Method CopyFromRenderTargetRegion

trinity/Tr2StreamingBitmapSaver.cpp:157–234

-------------------------------------------------------------------------------------- Description: Copies region of a readable render target into current window of the image. Arguments: rt - A render target left, top, right, bottom - Rectangle inside render target to be copied offsetX, offsetY - offset in the image to copy render target to Return Value: AL result of operation --------------------

//   AL result of operation
// --------------------------------------------------------------------------------------
ALResult Tr2StreamingBitmapSaver::CopyFromRenderTargetRegion(
	Tr2RenderTarget* rt,
	int left,
	int top,
	int right,
	int bottom,
	int offsetX,
	int offsetY )
{
	if( !rt || !rt->IsValid() || !m_output || !m_rowsPerBatch )
	{
		return E_INVALIDARG;
	}
	if( rt->GetRenderTarget().GetFormat() != m_format )
	{
		return E_INVALIDARG;
	}

	left = max( 0, left );
	top = max( 0, top );
	right = min( int( rt->GetRenderTarget().GetWidth() ), right );
	bottom = min( int( rt->GetRenderTarget().GetHeight() ), bottom );

	if( offsetX < 0 )
	{
		left = max( left, -offsetX );
		right = min( right, int( rt->GetRenderTarget().GetWidth() ) + offsetX );
	}
	if( offsetY < int( m_currentOffset ) )
	{
		top = max( top, int( m_currentOffset ) - offsetY );
		bottom = min( bottom, int( rt->GetRenderTarget().GetHeight() ) - ( int( m_currentOffset ) - offsetY ) );
	}
	offsetX += left;
	offsetY += top;
	offsetY -= m_currentOffset;

	if( left >= right ||
		top >= bottom ||
		int( m_width ) < offsetX ||
		int( m_rowsPerBatch ) < offsetY )
	{
		// source rectangle is empty
		return S_OK;
	}

	unsigned width = min( unsigned( right - left ), m_width - offsetX );
	unsigned height = min( unsigned( bottom - top ), m_rowsPerBatch - offsetY );

	USE_MAIN_THREAD_RENDER_CONTEXT();
	const void* data;
	unsigned srcPitch;
	HRESULT hr;

	if( FAILED( hr = rt->GetRenderTarget().MapForReading( Tr2TextureSubresource( 0 ), data, srcPitch, renderContext ) ) )
	{
		CCP_LOGWARN( "Tr2StreamingBitmapSaver::CopyFromRenderTargetRegion: failed to lock renderTarget" );
		return hr;