[gegl] buffer: add some branch hints in sampler code

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 7387e48360d029de633a0ba3842ff84768a8a79f
Author: Øyvind Kolås <pippin gimp org>
Date:   Tue Aug 17 21:31:12 2021 +0200

    buffer: add some branch hints in sampler code

 gegl/buffer/gegl-sampler-linear.c | 4 ++--
 gegl/buffer/gegl-sampler.c        | 8 ++++----
 2 files changed, 6 insertions(+), 6 deletions(-)
---
diff --git a/gegl/buffer/gegl-sampler-linear.c b/gegl/buffer/gegl-sampler-linear.c
index cb4b722cd..9222fbb7e 100644
--- a/gegl/buffer/gegl-sampler-linear.c
+++ b/gegl/buffer/gegl-sampler-linear.c
@@ -186,8 +186,8 @@ gegl_sampler_linear_get (      GeglSampler       *self,
                                void              *output,
                                GeglAbyssPolicy    repeat_mode)
 {
-  if (! _gegl_sampler_box_get (self, absolute_x, absolute_y, scale,
-                               output, repeat_mode, 4))
+  if (G_LIKELY(! _gegl_sampler_box_get (self, absolute_x, absolute_y, scale,
+                               output, repeat_mode, 4)))
   {
     gfloat result[5];
 
diff --git a/gegl/buffer/gegl-sampler.c b/gegl/buffer/gegl-sampler.c
index f630cceb0..efdab84ef 100644
--- a/gegl/buffer/gegl-sampler.c
+++ b/gegl/buffer/gegl-sampler.c
@@ -176,7 +176,7 @@ gegl_sampler_get (GeglSampler       *self,
   if (G_UNLIKELY(!isfinite (y)))
     y = 0.0;
 
-  if (self->lvel)
+  if (G_UNLIKELY (self->lvel))
   {
     double factor = 1.0 / (1 << self->lvel);
     GeglRectangle rect={int_floorf (x * factor), int_floorf (y * factor),1,1};
@@ -184,7 +184,7 @@ gegl_sampler_get (GeglSampler       *self,
     return;
   }
 
-  if (gegl_buffer_ext_flush)
+  if (G_UNLIKELY (gegl_buffer_ext_flush))
     {
       GeglRectangle rect={x,y,1,1};
       gegl_buffer_ext_flush (self->buffer, &rect);
@@ -333,7 +333,7 @@ gegl_sampler_get_from_mipmap (GeglSampler    *sampler,
   const gint maximum_width  = GEGL_SAMPLER_MAXIMUM_WIDTH;
   const gint maximum_height = GEGL_SAMPLER_MAXIMUM_HEIGHT;
 
-  if (gegl_buffer_ext_flush)
+  if (G_UNLIKELY (gegl_buffer_ext_flush))
     {
       GeglRectangle rect = {x, y, 1, 1};
       gegl_buffer_ext_flush (sampler->buffer, &rect);
@@ -504,7 +504,7 @@ _gegl_buffer_sample_at_level (GeglBuffer        *buffer,
       return;
     }
 
-  if (!format)
+  if (G_UNLIKELY (!format))
     format = buffer->soft_format;
 
   sampler = gegl_buffer_sampler_new_at_level (buffer,