[gimp] app: add a huge switch() to gimp_layer_mode_get_composite_mode()

[Michael Natterer <mitch src gnome org>]

commit 7079d5f73056274fc7b99b965240eb37c433191d
Author: Michael Natterer <mitch gimp org>
Date:   Sat Jan 21 22:26:35 2017 +0100

    app: add a huge switch() to gimp_layer_mode_get_composite_mode()
    
    It's going to be used to the UI too and should return something
    to display, even if immutable.

 app/core/gimp-layer-modes.c |   87 ++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 86 insertions(+), 1 deletions(-)
---
diff --git a/app/core/gimp-layer-modes.c b/app/core/gimp-layer-modes.c
index 8b9a6e4..6453e44 100644
--- a/app/core/gimp-layer-modes.c
+++ b/app/core/gimp-layer-modes.c
@@ -268,7 +268,92 @@ gimp_layer_mode_get_composite_space (GimpLayerMode  mode)
 GimpLayerCompositeMode
 gimp_layer_mode_get_composite_mode (GimpLayerMode  mode)
 {
-  return GIMP_LAYER_COMPOSITE_SRC_ATOP;
+  switch (mode)
+    {
+    case GIMP_LAYER_MODE_NORMAL_NON_LINEAR:
+    case GIMP_LAYER_MODE_DISSOLVE:
+    case GIMP_LAYER_MODE_BEHIND:
+      return GIMP_LAYER_COMPOSITE_SRC_OVER;
+
+    case GIMP_LAYER_MODE_MULTIPLY_LEGACY:
+    case GIMP_LAYER_MODE_SCREEN_LEGACY:
+    case GIMP_LAYER_MODE_OVERLAY_LEGACY:
+    case GIMP_LAYER_MODE_DIFFERENCE_LEGACY:
+    case GIMP_LAYER_MODE_ADDITION_LEGACY:
+    case GIMP_LAYER_MODE_SUBTRACT_LEGACY:
+    case GIMP_LAYER_MODE_DARKEN_ONLY_LEGACY:
+    case GIMP_LAYER_MODE_LIGHTEN_ONLY_LEGACY:
+    case GIMP_LAYER_MODE_HSV_HUE_LEGACY:
+    case GIMP_LAYER_MODE_HSV_SATURATION_LEGACY:
+    case GIMP_LAYER_MODE_HSV_COLOR_LEGACY:
+    case GIMP_LAYER_MODE_HSV_VALUE_LEGACY:
+    case GIMP_LAYER_MODE_DIVIDE_LEGACY:
+    case GIMP_LAYER_MODE_DODGE_LEGACY:
+    case GIMP_LAYER_MODE_BURN_LEGACY:
+    case GIMP_LAYER_MODE_HARDLIGHT_LEGACY:
+    case GIMP_LAYER_MODE_SOFTLIGHT_LEGACY:
+    case GIMP_LAYER_MODE_GRAIN_EXTRACT_LEGACY:
+    case GIMP_LAYER_MODE_GRAIN_MERGE_LEGACY:
+      return GIMP_LAYER_COMPOSITE_SRC_ATOP;
+
+    case GIMP_LAYER_MODE_COLOR_ERASE:
+    case GIMP_LAYER_MODE_OVERLAY:
+      return GIMP_LAYER_COMPOSITE_SRC_ATOP;
+
+    case GIMP_LAYER_MODE_LCH_HUE:
+    case GIMP_LAYER_MODE_LCH_CHROMA:
+    case GIMP_LAYER_MODE_LCH_COLOR:
+    case GIMP_LAYER_MODE_LCH_LIGHTNESS:
+      return GIMP_LAYER_COMPOSITE_SRC_ATOP;
+
+    case GIMP_LAYER_MODE_NORMAL:
+      return GIMP_LAYER_COMPOSITE_SRC_OVER;
+
+    case GIMP_LAYER_MODE_MULTIPLY:
+    case GIMP_LAYER_MODE_SCREEN:
+    case GIMP_LAYER_MODE_DIFFERENCE:
+    case GIMP_LAYER_MODE_ADDITION:
+    case GIMP_LAYER_MODE_SUBTRACT:
+    case GIMP_LAYER_MODE_DARKEN_ONLY:
+    case GIMP_LAYER_MODE_LIGHTEN_ONLY:
+    case GIMP_LAYER_MODE_HSV_HUE:
+    case GIMP_LAYER_MODE_HSV_SATURATION:
+    case GIMP_LAYER_MODE_HSV_COLOR:
+    case GIMP_LAYER_MODE_HSV_VALUE:
+    case GIMP_LAYER_MODE_DIVIDE:
+    case GIMP_LAYER_MODE_DODGE:
+    case GIMP_LAYER_MODE_BURN:
+    case GIMP_LAYER_MODE_HARDLIGHT:
+    case GIMP_LAYER_MODE_SOFTLIGHT:
+    case GIMP_LAYER_MODE_GRAIN_EXTRACT:
+    case GIMP_LAYER_MODE_GRAIN_MERGE:
+      return GIMP_LAYER_COMPOSITE_SRC_ATOP;
+
+    case GIMP_LAYER_MODE_BEHIND_LINEAR:
+    case GIMP_LAYER_MODE_MULTIPLY_LINEAR:
+    case GIMP_LAYER_MODE_SCREEN_LINEAR:
+    case GIMP_LAYER_MODE_OVERLAY_LINEAR:
+    case GIMP_LAYER_MODE_DIFFERENCE_LINEAR:
+    case GIMP_LAYER_MODE_ADDITION_LINEAR:
+    case GIMP_LAYER_MODE_SUBTRACT_LINEAR:
+    case GIMP_LAYER_MODE_DARKEN_ONLY_LINEAR:
+    case GIMP_LAYER_MODE_LIGHTEN_ONLY_LINEAR:
+    case GIMP_LAYER_MODE_DIVIDE_LINEAR:
+    case GIMP_LAYER_MODE_DODGE_LINEAR:
+    case GIMP_LAYER_MODE_BURN_LINEAR:
+    case GIMP_LAYER_MODE_HARDLIGHT_LINEAR:
+    case GIMP_LAYER_MODE_SOFTLIGHT_LINEAR:
+    case GIMP_LAYER_MODE_GRAIN_EXTRACT_LINEAR:
+    case GIMP_LAYER_MODE_GRAIN_MERGE_LINEAR:
+      return GIMP_LAYER_COMPOSITE_SRC_ATOP;
+
+    case GIMP_LAYER_MODE_ERASE:
+    case GIMP_LAYER_MODE_REPLACE:
+    case GIMP_LAYER_MODE_ANTI_ERASE:
+      return GIMP_LAYER_COMPOSITE_SRC_OVER;
+  }
+
+  return GIMP_LAYER_COMPOSITE_SRC_OVER;
 }
 
 const gchar *