPositions
//has member 1:1
ushort glyIndex = _inputGlyphs[i];
_glyphPositions.Add(new GlyphPos(
glyIndex,
typeface.GetGlyphByIndex(glyIndex).GlyphClass,
typeface.GetHAdvanceWidthFromGlyphIndex(glyIndex))
);
}
PositionTechnique posTech = this.PositionTechnique;
if (_gpos != null && len > 1 && posTech == PositionTechnique.OpenFont)
{
_gpos.DoGlyphPosition(_glyphPositions);
}
}
/// <summary>
/// do glyph shaping and glyph out
/// </summary>
/// <param name="str"></param>
/// <param name="startAt"></param>
/// <param name="len"></param>
public void Layout(
char[] str,
int startAt,
int len)
{
if (_needPlanUpdate)
{
UpdateLayoutPlan();
}
Typeface typeface = this._typeface;
//clear before use
_inputGlyphs.Clear();
for (int i = 0; i < len; ++i)
{
//this is important!
//-----------------------
// from @samhocevar's PR: (https://github.com/LayoutFarm/Typography/pull/56/commits/b71c7cf863531ebf5caa478354d3249bde40b96e)
//In many places, "char" is not a valid type to handle characters, because it
//only supports 16 bits.In order to handle the full range of Unicode characters,
//we need to use "int".
//This allows characters such as 🙌 or 𐐷 or to be treated as single codepoints even
//though they are encoded as two "char"s in a C# string.
//-----------------------
//convert input char to input glyphs
char ch = str[startAt + i];
int codepoint = ch;
if (ch >= 0xd800 && ch <= 0xdbff && i + 1 < len)
{
++i;
codepoint = char.ConvertToUtf32(ch, str[startAt + i]);
}
_inputGlyphs.AddGlyph(codepoint, typeface.LookupIndex(codepoint));
}
//----------------------------------------------
//glyph substitution
if (_gsub != null & len > 0)
{
//TODO: review perf here
_gsub.EnableLigation = this.EnableLigature;
_gsub.DoSubstitution(_inputGlyphs);
//
_inputGlyphs.CreateMapFromUserCharToGlyphIndics();
}
//----------------------------------------------
//after glyph substitution,
//number of input glyph MAY changed (increase or decrease).***
//so count again.
int finalGlyphCount = _inputGlyphs.Count;
//----------------------------------------------
//glyph position
_glyphPositions.Clear();
_glyphPositions.Typeface = typeface;
for (int i = 0; i < finalGlyphCount; ++i)
{
//at this stage _inputGlyphs and _glyphPositions
//has member 1:1
ushort glyIndex = _inputGlyphs[i];
//
Glyph orgGlyph = typeface.GetGlyphByIndex(glyIndex);
//this is original value WITHOUT fit-to-grid adjust
_glyphPositions.AddGlyph(glyIndex, orgGlyph);
}
PositionTechnique posTech = this.PositionTechnique;
if (_gpos != null && len > 1 && posTech == PositionTechnique.OpenFont)
{
_gpos.DoGlyphPosition(_glyphPositions);
}
//----------------------------------------------
//at this point, all position is layout at original scale ***
//then we will scale it to target scale later
//----------------------------------------------
}