[gegl] factor out mrg_blit from gegl ui

[Øyvind Kolås <ok src gnome org>]

commit 0a8d857b61f69e3d3f872d0f7dcadcf894755d13
Author: Øyvind Kolås <pippin gimp org>
Date:   Fri Nov 10 16:49:29 2017 +0100

    factor out mrg_blit from gegl ui

 bin/Makefile.am |    2 +-
 bin/mrg-gegl.c  |  133 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 bin/ui.c        |   95 +++------------------------------------
 3 files changed, 142 insertions(+), 88 deletions(-)
---
diff --git a/bin/Makefile.am b/bin/Makefile.am
index d4dfd20..d385bdb 100644
--- a/bin/Makefile.am
+++ b/bin/Makefile.am
@@ -43,7 +43,7 @@ gegl_SOURCES =                        \
 if HAVE_MRG
 if HAVE_GEXIV2
 if HAVE_SDL
-gegl_SOURCES += ui.c
+gegl_SOURCES += ui.c mrg-gegl.c
 AM_CFLAGS += $(SDL_CFLAGS)
 AM_LDFLAGS += $(SDL_LIBS)
 endif
diff --git a/bin/mrg-gegl.c b/bin/mrg-gegl.c
new file mode 100644
index 0000000..7ced6ec
--- /dev/null
+++ b/bin/mrg-gegl.c
@@ -0,0 +1,133 @@
+/* This file is part of GEGL editor -- an mrg frontend for GEGL
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright (C) 2015 Øyvind Kolås pippin gimp org
+ */
+
+/* The code in this file is an image viewer/editor written using microraptor
+ * gui and GEGL. It renders the UI directly from GEGLs data structures.
+ */
+
+#define _BSD_SOURCE
+#define _DEFAULT_SOURCE
+
+#include "config.h"
+
+#if HAVE_MRG
+
+#include <ctype.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <mrg.h>
+#include <gegl.h>
+#include <gexiv2/gexiv2.h>
+#include <gegl-paramspecs.h>
+#include <SDL.h>
+#include <gegl-audio-fragment.h>
+
+static unsigned char *copy_buf = NULL;
+static int copy_buf_len = 0;
+
+void mrg_gegl_blit (Mrg *mrg,
+                    float x0, float y0,
+                    float width, float height,
+                    GeglNode *node,
+                    float u, float v,
+                    float scale,
+                    float preview_multiplier);
+
+void mrg_gegl_blit (Mrg *mrg,
+                    float x0, float y0,
+                    float width, float height,
+                    GeglNode *node,
+                    float u, float v,
+                    float scale,
+                    float preview_multiplier)
+{
+  float fake_factor = preview_multiplier;
+  GeglRectangle bounds;
+
+  cairo_t *cr = mrg_cr (mrg);
+  cairo_surface_t *surface = NULL;
+
+  if (!node)
+    return;
+
+  bounds = gegl_node_get_bounding_box (node);
+
+  if (width == -1 && height == -1)
+  {
+    width  = bounds.width;
+    height = bounds.height;
+  }
+
+  if (width == -1)
+    width = bounds.width * height / bounds.height;
+  if (height == -1)
+    height = bounds.height * width / bounds.width;
+
+  width /= fake_factor;
+  height /= fake_factor;
+  u /= fake_factor;
+  v /= fake_factor;
+
+  if (copy_buf_len < width * height * 4)
+  {
+    if (copy_buf)
+      free (copy_buf);
+    copy_buf_len = width * height * 4;
+    copy_buf = malloc (copy_buf_len);
+  }
+  {
+    static int foo = 0;
+    unsigned char *buf = copy_buf;
+    GeglRectangle roi = {u, v, width, height};
+    static const Babl *fmt = NULL;
+
+foo++;
+    if (!fmt) fmt = babl_format ("cairo-RGB24");
+    gegl_node_blit (node, scale / fake_factor, &roi, fmt, buf, width * 4,
+         GEGL_BLIT_DEFAULT);
+  surface = cairo_image_surface_create_for_data (buf, CAIRO_FORMAT_RGB24, width, height, width * 4);
+  }
+
+  cairo_save (cr);
+  cairo_surface_set_device_scale (surface, 1.0/fake_factor, 1.0/fake_factor);
+
+  width *= fake_factor;
+  height *= fake_factor;
+  u *= fake_factor;
+  v *= fake_factor;
+
+  cairo_rectangle (cr, x0, y0, width, height);
+
+  cairo_clip (cr);
+  cairo_translate (cr, x0 * fake_factor, y0 * fake_factor);
+  cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_NEAREST);
+  cairo_set_source_surface (cr, surface, 0, 0);
+
+  cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
+  cairo_paint (cr);
+  cairo_surface_destroy (surface);
+  cairo_restore (cr);
+}
+
+
+#endif
diff --git a/bin/ui.c b/bin/ui.c
index 4522033..de4339e 100644
--- a/bin/ui.c
+++ b/bin/ui.c
@@ -46,6 +46,14 @@
  */
 // #define DEBUG_OP_LIST  1
 
+void mrg_gegl_blit (Mrg *mrg,
+                    float x0, float y0,
+                    float width, float height,
+                    GeglNode *node,
+                    float u, float v,
+                    float scale,
+                    float preview_multiplier);
+
 
 static int audio_len    = 0;
 static int audio_pos    = 0;
@@ -158,14 +166,6 @@ static int is_gegl_path (const char *path);
 
 static void contrasty_stroke (cairo_t *cr);
 
-static void mrg_gegl_blit (Mrg *mrg,
-                           float x0, float y0,
-                           float width, float height,
-                           GeglNode *node,
-                           float u, float v,
-                           float scale,
-                           float preview_multiplier);
-
 gchar *get_thumb_path (const char *path);
 gchar *get_thumb_path (const char *path)
 {
@@ -1198,85 +1198,6 @@ static void contrasty_stroke (cairo_t *cr)
   cairo_stroke (cr);
 }
 
-static unsigned char *copy_buf = NULL;
-static int copy_buf_len = 0;
-
-static void mrg_gegl_blit (Mrg *mrg,
-                           float x0, float y0,
-                           float width, float height,
-                           GeglNode *node,
-                           float u, float v,
-                           float scale,
-                           float preview_multiplier)
-{
-  float fake_factor = preview_multiplier;
-  GeglRectangle bounds;
-
-  cairo_t *cr = mrg_cr (mrg);
-  cairo_surface_t *surface = NULL;
-
-  if (!node)
-    return;
-
-  bounds = gegl_node_get_bounding_box (node);
-
-  if (width == -1 && height == -1)
-  {
-    width  = bounds.width;
-    height = bounds.height;
-  }
-
-  if (width == -1)
-    width = bounds.width * height / bounds.height;
-  if (height == -1)
-    height = bounds.height * width / bounds.width;
-
-  width /= fake_factor;
-  height /= fake_factor;
-  u /= fake_factor;
-  v /= fake_factor;
-
-  if (copy_buf_len < width * height * 4)
-  {
-    if (copy_buf)
-      free (copy_buf);
-    copy_buf_len = width * height * 4;
-    copy_buf = malloc (copy_buf_len);
-  }
-  {
-    static int foo = 0;
-    unsigned char *buf = copy_buf;
-    GeglRectangle roi = {u, v, width, height};
-    static const Babl *fmt = NULL;
-
-foo++;
-    if (!fmt) fmt = babl_format ("cairo-RGB24");
-    gegl_node_blit (node, scale / fake_factor, &roi, fmt, buf, width * 4,
-         GEGL_BLIT_DEFAULT);
-  surface = cairo_image_surface_create_for_data (buf, CAIRO_FORMAT_RGB24, width, height, width * 4);
-  }
-
-  cairo_save (cr);
-  cairo_surface_set_device_scale (surface, 1.0/fake_factor, 1.0/fake_factor);
-
-  width *= fake_factor;
-  height *= fake_factor;
-  u *= fake_factor;
-  v *= fake_factor;
-
-  cairo_rectangle (cr, x0, y0, width, height);
-
-  cairo_clip (cr);
-  cairo_translate (cr, x0 * fake_factor, y0 * fake_factor);
-  cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_NEAREST);
-  cairo_set_source_surface (cr, surface, 0, 0);
-
-  cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
-  cairo_paint (cr);
-  cairo_surface_destroy (surface);
-  cairo_restore (cr);
-}
-
 static void load_path (State *o)
 {
   char *path;