public static void DrawShapedText(this SKCanvas canvas, SKShaper shaper, string text, float x, float y, SKPaint paint)
{
if (canvas == null)
throw new ArgumentNullException(nameof(canvas));
if (shaper == null)
throw new ArgumentNullException(nameof(shaper));
if (text == null)
throw new ArgumentNullException(nameof(text));
if (paint == null)
throw new ArgumentNullException(nameof(paint));
if (string.IsNullOrEmpty(text))
return;
// shape the text
var result = shaper.Shape(text, x, y, paint);
// draw the text
using (var paintClone = paint.Clone())
{
paintClone.TextEncoding = SKTextEncoding.GlyphId;
paintClone.Typeface = shaper.Typeface;
var bytes = result.Codepoints.Select(cp => BitConverter.GetBytes((ushort)cp)).SelectMany(b => b).ToArray();
canvas.DrawPositionedText(bytes, result.Points, paintClone);
}
}
public static void DrawShapedText(this SKCanvas canvas, string text, float x, float y, SKPaint paint)
{
if (string.IsNullOrEmpty(text))
{
return;
}
using var shaper = new SKShaper(paint.GetFont().Typeface);
canvas.DrawShapedText(shaper, text, x, y, paint);
}
public static void DrawShapedText(this SKCanvas canvas, SKShaper shaper, string text, float x, float y, SKPaint paint)
{
if (string.IsNullOrEmpty(text))
{
return;
}
if (canvas == null)
{
throw new ArgumentNullException(nameof(canvas));
}
if (shaper == null)
{
throw new ArgumentNullException(nameof(shaper));
}
if (paint == null)
{
throw new ArgumentNullException(nameof(paint));
}
using var font = paint.ToFont();
font.Typeface = shaper.Typeface;
// shape the text
var result = shaper.Shape(text, x, y, paint);
// create the text blob
using var builder = new SKTextBlobBuilder();
var run = builder.AllocatePositionedRun(font, result.Codepoints.Length);
// copy the glyphs
var g = run.GetGlyphSpan();
var p = run.GetPositionSpan();
for (var i = 0; i < result.Codepoints.Length; i++)
{
g[i] = (ushort)result.Codepoints[i];
p[i] = result.Points[i];
}
// build
using var textBlob = builder.Build();
// draw the text
canvas.DrawText(textBlob, 0, 0, paint);
}
public static void DrawShapedText(this SKCanvas canvas, SKShaper shaper, string text, SKPoint p, SKPaint paint) => canvas.DrawShapedText(shaper, text, p.X, p.Y, paint);
