Function CompressYCoCgDXT5

trinity/Tr2DxtCompressor.cpp:605–642

}

void CompressYCoCgDXT5( const uint8_t* inBuf, uint8_t* outBuf, int width, int height, ptrdiff_t& outputBytes, volatile const bool& cancel )
{
	uint8_t block[64];
	uint8_t minColor[4];
	uint8_t maxColor[4];

	uint8_t** outData = &outBuf;

	for( int j = 0; j < height; j += 4, inBuf += width * 4 * 4 )
	{
		if( cancel )
		{
			return;
		}
		for( int i = 0; i < width; i += 4 )
		{

			ExtractBlock( inBuf + i * 4, width, block );

			GetMinMaxYCoCg( block, minColor, maxColor );
			ScaleYCoCg( block, minColor, maxColor );
			InsetYCoCgBBox( minColor, maxColor );
			SelectYCoCgDiagonal( block, minColor, maxColor );

			EmitByte( maxColor[3], outData );
			EmitByte( minColor[3], outData );

			EmitAlphaIndices( block, minColor[3], maxColor[3], outData );

			EmitWord( ColorTo565( maxColor ), outData );
			EmitWord( ColorTo565( minColor ), outData );

			EmitColorIndices( block, minColor, maxColor, outData );
		}
	}

	outputBytes = *outData - outBuf;
}

void CompressImageSquish( const uint8_t* inBuf,
						  unsigned width,