Function CompressNormalMapDXT5

trinity/Tr2DxtCompressor.cpp:705–730

}

void CompressNormalMapDXT5( 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 )
		{
			ExtractBlockDXT5N( inBuf + i * 4, width, block );
			GetMinMaxColorsWithAlpha( 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 CompressImageDXT1( const uint8_t* inBuf, uint8_t* outBuf, int width, int height, ptrdiff_t& outputBytes, volatile const bool& cancel )
{