[gimp] app: move factored out compositing to common header

[Øyvind Kolås <ok src gnome org>]

commit be8c2015a0a320cd1213519cfabcb288555f17a3
Author: Øyvind Kolås <pippin gimp org>
Date:   Fri Jan 13 18:02:06 2017 +0100

    app: move factored out compositing to common header

 .../layer-modes/gimpoperationlchchroma.c           |   36 ------------------
 .../layer-modes/gimpoperationpointlayermode.h      |   38 ++++++++++++++++++++
 2 files changed, 38 insertions(+), 36 deletions(-)
---
diff --git a/app/operations/layer-modes/gimpoperationlchchroma.c 
b/app/operations/layer-modes/gimpoperationlchchroma.c
index 2854e4c..b1bf8d7 100644
--- a/app/operations/layer-modes/gimpoperationlchchroma.c
+++ b/app/operations/layer-modes/gimpoperationlchchroma.c
@@ -122,42 +122,6 @@ chroma_pre_process (const Babl   *from_fish,
   babl_process (to_fish, out, out, samples);
 }
 
-static void
-gimp_operation_layer_composite (const gfloat *in,
-                                const gfloat *layer,
-                                const gfloat *mask,
-                                gfloat       *out,
-                                gfloat        opacity,
-                                glong         samples)
-{
-  while (samples--)
-    {
-      gfloat comp_alpha = layer[ALPHA] * opacity;
-      if (mask)
-        comp_alpha *= *mask++;
-      if (comp_alpha != 0.0f)
-        {
-          out[RED]   = out[RED]   * comp_alpha + in[RED]   * (1.0f - comp_alpha);
-          out[GREEN] = out[GREEN] * comp_alpha + in[GREEN] * (1.0f - comp_alpha);
-          out[BLUE]  = out[BLUE]  * comp_alpha + in[BLUE]  * (1.0f - comp_alpha);
-        }
-      else
-        {
-          gint b;
-          for (b = RED; b < ALPHA; b++)
-            {
-              out[b] = in[b];
-            }
-        }
-
-      out[ALPHA] = in[ALPHA];
-
-      in    += 4;
-      layer += 4;
-      out   += 4;
-    }
-}
-
 gboolean
 gimp_operation_lch_chroma_process_pixels_linear (gfloat              *in,
                                                  gfloat              *layer,
diff --git a/app/operations/layer-modes/gimpoperationpointlayermode.h 
b/app/operations/layer-modes/gimpoperationpointlayermode.h
index 461fc25..af0a6e0 100644
--- a/app/operations/layer-modes/gimpoperationpointlayermode.h
+++ b/app/operations/layer-modes/gimpoperationpointlayermode.h
@@ -52,4 +52,42 @@ struct _GimpOperationPointLayerMode
 GType   gimp_operation_point_layer_mode_get_type (void) G_GNUC_CONST;
 
 
+static inline void
+gimp_operation_layer_composite (const gfloat *in,
+                                const gfloat *layer,
+                                const gfloat *mask,
+                                gfloat       *out,
+                                gfloat        opacity,
+                                glong         samples)
+{
+  while (samples--)
+    {
+      gfloat comp_alpha = layer[ALPHA] * opacity;
+      if (mask)
+        comp_alpha *= *mask++;
+      if (comp_alpha != 0.0f)
+        {
+          out[RED]   = out[RED]   * comp_alpha + in[RED]   * (1.0f - comp_alpha);
+          out[GREEN] = out[GREEN] * comp_alpha + in[GREEN] * (1.0f - comp_alpha);
+          out[BLUE]  = out[BLUE]  * comp_alpha + in[BLUE]  * (1.0f - comp_alpha);
+        }
+      else
+        {
+          gint b;
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+    }
+}
+
+
+
 #endif /* __GIMP_OPERATION_POINT_LAYER_MODE_H__ */