PIKApp/plug-ins/common/gradient-map.c

488 lines
15 KiB
C

/* 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
*
* Gradient Map plug-in
* Copyright (C) 1997 Eiichi Takamori <taka@ma1.seikyou.ne.jp>
*
* 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 <libpika/pika.h>
#include "libpika/stdplugins-intl.h"
/* Some useful macros */
#define GRADMAP_PROC "plug-in-gradmap"
#define PALETTEMAP_PROC "plug-in-palettemap"
#define PLUG_IN_BINARY "gradient-map"
#define PLUG_IN_ROLE "pika-gradient-map"
#define NSAMPLES 2048
typedef enum
{
GRADIENT_MODE = 1,
PALETTE_MODE
} MapMode;
typedef struct _Map Map;
typedef struct _MapClass MapClass;
struct _Map
{
PikaPlugIn parent_instance;
};
struct _MapClass
{
PikaPlugInClass parent_class;
};
#define MAP_TYPE (map_get_type ())
#define MAP(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), MAP_TYPE, Map))
GType map_get_type (void) G_GNUC_CONST;
static GList * map_query_procedures (PikaPlugIn *plug_in);
static PikaProcedure * map_create_procedure (PikaPlugIn *plug_in,
const gchar *name);
static PikaValueArray * map_run (PikaProcedure *procedure,
PikaRunMode run_mode,
PikaImage *image,
gint n_drawables,
PikaDrawable **drawables,
PikaProcedureConfig *config,
gpointer run_data);
static void map (GeglBuffer *buffer,
GeglBuffer *shadow_buffer,
PikaDrawable *drawable,
MapMode mode);
static gdouble * get_samples_gradient (PikaDrawable *drawable);
static gdouble * get_samples_palette (PikaDrawable *drawable);
G_DEFINE_TYPE (Map, map, PIKA_TYPE_PLUG_IN)
PIKA_MAIN (MAP_TYPE)
DEFINE_STD_SET_I18N
static void
map_class_init (MapClass *klass)
{
PikaPlugInClass *plug_in_class = PIKA_PLUG_IN_CLASS (klass);
plug_in_class->query_procedures = map_query_procedures;
plug_in_class->create_procedure = map_create_procedure;
plug_in_class->set_i18n = STD_SET_I18N;
}
static void
map_init (Map *map)
{
}
static GList *
map_query_procedures (PikaPlugIn *plug_in)
{
GList *list = NULL;
list = g_list_append (list, g_strdup (GRADMAP_PROC));
list = g_list_append (list, g_strdup (PALETTEMAP_PROC));
return list;
}
static PikaProcedure *
map_create_procedure (PikaPlugIn *plug_in,
const gchar *name)
{
PikaProcedure *procedure = NULL;
if (! strcmp (name, GRADMAP_PROC))
{
procedure = pika_image_procedure_new (plug_in, name,
PIKA_PDB_PROC_TYPE_PLUGIN,
map_run,
GINT_TO_POINTER (GRADIENT_MODE),
NULL);
pika_procedure_set_image_types (procedure, "RGB*, GRAY*");
pika_procedure_set_sensitivity_mask (procedure,
PIKA_PROCEDURE_SENSITIVE_DRAWABLE);
pika_procedure_set_menu_label (procedure, _("_Gradient Map"));
pika_procedure_add_menu_path (procedure, "<Image>/Colors/Map");
pika_procedure_set_documentation (procedure,
_("Recolor the image using colors "
"from the active gradient"),
"This plug-in maps the contents of "
"the specified drawable with active "
"gradient. It calculates luminosity "
"of each pixel and replaces the pixel "
"by the sample of active gradient at "
"the position proportional to that "
"luminosity. Complete black pixel "
"becomes the leftmost color of the "
"gradient, and complete white becomes "
"the rightmost. Works on both "
"Grayscale and RGB image "
"with/without alpha channel.",
name);
pika_procedure_set_attribution (procedure,
"Eiichi Takamori",
"Eiichi Takamori",
"1997");
}
else if (! strcmp (name, PALETTEMAP_PROC))
{
procedure = pika_image_procedure_new (plug_in, name,
PIKA_PDB_PROC_TYPE_PLUGIN,
map_run,
GINT_TO_POINTER (PALETTE_MODE),
NULL);
pika_procedure_set_image_types (procedure, "RGB*, GRAY*");
pika_procedure_set_sensitivity_mask (procedure,
PIKA_PROCEDURE_SENSITIVE_DRAWABLE);
pika_procedure_set_menu_label (procedure, _("_Palette Map"));
pika_procedure_add_menu_path (procedure, "<Image>/Colors/Map");
pika_procedure_set_documentation (procedure,
_("Recolor the image using colors "
"from the active palette"),
"This plug-in maps the contents of "
"the specified drawable with the "
"active palette. It calculates "
"luminosity of each pixel and "
"replaces the pixel by the palette "
"sample at the corresponding index. "
"A complete black pixel becomes the "
"lowest palette entry, and complete "
"white becomes the highest. Works on "
"both Grayscale and RGB image "
"with/without alpha channel.",
name);
pika_procedure_set_attribution (procedure,
"Bill Skaggs",
"Bill Skaggs",
"2004");
}
return procedure;
}
static PikaValueArray *
map_run (PikaProcedure *procedure,
PikaRunMode run_mode,
PikaImage *image,
gint n_drawables,
PikaDrawable **drawables,
PikaProcedureConfig *config,
gpointer run_data)
{
MapMode mode = GPOINTER_TO_INT (run_data);
GeglBuffer *shadow_buffer;
GeglBuffer *buffer;
PikaDrawable *drawable;
gegl_init (NULL, NULL);
if (n_drawables != 1)
{
GError *error = NULL;
g_set_error (&error, PIKA_PLUG_IN_ERROR, 0,
_("Procedure '%s' only works with one drawable."),
pika_procedure_get_name (procedure));
return pika_procedure_new_return_values (procedure,
PIKA_PDB_CALLING_ERROR,
error);
}
else
{
drawable = drawables[0];
}
shadow_buffer = pika_drawable_get_shadow_buffer (drawable);
buffer = pika_drawable_get_buffer (drawable);
/* Make sure that the drawable is gray or RGB color */
if (pika_drawable_is_rgb (drawable) ||
pika_drawable_is_gray (drawable))
{
if (mode == GRADIENT_MODE)
{
pika_progress_init (_("Gradient Map"));
}
else
{
pika_progress_init (_("Palette Map"));
}
map (buffer, shadow_buffer, drawable, mode);
}
else
{
return pika_procedure_new_return_values (procedure,
PIKA_PDB_EXECUTION_ERROR,
NULL);
}
g_object_unref (buffer);
g_object_unref (shadow_buffer);
pika_drawable_merge_shadow (drawable, TRUE);
pika_drawable_update (drawable, 0, 0,
pika_drawable_get_width (drawable),
pika_drawable_get_height (drawable));
if (run_mode != PIKA_RUN_NONINTERACTIVE)
pika_displays_flush ();
return pika_procedure_new_return_values (procedure, PIKA_PDB_SUCCESS, NULL);
}
static void
map (GeglBuffer *buffer,
GeglBuffer *shadow_buffer,
PikaDrawable *drawable,
MapMode mode)
{
GeglBufferIterator *gi;
gint nb_color_chan;
gint nb_chan;
gint nb_chan2;
gint nb_chan_samp;
gint index_iter;
gboolean interpolate;
gdouble *samples;
gboolean is_rgb;
gboolean has_alpha;
const Babl *format_shadow;
const Babl *format_buffer;
is_rgb = pika_drawable_is_rgb (drawable);
has_alpha = pika_drawable_has_alpha (drawable);
switch (mode)
{
case GRADIENT_MODE:
samples = get_samples_gradient (drawable);
interpolate = TRUE;
break;
case PALETTE_MODE:
samples = get_samples_palette (drawable);
interpolate = FALSE;
break;
default:
g_error ("plug_in_gradmap: invalid mode");
}
if (is_rgb)
{
nb_color_chan = 3;
nb_chan_samp = 4;
if (has_alpha)
format_shadow = babl_format ("R'G'B'A float");
else
format_shadow = babl_format ("R'G'B' float");
}
else
{
nb_color_chan = 1;
nb_chan_samp = 2;
if (has_alpha)
format_shadow = babl_format ("Y'A float");
else
format_shadow = babl_format ("Y' float");
}
if (has_alpha)
{
nb_chan = nb_color_chan + 1;
nb_chan2 = 2;
format_buffer = babl_format ("Y'A float");
}
else
{
nb_chan = nb_color_chan;
nb_chan2 = 1;
format_buffer = babl_format ("Y' float");
}
gi = gegl_buffer_iterator_new (shadow_buffer, NULL, 0, format_shadow,
GEGL_ACCESS_WRITE, GEGL_ABYSS_NONE, 2);
index_iter = gegl_buffer_iterator_add (gi, buffer, NULL,
0, format_buffer,
GEGL_ACCESS_READ, GEGL_ABYSS_NONE);
while (gegl_buffer_iterator_next (gi))
{
guint k;
gfloat *data;
gfloat *data2;
data = (gfloat*) gi->items[0].data;
data2 = (gfloat*) gi->items[index_iter].data;
if (interpolate)
{
for (k = 0; k < gi->length; k++)
{
gint b, ind1, ind2;
gdouble *samp1, *samp2;
gfloat c1, c2, val;
val = data2[0] * (NSAMPLES-1);
ind1 = CLAMP (floor (val), 0, NSAMPLES-1);
ind2 = CLAMP (ceil (val), 0, NSAMPLES-1);
c1 = 1.0 - (val - ind1);
c2 = 1.0 - c1;
samp1 = &(samples[ind1 * nb_chan_samp]);
samp2 = &(samples[ind2 * nb_chan_samp]);
for (b = 0; b < nb_color_chan; b++)
data[b] = (samp1[b] * c1 + samp2[b] * c2);
if (has_alpha)
{
float alpha = (samp1[b] * c1 + samp2[b] * c2);
data[b] = alpha * data2[1];
}
data += nb_chan;
data2 += nb_chan2;
}
}
else
{
for (k = 0; k < gi->length; k++)
{
gint b, ind;
gdouble *samp;
ind = CLAMP (data2[0] * (NSAMPLES-1), 0, NSAMPLES-1);
samp = &(samples[ind * nb_chan_samp]);
for (b = 0; b < nb_color_chan; b++)
data[b] = samp[b];
if (has_alpha)
{
data[b] = samp[b] * data2[1];
}
data += nb_chan;
data2 += nb_chan2;
}
}
}
g_free (samples);
}
/*
Returns 2048 samples of the gradient.
Each sample is (R'G'B'A float) or (Y'A float), depending on the drawable
*/
static gdouble *
get_samples_gradient (PikaDrawable *drawable)
{
PikaGradient *gradient;
gint n_d_samples;
gdouble *d_samples = NULL;
gradient = pika_context_get_gradient ();
/* FIXME: "reverse" hardcoded to FALSE. */
pika_gradient_get_uniform_samples (gradient, NSAMPLES, FALSE,
&n_d_samples, &d_samples);
if (! pika_drawable_is_rgb (drawable))
{
const Babl *format_src = babl_format ("R'G'B'A double");
const Babl *format_dst = babl_format ("Y'A double");
const Babl *fish = babl_fish (format_src, format_dst);
babl_process (fish, d_samples, d_samples, NSAMPLES);
}
return d_samples;
}
/*
Returns 2048 samples of the palette.
Each sample is (R'G'B'A float) or (Y'A float), depending on the drawable
*/
static gdouble *
get_samples_palette (PikaDrawable *drawable)
{
PikaPalette *palette;
PikaRGB color_sample;
gdouble *d_samples, *d_samp;
gboolean is_rgb;
gdouble factor;
gint pal_entry, num_colors;
gint nb_color_chan, nb_chan, i;
const Babl *format;
palette = pika_context_get_palette ();
num_colors = pika_palette_get_color_count (palette);
is_rgb = pika_drawable_is_rgb (drawable);
factor = ((double) num_colors) / NSAMPLES;
format = is_rgb ? babl_format ("R'G'B'A double") : babl_format ("Y'A double");
nb_color_chan = is_rgb ? 3 : 1;
nb_chan = nb_color_chan + 1;
d_samples = g_new (gdouble, NSAMPLES * nb_chan);
for (i = 0; i < NSAMPLES; i++)
{
d_samp = &d_samples[i * nb_chan];
pal_entry = CLAMP ((int)(i * factor), 0, num_colors - 1);
pika_palette_entry_get_color (palette, pal_entry, &color_sample);
pika_rgb_get_pixel (&color_sample,
format,
d_samp);
}
return d_samples;
}