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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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* Compile with (on Linux):
* gcc -I/usr/local/include -I/usr/local/include/glib -o apply_lens apply_lens.c -L/usr/local/lib -L/usr/X11/lib -lgtk -lgdk -lgimp -lglib -lXext -lX11 -lm
*
*/
/* 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 <stdlib.h>
#include <math.h>
#include "libgimp/gimp.h"
#include "gtk/gtk.h"
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif /* M_PI */
#define ENTRY_WIDTH 100
/* Declare local functions.
*/
static void query(void);
static void run(char *name, int nparams,
GParam *param,
int *nreturn_vals,
GParam **return_vals);
static void drawlens(GDrawable *drawable);
static gint lens_dialog(GDrawable *drawable);
GPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
typedef struct
{
gdouble refraction;
gint keep_surr, use_bkgr, 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 GParamDef args[] =
{
{ PARAM_INT32, "run_mode", "Interactive, non-interactive" },
{ PARAM_IMAGE, "image", "Input image (unused)" },
{ PARAM_DRAWABLE, "drawable", "Input drawable" },
{ PARAM_FLOAT, "refraction", "Lens refraction index" },
{ PARAM_INT32, "keep_surroundings", "Keep lens surroundings" },
{ PARAM_INT32, "set_background", "Set lens surroundings to bkgr value" },
{ PARAM_INT32, "set_transparent", "Set lens surroundings transparent" },
};
static GParamDef *return_vals = NULL;
static int nargs = sizeof(args)/ sizeof(args[0]);
static int nreturn_vals = 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",
"<Image>/Filters/Glass Effects/Apply Lens",
"RGB*, GRAY*, INDEXED*",
PROC_PLUG_IN,
nargs, nreturn_vals,
args, return_vals);
}
static void
run(char *name,
int nparams,
GParam *param,
int *nreturn_vals,
GParam **return_vals)
{
static GParam values[1];
GDrawable *drawable;
GRunModeType run_mode;
GStatusType status = STATUS_SUCCESS;
run_mode = param[0].data.d_int32;
values[0].type = PARAM_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 RUN_INTERACTIVE:
gimp_get_data("plug_in_applylens", &lvals);
if(!lens_dialog(drawable)) return;
break;
case RUN_NONINTERACTIVE:
if(nparams != 7) status = STATUS_CALLING_ERROR;
if(status == STATUS_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 == STATUS_SUCCESS && (lvals.refraction < 1.0))
status = STATUS_CALLING_ERROR;
break;
case 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 != RUN_NONINTERACTIVE)
gimp_displays_flush();
if(run_mode == 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, 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 = M_PI/2 - nxangle;
theta2 = asin(sin(theta1)*ri1/ri2);
theta2 = M_PI/2 - nxangle - theta2;
*projx = x - tan(theta2)*n[2];
nyangle = acos(n[1]/sqrt(n[1]*n[1]+n[2]*n[2]));
theta1 = M_PI/2 - nyangle;
theta2 = asin(sin(theta1)*ri1/ri2);
theta2 = M_PI/2 - nyangle - theta2;
*projy = y - tan(theta2)*n[2];
}
static void
drawlens(GDrawable *drawable)
{
GPixelRgn 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;
guchar bgr_red, bgr_blue, bgr_green, alphaval;
GDrawableType drawtype = gimp_drawable_type(drawable->id);
gimp_palette_get_background(&bgr_red, &bgr_green, &bgr_blue);
gimp_drawable_mask_bounds(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 INDEXEDA_IMAGE:
dest[pixelpos+1] = alphaval;
case INDEXED_IMAGE:
dest[pixelpos+0] = 0;
break;
case RGBA_IMAGE:
dest[pixelpos+3] = alphaval;
case RGB_IMAGE:
dest[pixelpos+0] = bgr_red;
dest[pixelpos+1] = bgr_green;
dest[pixelpos+2] = bgr_blue;
break;
case GRAYA_IMAGE:
dest[pixelpos+1] = alphaval;
case 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->id, TRUE);
gimp_drawable_update(drawable->id, x1, y1,(x2 - x1),(y2 - y1));
}
static void
lens_close_callback(GtkWidget *widget,
gpointer data)
{
gtk_main_quit();
}
static void
lens_ok_callback(GtkWidget *widget,
gpointer data)
{
bint.run = TRUE;
gtk_widget_destroy(GTK_WIDGET (data));
}
static void
lens_toggle_update(GtkWidget *widget,
gpointer data)
{
int *toggle_val;
toggle_val = (int *)data;
if(GTK_TOGGLE_BUTTON (widget)->active)
*toggle_val = TRUE;
else
*toggle_val = FALSE;
}
static void
lens_entry_callback(GtkWidget *widget,
gpointer data)
{
lvals.refraction = atof(gtk_entry_get_text(GTK_ENTRY(widget)));
if(lvals.refraction < 1.0) lvals.refraction = 1.0;
}
static gint
lens_dialog(GDrawable *drawable)
{
GtkWidget *dlg;
GtkWidget *label;
GtkWidget *entry;
GtkWidget *button;
GtkWidget *toggle;
GtkWidget *frame;
GtkWidget *vbox;
GtkWidget *hbox;
gchar buffer[12];
gchar **argv;
gint argc;
GSList *group = NULL;
GDrawableType drawtype;
drawtype = gimp_drawable_type(drawable->id);
argc = 1;
argv = g_new(gchar *, 1);
argv[0] = g_strdup("apply_lens");
gtk_init(&argc, &argv);
gtk_rc_parse(gimp_gtkrc());
dlg = gtk_dialog_new();
gtk_window_set_title(GTK_WINDOW(dlg), "Lens effect");
gtk_window_position(GTK_WINDOW(dlg), GTK_WIN_POS_MOUSE);
gtk_signal_connect(GTK_OBJECT(dlg), "destroy",
(GtkSignalFunc)lens_close_callback,
NULL);
button = gtk_button_new_with_label("OK");
GTK_WIDGET_SET_FLAGS(button, GTK_CAN_DEFAULT);
gtk_signal_connect(GTK_OBJECT(button), "clicked",
(GtkSignalFunc)lens_ok_callback,
dlg);
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dlg)->action_area),
button, TRUE, TRUE, 0);
gtk_widget_grab_default(button);
gtk_widget_show(button);
button = gtk_button_new_with_label("Cancel");
GTK_WIDGET_SET_FLAGS(button, GTK_CAN_DEFAULT);
gtk_signal_connect_object(GTK_OBJECT(button), "clicked",
(GtkSignalFunc)gtk_widget_destroy,
GTK_OBJECT(dlg));
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dlg)->action_area),
button, TRUE, TRUE, 0);
gtk_widget_show(button);
frame = gtk_frame_new("Parameter Settings");
gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_ETCHED_IN);
gtk_container_border_width(GTK_CONTAINER(frame), 10);
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dlg)->vbox), frame, TRUE, TRUE, 0);
vbox = gtk_vbox_new(FALSE, 5);
gtk_container_border_width(GTK_CONTAINER(vbox), 10);
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",
(GtkSignalFunc) lens_toggle_update,
&lvals.keep_surr);
gtk_toggle_button_set_state(GTK_TOGGLE_BUTTON(toggle), lvals.keep_surr);
gtk_widget_show(toggle);
toggle =
gtk_radio_button_new_with_label(group,
drawtype == INDEXEDA_IMAGE ||
drawtype == 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",
(GtkSignalFunc) lens_toggle_update,
&lvals.use_bkgr);
gtk_toggle_button_set_state(GTK_TOGGLE_BUTTON(toggle), lvals.use_bkgr);
gtk_widget_show(toggle);
if((drawtype == INDEXEDA_IMAGE) ||
(drawtype == GRAYA_IMAGE) ||
(drawtype == 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",
(GtkSignalFunc) lens_toggle_update,
&lvals.set_transparent);
gtk_toggle_button_set_state(GTK_TOGGLE_BUTTON(toggle),
lvals.set_transparent);
gtk_widget_show(toggle);
}
hbox = gtk_hbox_new(FALSE, 5);
gtk_box_pack_start(GTK_BOX(vbox), hbox, TRUE, TRUE, 0);
label = gtk_label_new("Lens refraction index: ");
gtk_box_pack_start(GTK_BOX(hbox), label, TRUE, FALSE, 0);
gtk_widget_show(label);
entry = gtk_entry_new();
gtk_box_pack_start(GTK_BOX(hbox), entry, TRUE, TRUE, 0);
gtk_widget_set_usize(entry, ENTRY_WIDTH, 0);
sprintf(buffer, "%.2f", lvals.refraction);
gtk_entry_set_text(GTK_ENTRY(entry), buffer);
gtk_signal_connect(GTK_OBJECT(entry), "changed",
(GtkSignalFunc)lens_entry_callback,
NULL);
gtk_widget_show(entry);
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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