[gimp] app: remove thin_region(), turns out that gimp:shrink was not slow after all

[Michael Natterer <mitch src gnome org>]

commit fa072f0cd426264a757eb3eb7a52fde21069a8fc
Author: Michael Natterer <mitch gimp org>
Date:   Sun Mar 25 23:20:03 2012 +0200

    app: remove thin_region(), turns out that gimp:shrink was not slow after all

 app/core/gimpchannel.c        |   40 +++------
 app/paint-funcs/paint-funcs.c |  180 -----------------------------------------
 app/paint-funcs/paint-funcs.h |    5 -
 3 files changed, 13 insertions(+), 212 deletions(-)
---
diff --git a/app/core/gimpchannel.c b/app/core/gimpchannel.c
index a3174b2..623e90c 100644
--- a/app/core/gimpchannel.c
+++ b/app/core/gimpchannel.c
@@ -1540,6 +1540,7 @@ gimp_channel_real_shrink (GimpChannel *channel,
                           gboolean     edge_lock,
                           gboolean     push_undo)
 {
+  GeglNode *shrink;
   gint      x1, y1, x2, y2;
 
   if (radius_x == 0 && radius_y == 0)
@@ -1575,35 +1576,20 @@ gimp_channel_real_shrink (GimpChannel *channel,
   else
     gimp_drawable_invalidate_boundary (GIMP_DRAWABLE (channel));
 
-  if (gimp_use_gegl (gimp_item_get_image (GIMP_ITEM (channel))->gimp))
-    {
-      GeglNode *shrink;
-
-      shrink = gegl_node_new_child (NULL,
-                                    "operation", "gimp:shrink",
-                                    "radius-x",  radius_x,
-                                    "radius-y",  radius_y,
-                                    "edge-lock", edge_lock,
-                                    NULL);
-
-      gimp_apply_operation (gimp_drawable_get_buffer (GIMP_DRAWABLE (channel)),
-                            NULL, NULL,
-                            shrink,
-                            gimp_drawable_get_buffer (GIMP_DRAWABLE (channel)),
-                            NULL);
-
-      g_object_unref (shrink);
-    }
-  else
-    {
-      PixelRegion bPR;
+  shrink = gegl_node_new_child (NULL,
+                                "operation", "gimp:shrink",
+                                "radius-x",  radius_x,
+                                "radius-y",  radius_y,
+                                "edge-lock", edge_lock,
+                                NULL);
 
-      pixel_region_init (&bPR,
-                         gimp_drawable_get_tiles (GIMP_DRAWABLE (channel)),
-                         x1, y1, (x2 - x1), (y2 - y1), TRUE);
+  gimp_apply_operation (gimp_drawable_get_buffer (GIMP_DRAWABLE (channel)),
+                        NULL, NULL,
+                        shrink,
+                        gimp_drawable_get_buffer (GIMP_DRAWABLE (channel)),
+                        NULL);
 
-      thin_region (&bPR, radius_x, radius_y, edge_lock);
-    }
+  g_object_unref (shrink);
 
   channel->bounds_known = FALSE;
 
diff --git a/app/paint-funcs/paint-funcs.c b/app/paint-funcs/paint-funcs.c
index c998226..97a605c 100644
--- a/app/paint-funcs/paint-funcs.c
+++ b/app/paint-funcs/paint-funcs.c
@@ -2240,186 +2240,6 @@ fatten_region (PixelRegion *region,
   g_free (out);
 }
 
-void
-thin_region (PixelRegion *region,
-             gint16       xradius,
-             gint16       yradius,
-             gboolean     edge_lock)
-{
-  /*
-     pretty much the same as fatten_region only different
-     blame all bugs in this function on jaycox gimp org
-  */
-  /* If edge_lock is true  we assume that pixels outside the region
-     we are passed are identical to the edge pixels.
-     If edge_lock is false, we assume that pixels outside the region are 0
-  */
-  register gint32 i, j, x, y;
-  guchar  **buf;  /* caches the the region's pixels */
-  guchar   *out;  /* holds the new scan line we are computing */
-  guchar  **max;  /* caches the smallest values for each column */
-  gint16   *circ; /* holds the y coords of the filter's mask */
-  gint16    last_max, last_index;
-
-  guchar   *buffer;
-  gint      buffer_size;
-
-  if (xradius <= 0 || yradius <= 0)
-    return;
-
-  max = g_new (guchar *, region->w + 2 * xradius);
-  buf = g_new (guchar *, yradius + 1);
-
-  for (i = 0; i < yradius + 1; i++)
-    buf[i] = g_new (guchar, region->w);
-
-  buffer_size = (region->w + 2 * xradius + 1) * (yradius + 1);
-  buffer = g_new (guchar, buffer_size);
-
-  if (edge_lock)
-    memset(buffer, 255, buffer_size);
-  else
-    memset(buffer, 0, buffer_size);
-
-  for (i = 0; i < region->w + 2 * xradius; i++)
-    {
-      if (i < xradius)
-        {
-          if (edge_lock)
-            max[i] = buffer;
-          else
-            max[i] = &buffer[(yradius + 1) * (region->w + xradius)];
-        }
-      else if (i < region->w + xradius)
-        {
-          max[i] = &buffer[(yradius + 1) * (i - xradius)];
-        }
-      else
-        {
-          if (edge_lock)
-            max[i] = &buffer[(yradius + 1) * (region->w + xradius - 1)];
-          else
-            max[i] = &buffer[(yradius + 1) * (region->w + xradius)];
-        }
-    }
-
-  if (! edge_lock)
-    for (j = 0 ; j < xradius + 1; j++)
-      max[0][j] = 0;
-
-  /* offset the max pointer by xradius so the range of the array
-     is [-xradius] to [region->w + xradius] */
-  max += xradius;
-
-  out = g_new (guchar, region->w);
-
-  circ = g_new (gint16, 2 * xradius + 1);
-  compute_border (circ, xradius, yradius);
-
- /* offset the circ pointer by xradius so the range of the array
-    is [-xradius] to [xradius] */
-  circ += xradius;
-
-  for (i = 0; i < yradius && i < region->h; i++) /* load top of image */
-    pixel_region_get_row (region,
-                          region->x, region->y + i, region->w, buf[i + 1], 1);
-  if (edge_lock)
-    memcpy (buf[0], buf[1], region->w);
-  else
-    memset (buf[0], 0, region->w);
-
-
-  for (x = 0; x < region->w; x++) /* set up max for top of image */
-    {
-      max[x][0] = buf[0][x];
-
-      for (j = 1; j < yradius + 1; j++)
-        max[x][j] = MIN(buf[j][x], max[x][j-1]);
-    }
-
-  for (y = 0; y < region->h; y++)
-    {
-      rotate_pointers (buf, yradius + 1);
-
-      if (y < region->h - yradius)
-        pixel_region_get_row (region,
-                              region->x, region->y + y + yradius, region->w,
-                              buf[yradius], 1);
-      else if (edge_lock)
-        memcpy (buf[yradius], buf[yradius - 1], region->w);
-      else
-        memset (buf[yradius], 0, region->w);
-
-      for (x = 0 ; x < region->w; x++) /* update max array */
-        {
-          for (i = yradius; i > 0; i--)
-            max[x][i] = MIN (MIN (max[x][i - 1], buf[i - 1][x]), buf[i][x]);
-
-          max[x][0] = buf[0][x];
-        }
-
-      last_max =  max[0][circ[-1]];
-      last_index = 0;
-
-      for (x = 0 ; x < region->w; x++) /* render scan line */
-        {
-          last_index--;
-
-          if (last_index >= 0)
-            {
-              if (last_max == 0)
-                {
-                  out[x] = 0;
-                }
-              else
-                {
-                  last_max = 255;
-
-                  for (i = xradius; i >= 0; i--)
-                    if (last_max > max[x + i][circ[i]])
-                      {
-                        last_max = max[x + i][circ[i]];
-                        last_index = i;
-                      }
-
-                  out[x] = last_max;
-                }
-            }
-          else
-            {
-              last_index = xradius;
-              last_max = max[x + xradius][circ[xradius]];
-
-              for (i = xradius - 1; i >= -xradius; i--)
-                if (last_max > max[x + i][circ[i]])
-                  {
-                    last_max = max[x + i][circ[i]];
-                    last_index = i;
-                  }
-
-              out[x] = last_max;
-            }
-        }
-
-      pixel_region_set_row (region, region->x, region->y + y, region->w, out);
-    }
-
-  /* undo the offsets to the pointers so we can free the malloced memmory */
-  circ -= xradius;
-  max -= xradius;
-
-  /* free the memmory */
-  g_free (circ);
-  g_free (buffer);
-  g_free (max);
-
-  for (i = 0; i < yradius + 1; i++)
-    g_free (buf[i]);
-
-  g_free (buf);
-  g_free (out);
-}
-
 /*  Simple convolution filter to smooth a mask (1bpp).  */
 void
 smooth_region (PixelRegion *region)
diff --git a/app/paint-funcs/paint-funcs.h b/app/paint-funcs/paint-funcs.h
index bc5c27d..74ebe79 100644
--- a/app/paint-funcs/paint-funcs.h
+++ b/app/paint-funcs/paint-funcs.h
@@ -296,11 +296,6 @@ gfloat shapeburst_region                  (PixelRegion      *srcPR,
                                            GimpProgressFunc  progress_callback,
                                            gpointer          progress_data);
 
-void  thin_region                         (PixelRegion *region,
-                                           gint16       xradius,
-                                           gint16       yradius,
-                                           gboolean     edge_lock);
-
 void  fatten_region                       (PixelRegion *region,
                                            gint16       xradius,
                                            gint16       yradius);