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gimp/plug-ins/common/emboss.c

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/**************************************************
* file: emboss/emboss.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.
*
* $Id$
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include <plug-ins/megawidget/megawidget.h>
#include "libgimp/stdplugins-intl.h"
static mw_preview_t emboss_do_preview;
enum
{
FUNCTION_BUMPMAP = 0,
FUNCTION_EMBOSS = 1
};
struct Grgb
{
guint8 red;
guint8 green;
guint8 blue;
};
struct GRegion
{
gint32 x;
gint32 y;
gint32 width;
gint32 height;
};
struct piArgs
{
gint32 img;
gint32 drw;
gdouble azimuth;
gdouble elevation;
gint32 depth;
gint32 embossp;
};
struct embossFilter
{
gdouble Lx;
gdouble Ly;
gdouble Lz;
gdouble Nz;
gdouble Nz2;
gdouble NzLz;
gdouble bg;
} Filter;
static void query (void);
static void run (gchar *name,
gint nparam,
GParam *param,
gint *nretvals,
GParam **retvals);
static gint pluginCore (struct piArgs *argp);
static gint pluginCoreIA (struct piArgs *argp);
static inline void EmbossInit (gdouble azimuth,
gdouble elevation,
gushort width45);
static inline void EmbossRow (guchar *src,
guchar *texture,
guchar *dst,
guint xSize,
guint bypp,
gint alpha);
#define DtoR(d) ((d)*(G_PI/(gdouble)180))
GPlugInInfo PLUG_IN_INFO =
{
NULL, /* init */
NULL, /* quit */
query, /* query */
run, /* run */
};
static struct mwPreview *thePreview;
MAIN ()
static void
query (void)
{
static GParamDef args[] =
{
{ PARAM_INT32, "run_mode", "Interactive, non-interactive" },
{ PARAM_IMAGE, "img", "The Image" },
{ PARAM_DRAWABLE, "drw", "The Drawable" },
{ PARAM_FLOAT, "azimuth", "The Light Angle (degrees)" },
{ PARAM_FLOAT, "elevation", "The Elevation Angle (degrees)" },
{ PARAM_INT32, "depth", "The Filter Width" },
{ PARAM_INT32, "embossp", "Emboss or Bumpmap" },
};
static gint nargs = sizeof (args) / sizeof (args[0]);
static GParamDef *rets = NULL;
static gint nrets = 0;
INIT_I18N();
gimp_install_procedure ("plug_in_emboss",
_("Emboss filter"),
_("Emboss or Bumpmap the given drawable, specifying the angle and elevation for the light source."),
"Eric L. Hernes, John Schlag",
"Eric L. Hernes",
"1997",
N_("<Image>/Filters/Distorts/Emboss..."),
"RGB",
PROC_PLUG_IN,
nargs, nrets,
args, rets);
}
static void
run (gchar *name,
gint nparam,
GParam *param,
gint *nretvals,
GParam **retvals)
{
static GParam rvals[1];
struct piArgs args;
GDrawable *drw;
*nretvals = 1;
*retvals = rvals;
memset(&args, (int) 0, sizeof (struct piArgs));
rvals[0].type = PARAM_STATUS;
rvals[0].data.d_status = STATUS_SUCCESS;
switch (param[0].data.d_int32)
{
case RUN_INTERACTIVE:
INIT_I18N_UI();
gimp_get_data ("plug_in_emboss", &args);
if (args.img == 0 && args.drw == 0)
{
/* initial conditions */
args.azimuth = 30.0;
args.elevation = 45.0;
args.depth = 20;
args.embossp = FUNCTION_EMBOSS;
}
args.img = param[1].data.d_image;
args.drw = param[2].data.d_drawable;
drw = gimp_drawable_get (args.drw);
thePreview = mw_preview_build(drw);
if (pluginCoreIA (&args) == -1)
{
rvals[0].data.d_status = STATUS_EXECUTION_ERROR;
}
else
{
gimp_set_data ("plug_in_emboss", &args, sizeof (struct piArgs));
}
break;
case RUN_NONINTERACTIVE:
if (nparam != 7)
{
rvals[0].data.d_status = STATUS_CALLING_ERROR;
break;
}
INIT_I18N();
args.img = param[1].data.d_image;
args.drw = param[2].data.d_drawable;
args.azimuth = param[3].data.d_float;
args.elevation = param[4].data.d_float;
args.depth = param[5].data.d_int32;
args.embossp = param[6].data.d_int32;
if (pluginCore(&args)==-1)
{
rvals[0].data.d_status = STATUS_EXECUTION_ERROR;
break;
}
break;
case RUN_WITH_LAST_VALS:
INIT_I18N();
gimp_get_data("plug_in_emboss", &args);
/* use this image and drawable, even with last args */
args.img = param[1].data.d_image;
args.drw = param[2].data.d_drawable;
if (pluginCore(&args)==-1) {
rvals[0].data.d_status = STATUS_EXECUTION_ERROR;
}
break;
}
}
#define pixelScale 255.9
static void
EmbossInit (gdouble azimuth,
gdouble elevation,
gushort width45)
{
/*
* compute the light vector from the input parameters.
* normalize the length to pixelScale for fast shading calculation.
*/
Filter.Lx = cos (azimuth) * cos (elevation) * pixelScale;
Filter.Ly = sin (azimuth) * cos (elevation) * pixelScale;
Filter.Lz = sin (elevation) * pixelScale;
/*
* constant z component of image surface normal - this depends on the
* image slope we wish to associate with an angle of 45 degrees, which
* depends on the width of the filter used to produce the source image.
*/
Filter.Nz = (6 * 255) / width45;
Filter.Nz2 = Filter.Nz * Filter.Nz;
Filter.NzLz = Filter.Nz * Filter.Lz;
/* optimization for vertical normals: L.[0 0 1] */
Filter.bg = Filter.Lz;
}
/*
* ANSI C code from the article
* "Fast Embossing Effects on Raster Image Data"
* by John Schlag, jfs@kerner.com
* in "Graphics Gems IV", Academic Press, 1994
*
*
* Emboss - shade 24-bit pixels using a single distant light source.
* Normals are obtained by differentiating a monochrome 'bump' image.
* The unary case ('texture' == NULL) uses the shading result as output.
* The binary case multiples the optional 'texture' image by the shade.
* Images are in row major order with interleaved color components (rgbrgb...).
* E.g., component c of pixel x,y of 'dst' is dst[3*(y*xSize + x) + c].
*
*/
static inline void
EmbossRow (guchar *src,
guchar *texture,
guchar *dst,
guint xSize,
guint bypp,
gint alpha)
{
glong Nx, Ny, NdotL;
guchar *s1, *s2, *s3;
gint x, shade, b;
gint bytes;
/* mung pixels, avoiding edge pixels */
s1 = src + bypp;
s2 = s1 + (xSize * bypp);
s3 = s2 + (xSize * bypp);
dst += bypp;
bytes = (alpha) ? bypp - 1 : bypp;
if (texture)
texture += bypp;
for (x = 1; x < xSize - 1; x++, s1 += bypp, s2 += bypp, s3 += bypp)
{
/*
* compute the normal from the src map. the type of the
* expression before the cast is compiler dependent. in
* some cases the sum is unsigned, in others it is
* signed. ergo, cast to signed.
*/
Nx = (int) (s1[-(int)bypp] + s2[-(int)bypp] + s3[-(int)bypp]
- s1[bypp] - s2[bypp] - s3[bypp]);
Ny = (int) (s3[-(int)bypp] + s3[0] + s3[bypp] - s1[-(int)bypp]
- s1[0] - s1[bypp]);
/* shade with distant light source */
if ( Nx == 0 && Ny == 0 )
shade = Filter.bg;
else if ( (NdotL = Nx * Filter.Lx + Ny * Filter.Ly + Filter.NzLz) < 0 )
shade = 0;
else
shade = NdotL / sqrt(Nx*Nx + Ny*Ny + Filter.Nz2);
/* do something with the shading result */
if (texture)
{
for (b = 0; b < bytes; b++)
{
*dst++ = (*texture++ * shade) >> 8;
}
if (alpha)
{
*dst++ = s2[bytes]; /* preserve the alpha */
texture++;
}
}
else
{
for (b = 0; b < bytes; b++)
{
*dst++ = shade;
}
if (alpha)
*dst++ = s2[bytes]; /* preserve the alpha */
}
}
if (texture)
texture += bypp;
}
static gint
pluginCore (struct piArgs *argp)
{
GDrawable *drw;
GPixelRgn src, dst;
gint p_update;
gint y;
gint x1, y1, x2, y2;
guint width, height;
gint bypp, rowsize, has_alpha;
guchar *srcbuf, *dstbuf;
drw = gimp_drawable_get (argp->drw);
gimp_drawable_mask_bounds (argp->drw, &x1, &y1, &x2, &y2);
/* expand the bounds a little */
x1 = MAX (0, x1 - 5);
y1 = MAX (0, y1 - 5);
x2 = MIN (drw->width, x2 + 5);
y2 = MIN (drw->height, y2 + 5);
width = x2 - x1;
height = y2 - y1;
bypp = drw->bpp;
p_update = height / 20;
rowsize = width * bypp;
has_alpha = gimp_drawable_has_alpha (argp->drw);
gimp_pixel_rgn_init (&src, drw, x1, y1, width, height, FALSE, FALSE);
gimp_pixel_rgn_init (&dst, drw, x1, y1, width, height, TRUE, TRUE);
srcbuf = g_new (guchar, rowsize * 3);
dstbuf = g_new (guchar, rowsize);
memset (srcbuf, 0, (size_t) rowsize * 3);
memset (dstbuf, 0, (size_t) rowsize);
EmbossInit (DtoR(argp->azimuth), DtoR(argp->elevation), argp->depth);
gimp_progress_init (_("Emboss"));
gimp_tile_cache_ntiles ((width + gimp_tile_width () - 1) / gimp_tile_width ());
/* first row */
gimp_pixel_rgn_get_rect (&src, srcbuf, x1, y1, width, 3);
memcpy (srcbuf, srcbuf + rowsize, rowsize);
EmbossRow (srcbuf, argp->embossp ? (guchar *) 0 : srcbuf,
dstbuf, width, bypp, has_alpha);
gimp_pixel_rgn_set_row (&dst, dstbuf, 0, 0, width);
/* last row */
gimp_pixel_rgn_get_rect (&src, srcbuf, x1, y2-3, width, 3);
memcpy (srcbuf + rowsize * 2, srcbuf + rowsize, rowsize);
EmbossRow (srcbuf, argp->embossp ? (guchar *) 0 : srcbuf,
dstbuf, width, bypp, has_alpha);
gimp_pixel_rgn_set_row (&dst, dstbuf, x1, y2-1, width);
for (y = 0; y < height - 2; y++)
{
if (y % p_update == 0)
gimp_progress_update ((gdouble) y / (gdouble) height);
gimp_pixel_rgn_get_rect (&src, srcbuf, x1, y1+y, width, 3);
EmbossRow (srcbuf, argp->embossp ? (guchar *) 0 : srcbuf,
dstbuf, width, bypp, has_alpha);
gimp_pixel_rgn_set_row (&dst, dstbuf, x1, y1+y+1, width);
}
g_free (srcbuf);
g_free (dstbuf);
gimp_drawable_flush (drw);
gimp_drawable_merge_shadow (drw->id, TRUE);
gimp_drawable_update (drw->id, x1, y1, width, height);
gimp_displays_flush ();
return 0;
}
gboolean run_flag = FALSE;
static void
emboss_ok_callback (GtkWidget *widget,
gpointer data)
{
run_flag = TRUE;
gtk_widget_destroy (GTK_WIDGET (data));
}
static void
emboss_radio_button_callback (GtkWidget *widget,
gpointer data)
{
gint *toggle_val;
toggle_val = (gint32 *) data;
*toggle_val = (gint32) gtk_object_get_user_data (GTK_OBJECT (widget));
if (do_preview)
emboss_do_preview (NULL);
}
static void
emboss_float_adjustment_callback (GtkAdjustment *adj,
gpointer data)
{
gdouble *value;
value = (gdouble *) data;
*value = adj->value;
if (do_preview)
emboss_do_preview (NULL);
}
static void
emboss_int_adjustment_callback (GtkAdjustment *adj,
gpointer data)
{
gint *value;
value = (gint *) data;
*value = (gint) adj->value;
if (do_preview)
emboss_do_preview (NULL);
}
static gint
pluginCoreIA (struct piArgs *argp)
{
GtkWidget *dlg;
GtkWidget *main_vbox;
GtkWidget *hbox;
GtkWidget *table;
GtkWidget *preview;
GtkWidget *frame;
GtkObject *adj;
gchar **argv;
gint argc;
argc = 1;
argv = g_new (gchar *, 1);
argv[0] = g_strdup ("emboss");
gtk_init (&argc, &argv);
gtk_rc_parse (gimp_gtkrc ());
dlg = gimp_dialog_new (_("Emboss"), "emboss",
gimp_plugin_help_func, "filters/emboss.html",
GTK_WIN_POS_MOUSE,
FALSE, TRUE, FALSE,
_("OK"), emboss_ok_callback,
NULL, NULL, NULL, TRUE, FALSE,
_("Cancel"), gtk_widget_destroy,
NULL, 1, NULL, FALSE, TRUE,
NULL);
gtk_signal_connect (GTK_OBJECT (dlg), "destroy",
GTK_SIGNAL_FUNC (gtk_main_quit),
NULL);
main_vbox = gtk_vbox_new (FALSE, 4);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 6);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), main_vbox,
TRUE, TRUE, 0);
gtk_widget_show (main_vbox);
hbox = gtk_hbox_new (FALSE, 5);
gtk_box_pack_start (GTK_BOX (main_vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
preview = mw_preview_new (hbox, thePreview, &emboss_do_preview);
gtk_object_set_data (GTK_OBJECT (preview), "piArgs", argp);
emboss_do_preview (preview);
frame = gimp_radio_group_new2 (TRUE, _("Function"),
emboss_radio_button_callback,
&argp->embossp, (gpointer) argp->embossp,
_("Bumpmap"), (gpointer) FUNCTION_BUMPMAP, NULL,
_("Emboss"), (gpointer) FUNCTION_EMBOSS, NULL,
NULL);
gtk_box_pack_start (GTK_BOX (hbox), frame, TRUE, TRUE, 0);
gtk_widget_show (frame);
frame = gtk_frame_new (_("Parameters"));
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
table = gtk_table_new (3, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 4);
gtk_table_set_row_spacings (GTK_TABLE (table), 2);
gtk_container_set_border_width (GTK_CONTAINER (table), 4);
gtk_container_add (GTK_CONTAINER (frame), table);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("Azimuth:"), 100, 0,
argp->azimuth, 0.0, 360.0, 1.0, 10.0, 2,
NULL, NULL);
gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
GTK_SIGNAL_FUNC (emboss_float_adjustment_callback),
&argp->azimuth);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("Elevation:"), 100, 0,
argp->elevation, 0.0, 180.0, 1.0, 10.0, 2,
NULL, NULL);
gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
GTK_SIGNAL_FUNC (emboss_float_adjustment_callback),
&argp->elevation);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 2,
_("Depth:"), 100, 0,
argp->depth, 1.0, 100.0, 1.0, 5.0, 0,
NULL, NULL);
gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
GTK_SIGNAL_FUNC (emboss_int_adjustment_callback),
&argp->depth);
gtk_widget_show (table);
gtk_widget_show (dlg);
gtk_main ();
gdk_flush ();
if (run_flag)
return pluginCore (argp);
else
return -1;
}
static void
emboss_do_preview (GtkWidget *w)
{
static GtkWidget *theWidget = NULL;
struct piArgs *ap;
guchar *dst, *c;
gint y, rowsize;
if (theWidget == NULL)
{
theWidget = w;
}
ap = gtk_object_get_data (GTK_OBJECT (theWidget), "piArgs");
rowsize = thePreview->width * thePreview->bpp;
dst = g_malloc (rowsize);
c = g_malloc (rowsize * 3);
memcpy (c, thePreview->bits, rowsize);
memcpy (c + rowsize, thePreview->bits, rowsize * 2);
EmbossInit (DtoR (ap->azimuth), DtoR (ap->elevation), ap->depth);
EmbossRow (c, ap->embossp ? (guchar *) 0 : c,
dst, thePreview->width, thePreview->bpp, FALSE);
gtk_preview_draw_row (GTK_PREVIEW (theWidget),
dst, 0, 0, thePreview->width);
memcpy (c,
thePreview->bits + ((thePreview->height-2) * rowsize),
rowsize * 2);
memcpy (c + (rowsize * 2),
thePreview->bits + ((thePreview->height - 1) * rowsize),
rowsize);
EmbossRow (c, ap->embossp ? (guchar *) 0 : c,
dst, thePreview->width, thePreview->bpp, FALSE);
gtk_preview_draw_row (GTK_PREVIEW (theWidget),
dst, 0, thePreview->height - 1, thePreview->width);
g_free (c);
for (y = 0, c = thePreview->bits; y<thePreview->height - 2; y++, c += rowsize)
{
EmbossRow (c, ap->embossp ? (guchar *) 0 : c,
dst, thePreview->width, thePreview->bpp, FALSE);
gtk_preview_draw_row (GTK_PREVIEW (theWidget),
dst, 0, y, thePreview->width);
}
gtk_widget_draw (theWidget, NULL);
gdk_flush ();
g_free (dst);
}
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