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gimp/app/tools/histogram_tool.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 "appenv.h"
#include "buildmenu.h"
#include "drawable.h"
#include "gdisplay.h"
#include "gimpui.h"
#include "histogram_tool.h"
#include "image_map.h"
#include "libgimp/gimpintl.h"
#include "libgimp/gimpmath.h"
#define TEXT_WIDTH 45
#define GRADIENT_HEIGHT 15
/* the histogram structures */
typedef struct _HistogramTool HistogramTool;
struct _HistogramTool
{
gint x, y; /* coords for last mouse click */
};
/* the histogram tool options */
static ToolOptions * histogram_tool_options = NULL;
/* the histogram tool dialog */
static HistogramToolDialog * histogram_tool_dialog = NULL;
/* histogram_tool action functions */
static void histogram_tool_control (Tool *, ToolAction, gpointer);
static HistogramToolDialog * histogram_tool_dialog_new (void);
static void histogram_tool_close_callback (GtkWidget *, gpointer);
static void histogram_tool_value_callback (GtkWidget *, gpointer);
static void histogram_tool_red_callback (GtkWidget *, gpointer);
static void histogram_tool_green_callback (GtkWidget *, gpointer);
static void histogram_tool_blue_callback (GtkWidget *, gpointer);
static void histogram_tool_gradient_draw (GtkWidget *, gint);
static void histogram_tool_dialog_update (HistogramToolDialog *, gint, gint);
/* histogram_tool machinery */
void
histogram_tool_histogram_range (HistogramWidget *widget,
gint start,
gint end,
gpointer data)
{
HistogramToolDialog *htd;
gdouble pixels;
gdouble count;
htd = (HistogramToolDialog *) data;
if (htd == NULL || htd->hist == NULL ||
gimp_histogram_nchannels(htd->hist) <= 0)
return;
pixels = gimp_histogram_get_count(htd->hist, 0, 255);
count = gimp_histogram_get_count(htd->hist, start, end);
htd->mean = gimp_histogram_get_mean(htd->hist, htd->channel, start, end);
htd->std_dev = gimp_histogram_get_std_dev(htd->hist, htd->channel,
start, end);
htd->median = gimp_histogram_get_median(htd->hist, htd->channel, start, end);
htd->pixels = pixels;
htd->count = count;
htd->percentile = count / pixels;
if (htd->shell)
histogram_tool_dialog_update (htd, start, end);
}
static void
histogram_tool_dialog_update (HistogramToolDialog *htd,
gint start,
gint end)
{
gchar text[12];
/* mean */
g_snprintf (text, sizeof (text), "%3.1f", htd->mean);
gtk_label_set_text (GTK_LABEL (htd->info_labels[0]), text);
/* std dev */
g_snprintf (text, sizeof (text), "%3.1f", htd->std_dev);
gtk_label_set_text (GTK_LABEL (htd->info_labels[1]), text);
/* median */
g_snprintf (text, sizeof (text), "%3.1f", htd->median);
gtk_label_set_text (GTK_LABEL (htd->info_labels[2]), text);
/* pixels */
g_snprintf (text, sizeof (text), "%8.1f", htd->pixels);
gtk_label_set_text (GTK_LABEL (htd->info_labels[3]), text);
/* intensity */
if (start == end)
g_snprintf (text, sizeof (text), "%d", start);
else
g_snprintf (text, sizeof (text), "%d..%d", start, end);
gtk_label_set_text (GTK_LABEL (htd->info_labels[4]), text);
/* count */
g_snprintf (text, sizeof (text), "%8.1f", htd->count);
gtk_label_set_text (GTK_LABEL (htd->info_labels[5]), text);
/* percentile */
g_snprintf (text, sizeof (text), "%2.2f", htd->percentile * 100);
gtk_label_set_text (GTK_LABEL (htd->info_labels[6]), text);
}
/* histogram_tool action functions */
static void
histogram_tool_control (Tool *tool,
ToolAction action,
gpointer gdisp_ptr)
{
switch (action)
{
case PAUSE:
break;
case RESUME:
break;
case HALT:
if (histogram_tool_dialog)
histogram_tool_close_callback (NULL, (gpointer) histogram_tool_dialog);
break;
default:
break;
}
}
Tool *
tools_new_histogram_tool (void)
{
Tool * tool;
HistogramTool * private;
/* The tool options */
if (! histogram_tool_options)
{
histogram_tool_options = tool_options_new (_("Histogram Options"));
tools_register (HISTOGRAM, histogram_tool_options);
}
tool = tools_new_tool (HISTOGRAM);
private = g_new (HistogramTool, 1);
tool->scroll_lock = TRUE; /* Disallow scrolling */
tool->preserve = FALSE; /* Don't preserve on drawable change */
tool->private = (void *) private;
tool->control_func = histogram_tool_control;
return tool;
}
void
tools_free_histogram_tool (Tool *tool)
{
HistogramTool * hist;
hist = (HistogramTool *) tool->private;
/* Close the histogram dialog */
if (histogram_tool_dialog)
histogram_tool_close_callback (NULL, (gpointer) histogram_tool_dialog);
g_free (hist);
}
void
histogram_tool_initialize (GDisplay *gdisp)
{
PixelRegion PR;
if (drawable_indexed (gimage_active_drawable (gdisp->gimage)))
{
g_message (_("Histogram does not operate on indexed drawables."));
return;
}
/* The histogram_tool dialog */
if (!histogram_tool_dialog)
histogram_tool_dialog = histogram_tool_dialog_new ();
else if (!GTK_WIDGET_VISIBLE (histogram_tool_dialog->shell))
gtk_widget_show (histogram_tool_dialog->shell);
histogram_tool_dialog->drawable = gimage_active_drawable (gdisp->gimage);
histogram_tool_dialog->color = drawable_color (histogram_tool_dialog->drawable);
/* hide or show the channel menu based on image type */
if (histogram_tool_dialog->color)
gtk_widget_show (histogram_tool_dialog->channel_menu);
else
gtk_widget_hide (histogram_tool_dialog->channel_menu);
/* calculate the histogram */
pixel_region_init (&PR, drawable_data (histogram_tool_dialog->drawable), 0, 0,
drawable_width (histogram_tool_dialog->drawable),
drawable_height (histogram_tool_dialog->drawable),
FALSE);
gimp_histogram_calculate (histogram_tool_dialog->hist, &PR, NULL);
histogram_widget_update (histogram_tool_dialog->histogram,
histogram_tool_dialog->hist);
histogram_widget_range (histogram_tool_dialog->histogram, 0, 255);
}
/***************************/
/* Histogram Tool dialog */
/***************************/
static HistogramToolDialog *
histogram_tool_dialog_new (void)
{
HistogramToolDialog *htd;
GtkWidget *main_vbox;
GtkWidget *hbox;
GtkWidget *vbox;
GtkWidget *grad_hbox;
GtkWidget *frame;
GtkWidget *table;
GtkWidget *label;
GtkWidget *option_menu;
GtkWidget *menu;
gint i;
gint x, y;
static gchar * histogram_info_names[] =
{
N_("Mean:"),
N_("Std Dev:"),
N_("Median:"),
N_("Pixels:"),
N_("Intensity:"),
N_("Count:"),
N_("Percentile:")
};
static MenuItem color_option_items[] =
{
{ N_("Value"), 0, 0, histogram_tool_value_callback, NULL, NULL, NULL },
{ N_("Red"), 0, 0, histogram_tool_red_callback, NULL, NULL, NULL },
{ N_("Green"), 0, 0, histogram_tool_green_callback, NULL, NULL, NULL },
{ N_("Blue"), 0, 0, histogram_tool_blue_callback, NULL, NULL, NULL },
{ NULL, 0, 0, NULL, NULL, NULL, NULL }
};
htd = g_new (HistogramToolDialog, 1);
htd->channel = HISTOGRAM_VALUE;
for (i = 0; i < 4; i++)
color_option_items [i].user_data = (gpointer) htd;
htd->hist = gimp_histogram_new ();
/* The shell and main vbox */
htd->shell = gimp_dialog_new (_("Histogram"), "histogram",
tools_help_func, NULL,
GTK_WIN_POS_NONE,
FALSE, TRUE, FALSE,
_("Close"), histogram_tool_close_callback,
htd, NULL, NULL, TRUE, TRUE,
NULL);
main_vbox = gtk_vbox_new (FALSE, 4);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 4);
gtk_container_add (GTK_CONTAINER (GTK_DIALOG (htd->shell)->vbox), main_vbox);
hbox = gtk_hbox_new (TRUE, 0);
gtk_box_pack_start (GTK_BOX (main_vbox), hbox, FALSE, FALSE, 0);
vbox = gtk_vbox_new (FALSE, 4);
gtk_box_pack_start (GTK_BOX (hbox), vbox, FALSE, FALSE, 0);
/* The option menu for selecting channels */
htd->channel_menu = gtk_hbox_new (FALSE, 6);
gtk_box_pack_start (GTK_BOX (vbox), htd->channel_menu, FALSE, FALSE, 0);
label = gtk_label_new (_("Information on Channel:"));
gtk_box_pack_start (GTK_BOX (htd->channel_menu), label, FALSE, FALSE, 0);
menu = build_menu (color_option_items, NULL);
option_menu = gtk_option_menu_new ();
gtk_box_pack_start (GTK_BOX (htd->channel_menu), option_menu, FALSE, FALSE, 0);
gtk_widget_show (label);
gtk_widget_show (option_menu);
gtk_widget_show (htd->channel_menu);
gtk_option_menu_set_menu (GTK_OPTION_MENU (option_menu), menu);
/* The histogram tool histogram */
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
htd->histogram = histogram_widget_new (HISTOGRAM_WIDTH, HISTOGRAM_HEIGHT);
gtk_container_add (GTK_CONTAINER (frame), GTK_WIDGET(htd->histogram));
gtk_signal_connect (GTK_OBJECT (htd->histogram), "rangechanged",
GTK_SIGNAL_FUNC (histogram_tool_histogram_range),
htd);
gtk_widget_show (GTK_WIDGET (htd->histogram));
gtk_widget_show (frame);
/* The gradient below the histogram */
grad_hbox = gtk_hbox_new (TRUE, 0);
gtk_box_pack_start (GTK_BOX (vbox), grad_hbox, FALSE, FALSE, 0);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_box_pack_start (GTK_BOX (grad_hbox), frame, FALSE, FALSE, 0);
htd->gradient = gtk_preview_new (GTK_PREVIEW_COLOR);
gtk_preview_size (GTK_PREVIEW (htd->gradient),
HISTOGRAM_WIDTH, GRADIENT_HEIGHT);
gtk_container_add (GTK_CONTAINER (frame), GTK_WIDGET(htd->gradient));
gtk_widget_show (htd->gradient);
gtk_widget_show (frame);
gtk_widget_show (grad_hbox);
histogram_tool_gradient_draw (htd->gradient, HISTOGRAM_VALUE);
gtk_widget_show (vbox);
gtk_widget_show (hbox);
/* The table containing histogram information */
table = gtk_table_new (4, 4, TRUE);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_box_pack_start (GTK_BOX (main_vbox), table, FALSE, FALSE, 0);
/* the labels for histogram information */
for (i = 0; i < 7; i++)
{
y = (i % 4);
x = (i / 4) * 2;
label = gtk_label_new (gettext(histogram_info_names[i]));
gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
gtk_table_attach (GTK_TABLE (table), label, x, x + 1, y, y + 1,
GTK_FILL, GTK_FILL, 2, 2);
gtk_widget_show (label);
htd->info_labels[i] = gtk_label_new ("0");
gtk_misc_set_alignment (GTK_MISC (htd->info_labels[i]), 0.0, 0.5);
gtk_table_attach (GTK_TABLE (table), htd->info_labels[i],
x + 1, x + 2, y, y + 1,
GTK_FILL, GTK_FILL, 2, 2);
gtk_widget_show (htd->info_labels[i]);
}
gtk_widget_show (table);
gtk_widget_show (main_vbox);
gtk_widget_show (htd->shell);
return htd;
}
static void
histogram_tool_close_callback (GtkWidget *widget,
gpointer data)
{
HistogramToolDialog *htd;
htd = (HistogramToolDialog *) data;
if (GTK_WIDGET_VISIBLE (htd->shell))
gtk_widget_hide (htd->shell);
active_tool->gdisp_ptr = NULL;
active_tool->drawable = NULL;
}
static void
histogram_tool_value_callback (GtkWidget *widget,
gpointer data)
{
HistogramToolDialog *htd;
htd = (HistogramToolDialog *) data;
if (htd->channel != HISTOGRAM_VALUE)
{
htd->channel = HISTOGRAM_VALUE;
histogram_widget_channel (htd->histogram, htd->channel);
histogram_tool_gradient_draw (htd->gradient, HISTOGRAM_VALUE);
}
}
static void
histogram_tool_red_callback (GtkWidget *widget,
gpointer data)
{
HistogramToolDialog *htd;
htd = (HistogramToolDialog *) data;
if (htd->channel != HISTOGRAM_RED)
{
htd->channel = HISTOGRAM_RED;
histogram_widget_channel (htd->histogram, htd->channel);
histogram_tool_gradient_draw (htd->gradient, HISTOGRAM_RED);
}
}
static void
histogram_tool_green_callback (GtkWidget *widget,
gpointer data)
{
HistogramToolDialog *htd;
htd = (HistogramToolDialog *) data;
if (htd->channel != HISTOGRAM_GREEN)
{
htd->channel = HISTOGRAM_GREEN;
histogram_widget_channel (htd->histogram, htd->channel);
histogram_tool_gradient_draw (htd->gradient, HISTOGRAM_GREEN);
}
}
static void
histogram_tool_blue_callback (GtkWidget *widget,
gpointer data)
{
HistogramToolDialog *htd;
htd = (HistogramToolDialog *) data;
if (htd->channel != HISTOGRAM_BLUE)
{
htd->channel = HISTOGRAM_BLUE;
histogram_widget_channel (htd->histogram, htd->channel);
histogram_tool_gradient_draw (htd->gradient, HISTOGRAM_BLUE);
}
}
static void
histogram_tool_gradient_draw (GtkWidget *gradient,
gint channel)
{
guchar buf[HISTOGRAM_WIDTH * 3];
guchar r, g, b;
gint i;
r = g = b = 0;
switch (channel)
{
case HISTOGRAM_VALUE:
case HISTOGRAM_ALPHA: r = g = b = 1;
break;
case HISTOGRAM_RED: r = 1;
break;
case HISTOGRAM_GREEN: g = 1;
break;
case HISTOGRAM_BLUE: b = 1;
break;
default:
g_warning ("unknown channel type, can't happen\n");
break;
}
for (i = 0; i < HISTOGRAM_WIDTH; i++)
{
buf[3*i+0] = i*r;
buf[3*i+1] = i*g;
buf[3*i+2] = i*b;
}
for (i = 0; i < GRADIENT_HEIGHT; i++)
gtk_preview_draw_row (GTK_PREVIEW (gradient),
buf, 0, i, HISTOGRAM_WIDTH);
gtk_widget_queue_draw (gradient);
}
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