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gimp/plug-ins/common/blinds.c

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/*
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This is a plug-in for GIMP.
*
* Blinds plug-in. Distort an image as though it was stuck to
* window blinds and the blinds where opened/closed.
*
* Copyright (C) 1997 Andy Thomas alt@picnic.demon.co.uk
*
* 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 <https://www.gnu.org/licenses/>.
*
* A fair proportion of this code was taken from the Whirl plug-in
* which was copyrighted by Federico Mena Quintero (as below).
*
* Whirl plug-in --- distort an image into a whirlpool
* Copyright (C) 1997 Federico Mena Quintero
*
*/
#include "config.h"
#include <string.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
/***** Magic numbers *****/
#define PLUG_IN_PROC "plug-in-blinds"
#define PLUG_IN_BINARY "blinds"
#define PLUG_IN_ROLE "gimp-blinds"
#define MAX_FANS 100
/* Variables set in dialog box */
typedef struct data
{
gint angledsp;
gint numsegs;
GimpOrientationType orientation;
gboolean bg_trans;
} BlindVals;
typedef struct _Blinds Blinds;
typedef struct _BlindsClass BlindsClass;
struct _Blinds
{
GimpPlugIn parent_instance;
};
struct _BlindsClass
{
GimpPlugInClass parent_class;
};
#define BLINDS_TYPE (blinds_get_type ())
#define BLINDS (obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), BLINDS_TYPE, Blinds))
GType blinds_get_type (void) G_GNUC_CONST;
static GList * blinds_query_procedures (GimpPlugIn *plug_in);
static GimpProcedure * blinds_create_procedure (GimpPlugIn *plug_in,
const gchar *name);
static GimpValueArray * blinds_run (GimpProcedure *procedure,
GimpRunMode run_mode,
GimpImage *image,
gint n_drawables,
GimpDrawable **drawables,
const GimpValueArray *args,
gpointer run_data);
static gboolean blinds_dialog (GimpDrawable *drawable);
static void blinds_scale_entry_update_int (GimpLabelSpin *entry,
gint *value);
static void dialog_update_preview (GimpDrawable *drawable,
GimpPreview *preview);
static void apply_blinds (GimpDrawable *drawable);
G_DEFINE_TYPE (Blinds, blinds, GIMP_TYPE_PLUG_IN)
GIMP_MAIN (BLINDS_TYPE)
DEFINE_STD_SET_I18N
/* Array to hold each size of fans. And no there are not each the
* same size (rounding errors...)
*/
static gint fanwidths[MAX_FANS];
/* Values when first invoked */
static BlindVals bvals =
{
30,
3,
GIMP_ORIENTATION_HORIZONTAL,
FALSE
};
static void
blinds_class_init (BlindsClass *klass)
{
GimpPlugInClass *plug_in_class = GIMP_PLUG_IN_CLASS (klass);
plug_in_class->query_procedures = blinds_query_procedures;
plug_in_class->create_procedure = blinds_create_procedure;
plug_in_class->set_i18n = STD_SET_I18N;
}
static void
blinds_init (Blinds *blinds)
{
}
static GList *
blinds_query_procedures (GimpPlugIn *plug_in)
{
return g_list_append (NULL, g_strdup (PLUG_IN_PROC));
}
static GimpProcedure *
blinds_create_procedure (GimpPlugIn *plug_in,
const gchar *name)
{
GimpProcedure *procedure = NULL;
if (! strcmp (name, PLUG_IN_PROC))
{
procedure = gimp_image_procedure_new (plug_in, name,
GIMP_PDB_PROC_TYPE_PLUGIN,
blinds_run, NULL, NULL);
gimp_procedure_set_image_types (procedure, "RGB*, GRAY*");
gimp_procedure_set_sensitivity_mask (procedure,
GIMP_PROCEDURE_SENSITIVE_DRAWABLE);
gimp_procedure_set_menu_label (procedure, _("_Blinds..."));
gimp_procedure_add_menu_path (procedure, "<Image>/Filters/Distorts");
gimp_procedure_set_documentation (procedure,
_("Simulate an image painted on "
"window blinds"),
"More here later",
name);
gimp_procedure_set_attribution (procedure,
"Andy Thomas",
"Andy Thomas",
"1997");
GIMP_PROC_ARG_INT (procedure, "angle-displacement",
"Angle displacement",
"Angle of Displacement",
0, 360, 30,
G_PARAM_READWRITE);
GIMP_PROC_ARG_INT (procedure, "num-segments",
"Num segments",
"Number of segments in blinds",
1, 1024, 3,
G_PARAM_READWRITE);
GIMP_PROC_ARG_ENUM (procedure, "orientation",
"Orientation",
"The orientation",
GIMP_TYPE_ORIENTATION_TYPE,
GIMP_ORIENTATION_HORIZONTAL,
G_PARAM_READWRITE);
GIMP_PROC_ARG_BOOLEAN (procedure, "bg-transparent",
"BG transparent",
"Background transparent",
FALSE,
G_PARAM_READWRITE);
}
return procedure;
}
static GimpValueArray *
blinds_run (GimpProcedure *procedure,
GimpRunMode run_mode,
GimpImage *image,
gint n_drawables,
GimpDrawable **drawables,
const GimpValueArray *args,
gpointer run_data)
{
GimpDrawable *drawable;
gegl_init (NULL, NULL);
if (n_drawables != 1)
{
GError *error = NULL;
g_set_error (&error, GIMP_PLUG_IN_ERROR, 0,
_("Procedure '%s' only works with one drawable."),
PLUG_IN_PROC);
return gimp_procedure_new_return_values (procedure,
GIMP_PDB_CALLING_ERROR,
error);
}
else
{
drawable = drawables[0];
}
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
gimp_get_data (PLUG_IN_PROC, &bvals);
if (! blinds_dialog (drawable))
return gimp_procedure_new_return_values (procedure,
GIMP_PDB_CANCEL,
NULL);
break;
case GIMP_RUN_NONINTERACTIVE:
bvals.angledsp = GIMP_VALUES_GET_INT (args, 0);
bvals.numsegs = GIMP_VALUES_GET_INT (args, 1);
bvals.orientation = GIMP_VALUES_GET_ENUM (args, 2);
bvals.bg_trans = GIMP_VALUES_GET_BOOLEAN (args, 3);
break;
case GIMP_RUN_WITH_LAST_VALS:
gimp_get_data (PLUG_IN_PROC, &bvals);
break;
default:
break;
}
if (gimp_drawable_is_rgb (drawable) ||
gimp_drawable_is_gray (drawable))
{
gimp_progress_init (_("Adding blinds"));
apply_blinds (drawable);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PLUG_IN_PROC, &bvals, sizeof (BlindVals));
}
else
{
return gimp_procedure_new_return_values (procedure,
GIMP_PDB_EXECUTION_ERROR,
NULL);
}
return gimp_procedure_new_return_values (procedure, GIMP_PDB_SUCCESS, NULL);
}
static gboolean
blinds_dialog (GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *hbox;
GtkWidget *frame;
GtkWidget *grid;
GtkWidget *scale;
GtkWidget *toggle;
GtkWidget *horizontal;
GtkWidget *vertical;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY);
dialog = gimp_dialog_new (_("Blinds"), PLUG_IN_ROLE,
NULL, 0,
gimp_standard_help_func, PLUG_IN_PROC,
_("_Cancel"), GTK_RESPONSE_CANCEL,
_("_OK"), GTK_RESPONSE_OK,
NULL);
gimp_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_aspect_preview_new_from_drawable (drawable);
gtk_box_pack_start (GTK_BOX (main_vbox), preview, TRUE, TRUE, 0);
gtk_widget_show (preview);
g_signal_connect_swapped (preview, "invalidated",
G_CALLBACK (dialog_update_preview),
drawable);
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 12);
gtk_box_pack_start (GTK_BOX (main_vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
frame =
gimp_int_radio_group_new (TRUE, _("Orientation"),
G_CALLBACK (gimp_radio_button_update),
&bvals.orientation, NULL, bvals.orientation,
_("_Horizontal"), GIMP_ORIENTATION_HORIZONTAL,
&horizontal,
_("_Vertical"), GIMP_ORIENTATION_VERTICAL,
&vertical,
NULL);
gtk_box_pack_start (GTK_BOX (hbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
g_signal_connect_swapped (horizontal, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
g_signal_connect_swapped (vertical, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
frame = gimp_frame_new (_("Background"));
gtk_box_pack_start (GTK_BOX (hbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
toggle = gtk_check_button_new_with_mnemonic (_("_Transparent"));
gtk_container_add (GTK_CONTAINER (frame), toggle);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&bvals.bg_trans);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), bvals.bg_trans);
if (! gimp_drawable_has_alpha (drawable))
{
gtk_widget_set_sensitive (toggle, FALSE);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), FALSE);
}
grid = gtk_grid_new ();
gtk_grid_set_row_spacing (GTK_GRID (grid), 2);
gtk_grid_set_column_spacing (GTK_GRID (grid), 6);
gtk_box_pack_start (GTK_BOX (main_vbox), grid, FALSE, FALSE, 0);
gtk_widget_show (grid);
scale = gimp_scale_entry_new (_("_Displacement:"), bvals.angledsp, 1, 90, 0);
gimp_label_spin_set_increments (GIMP_LABEL_SPIN (scale), 1.0, 15.0);
g_signal_connect (scale, "value-changed",
G_CALLBACK (blinds_scale_entry_update_int),
&bvals.angledsp);
g_signal_connect_swapped (scale, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_box_pack_start (GTK_BOX (main_vbox), scale, FALSE, FALSE, 2);
gtk_widget_show (scale);
scale = gimp_scale_entry_new (_("_Number of segments:"), bvals.numsegs, 1, MAX_FANS, 0);
g_signal_connect (scale, "value-changed",
G_CALLBACK (blinds_scale_entry_update_int),
&bvals.numsegs);
g_signal_connect_swapped (scale, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_box_pack_start (GTK_BOX (main_vbox), scale, FALSE, FALSE, 2);
gtk_widget_show (scale);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
static void
blinds_scale_entry_update_int (GimpLabelSpin *entry,
gint *value)
{
*value = (gint) gimp_label_spin_get_value (entry);
}
static void
blindsapply (guchar *srow,
guchar *drow,
gint width,
gint bpp,
guchar *bg)
{
guchar *src;
guchar *dst;
gint i,j,k;
gdouble ang;
gint available;
/* Make the row 'shrink' around points along its length */
/* The bvals.numsegs determines how many segments to slip it in to */
/* The angle is the conceptual 'rotation' of each of these segments */
/* Note the row is considered to be made up of a two dim array actual
* pixel locations and the RGB color at these locations.
*/
/* In the process copy the src row to the destination row */
/* Fill in with background color ? */
for (i = 0 ; i < width ; i++)
{
dst = &drow[i*bpp];
for (j = 0 ; j < bpp; j++)
{
dst[j] = bg[j];
}
}
/* Apply it */
available = width;
for (i = 0; i < bvals.numsegs; i++)
{
/* Width of segs are variable */
fanwidths[i] = available / (bvals.numsegs - i);
available -= fanwidths[i];
}
/* do center points first - just for fun...*/
available = 0;
for (k = 1; k <= bvals.numsegs; k++)
{
int point;
point = available + fanwidths[k - 1] / 2;
available += fanwidths[k - 1];
src = &srow[point * bpp];
dst = &drow[point * bpp];
/* Copy pixels across */
for (j = 0 ; j < bpp; j++)
{
dst[j] = src[j];
}
}
/* Disp for each point */
ang = (bvals.angledsp * 2 * G_PI) / 360; /* Angle in rads */
ang = (1 - fabs (cos (ang)));
available = 0;
for (k = 0 ; k < bvals.numsegs; k++)
{
int dx; /* Amount to move by */
int fw;
for (i = 0 ; i < (fanwidths[k]/2) ; i++)
{
/* Copy pixels across of left half of fan */
fw = fanwidths[k] / 2;
dx = (int) (ang * ((double) (fw - (double)(i % fw))));
src = &srow[(available + i) * bpp];
dst = &drow[(available + i + dx) * bpp];
for (j = 0; j < bpp; j++)
{
dst[j] = src[j];
}
/* Right side */
j = i + 1;
src = &srow[(available + fanwidths[k] - j
- (fanwidths[k] % 2)) * bpp];
dst = &drow[(available + fanwidths[k] - j
- (fanwidths[k] % 2) - dx) * bpp];
for (j = 0; j < bpp; j++)
{
dst[j] = src[j];
}
}
available += fanwidths[k];
}
}
static void
dialog_update_preview (GimpDrawable *drawable,
GimpPreview *preview)
{
gint y;
guchar *p, *buffer, *cache;
GimpRGB background;
guchar bg[4];
gint width, height, bpp;
gimp_preview_get_size (preview, &width, &height);
cache = gimp_drawable_get_thumbnail_data (drawable,
&width, &height, &bpp);
p = cache;
gimp_context_get_background (&background);
if (bvals.bg_trans)
gimp_rgb_set_alpha (&background, 0.0);
if (gimp_drawable_is_gray (drawable))
{
bg[0] = gimp_rgb_luminance_uchar (&background);
gimp_rgba_get_uchar (&background, NULL, NULL, NULL, bg + 3);
}
else
{
gimp_rgba_get_uchar (&background, bg, bg + 1, bg + 2, bg + 3);
}
buffer = g_new (guchar, width * height * bpp);
if (bvals.orientation == GIMP_ORIENTATION_VERTICAL)
{
for (y = 0; y < height; y++)
{
blindsapply (p,
buffer + y * width * bpp,
width,
bpp, bg);
p += width * bpp;
}
}
else
{
/* Horizontal blinds */
/* Apply the blinds algo to a single column -
* this act as a transformation matrix for the
* rows. Make row 0 invalid so we can find it again!
*/
gint i;
guchar *sr = g_new (guchar, height * 4);
guchar *dr = g_new0 (guchar, height * 4);
guchar dummybg[4] = {0, 0, 0, 0};
/* Fill in with background color ? */
for (i = 0 ; i < width ; i++)
{
gint j;
gint bd = bpp;
guchar *dst;
dst = &buffer[i * bd];
for (j = 0 ; j < bd; j++)
{
dst[j] = bg[j];
}
}
for ( y = 0 ; y < height; y++)
{
sr[y] = y+1;
}
/* Bit of a fiddle since blindsapply really works on an image
* row not a set of bytes. - preview can't be > 255
* or must make dr sr int rows.
*/
blindsapply (sr, dr, height, 1, dummybg);
for (y = 0; y < height; y++)
{
if (dr[y] == 0)
{
/* Draw background line */
p = buffer;
}
else
{
/* Draw line from src */
p = cache +
(width * bpp * (dr[y] - 1));
}
memcpy (buffer + y * width * bpp,
p,
width * bpp);
}
g_free (sr);
g_free (dr);
}
gimp_preview_draw_buffer (preview, buffer, width * bpp);
g_free (buffer);
g_free (cache);
}
/* STEP tells us how many rows/columns to gulp down in one go... */
/* Note all the "4" literals around here are to do with the depths
* of the images. Makes it easier to deal with for my small brain.
*/
#define STEP 40
static void
apply_blinds (GimpDrawable *drawable)
{
GeglBuffer *src_buffer;
GeglBuffer *dest_buffer;
const Babl *format;
guchar *src_rows, *des_rows;
gint bytes;
gint x, y;
GimpRGB background;
guchar bg[4];
gint sel_x1, sel_y1;
gint sel_width, sel_height;
gimp_context_get_background (&background);
if (bvals.bg_trans)
gimp_rgb_set_alpha (&background, 0.0);
gimp_rgba_get_uchar (&background, bg, bg + 1, bg + 2, bg + 3);
if (! gimp_drawable_mask_intersect (drawable,
&sel_x1, &sel_y1,
&sel_width, &sel_height))
return;
if (gimp_drawable_has_alpha (drawable))
format = babl_format ("R'G'B'A u8");
else
format = babl_format ("R'G'B' u8");
bytes = babl_format_get_bytes_per_pixel (format);
src_buffer = gimp_drawable_get_buffer (drawable);
dest_buffer = gimp_drawable_get_shadow_buffer (drawable);
src_rows = g_new (guchar, MAX (sel_width, sel_height) * bytes * STEP);
des_rows = g_new (guchar, MAX (sel_width, sel_height) * bytes * STEP);
if (bvals.orientation == GIMP_ORIENTATION_VERTICAL)
{
for (y = 0; y < sel_height; y += STEP)
{
gint rr;
gint step;
if ((y + STEP) > sel_height)
step = sel_height - y;
else
step = STEP;
gegl_buffer_get (src_buffer,
GEGL_RECTANGLE (sel_x1, sel_y1 + y,
sel_width, step), 1.0,
format, src_rows,
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
/* OK I could make this better */
for (rr = 0; rr < STEP; rr++)
blindsapply (src_rows + (sel_width * rr * bytes),
des_rows + (sel_width * rr * bytes),
sel_width, bytes, bg);
gegl_buffer_set (dest_buffer,
GEGL_RECTANGLE (sel_x1, sel_y1 + y,
sel_width, step), 0,
format, des_rows,
GEGL_AUTO_ROWSTRIDE);
gimp_progress_update ((double) y / (double) sel_height);
}
}
else
{
/* Horizontal blinds */
/* Apply the blinds algo to a single column -
* this act as a transformation matrix for the
* rows. Make row 0 invalid so we can find it again!
*/
gint i;
gint *sr = g_new (gint, sel_height * bytes);
gint *dr = g_new (gint, sel_height * bytes);
guchar *dst = g_new (guchar, STEP * bytes);
guchar dummybg[4];
memset (dummybg, 0, 4);
memset (dr, 0, sel_height * bytes); /* all dr rows are background rows */
for (y = 0; y < sel_height; y++)
{
sr[y] = y+1;
}
/* Hmmm. does this work portably? */
/* This "swaps" the integers around that are held in in the
* sr & dr arrays.
*/
blindsapply ((guchar *) sr, (guchar *) dr,
sel_height, sizeof (gint), dummybg);
/* Fill in with background color ? */
for (i = 0 ; i < STEP ; i++)
{
int j;
guchar *bgdst;
bgdst = &dst[i * bytes];
for (j = 0 ; j < bytes; j++)
{
bgdst[j] = bg[j];
}
}
for (x = 0; x < sel_width; x += STEP)
{
int rr;
int step;
guchar *p;
if((x + STEP) > sel_width)
step = sel_width - x;
else
step = STEP;
gegl_buffer_get (src_buffer,
GEGL_RECTANGLE (sel_x1 + x, sel_y1,
step, sel_height), 1.0,
format, src_rows,
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
/* OK I could make this better */
for (rr = 0; rr < sel_height; rr++)
{
if(dr[rr] == 0)
{
/* Draw background line */
p = dst;
}
else
{
/* Draw line from src */
p = src_rows + (step * bytes * (dr[rr] - 1));
}
memcpy (des_rows + (rr * step * bytes), p,
step * bytes);
}
gegl_buffer_set (dest_buffer,
GEGL_RECTANGLE (sel_x1 + x, sel_y1,
step, sel_height), 0,
format, des_rows,
GEGL_AUTO_ROWSTRIDE);
gimp_progress_update ((double) x / (double) sel_width);
}
g_free (dst);
g_free (sr);
g_free (dr);
}
g_free (src_rows);
g_free (des_rows);
g_object_unref (src_buffer);
g_object_unref (dest_buffer);
gimp_progress_update (1.0);
gimp_drawable_merge_shadow (drawable, TRUE);
gimp_drawable_update (drawable,
sel_x1, sel_y1, sel_width, sel_height);
}
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