public object Process(object asset, AssetInfo info)
{
if (asset == null)
{
throw new ArgumentNullException(nameof(asset));
}
if (info == null)
{
throw new ArgumentNullException(nameof(info));
}
var sprite = (IReadOnlyTexture <byte>)asset;
var layout = SpriteSheetUtil.ArrangeSpriteSheet(sprite.Regions.Count, 1, sprite.GetRegionBuffer);
var totalHeight = ApiUtil.NextPowerOfTwo(layout.Height);
byte[] pixelData = new byte[layout.Width * totalHeight];
var subImages = new Region[sprite.Regions.Count];
for (int n = 0; n < sprite.Regions.Count; n++)
{
var frame = sprite.GetRegionBuffer(n);
var destWidth = frame.Width + 2 * MarginPixels;
var destHeight = frame.Height + 2 * MarginPixels;
var(x, y) = layout.Positions[n];
for (int j = 0; j < destHeight; j++)
{
for (int i = 0; i < destWidth; i++)
{
var sourceX = Math.Clamp(i - MarginPixels, 0, frame.Width - 1);
var sourceY = Math.Clamp(j - MarginPixels, 0, frame.Height - 1);
int src = sourceX + sourceY * sprite.Width;
int dest = x + i + (y + j) * layout.Width;
byte pixel = frame.Buffer[src];
pixelData[dest] = pixel;
}
}
subImages[n] = new Region(
new Vector2(x + MarginPixels, y + MarginPixels),
new Vector2(frame.Width, frame.Height),
new Vector2(layout.Width, totalHeight),
0);
}
return(new SimpleTexture <byte>(
info.AssetId, sprite.Id.ToString(),
layout.Width, totalHeight,
pixelData,
subImages));
}
public static Image <Rgba32> PackSpriteSheet(uint[] palette, int frameCount, GetFrameDelegate <byte> getFrame)
{
var layout = SpriteSheetUtil.ArrangeSpriteSheet(frameCount, 0, getFrame);
Image <Rgba32> image = new Image <Rgba32>(layout.Width, layout.Height);
if (!image.TryGetSinglePixelSpan(out var rgbaSpan))
{
throw new InvalidOperationException("Could not retrieve single span from Image");
}
Span <uint> pixels = MemoryMarshal.Cast <Rgba32, uint>(rgbaSpan);
for (var i = 0; i < frameCount; i++)
{
var frame = getFrame(i);
var(toX, toY) = layout.Positions[i];
var target = pixels[(toX + toY * layout.Width)..];
