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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 <http://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 NSAMPLES 256
#define LUMINOSITY(X) (GIMP_RGB_LUMINANCE (X[0], X[1], X[2]) + 0.5)
typedef enum
{
GRADIENT_MODE = 1,
PALETTE_MODE
} MapMode;
/* Declare a local function.
*/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void map (GimpDrawable *drawable,
MapMode mode);
static guchar * get_samples_gradient (GimpDrawable *drawable);
static guchar * get_samples_palette (GimpDrawable *drawable);
static void map_func (const guchar *src,
guchar *dest,
gint bpp,
gpointer data);
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];
GimpDrawable *drawable;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
GimpRunMode run_mode;
run_mode = param[0].data.d_int32;
INIT_I18N();
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
/* Get the specified drawable */
drawable = gimp_drawable_get (param[2].data.d_drawable);
/* Make sure that the drawable is gray or RGB color */
if (gimp_drawable_is_rgb (drawable->drawable_id) ||
gimp_drawable_is_gray (drawable->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 (drawable, mode);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
}
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
typedef struct
{
guchar *samples;
gboolean is_rgb;
gboolean has_alpha;
MapMode mode;
} MapParam;
static void
map_func (const guchar *src,
guchar *dest,
gint bpp,
gpointer data)
{
MapParam *param = data;
gint lum;
gint b;
guchar *samp;
lum = (param->is_rgb) ? LUMINOSITY (src) : src[0];
samp = &param->samples[lum * bpp];
if (param->has_alpha)
{
for (b = 0; b < bpp - 1; b++)
dest[b] = samp[b];
dest[b] = ((guint)samp[b] * (guint)src[b]) / 255;
}
else
{
for (b = 0; b < bpp; b++)
dest[b] = samp[b];
}
}
static void
map (GimpDrawable *drawable,
MapMode mode)
{
MapParam param;
param.is_rgb = gimp_drawable_is_rgb (drawable->drawable_id);
param.has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
switch (mode)
{
case GRADIENT_MODE:
param.samples = get_samples_gradient (drawable);
break;
case PALETTE_MODE:
param.samples = get_samples_palette (drawable);
break;
default:
g_error ("plug_in_gradmap: invalid mode");
}
gimp_rgn_iterate2 (drawable, 0 /* unused */, map_func, &param);
}
/*
Returns 256 samples of active gradient.
Each sample has (gimp_drawable_bpp (drawable->drawable_id)) bytes.
*/
static guchar *
get_samples_gradient (GimpDrawable *drawable)
{
gchar *gradient_name;
gint n_f_samples;
gdouble *f_samples, *f_samp; /* float samples */
guchar *byte_samples, *b_samp; /* byte samples */
gint bpp, color, has_alpha, alpha;
gint i, j;
gradient_name = gimp_context_get_gradient ();
/* FIXME: "reverse" hardcoded to FALSE. */
gimp_gradient_get_uniform_samples (gradient_name, NSAMPLES, FALSE,
&n_f_samples, &f_samples);
bpp = gimp_drawable_bpp (drawable->drawable_id);
color = gimp_drawable_is_rgb (drawable->drawable_id);
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
alpha = (has_alpha ? bpp - 1 : bpp);
byte_samples = g_new (guchar, NSAMPLES * bpp);
for (i = 0; i < NSAMPLES; i++)
{
b_samp = &byte_samples[i * bpp];
f_samp = &f_samples[i * 4];
if (color)
for (j = 0; j < 3; j++)
b_samp[j] = f_samp[j] * 255;
else
b_samp[0] = LUMINOSITY (f_samp) * 255;
if (has_alpha)
b_samp[alpha] = f_samp[3] * 255;
}
g_free (f_samples);
return byte_samples;
}
/*
Returns 256 samples of the palette.
Each sample has (gimp_drawable_bpp (drawable->drawable_id)) bytes.
*/
static guchar *
get_samples_palette (GimpDrawable *drawable)
{
gchar *palette_name;
GimpRGB color_sample;
guchar *byte_samples;
guchar *b_samp;
gint bpp, color, has_alpha, alpha;
gint i;
gint num_colors;
gfloat factor;
gint pal_entry;
palette_name = gimp_context_get_palette ();
gimp_palette_get_info (palette_name, &num_colors);
bpp = gimp_drawable_bpp (drawable->drawable_id);
color = gimp_drawable_is_rgb (drawable->drawable_id);
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
alpha = (has_alpha ? bpp - 1 : bpp);
byte_samples = g_new (guchar, NSAMPLES * bpp);
factor = ( (float) num_colors) / NSAMPLES;
for (i = 0; i < NSAMPLES; i++)
{
b_samp = &byte_samples[i * bpp];
pal_entry = CLAMP( (int)(i * factor), 0, num_colors);
gimp_palette_entry_get_color (palette_name, pal_entry, &color_sample);
if (color)
gimp_rgb_get_uchar (&color_sample,
b_samp, b_samp + 1, b_samp + 2);
else
*b_samp = gimp_rgb_luminance_uchar (&color_sample);
if (has_alpha)
b_samp[alpha] = 255;
}
return byte_samples;
}
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