Added transparency feature to node editor backdrop, similar to image editor. Alpha blending can be enabled by a button when "Use Backdrop" is selected.

1 files changed, 13 insertions, 1 deletions

diff --git a/source/blender/makesrna/intern/rna_space.c b/source/blender/makesrna/intern/rna_space.c
index 8b3734a7c46..8cf0d94d03e 100644
--- a/source/blender/makesrna/intern/rna_space.c
+++ b/source/blender/makesrna/intern/rna_space.c
@@ -2267,7 +2267,13 @@ static void rna_def_space_node(BlenderRNA *brna)
 		{SNODE_TEX_WORLD, "WORLD", ICON_WORLD_DATA, "World", "Edit texture nodes from World"},
 		{SNODE_TEX_BRUSH, "BRUSH", ICON_BRUSH_DATA, "Brush", "Edit texture nodes from Brush"},
 		{0, NULL, 0, NULL, NULL}};
-	
+
+	static EnumPropertyItem backdrop_channels_items[] = {
+		{0, "COLOR", ICON_IMAGE_RGB, "Color", "Draw image with RGB colors"},
+		{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"},
+		{0, NULL, 0, NULL, NULL}};
+
 	srna= RNA_def_struct(brna, "SpaceNodeEditor", "Space");
 	RNA_def_struct_sdna(srna, "SpaceNode");
 	RNA_def_struct_ui_text(srna, "Space Node Editor", "Node editor space data");
@@ -2317,6 +2323,12 @@ static void rna_def_space_node(BlenderRNA *brna)
 	RNA_def_property_float_sdna(prop, NULL, "yof");
 	RNA_def_property_ui_text(prop, "Backdrop Y", "Backdrop Y offset");
 	RNA_def_property_update(prop, NC_SPACE|ND_SPACE_NODE_VIEW, NULL);
+
+	prop= RNA_def_property(srna, "backdrop_channels", PROP_ENUM, PROP_NONE);
+	RNA_def_property_enum_bitflag_sdna(prop, NULL, "flag");
+	RNA_def_property_enum_items(prop, backdrop_channels_items);
+	RNA_def_property_ui_text(prop, "Draw Channels", "Channels of the image to draw");
+	RNA_def_property_update(prop, NC_SPACE|ND_SPACE_NODE_VIEW, NULL);
 }
 
 static void rna_def_space_logic(BlenderRNA *brna)