Commit: 976f59ab8cb4ee8822a06ed8c75350460afa2220
Author: Brecht Van Lommel
Date:   Tue Apr 15 15:19:05 2014 +0200
https://developer.blender.org/rB976f59ab8cb4ee8822a06ed8c75350460afa2220

Fix cycles standalone not writing images in background mode properly.

===================================================================

M       intern/cycles/render/session.cpp

===================================================================

diff --git a/intern/cycles/render/session.cpp b/intern/cycles/render/session.cpp
index 23acc96..fec4939 100644
--- a/intern/cycles/render/session.cpp
+++ b/intern/cycles/render/session.cpp
@@ -81,6 +81,7 @@ Session::Session(const SessionParams& params_)
 Session::~Session()
 {
        if(session_thread) {
+               /* wait for session thread to end */
                progress.set_cancel("Exiting");
 
                gpu_need_tonemap = false;
@@ -95,13 +96,19 @@ Session::~Session()
                wait();
        }
 
-       if(display && !params.output_path.empty()) {
+       if(!params.output_path.empty()) {
+               /* tonemap and write out image if requested */
+               delete display;
+
+               display = new DisplayBuffer(device, false);
+               display->reset(device, buffers->params);
                tonemap();
 
                progress.set_status("Writing Image", params.output_path);
                display->write(device, params.output_path);
        }
 
+       /* clean up */
        foreach(RenderBuffers *buffers, tile_buffers)
                delete buffers;
 
@@ -367,7 +374,7 @@ bool Session::acquire_tile(Device *tile_device, RenderTile& 
rtile)
 
        /* in case of a permanent buffer, return it, otherwise we will allocate
         * a new temporary buffer */
-       if(!params.background) {
+       if(!(params.background && params.output_path.empty())) {
                tile_manager.state.buffer.get_offset_stride(rtile.offset, 
rtile.stride);
 
                rtile.buffer = buffers->buffer.device_pointer;

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