public override unsafe int GetHashCode()
{
fixed(VertexPositionNormalDiffuseTexture *self = &this)
{
return(FNV1A.Hash((IntPtr)self, sizeof(float) * 8));
}
}
public override Point MeasureString(string fontName, float size, string text)
{
if (string.IsNullOrEmpty(text))
{
return(Point.Zero);
}
if (string.IsNullOrEmpty(fontName))
{
throw new InvalidOperationException("fontName null");
}
int fontHash = FNV1A.Hash(fontName);
for (int i = 0; i < measures.Count; i++)
{
if (measures[i].IsEqual(text, fontHash, size))
{
return(measures[i].Measured);
}
}
using var textConv = new UTF8ZHelper(stackalloc byte[256], text);
using var fontConv = new UTF8ZHelper(stackalloc byte[256], fontName);
fixed(byte *tC = &textConv.ToUTF8Z().GetPinnableReference(),
tF = &fontConv.ToUTF8Z().GetPinnableReference())
{
pg_measurestring(ctx, (IntPtr)tC, (IntPtr)tF, size * (96.0f / 72.0f), out var width, out var height);
var p = new Point((int)width, (int)height);
measures.Enqueue(new MeasureResults()
{
Text = text, Font = fontHash, Size = size, Measured = p
});
return(p);
}
}
public override float LineHeight(string fontName, float size)
{
if (string.IsNullOrEmpty(fontName))
{
throw new InvalidOperationException("LineHeight fontName cannot be null");
}
int fontHash = FNV1A.Hash(fontName);
for (int i = 0; i < lineHeights.Count; i++)
{
if (lineHeights[i].Hash == fontHash && Math.Abs(lineHeights[i].Size - size) < 0.001f)
{
return(lineHeights[i].LineHeight);
}
}
using var fontConv = new UTF8ZHelper(stackalloc byte[256], fontName);
fixed(byte *tF = &fontConv.ToUTF8Z().GetPinnableReference())
{
var retval = pg_lineheight(ctx, (IntPtr)tF, size * (96.0f / 72.0f));
lineHeights.Enqueue(new HeightResult()
{
Hash = fontHash, Size = size, LineHeight = retval
});
return(retval);
}
}
public unsafe int MakeHash(string fontName, string text)
{
fixed(StringInfo *si = &this)
{
return(FNV1A.Hash((IntPtr)si, sizeof(StringInfo),
FNV1A.Hash(text, FNV1A.Hash(fontName))));
}
}