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gimp/plug-ins/common/displace.c

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/* Displace --- image filter plug-in for GIMP
* Copyright (C) 1996 Stephen Robert Norris
* Much of the code taken from the pinch plug-in by 1996 Federico Mena Quintero
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
* You can contact me at srn@flibble.cs.su.oz.au.
* Please send me any patches or enhancements to this code.
* You can contact the original GIMP authors at gimp@xcf.berkeley.edu
*
* Extensive modifications to the dialog box, parameters, and some
* legibility stuff in displace() by Federico Mena Quintero ---
* federico@nuclecu.unam.mx. If there are any bugs in these
* changes, they are my fault and not Stephen's.
*
* JTL: May 29th 1997
* Added (part of) the patch from Eiichi Takamori
* -- the part which removes the border artefacts
* (http://ha1.seikyou.ne.jp/home/taka/gimp/displace/displace.html)
* Added ability to use transparency as the identity transformation
* (Full transparency is treated as if it was grey 0.5)
* and the possibility to use RGB/RGBA pictures where the luminance
* of the pixel is taken into account
*
* Joao S. O. Bueno, Dec. 2004:
*
* Added functionality to displace using polar coordinates -
* For a plain, non neutral map, works like whirl and pinch
*/
/* Version 1.12. */
#include "config.h"
#include <string.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
/* Some useful macros */
#define PLUG_IN_PROC "plug-in-displace"
#define PLUG_IN_BINARY "displace"
#define ENTRY_WIDTH 75
#define TILE_CACHE_SIZE 48
typedef enum
{
CARTESIAN_MODE = 0,
POLAR_MODE = 1
} DisplaceMode;
typedef struct
{
gdouble amount_x;
gdouble amount_y;
gint do_x;
gint do_y;
gint displace_map_x;
gint displace_map_y;
gint displace_type;
DisplaceMode mode;
} DisplaceVals;
/*
* Function prototypes.
*/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void displace (GimpDrawable *drawable,
GimpPreview *preview);
static gboolean displace_dialog (GimpDrawable *drawable);
static void displace_radio_update (GtkWidget *widget,
gpointer data);
static void displace_set_labels (void);
static gint displace_get_label_size (void);
static gboolean displace_map_constrain (gint32 image_id,
gint32 drawable_id,
gpointer data);
static gdouble displace_map_give_value (guchar *ptr,
gint alpha,
gint bytes);
/***** Local vars *****/
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static DisplaceVals dvals =
{
20.0, /* amount_x */
20.0, /* amount_y */
TRUE, /* do_x */
TRUE, /* do_y */
-1, /* displace_map_x */
-1, /* displace_map_y */
GIMP_PIXEL_FETCHER_EDGE_WRAP, /* displace_type */
CARTESIAN_MODE /* mode */
};
/***** Variables *****/
static GtkWidget *preview = NULL;
static GtkWidget *toggle_x = NULL;
static GtkWidget *toggle_y = NULL;
static const gchar *mtext[][2] =
{
{ N_("_X displacement"), N_("_Pinch") },
{ N_("_Y displacement"), N_("_Whirl") }
};
/***** Functions *****/
MAIN ()
static void
query (void)
{
static const GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "run-mode", "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
{ GIMP_PDB_IMAGE, "image", "Input image (unused)" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
{ GIMP_PDB_FLOAT, "amount-x", "Displace multiplier for X or radial direction" },
{ GIMP_PDB_FLOAT, "amount-y", "Displace multiplier for Y or tangent (degrees) direction" },
{ GIMP_PDB_INT32, "do-x", "Displace in X or radial direction?" },
{ GIMP_PDB_INT32, "do-y", "Displace in Y or tangent direction?" },
{ GIMP_PDB_DRAWABLE, "displace-map-x", "Displacement map for X or radial direction" },
{ GIMP_PDB_DRAWABLE, "displace-map-y", "Displacement map for Y or tangent direction" },
{ GIMP_PDB_INT32, "displace-type", "Edge behavior { WRAP (0), SMEAR (1), BLACK (2) }" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Displace pixels as indicated by displacement maps"),
"Displaces the contents of the specified drawable "
"by the amounts specified by 'amount-x' and "
"'amount-y' multiplied by the luminance of "
"corresponding pixels in the 'displace-map' "
"drawables.",
"Stephen Robert Norris & (ported to 1.0 by) "
"Spencer Kimball",
"Stephen Robert Norris",
"1996",
N_("_Displace..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Filters/Map");
gimp_install_procedure ("plug-in-displace-polar",
"Displace the contents of the specified drawable",
"Just like plug-in-displace but working in "
"polar coordinates. The drawable is whirled and "
"pinched according to the map.",
"Stephen Robert Norris & (ported to 1.0 by) "
"Spencer Kimball",
"Stephen Robert Norris",
"1996",
"Displace Polar",
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpDrawable *drawable;
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
run_mode = param[0].data.d_int32;
INIT_I18N ();
/* Get the specified drawable */
drawable = gimp_drawable_get (param[2].data.d_drawable);
/* set the tile cache size */
gimp_tile_cache_ntiles (TILE_CACHE_SIZE);
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &dvals);
/* First acquire information with a dialog */
if (! displace_dialog (drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 10)
{
status = GIMP_PDB_CALLING_ERROR;
}
else
{
dvals.amount_x = param[3].data.d_float;
dvals.amount_y = param[4].data.d_float;
dvals.do_x = param[5].data.d_int32;
dvals.do_y = param[6].data.d_int32;
dvals.displace_map_x = param[7].data.d_int32;
dvals.displace_map_y = param[8].data.d_int32;
dvals.displace_type = param[9].data.d_int32;
dvals.mode = (strcmp (name, "plug-in-displace-polar") == 0 ?
POLAR_MODE : CARTESIAN_MODE);
}
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &dvals);
break;
default:
break;
}
if (status == GIMP_PDB_SUCCESS)
{
if (dvals.displace_map_x != -1 &&
(gimp_drawable_width (dvals.displace_map_x) != drawable->width ||
gimp_drawable_height (dvals.displace_map_x) != drawable->height))
status = GIMP_PDB_CALLING_ERROR;
}
if (status == GIMP_PDB_SUCCESS)
{
if (dvals.displace_map_y != -1 &&
(gimp_drawable_width (dvals.displace_map_y) != drawable->width ||
gimp_drawable_height (dvals.displace_map_y) != drawable->height))
status = GIMP_PDB_CALLING_ERROR;
}
if (status == GIMP_PDB_SUCCESS && (dvals.do_x || dvals.do_y))
{
gimp_progress_init (_("Displacing"));
/* run the displace effect */
displace (drawable, NULL);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PLUG_IN_PROC, &dvals, sizeof (DisplaceVals));
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static gboolean
displace_dialog (GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *table;
GtkWidget *spinbutton;
GtkObject *adj;
GtkWidget *combo;
GtkWidget *hbox;
GtkWidget *frame;
GtkWidget *wrap;
GtkWidget *smear;
GtkWidget *black;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, FALSE);
dialog = gimp_dialog_new (_("Displace"), 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);
gimp_window_set_transient (GTK_WINDOW (dialog));
main_vbox = gtk_vbox_new (FALSE, 12);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);
gtk_container_add (GTK_CONTAINER (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
main_vbox);
gtk_widget_show (main_vbox);
preview = gimp_drawable_preview_new (drawable, NULL);
gtk_box_pack_start (GTK_BOX (main_vbox), preview, TRUE, TRUE, 0);
gtk_widget_show (preview);
g_signal_connect_swapped (preview, "invalidated",
G_CALLBACK (displace),
drawable);
/* The main table */
table = gtk_table_new (3, 2, FALSE);
gtk_table_set_row_spacings (GTK_TABLE (table), 12);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_box_pack_start (GTK_BOX (main_vbox), table, FALSE, FALSE, 0);
/* X options */
toggle_x = gtk_check_button_new_with_mnemonic (_("_X displacement:"));
gtk_table_attach (GTK_TABLE (table), toggle_x, 0, 1, 0, 1,
GTK_FILL, GTK_FILL, 0, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle_x), dvals.do_x);
gtk_widget_show (toggle_x);
g_signal_connect (toggle_x, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&dvals.do_x);
g_signal_connect_swapped (toggle_x, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
spinbutton = gimp_spin_button_new (&adj, dvals.amount_x,
(gint) drawable->width * -2,
drawable->width * 2,
1, 10, 0, 1, 2);
gtk_table_attach (GTK_TABLE (table), spinbutton, 1, 2, 0, 1,
GTK_FILL, GTK_FILL, 0, 0);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.amount_x);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_widget_set_sensitive (spinbutton, dvals.do_x);
g_object_set_data (G_OBJECT (toggle_x), "set_sensitive", spinbutton);
gtk_widget_show (spinbutton);
combo = gimp_drawable_combo_box_new (displace_map_constrain, drawable);
gimp_int_combo_box_connect (GIMP_INT_COMBO_BOX (combo), dvals.displace_map_x,
G_CALLBACK (gimp_int_combo_box_get_active),
&dvals.displace_map_x);
g_signal_connect_swapped (combo, "changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_table_attach (GTK_TABLE (table), combo, 2, 3, 0, 1,
GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);
gtk_widget_show (combo);
gtk_widget_set_sensitive (combo, dvals.do_x);
g_object_set_data (G_OBJECT (spinbutton), "set_sensitive", combo);
/* Y Options */
toggle_y = gtk_check_button_new_with_mnemonic (_("_Y displacement:"));
gtk_table_attach (GTK_TABLE (table), toggle_y, 0, 1, 1, 2,
GTK_FILL, GTK_FILL, 0, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle_y), dvals.do_y);
gtk_widget_show (toggle_y);
g_signal_connect (toggle_y, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&dvals.do_y);
g_signal_connect_swapped (toggle_y, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
spinbutton = gimp_spin_button_new (&adj, dvals.amount_y,
(gint) drawable->height * -2,
drawable->height * 2,
1, 10, 0, 1, 2);
gtk_table_attach (GTK_TABLE (table), spinbutton, 1, 2, 1, 2,
GTK_FILL, GTK_FILL, 0, 0);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.amount_y);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_widget_set_sensitive (spinbutton, dvals.do_y);
g_object_set_data (G_OBJECT (toggle_y), "set_sensitive", spinbutton);
gtk_widget_show (spinbutton);
combo = gimp_drawable_combo_box_new (displace_map_constrain, drawable);
gimp_int_combo_box_connect (GIMP_INT_COMBO_BOX (combo), dvals.displace_map_y,
G_CALLBACK (gimp_int_combo_box_get_active),
&dvals.displace_map_y);
g_signal_connect_swapped (combo, "changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_table_attach (GTK_TABLE (table), combo, 2, 3, 1, 2,
GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);
gtk_widget_show (combo);
gtk_widget_set_sensitive (combo, dvals.do_y);
g_object_set_data (G_OBJECT (spinbutton), "set_sensitive", combo);
hbox = gtk_hbox_new (FALSE, 24);
gtk_box_pack_start (GTK_BOX (main_vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
frame = gimp_int_radio_group_new (TRUE, _("Displacement Mode"),
G_CALLBACK (displace_radio_update),
&dvals.mode, dvals.mode,
_("_Cartesian"), CARTESIAN_MODE, NULL,
_("_Polar"), POLAR_MODE, NULL,
NULL);
gtk_box_pack_start (GTK_BOX (hbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
frame = gimp_int_radio_group_new (TRUE, _("Edge Behavior"),
G_CALLBACK (gimp_radio_button_update),
&dvals.displace_type, dvals.displace_type,
_("_Wrap"), GIMP_PIXEL_FETCHER_EDGE_WRAP,
&wrap,
_("_Smear"), GIMP_PIXEL_FETCHER_EDGE_SMEAR,
&smear,
_("_Black"), GIMP_PIXEL_FETCHER_EDGE_BLACK,
&black,
NULL);
gtk_box_pack_start (GTK_BOX (hbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
g_signal_connect_swapped (wrap, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
g_signal_connect_swapped (smear, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
g_signal_connect_swapped (black, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
displace_set_labels ();
gtk_widget_show (table);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
/* The displacement is done here. */
static void
displace (GimpDrawable *drawable,
GimpPreview *preview)
{
GimpDrawable *map_x = NULL;
GimpDrawable *map_y = NULL;
GimpPixelRgn dest_rgn;
GimpPixelRgn map_x_rgn;
GimpPixelRgn map_y_rgn;
gpointer pr;
GimpPixelFetcher *pft;
gint width;
gint height;
gint bytes;
guchar *destrow, *dest;
guchar *mxrow, *mx;
guchar *myrow, *my;
guchar pixel[4][4];
gint x1, y1, x2, y2;
gint x, y;
gdouble cx, cy;
gint progress, max_progress;
gdouble amnt;
gdouble needx, needy;
gdouble radius, d_alpha;
gint xi, yi;
guchar values[4];
guchar val;
gint k;
gdouble xm_val, ym_val;
gint xm_alpha = 0;
gint ym_alpha = 0;
gint xm_bytes = 1;
gint ym_bytes = 1;
guchar *buffer = NULL;
gdouble pi;
/* initialize */
/* get rid of uninitialized warnings */
cx = cy = needx = needy = radius = d_alpha = 0.0;
pi = 4 * atan (1);
mxrow = NULL;
myrow = NULL;
pft = gimp_pixel_fetcher_new (drawable, FALSE);
gimp_pixel_fetcher_set_edge_mode (pft, dvals.displace_type);
bytes = drawable->bpp;
gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
width = x2 - x1;
height = y2 - y1;
if (dvals.mode == POLAR_MODE)
{
cx = x1 + width / 2.0;
cy = y1 + height / 2.0;
}
if (preview)
{
gimp_preview_get_position (preview, &x1, &y1);
gimp_preview_get_size (preview, &width, &height);
x2 = x1 + width;
y2 = y1 + height;
buffer = g_new (guchar, width * height * bytes);
}
progress = 0;
max_progress = width * height;
/*
* The algorithm used here is simple - see
* http://the-tech.mit.edu/KPT/Tips/KPT7/KPT7.html for a description.
*/
/* Get the drawables */
if (dvals.displace_map_x != -1 && dvals.do_x)
{
map_x = gimp_drawable_get (dvals.displace_map_x);
gimp_pixel_rgn_init (&map_x_rgn, map_x,
x1, y1, width, height, FALSE, FALSE);
if (gimp_drawable_has_alpha (map_x->drawable_id))
xm_alpha = 1;
xm_bytes = gimp_drawable_bpp (map_x->drawable_id);
}
if (dvals.displace_map_y != -1 && dvals.do_y)
{
map_y = gimp_drawable_get (dvals.displace_map_y);
gimp_pixel_rgn_init (&map_y_rgn, map_y,
x1, y1, width, height, FALSE, FALSE);
if (gimp_drawable_has_alpha (map_y->drawable_id))
ym_alpha = 1;
ym_bytes = gimp_drawable_bpp (map_y->drawable_id);
}
gimp_pixel_rgn_init (&dest_rgn, drawable,
x1, y1, width, height,
preview == NULL, preview == NULL);
/* Register the pixel regions */
if (dvals.do_x && dvals.do_y)
pr = gimp_pixel_rgns_register (3, &dest_rgn, &map_x_rgn, &map_y_rgn);
else if (dvals.do_x)
pr = gimp_pixel_rgns_register (2, &dest_rgn, &map_x_rgn);
else if (dvals.do_y)
pr = gimp_pixel_rgns_register (2, &dest_rgn, &map_y_rgn);
else
pr = NULL;
for (pr = pr; pr != NULL; pr = gimp_pixel_rgns_process (pr))
{
destrow = dest_rgn.data;
if (dvals.do_x)
mxrow = map_x_rgn.data;
if (dvals.do_y)
myrow = map_y_rgn.data;
for (y = dest_rgn.y; y < (dest_rgn.y + dest_rgn.h); y++)
{
if (preview)
dest = buffer + ((y - y1) * width + (dest_rgn.x - x1)) * bytes;
else
dest = destrow;
mx = mxrow;
my = myrow;
/*
* We could move the displacement image address calculation
* out of here, but when we can have different sized
* displacement and destination images we'd have to move it
* back anyway.
*/
for (x = dest_rgn.x; x < (dest_rgn.x + dest_rgn.w); x++)
{
if (dvals.do_x)
{
xm_val = displace_map_give_value(mx, xm_alpha, xm_bytes);
amnt = dvals.amount_x * (xm_val - 127.5) / 127.5;
/* CARTESIAN_MODE == 0 - performance important here */
if (! dvals.mode)
{
needx = x + amnt;
}
else
{
radius = sqrt (SQR (x - cx) + SQR (y - cy)) + amnt;
}
mx += xm_bytes;
}
else
{
if (! dvals.mode)
needx = x;
else
radius = sqrt ((x - cx) * (x - cx) + (y - cy) * (y - cy));
}
if (dvals.do_y)
{
ym_val = displace_map_give_value(my, ym_alpha, ym_bytes);
amnt = dvals.amount_y * (ym_val - 127.5) / 127.5;
if (! dvals.mode)
{
needy = y + amnt;
}
else
{
d_alpha = atan2 (x - cx, y - cy) + (dvals.amount_y / 180)
* pi * (ym_val - 127.5) / 127.5;
}
my += ym_bytes;
}
else
{
if (! dvals.mode)
needy = y;
else
d_alpha = atan2 (x - cx, y - cy);
}
if (dvals.mode)
{
needx = cx + radius * sin (d_alpha);
needy = cy + radius * cos (d_alpha);
}
/* Calculations complete; now copy the proper pixel */
if (needx >= 0.0)
xi = (int) needx;
else
xi = -((int) -needx + 1);
if (needy >= 0.0)
yi = (int) needy;
else
yi = -((int) -needy + 1);
gimp_pixel_fetcher_get_pixel (pft, xi, yi, pixel[0]);
gimp_pixel_fetcher_get_pixel (pft, xi + 1, yi, pixel[1]);
gimp_pixel_fetcher_get_pixel (pft, xi, yi + 1, pixel[2]);
gimp_pixel_fetcher_get_pixel (pft, xi + 1, yi + 1, pixel[3]);
for (k = 0; k < bytes; k++)
{
values[0] = pixel[0][k];
values[1] = pixel[1][k];
values[2] = pixel[2][k];
values[3] = pixel[3][k];
val = gimp_bilinear_8 (needx, needy, values);
*dest++ = val;
} /* for */
}
destrow += dest_rgn.rowstride;
if (dvals.do_x)
mxrow += map_x_rgn.rowstride;
if (dvals.do_y)
myrow += map_y_rgn.rowstride;
}
if (!preview)
{
progress += dest_rgn.w * dest_rgn.h;
gimp_progress_update ((double) progress / (double) max_progress);
}
} /* for */
gimp_pixel_fetcher_destroy (pft);
/* detach from the map drawables */
if (dvals.do_x)
gimp_drawable_detach (map_x);
if (dvals.do_y)
gimp_drawable_detach (map_y);
if (preview)
{
/* gimp_drawable_preview_draw_region (GIMP_DRAWABLE_PREVIEW (preview),
&dest_rgn);*/
gimp_preview_draw_buffer (preview, buffer, width * bytes);
g_free (buffer);
}
else
{
/* update the region */
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, width, height);
}
}
static gdouble
displace_map_give_value (guchar *pt,
gint alpha,
gint bytes)
{
gdouble ret, val_alpha;
if (bytes >= 3)
ret = GIMP_RGB_LUMINANCE (pt[0], pt[1], pt[2]);
else
ret = (gdouble) *pt;
if (alpha)
{
val_alpha = pt[bytes - 1];
ret = ((ret - 127.5) * val_alpha / 255.0) + 127.5;
}
return ret;
}
/* Displace interface functions */
static gboolean
displace_map_constrain (gint32 image_id,
gint32 drawable_id,
gpointer data)
{
GimpDrawable *drawable = data;
return (gimp_drawable_width (drawable_id) == drawable->width &&
gimp_drawable_height (drawable_id) == drawable->height);
}
static void
displace_radio_update (GtkWidget *widget,
gpointer data)
{
gimp_radio_button_update (widget, data);
displace_set_labels ();
gimp_preview_invalidate (GIMP_PREVIEW (preview));
}
static void
displace_set_labels (void)
{
/* get the max. possible size of both check-buttons */
gint label_maxwidth = displace_get_label_size();
gtk_button_set_label (GTK_BUTTON (toggle_x),
gettext (mtext[0][dvals.mode]));
gtk_button_set_label (GTK_BUTTON (toggle_y),
gettext (mtext[1][dvals.mode]));
/* "displace_get_label_size()" must be called before */
gtk_widget_set_size_request (toggle_x, label_maxwidth, -1);
gtk_widget_set_size_request (toggle_y, label_maxwidth, -1);
}
static gint
displace_get_label_size (void)
{
static gint label_maxwidth = 0;
gint i, j;
if (!label_maxwidth)
for (i = 0; i < 2; i++)
for (j = 0; j < 2; j++)
{
GtkRequisition requisition;
gtk_button_set_label (GTK_BUTTON (toggle_x), gettext (mtext[i][j]));
gtk_widget_size_request (toggle_x, &requisition);
if (requisition.width > label_maxwidth)
label_maxwidth = requisition.width;
}
return label_maxwidth;
}
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