Couple of features/fixes:

- Compositor now frees memory of buffers internally used in groups
  immediately. This wasn't part of the event-based cache anyway

- New option: "Free Texture Images" (in render Output panel). This
  frees after each render of each scene all images and mipmaps as
  used by textures. As reference it prints total amount of MB freed.

- Render stage 'creating speed vectors' had no ESC checking yet

- Made drawing scanline updates during render draw 1 scanline less...
  dunno, still hunting for weird opengl crashes.

- 3D preview render didn't properly skip sequence or composit render.

1 files changed, 3 insertions, 2 deletions

diff --git a/source/blender/src/previewrender.c b/source/blender/src/previewrender.c
index bbe8cb94b20..1ef1f5804fa 100644
--- a/source/blender/src/previewrender.c
+++ b/source/blender/src/previewrender.c
@@ -670,9 +670,10 @@ void BIF_view3d_previewrender(ScrArea *sa)
 		RE_stats_draw_cb(re, view3d_previewrender_stats);
 		RE_test_break_cb(re, qtest);
 		
-		/* no osa, blur, seq, for preview render */
+		/* no osa, blur, seq, layers, etc for preview render */
 		rdata= G.scene->r;
-		rdata.mode &= ~(R_OSA|R_MBLUR|R_DOSEQ);
+		rdata.mode &= ~(R_OSA|R_MBLUR);
+		rdata.scemode &= ~(R_DOSEQ|R_DOCOMP|R_FREE_IMAGE);
 		rdata.layers.first= rdata.layers.last= NULL;
 	
 		RE_InitState(re, &rdata, sa->winx, sa->winy, &ri->disprect);