2.5

Nice goodie: Preview renders!

- Added new preview.blend, allowing super wide cinemascope previews
- Draws nicely blended inside widget type, rounded corners
- Preview now renders using all available cpus/cores.
- Uses - hopefully rock stable - method, which doesn't copy or 
  allocate anything for previews, but just uses render API calls.
- Multiple previews are possible! But, added provision in Jobs
  manager to only render one preview job at a time. If you start
  more preview jobs, they're suspended until it's their turn.

Bugfix: new buttons context code crashed when going full-window.

Tweaks are still needed for notifiers. I have to figure out still
how to retrieve SpaceButs button view types...

1 files changed, 11 insertions, 5 deletions

diff --git a/source/blender/render/intern/source/pipeline.c b/source/blender/render/intern/source/pipeline.c
index 2d6e03f95c2..683bb9eb1a0 100644
--- a/source/blender/render/intern/source/pipeline.c
+++ b/source/blender/render/intern/source/pipeline.c
@@ -1120,11 +1120,17 @@ void RE_InitState(Render *re, Render *source, RenderData *rd, int winx, int winy
 		/* always call, checks for gamma, gamma tables and jitter too */
 		make_sample_tables(re);	
 		
-		/* make empty render result, so display callbacks can initialize */
-		RE_FreeRenderResult(re->result);
-		re->result= MEM_callocN(sizeof(RenderResult), "new render result");
-		re->result->rectx= re->rectx;
-		re->result->recty= re->recty;
+		/* if preview render, we try to keep old result */
+		if(re->result && (re->r.scemode & R_NODE_PREVIEW) && 
+		   re->result->rectx==re->rectx && re->result->recty==re->recty);
+		else {
+			
+			/* make empty render result, so display callbacks can initialize */
+			RE_FreeRenderResult(re->result);
+			re->result= MEM_callocN(sizeof(RenderResult), "new render result");
+			re->result->rectx= re->rectx;
+			re->result->recty= re->recty;
+		}
 		
 		/* we clip faces with a minimum of 2 pixel boundary outside of image border. see zbuf.c */
 		re->clipcrop= 1.0f + 2.0f/(float)(re->winx>re->winy?re->winy:re->winx);