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-rw-r--r--app/operations/gimpoperationshrink.c443
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diff --git a/app/operations/gimpoperationshrink.c b/app/operations/gimpoperationshrink.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationshrink.c
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "gimpoperationshrink.h"
+
+
+enum
+{
+ PROP_0,
+ PROP_RADIUS_X,
+ PROP_RADIUS_Y,
+ PROP_EDGE_LOCK
+};
+
+
+static void gimp_operation_shrink_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+static void gimp_operation_shrink_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+
+static void gimp_operation_shrink_prepare (GeglOperation *operation);
+static GeglRectangle
+ gimp_operation_shrink_get_required_for_output (GeglOperation *self,
+ const gchar *input_pad,
+ const GeglRectangle *roi);
+static GeglRectangle
+ gimp_operation_shrink_get_cached_region (GeglOperation *self,
+ const GeglRectangle *roi);
+
+static gboolean gimp_operation_shrink_process (GeglOperation *operation,
+ GeglBuffer *input,
+ GeglBuffer *output,
+ const GeglRectangle *roi,
+ gint level);
+
+
+G_DEFINE_TYPE (GimpOperationShrink, gimp_operation_shrink,
+ GEGL_TYPE_OPERATION_FILTER)
+
+#define parent_class gimp_operation_shrink_parent_class
+
+
+static void
+gimp_operation_shrink_class_init (GimpOperationShrinkClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
+ GeglOperationFilterClass *filter_class = GEGL_OPERATION_FILTER_CLASS (klass);
+
+ object_class->set_property = gimp_operation_shrink_set_property;
+ object_class->get_property = gimp_operation_shrink_get_property;
+
+ gegl_operation_class_set_keys (operation_class,
+ "name", "gimp:shrink",
+ "categories", "gimp",
+ "description", "GIMP Shrink operation",
+ NULL);
+
+ operation_class->prepare = gimp_operation_shrink_prepare;
+ operation_class->get_required_for_output = gimp_operation_shrink_get_required_for_output;
+ operation_class->get_cached_region = gimp_operation_shrink_get_cached_region;
+ operation_class->threaded = FALSE;
+
+ filter_class->process = gimp_operation_shrink_process;
+
+ g_object_class_install_property (object_class, PROP_RADIUS_X,
+ g_param_spec_int ("radius-x",
+ "Radius X",
+ "Shrink radius in X diection",
+ 1, 2342, 1,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_RADIUS_Y,
+ g_param_spec_int ("radius-y",
+ "Radius Y",
+ "Shrink radius in Y diection",
+ 1, 2342, 1,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_EDGE_LOCK,
+ g_param_spec_boolean ("edge-lock",
+ "Edge Lock",
+ "Shrink from border",
+ FALSE,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_shrink_init (GimpOperationShrink *self)
+{
+}
+
+static void
+gimp_operation_shrink_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpOperationShrink *self = GIMP_OPERATION_SHRINK (object);
+
+ switch (property_id)
+ {
+ case PROP_RADIUS_X:
+ g_value_set_int (value, self->radius_x);
+ break;
+
+ case PROP_RADIUS_Y:
+ g_value_set_int (value, self->radius_y);
+ break;
+
+ case PROP_EDGE_LOCK:
+ g_value_set_boolean (value, self->edge_lock);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_operation_shrink_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpOperationShrink *self = GIMP_OPERATION_SHRINK (object);
+
+ switch (property_id)
+ {
+ case PROP_RADIUS_X:
+ self->radius_x = g_value_get_int (value);
+ break;
+
+ case PROP_RADIUS_Y:
+ self->radius_y = g_value_get_int (value);
+ break;
+
+ case PROP_EDGE_LOCK:
+ self->edge_lock = g_value_get_boolean (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_operation_shrink_prepare (GeglOperation *operation)
+{
+ const Babl *space = gegl_operation_get_source_space (operation, "input");
+ gegl_operation_set_format (operation, "input", babl_format_with_space ("Y float", space));
+ gegl_operation_set_format (operation, "output", babl_format_with_space ("Y float", space));
+}
+
+static GeglRectangle
+gimp_operation_shrink_get_required_for_output (GeglOperation *self,
+ const gchar *input_pad,
+ const GeglRectangle *roi)
+{
+ return *gegl_operation_source_get_bounding_box (self, "input");
+}
+
+static GeglRectangle
+gimp_operation_shrink_get_cached_region (GeglOperation *self,
+ const GeglRectangle *roi)
+{
+ return *gegl_operation_source_get_bounding_box (self, "input");
+}
+
+static void
+compute_border (gint16 *circ,
+ guint16 xradius,
+ guint16 yradius)
+{
+ gint32 i;
+ gint32 diameter = xradius * 2 + 1;
+ gdouble tmp;
+
+ for (i = 0; i < diameter; i++)
+ {
+ if (i > xradius)
+ tmp = (i - xradius) - 0.5;
+ else if (i < xradius)
+ tmp = (xradius - i) - 0.5;
+ else
+ tmp = 0.0;
+
+ circ[i] = RINT (yradius /
+ (gdouble) xradius * sqrt (SQR (xradius) - SQR (tmp)));
+ }
+}
+
+static inline void
+rotate_pointers (gfloat **p,
+ guint32 n)
+{
+ guint32 i;
+ gfloat *tmp;
+
+ tmp = p[0];
+
+ for (i = 0; i < n - 1; i++)
+ p[i] = p[i + 1];
+
+ p[i] = tmp;
+}
+
+static gboolean
+gimp_operation_shrink_process (GeglOperation *operation,
+ GeglBuffer *input,
+ GeglBuffer *output,
+ const GeglRectangle *roi,
+ gint level)
+{
+ /* 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
+ */
+ GimpOperationShrink *self = GIMP_OPERATION_SHRINK (operation);
+ const Babl *input_format = babl_format ("Y float");
+ const Babl *output_format = babl_format ("Y float");
+ gint32 i, j, x, y;
+ gfloat **buf; /* caches the the region's pixels */
+ gfloat *out; /* holds the new scan line we are computing */
+ gfloat **max; /* caches the smallest values for each column */
+ gint16 *circ; /* holds the y coords of the filter's mask */
+ gfloat last_max;
+ gint16 last_index;
+ gfloat *buffer;
+ gint buffer_size;
+
+ max = g_new (gfloat *, roi->width + 2 * self->radius_x);
+ buf = g_new (gfloat *, self->radius_y + 1);
+
+ for (i = 0; i < self->radius_y + 1; i++)
+ buf[i] = g_new (gfloat, roi->width);
+
+ buffer_size = (roi->width+ 2 * self->radius_x + 1) * (self->radius_y + 1);
+ buffer = g_new (gfloat, buffer_size);
+
+ if (self->edge_lock)
+ {
+ for (i = 0; i < buffer_size; i++)
+ buffer[i] = 1.0;
+ }
+ else
+ {
+ memset (buffer, 0, buffer_size * sizeof (gfloat));
+ }
+
+ for (i = 0; i < roi->width + 2 * self->radius_x; i++)
+ {
+ if (i < self->radius_x)
+ {
+ if (self->edge_lock)
+ max[i] = buffer;
+ else
+ max[i] = &buffer[(self->radius_y + 1) * (roi->width + self->radius_x)];
+ }
+ else if (i < roi->width + self->radius_x)
+ {
+ max[i] = &buffer[(self->radius_y + 1) * (i - self->radius_x)];
+ }
+ else
+ {
+ if (self->edge_lock)
+ max[i] = &buffer[(self->radius_y + 1) * (roi->width + self->radius_x - 1)];
+ else
+ max[i] = &buffer[(self->radius_y + 1) * (roi->width + self->radius_x)];
+ }
+ }
+
+ if (! self->edge_lock)
+ for (j = 0 ; j < self->radius_y + 1; j++)
+ max[0][j] = 0.0;
+
+ /* offset the max pointer by self->radius_x so the range of the
+ * array is [-self->radius_x] to [roi->width + self->radius_x]
+ */
+ max += self->radius_x;
+
+ out = g_new (gfloat, roi->width);
+
+ circ = g_new (gint16, 2 * self->radius_x + 1);
+ compute_border (circ, self->radius_x, self->radius_y);
+
+ /* offset the circ pointer by self->radius_x so the range of the
+ * array is [-self->radius_x] to [self->radius_x]
+ */
+ circ += self->radius_x;
+
+ for (i = 0; i < self->radius_y && i < roi->height; i++) /* load top of image */
+ gegl_buffer_get (input,
+ GEGL_RECTANGLE (roi->x, roi->y + i,
+ roi->width, 1),
+ 1.0, input_format, buf[i + 1],
+ GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+ if (self->edge_lock)
+ memcpy (buf[0], buf[1], roi->width * sizeof (gfloat));
+ else
+ memset (buf[0], 0, roi->width * sizeof (gfloat));
+
+ for (x = 0; x < roi->width; x++) /* set up max for top of image */
+ {
+ max[x][0] = buf[0][x];
+
+ for (j = 1; j < self->radius_y + 1; j++)
+ max[x][j] = MIN (buf[j][x], max[x][j - 1]);
+ }
+
+ for (y = 0; y < roi->height; y++)
+ {
+ rotate_pointers (buf, self->radius_y + 1);
+
+ if (y < roi->height - self->radius_y)
+ gegl_buffer_get (input,
+ GEGL_RECTANGLE (roi->x, roi->y + y + self->radius_y,
+ roi->width, 1),
+ 1.0, input_format, buf[self->radius_y],
+ GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+ else if (self->edge_lock)
+ memcpy (buf[self->radius_y], buf[self->radius_y - 1],
+ roi->width * sizeof (gfloat));
+ else
+ memset (buf[self->radius_y], 0, roi->width * sizeof (gfloat));
+
+ for (x = 0 ; x < roi->width; x++) /* update max array */
+ {
+ for (i = self->radius_y; 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 < roi->width; x++) /* render scan line */
+ {
+ last_index--;
+
+ if (last_index >= 0)
+ {
+ if (last_max <= 0.0)
+ {
+ out[x] = 0.0;
+ }
+ else
+ {
+ last_max = 1.0;
+
+ for (i = self->radius_x; 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 = self->radius_x;
+ last_max = max[x + self->radius_x][circ[self->radius_x]];
+
+ for (i = self->radius_x - 1; i >= -self->radius_x; i--)
+ if (last_max > max[x + i][circ[i]])
+ {
+ last_max = max[x + i][circ[i]];
+ last_index = i;
+ }
+
+ out[x] = last_max;
+ }
+ }
+
+ gegl_buffer_set (output,
+ GEGL_RECTANGLE (roi->x, roi->y + y,
+ roi->width, 1),
+ 0, output_format, out,
+ GEGL_AUTO_ROWSTRIDE);
+ }
+
+ /* undo the offsets to the pointers so we can free the malloced memory */
+ circ -= self->radius_x;
+ max -= self->radius_x;
+
+ /* free the memory */
+ g_free (circ);
+ g_free (buffer);
+ g_free (max);
+
+ for (i = 0; i < self->radius_y + 1; i++)
+ g_free (buf[i]);
+
+ g_free (buf);
+ g_free (out);
+
+ return TRUE;
+}
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