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- /* The GIMP -- an image manipulation program
- * Copyright (C) 1999 Manish Singh <yosh@gimp.org>
- *
- * 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 "config.h"
- #include <string.h>
- #include <gtk/gtk.h>
- #include "app/dialog_handler.h"
- #include "gimpmodregister.h"
- #include <libgimp/gimpcolordisplay.h>
- #include <libgimp/gimpmodule.h>
- #include <libgimp/gimpparasite.h>
- #include <libgimp/gimpui.h>
- #include <libgimp/gimpmath.h>
- #include "libgimp/gimpintl.h"
- #define COLOR_DISPLAY_NAME _("High Contrast")
- typedef struct _ContrastContext ContrastContext;
- struct _ContrastContext
- {
- GFunc ok_func;
- gpointer ok_data;
- GFunc cancel_func;
- gpointer cancel_data;
- gdouble contrast;
- guchar *lookup;
- GtkWidget *shell;
- GtkWidget *spinner;
- };
- static gpointer contrast_new (gint type);
- static gpointer contrast_clone (gpointer cd_ID);
- static void contrast_create_lookup_table (ContrastContext *context);
- static void contrast_destroy (gpointer cd_ID);
- static void contrast_convert (gpointer cd_ID,
- guchar *buf,
- gint w,
- gint h,
- gint bpp,
- gint bpl);
- static void contrast_load (gpointer cd_ID,
- GimpParasite *state);
- static GimpParasite * contrast_save (gpointer cd_ID);
- static void contrast_configure_ok_callback (GtkWidget *widget,
- gpointer data);
- static void contrast_configure_cancel_callback (GtkWidget *widget,
- gpointer data);
- static void contrast_configure (gpointer cd_ID,
- GFunc ok_func,
- gpointer ok_data,
- GFunc cancel_func,
- gpointer cancel_data);
- static void contrast_configure_cancel (gpointer cd_ID);
- static GimpColorDisplayMethods methods =
- {
- NULL,
- contrast_new,
- contrast_clone,
- contrast_convert,
- contrast_destroy,
- NULL,
- contrast_load,
- contrast_save,
- contrast_configure,
- contrast_configure_cancel
- };
- static GimpModuleInfo info =
- {
- NULL,
- N_("High Contrast color display filter"),
- "Jay Cox <jaycox@earthlink.net>",
- "v0.2",
- "(c) 2000, released under the GPL",
- "October 14, 2000"
- };
- G_MODULE_EXPORT GimpModuleStatus
- module_init (GimpModuleInfo **inforet)
- {
- #ifndef __EMX__
- if (gimp_color_display_register (COLOR_DISPLAY_NAME, &methods))
- #else
- if (mod_color_display_register (COLOR_DISPLAY_NAME, &methods))
- #endif
- {
- *inforet = &info;
- return GIMP_MODULE_OK;
- }
- else
- return GIMP_MODULE_UNLOAD;
- }
- G_MODULE_EXPORT void
- module_unload (void *shutdown_data,
- void (*completed_cb) (void *),
- void *completed_data)
- {
- #ifndef __EMX__
- gimp_color_display_unregister (COLOR_DISPLAY_NAME);
- #else
- mod_color_display_unregister (COLOR_DISPLAY_NAME);
- #endif
- }
- static gpointer
- contrast_new (gint type)
- {
- ContrastContext *context;
- context = g_new0 (ContrastContext, 1);
- context->contrast = 4.0;
- context->lookup = g_new (guchar, 256);
- contrast_create_lookup_table (context);
- return context;
- }
- static gpointer
- contrast_clone (gpointer cd_ID)
- {
- ContrastContext *src_context = cd_ID;
- ContrastContext *context;
- context = contrast_new (0);
- context->contrast = src_context->contrast;
-
- memcpy (context->lookup, src_context->lookup, sizeof (guchar) * 256);
- return context;
- }
- static void
- contrast_create_lookup_table (ContrastContext *context)
- {
- gint i;
- if (context->contrast == 0.0)
- context->contrast = 1.0;
- for (i = 0; i < 256; i++)
- {
- context->lookup[i]
- = (guchar) (int)(255 * .5 * (1 + sin(context->contrast*2*G_PI*i/255.0)));
- }
- }
- static void
- contrast_destroy (gpointer cd_ID)
- {
- ContrastContext *context = cd_ID;
- if (context->shell)
- {
- dialog_unregister (context->shell);
- gtk_widget_destroy (context->shell);
- }
- g_free (context->lookup);
- g_free (context);
- }
- static void
- contrast_convert (gpointer cd_ID,
- guchar *buf,
- gint width,
- gint height,
- gint bpp,
- gint bpl)
- {
- guchar *lookup = ((ContrastContext *) cd_ID)->lookup;
- gint i, j = height;
- /* You will not be using the entire buffer most of the time.
- * Hence, the simplistic code for this is as follows:
- *
- * for (j = 0; j < height; j++)
- * {
- * for (i = 0; i < width * bpp; i++)
- * buf[i] = lookup[buf[i]];
- * buf += bpl;
- * }
- */
- width *= bpp;
- bpl -= width;
- while (j--)
- {
- i = width;
- while (i--)
- {
- *buf = lookup[*buf];
- buf++;
- }
- buf += bpl;
- }
- }
- static void
- contrast_load (gpointer cd_ID,
- GimpParasite *state)
- {
- ContrastContext *context = cd_ID;
- #if G_BYTE_ORDER == G_BIG_ENDIAN
- memcpy (&context->contrast, gimp_parasite_data (state), sizeof (gdouble));
- #else
- guint32 buf[2], *data = gimp_parasite_data (state);
- buf[0] = g_ntohl (data[1]);
- buf[1] = g_ntohl (data[0]);
- memcpy (&context->contrast, buf, sizeof (gdouble));
- #endif
- contrast_create_lookup_table (context);
- }
- static GimpParasite *
- contrast_save (gpointer cd_ID)
- {
- ContrastContext *context = cd_ID;
- guint32 buf[2];
- memcpy (buf, &context->contrast, sizeof (gdouble));
- #if G_BYTE_ORDER == G_LITTLE_ENDIAN
- {
- guint32 tmp = g_htonl (buf[0]);
- buf[0] = g_htonl (buf[1]);
- buf[1] = tmp;
- }
- #endif
- return gimp_parasite_new ("Display/Contrast", GIMP_PARASITE_PERSISTENT,
- sizeof (gdouble), &buf);
- }
- static void
- contrast_configure_ok_callback (GtkWidget *widget,
- gpointer data)
- {
- ContrastContext *context = data;
- context->contrast = gtk_spin_button_get_value_as_float (GTK_SPIN_BUTTON (context->spinner));
- contrast_create_lookup_table (context);
- dialog_unregister (context->shell);
- gtk_widget_destroy (GTK_WIDGET (context->shell));
- context->shell = NULL;
- if (context->ok_func)
- context->ok_func (context, context->ok_data);
- }
- static void
- contrast_configure_cancel_callback (GtkWidget *widget,
- gpointer data)
- {
- ContrastContext *context = data;
- dialog_unregister (context->shell);
- gtk_widget_destroy (GTK_WIDGET (context->shell));
- context->shell = NULL;
- if (context->cancel_func)
- context->cancel_func (context, context->cancel_data);
- }
- static void
- contrast_configure (gpointer cd_ID,
- GFunc ok_func,
- gpointer ok_data,
- GFunc cancel_func,
- gpointer cancel_data)
- {
- ContrastContext *context = cd_ID;
- GtkWidget *hbox;
- GtkWidget *label;
- GtkObject *adjustment;
- if (!context->shell)
- {
- context->ok_func = ok_func;
- context->ok_data = ok_data;
- context->cancel_func = cancel_func;
- context->cancel_data = cancel_data;
- context->shell =
- gimp_dialog_new (_("High Contrast"), "high contrast",
- gimp_standard_help_func, "modules/highcontrast.html",
- GTK_WIN_POS_MOUSE,
- FALSE, TRUE, FALSE,
- _("OK"), contrast_configure_ok_callback,
- cd_ID, NULL, NULL, TRUE, FALSE,
- _("Cancel"), contrast_configure_cancel_callback,
- cd_ID, NULL, NULL, FALSE, TRUE,
- NULL);
- dialog_register (context->shell);
- hbox = gtk_hbox_new (FALSE, 2);
- gtk_container_set_border_width (GTK_CONTAINER (hbox), 6);
- gtk_box_pack_start (GTK_BOX (GTK_DIALOG (context->shell)->vbox),
- hbox, FALSE, FALSE, 0);
- label = gtk_label_new ( _("Contrast Cycles:"));
- gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
- gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, TRUE, 0);
- adjustment = gtk_adjustment_new (context->contrast, 1.0, 20.0, 0.5, 1.0, 0.0);
- context->spinner = gtk_spin_button_new (GTK_ADJUSTMENT (adjustment),
- 0.1, 3);
- gtk_widget_set_usize (context->spinner, 100, 0);
- gtk_box_pack_start (GTK_BOX (hbox), context->spinner, FALSE, FALSE, 0);
- }
- gtk_widget_show_all (context->shell);
- }
- static void
- contrast_configure_cancel (gpointer cd_ID)
- {
- ContrastContext *context = cd_ID;
-
- if (context->shell)
- {
- dialog_unregister (context->shell);
- gtk_widget_destroy (context->shell);
- context->shell = NULL;
- }
- if (context->cancel_func)
- context->cancel_func (context, context->cancel_data);
- }
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