bool LICECaptureDecompressor::NextFrame() // TRUE if out of frames
{
if (++m_frameidx >= m_frame_deltas[m_rd_which].GetSize())
{
m_rd_which=!m_rd_which;
DecompressBlock(m_rd_which,1.0);
if (!ReadHdr(!m_rd_which))
memset(&m_curhdr[!m_rd_which],0,sizeof(m_curhdr[!m_rd_which]));
m_frameidx=0;
if (!m_curhdr[m_rd_which].bpp) return false;
DecodeSlices();
}
else
DecompressBlock(!m_rd_which,m_frameidx/(double)m_frame_deltas[m_rd_which].GetSize());
return false;
}
int LICECaptureDecompressor::Seek(unsigned int offset_ms)
{
memset(m_curhdr,0,sizeof(m_curhdr));
if (!m_file) return -1;
int rval=0;
unsigned int seekpos=0;
m_frameidx=0;
if (offset_ms>0&&m_file_frame_info.GetSize())
{
int x;
for(x=0;x<m_file_frame_info.GetSize()-2;x+=2)
{
if (offset_ms < m_file_frame_info.Get()[x+2+1]) break;
}
seekpos = m_file_frame_info.Get()[x];
offset_ms -= m_file_frame_info.Get()[x+1];
// figure out the best place to seek
}
else
{
if (offset_ms>0) rval=-1;
offset_ms=0;
}
m_rd_which=0;
m_file->SetPosition(seekpos);
if (!ReadHdr(m_rd_which)||!DecompressBlock(m_rd_which,1.0))
{
rval=-1;
memset(&m_curhdr,0,sizeof(m_curhdr));
}
else
{
if (offset_ms>0 && rval==0)
{
int x;
for (x = 1; x < m_frame_deltas[m_rd_which].GetSize(); x++)
{
if (offset_ms < m_frame_deltas[m_rd_which].Get()[x])
{
rval = offset_ms;
break;
}
offset_ms -= m_frame_deltas[m_rd_which].Get()[x];
}
m_frameidx=x-1;
}
if (!ReadHdr(!m_rd_which))
memset(&m_curhdr[!m_rd_which],0,sizeof(m_curhdr[!m_rd_which]));
DecodeSlices();
}
return rval;
}
// Allocates using new[], doesn't free.
uint8_t *ETC1ToRGBA(uint8_t *etc1, int width, int height) {
uint8_t *rgba = new uint8_t[width * height * 4];
memset(rgba, 0xFF, width * height * 4);
for (int y = 0; y < height; y += 4) {
for (int x = 0; x < width; x += 4) {
DecompressBlock(etc1 + ((y / 4) * width/4 + (x / 4)) * 8,
rgba + (y * width + x) * 4, width, 255);
}
}
return rgba;
}
/*
========================
idLZWCompressor::ReadByte
========================
*/
int idLZWCompressor::ReadByte( bool ignoreOverflow ) {
if ( blockIndex == blockSize ) {
DecompressBlock();
}
if ( blockIndex == blockSize ) { //-V581 DecompressBlock() updates these values, the if() isn't redundant
if ( !ignoreOverflow ) {
overflowed = true;
assert( !"idLZWCompressor::ReadByte overflowed!" );
}
return -1;
}
return block[blockIndex++];
}