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gimp/plug-ins/common/apply_lens.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* Apply lens plug-in --- makes your selected part of the image look like it
* is viewed under a solid lens.
* Copyright (C) 1997 Morten Eriksen
* mortene@pvv.ntnu.no
* (If you do anything cool with this plug-in, or have ideas for
* improvements (which aren't on my ToDo-list) - send me an email).
*
* 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.
*/
/* Version 0.1:
*
* First release. No known serious bugs, and basically does what you want.
* All fancy features postponed until the next release, though. :)
*
*/
/*
TO DO:
- antialiasing
- preview image
- adjustable (R, G, B and A) filter
- optimize for speed!
- refraction index warning dialog box when value < 1.0
- use "true" lens with specified thickness
- option to apply inverted lens
- adjustable "c" value in the ellipsoid formula
- radiobuttons for "ellipsoid" or "only horiz" and "only vert" (like in the
Ad*b* Ph*t*sh*p Spherify plug-in..)
- clean up source code
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define ENTRY_WIDTH 100
/* Declare local functions.
*/
static void query (void);
static void run (gchar *name,
gint nparams,
GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void drawlens (GimpDrawable *drawable);
static gint lens_dialog (GimpDrawable *drawable);
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
typedef struct
{
gdouble refraction;
gint keep_surr;
gint use_bkgr;
gint set_transparent;
} LensValues;
static LensValues lvals =
{
/* Lens refraction value */
1.7,
/* Surroundings options */
TRUE, FALSE, FALSE
};
typedef struct
{
gint run;
} LensInterface;
static LensInterface bint =
{
FALSE /* run */
};
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, "refraction", "Lens refraction index" },
{ GIMP_PDB_INT32, "keep_surroundings", "Keep lens surroundings" },
{ GIMP_PDB_INT32, "set_background", "Set lens surroundings to bkgr value" },
{ GIMP_PDB_INT32, "set_transparent", "Set lens surroundings transparent" }
};
static gint nargs = sizeof (args)/ sizeof (args[0]);
gimp_install_procedure ("plug_in_applylens",
"Apply a lens effect",
"This plug-in uses Snell's law to draw an ellipsoid lens over the image",
"Morten Eriksen",
"Morten Eriksen",
"1997",
N_("<Image>/Filters/Glass Effects/Apply Lens..."),
"RGB*, GRAY*, INDEXED*",
GIMP_PLUGIN,
nargs, 0,
args, NULL);
}
static void
run (gchar *name,
gint nparams,
GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpDrawable *drawable;
GimpRunModeType run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
INIT_I18N_UI();
run_mode = param[0].data.d_int32;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
*nreturn_vals = 1;
*return_vals = values;
drawable = gimp_drawable_get (param[2].data.d_drawable);
switch(run_mode)
{
case GIMP_RUN_INTERACTIVE:
gimp_get_data ("plug_in_applylens", &lvals);
if(!lens_dialog (drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
if (nparams != 7)
status = GIMP_PDB_CALLING_ERROR;
if (status == GIMP_PDB_SUCCESS)
{
lvals.refraction = param[3].data.d_float;
lvals.keep_surr = param[4].data.d_int32;
lvals.use_bkgr = param[5].data.d_int32;
lvals.set_transparent = param[6].data.d_int32;
}
if (status == GIMP_PDB_SUCCESS && (lvals.refraction < 1.0))
status = GIMP_PDB_CALLING_ERROR;
break;
case GIMP_RUN_WITH_LAST_VALS:
gimp_get_data ("plug_in_applylens", &lvals);
break;
default:
break;
}
gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));
gimp_progress_init (_("Applying lens..."));
drawlens (drawable);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data ("plug_in_applylens", &lvals, sizeof (LensValues));
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
/*
Ellipsoid formula: x^2/a^2 + y^2/b^2 + z^2/c^2 = 1
*/
static void
find_projected_pos (gfloat a,
gfloat b,
gfloat x,
gfloat y,
gfloat *projx,
gfloat *projy)
{
gfloat c;
gfloat n[3];
gfloat nxangle, nyangle, theta1, theta2;
gfloat ri1 = 1.0;
gfloat ri2 = lvals.refraction;
/* PARAM */
c = MIN (a, b);
n[0] = x;
n[1] = y;
n[2] = sqrt ((1 - x * x / (a * a) - y * y / (b * b)) * (c * c));
nxangle = acos (n[0] / sqrt(n[0] * n[0] + n[2] * n[2]));
theta1 = G_PI / 2 - nxangle;
theta2 = asin (sin (theta1) * ri1 / ri2);
theta2 = G_PI / 2 - nxangle - theta2;
*projx = x - tan (theta2) * n[2];
nyangle = acos (n[1]/sqrt (n[1] * n[1] + n[2] * n[2]));
theta1 = G_PI / 2 - nyangle;
theta2 = asin (sin (theta1) * ri1 / ri2);
theta2 = G_PI / 2 - nyangle - theta2;
*projy = y - tan (theta2) * n[2];
}
static void
drawlens (GimpDrawable *drawable)
{
GimpImageType drawtype = gimp_drawable_type (drawable->drawable_id);
GimpPixelRgn srcPR, destPR;
gint width, height;
gint bytes;
gint row;
gint x1, y1, x2, y2;
guchar *src, *dest;
gint i, col;
gfloat regionwidth, regionheight, dx, dy, xsqr, ysqr;
gfloat a, b, asqr, bsqr, x, y;
glong pixelpos, pos;
GimpRGB background;
guchar bgr_red, bgr_blue, bgr_green;
guchar alphaval;
gimp_palette_get_background (&background);
gimp_rgb_get_uchar (&background,
&bgr_red, &bgr_green, &bgr_blue);
gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
regionwidth = x2 - x1;
a = regionwidth / 2;
regionheight = y2 - y1;
b = regionheight / 2;
asqr = a * a;
bsqr = b * b;
width = drawable->width;
height = drawable->height;
bytes = drawable->bpp;
gimp_pixel_rgn_init (&srcPR, drawable, 0, 0, width, height, FALSE, FALSE);
gimp_pixel_rgn_init (&destPR, drawable, 0, 0, width, height, TRUE, TRUE);
src = g_malloc ((x2 - x1) * (y2 - y1) * bytes);
dest = g_malloc ((x2 - x1) * (y2 - y1) * bytes);
gimp_pixel_rgn_get_rect (&srcPR, src, x1, y1, regionwidth, regionheight);
for (col = 0; col < regionwidth; col++)
{
dx = (gfloat) col - a + 0.5;
xsqr = dx * dx;
for (row = 0; row < regionheight; row++)
{
pixelpos = (col + row * regionwidth) * bytes;
dy = -((gfloat) row - b) - 0.5;
ysqr = dy * dy;
if (ysqr < (bsqr - (bsqr * xsqr) / asqr))
{
find_projected_pos (a, b, dx, dy, &x, &y);
y = -y;
pos = ((gint) (y + b) * regionwidth + (gint) (x + a)) * bytes;
for (i = 0; i < bytes; i++)
{
dest[pixelpos + i] = src[pos + i];
}
}
else
{
if (lvals.keep_surr)
{
for (i = 0; i < bytes; i++)
{
dest[pixelpos + i] = src[pixelpos + i];
}
}
else
{
if (lvals.set_transparent)
alphaval = 0;
else
alphaval = 255;
switch (drawtype)
{
case GIMP_INDEXEDA_IMAGE:
dest[pixelpos + 1] = alphaval;
case GIMP_INDEXED_IMAGE:
dest[pixelpos + 0] = 0;
break;
case GIMP_RGBA_IMAGE:
dest[pixelpos + 3] = alphaval;
case GIMP_RGB_IMAGE:
dest[pixelpos + 0] = bgr_red;
dest[pixelpos + 1] = bgr_green;
dest[pixelpos + 2] = bgr_blue;
break;
case GIMP_GRAYA_IMAGE:
dest[pixelpos + 1] = alphaval;
case GIMP_GRAY_IMAGE:
dest[pixelpos+0] = bgr_red;
break;
}
}
}
}
if (((gint) (regionwidth-col) % 5) == 0)
gimp_progress_update ((gdouble) col / (gdouble) regionwidth);
}
gimp_pixel_rgn_set_rect (&destPR, dest, x1, y1, regionwidth, regionheight);
g_free (src);
g_free (dest);
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, (x2 - x1), (y2 - y1));
}
static void
lens_ok_callback (GtkWidget *widget,
gpointer data)
{
bint.run = TRUE;
gtk_widget_destroy (GTK_WIDGET (data));
}
static gint
lens_dialog (GimpDrawable *drawable)
{
GtkWidget *dlg;
GtkWidget *label;
GtkWidget *toggle;
GtkWidget *frame;
GtkWidget *vbox;
GtkWidget *sep;
GtkWidget *hbox;
GtkWidget *spinbutton;
GtkObject *adj;
GSList *group = NULL;
GimpImageType drawtype;
drawtype = gimp_drawable_type (drawable->drawable_id);
gimp_ui_init ("apply_lens", FALSE);
dlg = gimp_dialog_new (_("Lens Effect"), "apply_lens",
gimp_standard_help_func, "filters/apply_lens.html",
GTK_WIN_POS_MOUSE,
FALSE, TRUE, FALSE,
GTK_STOCK_OK, lens_ok_callback,
NULL, NULL, NULL, TRUE, FALSE,
GTK_STOCK_CANCEL, gtk_widget_destroy,
NULL, 1, NULL, FALSE, TRUE,
NULL);
gtk_signal_connect (GTK_OBJECT (dlg), "destroy",
GTK_SIGNAL_FUNC (gtk_main_quit),
NULL);
frame = gtk_frame_new (_("Parameter Settings"));
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_container_set_border_width (GTK_CONTAINER (frame), 6);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), frame, TRUE, TRUE, 0);
vbox = gtk_vbox_new (FALSE, 2);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 4);
gtk_container_add (GTK_CONTAINER (frame), vbox);
toggle = gtk_radio_button_new_with_label (group,
_("Keep Original Surroundings"));
group = gtk_radio_button_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
GTK_SIGNAL_FUNC (gimp_toggle_button_update),
&lvals.keep_surr);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), lvals.keep_surr);
gtk_widget_show (toggle);
toggle =
gtk_radio_button_new_with_label (group,
drawtype == GIMP_INDEXEDA_IMAGE ||
drawtype == GIMP_INDEXED_IMAGE ?
_("Set Surroundings to Index 0") :
_("Set Surroundings to Background Color"));
group = gtk_radio_button_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start(GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
GTK_SIGNAL_FUNC (gimp_toggle_button_update),
&lvals.use_bkgr);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), lvals.use_bkgr);
gtk_widget_show (toggle);
if ((drawtype == GIMP_INDEXEDA_IMAGE) ||
(drawtype == GIMP_GRAYA_IMAGE) ||
(drawtype == GIMP_RGBA_IMAGE))
{
toggle =
gtk_radio_button_new_with_label (group,
_("Make Surroundings Transparent"));
group = gtk_radio_button_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
GTK_SIGNAL_FUNC (gimp_toggle_button_update),
&lvals.set_transparent);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
lvals.set_transparent);
gtk_widget_show (toggle);
}
sep = gtk_hseparator_new ();
gtk_box_pack_start (GTK_BOX (vbox), sep, FALSE, FALSE, 2);
gtk_widget_show (sep);
hbox = gtk_hbox_new (FALSE, 4);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
label = gtk_label_new (_("Lens Refraction Index:"));
gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
spinbutton = gimp_spin_button_new (&adj, lvals.refraction,
1.0, 100.0, 0.1, 1.0, 0, 1, 2);
gtk_box_pack_start (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
&lvals.refraction);
gtk_widget_show (spinbutton);
gtk_widget_show (hbox);
gtk_widget_show (vbox);
gtk_widget_show (frame);
gtk_widget_show (dlg);
gtk_main ();
gdk_flush ();
return bint.run;
}
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