[gegl] bin: add configuration flag nearest_neighbor for high performance scaled blits

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

commit 8699b0665803ee2a1b7430ab2cb573a7d6cbf0f7
Author: Øyvind Kolås <pippin gimp org>
Date:   Fri Mar 22 22:27:23 2019 +0100

    bin: add configuration flag nearest_neighbor for high performance scaled blits

 bin/lua/init.lua | 1 +
 bin/mrg-gegl.c   | 7 ++++---
 bin/mrg-gegl.h   | 2 ++
 bin/ui-core.c    | 3 +++
 bin/ui.h         | 3 +++
 5 files changed, 13 insertions(+), 3 deletions(-)
---
diff --git a/bin/lua/init.lua b/bin/lua/init.lua
index 97bdb64f6..50a5dee05 100644
--- a/bin/lua/init.lua
+++ b/bin/lua/init.lua
@@ -74,6 +74,7 @@ struct _GeState {
   int          is_fit;
   int          show_bounding_box;
   float        dir_scale;
+  int          nearest_neighbor;
   float        render_quality; /* default (and in code swapped for preview_quality during preview rendering, 
this is the canonical read location for the value)  */
   float        preview_quality;
 
diff --git a/bin/mrg-gegl.c b/bin/mrg-gegl.c
index 8144e58e4..069b2c580 100644
--- a/bin/mrg-gegl.c
+++ b/bin/mrg-gegl.c
@@ -69,6 +69,7 @@ void mrg_gegl_buffer_blit (Mrg *mrg,
                            float u, float v,
                            float scale,
                            float preview_multiplier,
+                           int   nearest_neighbor,
                            int   color_manage_display)
 {
   float fake_factor = preview_multiplier;
@@ -165,7 +166,7 @@ void mrg_gegl_buffer_blit (Mrg *mrg,
       fmt = fmt_srgb;
     }
     gegl_buffer_get (buffer, &roi, scale / fake_factor, fmt, buf, width * 4,
-         GEGL_ABYSS_NONE);
+         GEGL_ABYSS_NONE | (nearest_neighbor?GEGL_BUFFER_FILTER_NEAREST:0));
     surface = cairo_image_surface_create_for_data (buf, CAIRO_FORMAT_RGB24, width, height, width * 4);
   }
 
@@ -204,6 +205,7 @@ void mrg_gegl_blit (Mrg *mrg,
                     float u, float v,
                     float scale,
                     float preview_multiplier,
+                    int nearest_neighbor,
                     int color_manage_display)
 {
   float fake_factor = preview_multiplier;
@@ -272,9 +274,8 @@ void mrg_gegl_blit (Mrg *mrg,
       fmt = fmt_srgb;
     }
 
-
     gegl_node_blit (node, scale / fake_factor, &roi, fmt, buf, width * 4,
-         GEGL_BLIT_DEFAULT);
+         GEGL_BLIT_DEFAULT | (nearest_neighbor?GEGL_BUFFER_FILTER_NEAREST:0));
   surface = cairo_image_surface_create_for_data (buf, CAIRO_FORMAT_RGB24, width, height, width * 4);
   }
 
diff --git a/bin/mrg-gegl.h b/bin/mrg-gegl.h
index f335d45dd..1bc15a186 100644
--- a/bin/mrg-gegl.h
+++ b/bin/mrg-gegl.h
@@ -11,6 +11,7 @@ void mrg_gegl_buffer_blit (Mrg *mrg,
                            float u, float v,
                            float scale,
                            float preview_multiplier,
+                           int   nearest_neighbor,
                            int   color_manage);
 
 
@@ -21,6 +22,7 @@ void mrg_gegl_blit (Mrg *mrg,
                     float u, float v,
                     float scale,
                     float preview_multiplier,
+                    int   nearest_neighbor,
                     int   color_manage);
 
 
diff --git a/bin/ui-core.c b/bin/ui-core.c
index 991111ad0..ae2e418f0 100644
--- a/bin/ui-core.c
+++ b/bin/ui-core.c
@@ -443,6 +443,7 @@ Setting settings[]=
   INT_PROP(show_bounding_box, "show bounding box of active node"),
   INT_PROP(show_controls, "show image viewer controls (maybe merge with show-graph and give better name)"),
   INT_PROP(slide_enabled, "slide show going"),
+  INT_PROP(nearest_neighbor, "nearest neighbor"),
   FLOAT_PROP(slide_pause, "display scale factor"),
 
 };
@@ -4781,6 +4782,7 @@ static void gegl_ui (Mrg *mrg, void *data)
                       o->u, o->v,
                       o->scale,
                       o->render_quality,
+                      o->nearest_neighbor,
                       o->color_managed_display);
      break;
      case GEGL_RENDERER_THREAD:
@@ -4795,6 +4797,7 @@ static void gegl_ui (Mrg *mrg, void *data)
                                o->u, o->v,
                                o->scale,
                                o->render_quality,
+                               o->nearest_neighbor,
                                o->color_managed_display);
          g_object_unref (buffer);
        } else {
diff --git a/bin/ui.h b/bin/ui.h
index 61765e703..7c7dcaec3 100644
--- a/bin/ui.h
+++ b/bin/ui.h
@@ -85,6 +85,9 @@ struct _GeState {
   int            is_fit;
   int            show_bounding_box;
   float          dir_scale;
+
+  int            nearest_neighbor;
+
   float          render_quality; /* default (and in code swapped for preview_quality during preview 
rendering, this is the canonical read location for the value)  */
   float          preview_quality;