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

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/* GIMP - The GNU Image Manipulation Program
* 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 <libgimp/gimp.h>
#include "libgimp/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 "gimp-gradient-map"
#define NSAMPLES 2048
typedef enum
{
GRADIENT_MODE = 1,
PALETTE_MODE
} MapMode;
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void map (GeglBuffer *buffer,
GeglBuffer *shadow_buffer,
gint32 drawable_id,
MapMode mode);
static gdouble * get_samples_gradient (gint32 drawable_id);
static gdouble * get_samples_palette (gint32 drawable_id);
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
MAIN ()
static void
query (void)
{
static const GimpParamDef args[]=
{
{ GIMP_PDB_INT32, "run-mode", "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
{ GIMP_PDB_IMAGE, "image", "Input image (unused)" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" }
};
gimp_install_procedure (GRADMAP_PROC,
N_("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.",
"Eiichi Takamori",
"Eiichi Takamori",
"1997",
N_("_Gradient Map"),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (GRADMAP_PROC, "<Image>/Colors/Map");
gimp_install_procedure (PALETTEMAP_PROC,
N_("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.",
"Bill Skaggs",
"Bill Skaggs",
"2004",
N_("_Palette Map"),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PALETTEMAP_PROC, "<Image>/Colors/Map");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
GimpRunMode run_mode;
gint32 drawable_id;
GeglBuffer *shadow_buffer;
GeglBuffer *buffer;
run_mode = param[0].data.d_int32;
drawable_id = param[2].data.d_drawable;
INIT_I18N ();
gegl_init (NULL, NULL);
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
/* Get the specified drawable */
shadow_buffer = gimp_drawable_get_shadow_buffer (drawable_id);
buffer = gimp_drawable_get_buffer (drawable_id);
/* Make sure that the drawable is gray or RGB color */
if (gimp_drawable_is_rgb (drawable_id) ||
gimp_drawable_is_gray (drawable_id))
{
MapMode mode = 0;
if ( !strcmp (name, GRADMAP_PROC))
{
mode = GRADIENT_MODE;
gimp_progress_init (_("Gradient Map"));
}
else if ( !strcmp (name, PALETTEMAP_PROC))
{
mode = PALETTE_MODE;
gimp_progress_init (_("Palette Map"));
}
else
{
status = GIMP_PDB_CALLING_ERROR;
}
if (status == GIMP_PDB_SUCCESS)
{
if (mode)
map (buffer, shadow_buffer, drawable_id, mode);
}
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
}
g_object_unref (buffer);
g_object_unref (shadow_buffer);
gimp_drawable_merge_shadow (drawable_id, TRUE);
gimp_drawable_update (drawable_id, 0, 0,
gimp_drawable_width (drawable_id),
gimp_drawable_height (drawable_id));
values[0].data.d_status = status;
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
}
static void
map (GeglBuffer *buffer,
GeglBuffer *shadow_buffer,
gint32 drawable_id,
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 = gimp_drawable_is_rgb (drawable_id);
has_alpha = gimp_drawable_has_alpha (drawable_id);
switch (mode)
{
case GRADIENT_MODE:
samples = get_samples_gradient (drawable_id);
interpolate = TRUE;
break;
case PALETTE_MODE:
samples = get_samples_palette (drawable_id);
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 (gint32 drawable_id)
{
gchar *gradient_name;
gint n_d_samples;
gdouble *d_samples = NULL;
gradient_name = gimp_context_get_gradient ();
/* FIXME: "reverse" hardcoded to FALSE. */
gimp_gradient_get_uniform_samples (gradient_name, NSAMPLES, FALSE,
&n_d_samples, &d_samples);
g_free (gradient_name);
if (!gimp_drawable_is_rgb (drawable_id))
{
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 (gint32 drawable_id)
{
gchar *palette_name;
GimpRGB 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_name = gimp_context_get_palette ();
gimp_palette_get_info (palette_name, &num_colors);
is_rgb = gimp_drawable_is_rgb (drawable_id);
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);
gimp_palette_entry_get_color (palette_name, pal_entry, &color_sample);
gimp_rgb_get_pixel (&color_sample,
format,
d_samp);
}
g_free (palette_name);
return d_samples;
}
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