From 3b559c8cc86fab02609556d2bbdd92aa3d1c3cba Mon Sep 17 00:00:00 2001
From: Campbell Barton <ideasman42@gmail.com>
Date: Fri, 6 Jul 2012 09:22:59 +0000
Subject: [PATCH] rgb color display options for compo backdrop.

---
 source/blender/editors/space_node/drawnode.c | 20 +++++++++++++++++++-
 source/blender/makesdna/DNA_space_types.h    |  3 +++
 source/blender/makesrna/intern/rna_space.c   |  3 +++
 3 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/source/blender/editors/space_node/drawnode.c b/source/blender/editors/space_node/drawnode.c
index daab0ce0f5f..5596e9151c7 100644
--- a/source/blender/editors/space_node/drawnode.c
+++ b/source/blender/editors/space_node/drawnode.c
@@ -2951,7 +2951,25 @@ void draw_nodespace_back_pix(ARegion *ar, SpaceNode *snode, int color_manage)
 			}
 
 			if (ibuf->rect) {
-				if (snode->flag & SNODE_SHOW_ALPHA) {
+				if (snode->flag & (SNODE_SHOW_R | SNODE_SHOW_G | SNODE_SHOW_B)) {
+					int ofs;
+
+					if      (snode->flag & SNODE_SHOW_R) ofs = 1;
+					else if (snode->flag & SNODE_SHOW_G) ofs = 2;
+					else                                 ofs = 3;
+
+					if (ENDIAN_ORDER == B_ENDIAN) {
+						ofs = 3 - ofs;
+					}
+
+					glPixelZoom(snode->zoom, snode->zoom);
+					/* swap bytes, so alpha is most significant one, then just draw it as luminance int */
+
+					glaDrawPixelsSafe(x, y, ibuf->x, ibuf->y, ibuf->x, GL_LUMINANCE, GL_UNSIGNED_INT, ((unsigned char *)ibuf->rect) + ofs);
+
+					glPixelZoom(1.0f, 1.0f);
+				}
+				else if (snode->flag & SNODE_SHOW_ALPHA) {
 					glPixelZoom(snode->zoom, snode->zoom);
 					/* swap bytes, so alpha is most significant one, then just draw it as luminance int */
 					if (ENDIAN_ORDER == B_ENDIAN)
diff --git a/source/blender/makesdna/DNA_space_types.h b/source/blender/makesdna/DNA_space_types.h
index 28c386241a7..b3f0950fa75 100644
--- a/source/blender/makesdna/DNA_space_types.h
+++ b/source/blender/makesdna/DNA_space_types.h
@@ -879,6 +879,9 @@ typedef enum eSpaceNode_Flag {
 /*  SNODE_DISPGP         = (1 << 2), */ /* XXX: Grease Pencil - deprecated? */
 	SNODE_USE_ALPHA      = (1 << 3),
 	SNODE_SHOW_ALPHA     = (1 << 4),
+	SNODE_SHOW_R         = (1 << 7),
+	SNODE_SHOW_G         = (1 << 8),
+	SNODE_SHOW_B         = (1 << 9),
 	SNODE_AUTO_RENDER    = (1 << 5),
 	SNODE_SHOW_HIGHLIGHT = (1 << 6),
 } eSpaceNode_Flag;
diff --git a/source/blender/makesrna/intern/rna_space.c b/source/blender/makesrna/intern/rna_space.c
index f6286333111..48ae6522da9 100644
--- a/source/blender/makesrna/intern/rna_space.c
+++ b/source/blender/makesrna/intern/rna_space.c
@@ -2852,6 +2852,9 @@ static void rna_def_space_node(BlenderRNA *brna)
 		{SNODE_USE_ALPHA, "COLOR_ALPHA", ICON_IMAGE_RGB_ALPHA, "Color and Alpha",
 		                  "Draw image with RGB colors and alpha transparency"},
 		{SNODE_SHOW_ALPHA, "ALPHA", ICON_IMAGE_ALPHA, "Alpha", "Draw alpha transparency channel"},
+		{SNODE_SHOW_R, "RED", 0, "Red", ""},
+		{SNODE_SHOW_G, "GREEN", 0, "Green", ""},
+		{SNODE_SHOW_B, "BLUE", 0, "Blue", ""},
 		{0, NULL, 0, NULL, NULL}
 	};