public GlyphMetrics[] GetGlyphMetrics(MyScript.IInk.Text.Text text, TextSpan[] spans)
{
CanvasDevice canvasDevice = CanvasDevice.GetSharedDevice();
GlyphMetrics[] glyphMetrics = new GlyphMetrics[text.GlyphCount];
var firstStyle = spans[0].Style;
var firstFontKey = FontKeyFromStyle(firstStyle);
if (text.GlyphCount == 1)
{
glyphMetrics[0] = GetGlyphMetrics(firstFontKey, text.Label, canvasDevice);
}
else
{
var textFormat = new CanvasTextFormat()
{
FontSize = firstFontKey.FontSize,
FontFamily = firstFontKey.FontFamily,
FontStyle = firstFontKey.FontStyle,
FontWeight = firstFontKey.FontWeight,
WordWrapping = CanvasWordWrapping.NoWrap,
Options = UseColorFont ? CanvasDrawTextOptions.EnableColorFont : CanvasDrawTextOptions.Default
};
using (var canvasTextLayout = new CanvasTextLayout(canvasDevice, text.Label, textFormat, 0.0f, 0.0f))
{
for (int i = 0; i < spans.Length; ++i)
{
var charIndex = text.GetGlyphBeginAt(spans[i].BeginPosition);
var charCount = text.GetGlyphEndAt(spans[i].EndPosition - 1) - charIndex;
var style = spans[i].Style;
var fontKey = FontKeyFromStyle(style);
canvasTextLayout.SetFontFamily(charIndex, charCount, fontKey.FontFamily);
canvasTextLayout.SetFontSize(charIndex, charCount, fontKey.FontSize);
canvasTextLayout.SetFontWeight(charIndex, charCount, fontKey.FontWeight);
canvasTextLayout.SetFontStyle(charIndex, charCount, fontKey.FontStyle);
}
for (int i = 0; i < text.GlyphCount; ++i)
{
var glyphLabel = text.GetGlyphLabelAt(i);
var glyphCharStart = text.GetGlyphBeginAt(i);
var glyphCharEnd = text.GetGlyphEndAt(i);
var glyphFontKey = new FontKey(canvasTextLayout.GetFontFamily(glyphCharStart)
, canvasTextLayout.GetFontSize(glyphCharStart)
, canvasTextLayout.GetFontWeight(glyphCharStart)
, canvasTextLayout.GetFontStyle(glyphCharStart));
var glyphMetrics_ = GetGlyphMetrics(glyphFontKey, glyphLabel, canvasDevice);
// Find cluster associated to element
// (Use of ClusterMetrics to identify ligatures in the CanvasTextLayout)
int cluster = -1;
int clusterCharStart = 0;
if (canvasTextLayout.ClusterMetrics != null)
{
for (int c = 0; c < canvasTextLayout.ClusterMetrics.Length; ++c)
{
var clusterCharCount = canvasTextLayout.ClusterMetrics[c].CharacterCount;
if ((glyphCharStart >= clusterCharStart) && (glyphCharStart < (clusterCharStart + clusterCharCount)))
{
cluster = c;
break;
}
clusterCharStart += clusterCharCount;
}
}
if ((i > 0) && (cluster >= 0) && (glyphCharStart > clusterCharStart))
{
// Ligature with the previous glyph
// The position is not accurate because of glyphs substitution at rendering
// but it makes the illusion.
var prevGlyphMetrics = glyphMetrics[i - 1];
glyphMetrics_.BoundingBox.X = prevGlyphMetrics.BoundingBox.X
+ prevGlyphMetrics.BoundingBox.Width
+ prevGlyphMetrics.RightSideBearing
+ glyphMetrics_.LeftSideBearing;
}
else
{
float glyphX = 0.0f;
var charRegions = canvasTextLayout.GetCharacterRegions(glyphCharStart, glyphCharEnd - glyphCharStart);
if ((charRegions != null) && (charRegions.Length > 0))
{
glyphX = (float)charRegions[0].LayoutBounds.X;
}
else
{
var glyphPos = canvasTextLayout.GetCaretPosition(glyphCharStart, false);
glyphX = (float)glyphPos.X;
}
glyphMetrics_.BoundingBox.X += px2mm(glyphX, dpiX);
}
glyphMetrics[i] = glyphMetrics_;
}
}
}
return(glyphMetrics);
}
