Orange branch: OpenEXR finally in Blender!

Credits go to Gernot Ziegler, who originally coded EXR support, and to
Austin  Benesh for bringing it further. Kent Mein provided a lot of code
for integrating float buffers in Blender imbuf and ImBuf API cleanup,
and provided Make and Scons and static linking.

At this moment; the EXR libraries are a *dependency*, so you cannot get
the Orange branch compiled without having OpenEXR installed. Get the
(precompiled or sources) stuff from www.openexr.com. Current default is
that the headers and lib resides in /user/local/

Several changes/additions/fixes were added:

- EXR code only supported 'half' format (16 bits per channel). I've added
  float writing, but for reading it I need tomorrow. :)
- Quite some clumsy copying of data happened in EXR code.
- cleaned up the api calls already a bit, preparing for more advanced
  support
- Zbuffers were saved 16 bits, now 32 bits
- automatic adding of .exr extensions went wrong

Imbuf:

- added proper imbuf->flags and imbuf->mall support for float buffers, it
  was created for *each* imbuf. :)
- found bugs for float buffers in scaling and flipping. Code there will
  need more checks still
- imbuf also needs to be verified to behave properly when no 32 bits
  rect exists (for saving for example)

TODO:

- support internal float images for textures, backbuf, AO probes, and
  display in Image window

Hope this commit won't screwup syncing with bf-blender... :/

1 files changed, 31 insertions, 11 deletions

diff --git a/source/blender/imbuf/intern/rotate.c b/source/blender/imbuf/intern/rotate.c
index f8d01789cdc..13edfbf0a33 100644
--- a/source/blender/imbuf/intern/rotate.c
+++ b/source/blender/imbuf/intern/rotate.c
@@ -43,26 +43,46 @@
 
 void IMB_flipy(struct ImBuf * ibuf)
 {
-	short x,y,backx;
-	unsigned int *top,*bottom,temp;
+	short x, y;
+	unsigned int *top, *bottom, do_float=0, *line;
+	float *topf=NULL, *bottomf=NULL, *linef=NULL;
 
-	if (ibuf == 0) return;
-	if (ibuf->rect == 0) return;
+	if (ibuf == NULL) return;
+	if (ibuf->rect == NULL) return;
+	
+	if (ibuf->rect_float) do_float =1;
 
 	x = ibuf->x;
 	y = ibuf->y;
-	backx = x<<1;
 
 	top = ibuf->rect;
 	bottom = top + ((y-1) * x);
+	line= MEM_mallocN(x*sizeof(int), "linebuf");
+	
+	if (do_float) {
+		topf= ibuf->rect_float;
+		bottomf = topf + 4*((y-1) * x);
+		linef= MEM_mallocN(4*x*sizeof(float), "linebuff");
+	}
 	y >>= 1;
 
-	for(;y>0;y--){
-		for(x = ibuf->x; x > 0; x--){
-			temp = *top;
-			*(top++) = *bottom;
-			*(bottom++) = temp;
+	for(;y>0;y--) {
+		
+		memcpy(line, top, x*sizeof(int));
+		memcpy(top, bottom, x*sizeof(int));
+		memcpy(bottom, line, x*sizeof(int));
+		bottom -= x;
+		top+= x;
+		
+		if(do_float) {
+			memcpy(linef, topf, 4*x*sizeof(float));
+			memcpy(topf, bottomf, 4*x*sizeof(float));
+			memcpy(bottomf, linef, 4*x*sizeof(float));
+			bottomf -= 4*x;
+			topf+= 4*x;
 		}
-		bottom -= backx;
 	}
+	
+	MEM_freeN(line);
+	if(linef) MEM_freeN(linef);
 }