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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.
*/
#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-emboss"
#define PLUG_IN_BINARY "emboss"
#define PLUG_IN_ROLE "gimp-emboss"
enum
{
FUNCTION_BUMPMAP = 0,
FUNCTION_EMBOSS = 1
};
typedef struct
{
gdouble azimuth;
gdouble elevation;
gint32 depth;
gint32 embossp;
} piArgs;
static piArgs evals =
{
30.0, /* azimuth */
45.0, /* elevation */
20, /* depth */
1 /* emboss */
};
struct embossFilter
{
gdouble Lx;
gdouble Ly;
gdouble Lz;
gdouble Nz;
gdouble Nz2;
gdouble NzLz;
gdouble bg;
} static Filter;
static void query (void);
static void run (const gchar *name,
gint nparam,
const GimpParam *param,
gint *nretvals,
GimpParam **retvals);
static void emboss (GimpDrawable *drawable,
GimpPreview *preview);
static gboolean emboss_dialog (GimpDrawable *drawable);
static void emboss_init (gdouble azimuth,
gdouble elevation,
gushort width45);
static void emboss_row (const guchar *src,
const guchar *texture,
guchar *dst,
guint width,
guint bypp,
gboolean alpha);
#define DtoR(d) ((d)*(G_PI/(gdouble)180))
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init */
NULL, /* quit */
query, /* query */
run, /* run */
};
MAIN ()
static void
query (void)
{
static const GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "run-mode", "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
{ GIMP_PDB_IMAGE, "image", "The Image" },
{ GIMP_PDB_DRAWABLE, "drawable", "The Drawable" },
{ GIMP_PDB_FLOAT, "azimuth", "The Light Angle (degrees)" },
{ GIMP_PDB_FLOAT, "elevation", "The Elevation Angle (degrees)" },
{ GIMP_PDB_INT32, "depth", "The Filter Width" },
{ GIMP_PDB_INT32, "emboss", "Emboss or Bumpmap" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Simulate an image created by embossing"),
"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_("_Emboss..."),
"RGB*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Filters/Distorts");
}
static void
run (const gchar *name,
gint nparam,
const GimpParam *param,
gint *nretvals,
GimpParam **retvals)
{
static GimpParam rvals[1];
GimpDrawable *drawable;
*nretvals = 1;
*retvals = rvals;
INIT_I18N ();
drawable = gimp_drawable_get (param[2].data.d_drawable);
gimp_tile_cache_ntiles (drawable->ntile_cols);
rvals[0].type = GIMP_PDB_STATUS;
rvals[0].data.d_status = GIMP_PDB_SUCCESS;
switch (param[0].data.d_int32)
{
case GIMP_RUN_INTERACTIVE:
gimp_get_data (PLUG_IN_PROC, &evals);
if (! emboss_dialog (drawable))
{
rvals[0].data.d_status = GIMP_PDB_CANCEL;
}
else
{
gimp_set_data (PLUG_IN_PROC, &evals, sizeof (piArgs));
}
break;
case GIMP_RUN_NONINTERACTIVE:
if (nparam != 7)
{
rvals[0].data.d_status = GIMP_PDB_CALLING_ERROR;
break;
}
evals.azimuth = param[3].data.d_float;
evals.elevation = param[4].data.d_float;
evals.depth = param[5].data.d_int32;
evals.embossp = param[6].data.d_int32;
emboss (drawable, NULL);
break;
case GIMP_RUN_WITH_LAST_VALS:
gimp_get_data (PLUG_IN_PROC, &evals);
/* use this image and drawable, even with last args */
emboss (drawable, NULL);
break;
}
}
#define pixelScale 255.9
static void
emboss_init (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*width + x) + c].
*
*/
static void
emboss_row (const guchar *src,
const guchar *texture,
guchar *dst,
guint width,
guint bypp,
gboolean alpha)
{
const guchar *s[3];
gdouble M[3][3];
gint x, bytes;
/* mung pixels, avoiding edge pixels */
s[0] = src;
s[1] = s[0] + (width * bypp);
s[2] = s[1] + (width * bypp);
dst += bypp;
bytes = (alpha) ? bypp - 1 : bypp;
if (texture)
texture += (width + 1) * bypp;
for (x = 1; x < width - 1; x++)
{
gdouble a;
glong Nx, Ny, NdotL;
gint shade, b;
gint i, j;
for (i = 0; i < 3; i++)
for (j = 0; j < 3; j++)
M[i][j] = 0.0;
for (b = 0; b < bytes; b++)
{
for (i = 0; i < 3; i++)
for (j = 0; j < 3; j++)
{
if (alpha)
a = s[i][j * bypp + bytes] / 255.0;
else
a = 1.0;
M[i][j] += a * s[i][j * bypp + b];
}
}
Nx = M[0][0] + M[1][0] + M[2][0] - M[0][2] - M[1][2] - M[2][2];
Ny = M[2][0] + M[2][1] + M[2][2] - M[0][0] - M[0][1] - M[0][2];
/* 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++ = s[1][bypp + bytes]; /* preserve the alpha */
texture++;
}
}
else
{
for (b = 0; b < bytes; b++)
*dst++ = shade;
if (alpha)
*dst++ = s[1][bypp + bytes]; /* preserve the alpha */
}
for (i = 0; i < 3; i++)
s[i] += bypp;
}
if (texture)
texture += bypp;
}
static void
emboss (GimpDrawable *drawable,
GimpPreview *preview)
{
GimpPixelRgn src, dst;
gint p_update;
gint y;
gint x1, y1, x2, y2;
gint width, height;
gint bypp, rowsize;
gboolean has_alpha;
guchar *srcbuf, *dstbuf;
if (preview)
{
gimp_preview_get_position (preview, &x1, &y1);
gimp_preview_get_size (preview, &width, &height);
x2 = x1 + width;
y2 = y1 + height;
}
else
{
if (! gimp_drawable_mask_intersect (drawable->drawable_id,
&x1, &y1, &width, &height))
return;
/* expand the bounds a little */
x1 = MAX (0, x1 - evals.depth);
y1 = MAX (0, y1 - evals.depth);
x2 = MIN (drawable->width, x1 + width + evals.depth);
y2 = MIN (drawable->height, y1 + height + evals.depth);
width = x2 - x1;
height = y2 - y1;
}
bypp = drawable->bpp;
p_update = MAX (1, height / 20);
rowsize = width * bypp;
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
gimp_pixel_rgn_init (&src, drawable,
x1, y1, width, height,
FALSE, FALSE);
gimp_pixel_rgn_init (&dst, drawable,
x1, y1, width, height,
preview == NULL, TRUE);
srcbuf = g_new0 (guchar, rowsize * 3);
dstbuf = g_new0 (guchar, rowsize);
emboss_init (DtoR(evals.azimuth), DtoR(evals.elevation), evals.depth);
if (!preview)
gimp_progress_init (_("Emboss"));
/* first row */
gimp_pixel_rgn_get_rect (&src, srcbuf, x1, y1, width, 3);
memcpy (srcbuf, srcbuf + rowsize, rowsize);
emboss_row (srcbuf, evals.embossp ? NULL : srcbuf,
dstbuf, width, bypp, has_alpha);
gimp_pixel_rgn_set_row (&dst, dstbuf, 0, 0, width);
/* middle rows */
for (y = 0; y < height - 2; y++)
{
if (! preview && (y % p_update == 0))
gimp_progress_update ((gdouble) y / (gdouble) height);
gimp_pixel_rgn_get_rect (&src, srcbuf, x1, y1 + y, width, 3);
emboss_row (srcbuf, evals.embossp ? NULL : srcbuf,
dstbuf, width, bypp, has_alpha);
gimp_pixel_rgn_set_row (&dst, dstbuf, x1, y1 + y + 1, width);
}
/* last row */
gimp_pixel_rgn_get_rect (&src, srcbuf, x1, y2 - 3, width, 3);
memcpy (srcbuf + rowsize * 2, srcbuf + rowsize, rowsize);
emboss_row (srcbuf, evals.embossp ? NULL : srcbuf,
dstbuf, width, bypp, has_alpha);
gimp_pixel_rgn_set_row (&dst, dstbuf, x1, y2 - 1, width);
if (preview)
{
gimp_drawable_preview_draw_region (GIMP_DRAWABLE_PREVIEW (preview),
&dst);
}
else
{
gimp_progress_update (1.0);
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, width, height);
gimp_displays_flush ();
}
g_free (srcbuf);
g_free (dstbuf);
}
static gboolean
emboss_dialog (GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *radio1;
GtkWidget *radio2;
GtkWidget *frame;
GtkWidget *table;
GtkObject *adj;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, TRUE);
dialog = gimp_dialog_new (_("Emboss"), PLUG_IN_ROLE,
NULL, 0,
gimp_standard_help_func, PLUG_IN_PROC,
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
gtk_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
gimp_window_set_transient (GTK_WINDOW (dialog));
main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
main_vbox, TRUE, TRUE, 0);
gtk_widget_show (main_vbox);
preview = gimp_drawable_preview_new_from_drawable_id (drawable->drawable_id);
gtk_box_pack_start (GTK_BOX (main_vbox), preview, TRUE, TRUE, 0);
gtk_widget_show (preview);
g_signal_connect_swapped (preview, "invalidated",
G_CALLBACK (emboss),
drawable);
frame = gimp_int_radio_group_new (TRUE, _("Function"),
G_CALLBACK (gimp_radio_button_update),
&evals.embossp, evals.embossp,
_("_Bumpmap"), FUNCTION_BUMPMAP, &radio1,
_("_Emboss"), FUNCTION_EMBOSS, &radio2,
NULL);
gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
g_signal_connect_swapped (radio1, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
g_signal_connect_swapped (radio2, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
table = gtk_table_new (3, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_table_set_row_spacings (GTK_TABLE (table), 6);
gtk_box_pack_start (GTK_BOX (main_vbox), table, FALSE, FALSE, 0);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("_Azimuth:"), 100, 6,
evals.azimuth, 0.0, 360.0, 1.0, 10.0, 2,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&evals.azimuth);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("E_levation:"), 100, 6,
evals.elevation, 0.0, 180.0, 1.0, 10.0, 2,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&evals.elevation);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 2,
_("_Depth:"), 100, 6,
evals.depth, 1.0, 100.0, 1.0, 5.0, 0,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_int_adjustment_update),
&evals.depth);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_widget_show (table);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
if (run)
emboss (drawable, NULL);
return run;
}
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