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gimp/plug-ins/common/exchange.c

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/*
* This is a plug-in for the GIMP.
*
* 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.
*
*
*/
/*
* Exchange one color with the other (settable threshold to convert from
* one color-shade to another...might do wonders on certain images, or be
* totally useless on others).
*
* Author: robert@experimental.net
*
* Added ability to select "from" color by clicking on the preview image.
* As a side effect, clicking twice on the same spot reverses the action,
* i.e. you can click once, see the result, and click again to revert.
*
* Also changed update policies for all sliders to delayed. On a slow machine
* the algorithm really chewes up CPU time.
*
* - timecop@japan.co.jp
*/
#include "config.h"
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_PROC "plug-in-exchange"
#define PLUG_IN_BINARY "exchange"
#define SCALE_WIDTH 128
#define PREVIEW_SIZE 128
/* datastructure to store parameters in */
typedef struct
{
GimpRGB from;
GimpRGB to;
GimpRGB threshold;
gboolean preview;
} myParams;
/* lets prototype */
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void exchange (GimpDrawable *drawable,
GimpPreview *preview);
static gboolean exchange_dialog (GimpDrawable *preview);
static void color_button_callback (GtkWidget *widget,
gpointer data);
static void scale_callback (GtkAdjustment *adj,
gpointer data);
/* some global variables */
static myParams xargs =
{
{ 0.0, 0.0, 0.0, 1.0 }, /* from */
{ 0.0, 0.0, 0.0, 1.0 }, /* to */
{ 0.0, 0.0, 0.0, 1.0 }, /* threshold */
TRUE /* preview */
};
static GtkWidget *from_colorbutton;
static gboolean lock_threshold = FALSE;
/* lets declare what we want to do */
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
/* run program */
MAIN ()
/* tell GIMP who we are */
static void
query (void)
{
static GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "run-mode", "Interactive" },
{ GIMP_PDB_IMAGE, "image", "Input image" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
{ GIMP_PDB_INT8, "from-red", "Red value (from)" },
{ GIMP_PDB_INT8, "from-green", "Green value (from)" },
{ GIMP_PDB_INT8, "from-blue", "Blue value (from)" },
{ GIMP_PDB_INT8, "to-red", "Red value (to)" },
{ GIMP_PDB_INT8, "to-green", "Green value (to)" },
{ GIMP_PDB_INT8, "to-blue", "Blue value (to)" },
{ GIMP_PDB_INT8, "red-threshold", "Red threshold" },
{ GIMP_PDB_INT8, "green-threshold", "Green threshold" },
{ GIMP_PDB_INT8, "blue-threshold", "Blue threshold" }
};
gimp_install_procedure (PLUG_IN_PROC,
"Color Exchange",
"Exchange one color with another, optionally setting a threshold "
"to convert from one shade to another",
"robert@experimental.net",
"robert@experimental.net",
"June 17th, 1997",
N_("_Color Exchange..."),
"RGB*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Filters/Colors/Map");
}
/* main function */
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpRunMode runmode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
GimpDrawable *drawable;
*nreturn_vals = 1;
*return_vals = values;
INIT_I18N ();
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
runmode = param[0].data.d_int32;
drawable = gimp_drawable_get (param[2].data.d_drawable);
switch (runmode)
{
case GIMP_RUN_INTERACTIVE:
/* retrieve stored arguments (if any) */
gimp_get_data (PLUG_IN_PROC, &xargs);
/* initialize using foreground color */
gimp_context_get_foreground (&xargs.from);
if (! exchange_dialog (drawable))
return;
break;
case GIMP_RUN_WITH_LAST_VALS:
gimp_get_data (PLUG_IN_PROC, &xargs);
/*
* instead of recalling the last-set values,
* run with the current foreground as 'from'
* color, making ALT-F somewhat more useful.
*/
gimp_context_get_foreground (&xargs.from);
break;
case GIMP_RUN_NONINTERACTIVE:
if (nparams != 12)
{
status = GIMP_PDB_EXECUTION_ERROR;
}
else
{
gimp_rgb_set_uchar (&xargs.from,
param[3].data.d_int8,
param[4].data.d_int8,
param[5].data.d_int8);
gimp_rgb_set_uchar (&xargs.to,
param[6].data.d_int8,
param[7].data.d_int8,
param[8].data.d_int8);
gimp_rgb_set_uchar (&xargs.threshold,
param[9].data.d_int8,
param[10].data.d_int8,
param[11].data.d_int8);
}
break;
default:
break;
}
if (status == GIMP_PDB_SUCCESS)
{
if (gimp_drawable_is_rgb (drawable->drawable_id))
{
gimp_progress_init (_("Color Exchange..."));
gimp_tile_cache_ntiles (2 * (drawable->width /
gimp_tile_width () + 1));
exchange (drawable, NULL);
gimp_drawable_detach (drawable);
/* store our settings */
if (runmode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PLUG_IN_PROC, &xargs, sizeof (myParams));
/* and flush */
if (runmode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
}
else
status = GIMP_PDB_EXECUTION_ERROR;
}
values[0].data.d_status = status;
}
static gboolean
preview_event_handler (GtkWidget *area,
GdkEvent *event,
GtkWidget *preview)
{
gint pos;
guchar *buf;
guint32 drawable_id;
GimpRGB color;
GdkEventButton *button_event = (GdkEventButton *)event;
buf = GIMP_PREVIEW_AREA (area)->buf;
drawable_id = GIMP_DRAWABLE_PREVIEW (preview)->drawable->drawable_id;
switch (event->type)
{
case GDK_BUTTON_PRESS:
if (button_event->button == 2)
{
pos = event->button.x * gimp_drawable_bpp (drawable_id) +
event->button.y * GIMP_PREVIEW_AREA (area)->rowstride;
gimp_rgb_set_uchar (&color, buf[pos], buf[pos + 1], buf[pos + 2]);
gimp_color_button_set_color (GIMP_COLOR_BUTTON (from_colorbutton),
&color);
}
break;
default:
break;
}
return FALSE;
}
/* show our dialog */
static gboolean
exchange_dialog (GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *frame;
GtkWidget *preview;
GtkWidget *table;
GtkWidget *threshold;
GtkWidget *colorbutton;
GtkWidget *scale;
GtkSizeGroup *group;
GtkObject *adj;
gint framenumber;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, TRUE);
dialog = gimp_dialog_new (_("Color Exchange"), PLUG_IN_BINARY,
NULL, 0,
gimp_standard_help_func, PLUG_IN_PROC,
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
gtk_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
/* do some boxes here */
main_vbox = gtk_vbox_new (FALSE, 12);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);
gtk_container_add (GTK_CONTAINER (GTK_DIALOG (dialog)->vbox), main_vbox);
gtk_widget_show (main_vbox);
frame = gimp_frame_new (_("Middle-click inside preview to pick \"From Color\""));
gtk_box_pack_start_defaults (GTK_BOX (main_vbox), frame);
gtk_widget_show (frame);
preview = gimp_drawable_preview_new (drawable, &xargs.preview);
gtk_container_add (GTK_CONTAINER (frame), preview);
gtk_widget_show (preview);
g_signal_connect_swapped (preview, "invalidated",
G_CALLBACK (exchange),
drawable);
g_signal_connect (GIMP_PREVIEW (preview)->area, "event",
G_CALLBACK (preview_event_handler),
preview);
/* a hidden color_button to handle the threshold more easily */
threshold = gimp_color_button_new (NULL, 1, 1,
&xargs.threshold,
GIMP_COLOR_AREA_FLAT);
g_signal_connect (threshold, "color-changed",
G_CALLBACK (gimp_color_button_get_color),
&xargs.threshold);
g_signal_connect (threshold, "color-changed",
G_CALLBACK (color_button_callback),
&xargs.threshold);
g_signal_connect_swapped (threshold, "color-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
/* and our scales */
group = gtk_size_group_new (GTK_SIZE_GROUP_HORIZONTAL);
for (framenumber = 0; framenumber < 2; framenumber++)
{
GtkWidget *image;
gint row = 0;
frame = gimp_frame_new (framenumber ? _("To Color") : _("From Color"));
gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
table = gtk_table_new (framenumber ? 4 : 8, 4, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_table_set_row_spacings (GTK_TABLE (table), 2);
gtk_table_set_row_spacing (GTK_TABLE (table), 0, 12);
if (!framenumber)
{
gtk_table_set_row_spacing (GTK_TABLE (table), 2, 6);
gtk_table_set_row_spacing (GTK_TABLE (table), 4, 6);
gtk_table_set_row_spacing (GTK_TABLE (table), 6, 6);
}
gtk_container_add (GTK_CONTAINER (frame), table);
gtk_widget_show (table);
colorbutton = gimp_color_button_new (framenumber ?
_("Color Exchange: To Color") :
_("Color Exchange: From Color"),
SCALE_WIDTH / 2, 16,
(framenumber ?
&xargs.to : &xargs.from),
GIMP_COLOR_AREA_FLAT);
gimp_table_attach_aligned (GTK_TABLE (table), 0, row++,
NULL, 0.0, 0.0,
colorbutton, 1, FALSE);
g_signal_connect (colorbutton, "color-changed",
G_CALLBACK (gimp_color_button_get_color),
framenumber ? &xargs.to : &xargs.from);
g_signal_connect (colorbutton, "color-changed",
G_CALLBACK (color_button_callback),
framenumber ? &xargs.to : &xargs.from);
g_signal_connect_swapped (colorbutton, "color-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
if (!framenumber)
from_colorbutton = colorbutton;
/* Red */
image = gtk_image_new_from_stock (GIMP_STOCK_CHANNEL_RED,
GTK_ICON_SIZE_BUTTON);
gtk_misc_set_alignment (GTK_MISC (image), 0.5, 0.5);
gtk_table_attach (GTK_TABLE (table), image,
0, 1, row, row + 1 + (framenumber ? 0 : 1),
GTK_FILL, GTK_FILL, 0, 0);
gtk_widget_show (image);
adj = gimp_scale_entry_new (GTK_TABLE (table), 1, row++,
_("_Red:"), SCALE_WIDTH, 0,
framenumber ? xargs.to.r : xargs.from.r,
0.0, 1.0, 0.01, 0.1, 3,
TRUE, 0, 0,
NULL, NULL);
g_object_set_data (G_OBJECT (adj), "colorbutton", colorbutton);
g_object_set_data (G_OBJECT (colorbutton), "red", adj);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
framenumber ? &xargs.to.r : &xargs.from.r);
g_signal_connect (adj, "value-changed",
G_CALLBACK (scale_callback),
framenumber ? &xargs.to : &xargs.from);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
scale = GTK_WIDGET (GIMP_SCALE_ENTRY_SCALE (adj));
gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
gtk_size_group_add_widget (group, GIMP_SCALE_ENTRY_LABEL (adj));
if (! framenumber)
{
adj = gimp_scale_entry_new (GTK_TABLE (table), 1, row++,
_("R_ed threshold:"), SCALE_WIDTH, 0,
xargs.threshold.r,
0.0, 1.0, 0.01, 0.1, 3,
TRUE, 0, 0,
NULL, NULL);
g_object_set_data (G_OBJECT (adj), "colorbutton", threshold);
g_object_set_data (G_OBJECT (threshold), "red", adj);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&xargs.threshold.r);
g_signal_connect (adj, "value-changed",
G_CALLBACK (scale_callback),
&xargs.threshold);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
scale = GTK_WIDGET (GIMP_SCALE_ENTRY_SCALE (adj));
gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
gtk_size_group_add_widget (group, GIMP_SCALE_ENTRY_LABEL (adj));
}
/* Green */
image = gtk_image_new_from_stock (GIMP_STOCK_CHANNEL_GREEN,
GTK_ICON_SIZE_BUTTON);
gtk_misc_set_alignment (GTK_MISC (image), 0.5, 0.5);
gtk_table_attach (GTK_TABLE (table), image,
0, 1, row, row + 1 + (framenumber ? 0 : 1),
GTK_FILL, GTK_FILL, 0, 0);
gtk_widget_show (image);
adj = gimp_scale_entry_new (GTK_TABLE (table), 1, row++,
_("_Green:"), SCALE_WIDTH, 0,
framenumber ? xargs.to.g : xargs.from.g,
0.0, 1.0, 0.01, 0.1, 3,
TRUE, 0, 0,
NULL, NULL);
g_object_set_data (G_OBJECT (adj), "colorbutton", colorbutton);
g_object_set_data (G_OBJECT (colorbutton), "green", adj);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
framenumber ? &xargs.to.g : &xargs.from.g);
g_signal_connect (adj, "value-changed",
G_CALLBACK (scale_callback),
framenumber ? &xargs.to : &xargs.from);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
scale = GTK_WIDGET (GIMP_SCALE_ENTRY_SCALE (adj));
gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
gtk_size_group_add_widget (group, GIMP_SCALE_ENTRY_LABEL (adj));
if (!framenumber)
{
adj = gimp_scale_entry_new (GTK_TABLE (table), 1, row++,
_("G_reen threshold:"), SCALE_WIDTH, 0,
xargs.threshold.g,
0.0, 1.0, 0.01, 0.1, 3,
TRUE, 0, 0,
NULL, NULL);
g_object_set_data (G_OBJECT (adj), "colorbutton", threshold);
g_object_set_data (G_OBJECT (threshold), "green", adj);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&xargs.threshold.g);
g_signal_connect (adj, "value-changed",
G_CALLBACK (scale_callback),
&xargs.threshold);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
scale = GTK_WIDGET (GIMP_SCALE_ENTRY_SCALE (adj));
gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
gtk_size_group_add_widget (group, GIMP_SCALE_ENTRY_LABEL (adj));
}
/* Blue */
image = gtk_image_new_from_stock (GIMP_STOCK_CHANNEL_BLUE,
GTK_ICON_SIZE_BUTTON);
gtk_misc_set_alignment (GTK_MISC (image), 0.5, 0.5);
gtk_table_attach (GTK_TABLE (table), image,
0, 1, row, row + 1 + (framenumber ? 0 : 1),
GTK_FILL, GTK_FILL, 0, 0);
gtk_widget_show (image);
adj = gimp_scale_entry_new (GTK_TABLE (table), 1, row++,
_("_Blue:"), SCALE_WIDTH, 0,
framenumber ? xargs.to.b : xargs.from.b,
0.0, 1.0, 0.01, 0.1, 3,
TRUE, 0, 0,
NULL, NULL);
g_object_set_data (G_OBJECT (adj), "colorbutton", colorbutton);
g_object_set_data (G_OBJECT (colorbutton), "blue", adj);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
framenumber ? &xargs.to.b : &xargs.from.b);
g_signal_connect (adj, "value-changed",
G_CALLBACK (scale_callback),
framenumber ? &xargs.to : &xargs.from);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
scale = GTK_WIDGET (GIMP_SCALE_ENTRY_SCALE (adj));
gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
gtk_size_group_add_widget (group, GIMP_SCALE_ENTRY_LABEL (adj));
if (! framenumber)
{
adj = gimp_scale_entry_new (GTK_TABLE (table), 1, row++,
_("B_lue threshold:"), SCALE_WIDTH, 0,
xargs.threshold.b,
0.0, 1.0, 0.01, 0.1, 3,
TRUE, 0, 0,
NULL, NULL);
g_object_set_data (G_OBJECT (adj), "colorbutton", threshold);
g_object_set_data (G_OBJECT (threshold), "blue", adj);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&xargs.threshold.b);
g_signal_connect (adj, "value-changed",
G_CALLBACK (scale_callback),
&xargs.threshold);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
scale = GTK_WIDGET (GIMP_SCALE_ENTRY_SCALE (adj));
gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
gtk_size_group_add_widget (group, GIMP_SCALE_ENTRY_LABEL (adj));
}
if (!framenumber)
{
GtkWidget *button;
button = gtk_check_button_new_with_mnemonic (_("Lock _thresholds"));
gtk_table_attach (GTK_TABLE (table), button, 2, 4, row, row + 1,
GTK_FILL, 0, 0, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button),
lock_threshold);
gtk_widget_show (button);
g_signal_connect (button, "clicked",
G_CALLBACK (gimp_toggle_button_update),
&lock_threshold);
g_signal_connect_swapped (button, "clicked",
G_CALLBACK (gimp_preview_invalidate),
preview);
}
}
g_object_unref (group);
/* show everything */
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
static void
color_button_callback (GtkWidget *widget,
gpointer data)
{
GtkObject *red_adj;
GtkObject *green_adj;
GtkObject *blue_adj;
GimpRGB *color;
color = (GimpRGB *) data;
red_adj = (GtkObject *) g_object_get_data (G_OBJECT (widget), "red");
green_adj = (GtkObject *) g_object_get_data (G_OBJECT (widget), "green");
blue_adj = (GtkObject *) g_object_get_data (G_OBJECT (widget), "blue");
if (red_adj)
gtk_adjustment_set_value (GTK_ADJUSTMENT (red_adj), color->r);
if (green_adj)
gtk_adjustment_set_value (GTK_ADJUSTMENT (green_adj), color->g);
if (blue_adj)
gtk_adjustment_set_value (GTK_ADJUSTMENT (blue_adj), color->b);
}
static void
scale_callback (GtkAdjustment *adj,
gpointer data)
{
GtkObject *object;
GimpRGB *color;
color = (GimpRGB *) data;
object = g_object_get_data (G_OBJECT (adj), "colorbutton");
if (GIMP_IS_COLOR_BUTTON (object))
{
if (color == &xargs.threshold && lock_threshold == TRUE)
gimp_rgb_set (color, adj->value, adj->value, adj->value);
gimp_color_button_set_color (GIMP_COLOR_BUTTON (object), color);
}
}
/* do the exchanging */
static void
exchange (GimpDrawable *drawable,
GimpPreview *preview)
{
GimpPixelRgn srcPR, destPR;
guchar min_red, min_green, min_blue;
guchar max_red, max_green, max_blue;
guchar from_red, from_green, from_blue;
guchar to_red, to_green, to_blue;
guchar *src_row, *dest_row;
gint x, y, bpp = drawable->bpp;
gboolean has_alpha;
gint x1, y1, x2, y2;
gint width, height;
GimpRGB min;
GimpRGB max;
if (preview)
{
gimp_preview_get_position (preview, &x1, &y1);
gimp_preview_get_size (preview, &width, &height);
x2 = x1 + width;
y2 = y1 + height;
}
else
{
gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
width = x2 - x1;
height = y2 - y1;
}
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
/* allocate memory */
src_row = g_new (guchar, drawable->width * bpp);
gimp_rgb_get_uchar (&xargs.from, &from_red, &from_green, &from_blue);
gimp_rgb_get_uchar (&xargs.to, &to_red, &to_green, &to_blue);
/* get boundary values */
min = xargs.from;
gimp_rgb_subtract (&min, &xargs.threshold);
gimp_rgb_clamp (&min);
gimp_rgb_get_uchar (&min, &min_red, &min_green, &min_blue);
max = xargs.from;
gimp_rgb_add (&max, &xargs.threshold);
gimp_rgb_clamp (&max);
gimp_rgb_get_uchar (&max, &max_red, &max_green, &max_blue);
dest_row = g_new (guchar, drawable->width * bpp);
gimp_pixel_rgn_init (&srcPR, drawable,
x1, y1, width, height, FALSE, FALSE);
gimp_pixel_rgn_init (&destPR, drawable,
x1, y1, width, height, (preview == NULL), TRUE);
for (y = y1; y < y2; y++)
{
gimp_pixel_rgn_get_row (&srcPR, src_row, x1, y, width);
for (x = 0; x < width; x++)
{
guchar pixel_red, pixel_green, pixel_blue;
guchar new_red, new_green, new_blue;
guint idx;
/* get current pixel-values */
pixel_red = src_row[x * bpp];
pixel_green = src_row[x * bpp + 1];
pixel_blue = src_row[x * bpp + 2];
idx = x * bpp;
/* want this pixel? */
if (pixel_red >= min_red &&
pixel_red <= max_red &&
pixel_green >= min_green &&
pixel_green <= max_green &&
pixel_blue >= min_blue &&
pixel_blue <= max_blue)
{
guchar red_delta, green_delta, blue_delta;
red_delta = pixel_red > from_red ?
pixel_red - from_red : from_red - pixel_red;
green_delta = pixel_green > from_green ?
pixel_green - from_green : from_green - pixel_green;
blue_delta = pixel_blue > from_blue ?
pixel_blue - from_blue : from_blue - pixel_blue;
new_red = CLAMP (to_red + red_delta, 0, 255);
new_green = CLAMP (to_green + green_delta, 0, 255);
new_blue = CLAMP (to_blue + blue_delta, 0, 255);
}
else
{
new_red = pixel_red;
new_green = pixel_green;
new_blue = pixel_blue;
}
/* fill buffer */
dest_row[idx + 0] = new_red;
dest_row[idx + 1] = new_green;
dest_row[idx + 2] = new_blue;
/* copy alpha-channel */
if (has_alpha)
dest_row[idx + 3] = src_row[x * bpp + 3];
}
/* store the dest */
gimp_pixel_rgn_set_row (&destPR, dest_row, x1, y, width);
/* and tell the user what we're doing */
if (!preview && (y % 10) == 0)
gimp_progress_update ((gdouble) y / (gdouble) height);
}
g_free (src_row);
g_free (dest_row);
if (preview)
{
gimp_drawable_preview_draw_region (GIMP_DRAWABLE_PREVIEW (preview),
&destPR);
}
else
{
/* update the processed region */
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, width, height);
}
}
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