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-rw-r--r--app/tools/gimptilehandleriscissors.c331
1 files changed, 331 insertions, 0 deletions
diff --git a/app/tools/gimptilehandleriscissors.c b/app/tools/gimptilehandleriscissors.c
new file mode 100644
index 0000000..63e434a
--- /dev/null
+++ b/app/tools/gimptilehandleriscissors.c
@@ -0,0 +1,331 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * 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 <stdlib.h>
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+
+#include "tools-types.h"
+
+#include "gegl/gimp-gegl-loops.h"
+
+#include "core/gimppickable.h"
+
+#include "gimptilehandleriscissors.h"
+
+
+enum
+{
+ PROP_0,
+ PROP_PICKABLE
+};
+
+
+static void gimp_tile_handler_iscissors_finalize (GObject *object);
+static void gimp_tile_handler_iscissors_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_tile_handler_iscissors_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+
+static void gimp_tile_handler_iscissors_validate (GimpTileHandlerValidate *validate,
+ const GeglRectangle *rect,
+ const Babl *format,
+ gpointer dest_buf,
+ gint dest_stride);
+
+
+G_DEFINE_TYPE (GimpTileHandlerIscissors, gimp_tile_handler_iscissors,
+ GIMP_TYPE_TILE_HANDLER_VALIDATE)
+
+#define parent_class gimp_tile_handler_iscissors_parent_class
+
+
+static void
+gimp_tile_handler_iscissors_class_init (GimpTileHandlerIscissorsClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GimpTileHandlerValidateClass *validate_class;
+
+ validate_class = GIMP_TILE_HANDLER_VALIDATE_CLASS (klass);
+
+ object_class->finalize = gimp_tile_handler_iscissors_finalize;
+ object_class->set_property = gimp_tile_handler_iscissors_set_property;
+ object_class->get_property = gimp_tile_handler_iscissors_get_property;
+
+ validate_class->validate = gimp_tile_handler_iscissors_validate;
+
+ g_object_class_install_property (object_class, PROP_PICKABLE,
+ g_param_spec_object ("pickable", NULL, NULL,
+ GIMP_TYPE_PICKABLE,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT_ONLY));
+}
+
+static void
+gimp_tile_handler_iscissors_init (GimpTileHandlerIscissors *iscissors)
+{
+}
+
+static void
+gimp_tile_handler_iscissors_finalize (GObject *object)
+{
+ GimpTileHandlerIscissors *iscissors = GIMP_TILE_HANDLER_ISCISSORS (object);
+
+ if (iscissors->pickable)
+ {
+ g_object_unref (iscissors->pickable);
+ iscissors->pickable = NULL;
+ }
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_tile_handler_iscissors_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpTileHandlerIscissors *iscissors = GIMP_TILE_HANDLER_ISCISSORS (object);
+
+ switch (property_id)
+ {
+ case PROP_PICKABLE:
+ iscissors->pickable = g_value_dup_object (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_tile_handler_iscissors_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpTileHandlerIscissors *iscissors = GIMP_TILE_HANDLER_ISCISSORS (object);
+
+ switch (property_id)
+ {
+ case PROP_PICKABLE:
+ g_value_set_object (value, iscissors->pickable);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static const gfloat horz_deriv[9] =
+{
+ 1, 0, -1,
+ 2, 0, -2,
+ 1, 0, -1,
+};
+
+static const gfloat vert_deriv[9] =
+{
+ 1, 2, 1,
+ 0, 0, 0,
+ -1, -2, -1,
+};
+
+static const gfloat blur_32[9] =
+{
+ 1, 1, 1,
+ 1, 24, 1,
+ 1, 1, 1,
+};
+
+#define MAX_GRADIENT 179.606 /* == sqrt (127^2 + 127^2) */
+#define MIN_GRADIENT 63 /* gradients < this are directionless */
+#define COST_WIDTH 2 /* number of bytes for each pixel in cost map */
+
+static void
+gimp_tile_handler_iscissors_validate (GimpTileHandlerValidate *validate,
+ const GeglRectangle *rect,
+ const Babl *format,
+ gpointer dest_buf,
+ gint dest_stride)
+{
+ GimpTileHandlerIscissors *iscissors = GIMP_TILE_HANDLER_ISCISSORS (validate);
+ GeglBuffer *src;
+ GeglBuffer *temp0;
+ GeglBuffer *temp1;
+ GeglBuffer *temp2;
+ gint stride1;
+ gint stride2;
+ gint i, j;
+
+ /* temporary convolution buffers -- */
+ guchar *maxgrad_conv1;
+ guchar *maxgrad_conv2;
+
+#if 0
+ g_printerr ("validating at %d %d %d %d\n",
+ rect->x,
+ rect->y,
+ rect->width,
+ rect->height);
+#endif
+
+ gimp_pickable_flush (iscissors->pickable);
+
+ src = gimp_pickable_get_buffer (iscissors->pickable);
+
+ temp0 = gegl_buffer_new (GEGL_RECTANGLE (0, 0,
+ rect->width,
+ rect->height),
+ babl_format ("R'G'B'A u8"));
+
+ temp1 = gegl_buffer_new (GEGL_RECTANGLE (0, 0,
+ rect->width,
+ rect->height),
+ babl_format ("R'G'B'A u8"));
+
+ temp2 = gegl_buffer_new (GEGL_RECTANGLE (0, 0,
+ rect->width,
+ rect->height),
+ babl_format ("R'G'B'A u8"));
+
+ /* XXX tile edges? */
+
+ /* Blur the source to get rid of noise */
+ gimp_gegl_convolve (src, rect,
+ temp0, GEGL_RECTANGLE (0, 0, rect->width, rect->height),
+ blur_32, 3, 32, GIMP_NORMAL_CONVOL, FALSE);
+
+ /* Use this blurred region as the new source */
+
+ /* Get the horizontal derivative */
+ gimp_gegl_convolve (temp0, GEGL_RECTANGLE (0, 0, rect->width, rect->height),
+ temp1, GEGL_RECTANGLE (0, 0, rect->width, rect->height),
+ horz_deriv, 3, 1, GIMP_NEGATIVE_CONVOL, FALSE);
+
+ /* Get the vertical derivative */
+ gimp_gegl_convolve (temp0, GEGL_RECTANGLE (0, 0, rect->width, rect->height),
+ temp2, GEGL_RECTANGLE (0, 0, rect->width, rect->height),
+ vert_deriv, 3, 1, GIMP_NEGATIVE_CONVOL, FALSE);
+
+ maxgrad_conv1 =
+ (guchar *) gegl_buffer_linear_open (temp1,
+ GEGL_RECTANGLE (0, 0,
+ rect->width,
+ rect->height),
+ &stride1, NULL);
+
+ maxgrad_conv2 =
+ (guchar *) gegl_buffer_linear_open (temp2,
+ GEGL_RECTANGLE (0, 0,
+ rect->width,
+ rect->height),
+ &stride2, NULL);
+
+ /* calculate overall gradient */
+
+ for (i = 0; i < rect->height; i++)
+ {
+ const guint8 *datah = maxgrad_conv1 + stride1 * i;
+ const guint8 *datav = maxgrad_conv2 + stride2 * i;
+ guint8 *gradmap = (guint8 *) dest_buf + dest_stride * i;
+
+ for (j = 0; j < rect->width; j++)
+ {
+ gint8 hmax = datah[0] - 128;
+ gint8 vmax = datav[0] - 128;
+ gfloat gradient;
+ gint b;
+
+ for (b = 1; b < 4; b++)
+ {
+ if (abs (datah[b] - 128) > abs (hmax))
+ hmax = datah[b] - 128;
+
+ if (abs (datav[b] - 128) > abs (vmax))
+ vmax = datav[b] - 128;
+ }
+
+ if (i == 0 || j == 0 || i == rect->height - 1 || j == rect->width - 1)
+ {
+ gradmap[j * COST_WIDTH + 0] = 0;
+ gradmap[j * COST_WIDTH + 1] = 255;
+ goto contin;
+ }
+
+ /* 1 byte absolute magnitude first */
+ gradient = sqrt (SQR (hmax) + SQR (vmax));
+ gradmap[j * COST_WIDTH] = gradient * 255 / MAX_GRADIENT;
+
+ /* then 1 byte direction */
+ if (gradient > MIN_GRADIENT)
+ {
+ gfloat direction;
+
+ if (! hmax)
+ direction = (vmax > 0) ? G_PI_2 : -G_PI_2;
+ else
+ direction = atan ((gdouble) vmax / (gdouble) hmax);
+
+ /* Scale the direction from between 0 and 254,
+ * corresponding to -PI/2, PI/2 255 is reserved for
+ * directionless pixels
+ */
+ gradmap[j * COST_WIDTH + 1] =
+ (guint8) (254 * (direction + G_PI_2) / G_PI);
+ }
+ else
+ {
+ gradmap[j * COST_WIDTH + 1] = 255; /* reserved for weak gradient */
+ }
+
+ contin:
+ datah += 4;
+ datav += 4;
+ }
+ }
+
+ gegl_buffer_linear_close (temp1, maxgrad_conv1);
+ gegl_buffer_linear_close (temp2, maxgrad_conv2);
+
+ g_object_unref (temp0);
+ g_object_unref (temp1);
+ g_object_unref (temp2);
+}
+
+GeglTileHandler *
+gimp_tile_handler_iscissors_new (GimpPickable *pickable)
+{
+ g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), NULL);
+
+ return g_object_new (GIMP_TYPE_TILE_HANDLER_ISCISSORS,
+ "whole-tile", TRUE,
+ "pickable", pickable,
+ NULL);
+}
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