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gimp/app/brightness_contrast.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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "appenv.h"
#include "actionarea.h"
#include "brightness_contrast.h"
#include "drawable.h"
#include "general.h"
#include "gimage_mask.h"
#include "gdisplay.h"
#include "image_map.h"
#include "interface.h"
#define TEXT_WIDTH 45
#define TEXT_HEIGHT 25
#define SLIDER_WIDTH 200
#define SLIDER_HEIGHT 35
#define BRIGHTNESS_SLIDER 0x1
#define CONTRAST_SLIDER 0x2
#define BRIGHTNESS_TEXT 0x4
#define CONTRAST_TEXT 0x8
#define ALL 0xF
typedef struct _BrightnessContrast BrightnessContrast;
struct _BrightnessContrast
{
int x, y; /* coords for last mouse click */
};
typedef struct _BrightnessContrastDialog BrightnessContrastDialog;
struct _BrightnessContrastDialog
{
GtkWidget *shell;
GtkWidget *gimage_name;
GtkWidget *brightness_text;
GtkWidget *contrast_text;
GtkAdjustment *brightness_data;
GtkAdjustment *contrast_data;
GimpDrawable *drawable;
ImageMap image_map;
double brightness;
double contrast;
gint preview;
};
/* brightness contrast action functions */
static void brightness_contrast_button_press (Tool *, GdkEventButton *, gpointer);
static void brightness_contrast_button_release (Tool *, GdkEventButton *, gpointer);
static void brightness_contrast_motion (Tool *, GdkEventMotion *, gpointer);
static void brightness_contrast_cursor_update (Tool *, GdkEventMotion *, gpointer);
static void brightness_contrast_control (Tool *, int, gpointer);
static BrightnessContrastDialog * brightness_contrast_new_dialog (void);
static void brightness_contrast_update (BrightnessContrastDialog *, int);
static void brightness_contrast_preview (BrightnessContrastDialog *);
static void brightness_contrast_ok_callback (GtkWidget *, gpointer);
static void brightness_contrast_cancel_callback (GtkWidget *, gpointer);
static gint brightness_contrast_delete_callback (GtkWidget *, GdkEvent *, gpointer);
static void brightness_contrast_preview_update (GtkWidget *, gpointer);
static void brightness_contrast_brightness_scale_update (GtkAdjustment *, gpointer);
static void brightness_contrast_contrast_scale_update (GtkAdjustment *, gpointer);
static void brightness_contrast_brightness_text_update (GtkWidget *, gpointer);
static void brightness_contrast_contrast_text_update (GtkWidget *, gpointer);
static void *brightness_contrast_options = NULL;
static BrightnessContrastDialog *brightness_contrast_dialog = NULL;
static void brightness_contrast (PixelRegion *, PixelRegion *, void *);
static Argument * brightness_contrast_invoker (Argument *);
/* brightness contrast machinery */
static void
brightness_contrast (PixelRegion *srcPR,
PixelRegion *destPR,
void *user_data)
{
BrightnessContrastDialog *bcd;
unsigned char *src, *s;
unsigned char *dest, *d;
unsigned char brightness[256];
unsigned char contrast[256];
double power;
int has_alpha;
int alpha;
int w, h, b;
int value;
int i;
bcd = (BrightnessContrastDialog *) user_data;
/* Set the transfer arrays (for speed) */
h = srcPR->h;
src = srcPR->data;
dest = destPR->data;
has_alpha = (srcPR->bytes == 2 || srcPR->bytes == 4);
alpha = has_alpha ? srcPR->bytes - 1 : srcPR->bytes;
if (bcd->brightness < 0)
for (i = 0; i < 256; i++)
brightness[i] = (unsigned char) ((i * (255 + bcd->brightness)) / 255);
else
for (i = 0; i < 256; i++)
brightness[i] = (unsigned char) (i + ((255 - i) * bcd->brightness) / 255);
if (bcd->contrast < 0)
for (i = 0; i < 256; i++)
{
value = (i > 127) ? (255 - i) : i;
value = (int) (127.0 * pow ((double) (value ? value : 1) / 127.0,
(double) (127 + bcd->contrast) / 127.0));
value = BOUNDS (value, 0, 255);
contrast[i] = (i > 127) ? (255 - value) : value;
}
else
for (i = 0; i < 256; i++)
{
value = (i > 127) ? (255 - i) : i;
power = (bcd->contrast == 127) ? 127 : 127.0 / (127 - bcd->contrast);
value = (int) (127.0 * pow ((double) value / 127.0, power));
value = BOUNDS (value, 0, 255);
contrast[i] = (i > 127) ? (255 - value) : value;
}
while (h--)
{
w = srcPR->w;
s = src;
d = dest;
while (w--)
{
for (b = 0; b < alpha; b++)
d[b] = contrast[brightness[s[b]]];
if (has_alpha)
d[alpha] = s[alpha];
s += srcPR->bytes;
d += destPR->bytes;
}
src += srcPR->rowstride;
dest += destPR->rowstride;
}
}
/* by_color select action functions */
static void
brightness_contrast_button_press (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
}
static void
brightness_contrast_button_release (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
}
static void
brightness_contrast_motion (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
}
static void
brightness_contrast_cursor_update (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
GDisplay *gdisp;
gdisp = (GDisplay *) gdisp_ptr;
gdisplay_install_tool_cursor (gdisp, GDK_TOP_LEFT_ARROW);
}
static void
brightness_contrast_control (Tool *tool,
int action,
gpointer gdisp_ptr)
{
switch (action)
{
case PAUSE :
break;
case RESUME :
break;
case HALT :
if (brightness_contrast_dialog)
{
image_map_abort (brightness_contrast_dialog->image_map);
brightness_contrast_dialog->image_map = NULL;
brightness_contrast_cancel_callback (NULL, (gpointer) brightness_contrast_dialog);
}
break;
}
}
Tool *
tools_new_brightness_contrast ()
{
Tool * tool;
BrightnessContrast * private;
/* The tool options */
if (!brightness_contrast_options)
brightness_contrast_options = tools_register_no_options (BRIGHTNESS_CONTRAST,
"Brightness-Contrast Options");
tool = (Tool *) g_malloc (sizeof (Tool));
private = (BrightnessContrast *) g_malloc (sizeof (BrightnessContrast));
tool->type = BRIGHTNESS_CONTRAST;
tool->state = INACTIVE;
tool->scroll_lock = 1; /* Disallow scrolling */
tool->auto_snap_to = TRUE;
tool->private = (void *) private;
tool->button_press_func = brightness_contrast_button_press;
tool->button_release_func = brightness_contrast_button_release;
tool->motion_func = brightness_contrast_motion;
tool->arrow_keys_func = standard_arrow_keys_func;
tool->cursor_update_func = brightness_contrast_cursor_update;
tool->control_func = brightness_contrast_control;
return tool;
}
void
tools_free_brightness_contrast (Tool *tool)
{
BrightnessContrast * bc;
bc = (BrightnessContrast *) tool->private;
/* Close the color select dialog */
if (brightness_contrast_dialog)
brightness_contrast_ok_callback (NULL, (gpointer) brightness_contrast_dialog);
g_free (bc);
}
void
brightness_contrast_initialize (void *gdisp_ptr)
{
GDisplay *gdisp;
gdisp = (GDisplay *) gdisp_ptr;
if (drawable_indexed (gimage_active_drawable (gdisp->gimage)))
{
message_box ("Brightness-Contrast does not operate on indexed drawables.", NULL, NULL);
return;
}
/* The brightness-contrast dialog */
if (!brightness_contrast_dialog)
brightness_contrast_dialog = brightness_contrast_new_dialog ();
else
if (!GTK_WIDGET_VISIBLE (brightness_contrast_dialog->shell))
gtk_widget_show (brightness_contrast_dialog->shell);
/* Initialize dialog fields */
brightness_contrast_dialog->image_map = NULL;
brightness_contrast_dialog->brightness = 0.0;
brightness_contrast_dialog->contrast = 0.0;
brightness_contrast_dialog->drawable = gimage_active_drawable (gdisp->gimage);
brightness_contrast_dialog->image_map = image_map_create (gdisp_ptr,
brightness_contrast_dialog->drawable);
brightness_contrast_update (brightness_contrast_dialog, ALL);
}
/********************************/
/* Brightness Contrast dialog */
/********************************/
/* the action area structure */
static ActionAreaItem action_items[] =
{
{ "OK", brightness_contrast_ok_callback, NULL, NULL },
{ "Cancel", brightness_contrast_cancel_callback, NULL, NULL }
};
static BrightnessContrastDialog *
brightness_contrast_new_dialog ()
{
BrightnessContrastDialog *bcd;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *table;
GtkWidget *label;
GtkWidget *slider;
GtkWidget *toggle;
GtkObject *data;
bcd = g_malloc (sizeof (BrightnessContrastDialog));
bcd->preview = TRUE;
/* The shell and main vbox */
bcd->shell = gtk_dialog_new ();
gtk_window_set_wmclass (GTK_WINDOW (bcd->shell), "brightness_contrast", "Gimp");
gtk_window_set_title (GTK_WINDOW (bcd->shell), "Brightness-Contrast");
/* handle wm close signal */
gtk_signal_connect (GTK_OBJECT (bcd->shell), "delete_event",
GTK_SIGNAL_FUNC (brightness_contrast_delete_callback),
bcd);
vbox = gtk_vbox_new (FALSE, 2);
gtk_container_border_width (GTK_CONTAINER (vbox), 2);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (bcd->shell)->vbox), vbox, TRUE, TRUE, 0);
/* The table containing sliders */
table = gtk_table_new (2, 3, FALSE);
gtk_box_pack_start (GTK_BOX (vbox), table, FALSE, FALSE, 0);
/* Create the brightness scale widget */
label = gtk_label_new ("Brightness");
gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
gtk_table_attach (GTK_TABLE (table), label, 0, 1, 0, 1,
GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 2, 2);
data = gtk_adjustment_new (0, -127, 127.0, 1.0, 1.0, 0.0);
bcd->brightness_data = GTK_ADJUSTMENT (data);
slider = gtk_hscale_new (GTK_ADJUSTMENT (data));
gtk_widget_set_usize (slider, SLIDER_WIDTH, SLIDER_HEIGHT);
gtk_scale_set_digits (GTK_SCALE (slider), 0);
gtk_scale_set_value_pos (GTK_SCALE (slider), GTK_POS_TOP);
gtk_range_set_update_policy (GTK_RANGE (slider), GTK_UPDATE_DELAYED);
gtk_table_attach (GTK_TABLE (table), slider, 1, 2, 0, 1,
GTK_EXPAND | GTK_SHRINK | GTK_FILL,
GTK_EXPAND | GTK_SHRINK | GTK_FILL,
2, 2);
gtk_signal_connect (GTK_OBJECT (data), "value_changed",
(GtkSignalFunc) brightness_contrast_brightness_scale_update,
bcd);
bcd->brightness_text = gtk_entry_new ();
gtk_widget_set_usize (bcd->brightness_text, TEXT_WIDTH, TEXT_HEIGHT);
gtk_table_attach (GTK_TABLE (table), bcd->brightness_text, 2, 3, 0, 1,
GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 2, 2);
gtk_signal_connect (GTK_OBJECT (bcd->brightness_text), "changed",
(GtkSignalFunc) brightness_contrast_brightness_text_update,
bcd);
gtk_widget_show (label);
gtk_widget_show (bcd->brightness_text);
gtk_widget_show (slider);
/* Create the contrast scale widget */
label = gtk_label_new ("Contrast");
gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
gtk_table_attach (GTK_TABLE (table), label, 0, 1, 1, 2,
GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 2, 2);
data = gtk_adjustment_new (0, -127.0, 127.0, 1.0, 1.0, 0.0);
bcd->contrast_data = GTK_ADJUSTMENT (data);
slider = gtk_hscale_new (GTK_ADJUSTMENT (data));
gtk_widget_set_usize (slider, SLIDER_WIDTH, SLIDER_HEIGHT);
gtk_scale_set_digits (GTK_SCALE (slider), 0);
gtk_scale_set_value_pos (GTK_SCALE (slider), GTK_POS_TOP);
gtk_range_set_update_policy (GTK_RANGE (slider), GTK_UPDATE_DELAYED);
gtk_table_attach (GTK_TABLE (table), slider, 1, 2, 1, 2,
GTK_EXPAND | GTK_SHRINK | GTK_FILL,
GTK_EXPAND | GTK_SHRINK | GTK_FILL,
2, 2);
gtk_signal_connect (GTK_OBJECT (data), "value_changed",
(GtkSignalFunc) brightness_contrast_contrast_scale_update,
bcd);
bcd->contrast_text = gtk_entry_new ();
gtk_widget_set_usize (bcd->contrast_text, TEXT_WIDTH, TEXT_HEIGHT);
gtk_table_attach (GTK_TABLE (table), bcd->contrast_text, 2, 3, 1, 2,
GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 2, 2);
gtk_signal_connect (GTK_OBJECT (bcd->contrast_text), "changed",
(GtkSignalFunc) brightness_contrast_contrast_text_update,
bcd);
gtk_widget_show (label);
gtk_widget_show (bcd->contrast_text);
gtk_widget_show (slider);
/* Horizontal box for preview and preserve luminosity toggle buttons */
hbox = gtk_hbox_new (TRUE, 2);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
/* The preview toggle */
toggle = gtk_check_button_new_with_label ("Preview");
gtk_toggle_button_set_state (GTK_TOGGLE_BUTTON (toggle), bcd->preview);
gtk_box_pack_start (GTK_BOX (hbox), toggle, TRUE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
(GtkSignalFunc) brightness_contrast_preview_update,
bcd);
gtk_widget_show (label);
gtk_widget_show (toggle);
gtk_widget_show (hbox);
/* The action area */
action_items[0].user_data = bcd;
action_items[1].user_data = bcd;
build_action_area (GTK_DIALOG (bcd->shell), action_items, 2, 0);
gtk_widget_show (table);
gtk_widget_show (vbox);
gtk_widget_show (bcd->shell);
return bcd;
}
static void
brightness_contrast_update (BrightnessContrastDialog *bcd,
int update)
{
char text[12];
if (update & BRIGHTNESS_SLIDER)
{
bcd->brightness_data->value = bcd->brightness;
gtk_signal_emit_by_name (GTK_OBJECT (bcd->brightness_data), "value_changed");
}
if (update & CONTRAST_SLIDER)
{
bcd->contrast_data->value = bcd->contrast;
gtk_signal_emit_by_name (GTK_OBJECT (bcd->contrast_data), "value_changed");
}
if (update & BRIGHTNESS_TEXT)
{
sprintf (text, "%0.0f", bcd->brightness);
gtk_entry_set_text (GTK_ENTRY (bcd->brightness_text), text);
}
if (update & CONTRAST_TEXT)
{
sprintf (text, "%0.0f", bcd->contrast);
gtk_entry_set_text (GTK_ENTRY (bcd->contrast_text), text);
}
}
static void
brightness_contrast_preview (BrightnessContrastDialog *bcd)
{
if (!bcd->image_map)
g_warning ("No image map");
image_map_apply (bcd->image_map, brightness_contrast, (void *) bcd);
}
static void
brightness_contrast_ok_callback (GtkWidget *widget,
gpointer client_data)
{
BrightnessContrastDialog *bcd;
bcd = (BrightnessContrastDialog *) client_data;
if (GTK_WIDGET_VISIBLE (bcd->shell))
gtk_widget_hide (bcd->shell);
if (!bcd->preview)
image_map_apply (bcd->image_map, brightness_contrast, (void *) bcd);
if (bcd->image_map)
image_map_commit (bcd->image_map);
bcd->image_map = NULL;
}
static gint
brightness_contrast_delete_callback (GtkWidget *w,
GdkEvent *e,
gpointer d)
{
brightness_contrast_cancel_callback (w, d);
return TRUE;
}
static void
brightness_contrast_cancel_callback (GtkWidget *widget,
gpointer client_data)
{
BrightnessContrastDialog *bcd;
bcd = (BrightnessContrastDialog *) client_data;
if (GTK_WIDGET_VISIBLE (bcd->shell))
gtk_widget_hide (bcd->shell);
if (bcd->image_map)
{
image_map_abort (bcd->image_map);
gdisplays_flush ();
}
bcd->image_map = NULL;
}
static void
brightness_contrast_preview_update (GtkWidget *w,
gpointer data)
{
BrightnessContrastDialog *bcd;
bcd = (BrightnessContrastDialog *) data;
if (GTK_TOGGLE_BUTTON (w)->active)
{
bcd->preview = TRUE;
brightness_contrast_preview (bcd);
}
else
bcd->preview = FALSE;
}
static void
brightness_contrast_brightness_scale_update (GtkAdjustment *adjustment,
gpointer data)
{
BrightnessContrastDialog *bcd;
bcd = (BrightnessContrastDialog *) data;
if (bcd->brightness != adjustment->value)
{
bcd->brightness = adjustment->value;
brightness_contrast_update (bcd, BRIGHTNESS_TEXT);
if (bcd->preview)
brightness_contrast_preview (bcd);
}
}
static void
brightness_contrast_contrast_scale_update (GtkAdjustment *adjustment,
gpointer data)
{
BrightnessContrastDialog *bcd;
bcd = (BrightnessContrastDialog *) data;
if (bcd->contrast != adjustment->value)
{
bcd->contrast = adjustment->value;
brightness_contrast_update (bcd, CONTRAST_TEXT);
if (bcd->preview)
brightness_contrast_preview (bcd);
}
}
static void
brightness_contrast_brightness_text_update (GtkWidget *w,
gpointer data)
{
BrightnessContrastDialog *bcd;
char *str;
int value;
str = gtk_entry_get_text (GTK_ENTRY (w));
bcd = (BrightnessContrastDialog *) data;
value = BOUNDS (((int) atof (str)), -127, 127);
if ((int) bcd->brightness != value)
{
bcd->brightness = value;
brightness_contrast_update (bcd, BRIGHTNESS_SLIDER);
if (bcd->preview)
brightness_contrast_preview (bcd);
}
}
static void
brightness_contrast_contrast_text_update (GtkWidget *w,
gpointer data)
{
BrightnessContrastDialog *bcd;
char *str;
int value;
str = gtk_entry_get_text (GTK_ENTRY (w));
bcd = (BrightnessContrastDialog *) data;
value = BOUNDS (((int) atof (str)), -127, 127);
if ((int) bcd->contrast != value)
{
bcd->contrast = value;
brightness_contrast_update (bcd, CONTRAST_SLIDER);
if (bcd->preview)
brightness_contrast_preview (bcd);
}
}
/* The brightness_contrast procedure definition */
ProcArg brightness_contrast_args[] =
{
{ PDB_IMAGE,
"image",
"the image"
},
{ PDB_DRAWABLE,
"drawable",
"the drawable"
},
{ PDB_INT32,
"brightness",
"brightness adjustment: (-127 <= brightness <= 127)"
},
{ PDB_INT32,
"contrast",
"constrast adjustment: (-127 <= contrast <= 127)"
}
};
ProcRecord brightness_contrast_proc =
{
"gimp_brightness_contrast",
"Modify brightness/contrast in the specified drawable",
"This procedures allows the brightness and contrast of the specified drawable to be modified. Both 'brightness' and 'contrast' parameters are defined between -127 and 127.",
"Spencer Kimball & Peter Mattis",
"Spencer Kimball & Peter Mattis",
"1997",
PDB_INTERNAL,
/* Input arguments */
4,
brightness_contrast_args,
/* Output arguments */
0,
NULL,
/* Exec method */
{ { brightness_contrast_invoker } },
};
static Argument *
brightness_contrast_invoker (Argument *args)
{
PixelRegion srcPR, destPR;
int success = TRUE;
int int_value;
BrightnessContrastDialog bcd;
GImage *gimage;
int brightness;
int contrast;
int x1, y1, x2, y2;
void *pr;
GimpDrawable *drawable;
drawable = NULL;
brightness = 0;
contrast = 0;
/* the gimage */
if (success)
{
int_value = args[0].value.pdb_int;
if (! (gimage = gimage_get_ID (int_value)))
success = FALSE;
}
/* the drawable */
if (success)
{
int_value = args[1].value.pdb_int;
drawable = drawable_get_ID (int_value);
if (drawable == NULL || gimage != drawable_gimage (drawable))
success = FALSE;
}
/* make sure the drawable is not indexed color */
if (success)
success = ! drawable_indexed (drawable);
/* brightness */
if (success)
{
int_value = args[2].value.pdb_int;
if (int_value < -127 || int_value > 127)
success = FALSE;
else
brightness = int_value;
}
/* contrast */
if (success)
{
int_value = args[3].value.pdb_int;
if (int_value < -127 || int_value > 127)
success = FALSE;
else
contrast = int_value;
}
/* arrange to modify the brightness/contrast */
if (success)
{
bcd.brightness = brightness;
bcd.contrast = contrast;
/* The application should occur only within selection bounds */
drawable_mask_bounds (drawable, &x1, &y1, &x2, &y2);
pixel_region_init (&srcPR, drawable_data (drawable), x1, y1, (x2 - x1), (y2 - y1), FALSE);
pixel_region_init (&destPR, drawable_shadow (drawable), x1, y1, (x2 - x1), (y2 - y1), TRUE);
for (pr = pixel_regions_register (2, &srcPR, &destPR); pr != NULL; pr = pixel_regions_process (pr))
brightness_contrast (&srcPR, &destPR, (void *) &bcd);
drawable_merge_shadow (drawable, TRUE);
drawable_update (drawable, x1, y1, (x2 - x1), (y2 - y1));
}
return procedural_db_return_args (&brightness_contrast_proc, success);
}
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