/* Warp --- image filter plug-in for GIMP
* Copyright (C) 1997 John P. Beale
* Much of the 'warp' is from the Displace plug-in: 1996 Stephen Robert Norris
* Much of the 'displace' code taken in turn from the pinch plug-in
* which is 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 .
*
* You can contact me (the warp author) at beale@best.com
* Please send me any patches or enhancements to this code.
* You can contact the original GIMP authors at gimp@xcf.berkeley.edu
*
* --------------------------------------------------------------------
* Warp Program structure: after running the user interface and setting the
* parameters, warp generates a brand-new image (later to be deleted
* before the user ever sees it) which contains two grayscale layers,
* representing the X and Y gradients of the "control" image. For this
* purpose, all channels of the control image are summed for a scalar
* value at each pixel coordinate for the gradient operation.
*
* The X,Y components of the calculated gradient are then used to
* displace pixels from the source image into the destination
* image. The displacement vector is rotated a user-specified amount
* first. This displacement operation happens iteratively, generating
* a new displaced image from each prior image.
* -------------------------------------------------------------------
*
* Revision History:
* Version 0.37 12/19/98 Fixed Tooltips and freeing memory
* Version 0.36 11/9/97 Changed XY vector layers back to own image
* fixed 'undo' problem (hopefully)
*
* Version 0.35 11/3/97 Added vector-map, mag-map, grad-map to
* diff vector instead of separate operation
* further futzing with drawable updates
* starting adding tooltips
*
* Version 0.34 10/30/97 'Fixed' drawable update problem
* Added 16-bit resolution to differential map
* Added substep increments for finer control
*
* Version 0.33 10/26/97 Added 'angle increment' to user interface
*
* Version 0.32 10/25/97 Added magnitude control map (secondary control)
* Changed undo behavior to be one undo-step per warp call.
*
* Version 0.31 10/25/97 Fixed src/dest pixregions so program works
* with multiple-layer images. Still don't know
* exactly what I did to fix it :-/ Also, added 'color' option
* for border pixels to use the current selected foreground color.
*
* Version 0.3 10/20/97 Initial release for Gimp 0.99.xx
*/
#include "config.h"
#include
#include
#include "libgimp/stdplugins-intl.h"
/* Some useful macros */
#define PLUG_IN_PROC "plug-in-warp"
#define PLUG_IN_BINARY "warp"
#define PLUG_IN_ROLE "gimp-warp"
#define ENTRY_WIDTH 75
#define TILE_CACHE_SIZE 30 /* was 48. There is a cache flush problem in GIMP preventing sequential updates */
#define MIN_ARGS 6 /* minimum number of arguments required */
enum
{
WRAP,
SMEAR,
BLACK,
COLOR
};
typedef struct
{
gdouble amount;
gint warp_map;
gint iter;
gdouble dither;
gdouble angle;
gint wrap_type;
gint mag_map;
gint mag_use;
gint substeps;
gint grad_map;
gdouble grad_scale;
gint vector_map;
gdouble vector_scale;
gdouble vector_angle;
} WarpVals;
/*
* 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 blur16 (GimpDrawable *drawable);
static void diff (GimpDrawable *drawable,
gint32 *xl_id,
gint32 *yl_id);
static void diff_prepare_row (GimpPixelRgn *pixel_rgn,
guchar *data,
gint x,
gint y,
gint w);
static void warp_one (GimpDrawable *draw,
GimpDrawable *new,
GimpDrawable *map_x,
GimpDrawable *map_y,
GimpDrawable *mag_draw,
gboolean first_time,
gint step);
static void warp (GimpDrawable *drawable);
static gboolean warp_dialog (GimpDrawable *drawable);
static GimpTile *warp_pixel (GimpDrawable *drawable,
GimpTile *tile,
gint width,
gint height,
gint x1,
gint y1,
gint x2,
gint y2,
gint x,
gint y,
gint *row,
gint *col,
guchar *pixel);
static gboolean warp_map_constrain (gint32 image_id,
gint32 drawable_id,
gpointer data);
static gdouble warp_map_mag_give_value (guchar *pt,
gint alpha,
gint bytes);
/* -------------------------------------------------------------------------- */
/* Variables global over entire plug-in scope */
/* -------------------------------------------------------------------------- */
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static WarpVals dvals =
{
10.0, /* amount */
-1, /* warp_map */
5, /* iterations */
0.0, /* dither */
90.0, /* angle */
WRAP, /* wrap_type */
-1, /* mag_map */
FALSE, /* mag_use */
1, /* substeps */
-1, /* grad_map */
0.0, /* grad_scale */
-1, /* vector_map */
0.0, /* vector_scale */
0.0 /* vector_angle */
};
/* -------------------------------------------------------------------------- */
static gint progress = 0; /* progress indicator bar */
static guint tile_width, tile_height; /* size of an image tile */
static GimpRunMode run_mode; /* interactive, non-, etc. */
static guchar color_pixel[4] = {0, 0, 0, 255}; /* current fg color */
/* -------------------------------------------------------------------------- */
/***** 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", "Pixel displacement multiplier" },
{ GIMP_PDB_DRAWABLE, "warp-map", "Displacement control map" },
{ GIMP_PDB_INT32, "iter", "Iteration count (last required argument)" },
{ GIMP_PDB_FLOAT, "dither", "Random dither amount (first optional argument)" },
{ GIMP_PDB_FLOAT, "angle", "Angle of gradient vector rotation" },
{ GIMP_PDB_INT32, "wrap-type", "Edge behavior: { WRAP (0), SMEAR (1), BLACK (2), COLOR (3) }" },
{ GIMP_PDB_DRAWABLE, "mag-map", "Magnitude control map" },
{ GIMP_PDB_INT32, "mag-use", "Use magnitude map: { FALSE (0), TRUE (1) }" },
{ GIMP_PDB_INT32, "substeps", "Substeps between image updates" },
{ GIMP_PDB_INT32, "grad-map", "Gradient control map" },
{ GIMP_PDB_FLOAT, "grad-scale", "Scaling factor for gradient map (0=don't use)" },
{ GIMP_PDB_INT32, "vector-map", "Fixed vector control map" },
{ GIMP_PDB_FLOAT, "vector-scale", "Scaling factor for fixed vector map (0=don't use)" },
{ GIMP_PDB_FLOAT, "vector-angle", "Angle for fixed vector map" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Twist or smear image in many different ways"),
"Smears an image along vector paths calculated as "
"the gradient of a separate control matrix. The "
"effect can look like brushstrokes of acrylic or "
"watercolor paint, in some cases.",
"John P. Beale",
"John P. Beale",
"1997",
N_("_Warp..."),
"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];
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
GimpDrawable *drawable;
GimpRGB color;
run_mode = param[0].data.d_int32;
INIT_I18N ();
tile_width = gimp_tile_width (); /* initialize some globals */
tile_height = gimp_tile_height ();
/* get currently selected foreground pixel color */
gimp_context_get_foreground (&color);
gimp_rgb_get_uchar (&color,
&color_pixel[0],
&color_pixel[1],
&color_pixel[2]);
/* Get the specified drawable */
drawable = gimp_drawable_get (param[2].data.d_drawable);
*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 (! warp_dialog (drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure minimum args
* (mode, image, draw, amount, warp_map, iter) are there
*/
if (nparams < MIN_ARGS)
{
status = GIMP_PDB_CALLING_ERROR;
}
else
{
gint pcnt = MIN_ARGS;
dvals.amount = param[3].data.d_float;
dvals.warp_map = param[4].data.d_int32;
dvals.iter = param[5].data.d_int32;
if (nparams > pcnt++) dvals.dither = param[6].data.d_float;
if (nparams > pcnt++) dvals.angle = param[7].data.d_float;
if (nparams > pcnt++) dvals.wrap_type = param[8].data.d_int32;
if (nparams > pcnt++) dvals.mag_map = param[9].data.d_int32;
if (nparams > pcnt++) dvals.mag_use = param[10].data.d_int32;
if (nparams > pcnt++) dvals.substeps = param[11].data.d_int32;
if (nparams > pcnt++) dvals.grad_map = param[12].data.d_int32;
if (nparams > pcnt++) dvals.grad_scale = param[13].data.d_float;
if (nparams > pcnt++) dvals.vector_map = param[14].data.d_int32;
if (nparams > pcnt++) dvals.vector_scale = param[15].data.d_float;
if (nparams > pcnt++) dvals.vector_angle = param[16].data.d_float;
}
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)
{
/* set the tile cache size */
gimp_tile_cache_ntiles (TILE_CACHE_SIZE);
/* run the warp effect */
warp (drawable);
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PLUG_IN_PROC, &dvals, sizeof (WarpVals));
}
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
gimp_drawable_detach (drawable);
values[0].data.d_status = status;
}
static gboolean
warp_dialog (GimpDrawable *drawable)
{
GtkWidget *dlg;
GtkWidget *vbox;
GtkWidget *label;
GtkWidget *toggle;
GtkWidget *toggle_hbox;
GtkWidget *frame;
GtkWidget *table;
GtkWidget *spinbutton;
GtkObject *adj;
GtkWidget *combo;
GtkSizeGroup *label_group;
GtkSizeGroup *spin_group;
GSList *group = NULL;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, FALSE);
dlg = gimp_dialog_new (_("Warp"), PLUG_IN_ROLE,
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 (dlg),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
gimp_window_set_transient (GTK_WINDOW (dlg));
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 12);
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dlg))),
vbox, TRUE, TRUE, 0);
gtk_widget_show (vbox);
frame = gimp_frame_new (_("Basic Options"));
gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
table = gtk_table_new (3, 3, FALSE);
gtk_table_set_row_spacings (GTK_TABLE (table), 6);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_table_set_col_spacing (GTK_TABLE (table), 1, 12);
gtk_container_add (GTK_CONTAINER (frame), table);
gtk_widget_show (table);
spin_group = gtk_size_group_new (GTK_SIZE_GROUP_HORIZONTAL);
label_group = gtk_size_group_new (GTK_SIZE_GROUP_HORIZONTAL);
/* amount, iter */
spinbutton = gimp_spin_button_new (&adj, dvals.amount,
-1000, 1000, /* ??? */
1, 10, 0, 1, 2);
gtk_size_group_add_widget (spin_group, spinbutton);
g_object_unref (spin_group);
label = gimp_table_attach_aligned (GTK_TABLE (table), 0, 0,
_("Step size:"), 0.0, 0.5,
spinbutton, 1, FALSE);
gtk_size_group_add_widget (label_group, label);
g_object_unref (label_group);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.amount);
spinbutton = gimp_spin_button_new (&adj, dvals.iter,
1, 100, 1, 5, 0, 1, 0);
gtk_size_group_add_widget (spin_group, spinbutton);
label = gimp_table_attach_aligned (GTK_TABLE (table), 0, 1,
_("Iterations:"), 0.0, 0.5,
spinbutton, 1, FALSE);
gtk_size_group_add_widget (label_group, label);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_int_adjustment_update),
&dvals.iter);
/* Displacement map menu */
label = gtk_label_new (_("Displacement map:"));
gtk_misc_set_alignment (GTK_MISC (label), 0.0, 1.0);
gtk_table_attach (GTK_TABLE (table), label, 2, 3, 0, 1,
GTK_FILL, GTK_FILL, 0, 0);
gtk_widget_show (label);
combo = gimp_drawable_combo_box_new (warp_map_constrain, drawable);
gimp_int_combo_box_connect (GIMP_INT_COMBO_BOX (combo), dvals.warp_map,
G_CALLBACK (gimp_int_combo_box_get_active),
&dvals.warp_map);
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);
/* ======================================================================= */
/* Displacement Type */
label = gtk_label_new (_("On edges:"));
gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.0);
gtk_table_attach (GTK_TABLE (table), label, 0, 1, 2, 3,
GTK_FILL, GTK_FILL, 0, 0);
gtk_widget_show (label);
toggle_hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
gtk_table_attach (GTK_TABLE (table), toggle_hbox, 1, 3, 2, 3,
GTK_FILL, GTK_FILL, 0, 0);
gtk_widget_show (toggle_hbox);
toggle = gtk_radio_button_new_with_label (group, _("Wrap"));
group = gtk_radio_button_get_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start (GTK_BOX (toggle_hbox), toggle, FALSE, FALSE, 0);
gtk_widget_show (toggle);
g_object_set_data (G_OBJECT (toggle), "gimp-item-data",
GINT_TO_POINTER (WRAP));
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_radio_button_update),
&dvals.wrap_type);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
dvals.wrap_type == WRAP);
toggle = gtk_radio_button_new_with_label (group, _("Smear"));
group = gtk_radio_button_get_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start (GTK_BOX (toggle_hbox), toggle, FALSE, FALSE, 0);
gtk_widget_show (toggle);
g_object_set_data (G_OBJECT (toggle), "gimp-item-data",
GINT_TO_POINTER (SMEAR));
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_radio_button_update),
&dvals.wrap_type);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
dvals.wrap_type == SMEAR);
toggle = gtk_radio_button_new_with_label (group, _("Black"));
group = gtk_radio_button_get_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start (GTK_BOX (toggle_hbox), toggle, FALSE, FALSE, 0);
gtk_widget_show (toggle);
g_object_set_data (G_OBJECT (toggle), "gimp-item-data",
GINT_TO_POINTER (BLACK));
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_radio_button_update),
&dvals.wrap_type);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
dvals.wrap_type == BLACK);
toggle = gtk_radio_button_new_with_label (group, _("Foreground color"));
group = gtk_radio_button_get_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start (GTK_BOX (toggle_hbox), toggle, FALSE, FALSE, 0);
gtk_widget_show (toggle);
g_object_set_data (G_OBJECT (toggle), "gimp-item-data",
GINT_TO_POINTER (COLOR));
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_radio_button_update),
&dvals.wrap_type);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
dvals.wrap_type == COLOR);
/* -------------------------------------------------------------------- */
/* --------- The secondary table -------------------------- */
frame = gimp_frame_new (_("Advanced Options"));
gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
table = gtk_table_new (3, 3, FALSE);
gtk_table_set_row_spacings (GTK_TABLE (table), 6);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_table_set_col_spacing (GTK_TABLE (table), 1, 12);
gtk_container_add (GTK_CONTAINER (frame), table);
gtk_widget_show (table);
spinbutton = gimp_spin_button_new (&adj, dvals.dither,
0, 100, 1, 10, 0, 1, 2);
gtk_size_group_add_widget (spin_group, spinbutton);
label = gimp_table_attach_aligned (GTK_TABLE (table), 0, 0,
_("Dither size:"), 0.0, 0.5,
spinbutton, 1, FALSE);
gtk_size_group_add_widget (label_group, label);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.dither);
spinbutton = gimp_spin_button_new (&adj, dvals.angle,
0, 360, 1, 15, 0, 1, 1);
gtk_size_group_add_widget (spin_group, spinbutton);
label = gimp_table_attach_aligned (GTK_TABLE (table), 0, 1,
_("Rotation angle:"), 0.0, 0.5,
spinbutton, 1, FALSE);
gtk_size_group_add_widget (label_group, label);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.angle);
spinbutton = gimp_spin_button_new (&adj, dvals.substeps,
1, 100, 1, 5, 0, 1, 0);
gtk_size_group_add_widget (spin_group, spinbutton);
label = gimp_table_attach_aligned (GTK_TABLE (table), 0, 2,
_("Substeps:"), 0.0, 0.5,
spinbutton, 1, FALSE);
gtk_size_group_add_widget (label_group, label);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_int_adjustment_update),
&dvals.substeps);
/* Magnitude map menu */
label = gtk_label_new (_("Magnitude map:"));
gtk_misc_set_alignment (GTK_MISC (label), 0.0, 1.0);
gtk_table_attach (GTK_TABLE (table), label, 2, 3, 0, 1,
GTK_FILL, GTK_FILL, 0, 0);
gtk_widget_show (label);
combo = gimp_drawable_combo_box_new (warp_map_constrain, drawable);
gimp_int_combo_box_connect (GIMP_INT_COMBO_BOX (combo), dvals.mag_map,
G_CALLBACK (gimp_int_combo_box_get_active),
&dvals.mag_map);
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);
/* Magnitude Usage */
toggle_hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
gtk_container_set_border_width (GTK_CONTAINER (toggle_hbox), 1);
gtk_table_attach (GTK_TABLE (table), toggle_hbox, 2, 3, 2, 3,
GTK_FILL, GTK_FILL, 0, 0);
gtk_widget_show (toggle_hbox);
toggle = gtk_check_button_new_with_label (_("Use magnitude map"));
gtk_box_pack_start (GTK_BOX (toggle_hbox), toggle, FALSE, FALSE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), dvals.mag_use);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&dvals.mag_use);
/* -------------------------------------------------------------------- */
/* --------- The "other" table -------------------------- */
frame = gimp_frame_new (_("More Advanced Options"));
gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
table = gtk_table_new (3, 3, FALSE);
gtk_table_set_row_spacings (GTK_TABLE (table), 6);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_table_set_col_spacing (GTK_TABLE (table), 1, 12);
gtk_container_add (GTK_CONTAINER (frame), table);
gtk_widget_show (table);
spinbutton = gimp_spin_button_new (&adj, dvals.grad_scale,
-1000, 1000, /* ??? */
0.01, 0.1, 0, 1, 3);
gtk_size_group_add_widget (spin_group, spinbutton);
label = gimp_table_attach_aligned (GTK_TABLE (table), 0, 0,
_("Gradient scale:"), 0.0, 0.5,
spinbutton, 1, FALSE);
gtk_size_group_add_widget (label_group, label);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.grad_scale);
/* --------- Gradient map menu ---------------- */
combo = gimp_drawable_combo_box_new (warp_map_constrain, drawable);
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);
gimp_int_combo_box_connect (GIMP_INT_COMBO_BOX (combo), dvals.grad_map,
G_CALLBACK (gimp_int_combo_box_get_active),
&dvals.grad_map);
gimp_help_set_help_data (combo, _("Gradient map selection menu"), NULL);
/* ---------------------------------------------- */
spinbutton = gimp_spin_button_new (&adj, dvals.vector_scale,
-1000, 1000, /* ??? */
0.01, 0.1, 0, 1, 3);
gtk_size_group_add_widget (spin_group, spinbutton);
label = gimp_table_attach_aligned (GTK_TABLE (table), 0, 1,
_("Vector mag:"), 0.0, 0.5,
spinbutton, 1, FALSE);
gtk_size_group_add_widget (label_group, label);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.vector_scale);
/* -------------------------------------------------------- */
spinbutton = gimp_spin_button_new (&adj, dvals.vector_angle,
0, 360, 1, 15, 0, 1, 1);
gtk_size_group_add_widget (spin_group, spinbutton);
label = gimp_table_attach_aligned (GTK_TABLE (table), 0, 2,
_("Angle:"), 0.0, 0.5,
spinbutton, 1, FALSE);
gtk_size_group_add_widget (label_group, label);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.vector_angle);
/* --------- Vector map menu ---------------- */
combo = gimp_drawable_combo_box_new (warp_map_constrain, drawable);
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);
gimp_int_combo_box_connect (GIMP_INT_COMBO_BOX (combo), dvals.vector_map,
G_CALLBACK (gimp_int_combo_box_get_active),
&dvals.vector_map);
gimp_help_set_help_data (combo,
_("Fixed-direction-vector map selection menu"),
NULL);
gtk_widget_show (dlg);
run = (gimp_dialog_run (GIMP_DIALOG (dlg)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dlg);
return run;
}
/* ---------------------------------------------------------------------- */
static void
blur16 (GimpDrawable *drawable)
{
/* blur a 2-or-more byte-per-pixel drawable,
* 1st 2 bytes interpreted as a 16-bit height field.
*/
GimpPixelRgn srcPR, destPR;
gint width, height;
gint src_bytes;
gint dest_bytes;
gint dest_bytes_inc;
gint offb, off1;
guchar *dest, *d; /* pointers to rows of X and Y diff. data */
guchar *prev_row, *pr;
guchar *cur_row, *cr;
guchar *next_row, *nr;
guchar *tmp;
gint row, col; /* relating to indexing into pixel row arrays */
gint x1, y1, x2, y2;
gdouble pval; /* average pixel value of pixel & neighbors */
/* --------------------------------------- */
if (! gimp_drawable_mask_intersect (drawable->drawable_id,
&x1, &y1, &width, &height))
return;
x2 = x1 + width;
y2 = y1 + height;
width = drawable->width; /* size of input drawable*/
height = drawable->height;
src_bytes = drawable->bpp; /* bytes per pixel in SOURCE drawable, must be 2 or more */
dest_bytes = drawable->bpp; /* bytes per pixel in SOURCE drawable, >= 2 */
dest_bytes_inc = dest_bytes - 2; /* this is most likely zero, but I guess it's more conservative... */
/* allocate row buffers for source & dest. data */
prev_row = g_new (guchar, (x2 - x1 + 2) * src_bytes);
cur_row = g_new (guchar, (x2 - x1 + 2) * src_bytes);
next_row = g_new (guchar, (x2 - x1 + 2) * src_bytes);
dest = g_new (guchar, (x2 - x1) * src_bytes);
/* initialize the pixel regions (read from source, write into dest) */
gimp_pixel_rgn_init (&srcPR, drawable, 0, 0, width, height, FALSE, FALSE);
gimp_pixel_rgn_init (&destPR, drawable, 0, 0, width, height, TRUE, TRUE);
pr = prev_row + src_bytes; /* row arrays are prepared for indexing to -1 (!) */
cr = cur_row + src_bytes;
nr = next_row + src_bytes;
diff_prepare_row (&srcPR, pr, x1, y1, (x2 - x1));
diff_prepare_row (&srcPR, cr, x1, y1+1, (x2 - x1));
/* loop through the rows, applying the smoothing function */
for (row = y1; row < y2; row++)
{
/* prepare the next row */
diff_prepare_row (&srcPR, nr, x1, row + 1, (x2 - x1));
d = dest;
for (col = 0; col < (x2 - x1); col++) /* over columns of pixels */
{
offb = col*src_bytes; /* base of byte pointer offset */
off1 = offb+1; /* offset into row arrays */
pval = (256.0 * pr[offb - src_bytes] + pr[off1 - src_bytes] +
256.0 * pr[offb] + pr[off1] +
256.0 * pr[offb + src_bytes] + pr[off1 + src_bytes] +
256.0 * cr[offb - src_bytes] + cr[off1 - src_bytes] +
256.0 * cr[offb] + cr[off1] +
256.0 * cr[offb + src_bytes] + cr[off1 + src_bytes] +
256.0 * nr[offb - src_bytes] + nr[off1 - src_bytes] +
256.0 * nr[offb] + nr[off1] +
256.0 * nr[offb + src_bytes]) + nr[off1 + src_bytes];
pval /= 9.0; /* take the average */
*d++ = (guchar) (((gint) pval) >> 8); /* high-order byte */
*d++ = (guchar) (((gint) pval) % 256); /* low-order byte */
d += dest_bytes_inc; /* move data pointer on to next destination pixel */
}
/* store the dest */
gimp_pixel_rgn_set_row (&destPR, dest, x1, row, (x2 - x1));
/* shuffle the row pointers */
tmp = pr;
pr = cr;
cr = nr;
nr = tmp;
if ((row % 8) == 0)
gimp_progress_update ((double) row / (double) (y2 - y1));
}
gimp_progress_update (1.0);
/* update the region */
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, (x2 - x1), (y2 - y1));
g_free (prev_row); /* row buffers allocated at top of fn. */
g_free (cur_row);
g_free (next_row);
g_free (dest);
} /* end blur16() */
/* ====================================================================== */
/* Get one row of pixels from the PixelRegion and put them in 'data' */
static void
diff_prepare_row (GimpPixelRgn *pixel_rgn,
guchar *data,
gint x,
gint y,
gint w)
{
gint b;
y = CLAMP (y, 0, pixel_rgn->h - 1);
gimp_pixel_rgn_get_row (pixel_rgn, data, x, y, w);
/* Fill in edge pixels */
for (b = 0; b < pixel_rgn->bpp; b++)
{
data[b - (gint) pixel_rgn->bpp] = data[b];
data[w * pixel_rgn->bpp + b] = data[(w - 1) * pixel_rgn->bpp + b];
}
}
/* -------------------------------------------------------------------------- */
/* 'diff' combines the input drawables to prepare the two */
/* 16-bit (X,Y) vector displacement maps */
/* -------------------------------------------------------------------------- */
static void
diff (GimpDrawable *drawable,
gint32 *xl_id,
gint32 *yl_id)
{
GimpDrawable *draw_xd, *draw_yd; /* vector disp. drawables */
GimpDrawable *mdraw, *vdraw, *gdraw;
gint32 image_id; /* image holding X and Y diff. arrays */
gint32 new_image_id; /* image holding X and Y diff. layers */
gint32 layer_active; /* currently active layer */
gint32 xlayer_id, ylayer_id; /* individual X and Y layer ID numbers */
GimpPixelRgn srcPR, destxPR, destyPR;
GimpPixelRgn vecPR, magPR, gradPR;
gint width, height;
gint src_bytes;
gint mbytes = 0;
gint vbytes = 0;
gint gbytes = 0; /* bytes-per-pixel of various source drawables */
gint dest_bytes;
gint dest_bytes_inc;
gint do_gradmap = FALSE; /* whether to add in gradient of gradmap to final diff. map */
gint do_vecmap = FALSE; /* whether to add in a fixed vector scaled by the vector map */
gint do_magmap = FALSE; /* whether to multiply result by the magnitude map */
guchar *destx, *dx, *desty, *dy; /* pointers to rows of X and Y diff. data */
guchar *tmp;
guchar *prev_row, *pr;
guchar *cur_row, *cr;
guchar *next_row, *nr;
guchar *prev_row_g, *prg = NULL; /* pointers to gradient map data */
guchar *cur_row_g, *crg = NULL;
guchar *next_row_g, *nrg = NULL;
guchar *cur_row_v, *crv = NULL; /* pointers to vector map data */
guchar *cur_row_m, *crm = NULL; /* pointers to magnitude map data */
gint row, col, offb, off, bytes; /* relating to indexing into pixel row arrays */
gint x1, y1, x2, y2;
gint dvalx, dvaly; /* differential value at particular pixel */
gdouble tx, ty; /* temporary x,y differential value increments from gradmap, etc. */
gdouble rdx, rdy; /* x,y differential values: real #s */
gdouble rscalefac; /* scaling factor for x,y differential of 'curl' map */
gdouble gscalefac; /* scaling factor for x,y differential of 'gradient' map */
gdouble r, theta, dtheta; /* rectangular<-> spherical coordinate transform for vector rotation */
gdouble scale_vec_x, scale_vec_y; /* fixed vector X,Y component scaling factors */
/* ----------------------------------------------------------------------- */
if (dvals.grad_scale != 0.0)
do_gradmap = TRUE; /* add in gradient of gradmap if scale != 0.000 */
if (dvals.vector_scale != 0.0) /* add in gradient of vectormap if scale != 0.000 */
do_vecmap = TRUE;
do_magmap = (dvals.mag_use == TRUE); /* multiply by magnitude map if so requested */
/* Get the input area. This is the bounding box of the selection in
* the image (or the entire image if there is no selection). Only
* operating on the input area is simply an optimization. It doesn't
* need to be done for correct operation. (It simply makes it go
* faster, since fewer pixels need to be operated on).
*/
if (! gimp_drawable_mask_intersect (drawable->drawable_id,
&x1, &y1, &width, &height))
return;
x2 = x1 + width;
y2 = y1 + height;
/* Get the size of the input image. (This will/must be the same
* as the size of the output image.
*/
width = drawable->width;
height = drawable->height;
src_bytes = drawable->bpp;
/* -- Add two layers: X and Y Displacement vectors -- */
/* -- I'm using a RGB drawable and using the first two bytes for a
16-bit pixel value. This is either clever, or a kluge,
depending on your point of view. */
image_id = gimp_item_get_image (drawable->drawable_id);
layer_active = gimp_image_get_active_layer (image_id);
/* create new image for X,Y diff */
new_image_id = gimp_image_new (width, height, GIMP_RGB);
xlayer_id = gimp_layer_new (new_image_id, "Warp_X_Vectors",
width, height,
GIMP_RGB_IMAGE, 100.0, GIMP_NORMAL_MODE);
ylayer_id = gimp_layer_new (new_image_id, "Warp_Y_Vectors",
width, height,
GIMP_RGB_IMAGE, 100.0, GIMP_NORMAL_MODE);
draw_yd = gimp_drawable_get (ylayer_id);
draw_xd = gimp_drawable_get (xlayer_id);
gimp_image_insert_layer (new_image_id, xlayer_id, -1, 1);
gimp_image_insert_layer (new_image_id, ylayer_id, -1, 1);
gimp_drawable_fill (xlayer_id, GIMP_BACKGROUND_FILL);
gimp_drawable_fill (ylayer_id, GIMP_BACKGROUND_FILL);
gimp_image_set_active_layer (image_id, layer_active);
dest_bytes = draw_xd->bpp;
/* for a GRAYA drawable, I would expect this to be two bytes; any more would be excess */
dest_bytes_inc = dest_bytes - 2;
/* allocate row buffers for source & dest. data */
prev_row = g_new (guchar, (x2 - x1 + 2) * src_bytes);
cur_row = g_new (guchar, (x2 - x1 + 2) * src_bytes);
next_row = g_new (guchar, (x2 - x1 + 2) * src_bytes);
prev_row_g = g_new (guchar, (x2 - x1 + 2) * src_bytes);
cur_row_g = g_new (guchar, (x2 - x1 + 2) * src_bytes);
next_row_g = g_new (guchar, (x2 - x1 + 2) * src_bytes);
cur_row_v = g_new (guchar, (x2 - x1 + 2) * src_bytes); /* vector map */
cur_row_m = g_new (guchar, (x2 - x1 + 2) * src_bytes); /* magnitude map */
destx = g_new (guchar, (x2 - x1) * dest_bytes);
desty = g_new (guchar, (x2 - x1) * dest_bytes);
/* initialize the source and destination pixel regions */
/* 'curl' vector-rotation input */
gimp_pixel_rgn_init (&srcPR, drawable, 0, 0, width, height, FALSE, FALSE);
/* destination: X diff output */
gimp_pixel_rgn_init (&destxPR, draw_xd, 0, 0, width, height, TRUE, FALSE);
/* Y diff output */
gimp_pixel_rgn_init (&destyPR, draw_yd, 0, 0, width, height, TRUE, FALSE);
pr = prev_row + src_bytes;
cr = cur_row + src_bytes;
nr = next_row + src_bytes;
diff_prepare_row (&srcPR, pr, x1, y1, (x2 - x1));
diff_prepare_row (&srcPR, cr, x1, y1+1, (x2 - x1));
/* fixed-vector (x,y) component scale factors */
scale_vec_x = (dvals.vector_scale *
cos ((90 - dvals.vector_angle) * G_PI / 180.0) * 256.0 / 10);
scale_vec_y = (dvals.vector_scale *
sin ((90 - dvals.vector_angle) * G_PI / 180.0) * 256.0 / 10);
if (do_vecmap)
{
vdraw = gimp_drawable_get(dvals.vector_map);
vbytes = vdraw->bpp; /* bytes per pixel in SOURCE drawable */
/* fixed-vector scale-map */
gimp_pixel_rgn_init (&vecPR, vdraw, 0, 0, width, height, FALSE, FALSE);
crv = cur_row_v + vbytes;
diff_prepare_row (&vecPR, crv, x1, y1, (x2 - x1));
}
if (do_gradmap)
{
gdraw = gimp_drawable_get(dvals.grad_map);
gbytes = gdraw->bpp;
/* fixed-vector scale-map */
gimp_pixel_rgn_init (&gradPR, gdraw, 0, 0, width, height, FALSE, FALSE);
prg = prev_row_g + gbytes;
crg = cur_row_g + gbytes;
nrg = next_row_g + gbytes;
diff_prepare_row (&gradPR, prg, x1, y1 - 1, (x2 - x1));
diff_prepare_row (&gradPR, crg, x1, y1, (x2 - x1));
}
if (do_magmap)
{
mdraw = gimp_drawable_get(dvals.mag_map);
mbytes = mdraw->bpp;
/* fixed-vector scale-map */
gimp_pixel_rgn_init (&magPR, mdraw, 0, 0, width, height, FALSE, FALSE);
crm = cur_row_m + mbytes;
diff_prepare_row (&magPR, crm, x1, y1, (x2 - x1));
}
dtheta = dvals.angle * G_PI / 180.0;
/* note that '3' is rather arbitrary here. */
rscalefac = 256.0 / (3 * src_bytes);
/* scale factor for gradient map components */
gscalefac = dvals.grad_scale * 256.0 / (3 * gbytes);
/* loop through the rows, applying the differential convolution */
for (row = y1; row < y2; row++)
{
/* prepare the next row */
diff_prepare_row (&srcPR, nr, x1, row + 1, (x2 - x1));
if (do_magmap)
diff_prepare_row (&magPR, crm, x1, row + 1, (x2 - x1));
if (do_vecmap)
diff_prepare_row (&vecPR, crv, x1, row + 1, (x2 - x1));
if (do_gradmap)
diff_prepare_row (&gradPR, crg, x1, row + 1, (x2 - x1));
dx = destx;
dy = desty;
for (col = 0; col < (x2 - x1); col++) /* over columns of pixels */
{
rdx = 0.0;
rdy = 0.0;
ty = 0.0;
tx = 0.0;
offb = col * src_bytes; /* base of byte pointer offset */
for (bytes=0; bytes < src_bytes; bytes++) /* add all channels together */
{
off = offb+bytes; /* offset into row arrays */
rdx += ((gint) -pr[off - src_bytes] + (gint) pr[off + src_bytes] +
(gint) -2*cr[off - src_bytes] + (gint) 2*cr[off + src_bytes] +
(gint) -nr[off - src_bytes] + (gint) nr[off + src_bytes]);
rdy += ((gint) -pr[off - src_bytes] - (gint)2*pr[off] - (gint) pr[off + src_bytes] +
(gint) nr[off - src_bytes] + (gint)2*nr[off] + (gint) nr[off + src_bytes]);
}
rdx *= rscalefac; /* take average, then reduce. Assume max. rdx now 65535 */
rdy *= rscalefac; /* take average, then reduce */
theta = atan2(rdy,rdx); /* convert to polar, then back to rectang. coords */
r = sqrt(rdy*rdy + rdx*rdx);
theta += dtheta; /* rotate gradient vector by this angle (radians) */
rdx = r * cos(theta);
rdy = r * sin(theta);
if (do_gradmap)
{
offb = col*gbytes; /* base of byte pointer offset into pixel values (R,G,B,Alpha, etc.) */
for (bytes=0; bytes < src_bytes; bytes++) /* add all channels together */
{
off = offb+bytes; /* offset into row arrays */
tx += ((gint) -prg[off - gbytes] + (gint) prg[off + gbytes] +
(gint) -2*crg[off - gbytes] + (gint) 2*crg[off + gbytes] +
(gint) -nrg[off - gbytes] + (gint) nrg[off + gbytes]);
ty += ((gint) -prg[off - gbytes] - (gint)2*prg[off] - (gint) prg[off + gbytes] +
(gint) nrg[off - gbytes] + (gint)2*nrg[off] + (gint) nrg[off + gbytes]);
}
tx *= gscalefac;
ty *= gscalefac;
rdx += tx; /* add gradient component in to the other one */
rdy += ty;
} /* if (do_gradmap) */
if (do_vecmap)
{ /* add in fixed vector scaled by vec. map data */
tx = (gdouble) crv[col*vbytes]; /* use first byte only */
rdx += scale_vec_x * tx;
rdy += scale_vec_y * tx;
} /* if (do_vecmap) */
if (do_magmap)
{ /* multiply result by mag. map data */
tx = (gdouble) crm[col*mbytes];
rdx = (rdx * tx)/(255.0);
rdy = (rdy * tx)/(255.0);
} /* if do_magmap */
dvalx = rdx + (2<<14); /* take zero point to be 2^15, since this is two bytes */
dvaly = rdy + (2<<14);
if (dvalx < 0)
dvalx = 0;
if (dvalx > 65535)
dvalx = 65535;
*dx++ = (guchar) (dvalx >> 8); /* store high order byte in value channel */
*dx++ = (guchar) (dvalx % 256); /* store low order byte in alpha channel */
dx += dest_bytes_inc; /* move data pointer on to next destination pixel */
if (dvaly < 0)
dvaly = 0;
if (dvaly > 65535)
dvaly = 65535;
*dy++ = (guchar) (dvaly >> 8);
*dy++ = (guchar) (dvaly % 256);
dy += dest_bytes_inc;
} /* ------------------------------- for (col...) ---------------- */
/* store the dest */
gimp_pixel_rgn_set_row (&destxPR, destx, x1, row, (x2 - x1));
gimp_pixel_rgn_set_row (&destyPR, desty, x1, row, (x2 - x1));
/* swap around the pointers to row buffers */
tmp = pr;
pr = cr;
cr = nr;
nr = tmp;
if (do_gradmap)
{
tmp = prg;
prg = crg;
crg = nrg;
nrg = tmp;
}
if ((row % 8) == 0)
gimp_progress_update ((gdouble) row / (gdouble) (y2 - y1));
} /* for (row..) */
gimp_progress_update (1.0);
/* update the region */
gimp_drawable_flush (draw_xd);
gimp_drawable_flush (draw_yd);
gimp_drawable_update (draw_xd->drawable_id, x1, y1, (x2 - x1), (y2 - y1));
gimp_drawable_update (draw_yd->drawable_id, x1, y1, (x2 - x1), (y2 - y1));
gimp_displays_flush(); /* make sure layer is visible */
gimp_progress_init (_("Smoothing X gradient"));
blur16(draw_xd);
gimp_progress_init (_("Smoothing Y gradient"));
blur16(draw_yd);
g_free (prev_row); /* row buffers allocated at top of fn. */
g_free (cur_row);
g_free (next_row);
g_free (prev_row_g); /* row buffers allocated at top of fn. */
g_free (cur_row_g);
g_free (next_row_g);
g_free (cur_row_v);
g_free (cur_row_m);
g_free (destx);
g_free (desty);
*xl_id = xlayer_id; /* pass back the X and Y layer ID numbers */
*yl_id = ylayer_id;
} /* end diff() */
/* -------------------------------------------------------------------------- */
/* The Warp displacement is done here. */
/* -------------------------------------------------------------------------- */
static void
warp (GimpDrawable *orig_draw)
{
GimpDrawable *disp_map; /* Displacement map, ie, control array */
GimpDrawable *mag_draw; /* Magnitude multiplier factor map */
GimpDrawable *map_x;
GimpDrawable *map_y;
gboolean first_time = TRUE;
gint width;
gint height;
gint x1, y1, x2, y2;
gint32 xdlayer = -1;
gint32 ydlayer = -1;
gint32 image_ID;
/* index var. over all "warp" Displacement iterations */
gint warp_iter;
disp_map = gimp_drawable_get (dvals.warp_map);
mag_draw = gimp_drawable_get (dvals.mag_map);
/* calculate new X,Y Displacement image maps */
gimp_progress_init (_("Finding XY gradient"));
/* Get selection area */
if (! gimp_drawable_mask_intersect (orig_draw->drawable_id,
&x1, &y1, &width, &height))
return;
x2 = x1 + width;
y2 = y1 + height;
width = orig_draw->width;
height = orig_draw->height;
/* generate x,y differential images (arrays) */
diff (disp_map, &xdlayer, &ydlayer);
map_x = gimp_drawable_get (xdlayer);
map_y = gimp_drawable_get (ydlayer);
for (warp_iter = 0; warp_iter < dvals.iter; warp_iter++)
{
gimp_progress_init_printf (_("Flow step %d"), warp_iter+1);
progress = 0;
warp_one (orig_draw, orig_draw,
map_x, map_y, mag_draw, first_time, warp_iter);
gimp_drawable_update (orig_draw->drawable_id,
x1, y1, (x2 - x1), (y2 - y1));
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
first_time = FALSE;
}
image_ID = gimp_item_get_image (map_x->drawable_id);
gimp_drawable_detach (map_x);
gimp_drawable_detach (map_y);
gimp_image_delete (image_ID);
}
/* -------------------------------------------------------------------------- */
static void
warp_one (GimpDrawable *draw,
GimpDrawable *new,
GimpDrawable *map_x,
GimpDrawable *map_y,
GimpDrawable *mag_draw,
gboolean first_time,
gint step)
{
GimpPixelRgn src_rgn;
GimpPixelRgn dest_rgn;
GimpPixelRgn map_x_rgn;
GimpPixelRgn map_y_rgn;
GimpPixelRgn mag_rgn;
GimpTile * tile = NULL;
GimpTile * xtile = NULL;
GimpTile * ytile = NULL;
gint row=-1;
gint xrow=-1;
gint yrow=-1;
gint col=-1;
gint xcol=-1;
gint ycol=-1;
gpointer pr;
gint width = -1;
gint height = -1;
gint dest_bytes=-1;
guchar *destrow, *dest;
guchar *srcrow;
guchar *mxrow=NULL, *mx; /* NULL ptr. to make gcc's -Wall fn. happy */
guchar *myrow=NULL, *my;
guchar *mmagrow=NULL, *mmag=NULL;
guchar pixel[4][4];
gint x1, y1, x2, y2;
gint x, y;
gint max_progress;
gdouble needx, needy;
gdouble xval=0; /* initialize to quiet compiler grumbles */
gdouble yval=0; /* interpolated vector displacement */
gdouble scalefac; /* multiplier for vector displacement scaling */
gdouble dscalefac; /* multiplier for incremental displacement vectors */
gint xi, yi;
gint substep; /* loop variable counting displacement vector substeps */
guchar values[4];
guint32 ivalues[4];
guchar val;
gint k;
gdouble dx, dy; /* X and Y Displacement, integer from GRAY map */
gint mmag_alpha = 0;
gint xm_bytes = 1;
gint ym_bytes = 1;
gint mmag_bytes = 1;
GRand *gr;
gr = g_rand_new (); /* Seed Pseudo Random Number Generator */
/* ================ Outer Loop calculation ================================ */
/* Get selection area */
if (! gimp_drawable_mask_intersect (draw->drawable_id,
&x1, &y1, &width, &height))
return;
x2 = x1 + width;
y2 = y1 + height;
width = draw->width;
height = draw->height;
dest_bytes = draw->bpp;
max_progress = (x2 - x1) * (y2 - y1);
/* --------- Register the (many) pixel regions ---------- */
gimp_pixel_rgn_init (&src_rgn, draw,
x1, y1, (x2 - x1), (y2 - y1), FALSE, FALSE);
/* only push undo-stack the first time through. Thanks Spencer! */
if (first_time)
gimp_pixel_rgn_init (&dest_rgn,
new, x1, y1, (x2 - x1), (y2 - y1), TRUE, TRUE);
else
gimp_pixel_rgn_init (&dest_rgn,
new, x1, y1, (x2 - x1), (y2 - y1), TRUE, TRUE);
gimp_pixel_rgn_init (&map_x_rgn,
map_x, x1, y1, (x2 - x1), (y2 - y1), FALSE, FALSE);
xm_bytes = gimp_drawable_bpp(map_x->drawable_id);
gimp_pixel_rgn_init (&map_y_rgn,
map_y, x1, y1, (x2 - x1), (y2 - y1), FALSE, FALSE);
ym_bytes = gimp_drawable_bpp(map_y->drawable_id);
if (dvals.mag_use)
{
gimp_pixel_rgn_init (&mag_rgn,
mag_draw, x1, y1, (x2 - x1), (y2 - y1), FALSE, FALSE);
if (gimp_drawable_has_alpha(mag_draw->drawable_id))
mmag_alpha = 1;
mmag_bytes = gimp_drawable_bpp(mag_draw->drawable_id);
pr = gimp_pixel_rgns_register (5,
&src_rgn, &dest_rgn,
&map_x_rgn, &map_y_rgn, &mag_rgn);
}
else
{
pr = gimp_pixel_rgns_register (4,
&src_rgn, &dest_rgn,
&map_x_rgn, &map_y_rgn);
}
/* substep displacement vector scale factor */
dscalefac = dvals.amount / (256 * 127.5 * dvals.substeps);
for (pr = pr; pr != NULL; pr = gimp_pixel_rgns_process (pr))
{
srcrow = src_rgn.data;
destrow = dest_rgn.data;
mxrow = map_x_rgn.data;
myrow = map_y_rgn.data;
if (dvals.mag_use)
mmagrow = mag_rgn.data;
/* loop over destination pixels */
for (y = dest_rgn.y; y < (dest_rgn.y + dest_rgn.h); y++)
{
dest = destrow;
mx = mxrow;
my = myrow;
if (dvals.mag_use == TRUE)
mmag = mmagrow;
for (x = dest_rgn.x; x < (dest_rgn.x + dest_rgn.w); x++)
{
/* ----- Find displacement vector (amnt_x, amnt_y) ------------ */
dx = dscalefac * ((256.0 * mx[0]) + mx[1] -32768); /* 16-bit values */
dy = dscalefac * ((256.0 * my[0]) + my[1] -32768);
if (dvals.mag_use)
{
scalefac = warp_map_mag_give_value (mmag,
mmag_alpha,
mmag_bytes) / 255.0;
dx *= scalefac;
dy *= scalefac;
}
if (dvals.dither != 0.0)
{ /* random dither is +/- dvals.dither pixels */
dx += g_rand_double_range (gr, -dvals.dither, dvals.dither);
dy += g_rand_double_range (gr, -dvals.dither, dvals.dither);
}
if (dvals.substeps != 1)
{ /* trace (substeps) iterations of displacement vector */
for (substep = 1; substep < dvals.substeps; substep++)
{
/* In this (substep) loop, (x,y) remain fixed. (dx,dy) vary each step. */
needx = x + dx;
needy = y + dy;
if (needx >= 0.0)
xi = (gint) needx;
else
xi = -((gint) -needx + 1);
if (needy >= 0.0)
yi = (gint) needy;
else
yi = -((gint) -needy + 1);
/* get 4 neighboring DX values from DiffX drawable for linear interpolation */
xtile = warp_pixel (map_x, xtile, width, height, x1, y1, x2, y2, xi, yi, &xrow, &xcol, pixel[0]);
xtile = warp_pixel (map_x, xtile, width, height, x1, y1, x2, y2, xi + 1, yi, &xrow, &xcol, pixel[1]);
xtile = warp_pixel (map_x, xtile, width, height, x1, y1, x2, y2, xi, yi + 1, &xrow, &xcol, pixel[2]);
xtile = warp_pixel (map_x, xtile, width, height, x1, y1, x2, y2, xi + 1, yi + 1, &xrow, &xcol, pixel[3]);
ivalues[0] = 256 * pixel[0][0] + pixel[0][1];
ivalues[1] = 256 * pixel[1][0] + pixel[1][1];
ivalues[2] = 256 * pixel[2][0] + pixel[2][1];
ivalues[3] = 256 * pixel[3][0] + pixel[3][1];
xval = gimp_bilinear_32 (needx, needy, ivalues);
/* get 4 neighboring DY values from DiffY drawable for linear interpolation */
ytile = warp_pixel (map_y, ytile, width, height, x1, y1, x2, y2, xi, yi, &yrow, &ycol, pixel[0]);
ytile = warp_pixel (map_y, ytile, width, height, x1, y1, x2, y2, xi + 1, yi, &yrow, &ycol, pixel[1]);
ytile = warp_pixel (map_y, ytile, width, height, x1, y1, x2, y2, xi, yi + 1, &yrow, &ycol, pixel[2]);
ytile = warp_pixel (map_y, ytile, width, height, x1, y1, x2, y2, xi + 1, yi + 1, &yrow, &ycol, pixel[3]);
ivalues[0] = 256 * pixel[0][0] + pixel[0][1];
ivalues[1] = 256 * pixel[1][0] + pixel[1][1];
ivalues[2] = 256 * pixel[2][0] + pixel[2][1];
ivalues[3] = 256 * pixel[3][0] + pixel[3][1];
yval = gimp_bilinear_32 (needx, needy, ivalues);
/* move displacement vector to this new value */
dx += dscalefac * (xval - 32768);
dy += dscalefac * (yval - 32768);
} /* for (substep) */
} /* if (substeps != 0) */
/* --------------------------------------------------------- */
needx = x + dx;
needy = y + dy;
mx += xm_bytes; /* pointers into x,y displacement maps */
my += ym_bytes;
if (dvals.mag_use == TRUE)
mmag += mmag_bytes;
/* Calculations complete; now copy the proper pixel */
if (needx >= 0.0)
xi = (gint) needx;
else
xi = -((gint) -needx + 1);
if (needy >= 0.0)
yi = (gint) needy;
else
yi = -((gint) -needy + 1);
/* get 4 neighboring pixel values from source drawable for linear interpolation */
tile = warp_pixel (draw, tile, width, height, x1, y1, x2, y2, xi, yi, &row, &col, pixel[0]);
tile = warp_pixel (draw, tile, width, height, x1, y1, x2, y2, xi + 1, yi, &row, &col, pixel[1]);
tile = warp_pixel (draw, tile, width, height, x1, y1, x2, y2, xi, yi + 1, &row, &col, pixel[2]);
tile = warp_pixel (draw, tile, width, height, x1, y1, x2, y2, xi + 1, yi + 1, &row, &col, pixel[3]);
for (k = 0; k < dest_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 k */
} /* for x */
/* srcrow += src_rgn.rowstride; */
srcrow += src_rgn.rowstride;
destrow += dest_rgn.rowstride;
mxrow += map_x_rgn.rowstride;
myrow += map_y_rgn.rowstride;
if (dvals.mag_use == TRUE)
mmagrow += mag_rgn.rowstride;
} /* for y */
progress += (dest_rgn.w * dest_rgn.h);
gimp_progress_update ((double) progress / (double) max_progress);
} /* for pr */
gimp_progress_update (1.0);
if (tile != NULL)
gimp_tile_unref (tile, FALSE);
if (xtile != NULL)
gimp_tile_unref (xtile, FALSE);
if (ytile != NULL)
gimp_tile_unref (ytile, FALSE);
/* update the region */
gimp_drawable_flush (new);
gimp_drawable_merge_shadow (draw->drawable_id, first_time);
g_rand_free (gr);
} /* warp_one */
/* ------------------------------------------------------------------------- */
static gdouble
warp_map_mag_give_value (guchar *pt,
gint alpha,
gint bytes)
{
gdouble ret, val_alpha;
if (bytes >= 3)
ret = (pt[0] + pt[1] + pt[2])/3.0;
else
ret = (gdouble) *pt;
if (alpha)
{
val_alpha = pt[bytes - 1];
ret = (ret * val_alpha / 255.0);
};
return (ret);
}
static GimpTile *
warp_pixel (GimpDrawable *drawable,
GimpTile *tile,
gint width,
gint height,
gint x1,
gint y1,
gint x2,
gint y2,
gint x,
gint y,
gint *row,
gint *col,
guchar *pixel)
{
static guchar empty_pixel[4] = {0, 0, 0, 0};
guchar *data;
gint b;
/* Tile the image. */
if (dvals.wrap_type == WRAP)
{
if (x < 0)
x = width - (-x % width);
else
x %= width;
if (y < 0)
y = height - (-y % height);
else
y %= height;
}
/* Smear out the edges of the image by repeating pixels. */
else if (dvals.wrap_type == SMEAR)
{
if (x < 0)
x = 0;
else if (x > width - 1)
x = width - 1;
if (y < 0)
y = 0;
else if (y > height - 1)
y = height - 1;
}
if (x >= x1 && y >= y1 && x < x2 && y < y2)
{
if ((((guint) (x / tile_width)) != *col) ||
(((guint) (y / tile_height)) != *row))
{
*col = x / tile_width;
*row = y / tile_height;
if (tile)
gimp_tile_unref (tile, FALSE);
tile = gimp_drawable_get_tile (drawable, FALSE, *row, *col);
gimp_tile_ref (tile);
}
data = (tile->data +
tile->bpp * (tile->ewidth * (y % tile_height) + (x % tile_width)));
}
else
{
if (dvals.wrap_type == BLACK)
data = empty_pixel;
else
data = color_pixel; /* must have selected COLOR type */
}
for (b = 0; b < drawable->bpp; b++)
pixel[b] = data[b];
return tile;
}
/* Warp interface functions */
static gboolean
warp_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);
}