internal static SKTextBlob CreatePathPositioned(void *text, int length, SKTextEncoding encoding, SKFont font, SKPath path, SKTextAlign textAlign = SKTextAlign.Left, SKPoint origin = default)
{
if (font == null)
{
throw new ArgumentNullException(nameof(font));
}
var count = font.CountGlyphs(text, length, encoding);
if (count <= 0)
{
return(null);
}
// we use temporary arrays because we might only use part of the text
using var glyphs = Utils.RentArray <ushort> (count);
using var glyphWidths = Utils.RentArray <float> (glyphs.Length);
using var glyphOffsets = Utils.RentArray <SKPoint> (glyphs.Length);
font.GetGlyphs(text, length, encoding, glyphs);
font.GetGlyphWidths(glyphs, glyphWidths, Span <SKRect> .Empty);
font.GetGlyphPositions(glyphs, glyphOffsets, origin);
using var builder = new SKTextBlobBuilder();
builder.AddPathPositionedRun(glyphs, font, glyphWidths, glyphOffsets, path, textAlign);
return(builder.Build());
}
internal static SKTextBlob CreateHorizontal(void *text, int length, SKTextEncoding encoding, SKFont font, ReadOnlySpan <float> positions, float y)
{
if (font == null)
{
throw new ArgumentNullException(nameof(font));
}
var count = font.CountGlyphs(text, length, encoding);
if (count <= 0)
{
return(null);
}
using var builder = new SKTextBlobBuilder();
var buffer = builder.AllocateHorizontalRun(font, count, y);
font.GetGlyphs(text, length, encoding, buffer.GetGlyphSpan());
positions.CopyTo(buffer.GetPositionSpan());
return(builder.Build());
}
internal static SKTextBlob Create(void *text, int length, SKTextEncoding encoding, SKFont font, SKPoint origin)
{
if (font == null)
{
throw new ArgumentNullException(nameof(font));
}
var count = font.CountGlyphs(text, length, encoding);
if (count <= 0)
{
return(null);
}
using var builder = new SKTextBlobBuilder();
var buffer = builder.AllocatePositionedRun(font, count);
font.GetGlyphs(text, length, encoding, buffer.GetGlyphSpan());
font.GetGlyphPositions(buffer.GetGlyphSpan(), buffer.GetPositionSpan(), origin);
return(builder.Build());
}