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gimp/plug-ins/common/pixelize.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* Pixelize plug-in (ported to GIMP v1.0)
* Copyright (C) 1997 Eiichi Takamori <taka@ma1.seikyou.ne.jp>
* original pixelize.c for GIMP 0.54 by Tracy Scott
*
* 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/>.
*/
/*
* version 1.04
* This version requires GIMP v0.99.10 or above.
*
* This plug-in "pixelizes" the image.
*
* Eiichi Takamori <taka@ma1.seikyou.ne.jp>
* http://ha1.seikyou.ne.jp/home/taka/gimp/
*
* Changes from version 1.03 to version 1.04:
* - Added gtk_rc_parse
* - Added entry with scale
* - Fixed bug that large pixelwidth >=64 sometimes caused core dump
*
* Changes from gimp-0.99.9/plug-ins/pixelize.c to version 1.03:
* - Fixed comments and help strings
* - Fixed `RGB, GRAY' to `RGB*, GRAY*'
* - Fixed procedure db name `pixelize' to `plug_in_pixelize'
*
* Differences from Tracy Scott's original `pixelize' plug-in:
*
* - Algorithm is modified to work around with the tile management.
* The way of pixelizing is switched by the value of pixelwidth. If
* pixelwidth is greater than (or equal to) tile width, then this
* plug-in makes GimpPixelRgn with that width and proceeds. Otherwise,
* it makes the region named `PixelArea', whose size is smaller than
* tile width and is multiply of pixel width, and acts onto it.
*/
/* pixelize filter written for GIMP
* -Tracy Scott
*
* This filter acts as a low pass filter on the color components of
* the provided region
*/
#include "config.h"
#include <string.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
/* Some useful macros */
#define PIXELIZE_PROC "plug-in-pixelize"
#define PIXELIZE2_PROC "plug-in-pixelize2"
#define PLUG_IN_BINARY "pixelize"
#define TILE_CACHE_SIZE 16
#define SCALE_WIDTH 125
#define ENTRY_WIDTH 6
typedef struct
{
gint pixelwidth;
gint pixelheight;
} PixelizeValues;
typedef struct
{
gint x, y, w, h;
gint width;
gint height;
guchar *data;
} PixelArea;
/* 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 gboolean pixelize_dialog (GimpDrawable *drawable);
static void update_pixelsize (GimpSizeEntry *sizeentry,
GimpPreview *preview);
static void pixelize (GimpDrawable *drawable,
GimpPreview *preview);
static void pixelize_large (GimpDrawable *drawable,
gint pixelwidth,
gint pixelheight,
GimpPreview *preview);
static void pixelize_small (GimpDrawable *drawable,
gint pixelwidth,
gint pixelheight,
gint tile_width,
gint tile_height);
static void pixelize_sub (gint pixelwidth,
gint pixelheight,
gint bpp,
gint has_alpha);
/***** Local vars *****/
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run /* run_proc */
};
static PixelizeValues pvals =
{
10,
10
};
static PixelArea area;
/***** Functions *****/
MAIN ()
static void
query (void)
{
static const GimpParamDef pixelize_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, "pixel-width", "Pixel width (the decrease in resolution)" }
};
static const GimpParamDef pixelize2_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, "pixel-width", "Pixel width (the decrease in horizontal resolution)" },
{ GIMP_PDB_INT32, "pixel-height", "Pixel height (the decrease in vertical resolution)" }
};
gimp_install_procedure (PIXELIZE_PROC,
N_("Simplify image into an array of solid-colored squares"),
"Pixelize the contents of the specified drawable "
"with specified pixelizing width.",
"Spencer Kimball & Peter Mattis, Tracy Scott, "
"(ported to 1.0 by) Eiichi Takamori",
"Spencer Kimball & Peter Mattis, Tracy Scott",
"1995",
N_("_Pixelize..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (pixelize_args), 0,
pixelize_args, NULL);
gimp_plugin_menu_register (PIXELIZE_PROC, "<Image>/Filters/Blur");
gimp_install_procedure (PIXELIZE2_PROC,
"Pixelize the contents of the specified drawable",
"Pixelize the contents of the specified drawable "
"with speficied pixelizing width.",
"Spencer Kimball & Peter Mattis, Tracy Scott, "
"(ported to 1.0 by) Eiichi Takamori",
"Spencer Kimball & Peter Mattis, Tracy Scott",
"2001",
NULL,
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (pixelize2_args), 0,
pixelize2_args, NULL);
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[2];
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);
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data (PIXELIZE_PROC, &pvals);
/* First acquire information with a dialog */
if (! pixelize_dialog (drawable))
{
gimp_drawable_detach (drawable);
return;
}
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if ((! strcmp (name, PIXELIZE_PROC) && nparams != 4) ||
(! strcmp (name, PIXELIZE2_PROC) && nparams != 5))
{
status = GIMP_PDB_CALLING_ERROR;
}
if (status == GIMP_PDB_SUCCESS)
{
pvals.pixelwidth = (gdouble) param[3].data.d_int32;
if (nparams == 4)
pvals.pixelheight = pvals.pixelwidth;
else
pvals.pixelheight = (gdouble) param[4].data.d_int32;
}
if ((status == GIMP_PDB_SUCCESS) &&
(pvals.pixelwidth <= 0 || pvals.pixelheight <= 0))
{
status = GIMP_PDB_CALLING_ERROR;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data (PIXELIZE_PROC, &pvals);
break;
default:
break;
}
if (status == GIMP_PDB_SUCCESS)
{
/* Make sure that the drawable is gray or RGB color */
if (gimp_drawable_is_rgb (drawable->drawable_id) ||
gimp_drawable_is_gray (drawable->drawable_id))
{
gimp_progress_init (_("Pixelizing"));
/* set the tile cache size */
gimp_tile_cache_ntiles (TILE_CACHE_SIZE);
/* run the pixelize effect */
pixelize (drawable, NULL);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PIXELIZE_PROC, &pvals, sizeof (PixelizeValues));
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
*nreturn_vals = 2;
values[1].type = GIMP_PDB_STRING;
values[1].data.d_string = _("Cannot operate on indexed color images.");
}
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static gboolean
pixelize_dialog (GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *sizeentry;
guint32 image_id;
GimpUnit unit;
gdouble xres, yres;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, FALSE);
dialog = gimp_dialog_new (_("Pixelize"), PLUG_IN_BINARY,
NULL, 0,
gimp_standard_help_func, PIXELIZE_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 (pixelize),
drawable);
image_id = gimp_drawable_get_image (drawable->drawable_id);
unit = gimp_image_get_unit (image_id);
gimp_image_get_resolution (image_id, &xres, &yres);
sizeentry = gimp_coordinates_new (unit, "%a", TRUE, TRUE, ENTRY_WIDTH,
GIMP_SIZE_ENTRY_UPDATE_SIZE,
TRUE, FALSE,
_("Pixel _width:"),
pvals.pixelwidth, xres,
1, drawable->width,
1, drawable->width,
_("Pixel _height:"),
pvals.pixelheight, yres,
1, drawable->height,
1, drawable->height);
gtk_box_pack_start (GTK_BOX (main_vbox), sizeentry, FALSE, FALSE, 0);
gtk_widget_show (sizeentry);
g_signal_connect (sizeentry, "value-changed",
G_CALLBACK (update_pixelsize),
preview);
g_signal_connect (sizeentry, "refval-changed",
G_CALLBACK (update_pixelsize),
preview);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
static void
update_pixelsize (GimpSizeEntry *sizeentry,
GimpPreview *preview)
{
pvals.pixelwidth = gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (sizeentry),
0);
pvals.pixelheight = gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (sizeentry),
1);
gimp_preview_invalidate (preview);
}
/*
Pixelize Effect
*/
static void
pixelize (GimpDrawable *drawable,
GimpPreview *preview)
{
gint tile_width;
gint tile_height;
gint pixelwidth;
gint pixelheight;
tile_width = gimp_tile_width ();
tile_height = gimp_tile_height ();
pixelwidth = pvals.pixelwidth;
pixelheight = pvals.pixelheight;
if (pixelwidth < 0)
pixelwidth = - pixelwidth;
if (pixelwidth < 1)
pixelwidth = 1;
if (pixelheight < 0)
pixelheight = - pixelheight;
if (pixelheight < 1)
pixelheight = 1;
if (pixelwidth >= tile_width || pixelheight >= tile_height || preview)
pixelize_large (drawable, pixelwidth, pixelheight, preview);
else
pixelize_small (drawable, pixelwidth, pixelheight, tile_width, tile_height);
}
/*
This function operates on the image when pixelwidth >= tile_width.
It simply sets the size of GimpPixelRgn as pixelwidth and proceeds.
*/
static void
pixelize_large (GimpDrawable *drawable,
gint pixelwidth,
gint pixelheight,
GimpPreview *preview)
{
GimpPixelRgn src_rgn, dest_rgn;
guchar *src_row, *dest_row;
guchar *src, *dest = NULL, *d;
gulong average[4];
gint row, col, b, bpp, has_alpha;
gint x, y, x_step, y_step;
gint i, j;
gulong count;
gint x1, y1, x2, y2;
gint width, height;
gint progress = 0, max_progress = 1;
gpointer pr;
bpp = gimp_drawable_bpp (drawable->drawable_id);
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
if (preview)
{
gimp_preview_get_position (preview, &x1, &y1);
gimp_preview_get_size (preview, &width, &height);
x2 = x1 + width;
y2 = y1 + height;
dest = g_new (guchar, width * height * bpp);
}
else
{
if (! gimp_drawable_mask_intersect (drawable->drawable_id,
&x1, &y1, &width, &height))
return;
x2 = x1 + width;
y2 = y1 + height;
/* Initialize progress */
progress = 0;
max_progress = 2 * width * height;
}
for (y = y1; y < y2; y += pixelheight - (y % pixelheight))
{
for (x = x1; x < x2; x += pixelwidth - (x % pixelwidth))
{
x_step = pixelwidth - (x % pixelwidth);
y_step = pixelheight - (y % pixelheight);
x_step = MIN (x_step, x2 - x);
y_step = MIN (y_step, y2 - y);
gimp_pixel_rgn_init (&src_rgn, drawable,
x, y, x_step, 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;
if (has_alpha)
{
for (col = 0; col < src_rgn.w; col++)
{
gulong alpha = src[bpp - 1];
average[bpp - 1] += alpha;
for (b = 0; b < bpp - 1; b++)
average[b] += src[b] * alpha;
src += src_rgn.bpp;
}
}
else
{
for (col = 0; col < src_rgn.w; col++)
{
for (b = 0; b < bpp; b++)
average[b] += src[b];
src += src_rgn.bpp;
}
}
src_row += src_rgn.rowstride;
}
count += src_rgn.w * src_rgn.h;
if (!preview)
{
/* Update progress */
progress += src_rgn.w * src_rgn.h;
gimp_progress_update ((gdouble) progress /
(gdouble) max_progress);
}
}
if (count > 0)
{
if (has_alpha)
{
gulong alpha = average[bpp - 1];
if ((average[bpp - 1] = alpha / count))
for (b = 0; b < bpp - 1; b++)
average[b] /= alpha;
}
else
{
for (b = 0; b < bpp; b++)
average[b] /= count;
}
}
if (preview)
{
dest_row = dest + ((y - y1) * width + (x - x1)) * bpp;
for (j = 0; j < y_step; j++)
{
d = dest_row;
for (i = 0; i < x_step; i++)
for (b = 0; b < bpp; b++)
*d++ = average[b];
dest_row += width * bpp;
}
}
else
{
gimp_pixel_rgn_init (&dest_rgn, drawable,
x, y, x_step, 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;
for (col = 0; col < dest_rgn.w; col++)
{
for (b = 0; b < bpp; b++)
dest[b] = average[b];
dest += dest_rgn.bpp;
}
dest_row += dest_rgn.rowstride;
}
/* Update progress */
progress += dest_rgn.w * dest_rgn.h;
gimp_progress_update ((gdouble) progress /
(gdouble) max_progress);
}
}
}
}
if (preview)
{
gimp_preview_draw_buffer (preview, dest, width * bpp);
g_free (dest);
}
else
{
/* update the blurred region */
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, width, height);
}
}
/*
This function operates on PixelArea, whose width and height are
multiply of pixel width, and less than the tile size (to enhance
its speed).
If any coordinates of mask boundary is not multiply of pixel width
(e.g. x1 % pixelwidth != 0), operates on the region whose width
or height is the remainder.
*/
static void
pixelize_small (GimpDrawable *drawable,
gint pixelwidth,
gint pixelheight,
gint tile_width,
gint tile_height)
{
GimpPixelRgn src_rgn, dest_rgn;
gint bpp, has_alpha;
gint x1, y1, x2, y2, w, h;
gint progress, max_progress;
if (! gimp_drawable_mask_intersect (drawable->drawable_id, &x1, &y1, &w, &h))
return;
x2 = x1 + w;
y2 = y1 + h;
gimp_pixel_rgn_init (&src_rgn, drawable, x1, y1, x2-x1, y2-y1, FALSE, FALSE);
gimp_pixel_rgn_init (&dest_rgn, drawable, x1, y1, x2-x1, y2-y1, TRUE, TRUE);
/* Initialize progress */
progress = 0;
max_progress = (x2 - x1) * (y2 - y1);
bpp = drawable->bpp;
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
area.width = (tile_width / pixelwidth) * pixelwidth;
area.height = (tile_height / pixelheight) * pixelheight;
area.data= g_new (guchar, (glong) bpp * area.width * area.height);
for (area.y = y1; area.y < y2;
area.y += area.height - (area.y % area.height))
{
area.h = area.height - (area.y % area.height);
area.h = MIN (area.h, y2 - area.y);
for (area.x = x1; area.x < x2;
area.x += area.width - (area.x % area.width))
{
area.w = area.width - (area.x % area.width);
area.w = MIN(area.w, x2 - area.x);
gimp_pixel_rgn_get_rect (&src_rgn, area.data,
area.x, area.y, area.w, area.h);
pixelize_sub (pixelwidth, pixelheight, bpp, has_alpha);
gimp_pixel_rgn_set_rect (&dest_rgn, area.data,
area.x, area.y, area.w, area.h);
/* Update progress */
progress += area.w * area.h;
gimp_progress_update ((double) progress / (double) max_progress);
}
}
g_free(area.data);
/* update the pixelized 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));
}
/*
This function acts on one PixelArea. Since there were so many
nested FORs in pixelize_small(), I put a few of them here...
*/
static void
pixelize_sub (gint pixelwidth,
gint pixelheight,
gint bpp,
gint has_alpha)
{
gulong average[4]; /* bpp <= 4 */
gint x, y, w, h;
guchar *buf_row, *buf;
gint row, col;
gint rowstride;
gint count;
gint i;
rowstride = area.w * bpp;
for (y = area.y; y < area.y + area.h; y += pixelheight - (y % pixelheight))
{
h = pixelheight - (y % pixelheight);
h = MIN (h, area.y + area.h - y);
for (x = area.x; x < area.x + area.w; x += pixelwidth - (x % pixelwidth))
{
w = pixelwidth - (x % pixelwidth);
w = MIN (w, area.x + area.w - x);
for (i = 0; i < bpp; i++)
average[i] = 0;
count = 0;
/* Read */
buf_row = area.data + (y-area.y)*rowstride + (x-area.x)*bpp;
for (row = 0; row < h; row++)
{
buf = buf_row;
if (has_alpha)
{
for (col = 0; col < w; col++)
{
gulong alpha = buf[bpp-1];
average[bpp-1] += alpha;
for (i = 0; i < bpp-1; i++)
average[i] += buf[i] * alpha;
buf += bpp;
}
}
else
{
for (col = 0; col < w; col++)
{
for (i = 0; i < bpp; i++)
average[i] += buf[i];
buf += bpp;
}
}
buf_row += rowstride;
}
count += w * h;
/* Average */
if (count > 0)
{
if (has_alpha)
{
gulong alpha = average[bpp-1];
if ((average[bpp-1] = alpha / count))
{
for (i = 0; i < bpp-1; i++)
average[i] /= alpha;
}
}
else
{
for (i = 0; i < bpp; i++)
average[i] /= count;
}
}
/* Write */
buf_row = area.data + (y-area.y)*rowstride + (x-area.x)*bpp;
for (row = 0; row < h; row++)
{
buf = buf_row;
for (col = 0; col < w; col++)
{
for (i = 0; i < bpp; i++)
buf[i] = average[i];
count++;
buf += bpp;
}
buf_row += rowstride;
}
}
}
}
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