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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 <errno.h>
#ifdef __GNUC__
#warning GTK_DISABLE_DEPRECATED
#endif
#undef GTK_DISABLE_DEPRECATED
#include <gtk/gtk.h>
#include "libgimpmath/gimpmath.h"
#include "libgimpbase/gimpbase.h"
#include "libgimpcolor/gimpcolor.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "tools-types.h"
#include "base/curves.h"
#include "base/gimphistogram.h"
#include "base/gimplut.h"
#include "core/gimpdrawable.h"
#include "core/gimpimage.h"
#include "core/gimpimagemap.h"
#include "core/gimptoolinfo.h"
#include "widgets/gimpcursor.h"
#include "widgets/gimpenummenu.h"
#include "widgets/gimphelp-ids.h"
#include "display/gimpdisplay.h"
#include "gimpcoloroptions.h"
#include "gimpcurvestool.h"
#include "gimptoolcontrol.h"
#include "gimp-intl.h"
#define XRANGE_TOP (1 << 0)
#define XRANGE_BOTTOM (1 << 1)
#define YRANGE (1 << 2)
#define ALL (XRANGE_TOP | XRANGE_BOTTOM | YRANGE)
/* NB: take care when changing these values: make sure the curve[] array in
* base/curves.h is large enough.
*/
#define GRAPH_WIDTH 256
#define GRAPH_HEIGHT 256
#define XRANGE_WIDTH 256
#define XRANGE_HEIGHT 16
#define YRANGE_WIDTH 16
#define YRANGE_HEIGHT 256
#define RADIUS 3
#define MIN_DISTANCE 8
#define GRAPH_MASK (GDK_EXPOSURE_MASK | \
GDK_LEAVE_NOTIFY_MASK | \
GDK_POINTER_MOTION_MASK | \
GDK_BUTTON_PRESS_MASK | \
GDK_BUTTON_RELEASE_MASK)
/* local function prototypes */
static void gimp_curves_tool_class_init (GimpCurvesToolClass *klass);
static void gimp_curves_tool_init (GimpCurvesTool *c_tool);
static void gimp_curves_tool_finalize (GObject *object);
static void 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,
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 void curves_add_point (GimpCurvesTool *c_tool,
gint x,
gint y,
gint cchan);
static void curves_update (GimpCurvesTool *c_tool,
gint update);
static void curves_channel_callback (GtkWidget *widget,
GimpCurvesTool *c_tool);
static void curves_channel_reset_callback (GtkWidget *widget,
GimpCurvesTool *c_tool);
static gboolean curves_set_sensitive_callback (gpointer item_data,
GimpCurvesTool *c_tool);
static void curves_curve_type_callback (GtkWidget *widget,
GimpCurvesTool *c_tool);
static void curves_load_callback (GtkWidget *widget,
GimpCurvesTool *c_tool);
static void curves_save_callback (GtkWidget *widget,
GimpCurvesTool *c_tool);
static gint curves_graph_events (GtkWidget *widget,
GdkEvent *event,
GimpCurvesTool *c_tool);
static void curves_graph_expose (GtkWidget *widget,
GdkRectangle *area,
GimpCurvesTool *c_tool);
static void file_dialog_create (GimpCurvesTool *c_tool);
static void file_dialog_ok_callback (GimpCurvesTool *c_tool);
static gboolean curves_read_from_file (GimpCurvesTool *c_tool,
FILE *file);
static void curves_write_to_file (GimpCurvesTool *c_tool,
FILE *file);
static GimpImageMapToolClass *parent_class = NULL;
/* public functions */
void
gimp_curves_tool_register (GimpToolRegisterCallback callback,
gpointer data)
{
(* callback) (GIMP_TYPE_CURVES_TOOL,
GIMP_TYPE_COLOR_OPTIONS,
gimp_color_options_gui,
0,
"gimp-curves-tool",
_("Curves"),
_("Adjust color curves"),
N_("/Tools/Color Tools/_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->map = gimp_curves_tool_map;
image_map_tool_class->dialog = gimp_curves_tool_dialog;
image_map_tool_class->reset = gimp_curves_tool_reset;
}
static void
gimp_curves_tool_init (GimpCurvesTool *c_tool)
{
GimpImageMapTool *image_map_tool;
gint i;
image_map_tool = GIMP_IMAGE_MAP_TOOL (c_tool);
image_map_tool->shell_identifier = "gimp-curves-tool-dialog";
image_map_tool->shell_desc = _("Adjust Color Curves");
c_tool->curves = g_new0 (Curves, 1);
c_tool->lut = gimp_lut_new ();
c_tool->channel = GIMP_HISTOGRAM_VALUE;
curves_init (c_tool->curves);
for (i = 0; i < G_N_ELEMENTS (c_tool->col_value); i++)
c_tool->col_value[i] = -1;
c_tool->cursor_x = -1;
c_tool->cursor_y = -1;
}
static void
gimp_curves_tool_finalize (GObject *object)
{
GimpCurvesTool *c_tool;
c_tool = GIMP_CURVES_TOOL (object);
if (c_tool->curves)
{
g_free (c_tool->curves);
c_tool->curves = NULL;
}
if (c_tool->lut)
{
gimp_lut_free (c_tool->lut);
c_tool->lut = NULL;
}
if (c_tool->cursor_layout)
{
g_object_unref (c_tool->cursor_layout);
c_tool->cursor_layout = NULL;
}
if (c_tool->xpos_layout)
{
g_object_unref (c_tool->xpos_layout);
c_tool->xpos_layout = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_curves_tool_initialize (GimpTool *tool,
GimpDisplay *gdisp)
{
GimpCurvesTool *c_tool;
GimpDrawable *drawable;
c_tool = GIMP_CURVES_TOOL (tool);
if (gimp_drawable_is_indexed (gimp_image_active_drawable (gdisp->gimage)))
{
g_message (_("Curves for indexed drawables cannot be adjusted."));
return;
}
drawable = gimp_image_active_drawable (gdisp->gimage);
curves_init (c_tool->curves);
c_tool->color = gimp_drawable_is_rgb (drawable);
c_tool->channel = GIMP_HISTOGRAM_VALUE;
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));
/* set the sensitivity of the channel menu based on the drawable type */
gimp_option_menu_set_sensitive (GTK_OPTION_MENU (c_tool->channel_menu),
(GimpOptionMenuSensitivityCallback) curves_set_sensitive_callback,
c_tool);
/* set the current selection */
gimp_option_menu_set_history (GTK_OPTION_MENU (c_tool->channel_menu),
GINT_TO_POINTER (c_tool->channel));
curves_update (c_tool, ALL);
}
static void
gimp_curves_tool_button_release (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *gdisp)
{
GimpCurvesTool *c_tool;
GimpDrawable *drawable;
c_tool = GIMP_CURVES_TOOL (tool);
drawable = gimp_image_active_drawable (gdisp->gimage);
if (state & GDK_SHIFT_MASK)
{
curves_add_point (c_tool, coords->x, coords->y, c_tool->channel);
curves_calculate_curve (c_tool->curves, c_tool->channel);
}
else if (state & GDK_CONTROL_MASK)
{
gint i;
for (i = 0; i < 5; i++)
{
curves_add_point (c_tool, coords->x, coords->y, i);
curves_calculate_curve (c_tool->curves, c_tool->channel);
}
}
/* 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,
GimpImageType sample_type,
GimpRGB *color,
gint color_index)
{
GimpCurvesTool *c_tool;
GimpDrawable *drawable;
guchar r, g, b, a;
c_tool = GIMP_CURVES_TOOL (color_tool);
drawable = GIMP_IMAGE_MAP_TOOL (c_tool)->drawable;
gimp_rgba_get_uchar (color, &r, &g, &b, &a);
c_tool->col_value[GIMP_HISTOGRAM_RED] = r;
c_tool->col_value[GIMP_HISTOGRAM_GREEN] = g;
c_tool->col_value[GIMP_HISTOGRAM_BLUE] = b;
if (gimp_drawable_has_alpha (drawable))
c_tool->col_value[GIMP_HISTOGRAM_ALPHA] = a;
if (gimp_drawable_is_indexed (drawable))
c_tool->col_value[GIMP_HISTOGRAM_ALPHA] = color_index;
c_tool->col_value[GIMP_HISTOGRAM_VALUE] = MAX (MAX (r, g), b);
gtk_widget_queue_draw (c_tool->graph);
}
static void
curves_add_point (GimpCurvesTool *c_tool,
gint x,
gint y,
gint cchan)
{
/* Add point onto the curve */
gint closest_point = 0;
gint distance;
gint curvex;
gint i;
switch (c_tool->curves->curve_type[cchan])
{
case GIMP_CURVE_SMOOTH:
curvex = c_tool->col_value[cchan];
distance = G_MAXINT;
for (i = 0; i < 17; i++)
{
if (c_tool->curves->points[cchan][i][0] != -1)
if (abs (curvex - c_tool->curves->points[cchan][i][0]) < distance)
{
distance = abs (curvex - c_tool->curves->points[cchan][i][0]);
closest_point = i;
}
}
if (distance > MIN_DISTANCE)
closest_point = (curvex + 8) / 16;
c_tool->curves->points[cchan][closest_point][0] = curvex;
c_tool->curves->points[cchan][closest_point][1] = c_tool->curves->curve[cchan][curvex];
break;
case GIMP_CURVE_FREE:
c_tool->curves->curve[cchan][x] = 255 - y;
break;
}
}
static void
gimp_curves_tool_map (GimpImageMapTool *image_map_tool)
{
GimpCurvesTool *c_tool;
c_tool = GIMP_CURVES_TOOL (image_map_tool);
gimp_lut_setup (c_tool->lut,
(GimpLutFunc) curves_lut_func,
c_tool->curves,
gimp_drawable_bytes (image_map_tool->drawable));
gimp_image_map_apply (image_map_tool->image_map,
(GimpImageMapApplyFunc) gimp_lut_process_2,
c_tool->lut);
}
/*******************/
/* Curves dialog */
/*******************/
static void
gimp_curves_tool_dialog (GimpImageMapTool *image_map_tool)
{
GimpCurvesTool *c_tool;
GtkWidget *hbox;
GtkWidget *vbox;
GtkWidget *hbbox;
GtkWidget *frame;
GtkWidget *menu;
GtkWidget *table;
GtkWidget *button;
c_tool = GIMP_CURVES_TOOL (image_map_tool);
hbox = gtk_hbox_new (FALSE, 0);
gtk_box_pack_start (GTK_BOX (image_map_tool->main_vbox), hbox,
FALSE, FALSE, 0);
gtk_widget_show (hbox);
vbox = gtk_vbox_new (FALSE, 4);
gtk_box_pack_start (GTK_BOX (hbox), vbox, TRUE, FALSE, 0);
gtk_widget_show (vbox);
table = gtk_table_new (2, 2, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 4);
gtk_table_set_row_spacings (GTK_TABLE (table), 2);
gtk_box_pack_start (GTK_BOX (vbox), table, FALSE, FALSE, 0);
gtk_widget_show (table);
/* The option menu for selecting channels */
hbox = gtk_hbox_new (FALSE, 4);
menu = gimp_enum_option_menu_new (GIMP_TYPE_HISTOGRAM_CHANNEL,
G_CALLBACK (curves_channel_callback),
c_tool);
gimp_enum_option_menu_set_stock_prefix (GTK_OPTION_MENU (menu),
"gimp-channel");
gtk_box_pack_start (GTK_BOX (hbox), menu, FALSE, FALSE, 0);
gtk_widget_show (menu);
c_tool->channel_menu = 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),
c_tool);
gimp_table_attach_aligned (GTK_TABLE (table), 0, 0,
_("Modify Curves for Channel:"), 1.0, 0.5,
hbox, 1, FALSE);
/* The table for the yrange and the graph */
hbox = gtk_hbox_new (FALSE, 0);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
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 (hbox), table, TRUE, FALSE, 0);
/* The range drawing area */
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_table_attach (GTK_TABLE (table), frame, 0, 1, 0, 1,
GTK_EXPAND, GTK_EXPAND, 0, 0);
gtk_widget_show (frame);
c_tool->yrange = gtk_preview_new (GTK_PREVIEW_COLOR);
gtk_preview_size (GTK_PREVIEW (c_tool->yrange), YRANGE_WIDTH, YRANGE_HEIGHT);
gtk_container_add (GTK_CONTAINER (frame), c_tool->yrange);
gtk_widget_show (c_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_SHRINK | GTK_FILL,
GTK_SHRINK | GTK_FILL, 0, 0);
gtk_widget_show (frame);
c_tool->graph = gtk_drawing_area_new ();
gtk_widget_set_size_request (c_tool->graph,
GRAPH_WIDTH + RADIUS * 2,
GRAPH_HEIGHT + RADIUS * 2);
gtk_widget_set_events (c_tool->graph, GRAPH_MASK);
gtk_container_add (GTK_CONTAINER (frame), c_tool->graph);
gtk_widget_show (c_tool->graph);
g_signal_connect (c_tool->graph, "event",
G_CALLBACK (curves_graph_events),
c_tool);
/* The range drawing area */
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, 1, 2,
GTK_EXPAND, GTK_EXPAND, 0, 0);
gtk_widget_show (frame);
c_tool->xrange = gtk_preview_new (GTK_PREVIEW_COLOR);
gtk_preview_size (GTK_PREVIEW (c_tool->xrange), XRANGE_WIDTH, XRANGE_HEIGHT);
gtk_container_add (GTK_CONTAINER (frame), c_tool->xrange);
gtk_widget_show (c_tool->xrange);
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 = gtk_frame_new (_("All Channels"));
gtk_box_pack_start (GTK_BOX (hbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
hbbox = gtk_hbutton_box_new ();
gtk_container_set_border_width (GTK_CONTAINER (hbbox), 2);
gtk_box_set_spacing (GTK_BOX (hbbox), 4);
gtk_button_box_set_layout (GTK_BUTTON_BOX (hbbox), GTK_BUTTONBOX_SPREAD);
gtk_container_add (GTK_CONTAINER (frame), hbbox);
gtk_widget_show (hbbox);
button = gtk_button_new_from_stock (GTK_STOCK_OPEN);
GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
gtk_box_pack_start (GTK_BOX (hbbox), button, FALSE, FALSE, 0);
gimp_help_set_help_data (button, _("Read curves settings from file"), NULL);
gtk_widget_show (button);
g_signal_connect (button, "clicked",
G_CALLBACK (curves_load_callback),
c_tool);
button = gtk_button_new_from_stock (GTK_STOCK_SAVE);
GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
gtk_box_pack_start (GTK_BOX (hbbox), button, FALSE, FALSE, 0);
gimp_help_set_help_data (button, _("Save curves settings to file"), NULL);
gtk_widget_show (button);
g_signal_connect (button, "clicked",
G_CALLBACK (curves_save_callback),
c_tool);
/* The radio box for selecting the curve type */
frame = gtk_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),
c_tool,
&c_tool->curve_type);
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 *c_tool;
GimpHistogramChannel channel;
c_tool = GIMP_CURVES_TOOL (image_map_tool);
c_tool->grab_point = -1;
for (channel = GIMP_HISTOGRAM_VALUE;
channel <= GIMP_HISTOGRAM_ALPHA;
channel++)
curves_channel_reset (c_tool->curves, channel);
curves_update (c_tool, XRANGE_TOP);
gtk_widget_queue_draw (c_tool->graph);
}
/* TODO: preview alpha channel stuff correctly. -- austin, 20/May/99 */
static void
curves_update (GimpCurvesTool *c_tool,
gint update)
{
GimpHistogramChannel sel_channel;
gint i, j;
if (c_tool->color)
{
sel_channel = c_tool->channel;
}
else
{
if (c_tool->channel == 2)
sel_channel = GIMP_HISTOGRAM_ALPHA;
else
sel_channel = GIMP_HISTOGRAM_VALUE;
}
if (update & XRANGE_TOP)
{
guchar buf[XRANGE_WIDTH * 3];
switch (sel_channel)
{
case GIMP_HISTOGRAM_VALUE:
case GIMP_HISTOGRAM_ALPHA:
for (i = 0; i < XRANGE_HEIGHT / 2; i++)
{
for (j = 0; j < XRANGE_WIDTH ; j++)
{
buf[j * 3 + 0] = c_tool->curves->curve[sel_channel][j];
buf[j * 3 + 1] = c_tool->curves->curve[sel_channel][j];
buf[j * 3 + 2] = c_tool->curves->curve[sel_channel][j];
}
gtk_preview_draw_row (GTK_PREVIEW (c_tool->xrange),
buf, 0, i, XRANGE_WIDTH);
}
break;
case GIMP_HISTOGRAM_RED:
case GIMP_HISTOGRAM_GREEN:
case GIMP_HISTOGRAM_BLUE:
{
for (i = 0; i < XRANGE_HEIGHT / 2; i++)
{
for (j = 0; j < XRANGE_WIDTH; j++)
{
buf[j * 3 + 0] = c_tool->curves->curve[GIMP_HISTOGRAM_RED][j];
buf[j * 3 + 1] = c_tool->curves->curve[GIMP_HISTOGRAM_GREEN][j];
buf[j * 3 + 2] = c_tool->curves->curve[GIMP_HISTOGRAM_BLUE][j];
}
gtk_preview_draw_row (GTK_PREVIEW (c_tool->xrange),
buf, 0, i, XRANGE_WIDTH);
}
break;
}
default:
g_warning ("unknown channel type %d, can't happen!?!?",
c_tool->channel);
break;
}
gtk_widget_queue_draw_area (c_tool->xrange,
0, 0,
XRANGE_WIDTH, XRANGE_HEIGHT / 2);
}
if (update & XRANGE_BOTTOM)
{
guchar buf[XRANGE_WIDTH * 3];
for (i = 0; i < XRANGE_WIDTH; i++)
{
buf[i * 3 + 0] = i;
buf[i * 3 + 1] = i;
buf[i * 3 + 2] = i;
}
for (i = XRANGE_HEIGHT / 2; i < XRANGE_HEIGHT; i++)
gtk_preview_draw_row (GTK_PREVIEW (c_tool->xrange),
buf, 0, i, XRANGE_WIDTH);
gtk_widget_queue_draw_area (c_tool->xrange,
0, XRANGE_HEIGHT / 2,
XRANGE_WIDTH, XRANGE_HEIGHT / 2);
}
if (update & YRANGE)
{
guchar buf[YRANGE_WIDTH * 3];
guchar pix[3];
for (i = 0; i < YRANGE_HEIGHT; i++)
{
switch (sel_channel)
{
case GIMP_HISTOGRAM_VALUE:
case GIMP_HISTOGRAM_ALPHA:
pix[0] = pix[1] = pix[2] = (255 - i);
break;
case GIMP_HISTOGRAM_RED:
case GIMP_HISTOGRAM_GREEN:
case GIMP_HISTOGRAM_BLUE:
pix[0] = pix[1] = pix[2] = 0;
pix[sel_channel - 1] = (255 - i);
break;
default:
g_warning ("unknown channel type %d, can't happen!?!?",
c_tool->channel);
break;
}
for (j = 0; j < YRANGE_WIDTH * 3; j++)
buf[j] = pix[j%3];
gtk_preview_draw_row (GTK_PREVIEW (c_tool->yrange),
buf, 0, i, YRANGE_WIDTH);
}
gtk_widget_queue_draw (c_tool->yrange);
}
}
static void
curves_channel_callback (GtkWidget *widget,
GimpCurvesTool *c_tool)
{
gimp_menu_item_update (widget, &c_tool->channel);
if (! c_tool->color)
{
if (c_tool->channel > 1)
c_tool->channel = 2;
else
c_tool->channel = 1;
}
gimp_radio_group_set_active (GTK_RADIO_BUTTON (c_tool->curve_type),
GINT_TO_POINTER (c_tool->curves->curve_type[c_tool->channel]));
curves_update (c_tool, XRANGE_TOP | YRANGE);
gtk_widget_queue_draw (c_tool->graph);
}
static void
curves_channel_reset_callback (GtkWidget *widget,
GimpCurvesTool *c_tool)
{
c_tool->grab_point = -1;
curves_channel_reset (c_tool->curves, c_tool->channel);
curves_update (c_tool, XRANGE_TOP);
gtk_widget_queue_draw (c_tool->graph);
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (c_tool));
}
static gboolean
curves_set_sensitive_callback (gpointer item_data,
GimpCurvesTool *c_tool)
{
GimpHistogramChannel channel = GPOINTER_TO_INT (item_data);
switch (channel)
{
case GIMP_HISTOGRAM_VALUE:
return TRUE;
case GIMP_HISTOGRAM_RED:
case GIMP_HISTOGRAM_GREEN:
case GIMP_HISTOGRAM_BLUE:
return c_tool->color;
case GIMP_HISTOGRAM_ALPHA:
return gimp_drawable_has_alpha (GIMP_IMAGE_MAP_TOOL (c_tool)->drawable);
}
return FALSE;
}
static void
curves_curve_type_callback (GtkWidget *widget,
GimpCurvesTool *c_tool)
{
GimpCurveType curve_type;
gimp_radio_button_update (widget, &curve_type);
if (c_tool->curves->curve_type[c_tool->channel] != curve_type)
{
c_tool->curves->curve_type[c_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);
c_tool->curves->points[c_tool->channel][i * 2][0] = index;
c_tool->curves->points[c_tool->channel][i * 2][1] = c_tool->curves->curve[c_tool->channel][index];
}
}
curves_calculate_curve (c_tool->curves, c_tool->channel);
curves_update (c_tool, XRANGE_TOP);
gtk_widget_queue_draw (c_tool->graph);
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (c_tool));
}
}
static gboolean
curves_graph_events (GtkWidget *widget,
GdkEvent *event,
GimpCurvesTool *c_tool)
{
static GdkCursorType cursor_type = GDK_TOP_LEFT_ARROW;
GdkCursorType new_cursor = GDK_X_CURSOR;
GdkEventButton *bevent;
GdkEventMotion *mevent;
gint i;
gint tx, ty;
gint x, y;
gint closest_point;
gint distance;
gint x1, x2, y1, y2;
if (event->type == GDK_EXPOSE)
{
curves_graph_expose (widget, &((GdkEventExpose *) event)->area, c_tool);
return TRUE;
}
/* get the pointer position */
gdk_window_get_pointer (c_tool->graph->window, &tx, &ty, NULL);
x = CLAMP ((tx - RADIUS), 0, 255);
y = CLAMP ((ty - RADIUS), 0, 255);
distance = G_MAXINT;
for (i = 0, closest_point = 0; i < 17; i++)
{
if (c_tool->curves->points[c_tool->channel][i][0] != -1)
if (abs (x - c_tool->curves->points[c_tool->channel][i][0]) < distance)
{
distance = abs (x - c_tool->curves->points[c_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;
new_cursor = GDK_TCROSS;
switch (c_tool->curves->curve_type[c_tool->channel])
{
case GIMP_CURVE_SMOOTH:
/* determine the leftmost and rightmost points */
c_tool->leftmost = -1;
for (i = closest_point - 1; i >= 0; i--)
if (c_tool->curves->points[c_tool->channel][i][0] != -1)
{
c_tool->leftmost = c_tool->curves->points[c_tool->channel][i][0];
break;
}
c_tool->rightmost = 256;
for (i = closest_point + 1; i < 17; i++)
if (c_tool->curves->points[c_tool->channel][i][0] != -1)
{
c_tool->rightmost = c_tool->curves->points[c_tool->channel][i][0];
break;
}
c_tool->grab_point = closest_point;
c_tool->curves->points[c_tool->channel][c_tool->grab_point][0] = x;
c_tool->curves->points[c_tool->channel][c_tool->grab_point][1] = 255 - y;
break;
case GIMP_CURVE_FREE:
c_tool->curves->curve[c_tool->channel][x] = 255 - y;
c_tool->grab_point = x;
c_tool->last = y;
break;
}
gtk_grab_add (widget);
curves_calculate_curve (c_tool->curves, c_tool->channel);
curves_update (c_tool, XRANGE_TOP);
gtk_widget_queue_draw (c_tool->graph);
return TRUE;
case GDK_BUTTON_RELEASE:
new_cursor = GDK_FLEUR;
c_tool->grab_point = -1;
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (c_tool));
gtk_grab_remove (widget);
return TRUE;
case GDK_MOTION_NOTIFY:
mevent = (GdkEventMotion *) event;
switch (c_tool->curves->curve_type[c_tool->channel])
{
case GIMP_CURVE_SMOOTH:
/* If no point is grabbed... */
if (c_tool->grab_point == -1)
{
if (c_tool->curves->points[c_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;
c_tool->curves->points[c_tool->channel][c_tool->grab_point][0] = -1;
if (x > c_tool->leftmost && x < c_tool->rightmost)
{
closest_point = (x + 8) / 16;
if (c_tool->curves->points[c_tool->channel][closest_point][0] == -1)
c_tool->grab_point = closest_point;
c_tool->curves->points[c_tool->channel][c_tool->grab_point][0] = x;
c_tool->curves->points[c_tool->channel][c_tool->grab_point][1] = 255 - y;
}
curves_calculate_curve (c_tool->curves, c_tool->channel);
}
break;
case GIMP_CURVE_FREE:
if (c_tool->grab_point != -1)
{
if (c_tool->grab_point > x)
{
x1 = x;
x2 = c_tool->grab_point;
y1 = y;
y2 = c_tool->last;
}
else
{
x1 = c_tool->grab_point;
x2 = x;
y1 = c_tool->last;
y2 = y;
}
if (x2 != x1)
for (i = x1; i <= x2; i++)
c_tool->curves->curve[c_tool->channel][i] = 255 - (y1 + ((y2 - y1) * (i - x1)) / (x2 - x1));
else
c_tool->curves->curve[c_tool->channel][x] = 255 - y;
c_tool->grab_point = x;
c_tool->last = y;
}
if (mevent->state & GDK_BUTTON1_MASK)
new_cursor = GDK_TCROSS;
else
new_cursor = GDK_PENCIL;
break;
}
if (new_cursor != cursor_type)
{
GdkCursor *cursor;
cursor_type = new_cursor;
cursor = gimp_cursor_new (cursor_type,
GIMP_TOOL_CURSOR_NONE,
GIMP_CURSOR_MODIFIER_NONE);
gdk_window_set_cursor (c_tool->graph->window, cursor);
gdk_cursor_unref (cursor);
}
curves_update (c_tool, XRANGE_TOP);
c_tool->cursor_x = tx - RADIUS;
c_tool->cursor_y = ty - RADIUS;
gtk_widget_queue_draw (c_tool->graph);
return TRUE;
case GDK_LEAVE_NOTIFY:
c_tool->cursor_x = -1;
c_tool->cursor_y = -1;
gtk_widget_queue_draw (c_tool->graph);
return TRUE;
default:
break;
}
return FALSE;
}
static void
curve_print_loc (GimpCurvesTool *c_tool)
{
gchar buf[32];
gint x, y;
gint w, h;
if (c_tool->cursor_x < 0 || c_tool->cursor_x > 255)
return;
if (c_tool->cursor_y < 0 || c_tool->cursor_y > 255)
return;
if (! c_tool->cursor_layout)
{
c_tool->cursor_layout = gtk_widget_create_pango_layout (c_tool->graph,
"x:888 y:888");
pango_layout_get_pixel_extents (c_tool->cursor_layout,
NULL, &c_tool->cursor_rect);
}
x = RADIUS * 2 + 2;
y = RADIUS * 2 + 2;
w = c_tool->cursor_rect.width + 4;
h = c_tool->cursor_rect.height + 4;
gdk_draw_rectangle (c_tool->graph->window,
c_tool->graph->style->bg_gc[GTK_STATE_ACTIVE],
TRUE,
x, y, w + 1, h + 1);
gdk_draw_rectangle (c_tool->graph->window,
c_tool->graph->style->black_gc,
FALSE,
x, y, w, h);
g_snprintf (buf, sizeof (buf), "x:%3d y:%3d",
c_tool->cursor_x, 255 - c_tool->cursor_y);
pango_layout_set_text (c_tool->cursor_layout, buf, 11);
gdk_draw_layout (c_tool->graph->window,
c_tool->graph->style->black_gc,
x + 2, y + 2,
c_tool->cursor_layout);
}
static void
curves_graph_expose (GtkWidget *widget,
GdkRectangle *area,
GimpCurvesTool *c_tool)
{
GimpHistogramChannel sel_channel;
gchar buf[32];
gint offset;
gint height;
gint i;
GdkPoint points[256];
if (c_tool->color)
{
sel_channel = c_tool->channel;
}
else
{
if (c_tool->channel == 2)
sel_channel = GIMP_HISTOGRAM_ALPHA;
else
sel_channel = GIMP_HISTOGRAM_VALUE;
}
/* Draw the grid lines */
for (i = 0; i < 5; i++)
{
gdk_draw_line (widget->window,
c_tool->graph->style->dark_gc[GTK_STATE_NORMAL],
RADIUS, i * (GRAPH_HEIGHT / 4) + RADIUS,
GRAPH_WIDTH + RADIUS, i * (GRAPH_HEIGHT / 4) + RADIUS);
gdk_draw_line (widget->window,
c_tool->graph->style->dark_gc[GTK_STATE_NORMAL],
i * (GRAPH_WIDTH / 4) + RADIUS, RADIUS,
i * (GRAPH_WIDTH / 4) + RADIUS, GRAPH_HEIGHT + RADIUS);
}
/* Draw the curve */
for (i = 0; i < 256; i++)
{
points[i].x = i + RADIUS;
points[i].y = 255 - c_tool->curves->curve[c_tool->channel][i] + RADIUS;
}
if (c_tool->curves->curve_type[c_tool->channel] == GIMP_CURVE_FREE)
{
gdk_draw_points (widget->window,
c_tool->graph->style->black_gc,
points, 256);
}
else
{
gdk_draw_lines (widget->window,
c_tool->graph->style->black_gc,
points, 256);
/* Draw the points */
for (i = 0; i < 17; i++)
{
if (c_tool->curves->points[c_tool->channel][i][0] != -1)
gdk_draw_arc (widget->window,
c_tool->graph->style->black_gc,
TRUE,
c_tool->curves->points[c_tool->channel][i][0],
255 - c_tool->curves->points[c_tool->channel][i][1],
RADIUS * 2, RADIUS * 2, 0, 23040);
}
}
if (c_tool->col_value[sel_channel] >= 0)
{
/* draw the color line */
gdk_draw_line (widget->window,
c_tool->graph->style->black_gc,
c_tool->col_value[sel_channel] + RADIUS,
RADIUS,
c_tool->col_value[sel_channel] + RADIUS,
GRAPH_HEIGHT + RADIUS);
/* and xpos indicator */
g_snprintf (buf, sizeof (buf), "x:%d",
c_tool->col_value[sel_channel]);
if (! c_tool->xpos_layout)
c_tool->xpos_layout = gtk_widget_create_pango_layout (c_tool->graph,
buf);
else
pango_layout_set_text (c_tool->xpos_layout, buf, -1);
pango_layout_get_pixel_size (c_tool->xpos_layout, &offset, &height);
if ((c_tool->col_value[sel_channel] + RADIUS) < 127)
offset = RADIUS + 4;
else
offset = - (offset + 2);
gdk_draw_layout (widget->window,
c_tool->graph->style->black_gc,
c_tool->col_value[sel_channel] + offset,
GRAPH_HEIGHT - height - 2,
c_tool->xpos_layout);
}
curve_print_loc (c_tool);
}
static void
curves_load_callback (GtkWidget *widget,
GimpCurvesTool *c_tool)
{
if (! c_tool->file_dialog)
file_dialog_create (c_tool);
else if (GTK_WIDGET_VISIBLE (c_tool->file_dialog))
return;
c_tool->is_save = FALSE;
gtk_window_set_title (GTK_WINDOW (c_tool->file_dialog), _("Load Curves"));
gtk_widget_show (c_tool->file_dialog);
}
static void
curves_save_callback (GtkWidget *widget,
GimpCurvesTool *c_tool)
{
if (! c_tool->file_dialog)
file_dialog_create (c_tool);
else if (GTK_WIDGET_VISIBLE (c_tool->file_dialog))
return;
c_tool->is_save = TRUE;
gtk_window_set_title (GTK_WINDOW (c_tool->file_dialog), _("Save Curves"));
gtk_widget_show (c_tool->file_dialog);
}
static void
file_dialog_create (GimpCurvesTool *c_tool)
{
GtkFileSelection *file_dlg;
gchar *temp;
c_tool->file_dialog = gtk_file_selection_new ("");
file_dlg = GTK_FILE_SELECTION (c_tool->file_dialog);
gtk_window_set_wmclass (GTK_WINDOW (file_dlg), "load_save_curves", "Gimp");
gtk_window_set_position (GTK_WINDOW (file_dlg), GTK_WIN_POS_MOUSE);
gtk_container_set_border_width (GTK_CONTAINER (file_dlg), 2);
gtk_container_set_border_width (GTK_CONTAINER (file_dlg->button_area), 2);
g_object_add_weak_pointer (G_OBJECT (file_dlg),
(gpointer) &c_tool->file_dialog);
gtk_window_set_transient_for (GTK_WINDOW (file_dlg),
GTK_WINDOW (GIMP_IMAGE_MAP_TOOL (c_tool)->shell));
gtk_window_set_destroy_with_parent (GTK_WINDOW (file_dlg), TRUE);
g_signal_connect_swapped (file_dlg->ok_button, "clicked",
G_CALLBACK (file_dialog_ok_callback),
c_tool);
g_signal_connect_swapped (file_dlg->cancel_button, "clicked",
G_CALLBACK (gtk_widget_destroy),
file_dlg);
temp = g_build_filename (gimp_directory (), "curves", ".", NULL);
gtk_file_selection_set_filename (file_dlg, temp);
g_free (temp);
gimp_help_connect (c_tool->file_dialog, gimp_standard_help_func,
GIMP_TOOL (c_tool)->tool_info->help_id, NULL);
}
static void
file_dialog_ok_callback (GimpCurvesTool *c_tool)
{
FILE *file = NULL;
const gchar *filename;
filename =
gtk_file_selection_get_filename (GTK_FILE_SELECTION (c_tool->file_dialog));
file = fopen (filename, c_tool->is_save ? "wt" : "rt");
if (! file)
{
g_message (_("Failed to open file: '%s': %s"),
filename, g_strerror (errno));
return;
}
if (c_tool->is_save)
{
curves_write_to_file (c_tool, file);
}
else if (! curves_read_from_file (c_tool, file))
{
g_message (("Error in reading file '%s'."), filename);
}
if (file)
fclose (file);
gtk_widget_destroy (c_tool->file_dialog);
}
static gboolean
curves_read_from_file (GimpCurvesTool *c_tool,
FILE *file)
{
gint i, j;
gint fields;
gchar buf[50];
gint index[5][17];
gint value[5][17];
if (! fgets (buf, 50, file))
return FALSE;
if (strcmp (buf, "# GIMP Curves File\n") != 0)
return FALSE;
for (i = 0; i < 5; i++)
{
for (j = 0; j < 17; j++)
{
fields = fscanf (file, "%d %d ", &index[i][j], &value[i][j]);
if (fields != 2)
{
g_print ("fields != 2");
return FALSE;
}
}
}
for (i = 0; i < 5; i++)
{
c_tool->curves->curve_type[i] = GIMP_CURVE_SMOOTH;
for (j = 0; j < 17; j++)
{
c_tool->curves->points[i][j][0] = index[i][j];
c_tool->curves->points[i][j][1] = value[i][j];
}
}
for (i = 0; i < 5; i++)
curves_calculate_curve (c_tool->curves, i);
curves_update (c_tool, ALL);
gtk_widget_queue_draw (c_tool->graph);
gimp_radio_group_set_active (GTK_RADIO_BUTTON (c_tool->curve_type),
GINT_TO_POINTER (GIMP_CURVE_SMOOTH));
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (c_tool));
return TRUE;
}
static void
curves_write_to_file (GimpCurvesTool *c_tool,
FILE *file)
{
gint i, j;
gint32 index;
for (i = 0; i < 5; i++)
if (c_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);
c_tool->curves->points[i][j * 2][0] = index;
c_tool->curves->points[i][j * 2][1] = c_tool->curves->curve[i][index];
}
}
fprintf (file, "# GIMP Curves File\n");
for (i = 0; i < 5; i++)
{
for (j = 0; j < 17; j++)
fprintf (file, "%d %d ",
c_tool->curves->points[i][j][0],
c_tool->curves->points[i][j][1]);
fprintf (file, "\n");
}
}
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