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gimp/app/tools/gimpcurvestool.c

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/* The GIMP -- an 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 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 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gtk/gtk.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "tools-types.h"
#include "config/gimpguiconfig.h"
#include "base/curves.h"
#include "base/gimphistogram.h"
#include "base/gimplut.h"
#include "core/gimp.h"
#include "core/gimpdrawable.h"
#include "core/gimpdrawable-histogram.h"
#include "core/gimpimage.h"
#include "core/gimpimagemap.h"
#include "core/gimptoolinfo.h"
#include "widgets/gimpcolorbar.h"
#include "widgets/gimpcursor.h"
#include "widgets/gimphelp-ids.h"
#include "widgets/gimphistogramview.h"
#include "display/gimpdisplay.h"
#include "gimpcurvestool.h"
#include "gimphistogramoptions.h"
#include "gimptoolcontrol.h"
#include "gimp-intl.h"
#define XRANGE (1 << 0)
#define YRANGE (1 << 1)
#define GRAPH (1 << 2)
#define ALL (XRANGE | YRANGE | GRAPH)
#define GRAPH_SIZE 256
#define BAR_SIZE 12
#define RADIUS 3
#define MIN_DISTANCE 8
/* local function prototypes */
static void gimp_curves_tool_class_init (GimpCurvesToolClass *klass);
static void gimp_curves_tool_init (GimpCurvesTool *tool);
static void gimp_curves_tool_finalize (GObject *object);
static gboolean gimp_curves_tool_initialize (GimpTool *tool,
GimpDisplay *gdisp);
static void gimp_curves_tool_button_release (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *gdisp);
static void gimp_curves_tool_color_picked (GimpColorTool *color_tool,
GimpColorPickState pick_state,
GimpImageType sample_type,
GimpRGB *color,
gint color_index);
static void gimp_curves_tool_map (GimpImageMapTool *image_map_tool);
static void gimp_curves_tool_dialog (GimpImageMapTool *image_map_tool);
static void gimp_curves_tool_reset (GimpImageMapTool *image_map_tool);
static gboolean gimp_curves_tool_settings_load (GimpImageMapTool *image_map_tool,
gpointer fp);
static gboolean gimp_curves_tool_settings_save (GimpImageMapTool *image_map_tool,
gpointer fp);
static void curves_add_point (GimpCurvesTool *tool,
gint cchan);
static void curves_update (GimpCurvesTool *tool,
gint update);
static void curves_channel_callback (GtkWidget *widget,
GimpCurvesTool *tool);
static void curves_channel_reset_callback (GtkWidget *widget,
GimpCurvesTool *tool);
static gboolean curves_menu_sensitivity (gint value,
gpointer data);
static void curves_curve_type_callback (GtkWidget *widget,
GimpCurvesTool *tool);
static gboolean curves_graph_events (GtkWidget *widget,
GdkEvent *event,
GimpCurvesTool *tool);
static gboolean curves_graph_expose (GtkWidget *widget,
GdkEventExpose *eevent,
GimpCurvesTool *tool);
static GimpImageMapToolClass *parent_class = NULL;
/* public functions */
void
gimp_curves_tool_register (GimpToolRegisterCallback callback,
gpointer data)
{
(* callback) (GIMP_TYPE_CURVES_TOOL,
GIMP_TYPE_HISTOGRAM_OPTIONS,
gimp_color_options_gui,
0,
"gimp-curves-tool",
_("Curves"),
_("Adjust color curves"),
N_("_Curves..."), NULL,
NULL, GIMP_HELP_TOOL_CURVES,
GIMP_STOCK_TOOL_CURVES,
data);
}
GType
gimp_curves_tool_get_type (void)
{
static GType tool_type = 0;
if (! tool_type)
{
static const GTypeInfo tool_info =
{
sizeof (GimpCurvesToolClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_curves_tool_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpCurvesTool),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_curves_tool_init,
};
tool_type = g_type_register_static (GIMP_TYPE_IMAGE_MAP_TOOL,
"GimpCurvesTool",
&tool_info, 0);
}
return tool_type;
}
/* private functions */
static void
gimp_curves_tool_class_init (GimpCurvesToolClass *klass)
{
GObjectClass *object_class;
GimpToolClass *tool_class;
GimpColorToolClass *color_tool_class;
GimpImageMapToolClass *image_map_tool_class;
object_class = G_OBJECT_CLASS (klass);
tool_class = GIMP_TOOL_CLASS (klass);
color_tool_class = GIMP_COLOR_TOOL_CLASS (klass);
image_map_tool_class = GIMP_IMAGE_MAP_TOOL_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
object_class->finalize = gimp_curves_tool_finalize;
tool_class->initialize = gimp_curves_tool_initialize;
tool_class->button_release = gimp_curves_tool_button_release;
color_tool_class->picked = gimp_curves_tool_color_picked;
image_map_tool_class->shell_desc = _("Adjust Color Curves");
image_map_tool_class->settings_name = "curves";
image_map_tool_class->load_dialog_title = _("Load Curves");
image_map_tool_class->load_button_tip = _("Load curves settings from file");
image_map_tool_class->save_dialog_title = _("Save Curves");
image_map_tool_class->save_button_tip = _("Save curves settings to file");
image_map_tool_class->map = gimp_curves_tool_map;
image_map_tool_class->dialog = gimp_curves_tool_dialog;
image_map_tool_class->reset = gimp_curves_tool_reset;
image_map_tool_class->settings_load = gimp_curves_tool_settings_load;
image_map_tool_class->settings_save = gimp_curves_tool_settings_save;
}
static void
gimp_curves_tool_init (GimpCurvesTool *tool)
{
gint i;
tool->curves = g_new0 (Curves, 1);
tool->lut = gimp_lut_new ();
tool->channel = GIMP_HISTOGRAM_VALUE;
curves_init (tool->curves);
for (i = 0; i < G_N_ELEMENTS (tool->col_value); i++)
tool->col_value[i] = -1;
tool->cursor_x = -1;
tool->cursor_y = -1;
}
static void
gimp_curves_tool_finalize (GObject *object)
{
GimpCurvesTool *tool = GIMP_CURVES_TOOL (object);
if (tool->curves)
{
g_free (tool->curves);
tool->curves = NULL;
}
if (tool->lut)
{
gimp_lut_free (tool->lut);
tool->lut = NULL;
}
if (tool->hist)
{
gimp_histogram_free (tool->hist);
tool->hist = NULL;
}
if (tool->cursor_layout)
{
g_object_unref (tool->cursor_layout);
tool->cursor_layout = NULL;
}
if (tool->xpos_layout)
{
g_object_unref (tool->xpos_layout);
tool->xpos_layout = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gimp_curves_tool_initialize (GimpTool *tool,
GimpDisplay *gdisp)
{
GimpCurvesTool *c_tool = GIMP_CURVES_TOOL (tool);
GimpDrawable *drawable;
drawable = gimp_image_active_drawable (gdisp->gimage);
if (! drawable)
return FALSE;
if (gimp_drawable_is_indexed (drawable))
{
g_message (_("Curves for indexed layers cannot be adjusted."));
return FALSE;
}
if (! c_tool->hist)
c_tool->hist = gimp_histogram_new ();
curves_init (c_tool->curves);
c_tool->channel = GIMP_HISTOGRAM_VALUE;
c_tool->color = gimp_drawable_is_rgb (drawable);
c_tool->alpha = gimp_drawable_has_alpha (drawable);
c_tool->grab_point = -1;
c_tool->last = 0;
GIMP_TOOL_CLASS (parent_class)->initialize (tool, gdisp);
/* always pick colors */
gimp_color_tool_enable (GIMP_COLOR_TOOL (tool),
GIMP_COLOR_OPTIONS (tool->tool_info->tool_options));
gimp_int_combo_box_set_sensitivity (GIMP_INT_COMBO_BOX (c_tool->channel_menu),
curves_menu_sensitivity, c_tool, NULL);
gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (c_tool->channel_menu),
c_tool->channel);
/* FIXME: hack */
if (! c_tool->color)
c_tool->channel = (c_tool->channel == GIMP_HISTOGRAM_ALPHA) ? 1 : 0;
gimp_drawable_calculate_histogram (drawable, c_tool->hist);
gimp_histogram_view_set_histogram (GIMP_HISTOGRAM_VIEW (c_tool->graph),
c_tool->hist);
curves_update (c_tool, ALL);
return TRUE;
}
static void
gimp_curves_tool_button_release (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *gdisp)
{
GimpCurvesTool *c_tool = GIMP_CURVES_TOOL (tool);
GimpDrawable *drawable;
drawable = gimp_image_active_drawable (gdisp->gimage);
if (state & GDK_SHIFT_MASK)
{
curves_add_point (c_tool, c_tool->channel);
curves_calculate_curve (c_tool->curves, c_tool->channel);
curves_update (c_tool, GRAPH | XRANGE);
}
else if (state & GDK_CONTROL_MASK)
{
gint i;
for (i = 0; i < 5; i++)
{
curves_add_point (c_tool, i);
curves_calculate_curve (c_tool->curves, c_tool->channel);
}
curves_update (c_tool, GRAPH | XRANGE);
}
/* chain up to halt the tool */
GIMP_TOOL_CLASS (parent_class)->button_release (tool,
coords, time, state, gdisp);
}
static void
gimp_curves_tool_color_picked (GimpColorTool *color_tool,
GimpColorPickState pick_state,
GimpImageType sample_type,
GimpRGB *color,
gint color_index)
{
GimpCurvesTool *tool = GIMP_CURVES_TOOL (color_tool);
GimpDrawable *drawable;
guchar r, g, b, a;
drawable = GIMP_IMAGE_MAP_TOOL (tool)->drawable;
gimp_rgba_get_uchar (color, &r, &g, &b, &a);
tool->col_value[GIMP_HISTOGRAM_RED] = r;
tool->col_value[GIMP_HISTOGRAM_GREEN] = g;
tool->col_value[GIMP_HISTOGRAM_BLUE] = b;
if (gimp_drawable_has_alpha (drawable))
tool->col_value[GIMP_HISTOGRAM_ALPHA] = a;
if (gimp_drawable_is_indexed (drawable))
tool->col_value[GIMP_HISTOGRAM_ALPHA] = color_index;
tool->col_value[GIMP_HISTOGRAM_VALUE] = MAX (MAX (r, g), b);
curves_update (tool, GRAPH);
}
static void
curves_add_point (GimpCurvesTool *tool,
gint cchan)
{
/* Add point onto the curve */
gint closest_point = 0;
gint distance;
gint curvex;
gint i;
switch (tool->curves->curve_type[cchan])
{
case GIMP_CURVE_SMOOTH:
curvex = tool->col_value[cchan];
distance = G_MAXINT;
for (i = 0; i < CURVES_NUM_POINTS; i++)
{
if (tool->curves->points[cchan][i][0] != -1)
if (abs (curvex - tool->curves->points[cchan][i][0]) < distance)
{
distance = abs (curvex - tool->curves->points[cchan][i][0]);
closest_point = i;
}
}
if (distance > MIN_DISTANCE)
closest_point = (curvex + 8) / 16;
tool->curves->points[cchan][closest_point][0] = curvex;
tool->curves->points[cchan][closest_point][1] = tool->curves->curve[cchan][curvex];
break;
case GIMP_CURVE_FREE:
/* do nothing for free form curves */
break;
}
}
static void
gimp_curves_tool_map (GimpImageMapTool *image_map_tool)
{
GimpCurvesTool *tool = GIMP_CURVES_TOOL (image_map_tool);
gimp_lut_setup (tool->lut,
(GimpLutFunc) curves_lut_func,
tool->curves,
gimp_drawable_bytes (image_map_tool->drawable));
gimp_image_map_apply (image_map_tool->image_map,
(GimpImageMapApplyFunc) gimp_lut_process,
tool->lut);
}
/*******************/
/* Curves dialog */
/*******************/
static void
gimp_curves_tool_dialog (GimpImageMapTool *image_map_tool)
{
GimpCurvesTool *tool = GIMP_CURVES_TOOL (image_map_tool);
GimpToolOptions *tool_options;
GtkListStore *store;
GtkWidget *vbox;
GtkWidget *vbox2;
GtkWidget *hbox;
GtkWidget *hbox2;
GtkWidget *label;
GtkWidget *bbox;
GtkWidget *frame;
GtkWidget *menu;
GtkWidget *table;
GtkWidget *button;
GtkWidget *bar;
gint padding;
tool_options = GIMP_TOOL (tool)->tool_info->tool_options;
vbox = image_map_tool->main_vbox;
/* The option menu for selecting channels */
hbox = gtk_hbox_new (FALSE, 6);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
label = gtk_label_new_with_mnemonic (_("Cha_nnel:"));
gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
store = gimp_enum_store_new_with_range (GIMP_TYPE_HISTOGRAM_CHANNEL,
GIMP_HISTOGRAM_VALUE,
GIMP_HISTOGRAM_ALPHA);
menu = g_object_new (GIMP_TYPE_ENUM_COMBO_BOX,
"model", store,
NULL);
g_object_unref (store);
g_signal_connect (menu, "changed",
G_CALLBACK (curves_channel_callback),
tool);
gimp_enum_combo_box_set_stock_prefix (GIMP_ENUM_COMBO_BOX (menu),
"gimp-channel");
gtk_box_pack_start (GTK_BOX (hbox), menu, FALSE, FALSE, 0);
gtk_widget_show (menu);
tool->channel_menu = menu;
gtk_label_set_mnemonic_widget (GTK_LABEL (label), menu);
button = gtk_button_new_with_mnemonic (_("R_eset channel"));
gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE, 0);
gtk_widget_show (button);
g_signal_connect (button, "clicked",
G_CALLBACK (curves_channel_reset_callback),
tool);
menu = gimp_prop_enum_stock_box_new (G_OBJECT (tool_options),
"histogram-scale", "gimp-histogram",
0, 0);
gtk_box_pack_end (GTK_BOX (hbox), menu, FALSE, FALSE, 0);
gtk_widget_show (menu);
/* The table for the color bars and the graph */
table = gtk_table_new (2, 2, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 2);
gtk_table_set_row_spacings (GTK_TABLE (table), 2);
gtk_box_pack_start (GTK_BOX (vbox), table, TRUE, TRUE, 0);
/* The left color bar */
vbox2 = gtk_vbox_new (FALSE, 0);
gtk_table_attach (GTK_TABLE (table), vbox2, 0, 1, 0, 1,
GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);
gtk_widget_show (vbox2);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (vbox2), frame, TRUE, TRUE, RADIUS);
gtk_widget_show (frame);
tool->yrange = gimp_color_bar_new (GTK_ORIENTATION_VERTICAL);
gtk_widget_set_size_request (tool->yrange, BAR_SIZE, -1);
gtk_container_add (GTK_CONTAINER (frame), tool->yrange);
gtk_widget_show (tool->yrange);
/* The curves graph */
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_table_attach (GTK_TABLE (table), frame, 1, 2, 0, 1,
GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);
gtk_widget_show (frame);
tool->graph = gimp_histogram_view_new (FALSE);
gtk_widget_set_size_request (tool->graph,
GRAPH_SIZE + RADIUS * 2,
GRAPH_SIZE + RADIUS * 2);
gtk_widget_add_events (tool->graph, (GDK_BUTTON_PRESS_MASK |
GDK_BUTTON_RELEASE_MASK |
GDK_POINTER_MOTION_MASK |
GDK_LEAVE_NOTIFY_MASK));
g_object_set (tool->graph,
"border-width", RADIUS,
"subdivisions", 1,
NULL);
GIMP_HISTOGRAM_VIEW (tool->graph)->light_histogram = TRUE;
gtk_container_add (GTK_CONTAINER (frame), tool->graph);
gtk_widget_show (tool->graph);
g_signal_connect (tool->graph, "event",
G_CALLBACK (curves_graph_events),
tool);
g_signal_connect_after (tool->graph, "expose_event",
G_CALLBACK (curves_graph_expose),
tool);
gimp_histogram_options_connect_view (GIMP_HISTOGRAM_OPTIONS (tool_options),
GIMP_HISTOGRAM_VIEW (tool->graph));
/* The bottom color bar */
hbox2 = gtk_hbox_new (FALSE, 0);
gtk_table_attach (GTK_TABLE (table), hbox2, 1, 2, 1, 2,
GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
gtk_widget_show (hbox2);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (hbox2), frame, TRUE, TRUE, RADIUS);
gtk_widget_show (frame);
vbox2 = gtk_vbox_new (TRUE, 0);
gtk_container_add (GTK_CONTAINER (frame), vbox2);
gtk_widget_show (vbox2);
tool->xrange = gimp_color_bar_new (GTK_ORIENTATION_HORIZONTAL);
gtk_widget_set_size_request (tool->xrange, -1, BAR_SIZE / 2);
gtk_box_pack_start (GTK_BOX (vbox2), tool->xrange, TRUE, TRUE, 0);
gtk_widget_show (tool->xrange);
bar = gimp_color_bar_new (GTK_ORIENTATION_HORIZONTAL);
gtk_box_pack_start (GTK_BOX (vbox2), bar, TRUE, TRUE, 0);
gtk_widget_show (bar);
gtk_widget_show (table);
hbox = gtk_hbox_new (FALSE, 6);
gtk_box_pack_end (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
/* Horizontal button box for load / save */
frame = gimp_frame_new (_("All Channels"));
gtk_box_pack_start (GTK_BOX (hbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
bbox = gtk_hbutton_box_new ();
gtk_box_set_spacing (GTK_BOX (bbox), 4);
gtk_container_add (GTK_CONTAINER (frame), bbox);
gtk_widget_show (bbox);
gtk_box_pack_start (GTK_BOX (bbox), image_map_tool->load_button,
FALSE, FALSE, 0);
gtk_widget_show (image_map_tool->load_button);
gtk_box_pack_start (GTK_BOX (bbox), image_map_tool->save_button,
FALSE, FALSE, 0);
gtk_widget_show (image_map_tool->save_button);
/* The radio box for selecting the curve type */
frame = gimp_frame_new (_("Curve Type"));
gtk_box_pack_end (GTK_BOX (hbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
hbox = gimp_enum_stock_box_new (GIMP_TYPE_CURVE_TYPE,
"gimp-curve", GTK_ICON_SIZE_MENU,
G_CALLBACK (curves_curve_type_callback),
tool,
&tool->curve_type);
gtk_widget_style_get (bbox, "child_internal_pad_x", &padding, NULL);
gimp_enum_stock_box_set_child_padding (hbox, padding, -1);
gtk_container_set_border_width (GTK_CONTAINER (hbox), 2);
gtk_box_set_spacing (GTK_BOX (hbox), 4);
gtk_container_add (GTK_CONTAINER (frame), hbox);
gtk_widget_show (hbox);
}
static void
gimp_curves_tool_reset (GimpImageMapTool *image_map_tool)
{
GimpCurvesTool *tool = GIMP_CURVES_TOOL (image_map_tool);
GimpHistogramChannel channel;
tool->grab_point = -1;
for (channel = GIMP_HISTOGRAM_VALUE;
channel <= GIMP_HISTOGRAM_ALPHA;
channel++)
curves_channel_reset (tool->curves, channel);
curves_update (tool, XRANGE | GRAPH);
}
static gboolean
gimp_curves_tool_settings_load (GimpImageMapTool *image_map_tool,
gpointer fp)
{
GimpCurvesTool *tool = GIMP_CURVES_TOOL (image_map_tool);
FILE *file = fp;
gint i, j;
gint fields;
gchar buf[50];
gint index[5][CURVES_NUM_POINTS];
gint value[5][CURVES_NUM_POINTS];
if (! fgets (buf, sizeof (buf), file))
return FALSE;
if (strcmp (buf, "# GIMP Curves File\n") != 0)
return FALSE;
for (i = 0; i < 5; i++)
{
for (j = 0; j < CURVES_NUM_POINTS; j++)
{
fields = fscanf (file, "%d %d ", &index[i][j], &value[i][j]);
if (fields != 2)
{
/* FIXME: should have a helpful error message here */
g_printerr ("fields != 2");
return FALSE;
}
}
}
for (i = 0; i < 5; i++)
{
tool->curves->curve_type[i] = GIMP_CURVE_SMOOTH;
for (j = 0; j < CURVES_NUM_POINTS; j++)
{
tool->curves->points[i][j][0] = index[i][j];
tool->curves->points[i][j][1] = value[i][j];
}
}
for (i = 0; i < 5; i++)
curves_calculate_curve (tool->curves, i);
curves_update (tool, ALL);
gimp_int_radio_group_set_active (GTK_RADIO_BUTTON (tool->curve_type),
GIMP_CURVE_SMOOTH);
return TRUE;
}
static gboolean
gimp_curves_tool_settings_save (GimpImageMapTool *image_map_tool,
gpointer fp)
{
GimpCurvesTool *tool = GIMP_CURVES_TOOL (image_map_tool);
FILE *file = fp;
gint i, j;
gint32 index;
for (i = 0; i < 5; i++)
if (tool->curves->curve_type[i] == GIMP_CURVE_FREE)
{
/* pick representative points from the curve
and make them control points */
for (j = 0; j <= 8; j++)
{
index = CLAMP0255 (j * 32);
tool->curves->points[i][j * 2][0] = index;
tool->curves->points[i][j * 2][1] = tool->curves->curve[i][index];
}
}
fprintf (file, "# GIMP Curves File\n");
for (i = 0; i < 5; i++)
{
for (j = 0; j < CURVES_NUM_POINTS; j++)
fprintf (file, "%d %d ",
tool->curves->points[i][j][0],
tool->curves->points[i][j][1]);
fprintf (file, "\n");
}
return TRUE;
}
/* TODO: preview alpha channel stuff correctly. -- austin, 20/May/99 */
static void
curves_update (GimpCurvesTool *tool,
gint update)
{
GimpHistogramChannel channel;
if (tool->color)
{
channel = tool->channel;
}
else
{
/* FIXME: hack */
if (tool->channel == 1)
channel = GIMP_HISTOGRAM_ALPHA;
else
channel = GIMP_HISTOGRAM_VALUE;
}
if (update & GRAPH)
gtk_widget_queue_draw (tool->graph);
if (update & XRANGE)
{
switch (channel)
{
case GIMP_HISTOGRAM_VALUE:
case GIMP_HISTOGRAM_ALPHA:
case GIMP_HISTOGRAM_RGB:
gimp_color_bar_set_buffers (GIMP_COLOR_BAR (tool->xrange),
tool->curves->curve[tool->channel],
tool->curves->curve[tool->channel],
tool->curves->curve[tool->channel]);
break;
case GIMP_HISTOGRAM_RED:
case GIMP_HISTOGRAM_GREEN:
case GIMP_HISTOGRAM_BLUE:
gimp_color_bar_set_buffers (GIMP_COLOR_BAR (tool->xrange),
tool->curves->curve[GIMP_HISTOGRAM_RED],
tool->curves->curve[GIMP_HISTOGRAM_GREEN],
tool->curves->curve[GIMP_HISTOGRAM_BLUE]);
break;
}
}
if (update & YRANGE)
{
gimp_color_bar_set_channel (GIMP_COLOR_BAR (tool->yrange), channel);
}
}
static void
curves_channel_callback (GtkWidget *widget,
GimpCurvesTool *tool)
{
gimp_int_combo_box_get_active (GIMP_INT_COMBO_BOX (widget),
(gint *) &tool->channel);
gimp_histogram_view_set_channel (GIMP_HISTOGRAM_VIEW (tool->graph),
tool->channel);
/* FIXME: hack */
if (! tool->color)
tool->channel = (tool->channel == GIMP_HISTOGRAM_ALPHA) ? 1 : 0;
gimp_int_radio_group_set_active (GTK_RADIO_BUTTON (tool->curve_type),
tool->curves->curve_type[tool->channel]);
curves_update (tool, ALL);
}
static void
curves_channel_reset_callback (GtkWidget *widget,
GimpCurvesTool *tool)
{
tool->grab_point = -1;
curves_channel_reset (tool->curves, tool->channel);
curves_update (tool, XRANGE | GRAPH);
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (tool));
}
static gboolean
curves_menu_sensitivity (gint value,
gpointer data)
{
GimpCurvesTool *tool = GIMP_CURVES_TOOL (data);
GimpHistogramChannel channel = value;
switch (channel)
{
case GIMP_HISTOGRAM_VALUE:
return TRUE;
case GIMP_HISTOGRAM_RED:
case GIMP_HISTOGRAM_GREEN:
case GIMP_HISTOGRAM_BLUE:
return tool->color;
case GIMP_HISTOGRAM_ALPHA:
return tool->alpha;
case GIMP_HISTOGRAM_RGB:
return FALSE;
}
return FALSE;
}
static void
curves_curve_type_callback (GtkWidget *widget,
GimpCurvesTool *tool)
{
GimpCurveType curve_type;
gimp_radio_button_update (widget, &curve_type);
if (tool->curves->curve_type[tool->channel] != curve_type)
{
tool->curves->curve_type[tool->channel] = curve_type;
if (curve_type == GIMP_CURVE_SMOOTH)
{
gint i;
gint32 index;
/* pick representative points from the curve
* and make them control points
*/
for (i = 0; i <= 8; i++)
{
index = CLAMP0255 (i * 32);
tool->curves->points[tool->channel][i * 2][0] = index;
tool->curves->points[tool->channel][i * 2][1] = tool->curves->curve[tool->channel][index];
}
}
curves_calculate_curve (tool->curves, tool->channel);
curves_update (tool, XRANGE | GRAPH);
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (tool));
}
}
static gboolean
curves_graph_events (GtkWidget *widget,
GdkEvent *event,
GimpCurvesTool *tool)
{
static GimpCursorType cursor_type = GDK_TOP_LEFT_ARROW;
GimpCursorType new_cursor = GDK_X_CURSOR;
GdkEventButton *bevent;
GdkEventMotion *mevent;
gint i;
gint tx, ty;
gint x, y;
gint width, height;
gint closest_point;
gint distance;
gint x1, x2, y1, y2;
width = widget->allocation.width - 2 * RADIUS;
height = widget->allocation.height - 2 * RADIUS;
/* get the pointer position */
gdk_window_get_pointer (tool->graph->window, &tx, &ty, NULL);
x = ROUND (((gdouble) (tx - RADIUS) / (gdouble) width) * 255.0);
y = ROUND (((gdouble) (ty - RADIUS) / (gdouble) height) * 255.0);
x = CLAMP0255 (x);
y = CLAMP0255 (y);
distance = G_MAXINT;
for (i = 0, closest_point = 0; i < CURVES_NUM_POINTS; i++)
{
if (tool->curves->points[tool->channel][i][0] != -1)
if (abs (x - tool->curves->points[tool->channel][i][0]) < distance)
{
distance = abs (x - tool->curves->points[tool->channel][i][0]);
closest_point = i;
}
}
if (distance > MIN_DISTANCE)
closest_point = (x + 8) / 16;
switch (event->type)
{
case GDK_BUTTON_PRESS:
bevent = (GdkEventButton *) event;
if (bevent->button != 1)
return TRUE;
new_cursor = GDK_TCROSS;
switch (tool->curves->curve_type[tool->channel])
{
case GIMP_CURVE_SMOOTH:
/* determine the leftmost and rightmost points */
tool->leftmost = -1;
for (i = closest_point - 1; i >= 0; i--)
if (tool->curves->points[tool->channel][i][0] != -1)
{
tool->leftmost = tool->curves->points[tool->channel][i][0];
break;
}
tool->rightmost = 256;
for (i = closest_point + 1; i < CURVES_NUM_POINTS; i++)
if (tool->curves->points[tool->channel][i][0] != -1)
{
tool->rightmost = tool->curves->points[tool->channel][i][0];
break;
}
tool->grab_point = closest_point;
tool->curves->points[tool->channel][tool->grab_point][0] = x;
tool->curves->points[tool->channel][tool->grab_point][1] = 255 - y;
break;
case GIMP_CURVE_FREE:
tool->curves->curve[tool->channel][x] = 255 - y;
tool->grab_point = x;
tool->last = y;
break;
}
curves_calculate_curve (tool->curves, tool->channel);
curves_update (tool, XRANGE | GRAPH);
return TRUE;
case GDK_BUTTON_RELEASE:
bevent = (GdkEventButton *) event;
if (bevent->button != 1)
return TRUE;
new_cursor = GDK_FLEUR;
tool->grab_point = -1;
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (tool));
return TRUE;
case GDK_MOTION_NOTIFY:
mevent = (GdkEventMotion *) event;
switch (tool->curves->curve_type[tool->channel])
{
case GIMP_CURVE_SMOOTH:
/* If no point is grabbed... */
if (tool->grab_point == -1)
{
if (tool->curves->points[tool->channel][closest_point][0] != -1)
new_cursor = GDK_FLEUR;
else
new_cursor = GDK_TCROSS;
}
/* Else, drag the grabbed point */
else
{
new_cursor = GDK_TCROSS;
tool->curves->points[tool->channel][tool->grab_point][0] = -1;
if (x > tool->leftmost && x < tool->rightmost)
{
closest_point = (x + 8) / 16;
if (tool->curves->points[tool->channel][closest_point][0] == -1)
tool->grab_point = closest_point;
tool->curves->points[tool->channel][tool->grab_point][0] = x;
tool->curves->points[tool->channel][tool->grab_point][1] = 255 - y;
}
curves_calculate_curve (tool->curves, tool->channel);
}
break;
case GIMP_CURVE_FREE:
if (tool->grab_point != -1)
{
if (tool->grab_point > x)
{
x1 = x;
x2 = tool->grab_point;
y1 = y;
y2 = tool->last;
}
else
{
x1 = tool->grab_point;
x2 = x;
y1 = tool->last;
y2 = y;
}
if (x2 != x1)
for (i = x1; i <= x2; i++)
tool->curves->curve[tool->channel][i] =
255 - (y1 + ((y2 - y1) * (i - x1)) / (x2 - x1));
else
tool->curves->curve[tool->channel][x] = 255 - y;
tool->grab_point = x;
tool->last = y;
}
if (mevent->state & GDK_BUTTON1_MASK)
new_cursor = GDK_TCROSS;
else
new_cursor = GDK_PENCIL;
break;
}
if (new_cursor != cursor_type)
{
cursor_type = new_cursor;
gimp_cursor_set (tool->graph,
GIMP_GUI_CONFIG (GIMP_TOOL (tool)->tool_info->gimp->config)->cursor_format,
cursor_type,
GIMP_TOOL_CURSOR_NONE,
GIMP_CURSOR_MODIFIER_NONE);
}
tool->cursor_x = x;
tool->cursor_y = y;
curves_update (tool, XRANGE | GRAPH);
return TRUE;
case GDK_LEAVE_NOTIFY:
tool->cursor_x = -1;
tool->cursor_y = -1;
curves_update (tool, GRAPH);
return TRUE;
default:
break;
}
return FALSE;
}
static void
curve_print_loc (GimpCurvesTool *tool)
{
gchar buf[32];
gint x, y;
gint w, h;
if (tool->cursor_x < 0 || tool->cursor_x > 255 ||
tool->cursor_y < 0 || tool->cursor_y > 255)
return;
if (! tool->cursor_layout)
{
tool->cursor_layout = gtk_widget_create_pango_layout (tool->graph,
"x:888 y:888");
pango_layout_get_pixel_extents (tool->cursor_layout,
NULL, &tool->cursor_rect);
}
x = RADIUS * 2 + 2;
y = RADIUS * 2 + 2;
w = tool->cursor_rect.width + 4;
h = tool->cursor_rect.height + 4;
gdk_draw_rectangle (tool->graph->window,
tool->graph->style->base_gc[GTK_STATE_ACTIVE],
TRUE,
x, y, w + 1, h + 1);
gdk_draw_rectangle (tool->graph->window,
tool->graph->style->text_gc[GTK_STATE_NORMAL],
FALSE,
x, y, w, h);
g_snprintf (buf, sizeof (buf), "x:%3d y:%3d",
tool->cursor_x, 255 - tool->cursor_y);
pango_layout_set_text (tool->cursor_layout, buf, 11);
gdk_draw_layout (tool->graph->window,
tool->graph->style->text_gc[GTK_STATE_ACTIVE],
x + 2, y + 2,
tool->cursor_layout);
}
static gboolean
curves_graph_expose (GtkWidget *widget,
GdkEventExpose *eevent,
GimpCurvesTool *tool)
{
GimpHistogramChannel channel;
gint width;
gint height;
gint x, y, i;
GdkPoint points[256];
GdkGC *graph_gc;
width = widget->allocation.width - 2 * RADIUS;
height = widget->allocation.height - 2 * RADIUS;
if (width < 1 || height < 1)
return FALSE;
if (tool->color)
{
channel = tool->channel;
}
else
{
/* FIXME: hack */
if (tool->channel == 1)
channel = GIMP_HISTOGRAM_ALPHA;
else
channel = GIMP_HISTOGRAM_VALUE;
}
/* Draw the grid lines */
for (i = 1; i < 4; i++)
{
gdk_draw_line (widget->window,
tool->graph->style->dark_gc[GTK_STATE_NORMAL],
RADIUS,
RADIUS + i * (height / 4),
RADIUS + width - 1,
RADIUS + i * (height / 4));
gdk_draw_line (widget->window,
tool->graph->style->dark_gc[GTK_STATE_NORMAL],
RADIUS + i * (width / 4),
RADIUS,
RADIUS + i * (width / 4),
RADIUS + height - 1);
}
/* Draw the curve */
graph_gc = tool->graph->style->text_gc[GTK_STATE_NORMAL];
for (i = 0; i < 256; i++)
{
x = i;
y = 255 - tool->curves->curve[tool->channel][x];
points[i].x = RADIUS + ROUND ((gdouble) width * x / 256.0);
points[i].y = RADIUS + ROUND ((gdouble) height * y / 256.0);
}
gdk_draw_lines (widget->window, graph_gc, points, 256);
if (tool->curves->curve_type[tool->channel] == GIMP_CURVE_SMOOTH)
{
/* Draw the points */
for (i = 0; i < CURVES_NUM_POINTS; i++)
{
x = tool->curves->points[tool->channel][i][0];
if (x < 0)
continue;
y = 255 - tool->curves->points[tool->channel][i][1];
gdk_draw_arc (widget->window,
graph_gc,
TRUE,
ROUND ((gdouble) width * x / 256.0),
ROUND ((gdouble) height * y / 256.0),
RADIUS * 2, RADIUS * 2, 0, 23040);
}
}
if (tool->col_value[channel] >= 0)
{
gchar buf[32];
/* draw the color line */
gdk_draw_line (widget->window,
graph_gc,
RADIUS +
ROUND ((gdouble) width *
(tool->col_value[channel]) / 256.0),
RADIUS,
RADIUS +
ROUND ((gdouble) width *
(tool->col_value[channel]) / 256.0),
height + RADIUS - 1);
/* and xpos indicator */
g_snprintf (buf, sizeof (buf), "x:%d",
tool->col_value[channel]);
if (! tool->xpos_layout)
tool->xpos_layout = gtk_widget_create_pango_layout (tool->graph, buf);
else
pango_layout_set_text (tool->xpos_layout, buf, -1);
pango_layout_get_pixel_size (tool->xpos_layout, &x, &y);
if ((tool->col_value[channel] + RADIUS) < 127)
x = RADIUS + 4;
else
x = -(x + 2);
gdk_draw_layout (widget->window,
graph_gc,
RADIUS +
ROUND (((gdouble) width * (tool->col_value[channel])) / 256.0 + x),
height - y - 2,
tool->xpos_layout);
}
curve_print_loc (tool);
return FALSE;
}
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