//experiment
/// <summary>
/// build a multi-layer glyph (eg. Emoji)
/// </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, IMultiLayerGlyphTranslator tx)
{
//1. current typeface support multilayer or not
if (builder.HasColorInfo)
{
Typeface typeface = builder.Typeface;
COLR colrTable = typeface.COLRTable;
CPAL cpalTable = typeface.CPALTable;
if (colrTable.LayerIndices.TryGetValue(glyphIndex, out ushort colorLayerStart))
{
//has color information on this glyphIndex
ushort colorLayerCount = colrTable.LayerCounts[glyphIndex];
tx.HasColorInfo(colorLayerCount);
for (int c = colorLayerStart; c < colorLayerStart + colorLayerCount; ++c)
{
ushort gIndex = colrTable.GlyphLayers[c];
tx.BeginSubGlyph(gIndex); //BEGIN SUB GLYPH
int palette = 0; // FIXME: assume palette 0 for now
cpalTable.GetColor(
cpalTable.Palettes[palette] + colrTable.GlyphPalettes[c], //index
out byte r, out byte g, out byte b, out byte a);
tx.SetFillColor(r, g, b, a); //SET COLOR
builder.BuildFromGlyphIndex(glyphIndex, sizeInPoints);
builder.ReadShapes(tx);
tx.EndSubGlyph(gIndex);//END SUB GLYPH
}
}
else
{
//build as normal glyph
builder.BuildFromGlyphIndex(glyphIndex, sizeInPoints);
tx.HasColorInfo(0);
builder.ReadShapes(tx);
}
}
else
{
//build as normal glyph
builder.BuildFromGlyphIndex(glyphIndex, sizeInPoints);
tx.HasColorInfo(0);
builder.ReadShapes(tx);
}
}
} // End Function GetExistingOrCreateGraphicsPath
// public override void DrawFromGlyphPlans(GlyphPlanSequence glyphPlanList, int startAt, int len, float left, float top)
public override void DrawFromGlyphPlans(GlyphPlanSequence seq, int startAt, int len, float x, float y)
{
UpdateVisualOutputSettings();
//draw data in glyph plan
//3. render each glyph
float sizeInPoints = this.FontSizeInPoints;
float pxscale = _currentTypeface.CalculateScaleToPixelFromPointSize(sizeInPoints);
Typeface typeface = this.Typeface;
_glyphMeshCollections.SetCacheInfo(typeface, sizeInPoints, this.HintTechnique);
//this draw a single line text span***
SvgGraphics g = this.TargetGraphics;
float baseline = y;
GlyphPlanSequenceSnapPixelScaleLayout snapToPxScale =
new GlyphPlanSequenceSnapPixelScaleLayout(seq, startAt, len, pxscale);
COLR colrTable = typeface.COLRTable;
CPAL cpalTable = typeface.CPALTable;
bool canUseColorGlyph = EnableColorGlyph && colrTable != null && cpalTable != null;
while (snapToPxScale.Read())
{
ushort glyphIndex = snapToPxScale.CurrentGlyphIndex;
if (canUseColorGlyph && colrTable.LayerIndices.TryGetValue(glyphIndex, out ushort colorLayerStart))
{
ushort colorLayerCount = colrTable.LayerCounts[glyphIndex];
for (int c = colorLayerStart; c < colorLayerStart + colorLayerCount; ++c)
{
SvgPath path = GetExistingOrCreateGraphicsPath(colrTable.GlyphLayers[c]);
if (path == null)
{
#if DEBUG
System.Diagnostics.Debug.WriteLine("gdi_printer: no path?");
#endif
continue;
} // End if (path == null)
//then move pen point to the position we want to draw a glyph
float cx = (float)System.Math.Round(snapToPxScale.ExactX + x);
float cy = (float)System.Math.Floor(snapToPxScale.ExactY + baseline);
int palette = 0; // FIXME: assume palette 0 for now
cpalTable.GetColor(
cpalTable.Palettes[palette] + colrTable.GlyphPalettes[c], //index
out byte red, out byte green, out byte blue, out byte alpha);
g.TranslateTransform(cx, cy);
_fillBrush.Color = SvgColor.ToWebRgb(red, green, blue);
if (FillBackground)
{
g.FillPath(_fillBrush, path);
}
if (DrawOutline)
{
g.DrawPath(_outlinePen, path);
}
// and then we reset back
g.TranslateTransform(-cx, -cy);
} // Next c
}
else
{
SvgPath path = GetExistingOrCreateGraphicsPath(glyphIndex);
if (path == null)
{
#if DEBUG
System.Diagnostics.Debug.WriteLine("gdi_printer: no path?");
#endif
continue;
}
//------
//then move pen point to the position we want to draw a glyph
float cx = (float)System.Math.Round(snapToPxScale.ExactX + x);
float cy = (float)System.Math.Floor(snapToPxScale.ExactY + baseline);
g.TranslateTransform(cx, cy);
if (FillBackground)
{
g.FillPath(_fillBrush, path);
}
if (DrawOutline)
{
g.DrawPath(_outlinePen, path);
}
// and then we reset back
g.TranslateTransform(-cx, -cy);
} // End else
} // Whend
} // End Sub DrawFromGlyphPlans