protected ClusterFit(ColourSet colours, SquishOptions flags) : base(colours, flags)
{
// Set the iteration count.
this._IterationCount = flags.HasFlag(SquishOptions.ColourIterativeClusterFit) ? MaxIterations : 1;
// Initialise the best error.
this._BestError = new Vector4(float.MaxValue);
// Initialize the metric
var perceptual = flags.HasFlag(SquishOptions.ColourMetricPerceptual);
if (perceptual)
{
this._Metric = new Vector4(0.2126f, 0.7152f, 0.0722f, 0.0f);
}
else
{
this._Metric = new Vector4(1.0f);
}
// Get the covariance matrix.
var covariance = Sym3x3.ComputeWeightedCovariance(colours.Count, colours.Points, colours.Weights);
// Compute the principle component
this._Principle = Sym3x3.ComputePrincipledComponent(covariance);
}
public static byte[] CompressBlockMasked(byte[] rgba, int mask, SquishOptions flags)
{
flags = flags.FixFlags();
ColourSet colours = new ColourSet(rgba, mask, flags);
if (colours.Count == 1)
{
// Always do a single colour fit
//SingleColourFit fit = new SingleColourFit(ref colours, flags);
}
else if (flags.HasFlag(SquishOptions.ColourRangeFit) || colours.Count == 0)
{
// Do a range fit
//RangeFit fit = new RangeFit(ref colours, flags, metric);
}
else
{
// Default to a cluster fit (could be iterative or not)
//ClusterFit fit = new ClusterFit(ref colours, flags, metric);
}
// Compress alpha separately if needed
if (flags.HasFlag(SquishOptions.DXT3))
{
//Alpha.CompressAlphaDxt3(rgba, mask, alphaBlock);
}
else if (flags.HasFlag(SquishOptions.DXT5))
{
//Alpha.CompressAlphaDxt5(rgba, mask, alphaBlock);
}
throw new NotImplementedException();
}
public static byte[] DecompressBlock(byte[] block, int blockOffset, SquishOptions flags)
{
// Get the block locations
var colOff = blockOffset;
var alphaOff = blockOffset;
if ((flags & (SquishOptions.DXT3 | SquishOptions.DXT5)) != 0)
{
colOff += 8;
}
// Decompress colour.
var rgba = ColourBlock.DecompressColour(block, colOff, flags.HasFlag(SquishOptions.DXT1));
// Decompress alpha seperately if necessary.
if (flags.HasFlag(SquishOptions.DXT3))
{
Alpha.DecompressAlphaDxt3(block, alphaOff, rgba, 0);
}
else if (flags.HasFlag(SquishOptions.DXT5))
{
Alpha.DecompressAlphaDxt5(block, alphaOff, rgba, 0);
}
return rgba;
}
public static byte[] CompressBlockMasked(byte[] rgba, int mask, SquishOptions flags)
{
flags = flags.FixFlags();
ColourSet colours = new ColourSet(rgba, mask, flags);
if (colours.Count == 1)
{
// Always do a single colour fit
//SingleColourFit fit = new SingleColourFit(ref colours, flags);
}
else if (flags.HasFlag(SquishOptions.ColourRangeFit) || colours.Count == 0)
{
// Do a range fit
//RangeFit fit = new RangeFit(ref colours, flags, metric);
}
else
{
// Default to a cluster fit (could be iterative or not)
//ClusterFit fit = new ClusterFit(ref colours, flags, metric);
}
// Compress alpha separately if needed
if (flags.HasFlag(SquishOptions.DXT3))
{
//Alpha.CompressAlphaDxt3(rgba, mask, alphaBlock);
}
else if (flags.HasFlag(SquishOptions.DXT5))
{
//Alpha.CompressAlphaDxt5(rgba, mask, alphaBlock);
}
throw new NotImplementedException();
}
public static byte[] DecompressBlock(byte[] block, int blockOffset, SquishOptions flags)
{
// Get the block locations
var colOff = blockOffset;
var alphaOff = blockOffset;
if ((flags & (SquishOptions.DXT3 | SquishOptions.DXT5)) != 0)
{
colOff += 8;
}
// Decompress colour.
var rgba = ColourBlock.DecompressColour(block, colOff, flags.HasFlag(SquishOptions.DXT1));
// Decompress alpha seperately if necessary.
if (flags.HasFlag(SquishOptions.DXT3))
{
Alpha.DecompressAlphaDxt3(block, alphaOff, rgba, 0);
}
else if (flags.HasFlag(SquishOptions.DXT5))
{
Alpha.DecompressAlphaDxt5(block, alphaOff, rgba, 0);
}
return(rgba);
}
protected ClusterFit(ColourSet colours, SquishOptions flags)
: base(colours, flags)
{
// Set the iteration count.
this._IterationCount = flags.HasFlag(SquishOptions.ColourIterativeClusterFit) ? MaxIterations : 1;
// Initialise the best error.
this._BestError = new Vector4(float.MaxValue);
// Initialize the metric
var perceptual = flags.HasFlag(SquishOptions.ColourMetricPerceptual);
if (perceptual)
{
this._Metric = new Vector4(0.2126f, 0.7152f, 0.0722f, 0.0f);
}
else
{
this._Metric = new Vector4(1.0f);
}
// Get the covariance matrix.
var covariance = Sym3x3.ComputeWeightedCovariance(colours.Count, colours.Points, colours.Weights);
// Compute the principle component
this._Principle = Sym3x3.ComputePrincipledComponent(covariance);
}
public static int GetStorageRequirements(int width, int height, SquishOptions flags)
{
var blockCount = ((width + 3) / 4) * ((height + 3) / 4);
var blockSize = flags.HasFlag(SquishOptions.DXT1) ? 8 : 16;
return(blockCount * blockSize);
}
public static Image <Rgba32> DecompressToImage(byte[] blocks, int offset, int width, int height, SquishOptions flags)
{
var result = new Image <Rgba32>(width, height);
var bufferOffset = 0;
var bytesPerBlock = flags.HasFlag(SquishOptions.DXT1) ? 8 : 16;
var blockOffset = offset;
// Loop over blocks.
for (var y = 0; y < height; y += 4)
{
for (var x = 0; x < width; x += 4)
{
// Decompress the block.
var targetRgba = DecompressBlock(blocks, blockOffset, flags);
// Write the decompressed pixels to the correct image locations.
var sourcePixelOffset = 0;
for (var py = 0; py < 4; ++py)
{
for (var px = 0; px < 4; ++px)
{
// Get the target location.
var sx = x + px;
var sy = y + py;
if (sx < width && sy < height)
{
var sourceColour = new Rgba32
(
targetRgba[sourcePixelOffset + 0],
targetRgba[sourcePixelOffset + 1],
targetRgba[sourcePixelOffset + 2],
targetRgba[sourcePixelOffset + 3]
);
result[sx, sy] = sourceColour;
/*
* var i = 4 * (sx + (sy * width));
* fullBuffer[bufferOffset + i + 0] = targetRgba[sourcePixelOffset + 2];
* fullBuffer[bufferOffset + i + 1] = targetRgba[sourcePixelOffset + 1];
* fullBuffer[bufferOffset + i + 2] = targetRgba[sourcePixelOffset + 0];
* fullBuffer[bufferOffset + i + 3] = targetRgba[sourcePixelOffset + 3];
*/
}
sourcePixelOffset += 4; // Skip this pixel as it is outside the image.
}
}
// advance
blockOffset += bytesPerBlock;
}
}
return(result);
}
public static unsafe Image DecompressToBitmap(byte[] blocks, int offset, int width, int height, SquishOptions flags)
{
var fullBuffer = new byte[4 * width * height];
var bufferOffset = 0;
var bytesPerBlock = flags.HasFlag(SquishOptions.DXT1) ? 8 : 16;
var blockOffset = offset;
// Loop over blocks.
for (int y = 0; y < height; y += 4)
{
for (int x = 0; x < width; x += 4)
{
// Decompress the block.
var targetRgba = DecompressBlock(blocks, blockOffset, flags);
// Write the decompressed pixels to the correct image locations.
var sourcePixelOffset = 0;
for (int py = 0; py < 4; ++py)
{
for (int px = 0; px < 4; ++px)
{
// Get the target location.
var sx = x + px;
var sy = y + py;
if (sx < width && sy < height)
{
var i = 4 * (sx + (sy * width));
fullBuffer[bufferOffset + i + 0] = targetRgba[sourcePixelOffset + 2];
fullBuffer[bufferOffset + i + 1] = targetRgba[sourcePixelOffset + 1];
fullBuffer[bufferOffset + i + 2] = targetRgba[sourcePixelOffset + 0];
fullBuffer[bufferOffset + i + 3] = targetRgba[sourcePixelOffset + 3];
}
sourcePixelOffset += 4; // Skip this pixel as it is outside the image.
}
}
// advance
blockOffset += bytesPerBlock;
}
}
Image ret;
fixed(byte *p = fullBuffer)
{
var ptr = (IntPtr)p;
var tempImage = new Bitmap(width, height, 4 * width, System.Drawing.Imaging.PixelFormat.Format32bppArgb, ptr);
ret = new Bitmap(tempImage);
}
return(ret);
}
public void Compress(ref byte[] block)
{
if (_Flags.HasFlag(SquishOptions.DXT1))
{
Compress3(block);
if (!_Colours.IsTransparent)
{
Compress4(block);
}
}
else
{
Compress4(block);
}
}
public static byte[] DecompressImage(byte[] blocks, int offset, int width, int height, SquishOptions flags)
{
var argb = new byte[4 * width * height];
var bytesPerBlock = flags.HasFlag(SquishOptions.DXT1) ? 8 : 16;
var blockOffset = offset;
// Loop over blocks.
for (int y = 0; y < height; y += 4)
{
for (int x = 0; x < width; x += 4)
{
// Decompress the block.
var targetRgba = DecompressBlock(blocks, blockOffset, flags);
// Write the decompressed pixels to the correct image locations.
var sourcePixelOffset = 0;
for (int py = 0; py < 4; ++py)
{
for (int px = 0; px < 4; ++px)
{
// Get the target location.
var sx = x + px;
var sy = y + py;
if (sx < width && sy < height)
{
var targetPixelOffset = 4 * ((width * sy) + sx);
// Copy the rgba value
argb[targetPixelOffset + 0] = targetRgba[sourcePixelOffset + 2];
argb[targetPixelOffset + 1] = targetRgba[sourcePixelOffset + 1];
argb[targetPixelOffset + 2] = targetRgba[sourcePixelOffset + 0];
argb[targetPixelOffset + 3] = targetRgba[sourcePixelOffset + 3];
}
sourcePixelOffset += 4;
}
}
// advance
blockOffset += bytesPerBlock;
}
}
return(argb);
}
public static byte[] DecompressImage(byte[] blocks, int offset, int width, int height, SquishOptions flags)
{
var argb = new byte[4 * width * height];
var bytesPerBlock = flags.HasFlag(SquishOptions.DXT1) ? 8 : 16;
var blockOffset = offset;
// Loop over blocks.
for (int y = 0; y < height; y += 4) {
for (int x = 0; x < width; x += 4) {
// Decompress the block.
var targetRgba = DecompressBlock(blocks, blockOffset, flags);
// Write the decompressed pixels to the correct image locations.
var sourcePixelOffset = 0;
for (int py = 0; py < 4; ++py) {
for (int px = 0; px < 4; ++px) {
// Get the target location.
var sx = x + px;
var sy = y + py;
if (sx < width && sy < height) {
var targetPixelOffset = 4 * ((width * sy) + sx);
// Copy the rgba value
argb[targetPixelOffset + 0] = targetRgba[sourcePixelOffset + 2];
argb[targetPixelOffset + 1] = targetRgba[sourcePixelOffset + 1];
argb[targetPixelOffset + 2] = targetRgba[sourcePixelOffset + 0];
argb[targetPixelOffset + 3] = targetRgba[sourcePixelOffset + 3];
}
sourcePixelOffset += 4;
}
}
// advance
blockOffset += bytesPerBlock;
}
}
return argb;
}
public ColourSet(byte[] rgba, int mask, SquishOptions flags)
{
// Check the compression mode.
var isDxt1 = flags.HasFlag(SquishOptions.DXT1);
var weightByAlpha = flags.HasFlag(SquishOptions.WeightColourByAlpha);
// Create he minimal set.
for (int i = 0; i < 16; ++i)
{
// Check this pixel is enabled.
int bit = 1 << i;
if ((mask & bit) == 0)
{
this._Remap[i] = -1;
continue;
}
// Check for transparent pixels when using DXT1.
if (isDxt1 && rgba[4 * i + 3] < 128)
{
this._Remap[i] = -1;
this._IsTransparent = true;
}
// Loop over previous points for a match.
for (int j = 0;; ++j)
{
// Allocate a new point.
if (j == i)
{
// Normalise coordinates to [0,1].
var x = rgba[4 * i] / 255f;
var y = rgba[4 * i + 1] / 255f;
var z = rgba[4 * i + 2] / 255f;
// Ensure there is always a non-zero weight even for zero alpha.
var w = (rgba[4 * i + 3] + 1) / 256f;
// Add the point.
this._Points[this._Count] = new Vector3(x, y, z);
this._Weights[this._Count] = w;
this._Remap[i] = this._Count;
// Advance.
++this._Count;
break;
}
// Check for a match.
int oldBit = 1 << j;
var match = ((mask & oldBit) != 0) &&
(rgba[4 * i] == rgba[4 * j]) &&
(rgba[4 * i + 1] == rgba[4 * j + 1]) &&
(rgba[4 * i + 3] == rgba[4 * j + 2]) &&
(rgba[4 * j + 3] >= 128 || !isDxt1);
if (match)
{
// Get index of the match.
var index = this._Remap[j];
// Ensure there is always a non-zero weight even for zero alpha.
var w = (rgba[4 * i + 3] + 1) / 256f;
// Map this point and increase the weight.
this._Weights[index] += (weightByAlpha ? w : 1f);
this._Remap[i] = index;
break;
}
}
}
// Square root the weights.
for (int i = 0; i < this._Count; ++i)
{
this._Weights[i] = (float)Math.Sqrt(this._Weights[i]);
}
}
public ColourSet(byte[] rgba, int mask, SquishOptions flags)
{
// Check the compression mode.
var isDxt1 = flags.HasFlag(SquishOptions.DXT1);
var weightByAlpha = flags.HasFlag(SquishOptions.WeightColourByAlpha);
// Create he minimal set.
for (int i = 0; i < 16; ++i)
{
// Check this pixel is enabled.
int bit = 1 << i;
if ((mask & bit) == 0)
{
this._Remap[i] = -1;
continue;
}
// Check for transparent pixels when using DXT1.
if (isDxt1 && rgba[4 * i + 3] < 128)
{
this._Remap[i] = -1;
this._IsTransparent = true;
}
// Loop over previous points for a match.
for (int j = 0;; ++j)
{
// Allocate a new point.
if (j == i)
{
// Normalise coordinates to [0,1].
var x = rgba[4 * i] / 255f;
var y = rgba[4 * i + 1] / 255f;
var z = rgba[4 * i + 2] / 255f;
// Ensure there is always a non-zero weight even for zero alpha.
var w = (rgba[4 * i + 3] + 1) / 256f;
// Add the point.
this._Points[this._Count] = new Vector3(x, y, z);
this._Weights[this._Count] = w;
this._Remap[i] = this._Count;
// Advance.
++this._Count;
break;
}
// Check for a match.
int oldBit = 1 << j;
var match = ((mask & oldBit) != 0)
&& (rgba[4 * i] == rgba[4 * j])
&& (rgba[4 * i + 1] == rgba[4 * j + 1])
&& (rgba[4 * i + 3] == rgba[4 * j + 2])
&& (rgba[4 * j + 3] >= 128 || !isDxt1);
if (match)
{
// Get index of the match.
var index = this._Remap[j];
// Ensure there is always a non-zero weight even for zero alpha.
var w = (rgba[4 * i + 3] + 1) / 256f;
// Map this point and increase the weight.
this._Weights[index] += (weightByAlpha ? w : 1f);
this._Remap[i] = index;
break;
}
}
}
// Square root the weights.
for (int i = 0; i < this._Count; ++i)
{
this._Weights[i] = (float)Math.Sqrt(this._Weights[i]);
}
}
public static int GetStorageRequirements(int width, int height, SquishOptions flags)
{
var blockCount = ((width + 3) / 4) * ((height + 3) / 4);
var blockSize = flags.HasFlag(SquishOptions.DXT1) ? 8 : 16;
return blockCount * blockSize;
}
public static unsafe Image DecompressToBitmap(byte[] blocks, int offset, int width, int height, SquishOptions flags)
{
var fullBuffer = new byte[4 * width * height];
var bufferOffset = 0;
var bytesPerBlock = flags.HasFlag(SquishOptions.DXT1) ? 8 : 16;
var blockOffset = offset;
// Loop over blocks.
for (int y = 0; y < height; y += 4)
{
for (int x = 0; x < width; x += 4)
{
// Decompress the block.
var targetRgba = DecompressBlock(blocks, blockOffset, flags);
// Write the decompressed pixels to the correct image locations.
var sourcePixelOffset = 0;
for (int py = 0; py < 4; ++py)
{
for (int px = 0; px < 4; ++px)
{
// Get the target location.
var sx = x + px;
var sy = y + py;
if (sx < width && sy < height)
{
var i = 4 * (sx + (sy * width));
fullBuffer[bufferOffset + i + 0] = targetRgba[sourcePixelOffset + 2];
fullBuffer[bufferOffset + i + 1] = targetRgba[sourcePixelOffset + 1];
fullBuffer[bufferOffset + i + 2] = targetRgba[sourcePixelOffset + 0];
fullBuffer[bufferOffset + i + 3] = targetRgba[sourcePixelOffset + 3];
}
sourcePixelOffset += 4; // Skip this pixel as it is outside the image.
}
}
// advance
blockOffset += bytesPerBlock;
}
}
Image ret;
fixed (byte* p = fullBuffer)
{
var ptr = (IntPtr)p;
var tempImage = new Bitmap(width, height, 4 * width, System.Drawing.Imaging.PixelFormat.Format32bppArgb, ptr);
ret = new Bitmap(tempImage);
}
return ret;
}
