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[gimp/multi-stroke: 2/2] app: add a tiling multi-stroke.

commit b2b7739ac502c489d3847895f3b6219fee0c01ea
Author: Jehan <jehan girinstud io>
Date:   Sun Mar 15 17:21:02 2015 +0100

    app: add a tiling multi-stroke.

 app/paint/Makefile.am            |    4 +-
 app/paint/gimpmultistroke-info.c |    2 +
 app/paint/gimptiling.c           |  409 ++++++++++++++++++++++++++++++++++++++
 app/paint/gimptiling.h           |   57 ++++++
 app/paint/paint-types.h          |    1 +
 5 files changed, 472 insertions(+), 1 deletions(-)
---
diff --git a/app/paint/Makefile.am b/app/paint/Makefile.am
index 0d6a154..7c502c7 100644
--- a/app/paint/Makefile.am
+++ b/app/paint/Makefile.am
@@ -84,7 +84,9 @@ libapppaint_a_sources = \
        gimpsourcecore.c                \
        gimpsourcecore.h                \
        gimpsourceoptions.c             \
-       gimpsourceoptions.h
+       gimpsourceoptions.h             \
+       gimptiling.c                    \
+       gimptiling.h
 
 libapppaint_a_built_sources = paint-enums.c
 
diff --git a/app/paint/gimpmultistroke-info.c b/app/paint/gimpmultistroke-info.c
index 6ca4876..5d7b56e 100644
--- a/app/paint/gimpmultistroke-info.c
+++ b/app/paint/gimpmultistroke-info.c
@@ -28,6 +28,7 @@
 #include "gimpmirror.h"
 #include "gimpmultistroke.h"
 #include "gimpmultistroke-info.h"
+#include "gimptiling.h"
 
 GList *
 gimp_multi_stroke_list (void)
@@ -35,6 +36,7 @@ gimp_multi_stroke_list (void)
   GList *list = NULL;
 
   list = g_list_prepend (list, GINT_TO_POINTER (GIMP_TYPE_MIRROR));
+  list = g_list_prepend (list, GINT_TO_POINTER (GIMP_TYPE_TILING));
   return list;
 }
 
diff --git a/app/paint/gimptiling.c b/app/paint/gimptiling.c
new file mode 100644
index 0000000..f71aa93
--- /dev/null
+++ b/app/paint/gimptiling.c
@@ -0,0 +1,409 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimptiling.c
+ * Copyright (C) 2015 Jehan <jehan 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpconfig/gimpconfig.h"
+
+#include "paint-types.h"
+
+#include "core/gimp.h"
+#include "core/gimpdrawable.h"
+#include "core/gimpimage.h"
+#include "core/gimpitem.h"
+
+#include "gimptiling.h"
+
+#include "gimp-intl.h"
+
+/* Using same epsilon as in GLIB. */
+#define G_DOUBLE_EPSILON        (1e-90)
+
+enum
+{
+  PROP_0,
+
+  PROP_X_INTERVAL,
+  PROP_Y_INTERVAL,
+  PROP_SHIFT,
+  PROP_X_MAX,
+  PROP_Y_MAX
+};
+
+/* Local function prototypes */
+
+static void       gimp_tiling_constructed        (GObject         *object);
+static void       gimp_tiling_finalize           (GObject         *object);
+static void       gimp_tiling_set_property       (GObject         *object,
+                                                  guint            property_id,
+                                                  const GValue    *value,
+                                                  GParamSpec      *pspec);
+static void       gimp_tiling_get_property       (GObject         *object,
+                                                  guint            property_id,
+                                                  GValue          *value,
+                                                  GParamSpec      *pspec);
+
+static void       gimp_tiling_update_strokes     (GimpMultiStroke *tiling,
+                                                  GimpDrawable    *drawable,
+                                                  GimpCoords      *origin);
+static GeglNode * gimp_tiling_get_operation      (GimpMultiStroke *tiling,
+                                                  GimpPaintCore   *core,
+                                                  GeglBuffer      *paint_buffer,
+                                                  gint             stroke);
+static GParamSpec ** gimp_tiling_get_settings    (GimpMultiStroke *mstroke,
+                                                  guint           *nsettings);
+static void
+               gimp_tiling_image_size_changed_cb (GimpImage       *image ,
+                                                  gint             previous_origin_x,
+                                                  gint             previous_origin_y,
+                                                  gint             previous_width,
+                                                  gint             previous_height,
+                                                  GimpMultiStroke *mstroke);
+
+G_DEFINE_TYPE (GimpTiling, gimp_tiling, GIMP_TYPE_MULTI_STROKE)
+
+#define parent_class gimp_tiling_parent_class
+
+static void
+gimp_tiling_class_init (GimpTilingClass *klass)
+{
+  GObjectClass         *object_class       = G_OBJECT_CLASS (klass);
+  GimpMultiStrokeClass *multi_stroke_class = GIMP_MULTI_STROKE_CLASS (klass);
+
+  object_class->constructed            = gimp_tiling_constructed;
+  object_class->finalize               = gimp_tiling_finalize;
+  object_class->set_property           = gimp_tiling_set_property;
+  object_class->get_property           = gimp_tiling_get_property;
+
+  multi_stroke_class->label            = "Tiling";
+  multi_stroke_class->update_strokes   = gimp_tiling_update_strokes;
+  multi_stroke_class->get_operation    = gimp_tiling_get_operation;
+  multi_stroke_class->get_settings     = gimp_tiling_get_settings;
+  multi_stroke_class->get_xcf_settings = gimp_tiling_get_settings;
+
+  GIMP_CONFIG_INSTALL_PROP_DOUBLE (object_class, PROP_X_INTERVAL,
+                                   "x-interval", _("Intervals on x-axis (pixels)"),
+                                   0.0, 10000.0, 0.0,
+                                   GIMP_PARAM_STATIC_STRINGS);
+  GIMP_CONFIG_INSTALL_PROP_DOUBLE (object_class, PROP_Y_INTERVAL,
+                                   "y-interval", _("Intervals on y-axis (pixels)"),
+                                   0.0, 10000.0, 0.0,
+                                   GIMP_PARAM_STATIC_STRINGS);
+  GIMP_CONFIG_INSTALL_PROP_DOUBLE (object_class, PROP_SHIFT,
+                                   "shift", _("X-shift between lines (pixels)"),
+                                   0.0, 10000.0, 0.0,
+                                   GIMP_PARAM_STATIC_STRINGS);
+  GIMP_CONFIG_INSTALL_PROP_UINT (object_class, PROP_X_MAX,
+                                 "x-max", _("Max strokes on x-axis"),
+                                 0, 100, 0,
+                                 GIMP_PARAM_STATIC_STRINGS);
+  GIMP_CONFIG_INSTALL_PROP_UINT (object_class, PROP_Y_MAX,
+                                 "y-max", _("Max strokes on y-axis"),
+                                 0, 100, 0,
+                                 GIMP_PARAM_STATIC_STRINGS);
+}
+
+static void
+gimp_tiling_init (GimpTiling *tiling)
+{
+  tiling->interval_x = 0.0;
+  tiling->interval_y = 0.0;
+  tiling->shift      = 0.0;
+}
+
+static void
+gimp_tiling_constructed (GObject *object)
+{
+  GimpMultiStroke  *mstroke;
+  GParamSpecDouble *dspec;
+
+  mstroke = GIMP_MULTI_STROKE (object);
+
+  // TODO: can I have it in property and still save it in parent? Test.
+  // Also connect on image changing size.
+  // Connect to either GimpImage::size-changed-detailed
+  // or GimpViewable::size-changed
+  // see gimp_image_real_size_changed_detailed
+  /* Update property values to actual image size. */
+  dspec = G_PARAM_SPEC_DOUBLE (g_object_class_find_property (G_OBJECT_GET_CLASS (object),
+                                                             "x-interval"));
+  dspec->maximum = gimp_image_get_width (mstroke->image);
+
+  dspec = G_PARAM_SPEC_DOUBLE (g_object_class_find_property (G_OBJECT_GET_CLASS (object),
+                                                             "shift"));
+  dspec->maximum = gimp_image_get_width (mstroke->image);
+
+  dspec = G_PARAM_SPEC_DOUBLE (g_object_class_find_property (G_OBJECT_GET_CLASS (object),
+                                                             "y-interval"));
+  dspec->maximum = gimp_image_get_height (mstroke->image);
+
+  g_signal_connect (mstroke->image, "size-changed-detailed",
+                    G_CALLBACK (gimp_tiling_image_size_changed_cb),
+                    mstroke);
+}
+
+static void
+gimp_tiling_finalize (GObject *object)
+{
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_tiling_set_property (GObject      *object,
+                          guint         property_id,
+                          const GValue *value,
+                          GParamSpec   *pspec)
+{
+  GimpTiling      *tiling = GIMP_TILING (object);
+  GimpMultiStroke *mstroke = GIMP_MULTI_STROKE (tiling);
+
+  switch (property_id)
+    {
+    case PROP_X_INTERVAL:
+      if (mstroke->image)
+        {
+          gdouble new_x = g_value_get_double (value);
+
+          if (new_x < gimp_image_get_width (mstroke->image))
+            {
+              tiling->interval_x = new_x;
+
+              if (tiling->interval_x <= tiling->shift + G_DOUBLE_EPSILON)
+                {
+                  GValue val = {0,};
+
+                  g_value_init (&val, G_TYPE_DOUBLE);
+                  g_value_set_double (&val, 0.0);
+                  g_object_set_property (G_OBJECT (object), "shift", &val);
+                }
+              else if (mstroke->drawable)
+                gimp_tiling_update_strokes (mstroke, mstroke->drawable, mstroke->origin);
+            }
+        }
+      break;
+    case PROP_Y_INTERVAL:
+        {
+          gdouble new_y = g_value_get_double (value);
+
+          if (new_y < gimp_image_get_height (mstroke->image))
+            {
+              tiling->interval_y = new_y;
+
+              if (tiling->interval_y <= G_DOUBLE_EPSILON)
+                {
+                  GValue val = {0,};
+
+                  g_value_init (&val, G_TYPE_DOUBLE);
+                  g_value_set_double (&val, 0.0);
+                  g_object_set_property (G_OBJECT (object), "shift", &val);
+                }
+              else if (mstroke->drawable)
+                gimp_tiling_update_strokes (mstroke, mstroke->drawable, mstroke->origin);
+            }
+        }
+      break;
+    case PROP_SHIFT:
+        {
+          gdouble new_shift = g_value_get_double (value);
+
+          if (new_shift == 0.0 ||
+              (tiling->interval_y != 0.0 && new_shift < tiling->interval_x))
+            {
+              tiling->shift = new_shift;
+              if (mstroke->drawable)
+                gimp_tiling_update_strokes (mstroke, mstroke->drawable, mstroke->origin);
+            }
+        }
+      break;
+    case PROP_X_MAX:
+      tiling->max_x = g_value_get_uint (value);
+      if (mstroke->drawable)
+        gimp_tiling_update_strokes (mstroke, mstroke->drawable, mstroke->origin);
+      break;
+    case PROP_Y_MAX:
+      tiling->max_y = g_value_get_uint (value);
+      if (mstroke->drawable)
+        gimp_tiling_update_strokes (mstroke, mstroke->drawable, mstroke->origin);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_tiling_get_property (GObject    *object,
+                          guint       property_id,
+                          GValue     *value,
+                          GParamSpec *pspec)
+{
+  GimpTiling *tiling = GIMP_TILING (object);
+
+  switch (property_id)
+    {
+    case PROP_X_INTERVAL:
+      g_value_set_double (value, tiling->interval_x);
+      break;
+    case PROP_Y_INTERVAL:
+      g_value_set_double (value, tiling->interval_y);
+      break;
+    case PROP_SHIFT:
+      g_value_set_double (value, tiling->shift);
+      break;
+    case PROP_X_MAX:
+      g_value_set_uint (value, tiling->max_x);
+      break;
+    case PROP_Y_MAX:
+      g_value_set_uint (value, tiling->max_y);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_tiling_update_strokes (GimpMultiStroke *mstroke,
+                            GimpDrawable    *drawable,
+                            GimpCoords      *origin)
+{
+  GList            *strokes = NULL;
+  GimpTiling       *tiling  = GIMP_TILING (mstroke);
+  GimpCoords       *coords;
+  gint              width;
+  gint              height;
+  gint              startx = origin->x;
+  gint              starty = origin->y;
+  gint              x;
+  gint              y;
+  gint              x_count;
+  gint              y_count;
+
+  g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
+  g_return_if_fail (GIMP_IS_MULTI_STROKE (mstroke));
+
+  g_list_free_full (mstroke->strokes, g_free);
+  mstroke->strokes = NULL;
+
+  width  = gimp_item_get_width (GIMP_ITEM (drawable));
+  height = gimp_item_get_height (GIMP_ITEM (drawable));
+
+  if (origin->x > 0 && tiling->max_x == 0)
+    startx = origin->x - tiling->interval_x * (gint) (origin->x / tiling->interval_x + 1)
+             - tiling->shift * (gint) (origin->y / tiling->interval_y + 1);
+  if (origin->y > 0 && tiling->max_y == 0)
+    starty = origin->y - tiling->interval_y * (gint) (origin->y / tiling->interval_y + 1);
+  for (y_count = 0, y = starty; y < height + tiling->interval_y;
+       y_count++, y += tiling->interval_y)
+    {
+      for (x_count = 0, x = startx; x < width + tiling->interval_x;
+           x_count++, x += tiling->interval_x)
+        {
+          coords = g_memdup (origin, sizeof (GimpCoords));
+          coords->x = x;
+          coords->y = y;
+          strokes = g_list_prepend (strokes, coords);
+          if (tiling->interval_x < 1.0 ||
+              (tiling->max_x && x_count >= (gint) tiling->max_x))
+            break;
+        }
+      if (tiling->interval_y < 1.0 ||
+          (tiling->max_y && y_count >= (gint) tiling->max_y))
+        break;
+      if (tiling->max_x || startx + tiling->shift <= 0.0)
+        startx = startx + tiling->shift;
+      else
+        startx = startx - tiling->interval_x + tiling->shift;
+    }
+  mstroke->strokes = strokes;
+
+  g_signal_emit_by_name (mstroke, "strokes-updated", mstroke->image);
+}
+
+static GeglNode *
+gimp_tiling_get_operation (GimpMultiStroke *mstroke,
+                           GimpPaintCore   *core,
+                           GeglBuffer      *paint_buffer,
+                           gint             stroke)
+{
+  /* No buffer transformation happens for tiling. */
+  return NULL;
+}
+
+static GParamSpec **
+gimp_tiling_get_settings (GimpMultiStroke *mstroke,
+                          guint           *nsettings)
+{
+  GParamSpec **pspecs;
+
+  *nsettings = 6;
+  pspecs = g_new (GParamSpec*, 6);
+
+  pspecs[0] = g_object_class_find_property (G_OBJECT_GET_CLASS (mstroke),
+                                            "x-interval");
+  pspecs[1] = g_object_class_find_property (G_OBJECT_GET_CLASS (mstroke),
+                                            "y-interval");
+  pspecs[2] = g_object_class_find_property (G_OBJECT_GET_CLASS (mstroke),
+                                            "shift");
+  pspecs[3] = NULL;
+  pspecs[4] = g_object_class_find_property (G_OBJECT_GET_CLASS (mstroke),
+                                            "x-max");
+  pspecs[5] = g_object_class_find_property (G_OBJECT_GET_CLASS (mstroke),
+                                            "y-max");
+
+  return pspecs;
+}
+
+static void
+gimp_tiling_image_size_changed_cb (GimpImage       *image,
+                                   gint             previous_origin_x,
+                                   gint             previous_origin_y,
+                                   gint             previous_width,
+                                   gint             previous_height,
+                                   GimpMultiStroke *mstroke)
+{
+  GParamSpecDouble *dspec;
+
+  if (previous_width != gimp_image_get_width (image))
+    {
+      dspec = G_PARAM_SPEC_DOUBLE (g_object_class_find_property (G_OBJECT_GET_CLASS (mstroke),
+                                                                 "x-interval"));
+      dspec->maximum = gimp_image_get_width (mstroke->image);
+
+      dspec = G_PARAM_SPEC_DOUBLE (g_object_class_find_property (G_OBJECT_GET_CLASS (mstroke),
+                                                                 "shift"));
+      dspec->maximum = gimp_image_get_width (mstroke->image);
+    }
+  if (previous_height != gimp_image_get_height (image))
+    {
+      dspec = G_PARAM_SPEC_DOUBLE (g_object_class_find_property (G_OBJECT_GET_CLASS (mstroke),
+                                                                 "y-interval"));
+      dspec->maximum = gimp_image_get_height (mstroke->image);
+    }
+
+  if (previous_width != gimp_image_get_width (image) ||
+      previous_height != gimp_image_get_height (image))
+    g_signal_emit_by_name (mstroke, "update-ui", mstroke->image);
+}
diff --git a/app/paint/gimptiling.h b/app/paint/gimptiling.h
new file mode 100644
index 0000000..7f60185
--- /dev/null
+++ b/app/paint/gimptiling.h
@@ -0,0 +1,57 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimptiling.h
+ * Copyright (C) 2015 Jehan <jehan 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 <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_TILING_H__
+#define __GIMP_TILING_H__
+
+
+#include "gimpmultistroke.h"
+
+
+#define GIMP_TYPE_TILING            (gimp_tiling_get_type ())
+#define GIMP_TILING(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_TILING, GimpTiling))
+#define GIMP_TILING_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_TILING, GimpTilingClass))
+#define GIMP_IS_TILING(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_TILING))
+#define GIMP_IS_TILING_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_TILING))
+#define GIMP_TILING_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_TILING, GimpTilingClass))
+
+typedef struct _GimpTilingClass GimpTilingClass;
+
+struct _GimpTiling
+{
+  GimpMultiStroke  parent_instance;
+
+  gdouble          interval_x;
+  gdouble          interval_y;
+  gdouble          shift;
+  guint            max_x;
+  guint            max_y;
+};
+
+struct _GimpTilingClass
+{
+  GimpMultiStrokeClass  parent_class;
+};
+
+GType        gimp_tiling_get_type                (void) G_GNUC_CONST;
+
+#endif  /*  __GIMP_TILING_H__  */
+
+
diff --git a/app/paint/paint-types.h b/app/paint/paint-types.h
index 6a0b80b..2592b30 100644
--- a/app/paint/paint-types.h
+++ b/app/paint/paint-types.h
@@ -44,6 +44,7 @@ typedef struct _GimpSmudge           GimpSmudge;
 /* Multi-stroke transformations */
 typedef struct _GimpMultiStroke      GimpMultiStroke;
 typedef struct _GimpMirror           GimpMirror;
+typedef struct _GimpTiling           GimpTiling;
 
 /*  paint options  */
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