public void GetOffset(int index, out short offsetX, out short offsetY)
{
GlyphPos pos = _glyphPosList[index];
offsetX = pos.xoffset;
offsetY = pos.yoffset;
}
public void AppendGlyphAdvance(int index, short appendAdvX, short appendAdvY)
{
GlyphPos pos = _glyphPosList[index];
pos.advanceW += appendAdvX;//TODO: review for appendY
_glyphPosList[index] = pos;
}
public ushort GetGlyph(int index, out ushort advW)
{
GlyphPos pos = _glyphPosList[index];
advW = (ushort)pos.advanceW;
return(pos.glyphIndex);
}
public void AppendGlyphOffset(int index, short appendOffsetX, short appendOffsetY)
{
GlyphPos existing = _glyphPosList[index];
existing.xoffset += appendOffsetX;
existing.yoffset += appendOffsetY;
_glyphPosList[index] = existing;
}
public ushort GetGlyph(int index, out short offsetX, out short offsetY, out short advW)
{
GlyphPos pos = _glyphs[index];
offsetX = pos.xoffset;
offsetY = pos.yoffset;
advW = pos.advanceW;
return(pos.glyphIndex);
}
public ushort GetGlyph(int index, out short inputOffset, out short offsetX, out short offsetY, out short advW)
{
GlyphPos pos = _glyphPosList[index];
offsetX = pos.xoffset;
offsetY = pos.yoffset;
advW = pos.advanceW;
inputOffset = pos.o_offset;
return(pos.glyphIndex);
}
/// <summary>
/// read latest layout output
/// </summary>
/// <param name="glyphLayout"></param>
/// <param name="readDel"></param>
public static void ReadOutput(this GlyphLayout glyphLayout, GlyphReadOutputDelegate readDel)
{
Typeface typeface = glyphLayout.Typeface;
List <GlyphPos> glyphPositions = glyphLayout._glyphPositions;
//3.read back
int finalGlyphCount = glyphPositions.Count;
int cx = 0;
short cy = 0;
PositionTechnique posTech = glyphLayout.PositionTechnique;
ushort prev_index = 0;
for (int i = 0; i < finalGlyphCount; ++i)
{
GlyphPos glyphPos = glyphPositions[i];
//----------------------------------
switch (posTech)
{
default: throw new NotSupportedException();
case PositionTechnique.None:
readDel(i, new GlyphPlan(glyphPos.glyphIndex, cx, cy, glyphPos.advWidth));
break;
case PositionTechnique.OpenFont:
readDel(i, new GlyphPlan(
glyphPos.glyphIndex,
cx + glyphPos.xoffset,
(short)(cy + glyphPos.yoffset),
glyphPos.advWidth));
break;
case PositionTechnique.Kerning:
if (i > 0)
{
cx += typeface.GetKernDistance(prev_index, glyphPos.glyphIndex);
}
readDel(i, new GlyphPlan(
prev_index = glyphPos.glyphIndex,
cx,
cy,
glyphPos.advWidth));
break;
}
cx += glyphPos.advWidth;
}
}
/// <summary>
/// read latest layout output into outputGlyphPlanList
/// </summary>
public static void ReadOutput(this GlyphLayout glyphLayout, List <GlyphPlan> outputGlyphPlanList)
{
GlyphPosStream glyphPositions = glyphLayout._glyphPositions; //from opentype's layout result,
int finalGlyphCount = glyphPositions.Count;
//------------------------
IPixelScaleLayout pxscaleLayout = glyphLayout.PxScaleLayout;
if (pxscaleLayout != null)
{
//use custom pixel scale layout engine
pxscaleLayout.SetFont(glyphLayout.Typeface, glyphLayout.FontSizeInPoints);
pxscaleLayout.Layout(glyphPositions, outputGlyphPlanList);
}
else
{
//default scale
float pxscale = glyphLayout.PixelScale;
double cx = 0;
short cy = 0;
for (int i = 0; i < finalGlyphCount; ++i)
{
GlyphPos glyph_pos = glyphPositions[i];
float advW = glyph_pos.advanceW * pxscale;
float exact_x = (float)(cx + glyph_pos.OffsetX * pxscale);
float exact_y = (float)(cy + glyph_pos.OffsetY * pxscale);
outputGlyphPlanList.Add(new GlyphPlan(
glyph_pos.glyphIndex,
exact_x,
exact_y,
advW));
cx += advW;
}
}
}
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;
}
}
