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gimp/app/tools/gimpcurvestool.c
Michael Natterer 002aa905db app/Makefile.am app/gimphelp.[ch] new files 
1999-09-27  Michael Natterer  <mitch@gimp.org>

	* app/Makefile.am
	* app/gimphelp.[ch]
	* app/gimpui.[ch]: new files

	* app/interface.[ch]
	* app/preferences_dialog.[ch]

	The GIMP Help System part 1: Press "F1" in any dialog to pop up
	the help page for this dialog.

	Moved the widget constructors from preferences_dialog.[ch] and the
	query boxes from interface.[ch] to gimpui.[ch].

	The dialog constructors take a help_func and a help_data
	parameter and install the "F1" accelerator which emits the new
	"help" signal.

	The "help" signal callback calls help_func(help_data) which finally
	has to call gimp_help() which in turn invokes the help browser.

	Still have to find a proper way to (1) prevent "F1" being assigned
	to some menu item and (2) to catch "F1" while browsing the menu
	trees in order to pop up the help for the selected item.

	* app/menus.c: a <Toolbox>/File/Help... menu item.
	* app/commands.[ch]: a command callback for the "Help..." menu item.

	* app/gimprc.[ch]: new boolean gimprc variable "use_help".

	* app/info_dialog.[ch]: pass a help function and data to the info
	dialog constructor.

	* app/tools.[ch]: store the tools help page names in the tool info
	structure. Export a special tools_help_func() which shows the help
	page for the active tool.

	* app/[all files calling a dialog constructor]: pass the dialog's
	help page to the constructor.

	Most dialogs are now created by gimp_dialog_new() which also sets
	up the action_area and the WM delete event callback, so I removed
	the resp. code from these files.

	Fixed some minor bugs and did some other stuff but didn't change
	any logic except dialog creation.

	* plug-ins/helpbrowser/helpbrowser.c: don't try to call a running
	help browser and don't install any menu path (all done in
	app/gimphelp.[ch] now).
1999-09-27 17:58:10 +00:00

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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 <stdlib.h>
#include <string.h>
#include "appenv.h"
#include "buildmenu.h"
#include "colormaps.h"
#include "cursorutil.h"
#include "drawable.h"
#include "general.h"
#include "gdisplay.h"
#include "gimphistogram.h"
#include "gimpui.h"
#include "interface.h"
#include "curves.h"
#include "gimplut.h"
#include "libgimp/gimpintl.h"
#include "libgimp/gimpmath.h"
#define GRAPH 0x1
#define XRANGE_TOP 0x2
#define XRANGE_BOTTOM 0x4
#define YRANGE 0x8
#define DRAW 0x10
#define ALL 0xFF
/* NB: take care when changing these values: make sure the curve[] array in
* 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 RANGE_MASK GDK_EXPOSURE_MASK | \
GDK_ENTER_NOTIFY_MASK
#define GRAPH_MASK GDK_EXPOSURE_MASK | \
GDK_POINTER_MOTION_MASK | \
GDK_POINTER_MOTION_HINT_MASK | \
GDK_ENTER_NOTIFY_MASK | \
GDK_BUTTON_PRESS_MASK | \
GDK_BUTTON_RELEASE_MASK | \
GDK_BUTTON1_MOTION_MASK
/* the curves structures */
typedef struct _Curves Curves;
struct _Curves
{
int x, y; /* coords for last mouse click */
};
typedef double CRMatrix[4][4];
/* the curves tool options */
static ToolOptions * curves_options = NULL;
/* the curves dialog */
static CurvesDialog * curves_dialog = NULL;
static CRMatrix CR_basis =
{
{ -0.5, 1.5, -1.5, 0.5 },
{ 1.0, -2.5, 2.0, -0.5 },
{ -0.5, 0.0, 0.5, 0.0 },
{ 0.0, 1.0, 0.0, 0.0 },
};
/* curves action functions */
static void curves_button_press (Tool *, GdkEventButton *, gpointer);
static void curves_button_release (Tool *, GdkEventButton *, gpointer);
static void curves_motion (Tool *, GdkEventMotion *, gpointer);
static void curves_control (Tool *, ToolAction, gpointer);
static CurvesDialog * curves_new_dialog (void);
static void curves_update (CurvesDialog *, int);
static void curves_plot_curve (CurvesDialog *, int, int, int, int);
static void curves_preview (CurvesDialog *);
static void curves_value_callback (GtkWidget *, gpointer);
static void curves_red_callback (GtkWidget *, gpointer);
static void curves_green_callback (GtkWidget *, gpointer);
static void curves_blue_callback (GtkWidget *, gpointer);
static void curves_alpha_callback (GtkWidget *, gpointer);
static void curves_smooth_callback (GtkWidget *, gpointer);
static void curves_free_callback (GtkWidget *, gpointer);
static void curves_reset_callback (GtkWidget *, gpointer);
static void curves_ok_callback (GtkWidget *, gpointer);
static void curves_cancel_callback (GtkWidget *, gpointer);
static void curves_preview_update (GtkWidget *, gpointer);
static gint curves_xrange_events (GtkWidget *, GdkEvent *, CurvesDialog *);
static gint curves_yrange_events (GtkWidget *, GdkEvent *, CurvesDialog *);
static gint curves_graph_events (GtkWidget *, GdkEvent *, CurvesDialog *);
static void curves_CR_compose (CRMatrix, CRMatrix, CRMatrix);
/* curves machinery */
float
curves_lut_func (CurvesDialog *cd,
int nchannels, int channel, float value)
{
float f;
int index;
double inten;
int j;
if (nchannels == 1)
j = 0;
else
j = channel + 1;
inten = value;
/* For color images this runs through the loop with j = channel +1
the first time and j = 0 the second time */
/* For bw images this runs through the loop with j = 0 the first and
only time */
for (; j >= 0; j -= (channel + 1))
{
/* don't apply the overall curve to the alpha channel */
if (j == 0 && (nchannels == 2 || nchannels == 4)
&& channel == nchannels -1)
return inten;
if (inten < 0.0)
inten = cd->curve[j][0]/255.0;
else if (inten >= 1.0)
inten = cd->curve[j][255]/255.0;
else /* interpolate the curve */
{
index = floor(inten * 255.0);
f = inten*255.0 - index;
inten = ((1.0 - f) * cd->curve[j][index ] +
( f) * cd->curve[j][index + 1] ) / 255.0;
}
}
return inten;
}
static void
curves_colour_update (Tool *tool,
GDisplay *gdisp,
GimpDrawable *drawable,
gint x,
gint y)
{
unsigned char *color;
int offx, offy;
int has_alpha;
int is_indexed;
int sample_type;
int maxval;
if(!tool || tool->state != ACTIVE)
return;
drawable_offsets (drawable, &offx, &offy);
x -= offx;
y -= offy;
if (!(color = image_map_get_color_at(curves_dialog->image_map, x, y)))
return;
sample_type = gimp_drawable_type(drawable);
is_indexed = gimp_drawable_indexed (drawable);
has_alpha = TYPE_HAS_ALPHA(sample_type);
curves_dialog->col_value[HISTOGRAM_RED] = color[RED_PIX];
curves_dialog->col_value[HISTOGRAM_GREEN] = color[GREEN_PIX];
curves_dialog->col_value[HISTOGRAM_BLUE] = color[BLUE_PIX];
if (has_alpha)
{
curves_dialog->col_value [HISTOGRAM_ALPHA] = color[3];
}
if (is_indexed)
curves_dialog->col_value [HISTOGRAM_ALPHA] = color[4];
maxval = MAXIMUM(color[RED_PIX],color[GREEN_PIX]);
curves_dialog->col_value[HISTOGRAM_VALUE] = MAXIMUM(maxval,color[BLUE_PIX]);
g_free(color);
}
static void
curves_add_point(GimpDrawable * drawable,gint x, gint y,gint cchan)
{
/* Add point onto the curve */
int closest_point = 0;
int distance;
int curvex;
int i;
switch (curves_dialog->curve_type)
{
case SMOOTH:
curvex = curves_dialog->col_value[cchan];
distance = G_MAXINT;
for (i = 0; i < 17; i++)
{
if (curves_dialog->points[cchan][i][0] != -1)
if (abs (curvex - curves_dialog->points[cchan][i][0]) < distance)
{
distance = abs (curvex - curves_dialog->points[cchan][i][0]);
closest_point = i;
}
}
if (distance > MIN_DISTANCE)
closest_point = (curvex + 8) / 16;
curves_dialog->points[cchan][closest_point][0] = curvex;
curves_dialog->points[cchan][closest_point][1] = curves_dialog->curve[cchan][curvex];
break;
case GFREE:
curves_dialog->curve[cchan][x] = 255 - y;
break;
}
}
/* curves action functions */
static void
curves_button_press (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
GDisplay *gdisp;
gint x, y;
GimpDrawable * drawable;
gdisp = gdisp_ptr;
drawable = gimage_active_drawable (gdisp->gimage);
tool->gdisp_ptr = gdisp;
if (drawable != tool->drawable)
{
active_tool->preserve = TRUE;
image_map_abort (curves_dialog->image_map);
active_tool->preserve = FALSE;
tool->drawable = drawable;
curves_dialog->drawable = drawable;
curves_dialog->color = drawable_color (drawable);
curves_dialog->image_map = image_map_create (gdisp, drawable);
}
tool->state = ACTIVE;
gdisplay_untransform_coords (gdisp, bevent->x, bevent->y, &x, &y,
FALSE, FALSE);
curves_colour_update (tool, gdisp, drawable, x, y);
curves_update (curves_dialog, GRAPH | DRAW);
}
static void
curves_button_release (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
gint x, y;
GimpDrawable * drawable;
GDisplay *gdisp;
gdisp = (GDisplay *) gdisp_ptr;
if(!curves_dialog ||
!gdisp ||
!(drawable = gimage_active_drawable (gdisp->gimage)))
return;
gdisplay_untransform_coords (gdisp, bevent->x, bevent->y, &x, &y, FALSE, FALSE);
curves_colour_update(tool,gdisp,drawable,x,y);
if(bevent->state & GDK_SHIFT_MASK)
{
curves_add_point(drawable,x,y,curves_dialog->channel);
curves_calculate_curve(curves_dialog);
}
else if(bevent->state & GDK_CONTROL_MASK)
{
curves_add_point(drawable,x,y,HISTOGRAM_VALUE);
curves_add_point(drawable,x,y,HISTOGRAM_RED);
curves_add_point(drawable,x,y,HISTOGRAM_GREEN);
curves_add_point(drawable,x,y,HISTOGRAM_BLUE);
curves_add_point(drawable,x,y,HISTOGRAM_ALPHA);
curves_calculate_curve(curves_dialog);
}
curves_update (curves_dialog, GRAPH | DRAW);
}
static void
curves_motion (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
GDisplay *gdisp;
gint x, y;
GimpDrawable * drawable;
gdisp = (GDisplay *) gdisp_ptr;
if(!curves_dialog ||
!gdisp ||
!(drawable = gimage_active_drawable (gdisp->gimage)))
return;
gdisplay_untransform_coords (gdisp, mevent->x, mevent->y, &x, &y, FALSE, FALSE);
curves_colour_update(tool,gdisp,drawable,x,y);
curves_update (curves_dialog, GRAPH | DRAW);
}
static void
curves_control (Tool *tool,
ToolAction action,
gpointer gdisp_ptr)
{
switch (action)
{
case PAUSE:
break;
case RESUME:
break;
case HALT:
if (curves_dialog)
curves_cancel_callback (NULL, (gpointer) curves_dialog);
break;
default:
break;
}
}
Tool *
tools_new_curves ()
{
Tool * tool;
Curves * private;
/* The tool options */
if (!curves_options)
{
curves_options = tool_options_new (_("Curves Options"));
tools_register (CURVES, curves_options);
}
tool = tools_new_tool (CURVES);
private = g_new (Curves, 1);
tool->scroll_lock = TRUE; /* Disallow scrolling */
tool->preserve = FALSE; /* Don't preserve on drawable change */
tool->private = (void *) private;
tool->button_press_func = curves_button_press;
tool->button_release_func = curves_button_release;
tool->motion_func = curves_motion;
tool->control_func = curves_control;
return tool;
}
void
tools_free_curves (Tool *tool)
{
Curves * _curves;
_curves = (Curves *) tool->private;
/* Close the color select dialog */
if (curves_dialog)
curves_cancel_callback (NULL, (gpointer) curves_dialog);
g_free (_curves);
}
static MenuItem channel_items[] =
{
{ N_("Value"), 0, 0, curves_value_callback, NULL, NULL, NULL },
{ N_("Red"), 0, 0, curves_red_callback, NULL, NULL, NULL },
{ N_("Green"), 0, 0, curves_green_callback, NULL, NULL, NULL },
{ N_("Blue"), 0, 0, curves_blue_callback, NULL, NULL, NULL },
{ N_("Alpha"), 0, 0, curves_alpha_callback, NULL, NULL, NULL },
{ NULL, 0, 0, NULL, NULL, NULL, NULL }
};
void
curves_initialize (GDisplay *gdisp)
{
int i, j;
if (drawable_indexed (gimage_active_drawable (gdisp->gimage)))
{
g_message (_("Curves for indexed drawables cannot be adjusted."));
return;
}
/* The curves dialog */
if (!curves_dialog)
curves_dialog = curves_new_dialog ();
/* Initialize the values */
curves_dialog->channel = HISTOGRAM_VALUE;
for (i = 0; i < 5; i++)
for (j = 0; j < 256; j++)
curves_dialog->curve[i][j] = j;
curves_dialog->grab_point = -1;
for (i = 0; i < 5; i++)
{
for (j = 0; j < 17; j++)
{
curves_dialog->points[i][j][0] = -1;
curves_dialog->points[i][j][1] = -1;
}
curves_dialog->points[i][0][0] = 0;
curves_dialog->points[i][0][1] = 0;
curves_dialog->points[i][16][0] = 255;
curves_dialog->points[i][16][1] = 255;
}
curves_dialog->drawable = gimage_active_drawable (gdisp->gimage);
curves_dialog->color = drawable_color ( (curves_dialog->drawable));
curves_dialog->image_map = image_map_create (gdisp, curves_dialog->drawable);
/* check for alpha channel */
if (drawable_has_alpha ( (curves_dialog->drawable)))
gtk_widget_set_sensitive( channel_items[4].widget, TRUE);
else
gtk_widget_set_sensitive( channel_items[4].widget, FALSE);
/* hide or show the channel menu based on image type */
if (curves_dialog->color)
for (i = 0; i < 4; i++)
gtk_widget_set_sensitive( channel_items[i].widget, TRUE);
else
for (i = 1; i < 4; i++)
gtk_widget_set_sensitive( channel_items[i].widget, FALSE);
/* set the current selection */
gtk_option_menu_set_history (GTK_OPTION_MENU (curves_dialog->channel_menu), 0);
if (!GTK_WIDGET_VISIBLE (curves_dialog->shell))
gtk_widget_show (curves_dialog->shell);
curves_update (curves_dialog, GRAPH | DRAW);
}
void
curves_free ()
{
if (curves_dialog)
{
if (curves_dialog->image_map)
{
active_tool->preserve = TRUE;
image_map_abort (curves_dialog->image_map);
active_tool->preserve = FALSE;
curves_dialog->image_map = NULL;
}
if (curves_dialog->pixmap)
gdk_pixmap_unref (curves_dialog->pixmap);
gtk_widget_destroy (curves_dialog->shell);
}
}
/*******************/
/* Curves dialog */
/*******************/
static CurvesDialog *
curves_new_dialog ()
{
CurvesDialog *cd;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *label;
GtkWidget *frame;
GtkWidget *toggle;
GtkWidget *option_menu;
GtkWidget *channel_hbox;
GtkWidget *menu;
GtkWidget *table;
gint i, j;
static MenuItem curve_type_items[] =
{
{ N_("Smooth"), 0, 0, curves_smooth_callback, NULL, NULL, NULL },
{ N_("Free"), 0, 0, curves_free_callback, NULL, NULL, NULL },
{ NULL, 0, 0, NULL, NULL, NULL, NULL }
};
cd = g_new (CurvesDialog, 1);
cd->cursor_ind_height = cd->cursor_ind_width = -1;
cd->preview = TRUE;
cd->curve_type = SMOOTH;
cd->pixmap = NULL;
cd->channel = HISTOGRAM_VALUE;
for (i = 0; i < 5; i++)
for (j = 0; j < 256; j++)
cd->curve[i][j] = j;
for(i = 0; i < (sizeof(cd->col_value)/sizeof(cd->col_value[0])); i++)
cd->col_value[i] = 0;
cd->lut = gimp_lut_new();
for (i = 0; i < 5; i++)
channel_items [i].user_data = (gpointer) cd;
for (i = 0; i < 2; i++)
curve_type_items [i].user_data = (gpointer) cd;
/* The shell and main vbox */
cd->shell = gimp_dialog_new (_("Curves"), "curves",
tools_help_func, NULL,
GTK_WIN_POS_NONE,
FALSE, TRUE, FALSE,
_("Reset"), curves_reset_callback,
cd, NULL, FALSE, FALSE,
_("OK"), curves_ok_callback,
cd, NULL, TRUE, FALSE,
_("Cancel"), curves_cancel_callback,
cd, NULL, FALSE, TRUE,
NULL);
vbox = gtk_vbox_new (FALSE, 2);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 2);
gtk_container_add (GTK_CONTAINER (GTK_DIALOG (cd->shell)->vbox), vbox);
/* The option menu for selecting channels */
channel_hbox = gtk_hbox_new (FALSE, 2);
gtk_box_pack_start (GTK_BOX (vbox), channel_hbox, FALSE, FALSE, 0);
label = gtk_label_new (_("Modify Curves for Channel: "));
gtk_box_pack_start (GTK_BOX (channel_hbox), label, FALSE, FALSE, 0);
menu = build_menu (channel_items, NULL);
cd->channel_menu = gtk_option_menu_new ();
gtk_box_pack_start (GTK_BOX (channel_hbox), cd->channel_menu, FALSE, FALSE, 2);
gtk_widget_show (label);
gtk_widget_show (cd->channel_menu);
gtk_widget_show (channel_hbox);
gtk_option_menu_set_menu (GTK_OPTION_MENU (cd->channel_menu), menu);
/* The table for the yrange and the graph */
table = gtk_table_new (2, 2, FALSE);
gtk_container_set_border_width (GTK_CONTAINER (table), 2);
gtk_box_pack_start (GTK_BOX (vbox), table, FALSE, FALSE, 0);
/* The range drawing area */
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_table_attach (GTK_TABLE (table), frame, 0, 1, 0, 1,
GTK_EXPAND, GTK_EXPAND, 0, 0);
cd->yrange = gtk_preview_new (GTK_PREVIEW_COLOR);
gtk_preview_size (GTK_PREVIEW (cd->yrange), YRANGE_WIDTH, YRANGE_HEIGHT);
gtk_widget_set_events (cd->yrange, RANGE_MASK);
gtk_signal_connect (GTK_OBJECT (cd->yrange), "event",
(GtkSignalFunc) curves_yrange_events,
cd);
gtk_container_add (GTK_CONTAINER (frame), cd->yrange);
gtk_widget_show (cd->yrange);
gtk_widget_show (frame);
/* The curves graph */
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_table_attach (GTK_TABLE (table), frame, 1, 2, 0, 1,
GTK_EXPAND | GTK_SHRINK | GTK_FILL,
GTK_FILL, 0, 0);
cd->graph = gtk_drawing_area_new ();
gtk_drawing_area_size (GTK_DRAWING_AREA (cd->graph),
GRAPH_WIDTH + RADIUS * 2,
GRAPH_HEIGHT + RADIUS * 2);
gtk_widget_set_events (cd->graph, GRAPH_MASK);
gtk_signal_connect (GTK_OBJECT (cd->graph), "event",
(GtkSignalFunc) curves_graph_events,
cd);
gtk_container_add (GTK_CONTAINER (frame), cd->graph);
gtk_widget_show (cd->graph);
gtk_widget_show (frame);
/* The range drawing area */
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_table_attach (GTK_TABLE (table), frame, 1, 2, 1, 2,
GTK_EXPAND, GTK_EXPAND, 0, 0);
cd->xrange = gtk_preview_new (GTK_PREVIEW_COLOR);
gtk_preview_size (GTK_PREVIEW (cd->xrange), XRANGE_WIDTH, XRANGE_HEIGHT);
gtk_widget_set_events (cd->xrange, RANGE_MASK);
gtk_signal_connect (GTK_OBJECT (cd->xrange), "event",
(GtkSignalFunc) curves_xrange_events,
cd);
gtk_container_add (GTK_CONTAINER (frame), cd->xrange);
gtk_widget_show (cd->xrange);
gtk_widget_show (frame);
gtk_widget_show (table);
/* Horizontal box for preview */
hbox = gtk_hbox_new (FALSE, 2);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
/* The option menu for selecting the drawing method */
label = gtk_label_new (_("Curve Type: "));
gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
menu = build_menu (curve_type_items, NULL);
option_menu = gtk_option_menu_new ();
gtk_box_pack_start (GTK_BOX (hbox), option_menu, FALSE, FALSE, 2);
gtk_widget_show (label);
gtk_widget_show (option_menu);
gtk_widget_show (hbox);
gtk_option_menu_set_menu (GTK_OPTION_MENU (option_menu), menu);
/* The preview toggle */
toggle = gtk_check_button_new_with_label (_("Preview"));
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), cd->preview);
gtk_box_pack_start (GTK_BOX (hbox), toggle, TRUE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
(GtkSignalFunc) curves_preview_update,
cd);
gtk_widget_show (label);
gtk_widget_show (toggle);
gtk_widget_show (hbox);
gtk_widget_show (vbox);
return cd;
}
static void
curve_print_loc(CurvesDialog *cd,
gint xpos,
gint ypos)
{
char buf[32];
gint width;
gint ascent;
gint descent;
if(cd->cursor_ind_width < 0)
{
/* Calc max extents */
gdk_string_extents(cd->graph->style->font,
"x:888 y:888",
NULL,
NULL,
&width,
&ascent,
&descent);
cd->cursor_ind_width = width;
cd->cursor_ind_height = ascent + descent;
cd->cursor_ind_ascent = ascent;
}
if(xpos >= 0 && xpos <= 255 && ypos >=0 && ypos <= 255)
{
g_snprintf (buf, sizeof (buf), "x:%d y:%d",xpos,ypos);
gdk_draw_rectangle (cd->graph->window,
cd->graph->style->bg_gc[GTK_STATE_ACTIVE],
TRUE, RADIUS*2 + 2 , RADIUS*2 + 2,
cd->cursor_ind_width+4,
cd->cursor_ind_height+5);
gdk_draw_rectangle (cd->graph->window,
cd->graph->style->black_gc,
FALSE, RADIUS*2 + 2 , RADIUS*2 + 2,
cd->cursor_ind_width+3,
cd->cursor_ind_height+4);
gdk_draw_string (cd->graph->window,
cd->graph->style->font,
cd->graph->style->black_gc,
RADIUS*2 + 4,
RADIUS*2 + 5 + cd->cursor_ind_ascent,
buf);
}
}
/* TODO: preview alpha channel stuff correctly. -- austin, 20/May/99 */
static void
curves_update (CurvesDialog *cd,
int update)
{
GdkRectangle area;
int i, j;
char buf[32];
gint offset;
if (update & XRANGE_TOP)
{
unsigned char buf[XRANGE_WIDTH * 3];
switch (cd->channel) {
case HISTOGRAM_VALUE:
case HISTOGRAM_ALPHA:
for (i = 0; i < XRANGE_HEIGHT / 2; i++)
{
for (j = 0; j < XRANGE_WIDTH ; j++)
{
buf[j*3+0] = cd->curve[cd->channel][j];
buf[j*3+1] = cd->curve[cd->channel][j];
buf[j*3+2] = cd->curve[cd->channel][j];
}
gtk_preview_draw_row (GTK_PREVIEW (cd->xrange),
buf, 0, i, XRANGE_WIDTH);
}
break;
case HISTOGRAM_RED:
case HISTOGRAM_GREEN:
case HISTOGRAM_BLUE:
{
for (i = 0; i < XRANGE_HEIGHT / 2; i++)
{
for (j = 0; j < XRANGE_WIDTH; j++)
{
buf[j*3+0] = cd->curve[HISTOGRAM_RED][j];
buf[j*3+1] = cd->curve[HISTOGRAM_GREEN][j];
buf[j*3+2] = cd->curve[HISTOGRAM_BLUE][j];
}
gtk_preview_draw_row (GTK_PREVIEW (cd->xrange),
buf, 0, i, XRANGE_WIDTH);
}
break;
}
default:
g_warning ("unknown channel type %d, can't happen!?!?",
cd->channel);
break;
} /* end switch */
if (update & DRAW)
{
area.x = 0;
area.y = 0;
area.width = XRANGE_WIDTH;
area.height = XRANGE_HEIGHT / 2;
gtk_widget_draw (cd->xrange, &area);
}
}
if (update & XRANGE_BOTTOM)
{
unsigned char 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 (cd->xrange), buf, 0, i, XRANGE_WIDTH);
if (update & DRAW)
{
area.x = 0;
area.y = XRANGE_HEIGHT / 2;
area.width = XRANGE_WIDTH;
area.height = XRANGE_HEIGHT / 2;
gtk_widget_draw (cd->xrange, &area);
}
}
if (update & YRANGE)
{
unsigned char buf[YRANGE_WIDTH * 3];
unsigned char pix[3];
for (i = 0; i < YRANGE_HEIGHT; i++)
{
switch (cd->channel) {
case HISTOGRAM_VALUE:
case HISTOGRAM_ALPHA:
pix[0] = pix[1] = pix[2] = (255 - i);
break;
case HISTOGRAM_RED:
case HISTOGRAM_GREEN:
case HISTOGRAM_BLUE:
pix[0] = pix[1] = pix[2] = 0;
pix[cd->channel - 1] = (255 - i);
break;
default:
g_warning ("unknown channel type %d, can't happen!?!?",
cd->channel);
break;
}
for (j = 0; j < YRANGE_WIDTH * 3; j++)
buf[j] = pix[j%3];
gtk_preview_draw_row (GTK_PREVIEW (cd->yrange), buf, 0, i, YRANGE_WIDTH);
}
if (update & DRAW)
gtk_widget_draw (cd->yrange, NULL);
}
if ((update & GRAPH) && (update & DRAW) && cd->pixmap != NULL)
{
GdkPoint points[256];
/* Clear the pixmap */
gdk_draw_rectangle (cd->pixmap, cd->graph->style->bg_gc[GTK_STATE_NORMAL],
TRUE, 0, 0, GRAPH_WIDTH + RADIUS * 2, GRAPH_HEIGHT + RADIUS * 2);
/* Draw the grid lines */
for (i = 0; i < 5; i++)
{
gdk_draw_line (cd->pixmap, cd->graph->style->dark_gc[GTK_STATE_NORMAL],
RADIUS, i * (GRAPH_HEIGHT / 4) + RADIUS,
GRAPH_WIDTH + RADIUS, i * (GRAPH_HEIGHT / 4) + RADIUS);
gdk_draw_line (cd->pixmap, cd->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 - cd->curve[cd->channel][i] + RADIUS;
}
gdk_draw_points (cd->pixmap, cd->graph->style->black_gc, points, 256);
/* Draw the points */
if (cd->curve_type == SMOOTH)
for (i = 0; i < 17; i++)
{
if (cd->points[cd->channel][i][0] != -1)
gdk_draw_arc (cd->pixmap, cd->graph->style->black_gc, TRUE,
cd->points[cd->channel][i][0],
255 - cd->points[cd->channel][i][1],
RADIUS * 2, RADIUS * 2, 0, 23040);
}
/* draw the colour line */
gdk_draw_line(cd->pixmap, cd->graph->style->black_gc,
cd->col_value[cd->channel]+RADIUS,RADIUS,
cd->col_value[cd->channel]+RADIUS,GRAPH_HEIGHT + RADIUS);
/* and xpos indicator */
g_snprintf (buf, sizeof (buf), "x:%d",cd->col_value[cd->channel]);
if((cd->col_value[cd->channel]+RADIUS) < 127)
{
offset = RADIUS + 4;
}
else
{
offset = -gdk_string_width(cd->graph->style->font,buf) - 2;
}
gdk_draw_string (cd->pixmap,
cd->graph->style->font,
cd->graph->style->black_gc,
cd->col_value[cd->channel]+offset,
GRAPH_HEIGHT,
buf);
gdk_draw_pixmap (cd->graph->window, cd->graph->style->black_gc, cd->pixmap,
0, 0, 0, 0, GRAPH_WIDTH + RADIUS * 2, GRAPH_HEIGHT + RADIUS * 2);
}
}
static void
curves_plot_curve (CurvesDialog *cd,
int p1,
int p2,
int p3,
int p4)
{
CRMatrix geometry;
CRMatrix tmp1, tmp2;
CRMatrix deltas;
double x, dx, dx2, dx3;
double y, dy, dy2, dy3;
double d, d2, d3;
int lastx, lasty;
gint32 newx, newy;
int i;
/* construct the geometry matrix from the segment */
for (i = 0; i < 4; i++)
{
geometry[i][2] = 0;
geometry[i][3] = 0;
}
for (i = 0; i < 2; i++)
{
geometry[0][i] = cd->points[cd->channel][p1][i];
geometry[1][i] = cd->points[cd->channel][p2][i];
geometry[2][i] = cd->points[cd->channel][p3][i];
geometry[3][i] = cd->points[cd->channel][p4][i];
}
/* subdivide the curve 1000 times */
/* n can be adjusted to give a finer or coarser curve */
d = 1.0 / 1000;
d2 = d * d;
d3 = d * d * d;
/* construct a temporary matrix for determining the forward differencing deltas */
tmp2[0][0] = 0; tmp2[0][1] = 0; tmp2[0][2] = 0; tmp2[0][3] = 1;
tmp2[1][0] = d3; tmp2[1][1] = d2; tmp2[1][2] = d; tmp2[1][3] = 0;
tmp2[2][0] = 6*d3; tmp2[2][1] = 2*d2; tmp2[2][2] = 0; tmp2[2][3] = 0;
tmp2[3][0] = 6*d3; tmp2[3][1] = 0; tmp2[3][2] = 0; tmp2[3][3] = 0;
/* compose the basis and geometry matrices */
curves_CR_compose (CR_basis, geometry, tmp1);
/* compose the above results to get the deltas matrix */
curves_CR_compose (tmp2, tmp1, deltas);
/* extract the x deltas */
x = deltas[0][0];
dx = deltas[1][0];
dx2 = deltas[2][0];
dx3 = deltas[3][0];
/* extract the y deltas */
y = deltas[0][1];
dy = deltas[1][1];
dy2 = deltas[2][1];
dy3 = deltas[3][1];
lastx = BOUNDS (x, 0, 255);
lasty = BOUNDS (y, 0, 255);
cd->curve[cd->channel][lastx] = lasty;
/* loop over the curve */
for (i = 0; i < 1000; i++)
{
/* increment the x values */
x += dx;
dx += dx2;
dx2 += dx3;
/* increment the y values */
y += dy;
dy += dy2;
dy2 += dy3;
newx = CLAMP0255 (ROUND (x));
newy = CLAMP0255 (ROUND (y));
/* if this point is different than the last one...then draw it */
if ((lastx != newx) || (lasty != newy))
cd->curve[cd->channel][newx] = newy;
lastx = newx;
lasty = newy;
}
}
void
curves_calculate_curve (CurvesDialog *cd)
{
int i;
int points[17];
int num_pts;
int p1, p2, p3, p4;
switch (cd->curve_type)
{
case GFREE:
break;
case SMOOTH:
/* cycle through the curves */
num_pts = 0;
for (i = 0; i < 17; i++)
if (cd->points[cd->channel][i][0] != -1)
points[num_pts++] = i;
/* Initialize boundary curve points */
if (num_pts != 0)
{
for (i = 0; i < cd->points[cd->channel][points[0]][0]; i++)
cd->curve[cd->channel][i] = cd->points[cd->channel][points[0]][1];
for (i = cd->points[cd->channel][points[num_pts - 1]][0]; i < 256; i++)
cd->curve[cd->channel][i] = cd->points[cd->channel][points[num_pts - 1]][1];
}
for (i = 0; i < num_pts - 1; i++)
{
p1 = (i == 0) ? points[i] : points[(i - 1)];
p2 = points[i];
p3 = points[(i + 1)];
p4 = (i == (num_pts - 2)) ? points[(num_pts - 1)] : points[(i + 2)];
curves_plot_curve (cd, p1, p2, p3, p4);
}
break;
}
gimp_lut_setup(cd->lut, (GimpLutFunc) curves_lut_func,
(void *) cd, gimp_drawable_bytes(cd->drawable));
}
static void
curves_preview (CurvesDialog *cd)
{
if (!cd->image_map)
g_message ("curves_preview(): No image map");
active_tool->preserve = TRUE; /* Going to dirty the display... */
image_map_apply (cd->image_map, (ImageMapApplyFunc)gimp_lut_process_2,
(void *) cd->lut);
active_tool->preserve = FALSE; /* All done */
}
static void
curves_value_callback (GtkWidget *w,
gpointer client_data)
{
CurvesDialog *cd;
cd = (CurvesDialog *) client_data;
if (cd->channel != HISTOGRAM_VALUE)
{
cd->channel = HISTOGRAM_VALUE;
curves_update (cd, XRANGE_TOP | YRANGE | GRAPH | DRAW);
}
}
static void
curves_red_callback (GtkWidget *w,
gpointer client_data)
{
CurvesDialog *cd;
cd = (CurvesDialog *) client_data;
if (cd->channel != HISTOGRAM_RED)
{
cd->channel = HISTOGRAM_RED;
curves_update (cd, XRANGE_TOP | YRANGE | GRAPH | DRAW);
}
}
static void
curves_green_callback (GtkWidget *w,
gpointer client_data)
{
CurvesDialog *cd;
cd = (CurvesDialog *) client_data;
if (cd->channel != HISTOGRAM_GREEN)
{
cd->channel = HISTOGRAM_GREEN;
curves_update (cd, XRANGE_TOP | YRANGE | GRAPH | DRAW);
}
}
static void
curves_blue_callback (GtkWidget *w,
gpointer client_data)
{
CurvesDialog *cd;
cd = (CurvesDialog *) client_data;
if (cd->channel != HISTOGRAM_BLUE)
{
cd->channel = HISTOGRAM_BLUE;
curves_update (cd, XRANGE_TOP | YRANGE | GRAPH | DRAW);
}
}
static void
curves_alpha_callback (GtkWidget *w,
gpointer client_data)
{
CurvesDialog *cd;
cd = (CurvesDialog *) client_data;
if (cd->channel != HISTOGRAM_ALPHA)
{
cd->channel = HISTOGRAM_ALPHA;
curves_update (cd, XRANGE_TOP | YRANGE | GRAPH | DRAW);
}
}
static void
curves_smooth_callback (GtkWidget *w,
gpointer client_data)
{
CurvesDialog *cd;
int i;
gint32 index;
cd = (CurvesDialog *) client_data;
if (cd->curve_type != SMOOTH)
{
cd->curve_type = SMOOTH;
/* pick representative points from the curve and make them control points */
for (i = 0; i <= 8; i++)
{
index = CLAMP0255 (i * 32);
cd->points[cd->channel][i * 2][0] = index;
cd->points[cd->channel][i * 2][1] = cd->curve[cd->channel][index];
}
curves_calculate_curve (cd);
curves_update (cd, GRAPH | DRAW);
if (cd->preview)
curves_preview (cd);
}
}
static void
curves_free_callback (GtkWidget *w,
gpointer client_data)
{
CurvesDialog *cd;
cd = (CurvesDialog *) client_data;
if (cd->curve_type != GFREE)
{
cd->curve_type = GFREE;
curves_calculate_curve (cd);
curves_update (cd, GRAPH | DRAW);
if (cd->preview)
curves_preview (cd);
}
}
static void
curves_reset_callback (GtkWidget *widget,
gpointer client_data)
{
CurvesDialog *cd;
int i;
cd = (CurvesDialog *) client_data;
/* Initialize the values */
for (i = 0; i < 256; i++)
cd->curve[cd->channel][i] = i;
cd->grab_point = -1;
for (i = 0; i < 17; i++)
{
cd->points[cd->channel][i][0] = -1;
cd->points[cd->channel][i][1] = -1;
}
cd->points[cd->channel][0][0] = 0;
cd->points[cd->channel][0][1] = 0;
cd->points[cd->channel][16][0] = 255;
cd->points[cd->channel][16][1] = 255;
curves_calculate_curve (cd);
curves_update (cd, GRAPH | XRANGE_TOP | DRAW);
if (cd->preview)
curves_preview (cd);
}
static void
curves_ok_callback (GtkWidget *widget,
gpointer client_data)
{
CurvesDialog *cd;
cd = (CurvesDialog *) client_data;
if (GTK_WIDGET_VISIBLE (cd->shell))
gtk_widget_hide (cd->shell);
active_tool->preserve = TRUE; /* We're about to dirty... */
if (!cd->preview)
image_map_apply (cd->image_map, (ImageMapApplyFunc)gimp_lut_process_2,
(void *) cd->lut);
if (cd->image_map)
image_map_commit (cd->image_map);
active_tool->preserve = FALSE;
cd->image_map = NULL;
active_tool->gdisp_ptr = NULL;
active_tool->drawable = NULL;
}
static void
curves_cancel_callback (GtkWidget *widget,
gpointer client_data)
{
CurvesDialog *cd;
cd = (CurvesDialog *) client_data;
if (GTK_WIDGET_VISIBLE (cd->shell))
gtk_widget_hide (cd->shell);
if (cd->image_map)
{
active_tool->preserve = TRUE;
image_map_abort (cd->image_map);
active_tool->preserve = FALSE;
gdisplays_flush ();
cd->image_map = NULL;
}
active_tool->gdisp_ptr = NULL;
active_tool->drawable = NULL;
}
static void
curves_preview_update (GtkWidget *widget,
gpointer data)
{
CurvesDialog *cd;
cd = (CurvesDialog *) data;
if (GTK_TOGGLE_BUTTON (widget)->active)
{
cd->preview = TRUE;
curves_preview (cd);
}
else
cd->preview = FALSE;
}
static gint
curves_graph_events (GtkWidget *widget,
GdkEvent *event,
CurvesDialog *cd)
{
static GdkCursorType cursor_type = GDK_TOP_LEFT_ARROW;
GdkCursorType new_type;
GdkEventButton *bevent;
GdkEventMotion *mevent;
int i;
int tx, ty;
int x, y;
int closest_point;
int distance;
int x1, x2, y1, y2;
new_type = GDK_X_CURSOR;
closest_point = 0;
/* get the pointer position */
gdk_window_get_pointer (cd->graph->window, &tx, &ty, NULL);
x = BOUNDS ((tx - RADIUS), 0, 255);
y = BOUNDS ((ty - RADIUS), 0, 255);
distance = G_MAXINT;
for (i = 0; i < 17; i++)
{
if (cd->points[cd->channel][i][0] != -1)
if (abs (x - cd->points[cd->channel][i][0]) < distance)
{
distance = abs (x - cd->points[cd->channel][i][0]);
closest_point = i;
}
}
if (distance > MIN_DISTANCE)
closest_point = (x + 8) / 16;
switch (event->type)
{
case GDK_EXPOSE:
if (cd->pixmap == NULL)
cd->pixmap = gdk_pixmap_new (cd->graph->window,
GRAPH_WIDTH + RADIUS * 2,
GRAPH_HEIGHT + RADIUS * 2, -1);
curves_update (cd, GRAPH | DRAW);
break;
case GDK_BUTTON_PRESS:
bevent = (GdkEventButton *) event;
new_type = GDK_TCROSS;
switch (cd->curve_type)
{
case SMOOTH:
/* determine the leftmost and rightmost points */
cd->leftmost = -1;
for (i = closest_point - 1; i >= 0; i--)
if (cd->points[cd->channel][i][0] != -1)
{
cd->leftmost = cd->points[cd->channel][i][0];
break;
}
cd->rightmost = 256;
for (i = closest_point + 1; i < 17; i++)
if (cd->points[cd->channel][i][0] != -1)
{
cd->rightmost = cd->points[cd->channel][i][0];
break;
}
cd->grab_point = closest_point;
cd->points[cd->channel][cd->grab_point][0] = x;
cd->points[cd->channel][cd->grab_point][1] = 255 - y;
break;
case GFREE:
cd->curve[cd->channel][x] = 255 - y;
cd->grab_point = x;
cd->last = y;
break;
}
curves_calculate_curve (cd);
curves_update (cd, GRAPH | XRANGE_TOP | DRAW);
gtk_grab_add(widget);
break;
case GDK_BUTTON_RELEASE:
new_type = GDK_FLEUR;
cd->grab_point = -1;
if (cd->preview)
curves_preview (cd);
gtk_grab_remove(widget);
break;
case GDK_MOTION_NOTIFY:
mevent = (GdkEventMotion *) event;
if (mevent->is_hint)
{
mevent->x = tx;
mevent->y = ty;
}
switch (cd->curve_type)
{
case SMOOTH:
/* If no point is grabbed... */
if (cd->grab_point == -1)
{
if (cd->points[cd->channel][closest_point][0] != -1)
new_type = GDK_FLEUR;
else
new_type = GDK_TCROSS;
}
/* Else, drag the grabbed point */
else
{
new_type = GDK_TCROSS;
cd->points[cd->channel][cd->grab_point][0] = -1;
if (x > cd->leftmost && x < cd->rightmost)
{
closest_point = (x + 8) / 16;
if (cd->points[cd->channel][closest_point][0] == -1)
cd->grab_point = closest_point;
cd->points[cd->channel][cd->grab_point][0] = x;
cd->points[cd->channel][cd->grab_point][1] = 255 - y;
}
curves_calculate_curve (cd);
curves_update (cd, GRAPH | XRANGE_TOP | DRAW);
}
break;
case GFREE:
if (cd->grab_point != -1)
{
if (cd->grab_point > x)
{
x1 = x;
x2 = cd->grab_point;
y1 = y;
y2 = cd->last;
}
else
{
x1 = cd->grab_point;
x2 = x;
y1 = cd->last;
y2 = y;
}
if (x2 != x1)
for (i = x1; i <= x2; i++)
cd->curve[cd->channel][i] = 255 - (y1 + ((y2 - y1) * (i - x1)) / (x2 - x1));
else
cd->curve[cd->channel][x] = 255 - y;
cd->grab_point = x;
cd->last = y;
curves_update (cd, GRAPH | XRANGE_TOP | DRAW);
}
if (mevent->state & GDK_BUTTON1_MASK)
new_type = GDK_TCROSS;
else
new_type = GDK_PENCIL;
break;
}
if (new_type != cursor_type)
{
cursor_type = new_type;
change_win_cursor (cd->graph->window, cursor_type);
}
curve_print_loc(cd,x,255-y);
break;
default:
break;
}
return FALSE;
}
static gint
curves_xrange_events (GtkWidget *widget,
GdkEvent *event,
CurvesDialog *cd)
{
switch (event->type)
{
case GDK_EXPOSE:
curves_update (cd, XRANGE_TOP | XRANGE_BOTTOM);
break;
case GDK_DELETE:
break;
default:
break;
}
return FALSE;
}
static gint
curves_yrange_events (GtkWidget *widget,
GdkEvent *event,
CurvesDialog *cd)
{
switch (event->type)
{
case GDK_EXPOSE:
curves_update (cd, YRANGE);
break;
default:
break;
}
return FALSE;
}
static void
curves_CR_compose (CRMatrix a,
CRMatrix b,
CRMatrix ab)
{
int i, j;
for (i = 0; i < 4; i++)
{
for (j = 0; j < 4; j++)
{
ab[i][j] = (a[i][0] * b[0][j] +
a[i][1] * b[1][j] +
a[i][2] * b[2][j] +
a[i][3] * b[3][j]);
}
}
}
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