private void DecodeStrips()
{
int pStrip = 0;
int size = 0;
tex = new Texture2D(ImageWidth, ImageLength, TextureFormat.RGBA32, false);
Color[] colors = new Color[ImageWidth * ImageLength];
if (Compression == 5)
{
int stripLength = ImageWidth * RowsPerStrip * BitsPerSample.Count * BitsPerSample[1] / 8;
CompressionLZW.CreateBuffer(stripLength);
if (Predictor == 1)
{
int index = 0;
for (int y = 0; y < StripOffsets.Count; y++)
{
//Debug.Log("strip : "+i);
pStrip = StripOffsets[y]; //起始位置
size = StripByteCounts[y]; //读取长度
byte[] Dval = CompressionLZW.Decode(data, pStrip, size);
//Debug.Log(Dval.Length);
for (int x = 0; x < ImageWidth; x++)
{
float R = GetFloat(Dval, x * PixelBytes);
float G = GetFloat(Dval, x * PixelBytes + 4);
float B = GetFloat(Dval, x * PixelBytes + 8);
float A = GetFloat(Dval, x * PixelBytes + 12);
//tex.SetPixel(x,y,new Color(R,G,B,A));//可以一个像素一个像素的设置颜色，也可以先读出来再一起设置颜色
colors[index++] = new Color(R, G, B, A);
}
}
}
else
{
// for(int p = 0; p<Dval.Length-16; p++)
// {
// Dval[p+16] += Dval[p];
// }
}
}
tex.SetPixels(colors);
tex.Apply();
}
private void DecodeStrips()
{
if (BitsPerSample.Count != 0)
{
int k = 0;
int count = -1;
for (int i = 0; i < BitsPerSample.Count; i++)
{
if (BitsPerSample[i] != k)
{
count++;
}
k = BitsPerSample[i];
}
if (count > 0) //三个通道大小不一致
{
return; //暂不支持
}
}
else
{
return;
}
int pStrip = 0;
int size = 0;
//int f = 1;
TextureFormat f = TextureFormat.RGBA32;
if (SampleFormat.Count != 0) //默认为unsigned整型
{
if (SampleFormat[0] == 2) //有符号整型
{
return; //暂不支持
}
if (SampleFormat[0] == 3) //float
{
f = TextureFormat.RGBAFloat;
}
}
tex = new Texture2D(ImageWidth, ImageLength, f, false);
int PixelCount = ImageWidth * ImageLength;
Color[] colors = new Color[PixelCount];
int index = PixelCount;
if (Compression == 5)
{
int stripLength = ImageWidth * RowsPerStrip * BitsPerSample.Count * BitsPerSample[0] / 8;
CompressionLZW.CreateBuffer(stripLength);
//Debug.Log("PlannarConfiguration : " + PlannarConfiguration);//2基本不用，等于2就不解了
if (Predictor == 1)//没有差值处理
{
for (int y = 0; y < StripOffsets.Count; y++)
{
pStrip = StripOffsets[y]; //起始位置
size = StripByteCounts[y]; //读取长度
byte[] Dval = CompressionLZW.Decode(data, pStrip, size);
if (f == TextureFormat.RGBA32 && BitsPerSample[0] == 1)
{
for (int x = 0; x < ImageWidth * RowsPerStrip; x++)
{
float R = Dval[x * PixelBytes] / 255f;
float G = Dval[x * PixelBytes + 1] / 255f;
float B = Dval[x * PixelBytes + 2] / 255f;
float A = PixelBytes > 3 ? Dval[x * PixelBytes + 3] / 255f : 1.0f;
//tex.SetPixel(x,y,new Color(R,G,B,A));//可以一个像素一个像素的设置颜色，也可以先读出来再一起设置颜色
colors[--index] = new Color(R, G, B, A);//解出来的图像是反着的，改Unity.Color的顺序
}
}
else if (f == TextureFormat.RGBAFloat)
{
for (int x = 0; x < ImageWidth * RowsPerStrip; x++)
{
float R = GetFloat(Dval, x * PixelBytes);
float G = GetFloat(Dval, x * PixelBytes + 4);
float B = GetFloat(Dval, x * PixelBytes + 8);
float A = GetFloat(Dval, x * PixelBytes + 12);
colors[--index] = new Color(R, G, B, A);
}
}
}
}
else if (Predictor == 2)//差值处理
{
if (f == TextureFormat.RGBA32 && BitsPerSample[0] == 8)
{
for (int y = 0; y < StripOffsets.Count; y++)
{
pStrip = StripOffsets[y]; //起始位置
size = StripByteCounts[y]; //读取长度
byte[] Dval = CompressionLZW.Decode(data, pStrip, size);
for (int rows = 0; rows < RowsPerStrip; rows++)
{
byte[] last = new byte[4] {
0, 0, 0, 0
};
byte max = 255;
int start = ImageWidth * rows;
int end = ImageWidth * (rows + 1);
for (int x = start; x < end; x++)
{
byte[] rgba = new byte[4] {
255, 255, 255, 255
};
for (int channel = 0; channel < BitsPerSample.Count; channel++)
{
rgba[channel] = Dval[x * PixelBytes + channel];
rgba[channel] += last[channel];
last[channel] = rgba[channel];
}
colors[--index] = new Color(rgba[0] / 255f, rgba[1] / 255f, rgba[2] / 255f, rgba[3] / 255f);
}
}
}
}
}
}
tex.SetPixels(colors);
tex.Apply();
}
