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-rw-r--r--app/widgets/gimpcurveview.c1547
1 files changed, 1547 insertions, 0 deletions
diff --git a/app/widgets/gimpcurveview.c b/app/widgets/gimpcurveview.c
new file mode 100644
index 0000000..c34d06e
--- /dev/null
+++ b/app/widgets/gimpcurveview.c
@@ -0,0 +1,1547 @@
+/* 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 <string.h>
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+#include <gdk/gdkkeysyms.h>
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpconfig/gimpconfig.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "widgets-types.h"
+
+#include "core/gimp.h"
+#include "core/gimpcurve.h"
+#include "core/gimpcurve-map.h"
+#include "core/gimpmarshal.h"
+
+#include "gimpclipboard.h"
+#include "gimpcurveview.h"
+#include "gimpwidgets-utils.h"
+
+
+#define POINT_MAX_DISTANCE 16.0
+
+
+enum
+{
+ PROP_0,
+ PROP_GIMP,
+ PROP_BASE_LINE,
+ PROP_GRID_ROWS,
+ PROP_GRID_COLUMNS,
+ PROP_X_AXIS_LABEL,
+ PROP_Y_AXIS_LABEL
+};
+
+enum
+{
+ SELECTION_CHANGED,
+ CUT_CLIPBOARD,
+ COPY_CLIPBOARD,
+ PASTE_CLIPBOARD,
+ LAST_SIGNAL
+};
+
+
+typedef struct
+{
+ GimpCurve *curve;
+ GimpRGB color;
+ gboolean color_set;
+} BGCurve;
+
+
+static void gimp_curve_view_finalize (GObject *object);
+static void gimp_curve_view_dispose (GObject *object);
+static void gimp_curve_view_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_curve_view_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+
+static void gimp_curve_view_style_set (GtkWidget *widget,
+ GtkStyle *prev_style);
+static gboolean gimp_curve_view_expose (GtkWidget *widget,
+ GdkEventExpose *event);
+static gboolean gimp_curve_view_button_press (GtkWidget *widget,
+ GdkEventButton *bevent);
+static gboolean gimp_curve_view_button_release (GtkWidget *widget,
+ GdkEventButton *bevent);
+static gboolean gimp_curve_view_motion_notify (GtkWidget *widget,
+ GdkEventMotion *bevent);
+static gboolean gimp_curve_view_leave_notify (GtkWidget *widget,
+ GdkEventCrossing *cevent);
+static gboolean gimp_curve_view_key_press (GtkWidget *widget,
+ GdkEventKey *kevent);
+
+static void gimp_curve_view_cut_clipboard (GimpCurveView *view);
+static void gimp_curve_view_copy_clipboard (GimpCurveView *view);
+static void gimp_curve_view_paste_clipboard (GimpCurveView *view);
+
+static void gimp_curve_view_curve_dirty (GimpCurve *curve,
+ GimpCurveView *view);
+static void gimp_curve_view_curve_notify_n_points (GimpCurve *curve,
+ GParamSpec *pspec,
+ GimpCurveView *view);
+
+static void gimp_curve_view_set_cursor (GimpCurveView *view,
+ gdouble x,
+ gdouble y);
+static void gimp_curve_view_unset_cursor (GimpCurveView *view);
+
+
+G_DEFINE_TYPE (GimpCurveView, gimp_curve_view,
+ GIMP_TYPE_HISTOGRAM_VIEW)
+
+#define parent_class gimp_curve_view_parent_class
+
+static guint curve_view_signals[LAST_SIGNAL] = { 0 };
+
+
+static void
+gimp_curve_view_class_init (GimpCurveViewClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+ GtkBindingSet *binding_set;
+
+ object_class->finalize = gimp_curve_view_finalize;
+ object_class->dispose = gimp_curve_view_dispose;
+ object_class->set_property = gimp_curve_view_set_property;
+ object_class->get_property = gimp_curve_view_get_property;
+
+ widget_class->style_set = gimp_curve_view_style_set;
+ widget_class->expose_event = gimp_curve_view_expose;
+ widget_class->button_press_event = gimp_curve_view_button_press;
+ widget_class->button_release_event = gimp_curve_view_button_release;
+ widget_class->motion_notify_event = gimp_curve_view_motion_notify;
+ widget_class->leave_notify_event = gimp_curve_view_leave_notify;
+ widget_class->key_press_event = gimp_curve_view_key_press;
+
+ klass->selection_changed = NULL;
+ klass->cut_clipboard = gimp_curve_view_cut_clipboard;
+ klass->copy_clipboard = gimp_curve_view_copy_clipboard;
+ klass->paste_clipboard = gimp_curve_view_paste_clipboard;
+
+ g_object_class_install_property (object_class, PROP_GIMP,
+ g_param_spec_object ("gimp",
+ NULL, NULL,
+ GIMP_TYPE_GIMP,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_BASE_LINE,
+ g_param_spec_boolean ("base-line",
+ NULL, NULL,
+ TRUE,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT_ONLY));
+
+ g_object_class_install_property (object_class, PROP_GRID_ROWS,
+ g_param_spec_int ("grid-rows", NULL, NULL,
+ 0, 100, 8,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT_ONLY));
+
+ g_object_class_install_property (object_class, PROP_GRID_COLUMNS,
+ g_param_spec_int ("grid-columns", NULL, NULL,
+ 0, 100, 8,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT_ONLY));
+
+ g_object_class_install_property (object_class, PROP_X_AXIS_LABEL,
+ g_param_spec_string ("x-axis-label", NULL, NULL,
+ NULL,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_Y_AXIS_LABEL,
+ g_param_spec_string ("y-axis-label", NULL, NULL,
+ NULL,
+ GIMP_PARAM_READWRITE));
+
+ curve_view_signals[SELECTION_CHANGED] =
+ g_signal_new ("selection-changed",
+ G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_FIRST,
+ G_STRUCT_OFFSET (GimpCurveViewClass, selection_changed),
+ NULL, NULL,
+ gimp_marshal_VOID__VOID,
+ G_TYPE_NONE, 0);
+
+ curve_view_signals[CUT_CLIPBOARD] =
+ g_signal_new ("cut-clipboard",
+ G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
+ G_STRUCT_OFFSET (GimpCurveViewClass, cut_clipboard),
+ NULL, NULL,
+ gimp_marshal_VOID__VOID,
+ G_TYPE_NONE, 0);
+
+ curve_view_signals[COPY_CLIPBOARD] =
+ g_signal_new ("copy-clipboard",
+ G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
+ G_STRUCT_OFFSET (GimpCurveViewClass, copy_clipboard),
+ NULL, NULL,
+ gimp_marshal_VOID__VOID,
+ G_TYPE_NONE, 0);
+
+ curve_view_signals[PASTE_CLIPBOARD] =
+ g_signal_new ("paste-clipboard",
+ G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
+ G_STRUCT_OFFSET (GimpCurveViewClass, paste_clipboard),
+ NULL, NULL,
+ gimp_marshal_VOID__VOID,
+ G_TYPE_NONE, 0);
+
+ binding_set = gtk_binding_set_by_class (klass);
+
+ gtk_binding_entry_add_signal (binding_set, GDK_KEY_x, GDK_CONTROL_MASK,
+ "cut-clipboard", 0);
+ gtk_binding_entry_add_signal (binding_set, GDK_KEY_c, GDK_CONTROL_MASK,
+ "copy-clipboard", 0);
+ gtk_binding_entry_add_signal (binding_set, GDK_KEY_v, GDK_CONTROL_MASK,
+ "paste-clipboard", 0);
+}
+
+static void
+gimp_curve_view_init (GimpCurveView *view)
+{
+ view->curve = NULL;
+ view->selected = -1;
+ view->offset_x = 0.0;
+ view->offset_y = 0.0;
+ view->last_x = 0.0;
+ view->last_y = 0.0;
+ view->cursor_type = -1;
+ view->xpos = -1.0;
+ view->cursor_x = -1.0;
+ view->cursor_y = -1.0;
+ view->range_x_min = 0.0;
+ view->range_x_max = 1.0;
+ view->range_y_min = 0.0;
+ view->range_y_max = 1.0;
+
+ view->x_axis_label = NULL;
+ view->y_axis_label = NULL;
+
+ gtk_widget_set_can_focus (GTK_WIDGET (view), TRUE);
+ gtk_widget_add_events (GTK_WIDGET (view),
+ GDK_BUTTON_PRESS_MASK |
+ GDK_BUTTON_RELEASE_MASK |
+ GDK_BUTTON1_MOTION_MASK |
+ GDK_POINTER_MOTION_MASK |
+ GDK_KEY_PRESS_MASK |
+ GDK_LEAVE_NOTIFY_MASK);
+}
+
+static void
+gimp_curve_view_finalize (GObject *object)
+{
+ GimpCurveView *view = GIMP_CURVE_VIEW (object);
+
+ g_clear_object (&view->orig_curve);
+
+ g_clear_object (&view->layout);
+ g_clear_object (&view->cursor_layout);
+
+ g_clear_pointer (&view->x_axis_label, g_free);
+ g_clear_pointer (&view->y_axis_label, g_free);
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_curve_view_dispose (GObject *object)
+{
+ GimpCurveView *view = GIMP_CURVE_VIEW (object);
+
+ gimp_curve_view_set_curve (view, NULL, NULL);
+
+ if (view->bg_curves)
+ gimp_curve_view_remove_all_backgrounds (view);
+
+ G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gimp_curve_view_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpCurveView *view = GIMP_CURVE_VIEW (object);
+
+ switch (property_id)
+ {
+ case PROP_GIMP:
+ view->gimp = g_value_get_object (value); /* don't ref */
+ break;
+ case PROP_GRID_ROWS:
+ view->grid_rows = g_value_get_int (value);
+ break;
+ case PROP_GRID_COLUMNS:
+ view->grid_columns = g_value_get_int (value);
+ break;
+ case PROP_BASE_LINE:
+ view->draw_base_line = g_value_get_boolean (value);
+ break;
+ case PROP_X_AXIS_LABEL:
+ gimp_curve_view_set_x_axis_label (view, g_value_get_string (value));
+ break;
+ case PROP_Y_AXIS_LABEL:
+ gimp_curve_view_set_y_axis_label (view, g_value_get_string (value));
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_curve_view_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpCurveView *view = GIMP_CURVE_VIEW (object);
+
+ switch (property_id)
+ {
+ case PROP_GIMP:
+ g_value_set_object (value, view->gimp);
+ break;
+ case PROP_GRID_ROWS:
+ g_value_set_int (value, view->grid_rows);
+ break;
+ case PROP_GRID_COLUMNS:
+ g_value_set_int (value, view->grid_columns);
+ break;
+ case PROP_BASE_LINE:
+ g_value_set_boolean (value, view->draw_base_line);
+ break;
+ case PROP_X_AXIS_LABEL:
+ g_value_set_string (value, view->x_axis_label);
+ break;
+ case PROP_Y_AXIS_LABEL:
+ g_value_set_string (value, view->y_axis_label);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_curve_view_style_set (GtkWidget *widget,
+ GtkStyle *prev_style)
+{
+ GimpCurveView *view = GIMP_CURVE_VIEW (widget);
+
+ GTK_WIDGET_CLASS (parent_class)->style_set (widget, prev_style);
+
+ g_clear_object (&view->layout);
+ g_clear_object (&view->cursor_layout);
+}
+
+static void
+gimp_curve_view_draw_grid (GimpCurveView *view,
+ cairo_t *cr,
+ gint width,
+ gint height,
+ gint border)
+{
+ gint i;
+
+ for (i = 1; i < view->grid_rows; i++)
+ {
+ gint y = i * (height - 1) / view->grid_rows;
+
+ if ((view->grid_rows % 2) == 0 && (i == view->grid_rows / 2))
+ continue;
+
+ cairo_move_to (cr, border, border + y);
+ cairo_line_to (cr, border + width - 1, border + y);
+ }
+
+ for (i = 1; i < view->grid_columns; i++)
+ {
+ gint x = i * (width - 1) / view->grid_columns;
+
+ if ((view->grid_columns % 2) == 0 && (i == view->grid_columns / 2))
+ continue;
+
+ cairo_move_to (cr, border + x, border);
+ cairo_line_to (cr, border + x, border + height - 1);
+ }
+
+ if (view->draw_base_line)
+ {
+ cairo_move_to (cr, border, border + height - 1);
+ cairo_line_to (cr, border + width - 1, border);
+ }
+
+ cairo_set_line_width (cr, 0.6);
+ cairo_stroke (cr);
+
+ if ((view->grid_rows % 2) == 0)
+ {
+ gint y = (height - 1) / 2;
+
+ cairo_move_to (cr, border, border + y);
+ cairo_line_to (cr, border + width - 1, border + y);
+ }
+
+ if ((view->grid_columns % 2) == 0)
+ {
+ gint x = (width - 1) / 2;
+
+ cairo_move_to (cr, border + x, border);
+ cairo_line_to (cr, border + x, border + height - 1);
+ }
+
+ cairo_set_line_width (cr, 1.0);
+ cairo_stroke (cr);
+}
+
+static void
+gimp_curve_view_draw_point (GimpCurveView *view,
+ cairo_t *cr,
+ gint i,
+ gint width,
+ gint height,
+ gint border)
+{
+ gdouble x, y;
+
+ gimp_curve_get_point (view->curve, i, &x, &y);
+
+ y = 1.0 - y;
+
+#define CIRCLE_RADIUS 3
+#define DIAMOND_RADIUS (G_SQRT2 * CIRCLE_RADIUS)
+
+ switch (gimp_curve_get_point_type (view->curve, i))
+ {
+ case GIMP_CURVE_POINT_SMOOTH:
+ cairo_move_to (cr,
+ border + (gdouble) (width - 1) * x + CIRCLE_RADIUS,
+ border + (gdouble) (height - 1) * y);
+ cairo_arc (cr,
+ border + (gdouble) (width - 1) * x,
+ border + (gdouble) (height - 1) * y,
+ CIRCLE_RADIUS,
+ 0, 2 * G_PI);
+ break;
+
+ case GIMP_CURVE_POINT_CORNER:
+ cairo_move_to (cr,
+ border + (gdouble) (width - 1) * x,
+ border + (gdouble) (height - 1) * y - DIAMOND_RADIUS);
+ cairo_line_to (cr,
+ border + (gdouble) (width - 1) * x + DIAMOND_RADIUS,
+ border + (gdouble) (height - 1) * y);
+ cairo_line_to (cr,
+ border + (gdouble) (width - 1) * x,
+ border + (gdouble) (height - 1) * y + DIAMOND_RADIUS);
+ cairo_line_to (cr,
+ border + (gdouble) (width - 1) * x - DIAMOND_RADIUS,
+ border + (gdouble) (height - 1) * y);
+ cairo_close_path (cr);
+ break;
+ }
+}
+
+static void
+gimp_curve_view_draw_curve (GimpCurveView *view,
+ cairo_t *cr,
+ GimpCurve *curve,
+ gint width,
+ gint height,
+ gint border)
+{
+ gdouble x, y;
+ gint i;
+
+ x = 0.0;
+ y = 1.0 - gimp_curve_map_value (curve, 0.0);
+
+ cairo_move_to (cr,
+ border + (gdouble) (width - 1) * x,
+ border + (gdouble) (height - 1)* y);
+
+ for (i = 1; i < 256; i++)
+ {
+ x = (gdouble) i / 255.0;
+ y = 1.0 - gimp_curve_map_value (curve, x);
+
+ cairo_line_to (cr,
+ border + (gdouble) (width - 1) * x,
+ border + (gdouble) (height - 1) * y);
+ }
+
+ cairo_stroke (cr);
+}
+
+static gboolean
+gimp_curve_view_expose (GtkWidget *widget,
+ GdkEventExpose *event)
+{
+ GimpCurveView *view = GIMP_CURVE_VIEW (widget);
+ GdkWindow *window = gtk_widget_get_window (widget);
+ GtkStyle *style = gtk_widget_get_style (widget);
+ GtkAllocation allocation;
+ cairo_t *cr;
+ GList *list;
+ gint border;
+ gint width;
+ gint height;
+ gint layout_x;
+ gint layout_y;
+ gdouble x, y;
+ gint i;
+
+ GTK_WIDGET_CLASS (parent_class)->expose_event (widget, event);
+
+ if (! view->curve)
+ return FALSE;
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ border = GIMP_HISTOGRAM_VIEW (view)->border_width;
+ width = allocation.width - 2 * border;
+ height = allocation.height - 2 * border;
+
+ cr = gdk_cairo_create (gtk_widget_get_window (widget));
+
+ gdk_cairo_region (cr, event->region);
+ cairo_clip (cr);
+
+ if (gtk_widget_has_focus (widget))
+ {
+ gtk_paint_focus (style, window,
+ gtk_widget_get_state (widget),
+ &event->area, widget, NULL,
+ border - 2, border - 2,
+ width + 4, height + 4);
+ }
+
+ cairo_set_line_width (cr, 1.0);
+ cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
+ cairo_translate (cr, 0.5, 0.5);
+
+ /* Draw the grid lines */
+ gdk_cairo_set_source_color (cr, &style->text_aa[GTK_STATE_NORMAL]);
+
+ gimp_curve_view_draw_grid (view, cr, width, height, border);
+
+ /* Draw the axis labels */
+
+ if (view->x_axis_label)
+ {
+ if (! view->layout)
+ view->layout = gtk_widget_create_pango_layout (widget, NULL);
+
+ pango_layout_set_text (view->layout, view->x_axis_label, -1);
+ pango_layout_get_pixel_size (view->layout, &layout_x, &layout_y);
+
+ cairo_move_to (cr,
+ width - border - layout_x,
+ height - border - layout_y);
+
+ gdk_cairo_set_source_color (cr, &style->text[GTK_STATE_NORMAL]);
+ pango_cairo_show_layout (cr, view->layout);
+ }
+
+ if (view->y_axis_label)
+ {
+ if (! view->layout)
+ view->layout = gtk_widget_create_pango_layout (widget, NULL);
+
+ pango_layout_set_text (view->layout, view->y_axis_label, -1);
+ pango_layout_get_pixel_size (view->layout, &layout_x, &layout_y);
+
+ cairo_save (cr);
+
+ cairo_move_to (cr,
+ 2 * border,
+ 2 * border + layout_x);
+ cairo_rotate (cr, - G_PI / 2);
+
+ gdk_cairo_set_source_color (cr, &style->text[GTK_STATE_NORMAL]);
+ pango_cairo_show_layout (cr, view->layout);
+
+ cairo_restore (cr);
+ }
+
+
+ /* Draw the background curves */
+ for (list = view->bg_curves; list; list = g_list_next (list))
+ {
+ BGCurve *bg = list->data;
+
+ if (bg->color_set)
+ {
+ cairo_set_source_rgba (cr,
+ bg->color.r,
+ bg->color.g,
+ bg->color.b,
+ 0.5);
+ }
+ else
+ {
+ cairo_set_source_rgba (cr,
+ style->text[GTK_STATE_NORMAL].red / 65535.0,
+ style->text[GTK_STATE_NORMAL].green / 65535.0,
+ style->text[GTK_STATE_NORMAL].blue / 65535.0,
+ 0.5);
+ }
+
+ gimp_curve_view_draw_curve (view, cr, bg->curve,
+ width, height, border);
+ }
+
+ /* Draw the curve */
+ if (view->curve_color)
+ gimp_cairo_set_source_rgb (cr, view->curve_color);
+ else
+ gdk_cairo_set_source_color (cr, &style->text[GTK_STATE_NORMAL]);
+
+ gimp_curve_view_draw_curve (view, cr, view->curve,
+ width, height, border);
+
+ /* Draw the points */
+ if (gimp_curve_get_curve_type (view->curve) == GIMP_CURVE_SMOOTH)
+ {
+ gdk_cairo_set_source_color (cr, &style->text[GTK_STATE_NORMAL]);
+
+ /* Draw the unselected points */
+ for (i = 0; i < view->curve->n_points; i++)
+ {
+ if (i == view->selected)
+ continue;
+
+ gimp_curve_view_draw_point (view, cr, i, width, height, border);
+ }
+
+ cairo_stroke (cr);
+
+ /* Draw the selected point */
+ if (view->selected != -1)
+ {
+ gimp_curve_view_draw_point (view, cr, view->selected,
+ width, height, border);
+ cairo_fill (cr);
+ }
+ }
+
+ if (view->xpos >= 0.0)
+ {
+ gchar buf[32];
+
+ gdk_cairo_set_source_color (cr, &style->text[GTK_STATE_NORMAL]);
+
+ /* draw the color line */
+ cairo_move_to (cr,
+ border + ROUND ((gdouble) (width - 1) * view->xpos),
+ border + 1);
+ cairo_line_to (cr,
+ border + ROUND ((gdouble) (width - 1) * view->xpos),
+ border + height - 1);
+ cairo_stroke (cr);
+
+ if (view->range_x_max == 255.0)
+ {
+ /* stupid heuristic: special-case for 0..255 */
+
+ g_snprintf (buf, sizeof (buf), "x:%3d",
+ (gint) (view->xpos *
+ (view->range_x_max - view->range_x_min) +
+ view->range_x_min));
+ }
+ else if (view->range_x_max == 100.0)
+ {
+ /* and for 0..100 */
+
+ g_snprintf (buf, sizeof (buf), "x:%0.2f",
+ view->xpos *
+ (view->range_x_max - view->range_x_min) +
+ view->range_x_min);
+ }
+ else
+ {
+ g_snprintf (buf, sizeof (buf), "x:%0.3f",
+ view->xpos *
+ (view->range_x_max - view->range_x_min) +
+ view->range_x_min);
+ }
+
+ if (! view->layout)
+ view->layout = gtk_widget_create_pango_layout (widget, NULL);
+
+ pango_layout_set_text (view->layout, buf, -1);
+ pango_layout_get_pixel_size (view->layout, &layout_x, &layout_y);
+
+ if (view->xpos < 0.5)
+ layout_x = border;
+ else
+ layout_x = -(layout_x + border);
+
+ cairo_move_to (cr,
+ border + (gdouble) width * view->xpos + layout_x,
+ border + height - border - layout_y);
+ pango_cairo_show_layout (cr, view->layout);
+ }
+
+ if (view->cursor_x >= 0.0 && view->cursor_x <= 1.0 &&
+ view->cursor_y >= 0.0 && view->cursor_y <= 1.0)
+ {
+ gchar buf[32];
+ gint w, h;
+
+ if (! view->cursor_layout)
+ view->cursor_layout = gtk_widget_create_pango_layout (widget, NULL);
+
+ if (view->range_x_max == 255.0 &&
+ view->range_y_max == 255.0)
+ {
+ /* stupid heuristic: special-case for 0..255 */
+
+ g_snprintf (buf, sizeof (buf), "x:%3d y:%3d",
+ (gint) round (view->cursor_x *
+ (view->range_x_max - view->range_x_min) +
+ view->range_x_min),
+ (gint) round ((1.0 - view->cursor_y) *
+ (view->range_y_max - view->range_y_min) +
+ view->range_y_min));
+ }
+ else if (view->range_x_max == 100.0 &&
+ view->range_y_max == 100.0)
+ {
+ /* and for 0..100 */
+
+ g_snprintf (buf, sizeof (buf), "x:%0.2f y:%0.2f",
+ view->cursor_x *
+ (view->range_x_max - view->range_x_min) +
+ view->range_x_min,
+ (1.0 - view->cursor_y) *
+ (view->range_y_max - view->range_y_min) +
+ view->range_y_min);
+ }
+ else
+ {
+ g_snprintf (buf, sizeof (buf), "x:%0.3f y:%0.3f",
+ view->cursor_x *
+ (view->range_x_max - view->range_x_min) +
+ view->range_x_min,
+ (1.0 - view->cursor_y) *
+ (view->range_y_max - view->range_y_min) +
+ view->range_y_min);
+ }
+
+ pango_layout_set_text (view->cursor_layout, buf, -1);
+ pango_layout_get_pixel_extents (view->cursor_layout,
+ NULL, &view->cursor_rect);
+
+ x = border * 2 + 3;
+ y = border * 2 + 3;
+ w = view->cursor_rect.width;
+ h = view->cursor_rect.height;
+
+ if (view->x_axis_label)
+ x += border + view->cursor_rect.height; /* coincidentially the right value */
+
+ cairo_push_group (cr);
+
+ gdk_cairo_set_source_color (cr, &style->text[GTK_STATE_NORMAL]);
+ cairo_rectangle (cr, x + 0.5, y + 0.5, w, h);
+ cairo_fill_preserve (cr);
+
+ cairo_set_line_width (cr, 6);
+ cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
+ cairo_stroke (cr);
+
+ gdk_cairo_set_source_color (cr, &style->base[GTK_STATE_NORMAL]);
+ cairo_move_to (cr, x, y);
+ pango_cairo_show_layout (cr, view->cursor_layout);
+
+ cairo_pop_group_to_source (cr);
+ cairo_paint_with_alpha (cr, 0.6);
+ }
+
+ cairo_destroy (cr);
+
+ return FALSE;
+}
+
+static void
+set_cursor (GimpCurveView *view,
+ GdkCursorType new_cursor)
+{
+ if (new_cursor != view->cursor_type)
+ {
+ GdkDisplay *display = gtk_widget_get_display (GTK_WIDGET (view));
+ GdkCursor *cursor = gdk_cursor_new_for_display (display, new_cursor);
+
+ gdk_window_set_cursor (gtk_widget_get_window (GTK_WIDGET (view)), cursor);
+ gdk_cursor_unref (cursor);
+
+ view->cursor_type = new_cursor;
+ }
+}
+
+static gboolean
+gimp_curve_view_button_press (GtkWidget *widget,
+ GdkEventButton *bevent)
+{
+ GimpCurveView *view = GIMP_CURVE_VIEW (widget);
+ GimpCurve *curve = view->curve;
+ GtkAllocation allocation;
+ gint border;
+ gint width, height;
+ gdouble x;
+ gdouble y;
+ gint point;
+ gdouble point_x;
+ gdouble point_y;
+
+ if (! curve || bevent->button != 1)
+ return TRUE;
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ border = GIMP_HISTOGRAM_VIEW (view)->border_width;
+ width = allocation.width - 2 * border;
+ height = allocation.height - 2 * border;
+
+ x = (gdouble) (bevent->x - border) / (gdouble) width;
+ y = (gdouble) (bevent->y - border) / (gdouble) height;
+
+ x = CLAMP (x, 0.0, 1.0);
+ y = CLAMP (y, 0.0, 1.0);
+
+ view->grabbed = TRUE;
+
+ view->orig_curve = GIMP_CURVE (gimp_data_duplicate (GIMP_DATA (curve)));
+
+ set_cursor (view, GDK_TCROSS);
+
+ switch (gimp_curve_get_curve_type (curve))
+ {
+ case GIMP_CURVE_SMOOTH:
+ point = gimp_curve_get_closest_point (curve, x, 1.0 - y,
+ POINT_MAX_DISTANCE /
+ MAX (width, height));
+
+ if (point < 0)
+ {
+ GimpCurvePointType type = GIMP_CURVE_POINT_SMOOTH;
+
+ if (bevent->state & gimp_get_constrain_behavior_mask ())
+ y = 1.0 - gimp_curve_map_value (view->orig_curve, x);
+
+ if (view->selected >= 0)
+ type = gimp_curve_get_point_type (curve, view->selected);
+
+ point = gimp_curve_add_point (curve, x, 1.0 - y);
+
+ gimp_curve_set_point_type (curve, point, type);
+ }
+
+ if (point > 0)
+ gimp_curve_get_point (curve, point - 1, &view->leftmost, NULL);
+ else
+ view->leftmost = -1.0;
+
+ if (point < gimp_curve_get_n_points (curve) - 1)
+ gimp_curve_get_point (curve, point + 1, &view->rightmost, NULL);
+ else
+ view->rightmost = 2.0;
+
+ gimp_curve_view_set_selected (view, point);
+
+ gimp_curve_get_point (curve, point, &point_x, &point_y);
+
+ view->offset_x = point_x - x;
+ view->offset_y = (1.0 - point_y) - y;
+
+ view->point_type = gimp_curve_get_point_type (curve, point);
+ break;
+
+ case GIMP_CURVE_FREE:
+ view->last_x = x;
+ view->last_y = y;
+
+ gimp_curve_set_curve (curve, x, 1.0 - y);
+ break;
+ }
+
+ if (! gtk_widget_has_focus (widget))
+ gtk_widget_grab_focus (widget);
+
+ return TRUE;
+}
+
+static gboolean
+gimp_curve_view_button_release (GtkWidget *widget,
+ GdkEventButton *bevent)
+{
+ GimpCurveView *view = GIMP_CURVE_VIEW (widget);
+
+ if (bevent->button != 1)
+ return TRUE;
+
+ g_clear_object (&view->orig_curve);
+
+ view->offset_x = 0.0;
+ view->offset_y = 0.0;
+
+ view->grabbed = FALSE;
+
+ set_cursor (view, GDK_FLEUR);
+
+ return TRUE;
+}
+
+static gboolean
+gimp_curve_view_motion_notify (GtkWidget *widget,
+ GdkEventMotion *mevent)
+{
+ GimpCurveView *view = GIMP_CURVE_VIEW (widget);
+ GimpCurve *curve = view->curve;
+ GtkAllocation allocation;
+ GdkCursorType new_cursor = GDK_X_CURSOR;
+ gint border;
+ gint width, height;
+ gdouble x;
+ gdouble y;
+ gdouble point_x;
+ gdouble point_y;
+ gint point;
+
+ if (! curve)
+ return TRUE;
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ border = GIMP_HISTOGRAM_VIEW (view)->border_width;
+ width = allocation.width - 2 * border;
+ height = allocation.height - 2 * border;
+
+ x = (gdouble) (mevent->x - border) / (gdouble) width;
+ y = (gdouble) (mevent->y - border) / (gdouble) height;
+
+ x += view->offset_x;
+ y += view->offset_y;
+
+ x = CLAMP (x, 0.0, 1.0);
+ y = CLAMP (y, 0.0, 1.0);
+
+ switch (gimp_curve_get_curve_type (curve))
+ {
+ case GIMP_CURVE_SMOOTH:
+ if (! view->grabbed) /* If no point is grabbed... */
+ {
+ point = gimp_curve_get_closest_point (curve, x, 1.0 - y,
+ POINT_MAX_DISTANCE /
+ MAX (width, height));
+
+ if (point >= 0)
+ {
+ gimp_curve_get_point (curve, point, &point_x, &point_y);
+
+ new_cursor = GDK_FLEUR;
+
+ x = point_x;
+ y = 1.0 - point_y;
+ }
+ else
+ {
+ new_cursor = GDK_TCROSS;
+
+ if (mevent->state & gimp_get_constrain_behavior_mask ())
+ y = 1.0 - gimp_curve_map_value (view->curve, x);
+ }
+ }
+ else /* Else, drag the grabbed point */
+ {
+ new_cursor = GDK_TCROSS;
+
+ if (mevent->state & gimp_get_constrain_behavior_mask ())
+ y = 1.0 - gimp_curve_map_value (view->orig_curve, x);
+
+ gimp_data_freeze (GIMP_DATA (curve));
+
+ if (x > view->leftmost && x < view->rightmost)
+ {
+ if (view->selected < 0)
+ {
+ gimp_curve_view_set_selected (
+ view,
+ gimp_curve_add_point (curve, x, 1.0 - y));
+
+ gimp_curve_set_point_type (curve,
+ view->selected, view->point_type);
+ }
+ else
+ {
+ gimp_curve_set_point (curve, view->selected, x, 1.0 - y);
+ }
+ }
+ else
+ {
+ if (view->selected >= 0)
+ {
+ gimp_curve_delete_point (curve, view->selected);
+
+ gimp_curve_view_set_selected (view, -1);
+ }
+ }
+
+ gimp_data_thaw (GIMP_DATA (curve));
+ }
+ break;
+
+ case GIMP_CURVE_FREE:
+ if (view->grabbed)
+ {
+ gint n_samples = gimp_curve_get_n_samples (curve);
+ gdouble x1, x2;
+ gdouble y1, y2;
+
+ if (view->last_x > x)
+ {
+ x1 = x;
+ x2 = view->last_x;
+ y1 = y;
+ y2 = view->last_y;
+ }
+ else
+ {
+ x1 = view->last_x;
+ x2 = x;
+ y1 = view->last_y;
+ y2 = y;
+ }
+
+ if (x2 != x1)
+ {
+ gint from = ROUND (x1 * (gdouble) (n_samples - 1));
+ gint to = ROUND (x2 * (gdouble) (n_samples - 1));
+ gint i;
+
+ gimp_data_freeze (GIMP_DATA (curve));
+
+ for (i = from; i <= to; i++)
+ {
+ gdouble xpos = (gdouble) i / (gdouble) (n_samples - 1);
+ gdouble ypos = (y1 + ((y2 - y1) * (xpos - x1)) / (x2 - x1));
+
+ xpos = CLAMP (xpos, 0.0, 1.0);
+ ypos = CLAMP (ypos, 0.0, 1.0);
+
+ gimp_curve_set_curve (curve, xpos, 1.0 - ypos);
+ }
+
+ gimp_data_thaw (GIMP_DATA (curve));
+ }
+ else
+ {
+ gimp_curve_set_curve (curve, x, 1.0 - y);
+ }
+
+ view->last_x = x;
+ view->last_y = y;
+ }
+
+ if (mevent->state & GDK_BUTTON1_MASK)
+ new_cursor = GDK_TCROSS;
+ else
+ new_cursor = GDK_PENCIL;
+
+ break;
+ }
+
+ set_cursor (view, new_cursor);
+
+ gimp_curve_view_set_cursor (view, x, y);
+
+ return TRUE;
+}
+
+static gboolean
+gimp_curve_view_leave_notify (GtkWidget *widget,
+ GdkEventCrossing *cevent)
+{
+ GimpCurveView *view = GIMP_CURVE_VIEW (widget);
+
+ gimp_curve_view_unset_cursor (view);
+
+ return TRUE;
+}
+
+static gboolean
+gimp_curve_view_key_press (GtkWidget *widget,
+ GdkEventKey *kevent)
+{
+ GimpCurveView *view = GIMP_CURVE_VIEW (widget);
+ GimpCurve *curve = view->curve;
+ gboolean handled = FALSE;
+
+ if (! view->grabbed &&
+ curve &&
+ gimp_curve_get_curve_type (curve) == GIMP_CURVE_SMOOTH &&
+ view->selected >= 0)
+ {
+ gint i = view->selected;
+ gdouble x, y;
+
+ gimp_curve_get_point (curve, i, NULL, &y);
+
+ switch (kevent->keyval)
+ {
+ case GDK_KEY_Left:
+ for (i = i - 1; i >= 0 && ! handled; i--)
+ {
+ gimp_curve_get_point (curve, i, &x, NULL);
+
+ if (x >= 0.0)
+ {
+ gimp_curve_view_set_selected (view, i);
+
+ handled = TRUE;
+ }
+ }
+ break;
+
+ case GDK_KEY_Right:
+ for (i = i + 1; i < curve->n_points && ! handled; i++)
+ {
+ gimp_curve_get_point (curve, i, &x, NULL);
+
+ if (x >= 0.0)
+ {
+ gimp_curve_view_set_selected (view, i);
+
+ handled = TRUE;
+ }
+ }
+ break;
+
+ case GDK_KEY_Up:
+ if (y < 1.0)
+ {
+ y = y + (kevent->state & GDK_SHIFT_MASK ?
+ (16.0 / 255.0) : (1.0 / 255.0));
+
+ gimp_curve_move_point (curve, i, CLAMP (y, 0.0, 1.0));
+
+ handled = TRUE;
+ }
+ break;
+
+ case GDK_KEY_Down:
+ if (y > 0)
+ {
+ y = y - (kevent->state & GDK_SHIFT_MASK ?
+ (16.0 / 255.0) : (1.0 / 255.0));
+
+ gimp_curve_move_point (curve, i, CLAMP (y, 0.0, 1.0));
+
+ handled = TRUE;
+ }
+ break;
+
+ case GDK_KEY_Delete:
+ gimp_curve_delete_point (curve, i);
+ break;
+
+ default:
+ break;
+ }
+ }
+
+ if (handled)
+ {
+ set_cursor (view, GDK_TCROSS);
+
+ return TRUE;
+ }
+
+ return GTK_WIDGET_CLASS (parent_class)->key_press_event (widget, kevent);
+}
+
+static void
+gimp_curve_view_cut_clipboard (GimpCurveView *view)
+{
+ g_printerr ("%s\n", G_STRFUNC);
+
+ if (! view->curve || ! view->gimp)
+ {
+ gtk_widget_error_bell (GTK_WIDGET (view));
+ return;
+ }
+
+ gimp_curve_view_copy_clipboard (view);
+
+ gimp_curve_reset (view->curve, FALSE);
+}
+
+static void
+gimp_curve_view_copy_clipboard (GimpCurveView *view)
+{
+ GimpCurve *copy;
+
+ g_printerr ("%s\n", G_STRFUNC);
+
+ if (! view->curve || ! view->gimp)
+ {
+ gtk_widget_error_bell (GTK_WIDGET (view));
+ return;
+ }
+
+ copy = GIMP_CURVE (gimp_data_duplicate (GIMP_DATA (view->curve)));
+ gimp_clipboard_set_curve (view->gimp, copy);
+ g_object_unref (copy);
+}
+
+static void
+gimp_curve_view_paste_clipboard (GimpCurveView *view)
+{
+ GimpCurve *copy;
+
+ g_printerr ("%s\n", G_STRFUNC);
+
+ if (! view->curve || ! view->gimp)
+ {
+ gtk_widget_error_bell (GTK_WIDGET (view));
+ return;
+ }
+
+ copy = gimp_clipboard_get_curve (view->gimp);
+
+ if (copy)
+ {
+ gimp_config_copy (GIMP_CONFIG (copy),
+ GIMP_CONFIG (view->curve), 0);
+ g_object_unref (copy);
+ }
+}
+
+static void
+gimp_curve_view_curve_dirty (GimpCurve *curve,
+ GimpCurveView *view)
+{
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+}
+
+static void
+gimp_curve_view_curve_notify_n_points (GimpCurve *curve,
+ GParamSpec *pspec,
+ GimpCurveView *view)
+{
+ gimp_curve_view_set_selected (view, -1);
+}
+
+
+/* public functions */
+
+GtkWidget *
+gimp_curve_view_new (void)
+{
+ return g_object_new (GIMP_TYPE_CURVE_VIEW, NULL);
+}
+
+void
+gimp_curve_view_set_curve (GimpCurveView *view,
+ GimpCurve *curve,
+ const GimpRGB *color)
+{
+ g_return_if_fail (GIMP_IS_CURVE_VIEW (view));
+ g_return_if_fail (curve == NULL || GIMP_IS_CURVE (curve));
+
+ if (view->curve == curve)
+ return;
+
+ if (view->curve)
+ {
+ g_signal_handlers_disconnect_by_func (view->curve,
+ gimp_curve_view_curve_dirty,
+ view);
+ g_signal_handlers_disconnect_by_func (view->curve,
+ gimp_curve_view_curve_notify_n_points,
+ view);
+ g_object_unref (view->curve);
+ }
+
+ view->curve = curve;
+
+ if (view->curve)
+ {
+ g_object_ref (view->curve);
+ g_signal_connect (view->curve, "dirty",
+ G_CALLBACK (gimp_curve_view_curve_dirty),
+ view);
+ g_signal_connect (view->curve, "notify::n-points",
+ G_CALLBACK (gimp_curve_view_curve_notify_n_points),
+ view);
+ }
+
+ if (view->curve_color)
+ g_free (view->curve_color);
+
+ if (color)
+ view->curve_color = g_memdup (color, sizeof (GimpRGB));
+ else
+ view->curve_color = NULL;
+
+ gimp_curve_view_set_selected (view, -1);
+
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+}
+
+GimpCurve *
+gimp_curve_view_get_curve (GimpCurveView *view)
+{
+ g_return_val_if_fail (GIMP_IS_CURVE_VIEW (view), NULL);
+
+ return view->curve;
+}
+
+void
+gimp_curve_view_add_background (GimpCurveView *view,
+ GimpCurve *curve,
+ const GimpRGB *color)
+{
+ GList *list;
+ BGCurve *bg;
+
+ g_return_if_fail (GIMP_IS_CURVE_VIEW (view));
+ g_return_if_fail (GIMP_IS_CURVE (curve));
+
+ for (list = view->bg_curves; list; list = g_list_next (list))
+ {
+ bg = list->data;
+
+ g_return_if_fail (curve != bg->curve);
+ }
+
+ bg = g_slice_new0 (BGCurve);
+
+ bg->curve = g_object_ref (curve);
+
+ if (color)
+ {
+ bg->color = *color;
+ bg->color_set = TRUE;
+ }
+
+ g_signal_connect (bg->curve, "dirty",
+ G_CALLBACK (gimp_curve_view_curve_dirty),
+ view);
+
+ view->bg_curves = g_list_append (view->bg_curves, bg);
+
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+}
+
+void
+gimp_curve_view_remove_background (GimpCurveView *view,
+ GimpCurve *curve)
+{
+ GList *list;
+
+ g_return_if_fail (GIMP_IS_CURVE_VIEW (view));
+ g_return_if_fail (GIMP_IS_CURVE (curve));
+
+ for (list = view->bg_curves; list; list = g_list_next (list))
+ {
+ BGCurve *bg = list->data;
+
+ if (bg->curve == curve)
+ {
+ g_signal_handlers_disconnect_by_func (bg->curve,
+ gimp_curve_view_curve_dirty,
+ view);
+ g_object_unref (bg->curve);
+
+ view->bg_curves = g_list_remove (view->bg_curves, bg);
+
+ g_slice_free (BGCurve, bg);
+
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+
+ break;
+ }
+ }
+
+ if (! list)
+ g_return_if_reached ();
+}
+
+void
+gimp_curve_view_remove_all_backgrounds (GimpCurveView *view)
+{
+ g_return_if_fail (GIMP_IS_CURVE_VIEW (view));
+
+ while (view->bg_curves)
+ {
+ BGCurve *bg = view->bg_curves->data;
+
+ g_signal_handlers_disconnect_by_func (bg->curve,
+ gimp_curve_view_curve_dirty,
+ view);
+ g_object_unref (bg->curve);
+
+ view->bg_curves = g_list_remove (view->bg_curves, bg);
+
+ g_slice_free (BGCurve, bg);
+ }
+
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+}
+
+void
+gimp_curve_view_set_selected (GimpCurveView *view,
+ gint selected)
+{
+ g_return_if_fail (GIMP_IS_CURVE_VIEW (view));
+
+ if (selected != view->selected)
+ {
+ view->selected = selected;
+
+ g_signal_emit (view, curve_view_signals[SELECTION_CHANGED], 0);
+
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+ }
+}
+
+gint
+gimp_curve_view_get_selected (GimpCurveView *view)
+{
+ g_return_val_if_fail (GIMP_IS_CURVE_VIEW (view), -1);
+
+ if (view->curve && view->selected < gimp_curve_get_n_points (view->curve))
+ return view->selected;
+ else
+ return -1;
+}
+
+void
+gimp_curve_view_set_range_x (GimpCurveView *view,
+ gdouble min,
+ gdouble max)
+{
+ g_return_if_fail (GIMP_IS_CURVE_VIEW (view));
+
+ view->range_x_min = min;
+ view->range_x_max = max;
+
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+}
+
+void
+gimp_curve_view_set_range_y (GimpCurveView *view,
+ gdouble min,
+ gdouble max)
+{
+ g_return_if_fail (GIMP_IS_CURVE_VIEW (view));
+
+ view->range_y_min = min;
+ view->range_y_max = max;
+
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+}
+
+void
+gimp_curve_view_set_xpos (GimpCurveView *view,
+ gdouble x)
+{
+ g_return_if_fail (GIMP_IS_CURVE_VIEW (view));
+
+ view->xpos = x;
+
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+}
+
+void
+gimp_curve_view_set_x_axis_label (GimpCurveView *view,
+ const gchar *label)
+{
+ g_return_if_fail (GIMP_IS_CURVE_VIEW (view));
+
+ if (view->x_axis_label)
+ g_free (view->x_axis_label);
+
+ view->x_axis_label = g_strdup (label);
+
+ g_object_notify (G_OBJECT (view), "x-axis-label");
+
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+}
+
+void
+gimp_curve_view_set_y_axis_label (GimpCurveView *view,
+ const gchar *label)
+{
+ g_return_if_fail (GIMP_IS_CURVE_VIEW (view));
+
+ if (view->y_axis_label)
+ g_free (view->y_axis_label);
+
+ view->y_axis_label = g_strdup (label);
+
+ g_object_notify (G_OBJECT (view), "y-axis-label");
+
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+}
+
+
+/* private functions */
+
+static void
+gimp_curve_view_set_cursor (GimpCurveView *view,
+ gdouble x,
+ gdouble y)
+{
+ view->cursor_x = x;
+ view->cursor_y = y;
+
+ /* TODO: only invalidate the cursor label area */
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+}
+
+static void
+gimp_curve_view_unset_cursor (GimpCurveView *view)
+{
+ view->cursor_x = -1.0;
+ view->cursor_y = -1.0;
+
+ /* TODO: only invalidate the cursor label area */
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+}