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gimp/app/gui/gradient-editor.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* Gradient editor module copyight (C) 1996-1997 Federico Mena Quintero
* federico@nuclecu.unam.mx
*
* 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 2 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 PURIGHTE. 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* Special thanks to:
*
* Luis Albarran (luis4@mindspring.com) - Nice UI suggestions
*
* Miguel de Icaza (miguel@nuclecu.unam.mx) - Pop-up menu suggestion
*
* Marcelo Malheiros (malheiro@dca.fee.unicamp.br) - many, many
* suggestions, nice gradient files
*
* Adam Moss (adam@uunet.pipex.com) - idea for the hint bar
*
* Everyone on #gimp - many suggestions
*/
/* TODO:
*
* - Fix memory leaks: grad_free_gradient_editor() and any others
* which I may have missed.
*
* - Add all of Marcelo's neat suggestions:
* - Hue rotate, saturation, brightness, contrast.
*
* - Better handling of bogus gradient files and inconsistent
* segments. Do not loop indefinitely in seg_get_segment_at() if
* there is a missing segment between two others.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <gtk/gtk.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpbase/gimpbase.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "gui-types.h"
#include "core/gimp.h"
#include "core/gimpcontainer.h"
#include "core/gimpcontext.h"
#include "core/gimpdatafactory.h"
#include "core/gimpgradient.h"
#include "widgets/gimpdnd.h"
#include "widgets/gimpitemfactory.h"
#include "gradient-editor.h"
#include "gimprc.h"
#include "libgimp/gimpintl.h"
#define EPSILON 1e-10
#define GRAD_SCROLLBAR_STEP_SIZE 0.05
#define GRAD_SCROLLBAR_PAGE_SIZE 0.75
#define GRAD_PREVIEW_WIDTH 600
#define GRAD_PREVIEW_HEIGHT 64
#define GRAD_CONTROL_HEIGHT 10
#define GRAD_MOVE_TIME 150 /* ms between mouse click and detection of movement in gradient control */
#define GRAD_PREVIEW_EVENT_MASK (GDK_EXPOSURE_MASK | \
GDK_LEAVE_NOTIFY_MASK | \
GDK_POINTER_MOTION_MASK | \
GDK_POINTER_MOTION_HINT_MASK | \
GDK_BUTTON_PRESS_MASK | \
GDK_BUTTON_RELEASE_MASK)
#define GRAD_CONTROL_EVENT_MASK (GDK_EXPOSURE_MASK | \
GDK_LEAVE_NOTIFY_MASK | \
GDK_POINTER_MOTION_MASK | \
GDK_POINTER_MOTION_HINT_MASK | \
GDK_BUTTON_PRESS_MASK | \
GDK_BUTTON_RELEASE_MASK | \
GDK_BUTTON1_MOTION_MASK)
/* local function prototypes */
static void gradient_editor_gradient_changed (GimpContext *context,
GimpGradient *gradient,
GradientEditor *editor);
static void gradient_editor_close_callback (GtkWidget *widget,
GradientEditor *editor);
static void gradient_editor_name_activate (GtkWidget *widget,
GradientEditor *editor);
static void gradient_editor_name_focus_out (GtkWidget *widget,
GdkEvent *event,
GradientEditor *editor);
static void gradient_editor_drop_gradient (GtkWidget *widget,
GimpViewable *viewable,
gpointer data);
static void gradient_editor_scrollbar_update (GtkAdjustment *adjustment,
GradientEditor *editor);
static void gradient_editor_zoom_all_callback (GtkWidget *widget,
GradientEditor *editor);
static void gradient_editor_zoom_out_callback (GtkWidget *widget,
GradientEditor *editor);
static void gradient_editor_zoom_in_callback (GtkWidget *widget,
GradientEditor *editor);
static void gradient_editor_instant_update_update (GtkWidget *widget,
GradientEditor *editor);
static void gradient_editor_set_hint (GradientEditor *editor,
const gchar *str);
/* Gradient preview functions */
static gint preview_events (GtkWidget *widget,
GdkEvent *event,
GradientEditor *editor);
static void preview_set_hint (GradientEditor *editor,
gint x);
static void preview_set_foreground (GradientEditor *editor,
gint x);
static void preview_set_background (GradientEditor *editor,
gint x);
static void preview_update (GradientEditor *editor,
gboolean recalculate);
static void preview_fill_image (GradientEditor *editor,
gint width,
gint height,
gdouble left,
gdouble right);
/* Gradient control functions */
static gint control_events (GtkWidget *widget,
GdkEvent *event,
GradientEditor *editor);
static void control_do_hint (GradientEditor *editor,
gint x,
gint y);
static void control_button_press (GradientEditor *editor,
gint x,
gint y,
guint button,
guint state);
static gboolean control_point_in_handle (GradientEditor *editor,
GimpGradient *gradient,
gint x,
gint y,
GimpGradientSegment *seg,
GradientEditorDragMode handle);
static void control_select_single_segment (GradientEditor *editor,
GimpGradientSegment *seg);
static void control_extend_selection (GradientEditor *editor,
GimpGradientSegment *seg,
gdouble pos);
static void control_motion (GradientEditor *editor,
GimpGradient *gradient,
gint x);
static void control_compress_left (GimpGradientSegment *range_l,
GimpGradientSegment *range_r,
GimpGradientSegment *drag_seg,
gdouble pos);
static void control_compress_range (GimpGradientSegment *range_l,
GimpGradientSegment *range_r,
gdouble new_l,
gdouble new_r);
static double control_move (GradientEditor *editor,
GimpGradientSegment *range_l,
GimpGradientSegment *range_r,
gdouble delta);
/* Control update/redraw functions */
static void control_update (GradientEditor *editor,
GimpGradient *gradient,
gboolean recalculate);
static void control_draw (GradientEditor *editor,
GimpGradient *gradient,
GdkPixmap *pixmap,
gint width,
gint height,
gdouble left,
gdouble right);
static void control_draw_normal_handle (GradientEditor *editor,
GdkPixmap *pixmap,
gdouble pos,
gint height);
static void control_draw_middle_handle (GradientEditor *editor,
GdkPixmap *pixmap,
gdouble pos,
gint height);
static void control_draw_handle (GdkPixmap *pixmap,
GdkGC *border_gc,
GdkGC *fill_gc,
gint xpos,
gint height);
static gint control_calc_p_pos (GradientEditor *editor,
gdouble pos);
static gdouble control_calc_g_pos (GradientEditor *editor,
gint pos);
/* Segment functions */
static void seg_get_closest_handle (GimpGradient *grad,
gdouble pos,
GimpGradientSegment **seg,
GradientEditorDragMode *handle);
/* public functions */
GradientEditor *
gradient_editor_new (Gimp *gimp)
{
GradientEditor *editor;
GtkWidget *main_vbox;
GtkWidget *hbox;
GtkWidget *vbox;
GtkWidget *vbox2;
GtkWidget *button;
GtkWidget *image;
GtkWidget *frame;
editor = g_new (GradientEditor, 1);
editor->context = gimp_context_new (gimp, "Gradient Editor", NULL);
g_signal_connect (G_OBJECT (editor->context), "gradient_changed",
G_CALLBACK (gradient_editor_gradient_changed),
editor);
/* Shell and main vbox */
editor->shell =
gimp_dialog_new (_("Gradient Editor"), "gradient_editor",
gimp_standard_help_func,
"dialogs/gradient_editor/gradient_editor.html",
GTK_WIN_POS_NONE,
FALSE, TRUE, FALSE,
"_delete_event_", gradient_editor_close_callback,
editor, NULL, NULL, FALSE, TRUE,
NULL);
main_vbox = gtk_vbox_new (FALSE, 4);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 4);
gtk_container_add (GTK_CONTAINER (GTK_DIALOG (editor->shell)->vbox),
main_vbox);
gtk_widget_show (main_vbox);
vbox = gtk_vbox_new (FALSE, 1);
gtk_box_pack_start (GTK_BOX (main_vbox), vbox, TRUE, TRUE, 0);
gtk_widget_show (vbox);
/* Gradient's name */
editor->name = gtk_entry_new ();
gtk_box_pack_start (GTK_BOX (vbox), editor->name, FALSE, FALSE, 0);
gtk_widget_show (editor->name);
g_signal_connect (G_OBJECT (editor->name), "activate",
G_CALLBACK (gradient_editor_name_activate),
editor);
g_signal_connect (G_OBJECT (editor->name), "focus_out_event",
G_CALLBACK (gradient_editor_name_focus_out),
editor);
/* Frame for gradient preview and gradient control */
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE, 0);
gtk_widget_show (frame);
vbox2 = gtk_vbox_new (FALSE, 0);
gtk_container_add (GTK_CONTAINER (frame), vbox2);
gtk_widget_show (vbox2);
/* Gradient preview */
editor->preview_rows[0] = NULL;
editor->preview_rows[1] = NULL;
editor->preview_last_x = 0;
editor->preview_button_down = FALSE;
editor->preview = gtk_preview_new (GTK_PREVIEW_COLOR);
gtk_preview_set_dither (GTK_PREVIEW (editor->preview), GDK_RGB_DITHER_MAX);
gtk_preview_size (GTK_PREVIEW (editor->preview),
GRAD_PREVIEW_WIDTH, GRAD_PREVIEW_HEIGHT);
/* Enable auto-resizing of the preview but ensure a minimal size */
gtk_widget_set_usize (editor->preview,
GRAD_PREVIEW_WIDTH, GRAD_PREVIEW_HEIGHT);
gtk_preview_set_expand (GTK_PREVIEW (editor->preview), TRUE);
gtk_widget_set_events (editor->preview, GRAD_PREVIEW_EVENT_MASK);
g_signal_connect (G_OBJECT (editor->preview), "event",
G_CALLBACK (preview_events),
editor);
gimp_gtk_drag_dest_set_by_type (editor->preview,
GTK_DEST_DEFAULT_ALL,
GIMP_TYPE_GRADIENT,
GDK_ACTION_COPY);
gimp_dnd_viewable_dest_set (GTK_WIDGET (editor->preview),
GIMP_TYPE_GRADIENT,
gradient_editor_drop_gradient,
editor);
gtk_box_pack_start (GTK_BOX (vbox2), editor->preview, TRUE, TRUE, 0);
gtk_widget_show (editor->preview);
/* Gradient control */
editor->control_pixmap = NULL;
editor->control_drag_segment = NULL;
editor->control_sel_l = NULL;
editor->control_sel_r = NULL;
editor->control_drag_mode = GRAD_DRAG_NONE;
editor->control_click_time = 0;
editor->control_compress = FALSE;
editor->control_last_x = 0;
editor->control_last_gx = 0.0;
editor->control_orig_pos = 0.0;
editor->control = gtk_drawing_area_new ();
gtk_drawing_area_size (GTK_DRAWING_AREA (editor->control),
GRAD_PREVIEW_WIDTH, GRAD_CONTROL_HEIGHT);
gtk_widget_set_events (editor->control, GRAD_CONTROL_EVENT_MASK);
gtk_box_pack_start (GTK_BOX (vbox2), editor->control, FALSE, FALSE, 0);
gtk_widget_show (editor->control);
g_signal_connect (G_OBJECT (editor->control), "event",
G_CALLBACK (control_events),
editor);
/* Scrollbar */
editor->zoom_factor = 1;
editor->scroll_data = gtk_adjustment_new (0.0, 0.0, 1.0,
1.0 * GRAD_SCROLLBAR_STEP_SIZE,
1.0 * GRAD_SCROLLBAR_PAGE_SIZE,
1.0);
g_signal_connect (G_OBJECT (editor->scroll_data), "value_changed",
G_CALLBACK (gradient_editor_scrollbar_update),
editor);
g_signal_connect (G_OBJECT (editor->scroll_data), "changed",
G_CALLBACK (gradient_editor_scrollbar_update),
editor);
editor->scrollbar = gtk_hscrollbar_new (GTK_ADJUSTMENT (editor->scroll_data));
gtk_range_set_update_policy (GTK_RANGE (editor->scrollbar),
GTK_UPDATE_CONTINUOUS);
gtk_box_pack_start (GTK_BOX (vbox), editor->scrollbar, FALSE, FALSE, 0);
gtk_widget_show (editor->scrollbar);
/* Horizontal box for zoom controls and instant update toggle */
hbox = gtk_hbox_new (FALSE, 4);
gtk_box_pack_start (GTK_BOX (main_vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
/* + and - buttons */
button = gtk_button_new ();
GTK_WIDGET_UNSET_FLAGS (button, GTK_RECEIVES_DEFAULT);
gtk_box_pack_end (GTK_BOX (hbox), button, FALSE, FALSE, 0);
gtk_widget_show (button);
image = gtk_image_new_from_stock (GTK_STOCK_ZOOM_OUT, GTK_ICON_SIZE_MENU);
gtk_container_add (GTK_CONTAINER (button), image);
gtk_widget_show (image);
g_signal_connect (G_OBJECT (button), "clicked",
G_CALLBACK (gradient_editor_zoom_out_callback),
editor);
button = gtk_button_new ();
GTK_WIDGET_UNSET_FLAGS (button, GTK_RECEIVES_DEFAULT);
gtk_box_pack_end (GTK_BOX (hbox), button, FALSE, FALSE, 0);
gtk_widget_show (button);
image = gtk_image_new_from_stock (GTK_STOCK_ZOOM_IN, GTK_ICON_SIZE_MENU);
gtk_container_add (GTK_CONTAINER (button), image);
gtk_widget_show (image);
g_signal_connect (G_OBJECT (button), "clicked",
G_CALLBACK (gradient_editor_zoom_in_callback),
editor);
/* Zoom all button */
button = gtk_button_new_with_label (_("Zoom all"));
gtk_misc_set_padding (GTK_MISC (GTK_BIN (button)->child), 2, 0);
gtk_box_pack_end (GTK_BOX (hbox), button, FALSE, FALSE, 0);
gtk_widget_show (button);
GTK_WIDGET_UNSET_FLAGS (button, GTK_RECEIVES_DEFAULT);
g_signal_connect (G_OBJECT (button), "clicked",
G_CALLBACK (gradient_editor_zoom_all_callback),
editor);
/* Instant update toggle */
editor->instant_update = TRUE;
button = gtk_check_button_new_with_label (_("Instant update"));
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button), TRUE);
gtk_box_pack_end (GTK_BOX (hbox), button, FALSE, FALSE, 0);
gtk_widget_show (button);
g_signal_connect (G_OBJECT (button), "toggled",
G_CALLBACK (gradient_editor_instant_update_update),
editor);
/* Hint bar */
hbox = GTK_DIALOG (editor->shell)->action_area;
gtk_container_set_border_width (GTK_CONTAINER (hbox), 4);
gtk_box_set_homogeneous (GTK_BOX (hbox), FALSE);
editor->hint_label = gtk_label_new ("");
gtk_misc_set_alignment (GTK_MISC (editor->hint_label), 0.0, 0.5);
gtk_box_pack_start (GTK_BOX (hbox), editor->hint_label, FALSE, FALSE, 0);
gtk_widget_show (editor->hint_label);
/* Initialize other data */
editor->left_saved_segments = NULL;
editor->left_saved_dirty = FALSE;
editor->right_saved_segments = NULL;
editor->right_saved_dirty = FALSE;
editor->saved_colors[0].r = 0.0; /* Black */
editor->saved_colors[0].g = 0.0;
editor->saved_colors[0].b = 0.0;
editor->saved_colors[0].a = 1.0;
editor->saved_colors[1].r = 0.5; /* 50% Gray */
editor->saved_colors[1].g = 0.5;
editor->saved_colors[1].b = 0.5;
editor->saved_colors[1].a = 1.0;
editor->saved_colors[2].r = 1.0; /* White */
editor->saved_colors[2].g = 1.0;
editor->saved_colors[2].b = 1.0;
editor->saved_colors[2].a = 1.0;
editor->saved_colors[3].r = 0.0; /* Clear */
editor->saved_colors[3].g = 0.0;
editor->saved_colors[3].b = 0.0;
editor->saved_colors[3].a = 0.0;
editor->saved_colors[4].r = 1.0; /* Red */
editor->saved_colors[4].g = 0.0;
editor->saved_colors[4].b = 0.0;
editor->saved_colors[4].a = 1.0;
editor->saved_colors[5].r = 1.0; /* Yellow */
editor->saved_colors[5].g = 1.0;
editor->saved_colors[5].b = 0.0;
editor->saved_colors[5].a = 1.0;
editor->saved_colors[6].r = 0.0; /* Green */
editor->saved_colors[6].g = 1.0;
editor->saved_colors[6].b = 0.0;
editor->saved_colors[6].a = 1.0;
editor->saved_colors[7].r = 0.0; /* Cyan */
editor->saved_colors[7].g = 1.0;
editor->saved_colors[7].b = 1.0;
editor->saved_colors[7].a = 1.0;
editor->saved_colors[8].r = 0.0; /* Blue */
editor->saved_colors[8].g = 0.0;
editor->saved_colors[8].b = 1.0;
editor->saved_colors[8].a = 1.0;
editor->saved_colors[9].r = 1.0; /* Magenta */
editor->saved_colors[9].g = 0.0;
editor->saved_colors[9].b = 1.0;
editor->saved_colors[9].a = 1.0;
if (gimp_container_num_children (gimp->gradient_factory->container))
{
gimp_context_set_gradient (editor->context,
GIMP_GRADIENT (gimp_container_get_child_by_index (gimp->gradient_factory->container, 0)));
}
else
{
GimpGradient *gradient;
gradient = GIMP_GRADIENT (gimp_gradient_new (_("Default")));
gimp_container_add (gimp->gradient_factory->container,
GIMP_OBJECT (gradient));
}
gtk_widget_show (editor->shell);
return editor;
}
void
gradient_editor_set_gradient (GradientEditor *editor,
GimpGradient *gradient)
{
g_return_if_fail (editor != NULL);
g_return_if_fail (GIMP_IS_GRADIENT (gradient));
gimp_context_set_gradient (editor->context, gradient);
}
void
gradient_editor_free (GradientEditor *editor)
{
g_return_if_fail (editor != NULL);
}
void
gradient_editor_update (GradientEditor *editor,
GradientEditorUpdateMask flags)
{
GimpGradient *gradient;
gradient = gimp_context_get_gradient (editor->context);
if (flags & GRAD_UPDATE_GRADIENT)
{
preview_update (editor, TRUE);
}
if (flags & GRAD_UPDATE_PREVIEW)
preview_update (editor, TRUE);
if (flags & GRAD_UPDATE_CONTROL)
control_update (editor, gradient, FALSE);
if (flags & GRAD_RESET_CONTROL)
control_update (editor, gradient, TRUE);
}
/* private functions */
static void
gradient_editor_gradient_changed (GimpContext *context,
GimpGradient *gradient,
GradientEditor *editor)
{
gtk_entry_set_text (GTK_ENTRY (editor->name),
gimp_object_get_name (GIMP_OBJECT (gradient)));
gradient_editor_update (editor, GRAD_UPDATE_PREVIEW | GRAD_RESET_CONTROL);
}
static void
gradient_editor_close_callback (GtkWidget *widget,
GradientEditor *editor)
{
if (GTK_WIDGET_VISIBLE (editor->shell))
gtk_widget_hide (editor->shell);
}
static void
gradient_editor_name_activate (GtkWidget *widget,
GradientEditor *editor)
{
GimpGradient *gradient;
const gchar *entry_text;
gradient = gimp_context_get_gradient (editor->context);
entry_text = gtk_entry_get_text (GTK_ENTRY (widget));
gimp_object_set_name (GIMP_OBJECT (gradient), entry_text);
}
static void
gradient_editor_name_focus_out (GtkWidget *widget,
GdkEvent *event,
GradientEditor *editor)
{
gradient_editor_name_activate (widget, editor);
}
static void
gradient_editor_drop_gradient (GtkWidget *widget,
GimpViewable *viewable,
gpointer data)
{
GradientEditor *editor;
editor = (GradientEditor *) data;
gradient_editor_set_gradient (editor, GIMP_GRADIENT (viewable));
}
static void
gradient_editor_scrollbar_update (GtkAdjustment *adjustment,
GradientEditor *editor)
{
gchar *str;
str = g_strdup_printf (_("Zoom factor: %d:1 Displaying [%0.6f, %0.6f]"),
editor->zoom_factor, adjustment->value,
adjustment->value + adjustment->page_size);
gradient_editor_set_hint (editor, str);
g_free (str);
gradient_editor_update (editor, GRAD_UPDATE_PREVIEW | GRAD_UPDATE_CONTROL);
}
static void
gradient_editor_zoom_all_callback (GtkWidget *widget,
GradientEditor *editor)
{
GtkAdjustment *adjustment;
adjustment = GTK_ADJUSTMENT (editor->scroll_data);
editor->zoom_factor = 1;
adjustment->value = 0.0;
adjustment->page_size = 1.0;
adjustment->step_increment = 1.0 * GRAD_SCROLLBAR_STEP_SIZE;
adjustment->page_increment = 1.0 * GRAD_SCROLLBAR_PAGE_SIZE;
gtk_adjustment_changed (GTK_ADJUSTMENT (editor->scroll_data));
}
static void
gradient_editor_zoom_out_callback (GtkWidget *widget,
GradientEditor *editor)
{
GtkAdjustment *adjustment;
gdouble old_value;
gdouble value;
gdouble old_page_size;
gdouble page_size;
if (editor->zoom_factor <= 1)
return;
adjustment = GTK_ADJUSTMENT (editor->scroll_data);
old_value = adjustment->value;
old_page_size = adjustment->page_size;
editor->zoom_factor--;
page_size = 1.0 / editor->zoom_factor;
value = old_value - (page_size - old_page_size) / 2.0;
if (value < 0.0)
value = 0.0;
else if ((value + page_size) > 1.0)
value = 1.0 - page_size;
adjustment->value = value;
adjustment->page_size = page_size;
adjustment->step_increment = page_size * GRAD_SCROLLBAR_STEP_SIZE;
adjustment->page_increment = page_size * GRAD_SCROLLBAR_PAGE_SIZE;
gtk_adjustment_changed (GTK_ADJUSTMENT (editor->scroll_data));
}
static void
gradient_editor_zoom_in_callback (GtkWidget *widget,
GradientEditor *editor)
{
GtkAdjustment *adjustment;
gdouble old_value;
gdouble old_page_size;
gdouble page_size;
adjustment = GTK_ADJUSTMENT (editor->scroll_data);
old_value = adjustment->value;
old_page_size = adjustment->page_size;
editor->zoom_factor++;
page_size = 1.0 / editor->zoom_factor;
adjustment->value = old_value + (old_page_size - page_size) / 2.0;
adjustment->page_size = page_size;
adjustment->step_increment = page_size * GRAD_SCROLLBAR_STEP_SIZE;
adjustment->page_increment = page_size * GRAD_SCROLLBAR_PAGE_SIZE;
gtk_adjustment_changed (GTK_ADJUSTMENT (editor->scroll_data));
}
static void
gradient_editor_instant_update_update (GtkWidget *widget,
GradientEditor *editor)
{
if (GTK_TOGGLE_BUTTON (widget)->active)
{
editor->instant_update = TRUE;
gtk_range_set_update_policy (GTK_RANGE (editor->scrollbar),
GTK_UPDATE_CONTINUOUS);
}
else
{
editor->instant_update = FALSE;
gtk_range_set_update_policy (GTK_RANGE (editor->scrollbar),
GTK_UPDATE_DELAYED);
}
}
static void
gradient_editor_set_hint (GradientEditor *editor,
const gchar *str)
{
gtk_label_set_text (GTK_LABEL (editor->hint_label), str);
}
/***** Gradient preview functions *****/
static gint
preview_events (GtkWidget *widget,
GdkEvent *event,
GradientEditor *editor)
{
gint x, y;
GdkEventButton *bevent;
GdkEventMotion *mevent;
GdkEventScroll *sevent;
switch (event->type)
{
case GDK_EXPOSE:
preview_update (editor, FALSE);
return FALSE;
case GDK_LEAVE_NOTIFY:
gradient_editor_set_hint (editor, "");
break;
case GDK_MOTION_NOTIFY:
gtk_widget_get_pointer (editor->preview, &x, &y);
mevent = (GdkEventMotion *) event;
if (x != editor->preview_last_x)
{
editor->preview_last_x = x;
if (editor->preview_button_down)
{
if (mevent->state & GDK_CONTROL_MASK)
preview_set_background (editor, x);
else
preview_set_foreground (editor, x);
}
else
{
preview_set_hint (editor, x);
}
}
break;
case GDK_BUTTON_PRESS:
gtk_widget_get_pointer (editor->preview, &x, &y);
bevent = (GdkEventButton *) event;
switch (bevent->button)
{
case 1:
editor->preview_last_x = x;
editor->preview_button_down = TRUE;
if (bevent->state & GDK_CONTROL_MASK)
preview_set_background (editor, x);
else
preview_set_foreground (editor, x);
break;
case 3:
{
GtkItemFactory *factory;
factory = gtk_item_factory_from_path ("<GradientEditor>");
gimp_item_factory_popup_with_data (factory, editor, NULL);
}
break;
default:
break;
}
break;
case GDK_SCROLL:
sevent = (GdkEventScroll *) event;
if (sevent->state & GDK_SHIFT_MASK)
{
if (sevent->direction == GDK_SCROLL_UP)
gradient_editor_zoom_in_callback (NULL, editor);
else
gradient_editor_zoom_out_callback (NULL, editor);
}
else
{
GtkAdjustment *adj = GTK_ADJUSTMENT (editor->scroll_data);
gfloat new_value = adj->value + ((sevent->direction == GDK_SCROLL_UP) ?
-adj->page_increment / 2 :
adj->page_increment / 2);
new_value = CLAMP (new_value, adj->lower, adj->upper - adj->page_size);
gtk_adjustment_set_value (adj, new_value);
}
break;
case GDK_BUTTON_RELEASE:
if (editor->preview_button_down)
{
gtk_widget_get_pointer (editor->preview, &x, &y);
bevent = (GdkEventButton *) event;
editor->preview_last_x = x;
editor->preview_button_down = FALSE;
if (bevent->state & GDK_CONTROL_MASK)
preview_set_background (editor, x);
else
preview_set_foreground (editor, x);
break;
}
break;
default:
break;
}
return TRUE;
}
static void
preview_set_hint (GradientEditor *editor,
gint x)
{
gdouble xpos;
GimpRGB rgb;
GimpHSV hsv;
gchar *str;
xpos = control_calc_g_pos (editor, x);
gimp_gradient_get_color_at (gimp_context_get_gradient (editor->context),
xpos, &rgb);
gimp_rgb_to_hsv (&rgb, &hsv);
str = g_strdup_printf (_("Position: %0.6f "
"RGB (%0.3f, %0.3f, %0.3f) "
"HSV (%0.3f, %0.3f, %0.3f) "
"Opacity: %0.3f"),
xpos,
rgb.r,
rgb.g,
rgb.b,
hsv.h * 360.0,
hsv.s,
hsv.v,
rgb.a);
gradient_editor_set_hint (editor, str);
g_free (str);
}
static void
preview_set_foreground (GradientEditor *editor,
gint x)
{
GimpRGB color;
gdouble xpos;
gchar *str;
xpos = control_calc_g_pos (editor, x);
gimp_gradient_get_color_at (gimp_context_get_gradient (editor->context),
xpos, &color);
gimp_context_set_foreground (gimp_get_user_context (editor->context->gimp),
&color);
str = g_strdup_printf (_("Foreground color set to RGB (%d, %d, %d) <-> "
"(%0.3f, %0.3f, %0.3f)"),
(gint) (color.r * 255.0),
(gint) (color.g * 255.0),
(gint) (color.b * 255.0),
color.r, color.g, color.b);
gradient_editor_set_hint (editor, str);
g_free (str);
}
static void
preview_set_background (GradientEditor *editor,
gint x)
{
GimpRGB color;
gdouble xpos;
gchar *str;
xpos = control_calc_g_pos (editor, x);
gimp_gradient_get_color_at
(gimp_context_get_gradient (editor->context),
xpos, &color);
gimp_context_set_background (gimp_get_user_context (editor->context->gimp),
&color);
str = g_strdup_printf (_("Background color to RGB (%d, %d, %d) <-> "
"(%0.3f, %0.3f, %0.3f)"),
(gint) (color.r * 255.0),
(gint) (color.g * 255.0),
(gint) (color.b * 255.0),
color.r, color.g, color.b);
gradient_editor_set_hint (editor, str);
g_free (str);
}
/*****/
static void
preview_update (GradientEditor *editor,
gboolean recalculate)
{
glong rowsiz;
GtkAdjustment *adjustment;
guint16 width;
guint16 height;
static guint16 last_width = 0;
static guint16 last_height = 0;
if (! GTK_WIDGET_DRAWABLE (editor->preview))
return;
/* See whether we have to re-create the preview widget
* (note that the preview automatically follows the size of it's container)
*/
width = editor->preview->allocation.width;
height = editor->preview->allocation.height;
if (! editor->preview_rows[0] ||
! editor->preview_rows[1] ||
(width != last_width) ||
(height != last_height))
{
if (editor->preview_rows[0])
g_free (editor->preview_rows[0]);
if (editor->preview_rows[1])
g_free (editor->preview_rows[1]);
rowsiz = width * 3 * sizeof (guchar);
editor->preview_rows[0] = g_malloc (rowsiz);
editor->preview_rows[1] = g_malloc (rowsiz);
recalculate = TRUE; /* Force recalculation */
}
last_width = width;
last_height = height;
/* Have to redraw? */
if (recalculate)
{
adjustment = GTK_ADJUSTMENT (editor->scroll_data);
preview_fill_image (editor,
width, height,
adjustment->value,
adjustment->value + adjustment->page_size);
gtk_widget_draw (editor->preview, NULL);
}
}
static void
preview_fill_image (GradientEditor *editor,
gint width,
gint height,
gdouble left,
gdouble right)
{
GimpGradient *gradient;
guchar *p0, *p1;
gint x, y;
gdouble dx, cur_x;
GimpRGB color;
gdouble c0, c1;
gradient = gimp_context_get_gradient (editor->context);
dx = (right - left) / (width - 1);
cur_x = left;
p0 = editor->preview_rows[0];
p1 = editor->preview_rows[1];
/* Create lines to fill the image */
for (x = 0; x < width; x++)
{
gimp_gradient_get_color_at (gradient, cur_x, &color);
if ((x / GIMP_CHECK_SIZE) & 1)
{
c0 = GIMP_CHECK_LIGHT;
c1 = GIMP_CHECK_DARK;
}
else
{
c0 = GIMP_CHECK_DARK;
c1 = GIMP_CHECK_LIGHT;
}
*p0++ = (c0 + (color.r - c0) * color.a) * 255.0;
*p0++ = (c0 + (color.g - c0) * color.a) * 255.0;
*p0++ = (c0 + (color.b - c0) * color.a) * 255.0;
*p1++ = (c1 + (color.r - c1) * color.a) * 255.0;
*p1++ = (c1 + (color.g - c1) * color.a) * 255.0;
*p1++ = (c1 + (color.b - c1) * color.a) * 255.0;
cur_x += dx;
}
/* Fill image */
for (y = 0; y < height; y++)
{
if ((y / GIMP_CHECK_SIZE) & 1)
gtk_preview_draw_row (GTK_PREVIEW (editor->preview),
editor->preview_rows[1], 0, y, width);
else
gtk_preview_draw_row (GTK_PREVIEW (editor->preview),
editor->preview_rows[0], 0, y, width);
}
}
/***** Gradient control functions *****/
/* *** WARNING *** WARNING *** WARNING ***
*
* All the event-handling code for the gradient control widget is
* extremely hairy. You are not expected to understand it. If you
* find bugs, mail me unless you are very brave and you want to fix
* them yourself ;-)
*/
static gint
control_events (GtkWidget *widget,
GdkEvent *event,
GradientEditor *editor)
{
GimpGradient *gradient;
GdkEventButton *bevent;
GimpGradientSegment *seg;
gint x, y;
guint32 time;
gradient = gimp_context_get_gradient (editor->context);
switch (event->type)
{
case GDK_EXPOSE:
control_update (editor, gradient, FALSE);
break;
case GDK_LEAVE_NOTIFY:
gradient_editor_set_hint (editor, "");
break;
case GDK_BUTTON_PRESS:
if (editor->control_drag_mode == GRAD_DRAG_NONE)
{
gtk_widget_get_pointer (editor->control, &x, &y);
bevent = (GdkEventButton *) event;
editor->control_last_x = x;
editor->control_click_time = bevent->time;
control_button_press (editor,
x, y, bevent->button, bevent->state);
if (editor->control_drag_mode != GRAD_DRAG_NONE)
gtk_grab_add (widget);
}
break;
case GDK_BUTTON_RELEASE:
gradient_editor_set_hint (editor, "");
if (editor->control_drag_mode != GRAD_DRAG_NONE)
{
gtk_grab_remove (widget);
gtk_widget_get_pointer (editor->control, &x, &y);
time = ((GdkEventButton *) event)->time;
if ((time - editor->control_click_time) >= GRAD_MOVE_TIME)
{
if (! editor->instant_update)
gimp_data_dirty (GIMP_DATA (gradient));
/* Possible move */
gradient_editor_update (editor, GRAD_UPDATE_GRADIENT);
}
else if ((editor->control_drag_mode == GRAD_DRAG_MIDDLE) ||
(editor->control_drag_mode == GRAD_DRAG_ALL))
{
seg = editor->control_drag_segment;
if ((editor->control_drag_mode == GRAD_DRAG_ALL) &&
editor->control_compress)
control_extend_selection (editor, seg,
control_calc_g_pos (editor,
x));
else
control_select_single_segment (editor, seg);
gradient_editor_update (editor, GRAD_UPDATE_CONTROL);
}
editor->control_drag_mode = GRAD_DRAG_NONE;
editor->control_compress = FALSE;
control_do_hint (editor, x, y);
}
break;
case GDK_MOTION_NOTIFY:
gtk_widget_get_pointer (editor->control, &x, &y);
if (x != editor->control_last_x)
{
editor->control_last_x = x;
if (editor->control_drag_mode != GRAD_DRAG_NONE)
{
time = ((GdkEventButton *) event)->time;
if ((time - editor->control_click_time) >= GRAD_MOVE_TIME)
control_motion (editor, gradient, x);
}
else
{
gradient_editor_update (editor, GRAD_UPDATE_CONTROL);
control_do_hint (editor, x, y);
}
}
break;
default:
break;
}
return FALSE;
}
static void
control_do_hint (GradientEditor *editor,
gint x,
gint y)
{
GimpGradient *gradient;
GimpGradientSegment *seg;
GradientEditorDragMode handle;
gboolean in_handle;
double pos;
gradient = gimp_context_get_gradient (editor->context);
pos = control_calc_g_pos (editor, x);
if ((pos < 0.0) || (pos > 1.0))
return;
seg_get_closest_handle (gradient, pos, &seg, &handle);
in_handle = control_point_in_handle (editor, gradient,
x, y, seg, handle);
if (in_handle)
{
switch (handle)
{
case GRAD_DRAG_LEFT:
if (seg != NULL)
{
if (seg->prev != NULL)
gradient_editor_set_hint (editor,
_("Drag: move "
"<Shift>+Drag: move & compress"));
else
gradient_editor_set_hint (editor,
_("Click: select "
"<Shift>+Click: extend selection"));
}
else
{
gradient_editor_set_hint (editor,
_("Click: select "
"<Shift>+Click: extend selection"));
}
break;
case GRAD_DRAG_MIDDLE:
gradient_editor_set_hint (editor,
_("Click: select "
"<Shift>+Click: extend selection "
"Drag: move"));
break;
default:
g_warning ("%s: in_handle is true, but received handle type %d.",
G_STRLOC, in_handle);
break;
}
}
else
{
gradient_editor_set_hint (editor,
_("Click: select "
"<Shift>+Click: extend selection "
"Drag: move "
"<Shift>+Drag: move & compress"));
}
}
static void
control_button_press (GradientEditor *editor,
gint x,
gint y,
guint button,
guint state)
{
GimpGradient *gradient;
GimpGradientSegment *seg;
GradientEditorDragMode handle;
double xpos;
gboolean in_handle;
gradient = gimp_context_get_gradient (editor->context);
switch (button)
{
case 1:
break;
case 3:
{
GtkItemFactory *factory;
factory = gtk_item_factory_from_path ("<GradientEditor>");
gimp_item_factory_popup_with_data (factory, editor, NULL);
}
return;
/* wheelmouse support */
case 4:
{
GtkAdjustment *adj = GTK_ADJUSTMENT (editor->scroll_data);
gfloat new_value = adj->value - adj->page_increment / 2;
new_value = CLAMP (new_value, adj->lower, adj->upper - adj->page_size);
gtk_adjustment_set_value (adj, new_value);
}
return;
case 5:
{
GtkAdjustment *adj = GTK_ADJUSTMENT (editor->scroll_data);
gfloat new_value = adj->value + adj->page_increment / 2;
new_value = CLAMP (new_value, adj->lower, adj->upper - adj->page_size);
gtk_adjustment_set_value (adj, new_value);
}
return;
default:
return;
}
/* Find the closest handle */
xpos = control_calc_g_pos (editor, x);
seg_get_closest_handle (gradient, xpos, &seg, &handle);
in_handle = control_point_in_handle (editor, gradient,
x, y, seg, handle);
/* Now see what we have */
if (in_handle)
{
switch (handle)
{
case GRAD_DRAG_LEFT:
if (seg != NULL)
{
/* Left handle of some segment */
if (state & GDK_SHIFT_MASK)
{
if (seg->prev != NULL)
{
editor->control_drag_mode = GRAD_DRAG_LEFT;
editor->control_drag_segment = seg;
editor->control_compress = TRUE;
}
else
{
control_extend_selection (editor, seg, xpos);
gradient_editor_update (editor, GRAD_UPDATE_CONTROL);
}
}
else if (seg->prev != NULL)
{
editor->control_drag_mode = GRAD_DRAG_LEFT;
editor->control_drag_segment = seg;
}
else
{
control_select_single_segment (editor, seg);
gradient_editor_update (editor, GRAD_UPDATE_CONTROL);
}
return;
}
else /* seg == NULL */
{
/* Right handle of last segment */
seg = gimp_gradient_segment_get_last (gradient->segments);
if (state & GDK_SHIFT_MASK)
{
control_extend_selection (editor, seg, xpos);
gradient_editor_update (editor, GRAD_UPDATE_CONTROL);
}
else
{
control_select_single_segment (editor, seg);
gradient_editor_update (editor, GRAD_UPDATE_CONTROL);
}
return;
}
break;
case GRAD_DRAG_MIDDLE:
if (state & GDK_SHIFT_MASK)
{
control_extend_selection (editor, seg, xpos);
gradient_editor_update (editor, GRAD_UPDATE_CONTROL);
}
else
{
editor->control_drag_mode = GRAD_DRAG_MIDDLE;
editor->control_drag_segment = seg;
}
return;
default:
g_warning ("%s: in_handle is true, but received handle type %d.",
G_STRLOC, in_handle);
return;
}
}
else /* !in_handle */
{
seg = gimp_gradient_get_segment_at (gradient, xpos);
editor->control_drag_mode = GRAD_DRAG_ALL;
editor->control_drag_segment = seg;
editor->control_last_gx = xpos;
editor->control_orig_pos = xpos;
if (state & GDK_SHIFT_MASK)
editor->control_compress = TRUE;
return;
}
}
static gboolean
control_point_in_handle (GradientEditor *editor,
GimpGradient *gradient,
gint x,
gint y,
GimpGradientSegment *seg,
GradientEditorDragMode handle)
{
gint handle_pos;
switch (handle)
{
case GRAD_DRAG_LEFT:
if (seg)
{
handle_pos = control_calc_p_pos (editor, seg->left);
}
else
{
seg = gimp_gradient_segment_get_last (gradient->segments);
handle_pos = control_calc_p_pos (editor, seg->right);
}
break;
case GRAD_DRAG_MIDDLE:
handle_pos = control_calc_p_pos (editor, seg->middle);
break;
default:
g_warning ("%s: Cannot handle drag mode %d.", G_STRLOC, handle);
return FALSE;
}
y /= 2;
if ((x >= (handle_pos - y)) && (x <= (handle_pos + y)))
return TRUE;
else
return FALSE;
}
/*****/
static void
control_select_single_segment (GradientEditor *editor,
GimpGradientSegment *seg)
{
editor->control_sel_l = seg;
editor->control_sel_r = seg;
}
static void
control_extend_selection (GradientEditor *editor,
GimpGradientSegment *seg,
gdouble pos)
{
if (fabs (pos - editor->control_sel_l->left) <
fabs (pos - editor->control_sel_r->right))
editor->control_sel_l = seg;
else
editor->control_sel_r = seg;
}
/*****/
static void
control_motion (GradientEditor *editor,
GimpGradient *gradient,
gint x)
{
GimpGradientSegment *seg;
gdouble pos;
gdouble delta;
gchar *str = NULL;
seg = editor->control_drag_segment;
switch (editor->control_drag_mode)
{
case GRAD_DRAG_LEFT:
pos = control_calc_g_pos (editor, x);
if (! editor->control_compress)
seg->prev->right = seg->left = CLAMP (pos,
seg->prev->middle + EPSILON,
seg->middle - EPSILON);
else
control_compress_left (editor->control_sel_l,
editor->control_sel_r,
seg, pos);
str = g_strdup_printf (_("Handle position: %0.6f"), seg->left);
gradient_editor_set_hint (editor, str);
break;
case GRAD_DRAG_MIDDLE:
pos = control_calc_g_pos (editor, x);
seg->middle = CLAMP (pos, seg->left + EPSILON, seg->right - EPSILON);
str = g_strdup_printf (_("Handle position: %0.6f"), seg->middle);
gradient_editor_set_hint (editor, str);
break;
case GRAD_DRAG_ALL:
pos = control_calc_g_pos (editor, x);
delta = pos - editor->control_last_gx;
if ((seg->left >= editor->control_sel_l->left) &&
(seg->right <= editor->control_sel_r->right))
delta = control_move (editor,
editor->control_sel_l,
editor->control_sel_r, delta);
else
delta = control_move (editor, seg, seg, delta);
editor->control_last_gx += delta;
str = g_strdup_printf (_("Distance: %0.6f"),
editor->control_last_gx -
editor->control_orig_pos);
gradient_editor_set_hint (editor, str);
break;
default:
g_warning ("%s: Attempting to move bogus handle %d.",
G_STRLOC, editor->control_drag_mode);
break;
}
if (str)
g_free (str);
if (editor->instant_update)
{
gimp_data_dirty (GIMP_DATA (gradient));
gradient_editor_update (editor, GRAD_UPDATE_GRADIENT | GRAD_UPDATE_CONTROL);
}
else
{
gradient_editor_update (editor, GRAD_UPDATE_CONTROL);
}
}
static void
control_compress_left (GimpGradientSegment *range_l,
GimpGradientSegment *range_r,
GimpGradientSegment *drag_seg,
gdouble pos)
{
GimpGradientSegment *seg;
gdouble lbound, rbound;
gint k;
/* Check what we have to compress */
if (!((drag_seg->left >= range_l->left) &&
((drag_seg->right <= range_r->right) || (drag_seg == range_r->next))))
{
/* We are compressing a segment outside the selection */
range_l = range_r = drag_seg;
}
/* Calculate left bound for dragged hadle */
if (drag_seg == range_l)
lbound = range_l->prev->left + 2.0 * EPSILON;
else
{
/* Count number of segments to the left of the dragged handle */
seg = drag_seg;
k = 0;
while (seg != range_l)
{
k++;
seg = seg->prev;
}
/* 2*k handles have to fit */
lbound = range_l->left + 2.0 * k * EPSILON;
}
/* Calculate right bound for dragged handle */
if (drag_seg == range_r->next)
rbound = range_r->next->right - 2.0 * EPSILON;
else
{
/* Count number of segments to the right of the dragged handle */
seg = drag_seg;
k = 1;
while (seg != range_r)
{
k++;
seg = seg->next;
}
/* 2*k handles have to fit */
rbound = range_r->right - 2.0 * k * EPSILON;
}
/* Calculate position */
pos = CLAMP (pos, lbound, rbound);
/* Compress segments to the left of the handle */
if (drag_seg == range_l)
control_compress_range (range_l->prev, range_l->prev,
range_l->prev->left, pos);
else
control_compress_range (range_l, drag_seg->prev, range_l->left, pos);
/* Compress segments to the right of the handle */
if (drag_seg != range_r->next)
control_compress_range (drag_seg, range_r, pos, range_r->right);
else
control_compress_range (drag_seg, drag_seg, pos, drag_seg->right);
}
static void
control_compress_range (GimpGradientSegment *range_l,
GimpGradientSegment *range_r,
gdouble new_l,
gdouble new_r)
{
gdouble orig_l, orig_r;
gdouble scale;
GimpGradientSegment *seg, *aseg;
orig_l = range_l->left;
orig_r = range_r->right;
scale = (new_r - new_l) / (orig_r - orig_l);
seg = range_l;
do
{
seg->left = new_l + (seg->left - orig_l) * scale;
seg->middle = new_l + (seg->middle - orig_l) * scale;
seg->right = new_l + (seg->right - orig_l) * scale;
/* Next */
aseg = seg;
seg = seg->next;
}
while (aseg != range_r);
}
/*****/
static gdouble
control_move (GradientEditor *editor,
GimpGradientSegment *range_l,
GimpGradientSegment *range_r,
gdouble delta)
{
gdouble lbound, rbound;
gint is_first, is_last;
GimpGradientSegment *seg, *aseg;
/* First or last segments in gradient? */
is_first = (range_l->prev == NULL);
is_last = (range_r->next == NULL);
/* Calculate drag bounds */
if (! editor->control_compress)
{
if (!is_first)
lbound = range_l->prev->middle + EPSILON;
else
lbound = range_l->left + EPSILON;
if (!is_last)
rbound = range_r->next->middle - EPSILON;
else
rbound = range_r->right - EPSILON;
}
else
{
if (!is_first)
lbound = range_l->prev->left + 2.0 * EPSILON;
else
lbound = range_l->left + EPSILON;
if (!is_last)
rbound = range_r->next->right - 2.0 * EPSILON;
else
rbound = range_r->right - EPSILON;
}
/* Fix the delta if necessary */
if (delta < 0.0)
{
if (!is_first)
{
if (range_l->left + delta < lbound)
delta = lbound - range_l->left;
}
else
if (range_l->middle + delta < lbound)
delta = lbound - range_l->middle;
}
else
{
if (!is_last)
{
if (range_r->right + delta > rbound)
delta = rbound - range_r->right;
}
else
if (range_r->middle + delta > rbound)
delta = rbound - range_r->middle;
}
/* Move all the segments inside the range */
seg = range_l;
do
{
if (!((seg == range_l) && is_first))
seg->left += delta;
seg->middle += delta;
if (!((seg == range_r) && is_last))
seg->right += delta;
/* Next */
aseg = seg;
seg = seg->next;
}
while (aseg != range_r);
/* Fix the segments that surround the range */
if (!is_first)
{
if (! editor->control_compress)
range_l->prev->right = range_l->left;
else
control_compress_range (range_l->prev, range_l->prev,
range_l->prev->left, range_l->left);
}
if (!is_last)
{
if (! editor->control_compress)
range_r->next->left = range_r->right;
else
control_compress_range (range_r->next, range_r->next,
range_r->right, range_r->next->right);
}
return delta;
}
/*****/
static void
control_update (GradientEditor *editor,
GimpGradient *gradient,
gboolean recalculate)
{
GtkAdjustment *adjustment;
gint cwidth, cheight;
gint pwidth, pheight;
if (! GTK_WIDGET_DRAWABLE (editor->control))
return;
/* See whether we have to re-create the control pixmap
* depending on the preview's width
*/
cwidth = editor->preview->allocation.width;
cheight = GRAD_CONTROL_HEIGHT;
if (editor->control_pixmap)
gdk_drawable_get_size (editor->control_pixmap, &pwidth, &pheight);
if (! editor->control_pixmap ||
(cwidth != pwidth) ||
(cheight != pheight))
{
if (editor->control_pixmap)
g_object_unref (editor->control_pixmap);
editor->control_pixmap =
gdk_pixmap_new (editor->control->window, cwidth, cheight, -1);
recalculate = TRUE;
}
/* Avaoid segfault on first invocation */
if (cwidth < GRAD_PREVIEW_WIDTH)
return;
/* Have to reset the selection? */
if (recalculate)
control_select_single_segment (editor, gradient->segments);
/* Redraw pixmap */
adjustment = GTK_ADJUSTMENT (editor->scroll_data);
control_draw (editor,
gradient,
editor->control_pixmap,
cwidth, cheight,
adjustment->value,
adjustment->value + adjustment->page_size);
gdk_draw_drawable (editor->control->window,
editor->control->style->black_gc,
editor->control_pixmap,
0, 0, 0, 0,
cwidth, cheight);
}
static void
control_draw (GradientEditor *editor,
GimpGradient *gradient,
GdkPixmap *pixmap,
gint width,
gint height,
gdouble left,
gdouble right)
{
gint sel_l, sel_r;
gdouble g_pos;
GimpGradientSegment *seg;
GradientEditorDragMode handle;
/* Clear the pixmap */
gdk_draw_rectangle (pixmap, editor->control->style->bg_gc[GTK_STATE_NORMAL],
TRUE, 0, 0, width, height);
/* Draw selection */
sel_l = control_calc_p_pos (editor,
editor->control_sel_l->left);
sel_r = control_calc_p_pos (editor,
editor->control_sel_r->right);
gdk_draw_rectangle (pixmap,
editor->control->style->dark_gc[GTK_STATE_NORMAL],
TRUE, sel_l, 0, sel_r - sel_l + 1, height);
/* Draw handles */
seg = gradient->segments;
while (seg)
{
control_draw_normal_handle (editor, pixmap, seg->left, height);
control_draw_middle_handle (editor, pixmap, seg->middle, height);
/* Draw right handle only if this is the last segment */
if (seg->next == NULL)
control_draw_normal_handle (editor, pixmap, seg->right, height);
/* Next! */
seg = seg->next;
}
/* Draw the handle which is closest to the mouse position */
g_pos = control_calc_g_pos (editor, editor->control_last_x);
seg_get_closest_handle (gradient, CLAMP (g_pos, 0.0, 1.0), &seg, &handle);
switch (handle)
{
case GRAD_DRAG_LEFT:
if (seg)
{
control_draw_normal_handle (editor, pixmap,
seg->left, height);
}
else
{
seg = gimp_gradient_segment_get_last (gradient->segments);
control_draw_normal_handle (editor, pixmap,
seg->right, height);
}
break;
case GRAD_DRAG_MIDDLE:
control_draw_middle_handle (editor, pixmap, seg->middle, height);
break;
default:
break;
}
}
static void
control_draw_normal_handle (GradientEditor *editor,
GdkPixmap *pixmap,
gdouble pos,
gint height)
{
control_draw_handle (pixmap,
editor->control->style->black_gc,
editor->control->style->black_gc,
control_calc_p_pos (editor, pos), height);
}
static void
control_draw_middle_handle (GradientEditor *editor,
GdkPixmap *pixmap,
gdouble pos,
gint height)
{
control_draw_handle (pixmap,
editor->control->style->black_gc,
editor->control->style->bg_gc[GTK_STATE_PRELIGHT],
control_calc_p_pos (editor, pos), height);
}
static void
control_draw_handle (GdkPixmap *pixmap,
GdkGC *border_gc,
GdkGC *fill_gc,
gint xpos,
gint height)
{
gint y;
gint left, right, bottom;
for (y = 0; y < height; y++)
gdk_draw_line (pixmap, fill_gc, xpos - y / 2, y, xpos + y / 2, y);
bottom = height - 1;
left = xpos - bottom / 2;
right = xpos + bottom / 2;
gdk_draw_line (pixmap, border_gc, xpos, 0, left, bottom);
gdk_draw_line (pixmap, border_gc, xpos, 0, right, bottom);
gdk_draw_line (pixmap, border_gc, left, bottom, right, bottom);
}
/*****/
static gint
control_calc_p_pos (GradientEditor *editor,
gdouble pos)
{
gint pwidth, pheight;
GtkAdjustment *adjustment;
/* Calculate the position (in widget's coordinates) of the
* requested point from the gradient. Rounding is done to
* minimize mismatches between the rendered gradient preview
* and the gradient control's handles.
*/
adjustment = GTK_ADJUSTMENT (editor->scroll_data);
gdk_drawable_get_size (editor->control_pixmap, &pwidth, &pheight);
return RINT ((pwidth - 1) * (pos - adjustment->value) / adjustment->page_size);
}
static gdouble
control_calc_g_pos (GradientEditor *editor,
gint pos)
{
gint pwidth, pheight;
GtkAdjustment *adjustment;
/* Calculate the gradient position that corresponds to widget's coordinates */
adjustment = GTK_ADJUSTMENT (editor->scroll_data);
gdk_drawable_get_size (editor->control_pixmap, &pwidth, &pheight);
return adjustment->page_size * pos / (pwidth - 1) + adjustment->value;
}
/***** Segment functions *****/
static void
seg_get_closest_handle (GimpGradient *grad,
gdouble pos,
GimpGradientSegment **seg,
GradientEditorDragMode *handle)
{
gdouble l_delta, m_delta, r_delta;
*seg = gimp_gradient_get_segment_at (grad, pos);
m_delta = fabs (pos - (*seg)->middle);
if (pos < (*seg)->middle)
{
l_delta = fabs (pos - (*seg)->left);
if (l_delta < m_delta)
*handle = GRAD_DRAG_LEFT;
else
*handle = GRAD_DRAG_MIDDLE;
}
else
{
r_delta = fabs (pos - (*seg)->right);
if (m_delta < r_delta)
{
*handle = GRAD_DRAG_MIDDLE;
}
else
{
*seg = (*seg)->next;
*handle = GRAD_DRAG_LEFT;
}
}
}
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