public IList <IKanvasImage> Load(Stream input)
{
using var br = new BinaryReaderX(input);
// Read chunks
var chunks = ReadSections(br);
// Flatten chunks
var infChunk = chunks.FirstOrDefault(x => x.sectionMagic == "TXIF");
var dataChunks = chunks.Where(x => x.sectionMagic == "TXIM").ToArray();
var tx4iChunk = chunks.FirstOrDefault(x => x.sectionMagic == "TX4I");
var paletteChunk = chunks.FirstOrDefault(x => x.sectionMagic == "TXPL");
// Read information chunk
using var infBr = new BinaryReaderX(new MemoryStream(infChunk.data));
var texInfo = infBr.ReadType <ChnkInfo>();
// Detect index depth by data length and palette size
var paddedWidth = ChnkSupport.ToPowerOfTwo(texInfo.width);
var bitDepth = texInfo.dataSize * 8 / paddedWidth / texInfo.height;
// Detect image format
var imageFormat = -1;
if (tx4iChunk == null)
{
switch (bitDepth)
{
case 2:
imageFormat = 2;
break;
case 4:
imageFormat = 3;
break;
case 8:
switch (paletteChunk.data.Length / 2)
{
case 8: imageFormat = 6; break;
case 32: imageFormat = 1; break;
case 256: imageFormat = 4; break;
}
break;
case 16:
imageFormat = 7;
break;
}
}
// Create image info
var result = new List <IKanvasImage>();
if (imageFormat != -1)
{
var definition = ChnkSupport.GetEncodingDefinition();
foreach (var dataChunk in dataChunks)
{
var imageInfo = new ImageInfo(dataChunk.data, imageFormat, new Size(texInfo.width, texInfo.height));
if (imageFormat < 7)
{
imageInfo.PaletteData = paletteChunk.data;
imageInfo.PaletteFormat = 0;
}
imageInfo.PadSize.Width.ToPowerOfTwo();
result.Add(new KanvasImage(definition, imageInfo));
}
}
else
{
// Expand TX4I data to RGBA8888
foreach (var dataChunk in dataChunks)
{
result.Add(new BitmapKanvasImage(ExpandTX4I(dataChunk.data, tx4iChunk.data, paletteChunk.data)
.ToBitmap(new Size(texInfo.width, texInfo.height), new Size(paddedWidth, texInfo.height),
new BcSwizzle(new SwizzlePreparationContext(new Rgba(8, 8, 8, 8), new Size(paddedWidth, texInfo.height))), ImageAnchor.TopLeft)));
}
}
return(result);
}
public ChnkState()
{
_img = new Chnk();
EncodingDefinition = ChnkSupport.GetEncodingDefinition();
}
