Adding upstream version 2.10.22.upstream/2.10.22upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 596 insertions, 0 deletions

diff --git a/app/widgets/gimpdial.c b/app/widgets/gimpdial.c
new file mode 100644
index 0000000..bda1236
--- /dev/null
+++ b/app/widgets/gimpdial.c
@@ -0,0 +1,596 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpdial.c
+ * Copyright (C) 2014 Michael Natterer <mitch@gimp.org>
+ *
+ * Based on code from the color-rotate plug-in
+ * Copyright (C) 1997-1999 Sven Anders (anderss@fmi.uni-passau.de)
+ *                         Based on code from Pavel Grinfeld (pavel@ml.com)
+ *
+ * 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 <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "widgets-types.h"
+
+#include "core/gimp-cairo.h"
+
+#include "gimpdial.h"
+
+
+#define SEGMENT_FRACTION 0.3
+
+
+enum
+{
+  PROP_0,
+  PROP_DRAW_BETA,
+  PROP_ALPHA,
+  PROP_BETA,
+  PROP_CLOCKWISE_ANGLES,
+  PROP_CLOCKWISE_DELTA
+};
+
+typedef enum
+{
+  DIAL_TARGET_NONE  = 0,
+  DIAL_TARGET_ALPHA = 1 << 0,
+  DIAL_TARGET_BETA  = 1 << 1,
+  DIAL_TARGET_BOTH  = DIAL_TARGET_ALPHA | DIAL_TARGET_BETA
+} DialTarget;
+
+
+struct _GimpDialPrivate
+{
+  gdouble     alpha;
+  gdouble     beta;
+  gboolean    clockwise_angles;
+  gboolean    clockwise_delta;
+  gboolean    draw_beta;
+
+  DialTarget  target;
+  gdouble     last_angle;
+};
+
+
+static void        gimp_dial_set_property         (GObject            *object,
+                                                   guint               property_id,
+                                                   const GValue       *value,
+                                                   GParamSpec         *pspec);
+static void        gimp_dial_get_property         (GObject            *object,
+                                                   guint               property_id,
+                                                   GValue             *value,
+                                                   GParamSpec         *pspec);
+
+static gboolean    gimp_dial_expose_event         (GtkWidget          *widget,
+                                                   GdkEventExpose     *event);
+static gboolean    gimp_dial_button_press_event   (GtkWidget          *widget,
+                                                   GdkEventButton     *bevent);
+static gboolean    gimp_dial_motion_notify_event  (GtkWidget          *widget,
+                                                   GdkEventMotion     *mevent);
+
+static void        gimp_dial_reset_target         (GimpCircle         *circle);
+
+static void        gimp_dial_set_target           (GimpDial           *dial,
+                                                   DialTarget          target);
+
+static void        gimp_dial_draw_arrows          (cairo_t            *cr,
+                                                   gint                size,
+                                                   gdouble             alpha,
+                                                   gdouble             beta,
+                                                   gboolean            clockwise_delta,
+                                                   DialTarget          highlight,
+                                                   gboolean            draw_beta);
+
+static gdouble     gimp_dial_normalize_angle      (gdouble             angle);
+static gdouble     gimp_dial_get_angle_distance   (gdouble             alpha,
+                                                   gdouble             beta);
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (GimpDial, gimp_dial, GIMP_TYPE_CIRCLE)
+
+#define parent_class gimp_dial_parent_class
+
+
+static void
+gimp_dial_class_init (GimpDialClass *klass)
+{
+  GObjectClass    *object_class = G_OBJECT_CLASS (klass);
+  GtkWidgetClass  *widget_class = GTK_WIDGET_CLASS (klass);
+  GimpCircleClass *circle_class = GIMP_CIRCLE_CLASS (klass);
+
+  object_class->get_property         = gimp_dial_get_property;
+  object_class->set_property         = gimp_dial_set_property;
+
+  widget_class->expose_event         = gimp_dial_expose_event;
+  widget_class->button_press_event   = gimp_dial_button_press_event;
+  widget_class->motion_notify_event  = gimp_dial_motion_notify_event;
+
+  circle_class->reset_target         = gimp_dial_reset_target;
+
+  g_object_class_install_property (object_class, PROP_ALPHA,
+                                   g_param_spec_double ("alpha",
+                                                        NULL, NULL,
+                                                        0.0, 2 * G_PI, 0.0,
+                                                        GIMP_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_BETA,
+                                   g_param_spec_double ("beta",
+                                                        NULL, NULL,
+                                                        0.0, 2 * G_PI, G_PI,
+                                                        GIMP_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_CLOCKWISE_ANGLES,
+                                   g_param_spec_boolean ("clockwise-angles",
+                                                         NULL, NULL,
+                                                         FALSE,
+                                                         GIMP_PARAM_READWRITE |
+                                                         G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_CLOCKWISE_DELTA,
+                                   g_param_spec_boolean ("clockwise-delta",
+                                                         NULL, NULL,
+                                                         FALSE,
+                                                         GIMP_PARAM_READWRITE |
+                                                         G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_DRAW_BETA,
+                                   g_param_spec_boolean ("draw-beta",
+                                                         NULL, NULL,
+                                                         TRUE,
+                                                         GIMP_PARAM_READWRITE |
+                                                         G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_dial_init (GimpDial *dial)
+{
+  dial->priv = gimp_dial_get_instance_private (dial);
+}
+
+static void
+gimp_dial_set_property (GObject      *object,
+                        guint         property_id,
+                        const GValue *value,
+                        GParamSpec   *pspec)
+{
+  GimpDial *dial = GIMP_DIAL (object);
+
+  switch (property_id)
+    {
+    case PROP_ALPHA:
+      dial->priv->alpha = g_value_get_double (value);
+      gtk_widget_queue_draw (GTK_WIDGET (dial));
+      break;
+
+    case PROP_BETA:
+      dial->priv->beta = g_value_get_double (value);
+      gtk_widget_queue_draw (GTK_WIDGET (dial));
+      break;
+
+    case PROP_CLOCKWISE_ANGLES:
+      dial->priv->clockwise_angles = g_value_get_boolean (value);
+      gtk_widget_queue_draw (GTK_WIDGET (dial));
+      break;
+
+    case PROP_CLOCKWISE_DELTA:
+      dial->priv->clockwise_delta = g_value_get_boolean (value);
+      gtk_widget_queue_draw (GTK_WIDGET (dial));
+      break;
+
+    case PROP_DRAW_BETA:
+      dial->priv->draw_beta = g_value_get_boolean (value);
+      gtk_widget_queue_draw (GTK_WIDGET (dial));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_dial_get_property (GObject    *object,
+                        guint       property_id,
+                        GValue     *value,
+                        GParamSpec *pspec)
+{
+  GimpDial *dial = GIMP_DIAL (object);
+
+  switch (property_id)
+    {
+    case PROP_ALPHA:
+      g_value_set_double (value, dial->priv->alpha);
+      break;
+
+    case PROP_BETA:
+      g_value_set_double (value, dial->priv->beta);
+      break;
+
+    case PROP_CLOCKWISE_ANGLES:
+      g_value_set_boolean (value, dial->priv->clockwise_angles);
+      break;
+
+    case PROP_CLOCKWISE_DELTA:
+      g_value_set_boolean (value, dial->priv->clockwise_delta);
+      break;
+
+    case PROP_DRAW_BETA:
+      g_value_set_boolean (value, dial->priv->draw_beta);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static gboolean
+gimp_dial_expose_event (GtkWidget      *widget,
+                        GdkEventExpose *event)
+{
+  GimpDial *dial = GIMP_DIAL (widget);
+
+  GTK_WIDGET_CLASS (parent_class)->expose_event (widget, event);
+
+  if (gtk_widget_is_drawable (widget))
+    {
+      GtkAllocation  allocation;
+      gint           size;
+      cairo_t       *cr;
+      gdouble        alpha = dial->priv->alpha;
+      gdouble        beta  = dial->priv->beta;
+
+      g_object_get (widget,
+                    "size", &size,
+                    NULL);
+
+      cr = gdk_cairo_create (event->window);
+      gdk_cairo_region (cr, event->region);
+      cairo_clip (cr);
+
+      gtk_widget_get_allocation (widget, &allocation);
+
+      cairo_translate (cr,
+                       (gdouble) allocation.x + (allocation.width  - size) / 2.0,
+                       (gdouble) allocation.y + (allocation.height - size) / 2.0);
+
+      if (dial->priv->clockwise_angles)
+        {
+          alpha = -alpha;
+          beta  = -beta;
+        }
+
+      gimp_dial_draw_arrows (cr, size,
+                             alpha, beta,
+                             dial->priv->clockwise_delta,
+                             dial->priv->target,
+                             dial->priv->draw_beta);
+
+      cairo_destroy (cr);
+    }
+
+  return FALSE;
+}
+
+static gboolean
+gimp_dial_button_press_event (GtkWidget      *widget,
+                              GdkEventButton *bevent)
+{
+  GimpDial *dial = GIMP_DIAL (widget);
+
+  if (bevent->type == GDK_BUTTON_PRESS &&
+      bevent->button == 1              &&
+      dial->priv->target != DIAL_TARGET_NONE)
+    {
+      gdouble angle;
+
+      GTK_WIDGET_CLASS (parent_class)->button_press_event (widget, bevent);
+
+      angle = _gimp_circle_get_angle_and_distance (GIMP_CIRCLE (dial),
+                                                   bevent->x, bevent->y,
+                                                   NULL);
+
+      if (dial->priv->clockwise_angles && angle)
+        angle = 2.0 * G_PI - angle;
+
+      dial->priv->last_angle = angle;
+
+      switch (dial->priv->target)
+        {
+        case DIAL_TARGET_ALPHA:
+          g_object_set (dial, "alpha", angle, NULL);
+          break;
+
+        case DIAL_TARGET_BETA:
+          g_object_set (dial, "beta", angle, NULL);
+          break;
+
+        default:
+          break;
+        }
+    }
+
+  return FALSE;
+}
+
+static gboolean
+gimp_dial_motion_notify_event (GtkWidget      *widget,
+                               GdkEventMotion *mevent)
+{
+  GimpDial *dial = GIMP_DIAL (widget);
+  gdouble   angle;
+  gdouble   distance;
+
+  angle = _gimp_circle_get_angle_and_distance (GIMP_CIRCLE (dial),
+                                               mevent->x, mevent->y,
+                                               &distance);
+
+  if (dial->priv->clockwise_angles && angle)
+    angle = 2.0 * G_PI - angle;
+
+  if (_gimp_circle_has_grab (GIMP_CIRCLE (dial)))
+    {
+      gdouble delta;
+
+      delta = angle - dial->priv->last_angle;
+      dial->priv->last_angle = angle;
+
+      if (delta != 0.0)
+        {
+          switch (dial->priv->target)
+            {
+            case DIAL_TARGET_ALPHA:
+              g_object_set (dial, "alpha", angle, NULL);
+              break;
+
+            case DIAL_TARGET_BETA:
+              g_object_set (dial, "beta", angle, NULL);
+              break;
+
+            case DIAL_TARGET_BOTH:
+              g_object_set (dial,
+                            "alpha", gimp_dial_normalize_angle (dial->priv->alpha + delta),
+                            "beta",  gimp_dial_normalize_angle (dial->priv->beta  + delta),
+                            NULL);
+              break;
+
+            default:
+              break;
+            }
+        }
+    }
+  else
+    {
+      DialTarget target;
+      gdouble    dist_alpha;
+      gdouble    dist_beta;
+
+      dist_alpha = gimp_dial_get_angle_distance (dial->priv->alpha, angle);
+      dist_beta  = gimp_dial_get_angle_distance (dial->priv->beta, angle);
+
+      if (dial->priv->draw_beta       &&
+          distance > SEGMENT_FRACTION &&
+          MIN (dist_alpha, dist_beta) < G_PI / 12)
+        {
+          if (dist_alpha < dist_beta)
+            {
+              target = DIAL_TARGET_ALPHA;
+            }
+          else
+            {
+              target = DIAL_TARGET_BETA;
+            }
+        }
+      else
+        {
+          target = DIAL_TARGET_BOTH;
+        }
+
+      gimp_dial_set_target (dial, target);
+    }
+
+  gdk_event_request_motions (mevent);
+
+  return FALSE;
+}
+
+static void
+gimp_dial_reset_target (GimpCircle *circle)
+{
+  gimp_dial_set_target (GIMP_DIAL (circle), DIAL_TARGET_NONE);
+}
+
+
+/*  public functions  */
+
+GtkWidget *
+gimp_dial_new (void)
+{
+  return g_object_new (GIMP_TYPE_DIAL, NULL);
+}
+
+
+/*  private functions  */
+
+static void
+gimp_dial_set_target (GimpDial   *dial,
+                      DialTarget  target)
+{
+  if (target != dial->priv->target)
+    {
+      dial->priv->target = target;
+      gtk_widget_queue_draw (GTK_WIDGET (dial));
+    }
+}
+
+static void
+gimp_dial_draw_arrow (cairo_t *cr,
+                      gdouble  radius,
+                      gdouble  angle)
+{
+#define REL 0.8
+#define DEL 0.1
+
+  cairo_move_to (cr, radius, radius);
+  cairo_line_to (cr,
+                 radius + radius * cos (angle),
+                 radius - radius * sin (angle));
+
+  cairo_move_to (cr,
+                 radius + radius * cos (angle),
+                 radius - radius * sin (angle));
+  cairo_line_to (cr,
+                 radius + radius * REL * cos (angle - DEL),
+                 radius - radius * REL * sin (angle - DEL));
+
+  cairo_move_to (cr,
+                 radius + radius * cos (angle),
+                 radius - radius * sin (angle));
+  cairo_line_to (cr,
+                 radius + radius * REL * cos (angle + DEL),
+                 radius - radius * REL * sin (angle + DEL));
+}
+
+static void
+gimp_dial_draw_segment (cairo_t  *cr,
+                        gdouble   radius,
+                        gdouble   alpha,
+                        gdouble   beta,
+                        gboolean  clockwise_delta)
+{
+  gint    direction = clockwise_delta ? -1 : 1;
+  gint    segment_dist;
+  gint    tick;
+  gdouble slice;
+
+  segment_dist = radius * SEGMENT_FRACTION;
+  tick         = MIN (10, segment_dist);
+
+  cairo_move_to (cr,
+                 radius + segment_dist * cos (beta),
+                 radius - segment_dist * sin (beta));
+  cairo_line_to (cr,
+                 radius + segment_dist * cos (beta) +
+                 direction * tick * sin (beta),
+                 radius - segment_dist * sin (beta) +
+                 direction * tick * cos (beta));
+
+  cairo_new_sub_path (cr);
+
+  if (clockwise_delta)
+    slice = -gimp_dial_normalize_angle (alpha - beta);
+  else
+    slice = gimp_dial_normalize_angle (beta - alpha);
+
+  gimp_cairo_arc (cr, radius, radius, segment_dist,
+                  alpha, slice);
+}
+
+static void
+gimp_dial_draw_arrows (cairo_t    *cr,
+                       gint        size,
+                       gdouble     alpha,
+                       gdouble     beta,
+                       gboolean    clockwise_delta,
+                       DialTarget  highlight,
+                       gboolean    draw_beta)
+{
+  gdouble radius = size / 2.0 - 2.0; /* half the broad line with and half a px */
+
+  cairo_save (cr);
+
+  cairo_translate (cr, 2.0, 2.0); /* half the broad line width and half a px*/
+
+  cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
+  cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
+
+  if (highlight != DIAL_TARGET_BOTH)
+    {
+      if (! (highlight & DIAL_TARGET_ALPHA))
+        gimp_dial_draw_arrow (cr, radius, alpha);
+
+      if (draw_beta)
+        {
+          if (! (highlight & DIAL_TARGET_BETA))
+            gimp_dial_draw_arrow (cr, radius, beta);
+
+          if ((highlight & DIAL_TARGET_BOTH) != DIAL_TARGET_BOTH)
+            gimp_dial_draw_segment (cr, radius, alpha, beta, clockwise_delta);
+        }
+
+      cairo_set_line_width (cr, 3.0);
+      cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.6);
+      cairo_stroke_preserve (cr);
+
+      cairo_set_line_width (cr, 1.0);
+      cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.8);
+      cairo_stroke (cr);
+    }
+
+  if (highlight != DIAL_TARGET_NONE)
+    {
+      if (highlight & DIAL_TARGET_ALPHA)
+        gimp_dial_draw_arrow (cr, radius, alpha);
+
+      if (draw_beta)
+        {
+          if (highlight & DIAL_TARGET_BETA)
+            gimp_dial_draw_arrow (cr, radius, beta);
+
+          if ((highlight & DIAL_TARGET_BOTH) == DIAL_TARGET_BOTH)
+            gimp_dial_draw_segment (cr, radius, alpha, beta, clockwise_delta);
+        }
+
+      cairo_set_line_width (cr, 3.0);
+      cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.6);
+      cairo_stroke_preserve (cr);
+
+      cairo_set_line_width (cr, 1.0);
+      cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.8);
+      cairo_stroke (cr);
+    }
+
+  cairo_restore (cr);
+}
+
+static gdouble
+gimp_dial_normalize_angle (gdouble angle)
+{
+  if (angle < 0)
+    return angle + 2 * G_PI;
+  else if (angle > 2 * G_PI)
+    return angle - 2 * G_PI;
+  else
+    return angle;
+}
+
+static gdouble
+gimp_dial_get_angle_distance (gdouble alpha,
+                              gdouble beta)
+{
+  return ABS (MIN (gimp_dial_normalize_angle (alpha - beta),
+                   2 * G_PI - gimp_dial_normalize_angle (alpha - beta)));
+}