[babl] extensions: add fast paths going from gray to premul alpha rgb - for resampling

[Øyvind Kolås <ok src gnome org>]

commit 3bac1a54a2c50bb8435ad573023bf4300a3e309a
Author: Øyvind Kolås <pippin gimp org>
Date:   Fri Dec 16 00:39:08 2016 +0100

    extensions: add fast paths going from gray to premul alpha rgb - for resampling

 extensions/gggl-lies.c |   25 +++++++++++++++++++++++++
 extensions/gggl.c      |   24 ++++++++++++++++++++++++
 2 files changed, 49 insertions(+), 0 deletions(-)
---
diff --git a/extensions/gggl-lies.c b/extensions/gggl-lies.c
index 5d50f5b..b8efc83 100644
--- a/extensions/gggl-lies.c
+++ b/extensions/gggl-lies.c
@@ -418,6 +418,29 @@ conv_rgbaF_rgbF (unsigned char *src, unsigned char *dst, long samples)
   return samples;
 }
 
+
+static long
+conv_gF_rgbaF (unsigned char *src, unsigned char *dst, long samples)
+{
+  long n = samples;
+
+  while (n--)
+    {
+      *(int *) dst   = (*(int *) src);
+      dst           += 4;
+      *(int *) dst   = (*(int *) src);
+      dst           += 4;
+      *(int *) dst   = (*(int *) src);
+      dst           += 4;
+      *(float *) dst = 1.0;
+      dst           += 4;
+      src           += 4;
+    }
+  return samples;
+}
+
+#define conv_gF_rgbAF conv_gF_rgbaF
+
 static long
 conv_rgbF_rgbaF (unsigned char *src, unsigned char *dst, long samples)
 {
@@ -840,6 +863,8 @@ init (void)
   o (gaF, ga8);
   o (gAF, gA8);
   o (gF, g8);
+  o (gF, rgbAF);
+  o (gF, rgbaF);
   o (ga8, gaF);
   o (gA8, gAF);
   o (g8, gF);
diff --git a/extensions/gggl.c b/extensions/gggl.c
index c4b8ce4..b01659f 100644
--- a/extensions/gggl.c
+++ b/extensions/gggl.c
@@ -607,6 +607,28 @@ conv_rgbA16_rgbaF (unsigned char *src, unsigned char *dst, long samples)
   return samples;
 }
 
+static long
+conv_gF_rgbaF (unsigned char *src, unsigned char *dst, long samples)
+{
+  long n = samples;
+
+  while (n--)
+    {
+      *(int *) dst   = (*(int *) src);
+      dst           += 4;
+      *(int *) dst   = (*(int *) src);
+      dst           += 4;
+      *(int *) dst   = (*(int *) src);
+      dst           += 4;
+      *(float *) dst = 1.0;
+      dst           += 4;
+      src           += 4;
+    }
+  return samples;
+}
+
+#define conv_gF_rgbAF conv_gF_rgbaF
+
 /*
    static long
    conv_rgb8_rgbaF (unsigned char *src,
@@ -1102,6 +1124,8 @@ init (void)
   o (gF, gaF);
   o (gF, gAF);
   o (gF, rgbF);
+  o (gF, rgbaF);
+  o (gF, rgbAF);
   o (gaF, rgbaF);
   o (gAF, rgbAF);
   o (rgbaF, rgb8);