protected override void Setup(DXTBlockWrapper <DXT5Block> pBlock)
{
base.Setup(pBlock);
GetBlockColors(m_pBlock, m_colors, IsDXT1);
var block = m_pBlock.Value.alpha;
m_alphas[0] = block.alpha[0];
m_alphas[1] = block.alpha[1];
if (m_alphas[0] > m_alphas[1])
{
// 8 alpha block
for (var i = 0; i < 6; i++)
{
m_alphas[i + 2] = (uint)((6 - i) * m_alphas[0] + (1 + i) * m_alphas[1] + 3) / 7;
}
}
else
{
// 6 alpha block
for (var i = 0; i < 4; i++)
{
m_alphas[i + 2] = (uint)((4 - i) * m_alphas[0] + (1 + i) * m_alphas[1] + 2) / 5;
}
m_alphas[6] = 0;
m_alphas[7] = 0xFF;
}
}
protected unsafe virtual void DecodeDXTBlock(byte *pbDst, DXTBlockWrapper <TBlock> block, int dstPitch, int bw, int bh)
{
Setup(block);
for (var y = 0; y < bh; y++)
{
var dst = pbDst + y * dstPitch;
SetY(y);
for (var x = 0; x < bw; x++)
{
var color = GetColor(x, y);
* dst = color.r;
dst++;
*dst = color.g;
dst++;
*dst = color.b;
dst++;
*dst = color.a;
dst++;
}
}
}
protected void GetBlockColors(DXTBlockWrapper <TBlock> block, Color8888[] colors, bool isDXT1)
{
int i;
for (i = 0; i < 2; i++)
{
colors[i].a = 0xff;
colors[i].r = (byte)(block.Colors[i].R * 0xff / 0x1f);
colors[i].g = (byte)(block.Colors[i].G * 0xff / 0x3f);
colors[i].b = (byte)(block.Colors[i].B * 0xff / 0x1f);
}
// WORD *wCol = (WORD *)block.colors;
// if (wCol[0] > wCol[1] || !isDXT1) {
if (block.Value.Color.colors[0].clr565 > block.Value.Color.colors[1].clr565 || !isDXT1)
{
// 4 color block
for (i = 0; i < 2; i++)
{
colors[i + 2].a = 0xff;
colors[i + 2].r = (byte)(((ushort)(colors[0].r) * (2 - i) + (ushort)(colors[1].r) * (1 + i)) / 3);
colors[i + 2].g = (byte)(((ushort)(colors[0].g) * (2 - i) + (ushort)(colors[1].g) * (1 + i)) / 3);
colors[i + 2].b = (byte)(((ushort)(colors[0].b) * (2 - i) + (ushort)(colors[1].b) * (1 + i)) / 3);
}
}
else
{
// 3 color block, number 4 is transparent
colors[2].a = 0xff;
colors[2].r = (byte)(((ushort)(colors[0].r) + (ushort)(colors[1].r)) / 2);
colors[2].g = (byte)(((ushort)(colors[0].g) + (ushort)(colors[1].g)) / 2);
colors[2].b = (byte)(((ushort)(colors[0].b) + (ushort)(colors[1].b)) / 2);
colors[3].a = 0x00;
colors[3].g = 0x00;
colors[3].b = 0x00;
colors[3].r = 0x00;
}
}
public Bitmap Decode(DDSURFACEDESC2 desc, Stream stream)
{
var width = (int)desc.dwWidth & ~3;
var height = (int)desc.dwHeight & ~3;
// allocate a 32-bit dib
var bmp = new Bitmap(width, height, PixelFormat.Format32bppArgb);
var bpp = 4; // bytes per pixel
var line = width * bpp;
var reader = new BinaryReader(stream);
var blocks = new DXTBlockWrapper <TBlock> [(width + 3) / 4];
var widthRest = (int)width & 3;
var heightRest = (int)height & 3;
var inputLine = (width + 3) / 4;
var y = 0;
var bitmapData = bmp.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.WriteOnly, bmp.PixelFormat);
var ptrPixels = bitmapData.Scan0;
unsafe
{
// Get the pointer to the image bits.
var stride = bitmapData.Stride;
byte *pBits;
if (stride > 0)
{
pBits = (byte *)ptrPixels.ToPointer();
}
else
{
pBits = (byte *)ptrPixels.ToPointer() + stride * (height - 1);
}
/* if (false)
* {
* if (stride > 0)
* pBits = (byte*)ptrPixels.ToPointer() + stride * (height - 1);
* else
* pBits = (byte*)ptrPixels.ToPointer();
* stride = -stride;
* }
*/
if (height >= 4)
{
for (; y < height; y += 4)
{
for (var j = 0; j < blocks.Length; j++)
{
var streamPos = stream.Position;
blocks[j] = new DXTBlockWrapper <TBlock>((TBlock)reader.ReadStruct(typeof(TBlock)));
stream.Position = streamPos + BytesPerBlock;
}
var pbDst = pBits + y * stride;
// pbDst = pBits + (height - y - 1) * stride;
var blockPos = 0;
if (width >= 4)
{
for (var x = 0; x < width; x += 4)
{
DecodeDXTBlock(pbDst, blocks[blockPos++], stride, 4, 4);
//pbSrc += INFO::bytesPerBlock;
pbDst += 4 * 4;
}
}
if (widthRest > 0)
{
DecodeDXTBlock(pbDst, blocks[blockPos++], stride, widthRest, 4);
}
}
}
if (heightRest > 0)
{
for (var j = 0; j < blocks.Length; j++)
{
var streamPos = stream.Position;
blocks[j] = new DXTBlockWrapper <TBlock>((TBlock)reader.ReadStruct(typeof(TBlock)));
stream.Position = streamPos + BytesPerBlock;
}
var pbDst = pBits + y * stride;
// pbDst = pBits + (height - y - 1) * stride;
var blockPos = 0;
if (width >= 4)
{
for (var x = 0; x < width; x += 4)
{
DecodeDXTBlock(pbDst, blocks[blockPos++], stride, 4, heightRest);
// pbSrc += INFO::bytesPerBlock;
pbDst += 4 * 4;
}
}
if (widthRest > 0)
{
DecodeDXTBlock(pbDst, blocks[blockPos++], stride, widthRest, heightRest);
}
}
} // unsafe
bmp.UnlockBits(bitmapData);
return(bmp);
}
protected virtual void Setup(DXTBlockWrapper <TBlock> pBlock)
{
m_pBlock = pBlock;
}
protected override void Setup(DXTBlockWrapper <DXT3Block> pBlock)
{
base.Setup(pBlock);
GetBlockColors(m_pBlock, m_colors, IsDXT1);
}
