/* Warp --- image filter plug-in for The Gimp image manipulation program * 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 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. * * 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 The 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 #include #include #include "libgimp/stdplugins-intl.h" /* Some useful macros */ #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, int x, int y, int w); static void warp_one (GimpDrawable *draw, GimpDrawable *new, GimpDrawable *map_x, GimpDrawable *map_y, GimpDrawable *mag_draw, gint first_time, gint step); static void warp (GimpDrawable *drawable, GimpDrawable **map_x_p, GimpDrawable **map_y_p); static gint 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 gint warp_map_constrain (gint32 image_id, gint32 drawable_id, gpointer data); static void warp_map_callback (gint32 id, gpointer data); static void warp_map_mag_callback (gint32 id, gpointer data); static void warp_map_grad_callback (gint32 id, gpointer data); static void warp_map_vector_callback (gint32 id, gpointer data); static gdouble warp_map_mag_give_value (guchar *pt, gint alpha, gint bytes); /* -------------------------------------------------------------------------- */ /* Variables global over entire plug-in scope */ /* -------------------------------------------------------------------------- */ 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 display_diff_map = TRUE; show 16-bit diff. vectormap */ 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 GimpParamDef args[] = { { GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" }, { 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_warp", "Twist or smear an image. (only first six arguments are required)", "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_("/Filters/Map/_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]; GimpDrawable *drawable; GimpDrawable *map_x = NULL; /* satisfy compiler complaints */ GimpDrawable *map_y = NULL; gint32 image_ID; /* image id of drawable */ GimpRGB color; GimpPDBStatusType status = GIMP_PDB_SUCCESS; gint pcnt; /* parameter counter for scanning input params. */ 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_palette_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_warp", &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 { pcnt = MIN_ARGS; /* parameter counter */ 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_warp", &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, &map_x, &map_y); /* Store data */ if (run_mode == GIMP_RUN_INTERACTIVE) gimp_set_data ("plug_in_warp", &dvals, sizeof (WarpVals)); } values[0].data.d_status = status; image_ID = gimp_drawable_get_image (map_x->drawable_id); gimp_drawable_detach (map_x); gimp_drawable_detach (map_y); gimp_image_delete (image_ID); if (run_mode != GIMP_RUN_NONINTERACTIVE) gimp_displays_flush (); } static int warp_dialog (GimpDrawable *drawable) { GtkWidget *dlg; GtkWidget *vbox; GtkWidget *label; GtkWidget *toggle; GtkWidget *toggle_hbox; GtkWidget *frame; GtkWidget *table; GtkWidget *otable; GtkWidget *spinbutton; GtkObject *adj; GtkWidget *option_menu; GtkWidget *option_menu_mag; GtkWidget *option_menu_grad; GtkWidget *option_menu_vector; GtkWidget *menu; GtkWidget *magmenu; GtkWidget *gradmenu; GtkWidget *vectormenu; GSList *group = NULL; gboolean run; gimp_ui_init ("warp", FALSE); dlg = gimp_dialog_new (_("Warp"), "warp", NULL, 0, gimp_standard_help_func, "plug-in-warp", GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL, GTK_STOCK_OK, GTK_RESPONSE_OK, NULL); vbox = gtk_vbox_new (FALSE, 4); gtk_container_set_border_width (GTK_CONTAINER (vbox), 6); gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), vbox, TRUE, TRUE, 0); gtk_widget_show (vbox); frame = gtk_frame_new (_("Main Options")); gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0); table = gtk_table_new (3, 3, FALSE); gtk_table_set_row_spacings (GTK_TABLE (table), 2); gtk_table_set_col_spacings (GTK_TABLE (table), 4); gtk_container_set_border_width (GTK_CONTAINER (table), 4); gtk_container_add (GTK_CONTAINER (frame), table); /* amount, iter */ spinbutton = gimp_spin_button_new (&adj, dvals.amount, -1000, 1000, /* ??? */ 1, 10, 0, 1, 2); gimp_table_attach_aligned (GTK_TABLE (table), 0, 0, _("Step Size:"), 1.0, 0.5, spinbutton, 1, TRUE); 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); gimp_table_attach_aligned (GTK_TABLE (table), 0, 1, _("Iterations:"), 1.0, 0.5, spinbutton, 1, TRUE); g_signal_connect (adj, "value_changed", G_CALLBACK (gimp_int_adjustment_update), &dvals.iter); /* Displacement map menu */ label = gtk_label_new (_("Displacement Map:")); gtk_table_attach (GTK_TABLE (table), label, 2, 3, 0, 1, GTK_FILL, GTK_FILL, 0, 0); gtk_widget_show (label); option_menu = gtk_option_menu_new (); gtk_table_attach (GTK_TABLE (table), option_menu, 2, 3, 1, 2, GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0); menu = gimp_drawable_menu_new (warp_map_constrain, warp_map_callback, drawable, dvals.warp_map); gtk_option_menu_set_menu (GTK_OPTION_MENU (option_menu), menu); gtk_widget_show (option_menu); /* ======================================================================= */ /* Displacement Type */ label = gtk_label_new (_("On Edges:")); gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5); gtk_table_attach (GTK_TABLE (table), label, 0, 1, 2, 3, GTK_FILL, GTK_FILL, 0, 0); gtk_widget_show (label); toggle_hbox = gtk_hbox_new (FALSE, 4); gtk_table_attach (GTK_TABLE (table), toggle_hbox, 1, 3, 2, 3, GTK_FILL, GTK_FILL, 0, 0); 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, _("FG 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); gtk_widget_show (toggle_hbox); gtk_widget_show (table); gtk_widget_show (frame); /* -------------------------------------------------------------------- */ /* --------- The secondary table -------------------------- */ frame = gtk_frame_new (_("Secondary Options")); gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0); table = gtk_table_new (3, 3, FALSE); gtk_table_set_row_spacings (GTK_TABLE (table), 2); gtk_table_set_col_spacings (GTK_TABLE (table), 4); gtk_container_set_border_width (GTK_CONTAINER (table), 4); gtk_container_add (GTK_CONTAINER (frame), table); spinbutton = gimp_spin_button_new (&adj, dvals.dither, 0, 100, 1, 10, 0, 1, 2); gimp_table_attach_aligned (GTK_TABLE (table), 0, 0, _("Dither Size:"), 1.0, 0.5, spinbutton, 1, TRUE); 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); gimp_table_attach_aligned (GTK_TABLE (table), 0, 1, _("Rotation Angle:"), 1.0, 0.5, spinbutton, 1, TRUE); 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); gimp_table_attach_aligned (GTK_TABLE (table), 0, 2, _("Substeps:"), 1.0, 0.5, spinbutton, 1, TRUE); g_signal_connect (adj, "value_changed", G_CALLBACK (gimp_int_adjustment_update), &dvals.substeps); /* Magnitude map menu */ label = gtk_label_new (_("Magnitude Map:")); gtk_table_attach (GTK_TABLE (table), label, 2, 3, 0, 1, GTK_FILL, GTK_FILL, 0, 0); gtk_widget_show (label); option_menu_mag = gtk_option_menu_new (); gtk_table_attach (GTK_TABLE (table), option_menu_mag, 2, 3, 1, 2, GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0); magmenu = gimp_drawable_menu_new (warp_map_constrain, warp_map_mag_callback, drawable, dvals.mag_map); gtk_option_menu_set_menu (GTK_OPTION_MENU (option_menu_mag), magmenu); gtk_widget_show (option_menu_mag); /* Magnitude Usage */ toggle_hbox = gtk_hbox_new (FALSE, 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); toggle = gtk_check_button_new_with_label (_("Use Mag 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); gtk_widget_show (toggle_hbox); gtk_widget_show (table); gtk_widget_show (frame); /* -------------------------------------------------------------------- */ /* --------- The "other" table -------------------------- */ frame = gtk_frame_new (_("Other Options")); gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0); otable = gtk_table_new (3, 3, FALSE); gtk_table_set_row_spacings (GTK_TABLE (otable), 2); gtk_table_set_col_spacings (GTK_TABLE (otable), 4); gtk_container_set_border_width (GTK_CONTAINER (otable), 4); gtk_container_add (GTK_CONTAINER (frame), otable); spinbutton = gimp_spin_button_new (&adj, dvals.grad_scale, -1000, 1000, /* ??? */ 0.01, 0.1, 0, 1, 3); gimp_table_attach_aligned (GTK_TABLE (otable), 0, 0, _("Gradient Scale:"), 1.0, 0.5, spinbutton, 1, TRUE); g_signal_connect (adj, "value_changed", G_CALLBACK (gimp_double_adjustment_update), &dvals.grad_scale); /* --------- Gradient map menu ---------------- */ option_menu_grad = gtk_option_menu_new (); gtk_table_attach (GTK_TABLE (otable), option_menu_grad, 2, 3, 0, 1, GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0); gradmenu = gimp_drawable_menu_new (warp_map_constrain, warp_map_grad_callback, drawable, dvals.grad_map); gtk_option_menu_set_menu (GTK_OPTION_MENU (option_menu_grad), gradmenu); gimp_help_set_help_data (option_menu_grad, _("Gradient map selection menu"), NULL); gtk_widget_show (option_menu_grad); /* ---------------------------------------------- */ spinbutton = gimp_spin_button_new (&adj, dvals.vector_scale, -1000, 1000, /* ??? */ 0.01, 0.1, 0, 1, 3); gimp_table_attach_aligned (GTK_TABLE (otable), 0, 1, _("Vector Mag:"), 1.0, 0.5, spinbutton, 1, TRUE); 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); gimp_table_attach_aligned (GTK_TABLE (otable), 0, 2, _("Angle:"), 1.0, 0.5, spinbutton, 1, TRUE); g_signal_connect (adj, "value_changed", G_CALLBACK (gimp_double_adjustment_update), &dvals.vector_angle); /* --------- Vector map menu ---------------- */ option_menu_vector = gtk_option_menu_new (); gtk_table_attach (GTK_TABLE (otable), option_menu_vector, 2, 3, 1, 2, GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0); vectormenu = gimp_drawable_menu_new (warp_map_constrain, warp_map_vector_callback, drawable, dvals.vector_map); gtk_option_menu_set_menu (GTK_OPTION_MENU (option_menu_vector), vectormenu); gimp_help_set_help_data (option_menu_vector, _("Fixed-direction-vector map selection menu"), NULL); gtk_widget_show (option_menu_vector); gtk_widget_show (otable); gtk_widget_show (frame); 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 */ /* --------------------------------------- */ gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2); 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 = (guchar *) malloc ((x2 - x1 + 2) * src_bytes); cur_row = (guchar *) malloc ((x2 - x1 + 2) * src_bytes); next_row = (guchar *) malloc ((x2 - x1 + 2) * src_bytes); dest = (guchar *) malloc ((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 % 5) == 0) gimp_progress_update ((double) row / (double) (y2 - y1)); } /* 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)); free (prev_row); /* row buffers allocated at top of fn. */ free (cur_row); free (next_row); 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, int x, int y, int w) { int b; if (y == 0) /* wrap around */ gimp_pixel_rgn_get_row (pixel_rgn, data, x, (pixel_rgn->h - 1), w); else if (y == pixel_rgn->h) gimp_pixel_rgn_get_row (pixel_rgn, data, x, 1, w); else gimp_pixel_rgn_get_row (pixel_rgn, data, x, y, w); /* Fill in edge pixels */ for (b = 0; b < pixel_rgn->bpp; b++) { data[-pixel_rgn->bpp + b] = 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 */ gint has_alpha, ind; /* ----------------------------------------------------------------------- */ 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). */ gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2); /* 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; has_alpha = gimp_drawable_has_alpha (drawable->drawable_id); /* -- 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_drawable_get_image (drawable->drawable_id); layer_active = gimp_image_get_active_layer (image_id); new_image_id = gimp_image_new (width, height, GIMP_RGB); /* create new image for X,Y diff */ 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_add_layer (new_image_id, xlayer_id, 1); gimp_image_add_layer (new_image_id, ylayer_id, 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); if ((desty==NULL) || (destx==NULL) || (cur_row_m==NULL) || (cur_row_v==NULL) || (next_row_g==NULL) || (cur_row_g==NULL) || (prev_row_g==NULL) || (next_row==NULL) || (cur_row==NULL) || (prev_row==NULL)) { g_printerr ("Warp diff: error allocating memory.\n"); exit (EXIT_FAILURE); } /* initialize the source and destination pixel regions */ gimp_pixel_rgn_init (&srcPR, drawable, 0, 0, width, height, FALSE, FALSE); /* 'curl' vector-rotation input */ gimp_pixel_rgn_init (&destxPR, draw_xd, 0, 0, width, height, TRUE, FALSE); /* destination: X diff output */ gimp_pixel_rgn_init (&destyPR, draw_yd, 0, 0, width, height, TRUE, FALSE); /* Y diff output */ 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) { /* fprintf(stderr,"%f %f x,y vector components.\n",scale_vec_x,scale_vec_y); */ vdraw = gimp_drawable_get(dvals.vector_map); vbytes = vdraw->bpp; /* bytes per pixel in SOURCE drawable */ gimp_pixel_rgn_init (&vecPR, vdraw, 0, 0, width, height, FALSE, FALSE); /* fixed-vector scale-map */ 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; gimp_pixel_rgn_init (&gradPR, gdraw, 0, 0, width, height, FALSE, FALSE); /* fixed-vector scale-map */ 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; gimp_pixel_rgn_init (&magPR, mdraw, 0, 0, width, height, FALSE, FALSE); /* fixed-vector scale-map */ crm = cur_row_m + mbytes; diff_prepare_row (&magPR, crm, x1, y1, (x2 - x1)); } dtheta = dvals.angle * G_PI / 180.0; rscalefac = 256.0 / (3*src_bytes); /* note that '3' is rather arbitrary here. */ gscalefac = dvals.grad_scale* 256.0 / (3*gbytes); /* scale factor for gradient map components */ /* 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; ind = 0; 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 % 5) == 0) gimp_progress_update ((double) row / (double) (y2 - y1)); } /* for (row..) */ /* 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)); /* if (display_diff_map) { gimp_display_new(new_image_id); } */ 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 **map_x, GimpDrawable **map_y) { GimpDrawable *disp_map; /* Displacement map, ie, control array */ GimpDrawable *mag_draw; /* Magnitude multiplier factor map */ gchar *string; /* string to hold title of progress bar window */ gint first_time = TRUE; gint width; gint height; gint bytes; gint orig_image_id; gint image_type; gint x1, y1, x2, y2; gint32 xdlayer = -1; gint32 ydlayer = -1; gint warp_iter; /* index var. over all "warp" Displacement iterations */ 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...")); diff (disp_map, &xdlayer, &ydlayer); /* generate x,y differential images (arrays) */ /* Get selection area */ gimp_drawable_mask_bounds (orig_draw->drawable_id, &x1, &y1, &x2, &y2); width = orig_draw->width; height = orig_draw->height; bytes = orig_draw->bpp; image_type = gimp_drawable_type (orig_draw->drawable_id); *map_x = gimp_drawable_get (xdlayer); *map_y = gimp_drawable_get (ydlayer); orig_image_id = gimp_drawable_get_image (orig_draw->drawable_id); /* gimp_image_lower_layer(orig_image_id, new_layer_id); */ /* hide it! */ /* gimp_layer_set_opacity(new_layer_id, 0.0); */ for (warp_iter = 0; warp_iter < dvals.iter; warp_iter++) { string = g_strdup_printf (_("Flow Step %d..."), warp_iter+1); gimp_progress_init (string); g_free (string); progress = 0; gimp_progress_update (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; } /* gimp_image_add_layer (orig_image_id, new_layer_id, 1); */ /* make layer visible in 'layers' dialog */ } /* Warp */ /* -------------------------------------------------------------------------- */ static void warp_one (GimpDrawable *draw, GimpDrawable *new, GimpDrawable *map_x, GimpDrawable *map_y, GimpDrawable *mag_draw, gint 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; gint dmap_bytes=-1; guchar *destrow, *dest; guchar *srcrow, *src; 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 xm_alpha = 0; gint ym_alpha = 0; 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 */ gimp_drawable_mask_bounds (draw->drawable_id, &x1, &y1, &x2, &y2); width = draw->width; height = draw->height; dest_bytes = draw->bpp; dmap_bytes = map_x->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==TRUE) 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, FALSE); */ 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); if (gimp_drawable_has_alpha(map_x->drawable_id)) xm_alpha = 1; 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); if (gimp_drawable_has_alpha(map_y->drawable_id)) ym_alpha = 1; ym_bytes = gimp_drawable_bpp(map_y->drawable_id); if (dvals.mag_use == TRUE) { 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); } dscalefac = (dvals.amount) / (256* 127.5 * dvals.substeps); /* substep displacement vector scale factor */ 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 == TRUE) mmagrow = mag_rgn.data; /* loop over destination pixels */ for (y = dest_rgn.y; y < (dest_rgn.y + dest_rgn.h); y++) { src = srcrow; 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 == TRUE) { 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++) { needx = x + dx; /* In this (substep) loop, (x,y) remain fixed. (dx,dy) vary each step. */ needy = y + dy; if (needx >= 0.0) xi = (int) needx; else xi = -((int) -needx + 1); if (needy >= 0.0) yi = (int) needy; else yi = -((int) -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); dx += dscalefac * (xval-32768); /* move displacement vector to this new value */ 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 = (int) needx; else xi = -((int) -needx + 1); if (needy >= 0.0) yi = (int) needy; else yi = -((int) -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 */ 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 == TRUE)); 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 gint warp_map_constrain (gint32 image_id, gint32 drawable_id, gpointer data) { GimpDrawable *drawable; drawable = (GimpDrawable *) data; if (drawable_id == -1) return TRUE; return (gimp_drawable_width (drawable_id) == drawable->width && gimp_drawable_height (drawable_id) == drawable->height); } static void warp_map_callback (gint32 id, gpointer data) { dvals.warp_map = id; } static void warp_map_mag_callback (gint32 id, gpointer data) { dvals.mag_map = id; } static void warp_map_grad_callback (gint32 id, gpointer data) { dvals.grad_map = id; } static void warp_map_vector_callback (gint32 id, gpointer data) { dvals.vector_map = id; }