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Diffstat (limited to 'plug-ins/common/gradient-map.c')
| -rw-r--r-- | plug-ins/common/gradient-map.c | 412 |
1 files changed, 412 insertions, 0 deletions
diff --git a/plug-ins/common/gradient-map.c b/plug-ins/common/gradient-map.c new file mode 100644 index 0000000..94c3f00 --- /dev/null +++ b/plug-ins/common/gradient-map.c @@ -0,0 +1,412 @@ +/* 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; +} |