bool idZeroRunLengthCompressor::WriteByte( uint8 value )
{
if( value != 0 || zeroCount >= 255 )
{
if( !WriteRun() )
{
maxSize = -1;
return false;
}
}
if( value != 0 )
{
if( compressed + 1 > maxSize )
{
maxSize = -1;
return false;
}
if( comp != NULL )
{
comp->WriteByte( value );
}
else
{
*dest++ = value;
}
compressed++;
}
else
{
zeroCount++;
}
return true;
}
int idZeroRunLengthCompressor::End() {
WriteRun();
if ( maxSize == -1 ) {
return -1;
}
return compressed;
}
// Write a 32-bit TGA file.
void Save32BitTGA(
FileHandle_t fp,
FileImage *pImage)
{
TGAFileHeader hdr;
int y, runStart, x;
unsigned char *pLine;
memset(&hdr, 0, sizeof(hdr));
hdr.m_PixelDepth = 32;
hdr.m_ImageType = 10; // Run-length encoded RGB.
hdr.m_Width = pImage->m_Width;
hdr.m_Height = pImage->m_Height;
g_pFullFileSystem->Write(&hdr, sizeof(hdr), fp );
// Lines are written bottom-up.
for(y=pImage->m_Height-1; y >= 0; y--)
{
pLine = &pImage->m_pData[y*pImage->m_Width*4];
runStart = 0;
for(x=0; x < pImage->m_Width; x++)
{
if((x - runStart) >= 128 ||
*((long*)&pLine[runStart*4]) != *((long*)&pLine[x*4]))
{
// Encode this Run.
WriteRun(&pLine[runStart*4], fp, x - runStart);
runStart = x;
}
}
// Encode the last Run.
if(x - runStart > 0)
{
WriteRun(&pLine[runStart*4], fp, x - runStart);
}
}
}
