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gimp/plug-ins/common/tile-glass.c

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/*
* This is the Glass Tile plug-in for GIMP 1.2
* Version 1.02
*
* Copyright (C) 1997 Karl-Johan Andersson (t96kja@student.tdb.uu.se)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
/*
* This filter divide the image into square "glass"-blocks in which
* the image is refracted.
*
* The alpha-channel is left unchanged.
*
* Please send any comments or suggestions to
* Karl-Johan Andersson (t96kja@student.tdb.uu.se)
*
* May 2000 - tim copperfield [timecop@japan.co.jp]
* Added preview mode.
* Noticed there is an issue with the algorithm if odd number of rows or
* columns is requested. Dunno why. I am not a graphics expert :(
*
* May 2000 alt@gimp.org Made preview work and removed some boundary
* conditions that caused "streaks" to appear when using some tile spaces.
*/
#include "config.h"
#include <string.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_PROC "plug-in-glasstile"
#define PLUG_IN_BINARY "tile-glass"
/* --- Typedefs --- */
typedef struct
{
gint xblock;
gint yblock;
/* interface only */
gint constrain;
} GlassValues;
typedef struct
{
GlassValues *gval;
GtkObject *xadj;
GtkObject *yadj;
} GlassChainedValues;
/* --- Declare local functions --- */
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static gboolean glasstile_dialog (GimpDrawable *drawable);
static void glasstile_size_changed (GtkObject *adj,
gpointer data);
static void glasstile_chain_toggled (GtkWidget *widget,
gboolean *value);
static void glasstile (GimpDrawable *drawable,
GimpPreview *preview);
/* --- Variables --- */
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static GlassValues gtvals =
{
20, /* tile width */
20, /* tile height */
/* interface only */
TRUE /* constrained */
};
/* --- Functions --- */
MAIN ()
static void
query (void)
{
static const 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_INT32, "tilex", "Tile width (10 - 50)" },
{ GIMP_PDB_INT32, "tiley", "Tile height (10 - 50)" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Simulate distortion caused by square glass tiles"),
"Divide the image into square glassblocks in "
"which the image is refracted.",
"Karl-Johan Andersson", /* Author */
"Karl-Johan Andersson", /* Copyright */
"May 2000",
N_("_Glass Tile..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_PROC,
"<Image>/Filters/Light and Shadow/Glass");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
GimpDrawable *drawable;
run_mode = param[0].data.d_int32;
INIT_I18N ();
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
/* Get the specified drawable */
drawable = gimp_drawable_get (param[2].data.d_drawable);
gimp_tile_cache_ntiles (2 * (drawable->ntile_cols));
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &gtvals);
/* First acquire information with a dialog */
if (! glasstile_dialog (drawable))
{
gimp_drawable_detach (drawable);
return;
}
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 5)
status = GIMP_PDB_CALLING_ERROR;
if (status == GIMP_PDB_SUCCESS)
{
gtvals.xblock = (gint) param[3].data.d_int32;
gtvals.yblock = (gint) param[4].data.d_int32;
}
if (gtvals.xblock < 10 || gtvals.xblock > 50)
status = GIMP_PDB_CALLING_ERROR;
if (gtvals.yblock < 10 || gtvals.yblock > 50)
status = GIMP_PDB_CALLING_ERROR;
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &gtvals);
break;
default:
break;
}
if (status == GIMP_PDB_SUCCESS)
{
/* Make sure that the drawable is gray or RGB color */
if (gimp_drawable_is_rgb (drawable->drawable_id) ||
gimp_drawable_is_gray (drawable->drawable_id))
{
gimp_progress_init (_("Glass Tile"));
glasstile (drawable, NULL);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE)
{
gimp_set_data (PLUG_IN_PROC, &gtvals, sizeof (GlassValues));
}
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
}
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static gboolean
glasstile_dialog (GimpDrawable *drawable)
{
GlassChainedValues *gv;
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *table;
GtkWidget *chainbutton;
gboolean run;
gv = g_new (GlassChainedValues, 1);
gv->gval = &gtvals;
gtvals.constrain = TRUE;
gimp_ui_init (PLUG_IN_BINARY, TRUE);
dialog = gimp_dialog_new (_("Glass Tile"), PLUG_IN_BINARY,
NULL, 0,
gimp_standard_help_func, PLUG_IN_PROC,
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
gtk_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
gimp_window_set_transient (GTK_WINDOW (dialog));
main_vbox = gtk_vbox_new (FALSE, 12);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);
gtk_container_add (GTK_CONTAINER (GTK_DIALOG (dialog)->vbox), main_vbox);
gtk_widget_show (main_vbox);
preview = gimp_drawable_preview_new (drawable, NULL);
gtk_box_pack_start (GTK_BOX (main_vbox), preview, TRUE, TRUE, 0);
gtk_widget_show (preview);
g_signal_connect_swapped (preview, "invalidated",
G_CALLBACK (glasstile),
drawable);
/* Parameter settings */
table = gtk_table_new (2, 4, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_table_set_row_spacings (GTK_TABLE (table), 6);
gtk_table_set_col_spacing (GTK_TABLE (table), 2, 2);
gtk_box_pack_start (GTK_BOX (main_vbox), table, FALSE, FALSE, 0);
gtk_widget_show (table);
/* Horizontal scale - Width */
gv->xadj = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("Tile _width:"), 150, 0,
gtvals.xblock, 10, 50, 2, 10, 0,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (gv->xadj, "value-changed",
G_CALLBACK (glasstile_size_changed),
gv);
g_signal_connect_swapped (gv->xadj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
/* Horizontal scale - Height */
gv->yadj = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("Tile _height:"), 150, 0,
gtvals.yblock, 10, 50, 2, 10, 0,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (gv->yadj, "value-changed",
G_CALLBACK (glasstile_size_changed),
gv);
g_signal_connect_swapped (gv->yadj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
chainbutton = gimp_chain_button_new (GIMP_CHAIN_RIGHT);
gimp_chain_button_set_active (GIMP_CHAIN_BUTTON (chainbutton),
gtvals.constrain);
gtk_table_attach_defaults (GTK_TABLE(table), chainbutton, 3, 4, 0, 2);
g_signal_connect (chainbutton, "toggled",
G_CALLBACK (glasstile_chain_toggled),
&gtvals.constrain);
gtk_widget_show (chainbutton);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
static void
glasstile_size_changed (GtkObject *adj,
gpointer data)
{
GlassChainedValues *gv = data;
if (adj == gv->xadj)
{
gimp_int_adjustment_update(GTK_ADJUSTMENT (gv->xadj), &gv->gval->xblock);
if (gv->gval->constrain)
gtk_adjustment_set_value(GTK_ADJUSTMENT (gv->yadj),
(gdouble) gv->gval->xblock);
}
else if (adj == gv->yadj)
{
gimp_int_adjustment_update(GTK_ADJUSTMENT (gv->yadj), &gv->gval->yblock);
if (gv->gval->constrain)
gtk_adjustment_set_value(GTK_ADJUSTMENT (gv->xadj),
(gdouble) gv->gval->yblock);
}
}
static void
glasstile_chain_toggled (GtkWidget *widget,
gboolean *value)
{
*value = gimp_chain_button_get_active (GIMP_CHAIN_BUTTON (widget));
}
/* - Filter function - I wish all filter functions had a pmode :) */
static void
glasstile (GimpDrawable *drawable,
GimpPreview *preview)
{
GimpPixelRgn srcPR, destPR;
gint width, height;
gint bytes;
guchar *dest, *d;
guchar *cur_row;
gint row, col, i;
gint x1, y1, x2, y2;
/* Translations of variable names from Maswan
* rutbredd = grid width
* ruthojd = grid height
* ymitt = y middle
* xmitt = x middle
*/
gint rutbredd, xpixel1, xpixel2;
gint ruthojd , ypixel2;
gint xhalv, xoffs, xmitt, xplus;
gint yhalv, yoffs, ymitt, yplus;
if (preview)
{
gimp_preview_get_position (preview, &x1, &y1);
gimp_preview_get_size (preview, &width, &height);
x2 = x1 + width;
y2 = y1 + height;
}
else
{
gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
width = x2 - x1;
height = y2 - y1;
}
bytes = drawable->bpp;
cur_row = g_new (guchar, width * bytes);
dest = g_new (guchar, width * bytes);
/* initialize the pixel regions, set grid height/width */
gimp_pixel_rgn_init (&srcPR, drawable,
x1, y1, width, height,
FALSE, FALSE);
gimp_pixel_rgn_init (&destPR, drawable,
x1, y1, width, height,
preview == NULL, TRUE);
rutbredd = gtvals.xblock;
ruthojd = gtvals.yblock;
xhalv = rutbredd / 2;
yhalv = ruthojd / 2;
xplus = rutbredd % 2;
yplus = ruthojd % 2;
ymitt = y1;
yoffs = 0;
/* Loop through the rows */
for (row = y1; row < y2; row++)
{
d = dest;
ypixel2 = ymitt + yoffs * 2;
ypixel2 = CLAMP (ypixel2, 0, y2 - 1);
gimp_pixel_rgn_get_row (&srcPR, cur_row, x1, ypixel2, width);
yoffs++;
/* if current offset = half, do a displacement next time around */
if (yoffs == yhalv)
{
ymitt += ruthojd;
yoffs = - (yhalv + yplus);
}
xmitt = 0;
xoffs = 0;
for (col = 0; col < x2 - x1; col++) /* one pixel */
{
xpixel1 = (xmitt + xoffs) * bytes;
xpixel2 = (xmitt + xoffs * 2) * bytes;
if (xpixel2 < (x2 - x1) * bytes)
{
if (xpixel2 < 0)
xpixel2 = 0;
for (i = 0; i < bytes; i++)
d[xpixel1 + i] = cur_row[xpixel2 + i];
}
else
{
for (i = 0; i < bytes; i++)
d[xpixel1 + i] = cur_row[xpixel1 + i];
}
xoffs++;
if (xoffs == xhalv)
{
xmitt += rutbredd;
xoffs = - (xhalv + xplus);
}
}
/* Store the dest */
gimp_pixel_rgn_set_row (&destPR, dest, x1, row, width);
if (!preview && ((row % 5) == 0))
{
gimp_progress_update ((gdouble) row / (gdouble) height);
}
}
/* Update region */
if (preview)
{
gimp_drawable_preview_draw_region (GIMP_DRAWABLE_PREVIEW (preview),
&destPR);
}
else
{
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id,
x1, y1, width, height);
}
g_free (cur_row);
g_free (dest);
}
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