public static NinePatchImage Create(Image source, double scale = 1)
{
if (source.Width < 3 || source.Height < 3)
{
throw new ArgumentOutOfRangeException(nameof(source));
}
var w = source.Width - 2;
var h = source.Height - 2;
var pixels = new byte[w * h * 4];
for (var y = 0; y < h; y++)
{
Array.Copy(source.Pixels, ((y + 1) * source.Width + 1) * 4, pixels, y * w * 4, w * 4);
}
var self = new Image(w, h, pixels);
if (scale != 1)
{
var resampler = new SuperSamplingSampler();
var inner = new Image(w, h, pixels);
w = Math.Max(3, (int)Math.Round((source.Width - 1) * scale));
h = Math.Max(3, (int)Math.Round((source.Height - 1) * scale));
self = resampler.Sample(inner, w, h);
}
return(new NinePatchImage(source, scale, self));
}
public NinePatchImage(ImageBase source, double scale = 1)
{
if (source.PixelWidth < 3)
{
throw new ArgumentOutOfRangeException(nameof(PixelWidth));
}
if (source.PixelHeight < 3)
{
throw new ArgumentOutOfRangeException(nameof(PixelHeight));
}
var maxX = source.PixelWidth - 1;
var maxY = source.PixelHeight - 1;
// Left/Right
for (var x = 1; x <= maxX; x++)
{
if (source[x, 0].A > 0)
{
Left = x - 1; break;
}
}
for (var x = 1; x <= maxX; x++)
{
if (source[maxX - x, 0].A > 0)
{
Right = x - 1; break;
}
}
// Top/Bottom
for (var y = 1; y <= maxY; y++)
{
if (source[0, y].A > 0)
{
Top = y - 1; break;
}
}
for (var y = 1; y <= maxY; y++)
{
if (source[0, maxY - y].A > 0)
{
Bottom = y - 1; break;
}
}
// PaddingLeft/PaddingRight
for (var x = 1; x <= maxX; x++)
{
if (source[x, maxY].A > 0)
{
PaddingLeft = x - 1; break;
}
}
for (var x = 1; x <= maxX; x++)
{
if (source[maxX - x, maxY].A > 0)
{
PaddingRight = x - 1; break;
}
}
// PaddingTop/PaddingBottom
for (var y = 1; y <= maxY; y++)
{
if (source[maxX, y].A > 0)
{
PaddingTop = y - 1; break;
}
}
for (var y = 1; y <= maxY; y++)
{
if (source[maxX, maxY - y].A > 0)
{
PaddingBottom = y - 1; break;
}
}
if (scale != 1)
{
Left = Math.Max(1, (int)Math.Round(Left * scale));
Right = Math.Max(1, (int)Math.Round(Right * scale));
Top = Math.Max(1, (int)Math.Round(Top * scale));
Bottom = Math.Max(1, (int)Math.Round(Bottom * scale));
PaddingLeft = Math.Max(1, (int)Math.Round(PaddingLeft * scale));
PaddingRight = Math.Max(1, (int)Math.Round(PaddingRight * scale));
PaddingTop = Math.Max(1, (int)Math.Round(PaddingTop * scale));
PaddingBottom = Math.Max(1, (int)Math.Round(PaddingBottom * scale));
}
var w = source.PixelWidth - 2;
var h = source.PixelHeight - 2;
var pixels = new byte[w * h * 4];
for (var y = 0; y < h; y++)
{
Array.Copy(source.Pixels, ((y + 1) * source.PixelWidth + 1) * 4, pixels, y * w * 4, w * 4);
}
SetPixels(w, h, pixels);
if (scale != 1)
{
var resampler = new SuperSamplingSampler();
var inner = new Image();
inner.SetPixels(w, h, pixels);
w = Math.Max(3, (int)Math.Round((source.PixelWidth - 1) * scale));
h = Math.Max(3, (int)Math.Round((source.PixelHeight - 1) * scale));
resampler.Sample(inner, this, w, h);
}
patches = new Lazy <IReadOnlyList <ImageBase> >(CreatePatches);
}