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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 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/>.
*/
#include "config.h"
#include <cairo.h>
#include <gegl.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpcolor/gimpcolor.h"
#include "core-types.h"
#include "gimpchannel.h"
#include "gimpcontainer.h"
#include "gimpcontext.h"
#include "gimpgradient.h"
#include "gimpimage.h"
#include "gimpimage-colormap.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,
GimpGradientBlendColorSpace blend_color_space,
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 (context, 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, blend_color_space,
&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_slice_new (ImgColors);
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 (gimp_palette_get_n_colors (palette) >= n_colors)
return;
/* TRANSLATORS: the "%s" is an item title and "%u" is the number of
occurrences for this item. */
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,
GimpContext *context,
gint n_colors)
{
GimpPalette *palette;
GSList *list = NULL;
GSList *iter;
palette = GIMP_PALETTE (gimp_palette_new (context, palette_name));
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);
for (iter = list; iter; iter = iter->next)
g_slice_free (ImgColors, iter->data);
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)
{
GeglBuffer *buffer;
GeglBufferIterator *iter;
GeglRectangle *mask_roi = NULL;
GeglRectangle rect = { x, y, width, height };
GHashTable *colors = NULL;
const Babl *format;
gint bpp;
gint mask_bpp = 0;
buffer = gimp_pickable_get_buffer (pickable);
format = babl_format ("R'G'B'A u8");
iter = gegl_buffer_iterator_new (buffer, &rect, 0, format,
GEGL_ACCESS_READ, GEGL_ABYSS_NONE, 2);
bpp = babl_format_get_bytes_per_pixel (format);
if (selection_only &&
! gimp_channel_is_empty (gimp_image_get_mask (image)))
{
GimpDrawable *mask = GIMP_DRAWABLE (gimp_image_get_mask (image));
rect.x = x + pickable_off_x;
rect.y = y + pickable_off_y;
buffer = gimp_drawable_get_buffer (mask);
format = babl_format ("Y u8");
gegl_buffer_iterator_add (iter, buffer, &rect, 0, format,
GEGL_ACCESS_READ, GEGL_ABYSS_NONE);
mask_roi = &iter->items[1].roi;
mask_bpp = babl_format_get_bytes_per_pixel (format);
}
while (gegl_buffer_iterator_next (iter))
{
const guchar *data = iter->items[0].data;
const guchar *mask_data = NULL;
gint length = iter->length;
if (mask_roi)
mask_data = iter->items[1].data;
while (length--)
{
/* ignore unselected, and completely transparent pixels */
if ((! mask_data || *mask_data) && data[ALPHA])
{
guchar rgba[MAX_CHANNELS] = { 0, };
guchar rgb_real[MAX_CHANNELS] = { 0, };
memcpy (rgba, data, 4);
memcpy (rgb_real, rgba, 4);
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);
}
data += bpp;
if (mask_data)
mask_data += mask_bpp;
}
}
return colors;
}
GimpPalette *
gimp_palette_import_from_image (GimpImage *image,
GimpContext *context,
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 (GIMP_IS_CONTEXT (context), 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));
if (selection_only)
{
gimp_item_bounds (GIMP_ITEM (gimp_image_get_mask (image)),
&x, &y, &width, &height);
}
else
{
x = 0;
y = 0;
width = gimp_image_get_width (image);
height = gimp_image_get_height (image);
}
colors = gimp_palette_import_extract (image,
GIMP_PICKABLE (image),
0, 0,
selection_only,
x, y, width, height,
n_colors, threshold);
return gimp_palette_import_make_palette (colors, palette_name, context,
n_colors);
}
/* create a palette from an indexed image **********************************/
GimpPalette *
gimp_palette_import_from_indexed_image (GimpImage *image,
GimpContext *context,
const gchar *palette_name)
{
GimpPalette *palette;
const guchar *colormap;
guint n_colors;
gint count;
GimpRGB color;
g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
g_return_val_if_fail (gimp_image_get_base_type (image) == GIMP_INDEXED, NULL);
g_return_val_if_fail (palette_name != NULL, NULL);
palette = GIMP_PALETTE (gimp_palette_new (context, palette_name));
colormap = gimp_image_get_colormap (image);
n_colors = gimp_image_get_colormap_size (image);
for (count = 0; count < n_colors; ++count)
{
gchar name[256];
g_snprintf (name, sizeof (name), _("Index %d"), count);
gimp_rgba_set_uchar (&color,
colormap[count * 3 + 0],
colormap[count * 3 + 1],
colormap[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,
GimpContext *context,
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_IS_CONTEXT (context), 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_item_mask_intersect (GIMP_ITEM (drawable),
&x, &y, &width, &height))
return NULL;
}
else
{
x = 0;
y = 0;
width = gimp_item_get_width (GIMP_ITEM (drawable));
height = gimp_item_get_height (GIMP_ITEM (drawable));
}
gimp_item_get_offset (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, context,
n_colors);
}
/* create a palette from a file **********************************/
GimpPalette *
gimp_palette_import_from_file (GimpContext *context,
GFile *file,
const gchar *palette_name,
GError **error)
{
GList *palette_list = NULL;
GInputStream *input;
GError *my_error = NULL;
g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
g_return_val_if_fail (G_IS_FILE (file), NULL);
g_return_val_if_fail (palette_name != NULL, NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
input = G_INPUT_STREAM (g_file_read (file, NULL, &my_error));
if (! input)
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_OPEN,
_("Could not open '%s' for reading: %s"),
gimp_file_get_utf8_name (file), my_error->message);
g_clear_error (&my_error);
return NULL;
}
switch (gimp_palette_load_detect_format (file, input))
{
case GIMP_PALETTE_FILE_FORMAT_GPL:
palette_list = gimp_palette_load (context, file, input, error);
break;
case GIMP_PALETTE_FILE_FORMAT_ACT:
palette_list = gimp_palette_load_act (context, file, input, error);
break;
case GIMP_PALETTE_FILE_FORMAT_RIFF_PAL:
palette_list = gimp_palette_load_riff (context, file, input, error);
break;
case GIMP_PALETTE_FILE_FORMAT_PSP_PAL:
palette_list = gimp_palette_load_psp (context, file, input, error);
break;
case GIMP_PALETTE_FILE_FORMAT_ACO:
palette_list = gimp_palette_load_aco (context, file, input, error);
break;
case GIMP_PALETTE_FILE_FORMAT_CSS:
palette_list = gimp_palette_load_css (context, file, input, error);
break;
default:
g_set_error (error,
GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
_("Unknown type of palette file: %s"),
gimp_file_get_utf8_name (file));
break;
}
g_object_unref (input);
if (palette_list)
{
GimpPalette *palette = g_object_ref (palette_list->data);
gimp_object_set_name (GIMP_OBJECT (palette), palette_name);
g_list_free_full (palette_list, (GDestroyNotify) g_object_unref);
return palette;
}
return NULL;
}
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