Method PaintEmptyArea

trinity/Tr2TextureAtlas.cpp:867–945

}

void Tr2TextureAtlas::PaintEmptyArea( Tr2TextureAtlasArea* area )
{
	USE_MAIN_THREAD_RENDER_CONTEXT();

	if( !area || !m_paintEmptyAreas || !m_texture.IsValid() )
	{
		return;
	}

	if( m_texture.GetType() != TEX_TYPE_2D ||
		m_format != PIXEL_FORMAT_B8G8R8A8_UNORM )
	{
		return;
	}

	const bool isValidArea =
		area->rect.left >= 0 &&
		area->rect.top >= 0 &&
		area->rect.right >= 0 &&
		area->rect.bottom >= 0 &&
		area->rect.right >= area->rect.left &&
		area->rect.bottom >= area->rect.top &&
		uint32_t( area->rect.right ) <= m_texture.GetWidth() &&
		uint32_t( area->rect.bottom ) <= m_texture.GetHeight();

	CCP_ASSERT( isValidArea );
	if( !isValidArea )
	{
		return;
	}


	void* rgba = nullptr;
	uint32_t pitch = 0;
	CR_RETURN( m_texture.MapForWriting( Tr2TextureSubresource( 0 ), rgba, pitch, renderContext ) );
	ON_BLOCK_EXIT( [&] { m_texture.UnmapForWriting( renderContext ); } );

	uint8_t* dst = (uint8_t*)rgba;

	static unsigned int s_fillValue = 0;
	s_fillValue += 0xabcdef;
	s_fillValue &= 0xffffff;

	const uint32_t width = uint32_t( area->rect.right - area->rect.left );
	const uint32_t height = uint32_t( area->rect.bottom - area->rect.top );

	if( IsCompressedFormat( m_format ) )
	{
		const uint32_t blockSize = GetBlockByteSize( m_format );

		const uint32_t blocksX = width / 4;

		// Have to copy one line at a time since the target area is not linearly laid out.
		for( uint32_t line = 0; line < height; line += 4 )
		{
			uint32_t* p = (uint32_t*)dst;
			for( uint32_t i = 0; i < blocksX * blockSize / 4; ++i )
			{