Compositor: Cryptomatte compositing node.

This patch adds a new matte node that implements the Cryptomatte specification.
It also incluces a custom eye dropper that works outside of a color picker.
Cryptomatte export for the Cycles render engine will be in a separate patch.

Reviewers: brecht

Reviewed By: brecht

Subscribers: brecht

Tags: #compositing

Differential Revision: https://developer.blender.org/D3531

2 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/blenloader/intern/readfile.c b/source/blender/blenloader/intern/readfile.c
index 4e845b9a60d..1def462b1ca 100644
--- a/source/blender/blenloader/intern/readfile.c
+++ b/source/blender/blenloader/intern/readfile.c
@@ -3161,6 +3161,10 @@ static void direct_link_nodetree(FileData *fd, bNodeTree *ntree)
 					direct_link_curvemapping(fd, node->storage);
 				else if (ELEM(node->type, CMP_NODE_IMAGE, CMP_NODE_R_LAYERS, CMP_NODE_VIEWER, CMP_NODE_SPLITVIEWER))
 					((ImageUser *)node->storage)->ok = 1;
+				else if (node->type==CMP_NODE_CRYPTOMATTE) {
+					NodeCryptomatte *nc = (NodeCryptomatte *) node->storage;
+					nc->matte_id = newdataadr(fd, nc->matte_id);
+				}
 			}
 			else if ( ntree->type==NTREE_TEXTURE) {
 				if (node->type==TEX_NODE_CURVE_RGB || node->type==TEX_NODE_CURVE_TIME)
diff --git a/source/blender/blenloader/intern/writefile.c b/source/blender/blenloader/intern/writefile.c
index e3a901f4211..4b64d0a3d3f 100644
--- a/source/blender/blenloader/intern/writefile.c
+++ b/source/blender/blenloader/intern/writefile.c
@@ -1077,6 +1077,13 @@ static void write_nodetree_nolib(WriteData *wd, bNodeTree *ntree)
 				}
 				writestruct_id(wd, DATA, node->typeinfo->storagename, 1, node->storage);
 			}
+			else if ((ntree->type == NTREE_COMPOSIT) && (node->type == CMP_NODE_CRYPTOMATTE)) {
+				NodeCryptomatte *nc = (NodeCryptomatte *)node->storage;
+				if (nc->matte_id) {
+					writedata(wd, DATA, strlen(nc->matte_id) + 1, nc->matte_id);
+				}
+				writestruct_id(wd, DATA, node->typeinfo->storagename, 1, node->storage);
+			}
 			else {
 				writestruct_id(wd, DATA, node->typeinfo->storagename, 1, node->storage);
 			}