Method GetThumbnail

trinity/Resources/Tr2LightProfileRes.cpp:249–354

}

BlueStdResult Tr2LightProfileRes::GetThumbnail( uint32_t width, uint32_t height, Tr2HostBitmapPtr& bitmap ) const
{
	bitmap = nullptr;

	IBlueStreamPtr stream;
	auto success = BePaths->GetFileContentsWithYield( m_path.c_str(), &stream );
	if( !BeIsSuccess( success ) )
	{
		return BlueStdResult( BLUE_STD_RESULT_IO_ERROR, success.value.c_str() );
	}

	ImageIO::HostBitmap lightmap;

	if( IsIesExtension( m_path.c_str() ) )
	{
		std::string contents;
		contents.resize( stream->GetSize() );
		stream->Read( contents.data(), contents.size() );

		if( !ParseIes( contents, lightmap ) )
		{
			return BlueStdResult( BLUE_STD_RESULT_RUNTIME_ERROR, "Failed to parse IES file" );
		}
	}
	else
	{
		auto result = ImageIO::ReadImage( *stream, ImageIO::LoadParameters( m_path.c_str() ), lightmap );
		if( !result )
		{
			return BlueStdResult( BLUE_STD_RESULT_IO_ERROR, result.GetErrorMessage().c_str() );
		}
		if( !IsCompatibleBitmap( lightmap ) )
		{
			return BlueStdResult( BLUE_STD_RESULT_VALUE_ERROR, "The input texture has incompatible dimensions/format" );
		}
	}

	bitmap.CreateInstance();
	bitmap->Create( width, height, 1, Tr2RenderContextEnum::PIXEL_FORMAT_B8G8R8X8_UNORM );
	if( !bitmap )
	{
		bitmap = nullptr;
		return BlueStdResult( BLUE_STD_RESULT_MEMORY_ERROR, "Ran out of memory when creating the thumbnail bitmap" );
	}

	auto PlaneRay = []( const Plane& plane, const Vector3& origin, const Vector3& direction ) {
		float t = -( plane.d + origin.x * plane.a + origin.y * plane.b + origin.z * plane.c ) / ( direction.x * plane.a + direction.y * plane.b + direction.z * plane.c );
		return std::make_pair( t, origin + direction * t );
	};


	float aspectRatio = float( width ) / float( height );

	Matrix rotation = RotationMatrix( Vector3( 1, 0, 0 ), 0.3f );

	Vector3 light = Vector3( 0, 0.7f, 0.98f );

	for( uint32_t j = 0; j < height; ++j )