//------------------------------------------------------------------------------
public bool DecodeImage()
{
// Initialization.
if (state_ != VP8DecodeState.ReadData)
{
AllocateInternalBuffers32b (io_.width);
if (incremental_)
{
if (hdr_.color_cache_size_ > 0
&& hdr_.saved_color_cache_.colors_ == null)
{
hdr_.saved_color_cache_.Init (hdr_.color_cache_.hash_bits_);
}
}
state_ = VP8DecodeState.ReadData;
}
// Decode.
return DecodeImageData (pixels32_, width_, height_, height_, ProcessRows);
}
public bool DecodeImageStream(int xsize, int ysize, bool is_level0, ref uint[] decoded_data, bool set_data)
{
bool ok = true;
int transform_xsize = xsize;
int transform_ysize = ysize;
int color_cache_bits = 0;
uint[] data = null;
// Read the transforms (may recurse).
if (is_level0)
{
while (ok && 0 != br_.ReadBits (1))
ok = ReadTransform (ref transform_xsize, ref transform_ysize);
}
// Color cache
if (ok && 0 != br_.ReadBits (1))
{
color_cache_bits = (int)br_.ReadBits (4);
ok = (color_cache_bits >= 1 && color_cache_bits <= MaxCacheBits);
if (!ok)
{
status_ = VP8StatusCode.BitstreamError;
return false;
}
}
// Read the Huffman codes (may recurse).
ok = ok && ReadHuffmanCodes (transform_xsize, transform_ysize, color_cache_bits, is_level0);
if (!ok)
{
status_ = VP8StatusCode.BitstreamError;
return false;
}
// Finish setting up the color-cache
if (color_cache_bits > 0)
{
hdr_.color_cache_size_ = 1 << color_cache_bits;
hdr_.color_cache_.Init (color_cache_bits);
}
else
{
hdr_.color_cache_size_ = 0;
}
UpdateDecoder (transform_xsize, transform_ysize);
if (is_level0) // level 0 complete
{
state_ = VP8DecodeState.ReadHdr;
}
else
{
var total_size = transform_xsize * transform_ysize;
data = new uint[total_size];
// Use the Huffman trees to decode the LZ77 encoded data.
ok = DecodeImageData (data, transform_xsize, transform_ysize, transform_ysize, null);
ok = ok && !br_.EoS;
}
if (ok)
{
if (set_data)
{
decoded_data = data;
}
last_pixel_ = 0; // Reset for future DECODE_DATA_FUNC() calls.
if (!is_level0)
hdr_.ClearMetadata();
}
return ok;
}
public LosslessDecoder()
{
status_ = VP8StatusCode.Ok;
state_ = VP8DecodeState.ReadDim;
for (int i = 0; i < transforms_.Length; ++i)
transforms_[i] = new VP8LTransform();
}
