gimp/app/colormaps.c

257 lines
6.4 KiB
C

/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdlib.h>
#include <math.h>
#include "appenv.h"
#include "app_procs.h"
#include "brushes.h"
#include "colormaps.h"
#include "errors.h"
#include "general.h"
#include "gimprc.h"
#include "gradient.h"
#include "palette.h"
#include "patterns.h"
#include "plug_in.h"
#include "temp_buf.h"
#include "tile_swap.h"
GdkVisual *g_visual = NULL;
GdkColormap *g_cmap = NULL;
gulong g_black_pixel;
gulong g_gray_pixel;
gulong g_white_pixel;
gulong g_color_pixel;
gulong g_normal_guide_pixel;
gulong g_active_guide_pixel;
gulong foreground_pixel;
gulong background_pixel;
gulong old_color_pixel;
gulong new_color_pixel;
gulong marching_ants_pixels[8];
GtkDitherInfo *red_ordered_dither;
GtkDitherInfo *green_ordered_dither;
GtkDitherInfo *blue_ordered_dither;
GtkDitherInfo *gray_ordered_dither;
guchar ***ordered_dither_matrix;
/* These arrays are calculated for quick 24 bit to 16 color conversions */
gulong *g_lookup_red;
gulong *g_lookup_green;
gulong *g_lookup_blue;
gulong *color_pixel_vals;
gulong *gray_pixel_vals;
static int reserved_entries = 4; /* extra colors aside from color cube */
static gulong *reserved_pixels;
static void make_color (gulong *pixel_ptr,
int red,
int green,
int blue,
int readwrite);
static void
set_app_colors ()
{
int i;
if ((g_visual->type == GDK_VISUAL_PSEUDO_COLOR) ||
(g_visual->type == GDK_VISUAL_GRAYSCALE))
{
foreground_pixel = reserved_pixels[0];
background_pixel = reserved_pixels[1];
old_color_pixel = reserved_pixels[2];
new_color_pixel = reserved_pixels[3];
}
else
{
cycled_marching_ants = FALSE;
}
make_color (&g_black_pixel, 0, 0, 0, FALSE);
make_color (&g_gray_pixel, 127, 127, 127, FALSE);
make_color (&g_white_pixel, 255, 255, 255, FALSE);
make_color (&g_color_pixel, 255, 255, 0, FALSE);
make_color (&g_normal_guide_pixel, 0, 127, 255, FALSE);
make_color (&g_active_guide_pixel, 255, 0, 0, FALSE);
store_color (&foreground_pixel, 0, 0, 0);
store_color (&background_pixel, 255, 255, 255);
store_color (&old_color_pixel, 0, 0, 0);
store_color (&new_color_pixel, 255, 255, 255);
/* marching ants pixels--if enabled */
if (cycled_marching_ants)
for (i = 0; i < 8; i++)
{
marching_ants_pixels[i] = reserved_pixels[i + reserved_entries - 8];
if (i < 4)
store_color (&marching_ants_pixels[i], 0, 0, 0);
else
store_color (&marching_ants_pixels[i], 255, 255, 255);
}
}
static unsigned int
gamma_correct (int intensity, double gamma)
{
unsigned int val;
double ind;
double one_over_gamma;
if (gamma != 0.0)
one_over_gamma = 1.0 / gamma;
else
one_over_gamma = 1.0;
ind = (double) intensity / 256.0;
val = (int) (256 * pow (ind, one_over_gamma));
return val;
}
/*************************************************************************/
gulong
get_color (int red,
int green,
int blue)
{
gulong pixel;
if ((g_visual->type == GDK_VISUAL_PSEUDO_COLOR) ||
(g_visual->type == GDK_VISUAL_GRAYSCALE))
pixel = color_pixel_vals [(red_ordered_dither[red].s[1] +
green_ordered_dither[green].s[1] +
blue_ordered_dither[blue].s[1])];
else
store_color (&pixel, red, green, blue);
return pixel;
}
static void
make_color (gulong *pixel_ptr,
int red,
int green,
int blue,
int readwrite)
{
GdkColor col;
red = gamma_correct (red, gamma_val);
green = gamma_correct (green, gamma_val);
blue = gamma_correct (blue, gamma_val);
col.red = red * (65535 / 255);
col.green = green * (65535 / 255);
col.blue = blue * (65535 / 255);
col.pixel = *pixel_ptr;
if (readwrite && ((g_visual->type == GDK_VISUAL_PSEUDO_COLOR) ||
(g_visual->type == GDK_VISUAL_GRAYSCALE)))
gdk_color_change (g_cmap, &col);
else
gdk_color_alloc (g_cmap, &col);
*pixel_ptr = col.pixel;
}
void
store_color (gulong *pixel_ptr,
int red,
int green,
int blue)
{
make_color (pixel_ptr, red, green, blue, TRUE);
}
void
get_standard_colormaps ()
{
GtkPreviewInfo *info;
if (cycled_marching_ants)
reserved_entries += 8;
gtk_preview_set_gamma (gamma_val);
gtk_preview_set_color_cube (color_cube_shades[0], color_cube_shades[1],
color_cube_shades[2], color_cube_shades[3]);
gtk_preview_set_install_cmap (install_cmap);
gtk_preview_set_reserved (reserved_entries);
/* so we can reinit the colormaps */
gtk_preview_reset ();
gtk_widget_set_default_visual (gtk_preview_get_visual ());
gtk_widget_set_default_colormap (gtk_preview_get_cmap ());
info = gtk_preview_get_info ();
g_visual = info->visual;
if (((g_visual->type == GDK_VISUAL_PSEUDO_COLOR) ||
(g_visual->type == GDK_VISUAL_GRAYSCALE)) &&
info->reserved_pixels == NULL) {
g_print("GIMP cannot get enough colormaps to boot.\n");
g_print("Try exiting other color intensive applications.\n");
g_print("Also try enabling the (install-colormap) option in gimprc.\n");
swapping_free ();
brushes_free ();
patterns_free ();
palettes_free ();
gradients_free ();
palette_free ();
procedural_db_free ();
plug_in_kill ();
tile_swap_exit ();
gtk_exit(0);
}
g_cmap = info->cmap;
color_pixel_vals = info->color_pixels;
gray_pixel_vals = info->gray_pixels;
reserved_pixels = info->reserved_pixels;
red_ordered_dither = info->dither_red;
green_ordered_dither = info->dither_green;
blue_ordered_dither = info->dither_blue;
gray_ordered_dither = info->dither_gray;
ordered_dither_matrix = info->dither_matrix;
g_lookup_red = info->lookup_red;
g_lookup_green = info->lookup_green;
g_lookup_blue = info->lookup_blue;
set_app_colors ();
}