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gimp/app/core/gimppalette-import.c

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/* GIMP - The GNU 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>
#include <glib-object.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpcolor/gimpcolor.h"
#include "core-types.h"
#include "base/pixel-region.h"
#include "gimpchannel.h"
#include "gimpcontainer.h"
#include "gimpcontext.h"
#include "gimpgradient.h"
#include "gimpimage.h"
#include "gimppalette.h"
#include "gimppalette-import.h"
#include "gimppalette-load.h"
#include "gimppickable.h"
#include "gimp-intl.h"
#define MAX_IMAGE_COLORS (10000 * 2)
/* create a palette from a gradient ****************************************/
GimpPalette *
gimp_palette_import_from_gradient (GimpGradient *gradient,
GimpContext *context,
gboolean reverse,
const gchar *palette_name,
gint n_colors)
{
GimpPalette *palette;
GimpGradientSegment *seg = NULL;
gdouble dx, cur_x;
GimpRGB color;
gint i;
g_return_val_if_fail (GIMP_IS_GRADIENT (gradient), NULL);
g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
g_return_val_if_fail (palette_name != NULL, NULL);
g_return_val_if_fail (n_colors > 1, NULL);
palette = GIMP_PALETTE (gimp_palette_new (palette_name));
dx = 1.0 / (n_colors - 1);
for (i = 0, cur_x = 0; i < n_colors; i++, cur_x += dx)
{
seg = gimp_gradient_get_color_at (gradient, context,
seg, cur_x, reverse, &color);
gimp_palette_add_entry (palette, -1, 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 *table,
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 (table == NULL)
{
table = g_hash_table_new (g_direct_hash, g_direct_equal);
count_color_entries = 0;
}
else
{
found_color = g_hash_table_lookup (table, GUINT_TO_POINTER (key_colors));
}
if (found_color == NULL)
{
if (count_color_entries > MAX_IMAGE_COLORS)
{
/* Don't add any more new ones */
return table;
}
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 (table, GUINT_TO_POINTER (key_colors), new_color);
}
else
{
new_color = 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 table;
}
static void
gimp_palette_import_create_list (gpointer key,
gpointer value,
gpointer user_data)
{
GSList **list = user_data;
ImgColors *color_tab = value;
*list = g_slist_prepend (*list, color_tab);
}
static gint
gimp_palette_import_sort_colors (gconstpointer a,
gconstpointer b)
{
const ImgColors *s1 = a;
const ImgColors *s2 = 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 = user_data;
ImgColors *color_tab = data;
gint n_colors;
gchar *lab;
GimpRGB color;
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, -1, lab, &color);
g_free (lab);
}
static GimpPalette *
gimp_palette_import_make_palette (GHashTable *table,
const gchar *palette_name,
gint n_colors)
{
GimpPalette *palette = GIMP_PALETTE (gimp_palette_new (palette_name));
GSList *list = NULL;
if (! table)
return palette;
g_hash_table_foreach (table, gimp_palette_import_create_list, &list);
list = g_slist_sort (list, gimp_palette_import_sort_colors);
g_object_set_data (G_OBJECT (palette), "import-n-colors",
GINT_TO_POINTER (n_colors));
g_slist_foreach (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 (table);
g_slist_foreach (list, (GFunc) g_free, NULL);
g_slist_free (list);
return palette;
}
static GHashTable *
gimp_palette_import_extract (GimpImage *image,
GimpPickable *pickable,
gint pickable_off_x,
gint pickable_off_y,
gboolean selection_only,
gint x,
gint y,
gint width,
gint height,
gint n_colors,
gint threshold)
{
TileManager *tiles;
GimpImageType type;
PixelRegion region;
PixelRegion mask_region;
PixelRegion *maskPR = NULL;
gpointer pr;
GHashTable *colors = NULL;
tiles = gimp_pickable_get_tiles (pickable);
type = gimp_pickable_get_image_type (pickable);
pixel_region_init (&region, tiles, x, y, width, height, FALSE);
if (selection_only &&
! gimp_channel_is_empty (gimp_image_get_mask (image)))
{
pixel_region_init (&mask_region,
GIMP_DRAWABLE (gimp_image_get_mask (image))->tiles,
x + pickable_off_x, y + pickable_off_y,
width, height,
FALSE);
maskPR = &mask_region;
}
for (pr = pixel_regions_register (maskPR ? 2 : 1, &region, maskPR);
pr != NULL;
pr = pixel_regions_process (pr))
{
const guchar *data = region.data;
const guchar *mask_data = NULL;
gint i, j;
if (maskPR)
mask_data = maskPR->data;
for (i = 0; i < region.h; i++)
{
const guchar *idata = data;
const guchar *mdata = mask_data;
for (j = 0; j < region.w; j++)
{
if (! mdata || *mdata)
{
guchar rgba[MAX_CHANNELS];
gimp_image_get_color (image, type, idata, rgba);
/* ignore completely transparent pixels */
if (rgba[ALPHA_PIX])
{
guchar rgb_real[MAX_CHANNELS];
memcpy (rgb_real, rgba, MAX_CHANNELS);
rgba[0] = (rgba[0] / threshold) * threshold;
rgba[1] = (rgba[1] / threshold) * threshold;
rgba[2] = (rgba[2] / threshold) * threshold;
colors = gimp_palette_import_store_colors (colors,
rgba, rgb_real,
n_colors);
}
}
idata += region.bytes;
if (mdata)
mdata += maskPR->bytes;
}
data += region.rowstride;
if (mask_data)
mask_data += maskPR->rowstride;
}
}
return colors;
}
GimpPalette *
gimp_palette_import_from_image (GimpImage *image,
const gchar *palette_name,
gint n_colors,
gint threshold,
gboolean selection_only)
{
GHashTable *colors;
gint x, y;
gint width, height;
g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
g_return_val_if_fail (palette_name != NULL, NULL);
g_return_val_if_fail (n_colors > 1, NULL);
g_return_val_if_fail (threshold > 0, NULL);
gimp_pickable_flush (GIMP_PICKABLE (image->projection));
if (selection_only)
{
gimp_channel_bounds (gimp_image_get_mask (image),
&x, &y, &width, &height);
width -= x;
height -= y;
}
else
{
x = 0;
y = 0;
width = image->width;
height = image->height;
}
colors = gimp_palette_import_extract (image,
GIMP_PICKABLE (image->projection),
0, 0,
selection_only,
x, y, width, height,
n_colors, threshold);
return gimp_palette_import_make_palette (colors, palette_name, n_colors);
}
/* create a palette from an indexed image **********************************/
GimpPalette *
gimp_palette_import_from_indexed_image (GimpImage *image,
const gchar *palette_name)
{
GimpPalette *palette;
gint count;
GimpRGB color;
g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
g_return_val_if_fail (gimp_image_base_type (image) == GIMP_INDEXED, NULL);
g_return_val_if_fail (palette_name != NULL, NULL);
palette = GIMP_PALETTE (gimp_palette_new (palette_name));
for (count = 0; count < image->num_cols; ++count)
{
gchar name[256];
g_snprintf (name, sizeof (name), _("Index %d"), count);
gimp_rgba_set_uchar (&color,
image->cmap[count * 3 + 0],
image->cmap[count * 3 + 1],
image->cmap[count * 3 + 2],
255);
gimp_palette_add_entry (palette, -1, name, &color);
}
return palette;
}
/* create a palette from a drawable ****************************************/
GimpPalette *
gimp_palette_import_from_drawable (GimpDrawable *drawable,
const gchar *palette_name,
gint n_colors,
gint threshold,
gboolean selection_only)
{
GHashTable *colors = NULL;
gint x, y;
gint width, height;
gint off_x, off_y;
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), NULL);
g_return_val_if_fail (palette_name != NULL, NULL);
g_return_val_if_fail (n_colors > 1, NULL);
g_return_val_if_fail (threshold > 0, NULL);
if (selection_only)
{
if (! gimp_drawable_mask_intersect (drawable, &x, &y, &width, &height))
return NULL;
}
else
{
x = 0;
y = 0;
width = gimp_item_width (GIMP_ITEM (drawable));
height = gimp_item_height (GIMP_ITEM (drawable));
}
gimp_item_offsets (GIMP_ITEM (drawable), &off_x, &off_y);
colors =
gimp_palette_import_extract (gimp_item_get_image (GIMP_ITEM (drawable)),
GIMP_PICKABLE (drawable),
off_x, off_y,
selection_only,
x, y, width, height,
n_colors, threshold);
return gimp_palette_import_make_palette (colors, palette_name, n_colors);
}
/* create a palette from a file **********************************/
GimpPalette *
gimp_palette_import_from_file (const gchar *filename,
const gchar *palette_name,
GError **error)
{
GList *palette_list = NULL;
g_return_val_if_fail (filename != NULL, NULL);
g_return_val_if_fail (palette_name != NULL, NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
switch (gimp_palette_load_detect_format (filename))
{
case GIMP_PALETTE_FILE_FORMAT_GPL:
palette_list = gimp_palette_load (filename, error);
break;
case GIMP_PALETTE_FILE_FORMAT_ACT:
palette_list = gimp_palette_load_act (filename, error);
break;
case GIMP_PALETTE_FILE_FORMAT_RIFF_PAL:
palette_list = gimp_palette_load_riff (filename, error);
break;
case GIMP_PALETTE_FILE_FORMAT_PSP_PAL:
palette_list = gimp_palette_load_psp (filename, error);
break;
default:
g_set_error (error,
GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Unknown type of palette file: %s"),
gimp_filename_to_utf8 (filename));
break;
}
if (palette_list)
{
GimpPalette *palette = g_object_ref (palette_list->data);
gimp_object_set_name (GIMP_OBJECT (palette), palette_name);
g_list_foreach (palette_list, (GFunc) g_object_unref, NULL);
g_list_free (palette_list);
return palette;
}
return NULL;
}
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