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gimp/plug-ins/common/waves.c

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/**************************************************
* file: waves/waves.c
*
* Copyright (c) 1997 Eric L. Hernes (erich@rrnet.com)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software withough specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id$
*/
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include <libgimp/gimp.h>
#include <gtk/gtk.h>
#include <plug-ins/megawidget/megawidget.h>
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif /* M_PI */
struct Grgb {
guint8 red;
guint8 green;
guint8 blue;
};
struct GRegion {
gint32 x;
gint32 y;
gint32 width;
gint32 height;
};
struct piArgs {
gdouble amplitude;
gdouble phase;
gdouble wavelength;
gint32 type;
gint32 reflective;
};
struct mwPreview *mwp;
static void query(void);
static void run(char *name, int nparam, GParam *param,
int *nretvals, GParam **retvals);
int pluginCore(struct piArgs *argp, gint32 drawable);
int pluginCoreIA(struct piArgs *argp, gint32 drawable);
static mw_preview_t waves_do_preview;
static void wave(guchar *src, guchar *dest, gint width, gint height, gint bypp,
gdouble amplitude, gdouble wavelength, gdouble phase,
gint smear, gint reflective, gint verbose);
static guchar bilinear(gdouble x, gdouble y, guchar *v);
#define WITHIN(a, b, c) ((((a) <= (b)) && ((b) <= (c))) ? 1 : 0)
GPlugInInfo PLUG_IN_INFO = {
NULL, /* init */
NULL, /* quit */
query, /* query */
run, /* run */
};
MAIN()
static void
query(void){
static GParamDef args[] = {
{ PARAM_INT32, "run_mode", "Interactive, non-interactive" },
{ PARAM_IMAGE, "image", "The Image" },
{ PARAM_DRAWABLE, "drawable", "The Drawable" },
{ PARAM_FLOAT, "amplitude", "The Amplitude of the Waves" },
{ PARAM_FLOAT, "phase", "The Phase of the Waves" },
{ PARAM_FLOAT, "wavelength", "The Wavelength of the Waves" },
{ PARAM_INT32, "type", "Type of waves, black/smeared" },
{ PARAM_INT32, "reflective", "Use Reflection" },
};
static int nargs = 8;
static GParamDef *rets = NULL;
static int nrets = 0;
gimp_install_procedure("plug_in_waves",
"Distort the image with waves",
"none yet",
"Eric L. Hernes, Stephen Norris",
"Stephen Norris",
"1997",
"<Image>/Filters/Distorts/Waves",
"RGB*, GRAY*",
PROC_PLUG_IN,
nargs, nrets,
args, rets);
}
static void
run(char *name, int nparam, GParam *param,
int *nretvals, GParam **retvals){
static GParam rvals[1];
struct piArgs args;
*nretvals = 1;
*retvals = rvals;
memset(&args,(int)0,sizeof(struct piArgs));
args.type=-1;
gimp_get_data("plug_in_waves", &args);
rvals[0].type = PARAM_STATUS;
rvals[0].data.d_status = STATUS_SUCCESS;
switch (param[0].data.d_int32) {
GDrawable *drw;
case RUN_INTERACTIVE:
/* XXX: add code here for interactive running */
if(args.type == -1) {
args.amplitude = 10.0;
args.wavelength = 10;
args.phase = 0.0;
args.type = 0;
args.reflective = 0;
}
drw = gimp_drawable_get(param[2].data.d_drawable);
mwp=mw_preview_build(drw);
if (pluginCoreIA(&args, param[2].data.d_drawable)==-1) {
rvals[0].data.d_status = STATUS_EXECUTION_ERROR;
} else {
gimp_set_data("plug_in_waves", &args, sizeof(struct piArgs));
}
break;
case RUN_NONINTERACTIVE:
/* XXX: add code here for non-interactive running */
if (nparam != 8) {
rvals[0].data.d_status = STATUS_CALLING_ERROR;
break;
}
args.amplitude = param[3].data.d_float;
args.phase = param[4].data.d_float;
args.wavelength = param[5].data.d_float;
args.type = param[6].data.d_int32;
args.reflective = param[7].data.d_int32;
if (pluginCore(&args, param[2].data.d_drawable)==-1) {
rvals[0].data.d_status = STATUS_EXECUTION_ERROR;
break;
}
break;
case RUN_WITH_LAST_VALS:
/* XXX: add code here for last-values running */
if (pluginCore(&args, param[2].data.d_drawable)==-1) {
rvals[0].data.d_status = STATUS_EXECUTION_ERROR;
}
break;
}
}
gint
pluginCore(struct piArgs *argp, gint32 drawable) {
gint retval=0;
GDrawable *drw;
GPixelRgn srcPr, dstPr;
guchar *src, *dst;
guint width, height, Bpp;
drw = gimp_drawable_get(drawable);
width = drw->width;
height = drw->height;
Bpp = drw->bpp;
src = (guchar*)malloc(width*height*Bpp);
dst = (guchar*)malloc(width*height*Bpp);
gimp_pixel_rgn_init (&srcPr, drw, 0, 0, width, height, FALSE, FALSE);
gimp_pixel_rgn_init (&dstPr, drw, 0, 0, width, height, TRUE, TRUE);
gimp_pixel_rgn_get_rect(&srcPr, src, 0, 0, width, height);
wave(src, dst, width, height, Bpp, argp->amplitude, argp->wavelength,
argp->phase, argp->type==0, argp->reflective, 1);
gimp_pixel_rgn_set_rect(&dstPr, dst, 0, 0, width, height);
free(src);
free(dst);
gimp_drawable_flush(drw);
gimp_drawable_merge_shadow (drw->id, TRUE);
gimp_drawable_update(drw->id, 0, 0, width, height);
gimp_displays_flush();
return retval;
}
gint
pluginCoreIA(struct piArgs *argp, gint32 drawable) {
gint r=-1; /* default to error return */
GtkWidget *dlg;
GtkWidget *frame;
GtkWidget *hbox;
GtkWidget *vbox;
GtkWidget *table;
GtkWidget *preview;
gint runp;
static struct mwRadioGroup mode[] = {
{ "Smear", 1 },
{ "Blacken", 0 },
{ NULL, 0 },
};
gchar **argv;
gint argc;
/* Set args */
argc = 1;
argv = g_new(gchar *, 1);
argv[0] = g_strdup("waves");
gtk_init(&argc, &argv);
gtk_rc_parse(gimp_gtkrc());
dlg = mw_app_new("plug_in_waves", "Waves", &runp);
hbox = gtk_hbox_new(FALSE, 5);
gtk_container_border_width(GTK_CONTAINER(hbox), 5);
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dlg)->vbox), hbox, TRUE, TRUE, 0);
gtk_widget_show(hbox);
vbox = gtk_vbox_new(FALSE, 0);
gtk_box_pack_start(GTK_BOX(hbox), vbox, FALSE, FALSE, 0);
gtk_widget_show(vbox);
preview = mw_preview_new(vbox, mwp, &waves_do_preview);
gtk_object_set_data(GTK_OBJECT(preview), "piArgs", argp);
gtk_object_set_data(GTK_OBJECT(preview), "mwRadioGroup", mode);
waves_do_preview(preview);
mw_toggle_button_new(vbox, NULL, "Reflective", &argp->reflective);
vbox = gtk_vbox_new(FALSE, 5);
gtk_box_pack_start(GTK_BOX(hbox), vbox, TRUE, TRUE, 0);
gtk_widget_show(vbox);
frame = gtk_frame_new("Parameters");
gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_ETCHED_IN);
gtk_box_pack_start(GTK_BOX(vbox), frame, FALSE, FALSE, 0);
gtk_widget_show(frame);
table = gtk_table_new(4, 2, FALSE);
gtk_container_border_width(GTK_CONTAINER (table), 5);
gtk_container_add(GTK_CONTAINER(frame), table);
mw_fscale_entry_new(table, "Amplitude", 0.0, 101.0, 1.0, 5.0, 0.0,
0, 1, 1, 2, &argp->amplitude);
mw_fscale_entry_new(table, "Phase", 0.0, 360.0, 2.0, 5.0, 0.0,
0, 1, 2, 3, &argp->phase);
mw_fscale_entry_new(table, "Wavelength", 0.1, 50.0, 1.0, 5.0, 0.0,
0, 1, 3, 4, &argp->wavelength);
gtk_widget_show(table);
mw_radio_group_new(vbox, "Mode", mode);
gtk_widget_show(table);
gtk_widget_show(dlg);
gtk_main();
gdk_flush();
argp->type = mw_radio_result(mode);
if(runp){
#if 0
fprintf(stderr, "running:\n");
/*fprintf(stderr, "\t(image %d)\n", argp->image);*/
fprintf(stderr, "\t(drawable %d)\n", argp->drawable);
fprintf(stderr, "\t(amplitude %f)\n", argp->amplitude);
fprintf(stderr, "\t(phase %f)\n", argp->phase);
fprintf(stderr, "\t(wavelength %f)\n", argp->wavelength);
fprintf(stderr, "\t(type %d)\n", argp->type);
fprintf(stderr, "\t(reflective %d)\n", argp->reflective);
#endif
return pluginCore(argp, drawable);
} else {
return r;
}
}
static void
waves_do_preview(GtkWidget *w) {
static GtkWidget *theWidget = NULL;
struct piArgs *argp;
struct mwRadioGroup *rgp;
guchar *dst;
gint y;
if(theWidget==NULL){
theWidget=w;
}
argp = gtk_object_get_data(GTK_OBJECT(theWidget), "piArgs");
rgp = gtk_object_get_data(GTK_OBJECT(theWidget), "mwRadioGroup");
argp->type = mw_radio_result(rgp);
dst = (guchar*)malloc(mwp->width*mwp->height*mwp->bpp);
wave(mwp->bits, dst, mwp->width, mwp->height,
mwp->bpp, (argp->amplitude/mwp->scale), (argp->wavelength/mwp->scale),
argp->phase, argp->type==0, argp->reflective, 0);
for(y=0;y<mwp->height; y++){
gtk_preview_draw_row(GTK_PREVIEW(theWidget),
dst+(y*mwp->width*mwp->bpp), 0, y,
mwp->width);
}
gtk_widget_draw(theWidget, NULL);
gdk_flush();
free(dst);
}
static void
wave(guchar *src, guchar *dst, gint width, gint height, gint bypp,
gdouble amplitude, gdouble wavelength, gdouble phase, gint smear,
gint reflective, gint verbose) {
long rowsiz;
guchar *p;
guchar *dest;
gint x1, y1, x2, y2;
gint x, y;
gint prog_interval=0;
gint x1_in, y1_in, x2_in, y2_in;
gdouble cen_x, cen_y; /* Center of wave */
gdouble xhsiz, yhsiz; /* Half size of selection */
gdouble radius, radius2; /* Radius and radius^2 */
gdouble amnt, d;
gdouble needx, needy;
gdouble dx, dy;
gdouble xscale, yscale;
gint xi, yi;
guchar values[4];
guchar val;
gint k;
phase = phase*M_PI/180;
rowsiz = width * bypp;
if (verbose) {
gimp_progress_init("Waves");
prog_interval=height/10;
}
x1=y1=0;
x2=width;
y2=height;
/* Wave the image. For each pixel in the destination image
* which is inside the selection, we compute the corresponding
* waved location in the source image. We use bilinear
* interpolation to avoid ugly jaggies.
*
* Let's assume that we are operating on a circular area.
* Every point within <radius> distance of the wave center is
* waveed to its destination position.
*
* Basically, introduce a wave into the image. I made up the
* forumla initially, but it looks good. Quartic added the
* wavelength etc. to it while I was asleep :) Just goes to show
* we should work with people in different time zones more.
*
*/
/* Center of selection */
cen_x = (double) (x2 - 1 + x1) / 2.0;
cen_y = (double) (y2 - 1 + y1) / 2.0;
/* Compute wave radii (semiaxes) */
xhsiz = (double) (x2 - x1) / 2.0;
yhsiz = (double) (y2 - y1) / 2.0;
/* These are the necessary scaling factors to turn the wave
ellipse into a large circle */
if (xhsiz < yhsiz) {
xscale = yhsiz / xhsiz;
yscale = 1.0;
} else if (xhsiz > yhsiz) {
xscale = 1.0;
yscale = xhsiz / yhsiz;
} else {
xscale = 1.0;
yscale = 1.0;
} /* else */
radius = MAX(xhsiz, yhsiz);
radius2 = radius * radius;
/* Wave the image! */
dst += y1 * rowsiz + x1 * bypp;
wavelength = (wavelength * 2);
for (y = y1; y < y2; y++) {
dest = dst;
if (verbose && (y % prog_interval == 0))
gimp_progress_update((double)y/(double)height);
for (x = x1; x < x2; x++) {
/* Distance from current point to wave center, scaled */
dx = (x - cen_x) * xscale;
dy = (y - cen_y) * yscale;
/* Distance^2 to center of *circle* (our scaled ellipse) */
d = sqrt(dx * dx + dy * dy);
/* Use the formula described above. */
/* Calculate waved point and scale again to ellipsify */
/*
* Reflective waves are strange - the effect is much
* more like a mirror which is in the shape of
* the wave than anything else.
*/
if (reflective){
amnt = amplitude * fabs(sin(((d / wavelength)
* (2.0 * M_PI) + phase)));
needx = (amnt * dx) / xscale + cen_x;
needy = (amnt * dy) / yscale + cen_y;
} else {
amnt = amplitude * sin(((d / wavelength)
* (2.0 * M_PI) + phase));
needx = (amnt + dx) / xscale + cen_x;
needy = (amnt + dy) / yscale + cen_y;
}
/* Calculations complete; now copy the proper pixel */
xi = needx;
yi = needy;
if (smear){
if (xi > width - 2){
xi = width - 2;
} else if (xi < 0){
xi = 0;
}
if (yi > height - 2){
yi = height - 2;
} else if (yi < 0){
yi = 0;
}
}
p = src + rowsiz * yi + xi * bypp;
x1_in = WITHIN(0, xi, width - 1);
y1_in = WITHIN(0, yi, height - 1);
x2_in = WITHIN(0, xi + 1, width - 1);
y2_in = WITHIN(0, yi + 1, height - 1);
for (k = 0; k < bypp; k++) {
if (x1_in && y1_in)
values[0] = *(p + k);
else
values[0] = 0;
if (x2_in && y1_in)
values[1] = *(p + bypp + k);
else
values[1] = 0;
if (x1_in && y2_in)
values[2] = *(p + rowsiz + k);
else
values[2] = 0;
if (x2_in) {
if (y2_in)
values[3] = *(p + bypp + k + rowsiz);
else
values[3] = 0;
} else
values[3] = 0;
val = bilinear(needx, needy, values);
*dest++ = val;
} /* for */
} /* for */
dst += rowsiz;
} /* for */
if (verbose) gimp_progress_update(1.0);
} /* wave */
static guchar
bilinear(gdouble x, gdouble y, guchar *v) {
double m0, m1;
x = fmod(x, 1.0);
y = fmod(y, 1.0);
if (x < 0)
x += 1.0;
if (y < 0)
y += 1.0;
m0 = (1.0 - x) * v[0] + x * v[1];
m1 = (1.0 - x) * v[2] + x * v[3];
return (guchar) ((1.0 - y) * m0 + y * m1);
} /* bilinear */
/*
* Local Variables:
* c-file-style: GNU
* mode: C
* c-auto-newline: t
*
* End:
*/
/* end of file waves/waves.c */
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