public static int GetStorageRequirements(int width, int height, SquishMethod method)
{
int blockcount = ((width + 3) / 4) * ((height + 3) / 4);
int blocksize = (method == SquishMethod.Dxt1) ? 8 : 16;
return(blockcount * blocksize);
}
public static byte[] DecompressImage(int width, int height, byte[] blocks, SquishMethod method)
{
byte[] rgba = new byte[4 * width * height];
unsafe
{
fixed(byte *pSourceBlockBase = blocks, pRgba = rgba)
{
byte *pSourceBlock = pSourceBlockBase;
int bytesPerBlock = method == SquishMethod.Dxt1 ? 8 : 16;
// loop over blocks
for (int y = 0; y < height; y += 4)
{
for (int x = 0; x < width; x += 4)
{
// decompress the block
byte *pTargetRgba = stackalloc byte[4 * 16];
Native.SquishDecompress((IntPtr)pTargetRgba, (IntPtr)pSourceBlock, (int)method);
// write the decompressed pixels to the correct image locations
byte *pSourcePixel = pTargetRgba;
for (int py = 0; py < 4; ++py)
{
for (int px = 0; px < 4; ++px)
{
// get the target location
int sx = x + px;
int sy = y + py;
if (sx < width && sy < height)
{
byte *pTargetPixel = pRgba + 4 * (width * sy + sx);
// copy the rgba value
for (int i = 0; i < 4; ++i)
{
*pTargetPixel++ = *pSourcePixel++;
}
}
else
{
// skip this pixel as its outside the image
pSourcePixel += 4;
}
}
}
// advance
pSourceBlock += bytesPerBlock;
}
}
}
}
return(rgba);
}
public static byte[] CompressImage(byte[] rgba, int width, int height, SquishMethod method, SquishFit fit, SquishMetric metric, SquishExtra extra)
{
byte[] blocks = new byte[GetStorageRequirements(width, height, method)];
unsafe
{
// initialise the block output
fixed(byte *pTargetBlockBase = blocks, pRgba = rgba)
{
byte *pTargetBlock = pTargetBlockBase;
int bytesPerBlock = method == SquishMethod.Dxt1 ? 8 : 16;
// loop over blocks
for (int y = 0; y < height; y += 4)
{
for (int x = 0; x < width; x += 4)
{
byte *pSourceRgba = stackalloc byte[16 * 4];
byte *pTargetPixel = pSourceRgba;
int mask = 0;
for (int py = 0; py < 4; ++py)
{
for (int px = 0; px < 4; ++px)
{
// get the source pixel in the image
int sx = x + px;
int sy = y + py;
// enable if we're in the image
if (sx < width && sy < height)
{
// copy the rgba value
byte *pSourcePixel = pRgba + 4 * (width * sy + sx);
for (int i = 0; i < 4; ++i)
{
*pTargetPixel++ = *pSourcePixel++;
}
// enable this pixel
mask |= (1 << (4 * py + px));
}
else
{
// Skip this pixel as its outside the image
pTargetPixel += 4;
}
}
}
try
{
Native.SquishCompressMasked((IntPtr)pSourceRgba, mask, (IntPtr)pTargetBlock,
(int)method | (int)fit | (int)metric | (int)extra);
}
catch (DllNotFoundException)
{
throw new DllNotFoundException("Shared library Squish2 not found");
}
// advance
pTargetBlock += bytesPerBlock;
}
}
}
}
return(blocks);
}
public static byte[] CompressImage(byte[] rgba, int width, int height, SquishMethod method, SquishFit fit, SquishMetric metric, SquishExtra extra)
{
byte[] blocks = new byte[GetStorageRequirements(width, height, method)];
unsafe
{
// initialise the block output
fixed (byte* pTargetBlockBase = blocks, pRgba = rgba)
{
byte* pTargetBlock = pTargetBlockBase;
int bytesPerBlock = method == SquishMethod.Dxt1 ? 8 : 16;
// loop over blocks
for( int y = 0; y < height; y += 4 )
{
for( int x = 0; x < width; x += 4 )
{
byte* pSourceRgba = stackalloc byte[16 * 4];
byte* pTargetPixel = pSourceRgba;
int mask = 0;
for( int py = 0; py < 4; ++py )
{
for( int px = 0; px < 4; ++px )
{
// get the source pixel in the image
int sx = x + px;
int sy = y + py;
// enable if we're in the image
if( sx < width && sy < height )
{
// copy the rgba value
byte* pSourcePixel = pRgba + 4 * (width * sy + sx);
for (int i = 0; i < 4; ++i)
*pTargetPixel++ = *pSourcePixel++;
// enable this pixel
mask |= (1 << (4 * py + px));
}
else
{
// Skip this pixel as its outside the image
pTargetPixel += 4;
}
}
}
try
{
Native.SquishCompressMasked((IntPtr)pSourceRgba, mask, (IntPtr)pTargetBlock,
(int)method | (int)fit | (int)metric | (int)extra);
}
catch (DllNotFoundException)
{
throw new DllNotFoundException("Shared library Squish2 not found");
}
// advance
pTargetBlock += bytesPerBlock;
}
}
}
}
return blocks;
}
public static int GetStorageRequirements(int width, int height, SquishMethod method)
{
int blockcount = ((width + 3) / 4 ) * ((height + 3) / 4);
int blocksize = (method == SquishMethod.Dxt1) ? 8 : 16;
return blockcount * blocksize;
}
public static byte[] DecompressImage(int width, int height, byte[] blocks, SquishMethod method)
{
byte[] rgba = new byte[4 * width * height];
unsafe
{
fixed (byte* pSourceBlockBase = blocks, pRgba = rgba)
{
byte* pSourceBlock = pSourceBlockBase;
int bytesPerBlock = method == SquishMethod.Dxt1 ? 8 : 16;
// loop over blocks
for (int y = 0; y < height; y += 4)
{
for (int x = 0; x < width; x += 4 )
{
// decompress the block
byte* pTargetRgba = stackalloc byte[4 * 16];
Native.SquishDecompress((IntPtr)pTargetRgba, (IntPtr)pSourceBlock, (int)method);
// write the decompressed pixels to the correct image locations
byte* pSourcePixel = pTargetRgba;
for( int py = 0; py < 4; ++py )
{
for( int px = 0; px < 4; ++px )
{
// get the target location
int sx = x + px;
int sy = y + py;
if( sx < width && sy < height )
{
byte* pTargetPixel = pRgba + 4*(width * sy + sx);
// copy the rgba value
for (int i = 0; i < 4; ++i)
*pTargetPixel++ = *pSourcePixel++;
}
else
{
// skip this pixel as its outside the image
pSourcePixel += 4;
}
}
}
// advance
pSourceBlock += bytesPerBlock;
}
}
}
}
return rgba;
}
