Fix T67832: Camera Background Images View Transform

This patch will apply the view transform when a movie clip is used as
camera background image. It does this by rendering the image in the
color buffer when it needs the view transform. For other images it uses
the overlay buffer.

Reviewed By: Clément Foucault

Differential Revision: https://developer.blender.org/D7067

2 files changed, 5 insertions, 0 deletions

diff --git a/source/blender/draw/intern/DRW_render.h b/source/blender/draw/intern/DRW_render.h
index 6f40e04ab7e..336e6e75659 100644
--- a/source/blender/draw/intern/DRW_render.h
+++ b/source/blender/draw/intern/DRW_render.h
@@ -347,6 +347,8 @@ typedef enum {
   /** Use dual source blending. WARNING: Only one color buffer allowed. */
   DRW_STATE_BLEND_CUSTOM = (9 << 11),
   DRW_STATE_LOGIC_INVERT = (10 << 11),
+  DRW_STATE_BLEND_ALPHA_UNDER_PREMUL = (11 << 11),
+
 
   DRW_STATE_IN_FRONT_SELECT = (1 << 27),
   DRW_STATE_SHADOW_OFFSET = (1 << 28),
diff --git a/source/blender/draw/intern/draw_manager_exec.c b/source/blender/draw/intern/draw_manager_exec.c
index 808b5cc675b..8cf96251e84 100644
--- a/source/blender/draw/intern/draw_manager_exec.c
+++ b/source/blender/draw/intern/draw_manager_exec.c
@@ -203,6 +203,9 @@ void drw_state_set(DRWState state)
     case DRW_STATE_LOGIC_INVERT:
       blend = GPU_BLEND_INVERT;
       break;
+    case DRW_STATE_BLEND_ALPHA_UNDER_PREMUL:
+      blend = GPU_BLEND_ALPHA_UNDER_PREMUL;
+      break;
     default:
       blend = GPU_BLEND_NONE;
       break;