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, 18 insertions, 2 deletions

diff --git a/source/blender/imbuf/intern/imageprocess.c b/source/blender/imbuf/intern/imageprocess.c
index dcdd0692fc4..f98244c5a0f 100644
--- a/source/blender/imbuf/intern/imageprocess.c
+++ b/source/blender/imbuf/intern/imageprocess.c
@@ -40,13 +40,19 @@
  * $Id$
  */
 
+#include "IMB_imbuf_types.h"
 #include "IMB_imbuf.h"
 
 /* Only this one is used liberally here, and in imbuf */
-void IMB_convert_rgba_to_abgr(int size, unsigned int *rect)
+void IMB_convert_rgba_to_abgr(struct ImBuf *ibuf)
 {
-	char *cp= (char *)rect, rt;
+	int size, do_float=0;
+	unsigned char rt, *cp = (unsigned char *)ibuf->rect;
+	float rtf, *cpf = ibuf->rect_float;
 	
+	if (ibuf->rect_float)  do_float = 1;
+	size = ibuf->x * ibuf->y;
+
 	while(size-- > 0) {
 		rt= cp[0];
 		cp[0]= cp[3];
@@ -55,5 +61,15 @@ void IMB_convert_rgba_to_abgr(int size, unsigned int *rect)
 		cp[1]= cp[2];
 		cp[2]= rt;
 		cp+= 4;
+		if (do_float) {
+			rtf= cpf[0];
+			cpf[0]= cpf[3];
+			cpf[3]= rtf;
+			rtf= cpf[1];
+			cpf[1]= cpf[2];
+			cpf[2]= rtf;
+			cpf+= 4;
+		}
 	}
 }
+