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gimp/plug-ins/common/engrave.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
* Copyright (C) 1997 Eiichi Takamori
* Copyright (C) 1996, 1997 Torsten Martinsen
*
* 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 <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
/* Some useful macros */
#define PLUG_IN_PROC "plug-in-engrave"
#define PLUG_IN_BINARY "engrave"
#define SCALE_WIDTH 125
#define TILE_CACHE_SIZE 16
typedef struct
{
gint height;
gboolean limit;
} EngraveValues;
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static gboolean engrave_dialog (GimpDrawable *drawable);
static void engrave (GimpDrawable *drawable,
GimpPreview *preview);
#if 0
static void engrave_large (GimpDrawable *drawable,
gint height,
gboolean limit,
GimpPreview *preview);
#endif
static void engrave_small (GimpDrawable *drawable,
gint height,
gboolean limit,
gint tile_width,
GimpPreview *preview);
static void engrave_sub (gint height,
gboolean limit,
gint bpp,
gint color_n);
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static EngraveValues pvals =
{
10, /* height */
FALSE /* limit */
};
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", "Input image (unused)" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
{ GIMP_PDB_INT32, "height", "Resolution in pixels" },
{ GIMP_PDB_INT32, "limit", "Limit line width { TRUE, FALSE }" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Simulate an antique engraving"),
"Creates a black-and-white 'engraved' version of an image as seen in old illustrations",
"Spencer Kimball & Peter Mattis, Eiichi Takamori, Torsten Martinsen",
"Spencer Kimball & Peter Mattis, Eiichi Takamori, Torsten Martinsen",
"1995,1996,1997",
N_("En_grave..."),
"RGBA, GRAYA",
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 nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpDrawable *drawable;
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
run_mode = param[0].data.d_int32;
INIT_I18N ();
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
/* Get the specified drawable */
drawable = gimp_drawable_get (param[2].data.d_drawable);
gimp_tile_cache_ntiles (TILE_CACHE_SIZE);
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &pvals);
/* First acquire information with a dialog */
if (!engrave_dialog (drawable))
{
gimp_drawable_detach (drawable);
return;
}
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 5)
status = GIMP_PDB_CALLING_ERROR;
if (status == GIMP_PDB_SUCCESS)
{
pvals.height = param[3].data.d_int32;
pvals.limit = (param[4].data.d_int32) ? TRUE : FALSE;
}
if ((status == GIMP_PDB_SUCCESS) &&
pvals.height < 0)
status = GIMP_PDB_CALLING_ERROR;
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &pvals);
break;
default:
break;
}
if (status == GIMP_PDB_SUCCESS)
{
gimp_progress_init (_("Engraving"));
engrave (drawable, NULL);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PLUG_IN_PROC, &pvals, sizeof (EngraveValues));
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static gboolean
engrave_dialog (GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *table;
GtkWidget *toggle;
GtkObject *adj;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, FALSE);
dialog = gimp_dialog_new (_("Engrave"), PLUG_IN_BINARY,
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_vbox_new (FALSE, 12);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);
gtk_container_add (GTK_CONTAINER (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
main_vbox);
gtk_widget_show (main_vbox);
preview = gimp_drawable_preview_new (drawable, NULL);
gtk_box_pack_start (GTK_BOX (main_vbox), preview, TRUE, TRUE, 0);
gtk_widget_show (preview);
g_signal_connect_swapped (preview, "invalidated",
G_CALLBACK (engrave),
drawable);
table = gtk_table_new (1, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_box_pack_start (GTK_BOX (main_vbox), table, FALSE, FALSE, 0);
gtk_widget_show (table);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("_Height:"), SCALE_WIDTH, 0,
pvals.height, 2.0, 16.0, 1.0, 4.0, 0,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_int_adjustment_update),
&pvals.height);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
toggle = gtk_check_button_new_with_mnemonic (_("_Limit line width"));
gtk_box_pack_start (GTK_BOX (main_vbox), toggle, FALSE, FALSE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), pvals.limit);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&pvals.limit);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
/* Engrave interface functions */
static void
engrave (GimpDrawable *drawable,
GimpPreview *preview)
{
gint tile_width;
gint height;
gboolean limit;
tile_width = gimp_tile_width();
height = pvals.height;
limit = pvals.limit;
/* [DindinX] this test is always false since
* tile_width == 64 and height <= 16 */
#if 0
if (height >= tile_width)
engrave_large (drawable, height, limit, preview);
else
#endif
engrave_small (drawable, height, limit, tile_width, preview);
}
#if 0
static void
engrave_large (GimpDrawable *drawable,
gint height,
gboolean limit,
GimpPreview *preview)
{
GimpPixelRgn src_rgn, dest_rgn;
guchar *src_row, *dest_row;
guchar *src, *dest;
gulong *average;
gint row, col, b, bpp;
gint x, y, y_step, inten, v;
gulong count;
gint x1, y1, x2, y2;
gint progress, max_progress;
gpointer pr;
gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
bpp = (gimp_drawable_is_rgb (drawable->drawable_id)) ? 3 : 1;
average = g_new (gulong, bpp);
/* Initialize progress */
progress = 0;
max_progress = 2 * (x2 - x1) * (y2 - y1);
for (y = y1; y < y2; y += height - (y % height))
{
for (x = x1; x < x2; ++x)
{
y_step = height - (y % height);
y_step = MIN (y_step, x2 - x);
gimp_pixel_rgn_init (&src_rgn, drawable, x, y, 1, y_step,
FALSE, FALSE);
for (b = 0; b < bpp; b++)
average[b] = 0;
count = 0;
for (pr = gimp_pixel_rgns_register (1, &src_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process(pr))
{
src_row = src_rgn.data;
for (row = 0; row < src_rgn.h; row++)
{
src = src_row;
for (col = 0; col < src_rgn.w; col++)
{
for (b = 0; b < bpp; b++)
average[b] += src[b];
src += src_rgn.bpp;
count += 1;
}
src_row += src_rgn.rowstride;
}
/* Update progress */
progress += src_rgn.w * src_rgn.h;
gimp_progress_update ((double) progress / (double) max_progress);
}
if (count > 0)
for (b = 0; b < bpp; b++)
average[b] = (guchar) (average[b] / count);
if (bpp < 3)
inten = average[0] / 254.0 * height;
else
inten = GIMP_RGB_LUMINANCE (average[0],
average[1],
average[2]) / 254.0 * height;
gimp_pixel_rgn_init (&dest_rgn,
drawable, x, y, 1, y_step, TRUE, TRUE);
for (pr = gimp_pixel_rgns_register (1, &dest_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process(pr))
{
dest_row = dest_rgn.data;
for (row = 0; row < dest_rgn.h; row++)
{
dest = dest_row;
v = inten > row ? 255 : 0;
if (limit)
{
if (row == 0)
v = 255;
else if (row == height-1)
v = 0;
}
for (b = 0; b < bpp; b++)
dest[b] = v;
dest_row += dest_rgn.rowstride;
}
/* Update progress */
progress += dest_rgn.w * dest_rgn.h;
gimp_progress_update((double) progress / (double) max_progress);
}
}
}
g_free (average);
/* update the engraved region */
gimp_drawable_flush( drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, x2 - x1, y2 - y1);
}
#endif
typedef struct
{
gint x, y, h;
gint width;
guchar *data;
} PixelArea;
static PixelArea area;
static void
engrave_small (GimpDrawable *drawable,
gint line_height,
gboolean limit,
gint tile_width,
GimpPreview *preview)
{
GimpPixelRgn src_rgn, dest_rgn;
gint bpp, color_n;
gint x1, y1, x2, y2;
gint width, height;
gint progress, max_progress;
/*
For speed efficiency, operates on PixelAreas, whose each width and
height are less than tile size.
If both ends of area cannot be divided by line_height ( as
x1%line_height != 0 etc.), operates on the remainder pixels.
*/
if (preview)
{
gimp_preview_get_position (preview, &x1, &y1);
gimp_preview_get_size (preview, &width, &height);
x2 = x1 + width;
y2 = y1 + height;
}
else
{
gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
width = x2 - x1;
height = y2 - y1;
}
gimp_pixel_rgn_init (&src_rgn, drawable,
x1, y1, width, height, FALSE, FALSE);
gimp_pixel_rgn_init (&dest_rgn, drawable,
x1, y1, width, height, (preview == NULL), TRUE);
/* Initialize progress */
progress = 0;
max_progress = width * height;
bpp = drawable->bpp;
color_n = (gimp_drawable_is_rgb (drawable->drawable_id)) ? 3 : 1;
area.width = (tile_width / line_height) * line_height;
area.data = g_new(guchar, (glong) bpp * area.width * area.width);
for (area.y = y1; area.y < y2;
area.y += area.width - (area.y % area.width))
{
area.h = area.width - (area.y % area.width);
area.h = MIN(area.h, y2 - area.y);
for (area.x = x1; area.x < x2; ++area.x)
{
gimp_pixel_rgn_get_rect (&src_rgn, area.data, area.x, area.y, 1,
area.h);
engrave_sub (line_height, limit, bpp, color_n);
gimp_pixel_rgn_set_rect (&dest_rgn, area.data,
area.x, area.y, 1, area.h);
}
if (!preview)
{
/* Update progress */
progress += area.h * width;
gimp_progress_update ((double) progress / (double) max_progress);
}
}
g_free(area.data);
/* update the engraved region */
if (preview)
{
gimp_drawable_preview_draw_region (GIMP_DRAWABLE_PREVIEW (preview),
&dest_rgn);
}
else
{
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, x2 - x1, y2 - y1);
}
}
static void
engrave_sub (gint height,
gint limit,
gint bpp,
gint color_n)
{
glong average[3]; /* color_n <= 3 */
gint y, h, inten, v;
guchar *buf_row, *buf;
gint row;
gint rowstride;
gint count;
gint i;
/*
Since there's so many nested FOR's,
put a few of them here...
*/
rowstride = bpp;
for (y = area.y; y < area.y + area.h; y += height - (y % height))
{
h = height - (y % height);
h = MIN(h, area.y + area.h - y);
for (i = 0; i < color_n; i++)
average[i] = 0;
count = 0;
/* Read */
buf_row = area.data + (y - area.y) * rowstride;
for (row = 0; row < h; row++)
{
buf = buf_row;
for (i = 0; i < color_n; i++)
average[i] += buf[i];
count++;
buf_row += rowstride;
}
/* Average */
if (count > 0)
for (i = 0; i < color_n; i++)
average[i] /= count;
if (bpp < 3)
inten = average[0] / 254.0 * height;
else
inten = GIMP_RGB_LUMINANCE (average[0],
average[1],
average[2]) / 254.0 * height;
/* Write */
buf_row = area.data + (y - area.y) * rowstride;
for (row = 0; row < h; row++)
{
buf = buf_row;
v = inten > row ? 255 : 0;
if (limit)
{
if (row == 0)
v = 255;
else if (row == height-1)
v = 0;
}
for (i = 0; i < color_n; i++)
buf[i] = v;
buf_row += rowstride;
}
}
}
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