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gimp/app/core/gimppalette-import.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <string.h> /* memcpy */
#include <glib-object.h>
#include "libgimpcolor/gimpcolor.h"
#include "core-types.h"
#include "base/pixel-region.h"
#include "gimpcontainer.h"
#include "gimpgradient.h"
#include "gimpimage.h"
#include "gimppalette.h"
#include "libgimp/gimpintl.h"
#define MAX_IMAGE_COLORS (10000 * 2)
/* create a palette from a gradient ****************************************/
GimpPalette *
gimp_palette_import_from_gradient (GimpGradient *gradient,
const gchar *palette_name,
gint n_colors)
{
GimpPalette *palette;
gdouble dx, cur_x;
GimpRGB color;
gint loop;
g_return_val_if_fail (GIMP_IS_GRADIENT (gradient), NULL);
g_return_val_if_fail (palette_name != NULL, NULL);
g_return_val_if_fail (n_colors > 0, NULL);
palette = GIMP_PALETTE (gimp_palette_new (palette_name));
dx = 1.0 / (n_colors - 1);
cur_x = 0;
for (loop = 0; loop < n_colors; loop++)
{
gimp_gradient_get_color_at (gradient, cur_x, &color);
cur_x += dx;
gimp_palette_add_entry (palette, NULL, &color);
}
return palette;
}
/* create a palette from a non-indexed image *******************************/
typedef struct _ImgColors ImgColors;
struct _ImgColors
{
guint count;
guint r_adj;
guint g_adj;
guint b_adj;
guchar r;
guchar g;
guchar b;
};
static gint count_color_entries = 0;
static GHashTable *
gimp_palette_import_store_colors (GHashTable *h_array,
guchar *colors,
guchar *colors_real,
gint n_colors)
{
gpointer found_color = NULL;
ImgColors *new_color;
guint key_colors = colors[0] * 256 * 256 + colors[1] * 256 + colors[2];
if (h_array == NULL)
{
h_array = g_hash_table_new (g_direct_hash, g_direct_equal);
count_color_entries = 0;
}
else
{
found_color = g_hash_table_lookup (h_array, (gpointer) key_colors);
}
if (found_color == NULL)
{
if (count_color_entries > MAX_IMAGE_COLORS)
{
/* Don't add any more new ones */
return h_array;
}
count_color_entries++;
new_color = g_new (ImgColors, 1);
new_color->count = 1;
new_color->r_adj = 0;
new_color->g_adj = 0;
new_color->b_adj = 0;
new_color->r = colors[0];
new_color->g = colors[1];
new_color->b = colors[2];
g_hash_table_insert (h_array, (gpointer) key_colors, new_color);
}
else
{
new_color = (ImgColors *) found_color;
if (new_color->count < (G_MAXINT - 1))
new_color->count++;
/* Now do the adjustments ...*/
new_color->r_adj += (colors_real[0] - colors[0]);
new_color->g_adj += (colors_real[1] - colors[1]);
new_color->b_adj += (colors_real[2] - colors[2]);
/* Boundary conditions */
if(new_color->r_adj > (G_MAXINT - 255))
new_color->r_adj /= new_color->count;
if(new_color->g_adj > (G_MAXINT - 255))
new_color->g_adj /= new_color->count;
if(new_color->b_adj > (G_MAXINT - 255))
new_color->b_adj /= new_color->count;
}
return h_array;
}
static void
gimp_palette_import_create_sorted_list (gpointer key,
gpointer value,
gpointer user_data)
{
GSList **sorted_list = (GSList**) user_data;
ImgColors *color_tab = (ImgColors *) value;
*sorted_list = g_slist_prepend (*sorted_list, color_tab);
}
static gint
gimp_palette_import_sort_colors (gconstpointer a,
gconstpointer b)
{
ImgColors *s1 = (ImgColors *) a;
ImgColors *s2 = (ImgColors *) b;
if(s1->count > s2->count)
return -1;
if(s1->count < s2->count)
return 1;
return 0;
}
static void
gimp_palette_import_create_image_palette (gpointer data,
gpointer user_data)
{
GimpPalette *palette;
ImgColors *color_tab;
gint n_colors;
gchar *lab;
GimpRGB color;
palette = (GimpPalette *) user_data;
color_tab = (ImgColors *) data;
n_colors = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (palette),
"import_n_colors"));
if (palette->n_colors >= n_colors)
return;
lab = g_strdup_printf ("%s (occurs %u)", _("Untitled"), color_tab->count);
/* Adjust the colors to the mean of the the sample */
gimp_rgba_set_uchar
(&color,
(guchar) color_tab->r + (color_tab->r_adj / color_tab->count),
(guchar) color_tab->g + (color_tab->g_adj / color_tab->count),
(guchar) color_tab->b + (color_tab->b_adj / color_tab->count),
255);
gimp_palette_add_entry (palette, lab, &color);
g_free (lab);
}
static GimpPalette *
gimp_palette_import_image_make_palette (GHashTable *h_array,
const gchar *palette_name,
gint n_colors)
{
GimpPalette *palette;
GSList *sorted_list = NULL;
g_hash_table_foreach (h_array, gimp_palette_import_create_sorted_list,
&sorted_list);
sorted_list = g_slist_sort (sorted_list, gimp_palette_import_sort_colors);
palette = GIMP_PALETTE (gimp_palette_new (palette_name));
g_object_set_data (G_OBJECT (palette), "import_n_colors",
GINT_TO_POINTER (n_colors));
g_slist_foreach (sorted_list, gimp_palette_import_create_image_palette,
palette);
g_object_set_data (G_OBJECT (palette), "import_n_colors", NULL);
/* Free up used memory
* Note the same structure is on both the hash list and the sorted
* list. So only delete it once.
*/
g_hash_table_destroy (h_array);
g_slist_foreach (sorted_list, (GFunc) g_free, NULL);
g_slist_free (sorted_list);
return palette;
}
GimpPalette *
gimp_palette_import_from_image (GimpImage *gimage,
const gchar *palette_name,
gint n_colors,
gint threshold)
{
PixelRegion imagePR;
guchar *image_data;
guchar *idata;
guchar rgb[MAX_CHANNELS];
guchar rgb_real[MAX_CHANNELS];
gint has_alpha, indexed;
gint width, height;
gint bytes, alpha;
gint i, j;
void *pr;
gint d_type;
GHashTable *store_array = NULL;
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), NULL);
g_return_val_if_fail (palette_name != NULL, NULL);
g_return_val_if_fail (n_colors > 0, NULL);
g_return_val_if_fail (threshold > 0, NULL);
/* Get the image information */
bytes = gimp_image_composite_bytes (gimage);
d_type = gimp_image_composite_type (gimage);
has_alpha = GIMP_IMAGE_TYPE_HAS_ALPHA (d_type);
indexed = d_type == INDEXEDA_GIMAGE || d_type == INDEXED_GIMAGE;
width = gimage->width;
height = gimage->height;
pixel_region_init (&imagePR, gimp_image_composite (gimage), 0, 0,
width, height, FALSE);
alpha = bytes - 1;
/* iterate over the entire image */
for (pr = pixel_regions_register (1, &imagePR);
pr != NULL;
pr = pixel_regions_process (pr))
{
image_data = imagePR.data;
for (i = 0; i < imagePR.h; i++)
{
idata = image_data;
for (j = 0; j < imagePR.w; j++)
{
/* Get the rgb values for the color */
gimp_image_get_color (gimage, d_type, rgb, idata);
memcpy (rgb_real, rgb, MAX_CHANNELS); /* Structure copy */
rgb[0] = (rgb[0] / threshold) * threshold;
rgb[1] = (rgb[1] / threshold) * threshold;
rgb[2] = (rgb[2] / threshold) * threshold;
store_array =
gimp_palette_import_store_colors (store_array, rgb, rgb_real,
n_colors);
idata += bytes;
}
image_data += imagePR.rowstride;
}
}
return gimp_palette_import_image_make_palette (store_array,
palette_name,
n_colors);
}
/* create a palette from an indexed image **********************************/
GimpPalette *
gimp_palette_import_from_indexed_image (GimpImage *gimage,
const gchar *palette_name)
{
GimpPalette *palette;
gint count;
GimpRGB color;
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), NULL);
g_return_val_if_fail (gimp_image_base_type (gimage) == INDEXED, NULL);
g_return_val_if_fail (palette_name != NULL, NULL);
if (! (gimage && gimp_image_base_type (gimage) == INDEXED))
return NULL;
palette = GIMP_PALETTE (gimp_palette_new (palette_name));
for (count= 0; count < gimage->num_cols; ++count)
{
gimp_rgba_set_uchar (&color,
gimage->cmap[count * 3],
gimage->cmap[count * 3 + 1],
gimage->cmap[count * 3 + 2],
255);
gimp_palette_add_entry (palette, NULL, &color);
}
return palette;
}
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