Orange: fixes in Compositor:

- Curves in Image window didn't copy alpha (when no 32 bits rect for
  display was made already).
- Code was missing to validate grouped nodes in Compositor, didnt work
  at all yet
- Loading new Images in a Node (using filewindow) didn't assign the image

Image window now displays Alpha for float images too

source/blender/blenkernel/intern/colortools.c

@@ -584,7 +584,7 @@ void curvemapping_do_image(CurveMapping *cumap, Image *ima)
 			pixc[0]= FTOCHAR(col[0]);
 			pixc[1]= FTOCHAR(col[1]);
 			pixc[2]= FTOCHAR(col[2]);
-			/* assume alpha was set */
+			pixc[3]= FTOCHAR(pixf[3]);
 		}
 	}
 	

source/blender/blenkernel/intern/node.c

@@ -33,6 +33,7 @@
 #include "DNA_ID.h"
 #include "DNA_node_types.h"
 #include "DNA_material_types.h"
+#include "DNA_scene_types.h"
 
 #include "BKE_blender.h"
 #include "BKE_colortools.h"
@@ -498,12 +499,12 @@ bNode *nodeMakeGroupFromSelected(bNodeTree *ntree)
 /* should become callbackable... */
 void nodeVerifyGroup(bNodeTree *ngroup)
 {
-	Material *ma;
 	
 	/* group changed, so we rebuild the type definition */
 	ntreeMakeOwnType(ngroup);
 	
 	if(ngroup->type==NTREE_SHADER) {
+		Material *ma;
 		for(ma= G.main->mat.first; ma; ma= ma->id.next) {
 			if(ma->nodetree) {
 				bNode *node;
@@ -524,6 +525,28 @@ void nodeVerifyGroup(bNodeTree *ngroup)
 			}
 		}
 	}
+	else if(ngroup->type==NTREE_COMPOSIT) {
+		Scene *sce;
+		for(sce= G.main->scene.first; sce; sce= sce->id.next) {
+			if(sce->nodetree) {
+				bNode *node;
+				
+				/* find if group is in tree */
+				for(node= sce->nodetree->nodes.first; node; node= node->next)
+					if(node->id == (ID *)ngroup)
+						break;
+				
+				if(node) {
+					/* set all type pointers OK */
+					ntreeInitTypes(sce->nodetree);
+					
+					for(node= sce->nodetree->nodes.first; node; node= node->next)
+						if(node->id == (ID *)ngroup)
+							nodeVerifyType(sce->nodetree, node);
+				}
+			}
+		}
+	}
 }
 
 /* also to check all users of groups. Now only used in editor for hide/unhide */
@@ -532,7 +555,6 @@ void nodeGroupSocketUseFlags(bNodeTree *ngroup)
 {
 	bNode *node;
 	bNodeSocket *sock;
-	Material *ma;
 
 	/* clear flags */
 	for(node= ngroup->nodes.first; node; node= node->next) {
@@ -544,6 +566,7 @@ void nodeGroupSocketUseFlags(bNodeTree *ngroup)
 	
 	/* tag all thats in use */
 	if(ngroup->type==NTREE_SHADER) {
+		Material *ma;
 		for(ma= G.main->mat.first; ma; ma= ma->id.next) {
 			if(ma->nodetree) {
 				for(node= ma->nodetree->nodes.first; node; node= node->next) {
@@ -561,6 +584,25 @@ void nodeGroupSocketUseFlags(bNodeTree *ngroup)
 			}
 		}
 	}
+	else if(ngroup->type==NTREE_COMPOSIT) {
+		Scene *sce;
+		for(sce= G.main->scene.first; sce; sce= sce->id.next) {
+			if(sce->nodetree) {
+				for(node= sce->nodetree->nodes.first; node; node= node->next) {
+					if(node->id==(ID *)ngroup) {
+						for(sock= node->inputs.first; sock; sock= sock->next)
+							if(sock->link)
+								if(sock->tosock) 
+									sock->tosock->flag |= SOCK_IN_USE;
+						for(sock= node->outputs.first; sock; sock= sock->next)
+							if(nodeCountSocketLinks(sce->nodetree, sock))
+								if(sock->tosock) 
+									sock->tosock->flag |= SOCK_IN_USE;
+					}
+				}
+			}
+		}
+	}
 }
 
 static void find_node_with_socket(bNodeTree *ntree, bNodeSocket *sock, bNode **nodep, int *sockindex)

source/blender/src/drawimage.c

@@ -47,6 +47,7 @@
 #include "BLI_arithb.h"
 #include "BLI_blenlib.h"
 
+#include "IMB_imbuf.h"
 #include "IMB_imbuf_types.h"
 
 #include "DNA_camera_types.h"
@@ -1125,6 +1126,26 @@ static void sima_draw_alpha_pixels(float x1, float y1, int rectx, int recty, uns
 	glPixelStorei(GL_UNPACK_SWAP_BYTES, 0);
 }
 
+static void sima_draw_alpha_pixelsf(float x1, float y1, int rectx, int recty, float *rectf)
+{
+	float *trectf= MEM_mallocN(rectx*recty*4, "temp");
+	int a, b;
+	
+	for(a= rectx*recty -1, b= 4*a+3; a>=0; a--, b-=4)
+		trectf[a]= rectf[b];
+	
+	glaDrawPixelsSafe(x1, y1, rectx, recty, rectx, GL_LUMINANCE, GL_FLOAT, trectf);
+	MEM_freeN(trectf);
+	/* ogl trick below is slower... (on ATI 9600) */
+//	glColorMask(1, 0, 0, 0);
+//	glaDrawPixelsSafe(x1, y1, rectx, recty, rectx, GL_RGBA, GL_FLOAT, rectf+3);
+//	glColorMask(0, 1, 0, 0);
+//	glaDrawPixelsSafe(x1, y1, rectx, recty, rectx, GL_RGBA, GL_FLOAT, rectf+2);
+//	glColorMask(0, 0, 1, 0);
+//	glaDrawPixelsSafe(x1, y1, rectx, recty, rectx, GL_RGBA, GL_FLOAT, rectf+1);
+//	glColorMask(1, 1, 1, 1);
+}
+
 static void sima_draw_zbuf_pixels(float x1, float y1, int rectx, int recty, int *recti)
 {
 	if(recti==NULL)
@@ -1288,6 +1309,8 @@ void drawimagespace(ScrArea *sa, void *spacedata)
 				if(sima->flag & SI_SHOW_ALPHA) {
 					if(ibuf->rect)
 						sima_draw_alpha_pixels(x1, y1, ibuf->x, ibuf->y, ibuf->rect);
+					else if(ibuf->rect_float)
+						sima_draw_alpha_pixelsf(x1, y1, ibuf->x, ibuf->y, ibuf->rect_float);
 				}
 				else if(sima->flag & SI_SHOW_ZBUF) {
 					if(ibuf->zbuf)

source/blender/src/editnode.c

@@ -167,10 +167,10 @@ static void load_node_image(char *str)	/* called from fileselect */
 	if(ima) {
 		if(node->id)
 			node->id->us--;
-		else {
+		
 		node->id= &ima->id;
 		ima->id.us++;
-		}
+
 		free_image_buffers(ima);	/* force read again */
 		ima->ok= 1;
 		
@@ -198,7 +198,7 @@ static void composit_node_event(SpaceNode *snode, short event)
 				strcpy(name, ((Image *)node->id)->name);
 			else strcpy(name, U.textudir);
 			
-			/* we make store node->block pointers, and filesel frees it, so we need to clear them */
+			/* node->block pointers are stored, but filesel frees it, so we need to clear them */
 			for(node= snode->edittree->nodes.first; node; node= node->next)
 				node->block= NULL;