public Image <Rgba32> ToImage(int subImage, uint[] palette)
{
GetSubImageOffset(subImage, out var width, out var height, out var offset, out var stride);
Rgba32[] rgbaPixels = new Rgba32[width * height];
unsafe
{
fixed(Rgba32 *pixelPtr = rgbaPixels)
{
ReadOnlySpan <byte> fromSlice = TextureData.Slice(offset, width + (height - 1) * stride);
var from = new ReadOnlyByteImageBuffer((uint)width, (uint)height, (uint)stride, fromSlice);
Span <uint> toBuffer = new Span <uint>((uint *)pixelPtr, rgbaPixels.Length);
var to = new UIntImageBuffer((uint)width, (uint)height, width, toBuffer);
CoreUtil.Blit8To32(from, to, palette, 255, 0);
}
}
Image <Rgba32> image = new Image <Rgba32>(width, height);
image.Frames.AddFrame(rgbaPixels);
image.Frames.RemoveFrame(0);
return(image);
}
public Image <Rgba32> ToImage(uint[] palette)
{
var totalPixels = SubImages.Sum(x => (long)x.Size.X * (long)x.Size.Y);
var width = Math.Max((int)Math.Sqrt(totalPixels), SubImages.Max(x => (int)x.Size.X));
width = ApiUtil.NextPowerOfTwo(width);
// First arrange to determine required size and positions, then create the image.
var positions = new Dictionary <int, (int, int)>();
int rowHeight = 0;
int curX = 0, curY = 0;
for (var index = 0; index < SubImages.Count; index++)
{
var si = SubImages[index];
int w = (int)si.Size.X;
int h = (int)si.Size.Y;
if (width - (curX + w) >= 0) // Still room left on this row
{
positions[index] = (curX, curY);
curX += w;
if (h > rowHeight)
{
rowHeight = h;
}
}
else // Start a new row
{
curY += rowHeight;
rowHeight = h;
positions[index] = (0, curY);
curX = w;
}
}
if (curX > 0)
{
curY += rowHeight;
}
var height = curY;
Rgba32[] rgbaPixels = new Rgba32[width * height];
unsafe
{
fixed(Rgba32 *pixelPtr = rgbaPixels)
{
for (var index = 0; index < SubImages.Count; index++)
{
GetSubImageOffset(index, out var siw, out var sih, out var offset, out var stride);
ReadOnlySpan <byte> fromSlice = TextureData.Slice(offset, siw + (sih - 1) * stride);
var from = new ReadOnlyByteImageBuffer((uint)siw, (uint)sih, (uint)stride, fromSlice);
var(toX, toY) = positions[index];
Span <uint> toBuffer = new Span <uint>((uint *)pixelPtr, rgbaPixels.Length);
toBuffer = toBuffer.Slice(toX + toY * width);
var to = new UIntImageBuffer((uint)siw, (uint)sih, width, toBuffer);
CoreUtil.Blit8To32(from, to, palette, 255, 0);
}
}
}
Image <Rgba32> image = new Image <Rgba32>(width, height);
image.Frames.AddFrame(rgbaPixels);
image.Frames.RemoveFrame(0);
return(image);
}
