Giant commit!

A full detailed description of this will be done later... is several days
of work. Here's a summary:

Render:
- Full cleanup of render code, removing *all* globals and bad level calls
  all over blender. Render module is now not called abusive anymore
- API-fied calls to rendering
- Full recode of internal render pipeline. Is now rendering tiles by
  default, prepared for much smarter 'bucket' render later.
- Each thread now can render a full part
- Renders were tested with 4 threads, goes fine, apart from some lookup
  tables in softshadow and AO still
- Rendering is prepared to do multiple layers and passes
- No single 32 bits trick in render code anymore, all 100% floats now.

Writing images/movies
- moved writing images to blender kernel (bye bye 'schrijfplaatje'!)
- made a new Movie handle system, also in kernel. This will enable much
  easier use of movies in Blender

PreviewRender:
- Using new render API, previewrender (in buttons) now uses regular render
  code to generate images.
- new datafile 'preview.blend.c' has the preview scenes in it
- previews get rendered in exact displayed size (1 pixel = 1 pixel)

3D Preview render
- new; press Pkey in 3d window, for a panel that continuously renders
  (pkey is for games, i know... but we dont do that in orange now!)
- this render works nearly identical to buttons-preview render, so it stops
  rendering on any event (mouse, keyboard, etc)
- on moving/scaling the panel, the render code doesn't recreate all geometry
- same for shifting/panning view
- all other operations (now) regenerate the full render database still.
- this is WIP... but big fun, especially for simple scenes!

Compositor
- Using same node system as now in use for shaders, you can composit images
- works pretty straightforward... needs much more options/tools and integration
  with rendering still
- is not threaded yet, nor is so smart to only recalculate changes... will be
  done soon!
- the "Render Result" node will get all layers/passes as output sockets
- The "Output" node renders to a builtin image, which you can view in the Image
  window. (yes, output nodes to render-result, and to files, is on the list!)

The Bad News
- "Unified Render" is removed. It might come back in some stage, but this
  system should be built from scratch. I can't really understand this code...
  I expect it is not much needed, especially with advanced layer/passes
  control
- Panorama render, Field render, Motion blur, is not coded yet... (I had to
  recode every single feature in render, so...!)
- Lens Flare is also not back... needs total revision, might become composit
  effect though (using zbuffer for visibility)
- Part render is gone! (well, thats obvious, its default now).
- The render window is only restored with limited functionality... I am going
  to check first the option to render to a Image window, so Blender can become
  a true single-window application. :)
  For example, the 'Spare render buffer' (jkey) doesnt work.
- Render with border, now default creates a smaller image
- No zbuffers are written yet... on the todo!
- Scons files and MSVC will need work to get compiling again

OK... thats what I can quickly recall. Now go compiling!

1 files changed, 28 insertions, 17 deletions

diff --git a/source/blender/imbuf/intern/scaling.c b/source/blender/imbuf/intern/scaling.c
index 539ea0377b3..c962f1fbde5 100644
--- a/source/blender/imbuf/intern/scaling.c
+++ b/source/blender/imbuf/intern/scaling.c
@@ -915,26 +915,33 @@ struct ImBuf *IMB_scaleImBuf(struct ImBuf * ibuf, short newx, short newy)
 	return(ibuf);
 }
 
+struct imbufRGBA {
+	float r, g, b, a;
+};
 
 struct ImBuf *IMB_scalefastImBuf(struct ImBuf *ibuf, short newx, short newy)
 {
 	unsigned int *rect,*_newrect,*newrect;
-	float *rectf,*_newrectf,*newrectf;
-	int x,y, do_float=0;
+	struct imbufRGBA *rectf, *_newrectf, *newrectf;
+	int x,y, do_float=0, do_rect=0;
 	int ofsx,ofsy,stepx,stepy;
 
+	rect = NULL; _newrect = NULL; newrect = NULL;
 	rectf = NULL; _newrectf = NULL; newrectf = NULL;
 
 	if (ibuf==NULL) return(0);
-	if (ibuf->rect==NULL) return(ibuf);
+	if (ibuf->rect) do_rect = 1;
 	if (ibuf->rect_float) do_float = 1;
-
+	if (do_rect==0 && do_float==0) return(ibuf);
+	
 	if (newx == ibuf->x && newy == ibuf->y) return(ibuf);
-
-	_newrect = MEM_mallocN(newx * newy * sizeof(int), "scalefastimbuf");
-	if (_newrect==NULL) return(ibuf);
-	newrect = _newrect;
-
+	
+	if(do_rect) {
+		_newrect = MEM_mallocN(newx * newy * sizeof(int), "scalefastimbuf");
+		if (_newrect==NULL) return(ibuf);
+		newrect = _newrect;
+	}
+	
 	if (do_float) {
 		_newrectf = MEM_mallocN(newx * newy * sizeof(float) * 4, "scalefastimbuf f");
 		if (_newrectf==NULL) return(ibuf);
@@ -946,30 +953,34 @@ struct ImBuf *IMB_scalefastImBuf(struct ImBuf *ibuf, short newx, short newy)
 	ofsy = 32768;
 
 	for (y = newy; y > 0 ; y--){
-		rect = ibuf->rect;
-		rect += (ofsy >> 16) * ibuf->x;
+		if(do_rect) {
+			rect = ibuf->rect;
+			rect += (ofsy >> 16) * ibuf->x;
+		}
 		if (do_float) {
-			rectf = ibuf->rect_float;
+			rectf = (struct imbufRGBA *)ibuf->rect_float;
 			rectf += (ofsy >> 16) * ibuf->x;
 		}
 		ofsy += stepy;
 		ofsx = 32768;
 		
 		for (x = newx ; x>0 ; x--){
-			*newrect++ = rect[ofsx >> 16];
+			if (do_rect)  *newrect++ = rect[ofsx >> 16];
 			if (do_float) *newrectf++ = rectf[ofsx >> 16];
 			ofsx += stepx;
 		}
 	}
 
-	imb_freerectImBuf(ibuf);
-	ibuf->mall |= IB_rect;
-	ibuf->rect = _newrect;
+	if (do_rect) {
+		imb_freerectImBuf(ibuf);
+		ibuf->mall |= IB_rect;
+		ibuf->rect = _newrect;
+	}
 	
 	if (do_float) {
 		imb_freerectfloatImBuf(ibuf);
 		ibuf->mall |= IB_rectfloat;
-		ibuf->rect_float = _newrectf;
+		ibuf->rect_float = (float *)_newrectf;
 	}
 	
 	scalefast_Z_ImBuf(ibuf, newx, newy);