Function ExtractBlockDXT5N

trinity/Tr2DxtCompressor.cpp:217–232

Extract a block, but blank out blue, and swap red and alpha, on the fly.

// Extract a block, but blank out blue, and swap red and alpha, on the fly.
void ExtractBlockDXT5N( const uint8_t* inPtr, const int width, uint8_t* colorBlock )
{
	for( int j = 0; j != 4; ++j )
	{
		const uint8_t* src = inPtr;
		for( int i = 0; i != 4; ++i, src += 4 )
		{
			*colorBlock++ = 0;
			*colorBlock++ = src[1];
			*colorBlock++ = src[3];
			*colorBlock++ = src[2];
		}

		inPtr += width * 4;
	}
}

void GetMinMaxYCoCg( uint8_t* colorBlock, uint8_t* minColor, uint8_t* maxColor )
{