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using System;
using System.IO;
using System.Text;
using BCnEncoder.Shared;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Advanced;
using SixLabors.ImageSharp.PixelFormats;
namespace BCnEncoder.Decoder
{
public class DecoderInputOptions {
/// <summary>
/// The DDS file format doesn't seem to have a standard for indicating whether a BC1 texture
/// includes 1bit of alpha. This option will assume that all Bc1 textures contain alpha.
/// If this option is false, but the dds header includes a DDPF_ALPHAPIXELS flag, alpha will be included.
/// Default is true.
/// </summary>
public bool ddsBc1ExpectAlpha = true;
}
public class DecoderOutputOptions {
/// <summary>
/// If true, when decoding from a format that only includes a red channel,
/// output pixels will have all colors set to the same value (greyscale). Default is true.
/// </summary>
public bool redAsLuminance = true;
}
/// <summary>
/// Decodes compressed files into Rgba format.
/// </summary>
public class BcDecoder
{
public DecoderOutputOptions OutputOptions { get; set; } = new DecoderOutputOptions();
public DecoderInputOptions InputOptions { get; set; } = new DecoderInputOptions();
private bool IsSupportedRawFormat(GlInternalFormat format)
{
switch (format)
{
case GlInternalFormat.GL_R8:
case GlInternalFormat.GL_RG8:
case GlInternalFormat.GL_RGB8:
case GlInternalFormat.GL_RGBA8:
return true;
default:
return false;
}
}
private bool IsSupportedRawFormat(DXGI_FORMAT format)
{
switch (format)
{
case DXGI_FORMAT.DXGI_FORMAT_R8_UNORM:
case DXGI_FORMAT.DXGI_FORMAT_R8G8_UNORM:
case DXGI_FORMAT.DXGI_FORMAT_R8G8B8A8_UNORM:
return true;
default:
return false;
}
}
private IBcBlockDecoder GetDecoder(GlInternalFormat format)
{
switch (format)
{
case GlInternalFormat.GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
return new Bc1NoAlphaDecoder();
case GlInternalFormat.GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
return new Bc1ADecoder();
case GlInternalFormat.GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
return new Bc2Decoder();
case GlInternalFormat.GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
return new Bc3Decoder();
case GlInternalFormat.GL_COMPRESSED_RED_RGTC1_EXT:
return new Bc4Decoder(OutputOptions.redAsLuminance);
case GlInternalFormat.GL_COMPRESSED_RED_GREEN_RGTC2_EXT:
return new Bc5Decoder();
case GlInternalFormat.GL_COMPRESSED_RGBA_BPTC_UNORM_ARB:
return new Bc7Decoder();
// TODO: Not sure what to do with SRGB input.
case GlInternalFormat.GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM_ARB:
return new Bc7Decoder();
default:
return null;
}
}
private IBcBlockDecoder GetDecoder(DXGI_FORMAT format, DdsHeader header)
{
switch (format)
{
case DXGI_FORMAT.DXGI_FORMAT_BC1_UNORM:
case DXGI_FORMAT.DXGI_FORMAT_BC1_UNORM_SRGB:
case DXGI_FORMAT.DXGI_FORMAT_BC1_TYPELESS:
if ((header.ddsPixelFormat.dwFlags & PixelFormatFlags.DDPF_ALPHAPIXELS) != 0) {
return new Bc1ADecoder();
}
else if(InputOptions.ddsBc1ExpectAlpha){
return new Bc1ADecoder();
}
else {
return new Bc1NoAlphaDecoder();
}
case DXGI_FORMAT.DXGI_FORMAT_BC2_UNORM:
case DXGI_FORMAT.DXGI_FORMAT_BC2_UNORM_SRGB:
case DXGI_FORMAT.DXGI_FORMAT_BC2_TYPELESS:
return new Bc2Decoder();
case DXGI_FORMAT.DXGI_FORMAT_BC3_UNORM:
case DXGI_FORMAT.DXGI_FORMAT_BC3_UNORM_SRGB:
case DXGI_FORMAT.DXGI_FORMAT_BC3_TYPELESS:
return new Bc3Decoder();
case DXGI_FORMAT.DXGI_FORMAT_BC4_UNORM:
case DXGI_FORMAT.DXGI_FORMAT_BC4_SNORM:
case DXGI_FORMAT.DXGI_FORMAT_BC4_TYPELESS:
return new Bc4Decoder(OutputOptions.redAsLuminance);
case DXGI_FORMAT.DXGI_FORMAT_BC5_UNORM:
case DXGI_FORMAT.DXGI_FORMAT_BC5_SNORM:
case DXGI_FORMAT.DXGI_FORMAT_BC5_TYPELESS:
return new Bc5Decoder();
case DXGI_FORMAT.DXGI_FORMAT_BC7_UNORM:
case DXGI_FORMAT.DXGI_FORMAT_BC7_UNORM_SRGB:
case DXGI_FORMAT.DXGI_FORMAT_BC7_TYPELESS:
return new Bc7Decoder();
default:
return null;
}
}
private IRawDecoder GetRawDecoder(GlInternalFormat format)
{
switch (format)
{
case GlInternalFormat.GL_R8:
return new RawRDecoder(OutputOptions.redAsLuminance);
case GlInternalFormat.GL_RG8:
return new RawRGDecoder();
case GlInternalFormat.GL_RGB8:
return new RawRGBDecoder();
case GlInternalFormat.GL_RGBA8:
return new RawRGBADecoder();
default:
return null;
}
}
private IRawDecoder GetRawDecoder(DXGI_FORMAT format)
{
switch (format)
{
case DXGI_FORMAT.DXGI_FORMAT_R8_UNORM:
return new RawRDecoder(OutputOptions.redAsLuminance);
case DXGI_FORMAT.DXGI_FORMAT_R8G8_UNORM:
return new RawRGDecoder();
case DXGI_FORMAT.DXGI_FORMAT_R8G8B8A8_UNORM:
return new RawRGBADecoder();
default:
return null;
}
}
/// <summary>
/// Read a Ktx or a Dds file from a stream and decode it.
/// </summary>
public Image<Rgba32> Decode(Stream inputStream) {
var position = inputStream.Position;
try {
if (inputStream is FileStream fs) {
var extension = Path.GetExtension(fs.Name).ToLower();
if (extension == ".ktx") {
KtxFile file = KtxFile.Load(inputStream);
return Decode(file);
}
else if (extension == ".dds") {
DdsFile file = DdsFile.Load(inputStream);
return Decode(file);
}
}
bool isDDS = false;
using (var br = new BinaryReader(inputStream, Encoding.UTF8, true)) {
var magic = br.ReadUInt32();
if (magic == 0x20534444U) {
isDDS = true;
}
}
inputStream.Seek(position, SeekOrigin.Begin);
if (isDDS) {
DdsFile dds = DdsFile.Load(inputStream);
return Decode(dds);
}
else {
KtxFile ktx = KtxFile.Load(inputStream);
return Decode(ktx);
}
}
catch (Exception) {
inputStream.Seek(position, SeekOrigin.Begin);
throw;
}
}
/// <summary>
/// Read a Ktx or a Dds file from a stream and decode it.
/// </summary>
public Image<Rgba32>[] DecodeAllMipMaps(Stream inputStream) {
var position = inputStream.Position;
try {
if (inputStream is FileStream fs) {
var extension = Path.GetExtension(fs.Name).ToLower();
if (extension == ".ktx") {
KtxFile file = KtxFile.Load(inputStream);
return DecodeAllMipMaps(file);
}
else if (extension == ".dds") {
DdsFile file = DdsFile.Load(inputStream);
return DecodeAllMipMaps(file);
}
}
bool isDDS = false;
using (var br = new BinaryReader(inputStream, Encoding.UTF8, true)) {
var magic = br.ReadUInt32();
if (magic == 0x20534444U) {
isDDS = true;
}
}
inputStream.Seek(position, SeekOrigin.Begin);
if (isDDS) {
DdsFile dds = DdsFile.Load(inputStream);
return DecodeAllMipMaps(dds);
}
else {
KtxFile ktx = KtxFile.Load(inputStream);
return DecodeAllMipMaps(ktx);
}
}
catch (Exception) {
inputStream.Seek(position, SeekOrigin.Begin);
throw;
}
}
/// <summary>
/// Read a KtxFile and decode it.
/// </summary>
public Image<Rgba32> Decode(KtxFile file)
{
if (IsSupportedRawFormat(file.Header.GlInternalFormat)) {
var decoder = GetRawDecoder(file.Header.GlInternalFormat);
var data = file.MipMaps[0].Faces[0].Data;
var pixelWidth = file.MipMaps[0].Width;
var pixelHeight = file.MipMaps[0].Height;
var image = new Image<Rgba32>((int)pixelWidth, (int)pixelHeight);
var output = decoder.Decode(data, (int)pixelWidth, (int)pixelHeight);
var pixels = image.GetPixelSpan();
output.CopyTo(pixels);
return image;
}
else {
var decoder = GetDecoder(file.Header.GlInternalFormat);
if (decoder == null)
{
throw new NotSupportedException($"This format is not supported: {file.Header.GlInternalFormat}");
}
var data = file.MipMaps[0].Faces[0].Data;
var pixelWidth = file.MipMaps[0].Width;
var pixelHeight = file.MipMaps[0].Height;
var blocks = decoder.Decode(data, (int)pixelWidth, (int)pixelHeight, out var blockWidth, out var blockHeight);
return ImageToBlocks.ImageFromRawBlocks(blocks, blockWidth, blockHeight,
(int)pixelWidth, (int)pixelHeight);
}
}
/// <summary>
/// Read a KtxFile and decode it.
/// </summary>
public Image<Rgba32>[] DecodeAllMipMaps(KtxFile file)
{
if (IsSupportedRawFormat(file.Header.GlInternalFormat)) {
var decoder = GetRawDecoder(file.Header.GlInternalFormat);
var images = new Image<Rgba32>[file.MipMaps.Count];
for (int mip = 0; mip < file.MipMaps.Count; mip++) {
var data = file.MipMaps[mip].Faces[0].Data;
var pixelWidth = file.MipMaps[mip].Width;
var pixelHeight = file.MipMaps[mip].Height;
var image = new Image<Rgba32>((int)pixelWidth, (int)pixelHeight);
var output = decoder.Decode(data, (int)pixelWidth, (int)pixelHeight);
var pixels = image.GetPixelSpan();
output.CopyTo(pixels);
images[mip] = image;
}
return images;
}
else {
var decoder = GetDecoder(file.Header.GlInternalFormat);
if (decoder == null)
{
throw new NotSupportedException($"This format is not supported: {file.Header.GlInternalFormat}");
}
var images = new Image<Rgba32>[file.MipMaps.Count];
for (int mip = 0; mip < file.MipMaps.Count; mip++) {
var data = file.MipMaps[mip].Faces[0].Data;
var pixelWidth = file.MipMaps[mip].Width;
var pixelHeight = file.MipMaps[mip].Height;
var blocks = decoder.Decode(data, (int) pixelWidth, (int) pixelHeight, out var blockWidth,
out var blockHeight);
var image = ImageToBlocks.ImageFromRawBlocks(blocks, blockWidth, blockHeight,
(int)pixelWidth, (int)pixelHeight);
images[mip] = image;
}
return images;
}
}
/// <summary>
/// Read a DdsFile and decode it
/// </summary>
public Image<Rgba32> Decode(DdsFile file)
{
if (IsSupportedRawFormat(file.Header.ddsPixelFormat.DxgiFormat)) {
var decoder = GetRawDecoder(file.Header.ddsPixelFormat.DxgiFormat);
var data = file.Faces[0].MipMaps[0].Data;
var pixelWidth = file.Faces[0].Width;
var pixelHeight = file.Faces[0].Height;
var image = new Image<Rgba32>((int)pixelWidth, (int)pixelHeight);
var output = decoder.Decode(data, (int)pixelWidth, (int)pixelHeight);
var pixels = image.GetPixelSpan();
output.CopyTo(pixels);
return image;
}
else {
DXGI_FORMAT format = DXGI_FORMAT.DXGI_FORMAT_UNKNOWN;
if (file.Header.ddsPixelFormat.IsDxt10Format) {
format = file.Dxt10Header.dxgiFormat;
}
else {
format = file.Header.ddsPixelFormat.DxgiFormat;
}
IBcBlockDecoder decoder = GetDecoder(format, file.Header);
if (decoder == null)
{
throw new NotSupportedException($"This format is not supported: {format}");
}
var data = file.Faces[0].MipMaps[0].Data;
var pixelWidth = file.Faces[0].Width;
var pixelHeight = file.Faces[0].Height;
var blocks = decoder.Decode(data, (int)pixelWidth, (int)pixelHeight, out var blockWidth, out var blockHeight);
return ImageToBlocks.ImageFromRawBlocks(blocks, blockWidth, blockHeight,
(int)pixelWidth, (int)pixelHeight);
}
}
/// <summary>
/// Read a DdsFile and decode it
/// </summary>
public Image<Rgba32>[] DecodeAllMipMaps(DdsFile file)
{
if (IsSupportedRawFormat(file.Header.ddsPixelFormat.DxgiFormat)) {
var decoder = GetRawDecoder(file.Header.ddsPixelFormat.DxgiFormat);
var images = new Image<Rgba32>[file.Header.dwMipMapCount];
for (int mip = 0; mip < file.Header.dwMipMapCount; mip++) {
var data = file.Faces[0].MipMaps[mip].Data;
var pixelWidth = file.Faces[0].MipMaps[mip].Width;
var pixelHeight = file.Faces[0].MipMaps[mip].Height;
var image = new Image<Rgba32>((int) pixelWidth, (int) pixelHeight);
var output = decoder.Decode(data, (int) pixelWidth, (int) pixelHeight);
var pixels = image.GetPixelSpan();
output.CopyTo(pixels);
images[mip] = image;
}
return images;
}
else {
DXGI_FORMAT format = DXGI_FORMAT.DXGI_FORMAT_UNKNOWN;
if (file.Header.ddsPixelFormat.IsDxt10Format) {
format = file.Dxt10Header.dxgiFormat;
}
else {
format = file.Header.ddsPixelFormat.DxgiFormat;
}
IBcBlockDecoder decoder = GetDecoder(format, file.Header);
if (decoder == null)
{
throw new NotSupportedException($"This format is not supported: {format}");
}
var images = new Image<Rgba32>[file.Header.dwMipMapCount];
for (int mip = 0; mip < file.Header.dwMipMapCount; mip++) {
var data = file.Faces[0].MipMaps[mip].Data;
var pixelWidth = file.Faces[0].MipMaps[mip].Width;
var pixelHeight = file.Faces[0].MipMaps[mip].Height;
var blocks = decoder.Decode(data, (int) pixelWidth, (int) pixelHeight, out var blockWidth,
out var blockHeight);
var image = ImageToBlocks.ImageFromRawBlocks(blocks, blockWidth, blockHeight,
(int)pixelWidth, (int)pixelHeight);
images[mip] = image;
}
return images;
}
}
}
}