488 lines
15 KiB
C
488 lines
15 KiB
C
/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* Gradient Map plug-in
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* Copyright (C) 1997 Eiichi Takamori <taka@ma1.seikyou.ne.jp>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <string.h>
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#include <libpika/pika.h>
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#include "libpika/stdplugins-intl.h"
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/* Some useful macros */
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#define GRADMAP_PROC "plug-in-gradmap"
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#define PALETTEMAP_PROC "plug-in-palettemap"
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#define PLUG_IN_BINARY "gradient-map"
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#define PLUG_IN_ROLE "pika-gradient-map"
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#define NSAMPLES 2048
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typedef enum
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{
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GRADIENT_MODE = 1,
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PALETTE_MODE
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} MapMode;
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typedef struct _Map Map;
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typedef struct _MapClass MapClass;
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struct _Map
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{
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PikaPlugIn parent_instance;
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};
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struct _MapClass
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{
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PikaPlugInClass parent_class;
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};
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#define MAP_TYPE (map_get_type ())
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#define MAP (obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), MAP_TYPE, Map))
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GType map_get_type (void) G_GNUC_CONST;
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static GList * map_query_procedures (PikaPlugIn *plug_in);
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static PikaProcedure * map_create_procedure (PikaPlugIn *plug_in,
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const gchar *name);
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static PikaValueArray * map_run (PikaProcedure *procedure,
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PikaRunMode run_mode,
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PikaImage *image,
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gint n_drawables,
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PikaDrawable **drawables,
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const PikaValueArray *args,
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gpointer run_data);
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static void map (GeglBuffer *buffer,
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GeglBuffer *shadow_buffer,
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PikaDrawable *drawable,
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MapMode mode);
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static gdouble * get_samples_gradient (PikaDrawable *drawable);
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static gdouble * get_samples_palette (PikaDrawable *drawable);
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G_DEFINE_TYPE (Map, map, PIKA_TYPE_PLUG_IN)
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PIKA_MAIN (MAP_TYPE)
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DEFINE_STD_SET_I18N
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static void
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map_class_init (MapClass *klass)
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{
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PikaPlugInClass *plug_in_class = PIKA_PLUG_IN_CLASS (klass);
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plug_in_class->query_procedures = map_query_procedures;
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plug_in_class->create_procedure = map_create_procedure;
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plug_in_class->set_i18n = STD_SET_I18N;
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}
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static void
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map_init (Map *map)
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{
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}
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static GList *
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map_query_procedures (PikaPlugIn *plug_in)
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{
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GList *list = NULL;
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list = g_list_append (list, g_strdup (GRADMAP_PROC));
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list = g_list_append (list, g_strdup (PALETTEMAP_PROC));
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return list;
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}
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static PikaProcedure *
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map_create_procedure (PikaPlugIn *plug_in,
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const gchar *name)
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{
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PikaProcedure *procedure = NULL;
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if (! strcmp (name, GRADMAP_PROC))
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{
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procedure = pika_image_procedure_new (plug_in, name,
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PIKA_PDB_PROC_TYPE_PLUGIN,
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map_run,
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GINT_TO_POINTER (GRADIENT_MODE),
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NULL);
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pika_procedure_set_image_types (procedure, "RGB*, GRAY*");
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pika_procedure_set_sensitivity_mask (procedure,
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PIKA_PROCEDURE_SENSITIVE_DRAWABLE);
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pika_procedure_set_menu_label (procedure, _("_Gradient Map"));
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pika_procedure_add_menu_path (procedure, "<Image>/Colors/Map");
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pika_procedure_set_documentation (procedure,
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_("Recolor the image using colors "
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"from the active gradient"),
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"This plug-in maps the contents of "
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"the specified drawable with active "
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"gradient. It calculates luminosity "
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"of each pixel and replaces the pixel "
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"by the sample of active gradient at "
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"the position proportional to that "
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"luminosity. Complete black pixel "
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"becomes the leftmost color of the "
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"gradient, and complete white becomes "
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"the rightmost. Works on both "
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"Grayscale and RGB image "
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"with/without alpha channel.",
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name);
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pika_procedure_set_attribution (procedure,
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"Eiichi Takamori",
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"Eiichi Takamori",
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"1997");
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}
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else if (! strcmp (name, PALETTEMAP_PROC))
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{
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procedure = pika_image_procedure_new (plug_in, name,
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PIKA_PDB_PROC_TYPE_PLUGIN,
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map_run,
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GINT_TO_POINTER (PALETTE_MODE),
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NULL);
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pika_procedure_set_image_types (procedure, "RGB*, GRAY*");
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pika_procedure_set_sensitivity_mask (procedure,
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PIKA_PROCEDURE_SENSITIVE_DRAWABLE);
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pika_procedure_set_menu_label (procedure, _("_Palette Map"));
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pika_procedure_add_menu_path (procedure, "<Image>/Colors/Map");
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pika_procedure_set_documentation (procedure,
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_("Recolor the image using colors "
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"from the active palette"),
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"This plug-in maps the contents of "
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"the specified drawable with the "
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"active palette. It calculates "
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"luminosity of each pixel and "
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"replaces the pixel by the palette "
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"sample at the corresponding index. "
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"A complete black pixel becomes the "
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"lowest palette entry, and complete "
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"white becomes the highest. Works on "
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"both Grayscale and RGB image "
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"with/without alpha channel.",
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name);
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pika_procedure_set_attribution (procedure,
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"Bill Skaggs",
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"Bill Skaggs",
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"2004");
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}
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return procedure;
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}
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static PikaValueArray *
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map_run (PikaProcedure *procedure,
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PikaRunMode run_mode,
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PikaImage *image,
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gint n_drawables,
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PikaDrawable **drawables,
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const PikaValueArray *args,
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gpointer run_data)
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{
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MapMode mode = GPOINTER_TO_INT (run_data);
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GeglBuffer *shadow_buffer;
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GeglBuffer *buffer;
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PikaDrawable *drawable;
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gegl_init (NULL, NULL);
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if (n_drawables != 1)
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{
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GError *error = NULL;
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g_set_error (&error, PIKA_PLUG_IN_ERROR, 0,
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_("Procedure '%s' only works with one drawable."),
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pika_procedure_get_name (procedure));
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return pika_procedure_new_return_values (procedure,
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PIKA_PDB_CALLING_ERROR,
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error);
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}
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else
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{
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drawable = drawables[0];
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}
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shadow_buffer = pika_drawable_get_shadow_buffer (drawable);
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buffer = pika_drawable_get_buffer (drawable);
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/* Make sure that the drawable is gray or RGB color */
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if (pika_drawable_is_rgb (drawable) ||
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pika_drawable_is_gray (drawable))
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{
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if (mode == GRADIENT_MODE)
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{
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pika_progress_init (_("Gradient Map"));
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}
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else
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{
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pika_progress_init (_("Palette Map"));
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}
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map (buffer, shadow_buffer, drawable, mode);
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}
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else
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{
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return pika_procedure_new_return_values (procedure,
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PIKA_PDB_EXECUTION_ERROR,
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NULL);
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}
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g_object_unref (buffer);
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g_object_unref (shadow_buffer);
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pika_drawable_merge_shadow (drawable, TRUE);
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pika_drawable_update (drawable, 0, 0,
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pika_drawable_get_width (drawable),
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pika_drawable_get_height (drawable));
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if (run_mode != PIKA_RUN_NONINTERACTIVE)
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pika_displays_flush ();
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return pika_procedure_new_return_values (procedure, PIKA_PDB_SUCCESS, NULL);
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}
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static void
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map (GeglBuffer *buffer,
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GeglBuffer *shadow_buffer,
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PikaDrawable *drawable,
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MapMode mode)
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{
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GeglBufferIterator *gi;
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gint nb_color_chan;
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gint nb_chan;
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gint nb_chan2;
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gint nb_chan_samp;
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gint index_iter;
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gboolean interpolate;
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gdouble *samples;
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gboolean is_rgb;
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gboolean has_alpha;
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const Babl *format_shadow;
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const Babl *format_buffer;
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is_rgb = pika_drawable_is_rgb (drawable);
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has_alpha = pika_drawable_has_alpha (drawable);
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switch (mode)
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{
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case GRADIENT_MODE:
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samples = get_samples_gradient (drawable);
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interpolate = TRUE;
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break;
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case PALETTE_MODE:
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samples = get_samples_palette (drawable);
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interpolate = FALSE;
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break;
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default:
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g_error ("plug_in_gradmap: invalid mode");
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}
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if (is_rgb)
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{
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nb_color_chan = 3;
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nb_chan_samp = 4;
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if (has_alpha)
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format_shadow = babl_format ("R'G'B'A float");
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else
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format_shadow = babl_format ("R'G'B' float");
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}
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else
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{
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nb_color_chan = 1;
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nb_chan_samp = 2;
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if (has_alpha)
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format_shadow = babl_format ("Y'A float");
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else
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format_shadow = babl_format ("Y' float");
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}
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if (has_alpha)
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{
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nb_chan = nb_color_chan + 1;
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nb_chan2 = 2;
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format_buffer = babl_format ("Y'A float");
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}
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else
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{
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nb_chan = nb_color_chan;
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nb_chan2 = 1;
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format_buffer = babl_format ("Y' float");
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}
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gi = gegl_buffer_iterator_new (shadow_buffer, NULL, 0, format_shadow,
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GEGL_ACCESS_WRITE, GEGL_ABYSS_NONE, 2);
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index_iter = gegl_buffer_iterator_add (gi, buffer, NULL,
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0, format_buffer,
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GEGL_ACCESS_READ, GEGL_ABYSS_NONE);
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while (gegl_buffer_iterator_next (gi))
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{
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guint k;
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gfloat *data;
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gfloat *data2;
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data = (gfloat*) gi->items[0].data;
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data2 = (gfloat*) gi->items[index_iter].data;
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if (interpolate)
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{
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for (k = 0; k < gi->length; k++)
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{
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gint b, ind1, ind2;
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gdouble *samp1, *samp2;
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gfloat c1, c2, val;
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val = data2[0] * (NSAMPLES-1);
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ind1 = CLAMP (floor (val), 0, NSAMPLES-1);
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ind2 = CLAMP (ceil (val), 0, NSAMPLES-1);
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c1 = 1.0 - (val - ind1);
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c2 = 1.0 - c1;
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samp1 = &(samples[ind1 * nb_chan_samp]);
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samp2 = &(samples[ind2 * nb_chan_samp]);
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for (b = 0; b < nb_color_chan; b++)
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data[b] = (samp1[b] * c1 + samp2[b] * c2);
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if (has_alpha)
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{
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float alpha = (samp1[b] * c1 + samp2[b] * c2);
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data[b] = alpha * data2[1];
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}
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data += nb_chan;
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data2 += nb_chan2;
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}
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}
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else
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{
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for (k = 0; k < gi->length; k++)
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{
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gint b, ind;
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gdouble *samp;
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ind = CLAMP (data2[0] * (NSAMPLES-1), 0, NSAMPLES-1);
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samp = &(samples[ind * nb_chan_samp]);
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for (b = 0; b < nb_color_chan; b++)
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data[b] = samp[b];
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if (has_alpha)
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{
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data[b] = samp[b] * data2[1];
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}
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data += nb_chan;
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data2 += nb_chan2;
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}
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}
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}
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g_free (samples);
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}
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/*
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Returns 2048 samples of the gradient.
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Each sample is (R'G'B'A float) or (Y'A float), depending on the drawable
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*/
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static gdouble *
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get_samples_gradient (PikaDrawable *drawable)
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{
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PikaGradient *gradient;
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gint n_d_samples;
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gdouble *d_samples = NULL;
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gradient = pika_context_get_gradient ();
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/* FIXME: "reverse" hardcoded to FALSE. */
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pika_gradient_get_uniform_samples (gradient, NSAMPLES, FALSE,
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&n_d_samples, &d_samples);
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if (! pika_drawable_is_rgb (drawable))
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{
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const Babl *format_src = babl_format ("R'G'B'A double");
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const Babl *format_dst = babl_format ("Y'A double");
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const Babl *fish = babl_fish (format_src, format_dst);
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babl_process (fish, d_samples, d_samples, NSAMPLES);
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}
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return d_samples;
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}
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/*
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Returns 2048 samples of the palette.
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Each sample is (R'G'B'A float) or (Y'A float), depending on the drawable
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*/
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static gdouble *
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get_samples_palette (PikaDrawable *drawable)
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{
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PikaPalette *palette;
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PikaRGB color_sample;
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gdouble *d_samples, *d_samp;
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gboolean is_rgb;
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gdouble factor;
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gint pal_entry, num_colors;
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gint nb_color_chan, nb_chan, i;
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const Babl *format;
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palette = pika_context_get_palette ();
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num_colors = pika_palette_get_color_count (palette);
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is_rgb = pika_drawable_is_rgb (drawable);
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factor = ((double) num_colors) / NSAMPLES;
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format = is_rgb ? babl_format ("R'G'B'A double") : babl_format ("Y'A double");
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nb_color_chan = is_rgb ? 3 : 1;
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nb_chan = nb_color_chan + 1;
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d_samples = g_new (gdouble, NSAMPLES * nb_chan);
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for (i = 0; i < NSAMPLES; i++)
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{
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d_samp = &d_samples[i * nb_chan];
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pal_entry = CLAMP ((int)(i * factor), 0, num_colors - 1);
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pika_palette_entry_get_color (palette, pal_entry, &color_sample);
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pika_rgb_get_pixel (&color_sample,
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format,
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d_samp);
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}
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return d_samples;
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}
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