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gimp/plug-ins/common/color-cube-analyze.c

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/*
* This is a plug-in for GIMP.
*
* 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/>.
*
*/
/*
* Analyze colorcube.
*
* Author: robert@experimental.net
*/
#include "config.h"
#include <string.h>
#include <glib/gstdio.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_PROC "plug-in-ccanalyze"
#define PLUG_IN_BINARY "color-cube-analyze"
#define PLUG_IN_ROLE "gimp-color-cube-analyze"
/* size of histogram image */
#define PREWIDTH 256
#define PREHEIGHT 150
/* lets prototype */
static void query (void);
static void run (const gchar *name,
gint n_params,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void doDialog (void);
static void analyze (GimpDrawable *drawable);
static void histogram (guchar r,
guchar g,
guchar b,
gdouble a);
static void fillPreview (GtkWidget *preview);
static void insertcolor (guchar r,
guchar g,
guchar b,
gdouble a);
static void doLabel (GtkWidget *table,
const char *format,
...) G_GNUC_PRINTF (2, 3);
/* some global variables */
static gint width, height, bpp;
static gdouble hist_red[256], hist_green[256], hist_blue[256];
static gdouble maxred = 0.0, maxgreen = 0.0, maxblue = 0.0;
static gint uniques = 0;
static gint32 imageID;
/* lets declare what we want to do */
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
/* run program */
MAIN ()
/* tell GIMP who we are */
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" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" }
};
static const GimpParamDef return_vals[] =
{
{ GIMP_PDB_INT32, "num-colors", "Number of colors in the image" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Analyze the set of colors in the image"),
"Analyze colorcube and print some information about "
"the current image (also displays a color-histogram)",
"robert@experimental.net",
"robert@experimental.net",
"June 20th, 1997",
N_("Colorcube A_nalysis..."),
"RGB*, GRAY*, INDEXED*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), G_N_ELEMENTS (return_vals),
args, return_vals);
gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Colors/Info");
}
/* main function */
static void
run (const gchar *name,
gint n_params,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[2];
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
GimpDrawable *drawable;
run_mode = param[0].data.d_int32;
INIT_I18N ();
*nreturn_vals = 2;
*return_vals = values;
if (run_mode == GIMP_RUN_NONINTERACTIVE)
{
if (n_params != 3)
status = GIMP_PDB_CALLING_ERROR;
}
if (status == GIMP_PDB_SUCCESS)
{
drawable = gimp_drawable_get (param[2].data.d_drawable);
imageID = param[1].data.d_image;
if (gimp_drawable_is_rgb (drawable->drawable_id) ||
gimp_drawable_is_gray (drawable->drawable_id) ||
gimp_drawable_is_indexed (drawable->drawable_id))
{
memset (hist_red, 0, sizeof (hist_red));
memset (hist_green, 0, sizeof (hist_green));
memset (hist_blue, 0, sizeof (hist_blue));
gimp_tile_cache_ntiles (2 *
(drawable->width / gimp_tile_width () + 1));
analyze (drawable);
/* show dialog after we analyzed image */
if (run_mode != GIMP_RUN_NONINTERACTIVE)
doDialog ();
}
else
status = GIMP_PDB_EXECUTION_ERROR;
gimp_drawable_detach (drawable);
}
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
values[1].type = GIMP_PDB_INT32;
values[1].data.d_int32 = uniques;
}
/* do the analyzing */
static void
analyze (GimpDrawable *drawable)
{
GimpPixelRgn srcPR;
guchar *src_row, *cmap;
gint x, y, numcol;
gint x1, y1, x2, y2, w, h;
guchar r, g, b;
gint a;
guchar idx;
gboolean gray;
gboolean has_alpha;
gboolean has_sel;
guchar *sel;
GimpPixelRgn selPR;
gint ofsx, ofsy;
GimpDrawable *selDrawable;
gimp_progress_init (_("Colorcube Analysis"));
if (! gimp_drawable_mask_intersect (drawable->drawable_id, &x1, &y1, &w, &h))
return;
x2 = x1 + w;
y2 = y1 + h;
/*
* Get the size of the input image (this will/must be the same
* as the size of the output image).
*/
width = drawable->width;
height = drawable->height;
bpp = drawable->bpp;
has_sel = !gimp_selection_is_empty (imageID);
gimp_drawable_offsets (drawable->drawable_id, &ofsx, &ofsy);
/* initialize the pixel region */
gimp_pixel_rgn_init (&srcPR, drawable, 0, 0, width, height, FALSE, FALSE);
cmap = gimp_image_get_colormap (imageID, &numcol);
gray = (gimp_drawable_is_gray (drawable->drawable_id) ||
gimp_item_is_channel (drawable->drawable_id));
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
selDrawable = gimp_drawable_get (gimp_image_get_selection (imageID));
gimp_pixel_rgn_init (&selPR,
selDrawable,
0, 0, width, height, FALSE, FALSE);
/* allocate row buffer */
src_row = g_new (guchar, (x2 - x1) * bpp);
sel = g_new (guchar, x2 - x1);
for (y = y1; y < y2; y++)
{
gimp_pixel_rgn_get_row (&srcPR, src_row, x1, y, (x2 - x1));
if (has_sel)
gimp_pixel_rgn_get_row (&selPR, sel, x1 + ofsx, y + ofsy, (x2 - x1));
for (x = 0; x < w; x++)
{
/* Start with full opacity. */
a = 255;
/*
* If the image is indexed, fetch RGB values
* from colormap.
*/
if (cmap)
{
idx = src_row[x * bpp];
r = cmap[idx * 3];
g = cmap[idx * 3 + 1];
b = cmap[idx * 3 + 2];
if (has_alpha)
a = src_row[x * bpp + 1];
}
else if (gray)
{
r = g = b = src_row[x * bpp];
if (has_alpha)
a = src_row[x * bpp + 1];
}
else
{
r = src_row[x * bpp];
g = src_row[x * bpp + 1];
b = src_row[x * bpp + 2];
if (has_alpha)
a = src_row[x * bpp + 3];
}
if (has_sel)
a *= sel[x];
else
a *= 255;
if (a != 0)
insertcolor (r, g, b, (gdouble) a * (1.0 / (255.0 * 255.0)));
}
/* tell the user what we're doing */
if ((y % 10) == 0)
gimp_progress_update ((gdouble) y / (gdouble) (y2 - y1));
}
gimp_progress_update (1.0);
/* clean up */
gimp_drawable_detach (selDrawable);
g_free (src_row);
g_free (sel);
}
static void
insertcolor (guchar r,
guchar g,
guchar b,
gdouble a)
{
static GHashTable *hash_table;
guint key;
if (!hash_table)
hash_table = g_hash_table_new (g_direct_hash, g_direct_equal);
histogram (r, g, b, a);
key = r + 256 * (g + 256 * b);
if (g_hash_table_lookup (hash_table, GINT_TO_POINTER (key)))
{
return;
}
g_hash_table_insert (hash_table, GINT_TO_POINTER (key),
GINT_TO_POINTER (1));
uniques++;
}
/*
* Update RGB count, and keep track of maximum values (which aren't used
* anywhere as of yet, but they might be useful sometime).
*/
static void
histogram (guchar r,
guchar g,
guchar b,
gdouble a)
{
hist_red[r] += a;
hist_green[g] += a;
hist_blue[b] += a;
if (hist_red[r] > maxred)
maxred = hist_red[r];
if (hist_green[g] > maxgreen)
maxgreen = hist_green[g];
if (hist_blue[b] > maxblue)
maxblue = hist_blue[b];
}
/* show our results */
static void
doDialog (void)
{
GtkWidget *dialog;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *frame;
GtkWidget *preview;
gimp_ui_init (PLUG_IN_BINARY, TRUE);
dialog = gimp_dialog_new (_("Colorcube Analysis"), PLUG_IN_ROLE,
NULL, 0,
gimp_standard_help_func, PLUG_IN_PROC,
_("_Close"), GTK_RESPONSE_CLOSE,
NULL);
gimp_window_set_transient (GTK_WINDOW (dialog));
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 12);
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
vbox, TRUE, TRUE, 0);
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (hbox), frame, FALSE, FALSE, 0);
/* use preview for histogram window */
preview = gimp_preview_area_new ();
gtk_widget_set_size_request (preview, PREWIDTH, PREHEIGHT);
gtk_container_add (GTK_CONTAINER (frame), preview);
/* output results */
doLabel (vbox, _("Image dimensions: %d × %d"), width, height);
if (uniques == 0)
doLabel (vbox, _("No colors"));
else if (uniques == 1)
doLabel (vbox, _("Only one unique color"));
else
doLabel (vbox, _("Number of unique colors: %d"), uniques);
/* show stuff */
gtk_widget_show_all (dialog);
fillPreview (preview);
gimp_dialog_run (GIMP_DIALOG (dialog));
gtk_widget_destroy (dialog);
}
/* shortcut */
static void
doLabel (GtkWidget *vbox,
const gchar *format,
...)
{
GtkWidget *label;
gchar *text;
va_list args;
va_start (args, format);
text = g_strdup_vprintf (format, args);
va_end (args);
label = gtk_label_new (text);
gtk_label_set_xalign (GTK_LABEL (label), 0.0);
gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
g_free (text);
}
/* fill our preview image with the color-histogram */
static void
fillPreview (GtkWidget *preview)
{
guchar *image, *column, *pixel;
gint x, y, rowstride;
gdouble histcount, val;
rowstride = PREWIDTH * 3;
image = g_new0 (guchar, PREWIDTH * rowstride);
for (x = 0, column = image; x < PREWIDTH; x++, column += 3)
{
/*
* For every channel, calculate a logarithmic value, scale it,
* and build a one-pixel bar.
* ... in the respective channel, preserving the other ones. --hb
*/
histcount = hist_red[x] > 1.0 ? hist_red[x] : 1.0;
val = log (histcount) * (PREHEIGHT / 12);
if (val > PREHEIGHT)
val = PREHEIGHT;
y = PREHEIGHT - 1;
pixel = column + (y * rowstride);
for (; y > (PREHEIGHT - val); y--)
{
pixel[0] = 255;
pixel -= rowstride;
}
histcount = hist_green[x] > 1.0 ? hist_green[x] : 1.0;
val = log (histcount) * (PREHEIGHT / 12);
if (val > PREHEIGHT)
val = PREHEIGHT;
y = PREHEIGHT - 1;
pixel = column + (y * rowstride);
for (; y > (PREHEIGHT - val); y--)
{
pixel[1] = 255;
pixel -= rowstride;
}
histcount = hist_blue[x] > 1.0 ? hist_blue[x] : 1.0;
val = log (histcount) * (PREHEIGHT / 12);
if (val > PREHEIGHT)
val = PREHEIGHT;
y = PREHEIGHT - 1;
pixel = column + (y * rowstride);
for (; y > (PREHEIGHT - val); y--)
{
pixel[2] = 255;
pixel -= rowstride;
}
}
/* move our data into the preview image */
gimp_preview_area_draw (GIMP_PREVIEW_AREA (preview),
0, 0, PREWIDTH, PREHEIGHT,
GIMP_RGB_IMAGE,
image,
3 * PREWIDTH);
g_free (image);
}
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