PIKApp/app/core/pikapalette.c

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2023-09-26 00:35:21 +02:00
/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* 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 <string.h>
#include <cairo.h>
#include <gegl.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "libpikabase/pikabase.h"
#include "libpikacolor/pikacolor.h"
#include "core-types.h"
#include "pika-memsize.h"
#include "pikapalette.h"
#include "pikapalette-load.h"
#include "pikapalette-save.h"
#include "pikatagged.h"
#include "pikatempbuf.h"
#include "pika-intl.h"
#define RGB_EPSILON 1e-6
/* local function prototypes */
static void pika_palette_tagged_iface_init (PikaTaggedInterface *iface);
static void pika_palette_finalize (GObject *object);
static gint64 pika_palette_get_memsize (PikaObject *object,
gint64 *gui_size);
static void pika_palette_get_preview_size (PikaViewable *viewable,
gint size,
gboolean popup,
gboolean dot_for_dot,
gint *width,
gint *height);
static gboolean pika_palette_get_popup_size (PikaViewable *viewable,
gint width,
gint height,
gboolean dot_for_dot,
gint *popup_width,
gint *popup_height);
static PikaTempBuf * pika_palette_get_new_preview (PikaViewable *viewable,
PikaContext *context,
gint width,
gint height);
static gchar * pika_palette_get_description (PikaViewable *viewable,
gchar **tooltip);
static const gchar * pika_palette_get_extension (PikaData *data);
static void pika_palette_copy (PikaData *data,
PikaData *src_data);
static void pika_palette_entry_free (PikaPaletteEntry *entry);
static gint64 pika_palette_entry_get_memsize (PikaPaletteEntry *entry,
gint64 *gui_size);
static gchar * pika_palette_get_checksum (PikaTagged *tagged);
G_DEFINE_TYPE_WITH_CODE (PikaPalette, pika_palette, PIKA_TYPE_DATA,
G_IMPLEMENT_INTERFACE (PIKA_TYPE_TAGGED,
pika_palette_tagged_iface_init))
#define parent_class pika_palette_parent_class
static void
pika_palette_class_init (PikaPaletteClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PikaObjectClass *pika_object_class = PIKA_OBJECT_CLASS (klass);
PikaViewableClass *viewable_class = PIKA_VIEWABLE_CLASS (klass);
PikaDataClass *data_class = PIKA_DATA_CLASS (klass);
object_class->finalize = pika_palette_finalize;
pika_object_class->get_memsize = pika_palette_get_memsize;
viewable_class->default_icon_name = "gtk-select-color";
viewable_class->get_preview_size = pika_palette_get_preview_size;
viewable_class->get_popup_size = pika_palette_get_popup_size;
viewable_class->get_new_preview = pika_palette_get_new_preview;
viewable_class->get_description = pika_palette_get_description;
data_class->save = pika_palette_save;
data_class->get_extension = pika_palette_get_extension;
data_class->copy = pika_palette_copy;
}
static void
pika_palette_tagged_iface_init (PikaTaggedInterface *iface)
{
iface->get_checksum = pika_palette_get_checksum;
}
static void
pika_palette_init (PikaPalette *palette)
{
palette->colors = NULL;
palette->n_colors = 0;
palette->n_columns = 0;
}
static void
pika_palette_finalize (GObject *object)
{
PikaPalette *palette = PIKA_PALETTE (object);
if (palette->colors)
{
g_list_free_full (palette->colors,
(GDestroyNotify) pika_palette_entry_free);
palette->colors = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gint64
pika_palette_get_memsize (PikaObject *object,
gint64 *gui_size)
{
PikaPalette *palette = PIKA_PALETTE (object);
gint64 memsize = 0;
memsize += pika_g_list_get_memsize_foreach (palette->colors,
(PikaMemsizeFunc)
pika_palette_entry_get_memsize,
gui_size);
return memsize + PIKA_OBJECT_CLASS (parent_class)->get_memsize (object,
gui_size);
}
static void
pika_palette_get_preview_size (PikaViewable *viewable,
gint size,
gboolean popup,
gboolean dot_for_dot,
gint *width,
gint *height)
{
*width = size;
*height = 1 + size / 2;
}
static gboolean
pika_palette_get_popup_size (PikaViewable *viewable,
gint width,
gint height,
gboolean dot_for_dot,
gint *popup_width,
gint *popup_height)
{
PikaPalette *palette = PIKA_PALETTE (viewable);
gint p_width;
gint p_height;
if (! palette->n_colors)
return FALSE;
if (palette->n_columns)
p_width = palette->n_columns;
else
p_width = MIN (palette->n_colors, 16);
p_height = MAX (1, palette->n_colors / p_width);
if (p_width * 4 > width || p_height * 4 > height)
{
*popup_width = p_width * 4;
*popup_height = p_height * 4;
return TRUE;
}
return FALSE;
}
static PikaTempBuf *
pika_palette_get_new_preview (PikaViewable *viewable,
PikaContext *context,
gint width,
gint height)
{
PikaPalette *palette = PIKA_PALETTE (viewable);
PikaTempBuf *temp_buf;
guchar *buf;
guchar *b;
GList *list;
gint columns;
gint rows;
gint cell_size;
gint x, y;
temp_buf = pika_temp_buf_new (width, height, babl_format ("R'G'B' u8"));
memset (pika_temp_buf_get_data (temp_buf), 255, width * height * 3);
if (palette->n_columns > 1)
cell_size = MAX (4, width / palette->n_columns);
else
cell_size = 4;
columns = width / cell_size;
rows = height / cell_size;
buf = pika_temp_buf_get_data (temp_buf);
b = g_new (guchar, width * 3);
list = palette->colors;
for (y = 0; y < rows && list; y++)
{
gint i;
memset (b, 255, width * 3);
for (x = 0; x < columns && list; x++)
{
PikaPaletteEntry *entry = list->data;
list = g_list_next (list);
pika_rgb_get_uchar (&entry->color,
&b[x * cell_size * 3 + 0],
&b[x * cell_size * 3 + 1],
&b[x * cell_size * 3 + 2]);
for (i = 1; i < cell_size; i++)
{
b[(x * cell_size + i) * 3 + 0] = b[(x * cell_size) * 3 + 0];
b[(x * cell_size + i) * 3 + 1] = b[(x * cell_size) * 3 + 1];
b[(x * cell_size + i) * 3 + 2] = b[(x * cell_size) * 3 + 2];
}
}
for (i = 0; i < cell_size; i++)
memcpy (buf + ((y * cell_size + i) * width) * 3, b, width * 3);
}
g_free (b);
return temp_buf;
}
static gchar *
pika_palette_get_description (PikaViewable *viewable,
gchar **tooltip)
{
PikaPalette *palette = PIKA_PALETTE (viewable);
return g_strdup_printf ("%s (%d)",
pika_object_get_name (palette),
palette->n_colors);
}
PikaData *
pika_palette_new (PikaContext *context,
const gchar *name)
{
g_return_val_if_fail (name != NULL, NULL);
g_return_val_if_fail (*name != '\0', NULL);
return g_object_new (PIKA_TYPE_PALETTE,
"name", name,
NULL);
}
PikaData *
pika_palette_get_standard (PikaContext *context)
{
static PikaData *standard_palette = NULL;
if (! standard_palette)
{
g_set_weak_pointer (&standard_palette,
pika_palette_new (context, "Standard"));
pika_data_clean (standard_palette);
pika_data_make_internal (standard_palette, "pika-palette-standard");
}
return standard_palette;
}
static const gchar *
pika_palette_get_extension (PikaData *data)
{
return PIKA_PALETTE_FILE_EXTENSION;
}
static void
pika_palette_copy (PikaData *data,
PikaData *src_data)
{
PikaPalette *palette = PIKA_PALETTE (data);
PikaPalette *src_palette = PIKA_PALETTE (src_data);
GList *list;
pika_data_freeze (data);
if (palette->colors)
{
g_list_free_full (palette->colors,
(GDestroyNotify) pika_palette_entry_free);
palette->colors = NULL;
}
palette->n_colors = 0;
palette->n_columns = src_palette->n_columns;
for (list = src_palette->colors; list; list = g_list_next (list))
{
PikaPaletteEntry *entry = list->data;
pika_palette_add_entry (palette, -1, entry->name, &entry->color);
}
pika_data_thaw (data);
}
static gchar *
pika_palette_get_checksum (PikaTagged *tagged)
{
PikaPalette *palette = PIKA_PALETTE (tagged);
gchar *checksum_string = NULL;
if (palette->n_colors > 0)
{
GChecksum *checksum = g_checksum_new (G_CHECKSUM_MD5);
GList *color_iterator = palette->colors;
g_checksum_update (checksum, (const guchar *) &palette->n_colors, sizeof (palette->n_colors));
g_checksum_update (checksum, (const guchar *) &palette->n_columns, sizeof (palette->n_columns));
while (color_iterator)
{
PikaPaletteEntry *entry = (PikaPaletteEntry *) color_iterator->data;
g_checksum_update (checksum, (const guchar *) &entry->color, sizeof (entry->color));
if (entry->name)
g_checksum_update (checksum, (const guchar *) entry->name, strlen (entry->name));
color_iterator = g_list_next (color_iterator);
}
checksum_string = g_strdup (g_checksum_get_string (checksum));
g_checksum_free (checksum);
}
return checksum_string;
}
/* public functions */
GList *
pika_palette_get_colors (PikaPalette *palette)
{
g_return_val_if_fail (PIKA_IS_PALETTE (palette), NULL);
return palette->colors;
}
gint
pika_palette_get_n_colors (PikaPalette *palette)
{
g_return_val_if_fail (PIKA_IS_PALETTE (palette), 0);
return palette->n_colors;
}
void
pika_palette_move_entry (PikaPalette *palette,
PikaPaletteEntry *entry,
gint position)
{
g_return_if_fail (PIKA_IS_PALETTE (palette));
g_return_if_fail (entry != NULL);
if (g_list_find (palette->colors, entry))
{
palette->colors = g_list_remove (palette->colors,
entry);
palette->colors = g_list_insert (palette->colors,
entry, position);
pika_data_dirty (PIKA_DATA (palette));
}
}
PikaPaletteEntry *
pika_palette_add_entry (PikaPalette *palette,
gint position,
const gchar *name,
const PikaRGB *color)
{
PikaPaletteEntry *entry;
g_return_val_if_fail (PIKA_IS_PALETTE (palette), NULL);
g_return_val_if_fail (color != NULL, NULL);
entry = g_slice_new0 (PikaPaletteEntry);
entry->color = *color;
entry->name = g_strdup (name ? name : _("Untitled"));
if (position < 0 || position >= palette->n_colors)
{
palette->colors = g_list_append (palette->colors, entry);
}
else
{
palette->colors = g_list_insert (palette->colors, entry, position);
}
palette->n_colors += 1;
pika_data_dirty (PIKA_DATA (palette));
return entry;
}
void
pika_palette_delete_entry (PikaPalette *palette,
PikaPaletteEntry *entry)
{
g_return_if_fail (PIKA_IS_PALETTE (palette));
g_return_if_fail (entry != NULL);
if (g_list_find (palette->colors, entry))
{
pika_palette_entry_free (entry);
palette->colors = g_list_remove (palette->colors, entry);
palette->n_colors--;
pika_data_dirty (PIKA_DATA (palette));
}
}
gboolean
pika_palette_set_entry (PikaPalette *palette,
gint position,
const gchar *name,
const PikaRGB *color)
{
PikaPaletteEntry *entry;
g_return_val_if_fail (PIKA_IS_PALETTE (palette), FALSE);
g_return_val_if_fail (color != NULL, FALSE);
entry = pika_palette_get_entry (palette, position);
if (! entry)
return FALSE;
entry->color = *color;
if (entry->name)
g_free (entry->name);
entry->name = g_strdup (name);
pika_data_dirty (PIKA_DATA (palette));
return TRUE;
}
gboolean
pika_palette_set_entry_color (PikaPalette *palette,
gint position,
const PikaRGB *color)
{
PikaPaletteEntry *entry;
g_return_val_if_fail (PIKA_IS_PALETTE (palette), FALSE);
g_return_val_if_fail (color != NULL, FALSE);
entry = pika_palette_get_entry (palette, position);
if (! entry)
return FALSE;
entry->color = *color;
pika_data_dirty (PIKA_DATA (palette));
return TRUE;
}
gboolean
pika_palette_set_entry_name (PikaPalette *palette,
gint position,
const gchar *name)
{
PikaPaletteEntry *entry;
g_return_val_if_fail (PIKA_IS_PALETTE (palette), FALSE);
entry = pika_palette_get_entry (palette, position);
if (! entry)
return FALSE;
if (entry->name)
g_free (entry->name);
entry->name = g_strdup (name);
pika_data_dirty (PIKA_DATA (palette));
return TRUE;
}
PikaPaletteEntry *
pika_palette_get_entry (PikaPalette *palette,
gint position)
{
g_return_val_if_fail (PIKA_IS_PALETTE (palette), NULL);
return g_list_nth_data (palette->colors, position);
}
gint
pika_palette_get_entry_position (PikaPalette *palette,
PikaPaletteEntry *entry)
{
g_return_val_if_fail (PIKA_IS_PALETTE (palette), -1);
g_return_val_if_fail (entry != NULL, -1);
return g_list_index (palette->colors, entry);
}
void
pika_palette_set_columns (PikaPalette *palette,
gint columns)
{
g_return_if_fail (PIKA_IS_PALETTE (palette));
columns = CLAMP (columns, 0, 64);
if (palette->n_columns != columns)
{
palette->n_columns = columns;
pika_data_dirty (PIKA_DATA (palette));
}
}
gint
pika_palette_get_columns (PikaPalette *palette)
{
g_return_val_if_fail (PIKA_IS_PALETTE (palette), 0);
return palette->n_columns;
}
PikaPaletteEntry *
pika_palette_find_entry (PikaPalette *palette,
const PikaRGB *color,
PikaPaletteEntry *start_from)
{
PikaPaletteEntry *entry;
g_return_val_if_fail (PIKA_IS_PALETTE (palette), NULL);
g_return_val_if_fail (color != NULL, NULL);
if (! start_from)
{
GList *list;
/* search from the start */
for (list = palette->colors; list; list = g_list_next (list))
{
entry = (PikaPaletteEntry *) list->data;
if (pika_rgb_distance (&entry->color, color) < RGB_EPSILON)
return entry;
}
}
else if (pika_rgb_distance (&start_from->color, color) < RGB_EPSILON)
{
return start_from;
}
else
{
GList *old = g_list_find (palette->colors, start_from);
GList *next;
GList *prev;
g_return_val_if_fail (old != NULL, NULL);
next = old->next;
prev = old->prev;
/* proximity-based search */
while (next || prev)
{
if (next)
{
entry = (PikaPaletteEntry *) next->data;
if (pika_rgb_distance (&entry->color, color) < RGB_EPSILON)
return entry;
next = next->next;
}
if (prev)
{
entry = (PikaPaletteEntry *) prev->data;
if (pika_rgb_distance (&entry->color, color) < RGB_EPSILON)
return entry;
prev = prev->prev;
}
}
}
return NULL;
}
/* private functions */
static void
pika_palette_entry_free (PikaPaletteEntry *entry)
{
g_return_if_fail (entry != NULL);
g_free (entry->name);
g_slice_free (PikaPaletteEntry, entry);
}
static gint64
pika_palette_entry_get_memsize (PikaPaletteEntry *entry,
gint64 *gui_size)
{
gint64 memsize = sizeof (PikaPaletteEntry);
memsize += pika_string_get_memsize (entry->name);
return memsize;
}