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gimp/plug-ins/common/gee.c

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/*
* (c) Adam D. Moss : 1998-2000 : adam@gimp.org : adam@foxbox.org
*
* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#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-the-slimy-egg"
#define PLUG_IN_BINARY "gee"
/* These aren't really redefinable, easily. */
#define IWIDTH 256
#define IHEIGHT 256
/* 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 void do_fun (void);
static void window_response_callback (GtkWidget *widget);
static gboolean do_iteration (void);
static void render_frame (void);
static void init_preview_misc (void);
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
/* Global widgets'n'stuff */
static guchar *disp; /* RGBX preview data */
static guchar *env; /* src warping image data */
static guchar *bump1base;
static guchar *bump1;
static guchar *bump2base;
static guchar *bump2;
static guchar *srcbump;
static guchar *destbump;
static guint idle_tag;
static GtkWidget *drawing_area;
static gint32 image_id;
static GimpDrawable *drawable;
static GimpImageBaseType imagetype;
static guchar *palette;
static gint ncolours;
MAIN ()
static void
query (void)
{
static const GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "run-mode", "The run mode { RUN-INTERACTIVE (0) }" },
{ GIMP_PDB_IMAGE, "image", "Input Image" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input Drawable" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("A big hello from the GIMP team!"),
"Beyond help.",
"Adam D. Moss <adam@gimp.org>",
"Adam D. Moss <adam@gimp.org>",
"2000",
N_("Gee Slime"),
"RGB*, INDEXED*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
}
static void
run (const gchar *name,
gint n_params,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
*nreturn_vals = 1;
*return_vals = values;
run_mode = param[0].data.d_int32;
INIT_I18N ();
if (run_mode == GIMP_RUN_NONINTERACTIVE ||
n_params != 3)
{
status = GIMP_PDB_CALLING_ERROR;
}
if (status == GIMP_PDB_SUCCESS)
{
image_id = param[1].data.d_image;
drawable = gimp_drawable_get (param[2].data.d_drawable);
if (drawable)
do_fun ();
else
status = GIMP_PDB_CALLING_ERROR;
}
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
}
static void
build_dialog (void)
{
GtkWidget *dialog;
GtkWidget *button;
GtkWidget *frame;
gchar *tmp;
gimp_ui_init (PLUG_IN_BINARY, TRUE);
dialog = gimp_dialog_new (_("Gee Slime"), PLUG_IN_BINARY,
NULL, 0,
gimp_standard_help_func, PLUG_IN_PROC,
NULL);
button = gtk_dialog_add_button (GTK_DIALOG (dialog),
_("Thank You for Choosing GIMP"),
GTK_RESPONSE_OK);
g_signal_connect (dialog, "response",
G_CALLBACK (window_response_callback),
NULL);
tmp = g_strdup_printf (_("A less obsolete creation by %s"),
"Adam D. Moss / adam@gimp.org / adam@foxbox.org "
"/ 1998-2000");
gimp_help_set_help_data (button, tmp, NULL);
g_free (tmp);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_container_set_border_width (GTK_CONTAINER (frame), 12);
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
drawing_area = gtk_drawing_area_new ();
gtk_widget_set_size_request (drawing_area, IWIDTH, IHEIGHT);
gtk_container_add (GTK_CONTAINER (frame), drawing_area);
gtk_widget_show (drawing_area);
gtk_widget_show (dialog);
idle_tag = g_idle_add_full (G_PRIORITY_LOW,
(GSourceFunc) do_iteration,
NULL,
NULL);
}
/* #define LIGHT 0x19
#define LIGHT 0x1a
#define LIGHT 0x21 */
#define LIGHT 0x0d
static guchar llut[256];
static void
gen_llut (void)
{
int i,k;
for (i = 0; i < 256; i++)
{
k = i + ((LIGHT * ( /* (255*255)- */ i * i)) / (255 * 255));
k = k + 8;
k = (k > 255 ? 255 : k);
llut[i] = k;
}
}
static void
do_fun (void)
{
imagetype = gimp_image_base_type (image_id);
if (imagetype == GIMP_INDEXED)
palette = gimp_image_get_colormap (image_id, &ncolours);
else
if (imagetype == GIMP_GRAY)
{
int i;
palette = g_new (guchar, 256 * 3);
for (i = 0; i < 256; i++)
{
palette[i * 3 + 0] =
palette[i * 3 + 1] =
palette[i * 3 + 2] = i;
}
}
/* cache hint */
gimp_tile_cache_ntiles (1);
init_preview_misc ();
build_dialog ();
gen_llut ();
render_frame ();
gtk_main ();
}
static void
show (void)
{
if (gtk_widget_is_drawable (drawing_area))
{
GtkStyle *style = gtk_widget_get_style (drawing_area);
gdk_draw_rgb_32_image (gtk_widget_get_window (drawing_area),
style->white_gc,
0, 0, IWIDTH, IHEIGHT,
GDK_RGB_DITHER_NORMAL,
disp, IWIDTH * 4);
}
}
/* Rendering Functions */
static void
bumpbob (int x, int y, int size)
{
gint j;
for (j = 0; j < size; j++)
{
int i;
for (i = 0; i < size; i++)
{
int k;
#define BOB_INC 45
k = destbump[i + x + (y + j) * IWIDTH] + BOB_INC;
if (k & 256)
destbump[i + x + (y + j) * IWIDTH] = 255;
else
destbump[i + x + (y + j) * IWIDTH] = k;
}
}
}
/* Adam's sillier algorithm. */
static void
iterate (void)
{
static guint frame = 0;
gint i, j;
gint thisbump;
guchar sx, sy;
guint32 *dest;
guint32 *environment;
guchar *basebump;
guint basesx;
guint basesy;
GRand *gr;
#define bx (-(123-128))
#define by (128+123)
#define cx (by)
#define cy (-bx)
#define bycxmcybx (by*cx-cy*bx)
#define bx2 (((bx)<<19)/bycxmcybx)
#define by2 (((by)<<19)/bycxmcybx)
#define cx2 (((cx)<<19)/bycxmcybx)
#define cy2 (((cy)<<19)/bycxmcybx)
gr = g_rand_new ();
frame++;
environment = (guint32*) env;
dest = (guint32*) disp;
srcbump = (frame & 1) ? bump1 : bump2;
destbump = (frame & 1) ? bump2 : bump1;
/* A little sub-pixel jitter to liven things up. */
basesx = (g_rand_int_range (gr, 0, 29 << 19) / bycxmcybx) +
((-128 -((128 * 256) / (cx + bx))) << 11);
basesy = (g_rand_int_range (gr, 0, 29 << 19) / bycxmcybx) +
((-128 - ((128 * 256) / (cy + by))) << 11);
basebump = srcbump;
/* MELT DISTORTION MAP, APPLY IT */
j = IHEIGHT;
while (j--)
{
guint tx;
guint ty;
ty = (basesy += cx2);
tx = (basesx -= bx2);
i = IWIDTH;
while (i--)
{
guchar *bptr =
(srcbump + (
(
((255 & (
(tx >> 11)
)))
|
((((255 & (
(ty >> 11)
)) << 8)))
)
));
thisbump = (11 * *(basebump) + (
*(bptr - IWIDTH) +
*(bptr - 1) +
*(bptr) +
*(bptr + 1) +
*(bptr + IWIDTH)
)
);
basebump++;
tx += by2;
ty -= cy2;
/* TODO: Can accelerate search for non-zero bumps with
casting an aligned long-word search. */
if (thisbump == 0)
{
*(dest++) = *( environment + (i | (j << 8)));
*(destbump++) = 0;
}
else
{
if (thisbump <= (131 << 4))
{
thisbump >>= 4;
*destbump = thisbump;
}
else
*destbump = thisbump = 131;
sy = j + (((thisbump) - *(destbump + IWIDTH)));
sx = i + (((thisbump) - *(++destbump)));
*dest++ = *(environment + (sx | (sy << 8)));
}
}
}
srcbump = (frame & 1) ? bump1 : bump2;
destbump = (frame & 1) ? bump2 : bump1;
dest = (guint32 *) disp;
memset(destbump, 0, IWIDTH);
#if 1
/* CAUSTICS! */
/* The idea here is that we refract IWIDTH*IHEIGHT parallel rays
through the surface of the slime and illuminate the points
where they hit the backing-image. There are some unrealistic
shortcuts taken, but the result is quite pleasing.
*/
j = IHEIGHT;
while (j--)
{
i = IWIDTH;
while (i--)
{
/* Apply caustics */
sx = *(destbump++);
if (sx != 0)
{
guchar *cptr;
sy = j + (((sx) - *(destbump + IWIDTH - 1)));
sx = i + (((sx) - *(destbump)));
cptr = (guchar*)(dest + (0xffff ^ (sx | (sy << 8))));
*cptr = llut[*cptr]; cptr++;
*cptr = llut[*cptr]; cptr++;
*cptr = llut[*cptr];
/* this second point of light's offset (1 across, 1 down)
isn't really 'right' but it gives a more pleasing,
diffuse look. */
cptr += 2 + IWIDTH * 4;
*cptr = llut[*cptr]; cptr++;
*cptr = llut[*cptr]; cptr++;
*cptr = llut[*cptr];
}
}
}
#endif
/* Interactive bumpmap */
#define BOBSIZE 6
#define BOBSPREAD 40
#define BOBS_PER_FRAME 70
destbump = (frame & 1) ? bump2 : bump1;
{
gint rxp, ryp, posx, posy;
GdkModifierType mask;
gint size, i;
gdk_window_get_pointer (gtk_widget_get_window (drawing_area),
&rxp, &ryp, &mask);
for (i = 0; i < BOBS_PER_FRAME; i++)
{
size = g_rand_int_range (gr, 1, BOBSIZE);
posx = rxp + BOBSPREAD/2 -
RINT (sqrt (g_rand_double_range (gr, 0, BOBSPREAD)) *
g_rand_int_range (gr, 0, BOBSPREAD));
posy = ryp + BOBSPREAD/2 -
RINT (sqrt (g_rand_double_range (gr, 0, BOBSPREAD)) *
g_rand_int_range (gr, 0, BOBSPREAD));
if (! ((posx < 1) || (posx > IWIDTH-size) ||
(posy < 1) || (posy > IHEIGHT-size)))
bumpbob (posx, posy, size);
}
}
}
static void
render_frame (void)
{
iterate ();
show ();
}
static void
init_preview_misc (void)
{
GimpPixelRgn pixel_rgn;
gint i;
gboolean has_alpha;
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
env = g_new (guchar, 4 * IWIDTH * IHEIGHT * 2);
disp = g_new (guchar, (IWIDTH + 2 + IWIDTH * IHEIGHT) * 4);
bump1base = g_new (guchar, IWIDTH * IHEIGHT + IWIDTH + IWIDTH);
bump2base = g_new (guchar, IWIDTH * IHEIGHT + IWIDTH + IWIDTH);
bump1 = &bump1base[IWIDTH];
bump2 = &bump2base[IWIDTH];
if ((drawable->width < 256) || (drawable->height < 256))
{
for (i = 0; i < 256; i++)
{
if (i < drawable->height)
{
gimp_pixel_rgn_init (&pixel_rgn,
drawable,
drawable->width > 256 ?
drawable->width / 2 - 128 : 0,
(drawable->height > 256 ?
drawable->height / 2 - 128 : 0 ) + i,
MIN (256 , drawable->width),
1,
FALSE,
FALSE);
gimp_pixel_rgn_get_rect (&pixel_rgn,
&env[(256 * i +
(
(
drawable->width < 256 ?
(256 - drawable->width) / 2 : 0
)
+
(
drawable->height < 256 ?
(256 - drawable->height) / 2 : 0
) * 256
)) *
gimp_drawable_bpp (drawable->drawable_id)
],
drawable->width > 256 ?
(drawable->width / 2 - 128) : 0,
(drawable->height > 256 ?
(drawable->height / 2 - 128) : 0) + i,
MIN (256, drawable->width),
1);
}
}
}
else
{
gimp_pixel_rgn_init (&pixel_rgn,
drawable,
drawable->width > 256 ? (drawable->width / 2 - 128) : 0,
drawable->height > 256 ? (drawable->height / 2 - 128) : 0,
MIN (256, drawable->width),
MIN (256, drawable->height),
FALSE,
FALSE);
gimp_pixel_rgn_get_rect (&pixel_rgn,
env,
drawable->width > 256 ? (drawable->width / 2 - 128) : 0,
drawable->height > 256 ? (drawable->height / 2 - 128) : 0,
MIN (256, drawable->width),
MIN (256, drawable->height));
}
gimp_drawable_detach (drawable);
/* convert the image data of varying types into flat grey or rgb. */
switch (imagetype)
{
case GIMP_GRAY:
case GIMP_INDEXED:
if (has_alpha)
{
for (i = IWIDTH * IHEIGHT; i > 0; i--)
{
env[4 * (i - 1) + 2] =
((palette[3 * (env[(i - 1) * 2]) + 2] *
env[(i - 1) * 2 + 1]) / 255)
+ ((255 - env[(i - 1) * 2 + 1]) *
((i & 255) ^ (i >> 8))) / 255;
env[4 * (i - 1) + 1] =
((palette[3 * (env[(i - 1) * 2]) + 1] *
env[(i - 1) * 2 + 1])/255)
+ ((255 - env[(i - 1) * 2 + 1]) *
((i & 255) ^ (i >> 8))) / 255;
env[4 * (i - 1) + 0] =
((palette[3 * (env[(i - 1) * 2]) + 0]
* env[(i - 1) * 2 + 1]) / 255)
+ ((255 - env[(i - 1) * 2 + 1])
* ((i & 255) ^ (i >> 8))) / 255;
}
}
else
{
for (i = IWIDTH * IHEIGHT; i > 0; i--)
{
env[4 * (i - 1) + 2] = palette[3 * (env[i - 1]) + 2];
env[4 * (i - 1) + 1] = palette[3 * (env[i - 1]) + 1];
env[4 * (i - 1) + 0] = palette[3 * (env[i - 1]) + 0];
}
}
break;
case GIMP_RGB:
if (has_alpha)
{
for (i = 0; i < IWIDTH * IHEIGHT; i++)
{
env[i * 4 + 2] =
(env[i * 4 + 2] * env[i * 4 + 3]) / 255
+ ((255 - env[i * 4 + 3]) * ((i & 255) ^ (i >> 8))) / 255;
env[i * 4 + 1] =
(env[i * 4 + 1] * env[i * 4 + 3]) / 255
+ ((255 - env[i * 4 + 3]) * ((i & 255) ^ (i >> 8))) / 255;
env[i * 4 + 0] =
(env[i * 4 + 0] * env[i * 4 + 3]) / 255
+ ((255 - env[i * 4 + 3]) * ((i & 255) ^ (i >> 8))) / 255;
}
}
else
{
for (i = IWIDTH * IHEIGHT; i > 0; i--)
{
env[4 * (i - 1) + 2] = env[(i - 1) * 3 + 2];
env[4 * (i - 1) + 1] = env[(i - 1) * 3 + 1];
env[4 * (i - 1) + 0] = env[(i - 1) * 3 + 0];
}
}
break;
default:
break;
}
/* Finally, 180-degree flip the environmental image! */
for (i = 0; i < IWIDTH * IHEIGHT / 2; i++)
{
guchar t;
t = env[4 * i + 0];
env[4 * i + 0] = env[4 * (IWIDTH * IHEIGHT - (i + 1)) + 0];
env[4 * (IWIDTH * IHEIGHT - (i + 1)) + 0] = t;
t = env[4 * i + 1];
env[4 * i + 1] = env[4 * (IWIDTH * IHEIGHT - (i + 1)) + 1];
env[4 * (IWIDTH * IHEIGHT - (i + 1)) + 1] = t;
t = env[4 * i + 2];
env[4 * i + 2] = env[4 * (IWIDTH * IHEIGHT - (i + 1)) + 2];
env[4 * (IWIDTH * IHEIGHT - (i + 1)) + 2] = t;
}
}
static gboolean
do_iteration (void)
{
render_frame ();
show ();
return TRUE;
}
static void
window_response_callback (GtkWidget *widget)
{
g_source_remove (idle_tag);
idle_tag = 0;
gtk_widget_destroy (widget);
}
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