/// <summary>
/// Decode TGA Header.
/// </summary>
/// <param name="reader">Image stream.</param>
/// <param name="description">Image description.</param>
public unsafe void DecodeHeader(BinaryReader reader, out ImageDescription description)
{
KTXHeader header = ImageHelpers.ReadStruct <KTXHeader>(reader);
description = new ImageDescription()
{
imageFormat = ImageFormat.KTX,
Width = Math.Max(1, header.pixelWidth),
Height = Math.Max(1, header.pixelHeight),
Depth = Math.Max(1, header.pixelDepth),
MipLevels = Math.Max(1, header.numberOfMipmapLevels),
ArraySize = Math.Max(1, header.numberOfArrayElements),
Faces = Math.Max(1, header.numberOfFaces),
pixelFormat = SupportedFormats.FromOpenGLFormat(ref header),
};
}
/// <summary>
/// Decode TGA data.
/// </summary>
/// <param name="reader">Binary reader.</param>
/// <param name="databoxes">Databoxes array.</param>
/// <param name="description">Image Description.</param>
public void DecodeData(BinaryReader reader, out DataBox[] databoxes, out ImageDescription description)
{
KTXTexture texture = KTXTexture.Load(reader, true);
var header = texture.Header;
description = new ImageDescription()
{
imageFormat = ImageFormat.KTX,
Width = Math.Max(1, texture.Header.pixelWidth),
Height = Math.Max(1, texture.Header.pixelHeight),
Depth = Math.Max(1, texture.Header.pixelDepth),
MipLevels = Math.Max(1, texture.Header.numberOfMipmapLevels),
ArraySize = Math.Max(1, texture.Header.numberOfArrayElements),
Faces = Math.Max(1, header.numberOfFaces),
pixelFormat = SupportedFormats.FromOpenGLFormat(ref header),
};
databoxes = new DataBox[description.ArraySize * description.Faces * description.MipLevels];
for (int mipmapIndex = 0; mipmapIndex < texture.Mipmaps.Length; mipmapIndex++)
{
var level = texture.Mipmaps[mipmapIndex];
for (int sliceIndex = 0; sliceIndex < level.ArrayElements.Length; sliceIndex++)
{
var slice = level.ArrayElements[sliceIndex];
for (int faceIndex = 0; faceIndex < slice.Faces.Length; faceIndex++)
{
var face = slice.Faces[faceIndex];
uint formatSize = description.pixelFormat.GetSizeInBits() / 8;
uint rowPitch = (uint)level.Width * formatSize;
uint slicePitch = (uint)face.Data.Length;
int sliceIndexCalculated = (sliceIndex * slice.Faces.Length) + faceIndex;
int index = (sliceIndexCalculated * (int)description.MipLevels) + mipmapIndex;
databoxes[index] = new DataBox(face.Data, rowPitch, slicePitch);
}
}
}
}