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)..];
public static SpriteSheetLayout ArrangeSpriteSheet <T>(int frameCount, int margin, GetFrameDelegate <T> getFrame)
{
long totalPixels = 0;
int width = 0;
for (int i = 0; i < frameCount; i++)
{
var frame = getFrame(i);
totalPixels += (frame.Width + 2 * margin) * (frame.Height + 2 * margin);
if (width < frame.Width)
{
width = frame.Width;
}
}
int sqrtTotal = (int)Math.Sqrt(totalPixels);
if (sqrtTotal > width)
{
width = sqrtTotal;
}
width = ApiUtil.NextPowerOfTwo(width);
// First arrange to determine required size and positions, then create the image.
var positions = new (int, int)[frameCount];