mirror of https://github.com/GNOME/gimp.git
540 lines
13 KiB
C
540 lines
13 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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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 2 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "appenv.h"
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#include "drawable.h"
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#include "general.h"
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#include "gdisplay.h"
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#include "gimpui.h"
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#include "interface.h"
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#include "threshold.h"
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#include "libgimp/gimpintl.h"
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#define HISTOGRAM_WIDTH 256
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#define HISTOGRAM_HEIGHT 150
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#define LOW 0x1
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#define HIGH 0x2
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#define HISTORGAM 0x4
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#define ALL (LOW | HIGH | HISTOGRAM)
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/* the threshold structures */
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typedef struct _Threshold Threshold;
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struct _Threshold
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{
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gint x, y; /* coords for last mouse click */
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};
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/* the threshold tool options */
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static ToolOptions *threshold_options = NULL;
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/* the threshold tool dialog */
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static ThresholdDialog *threshold_dialog = NULL;
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/* threshold action functions */
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static void threshold_control (Tool *, ToolAction, gpointer);
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static ThresholdDialog * threshold_dialog_new (void);
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static void threshold_update (ThresholdDialog *,
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gint);
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static void threshold_preview (ThresholdDialog *);
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static void threshold_reset_callback (GtkWidget *, gpointer);
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static void threshold_ok_callback (GtkWidget *, gpointer);
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static void threshold_cancel_callback (GtkWidget *, gpointer);
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static void threshold_preview_update (GtkWidget *, gpointer);
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static void threshold_low_threshold_adjustment_update (GtkAdjustment *,
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gpointer);
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static void threshold_high_threshold_adjustment_update (GtkAdjustment *,
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gpointer);
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static void threshold (PixelRegion *, PixelRegion *, void *);
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static void threshold_histogram_range (HistogramWidget *, gint, gint,
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gpointer);
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/* threshold machinery */
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void
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threshold_2 (void *data,
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PixelRegion *srcPR,
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PixelRegion *destPR)
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{
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/* this function just re-orders the arguments so we can use
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* pixel_regions_process_paralell
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*/
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threshold (srcPR, destPR, data);
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}
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static void
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threshold (PixelRegion *srcPR,
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PixelRegion *destPR,
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void *data)
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{
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ThresholdDialog *td;
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unsigned char *src, *s;
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unsigned char *dest, *d;
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int has_alpha, alpha;
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int w, h, b;
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int value;
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td = (ThresholdDialog *) data;
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h = srcPR->h;
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src = srcPR->data;
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dest = destPR->data;
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has_alpha = (srcPR->bytes == 2 || srcPR->bytes == 4);
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alpha = has_alpha ? srcPR->bytes - 1 : srcPR->bytes;
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while (h--)
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{
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w = srcPR->w;
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s = src;
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d = dest;
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while (w--)
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{
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if (td->color)
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{
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value = MAX (s[RED_PIX], s[GREEN_PIX]);
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value = MAX (value, s[BLUE_PIX]);
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value = (value >= td->low_threshold && value <= td->high_threshold ) ? 255 : 0;
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}
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else
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value = (s[GRAY_PIX] >= td->low_threshold && s[GRAY_PIX] <= td->high_threshold) ? 255 : 0;
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for (b = 0; b < alpha; b++)
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d[b] = value;
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if (has_alpha)
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d[alpha] = s[alpha];
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s += srcPR->bytes;
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d += destPR->bytes;
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}
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src += srcPR->rowstride;
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dest += destPR->rowstride;
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}
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}
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/* threshold action functions */
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static void
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threshold_control (Tool *tool,
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ToolAction action,
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gpointer gdisp_ptr)
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{
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switch (action)
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{
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case PAUSE:
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break;
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case RESUME:
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break;
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case HALT:
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if (threshold_dialog)
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threshold_cancel_callback (NULL, (gpointer) threshold_dialog);
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break;
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default:
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break;
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}
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}
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Tool *
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tools_new_threshold (void)
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{
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Tool * tool;
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Threshold * private;
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/* The tool options */
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if (! threshold_options)
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{
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threshold_options = tool_options_new (_("Threshold Options"));
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tools_register (THRESHOLD, threshold_options);
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}
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tool = tools_new_tool (THRESHOLD);
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private = g_new (Threshold, 1);
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tool->scroll_lock = TRUE; /* Disallow scrolling */
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tool->preserve = FALSE; /* Don't preserve on drawable change */
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tool->private = (void *) private;
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tool->control_func = threshold_control;
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return tool;
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}
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void
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tools_free_threshold (Tool *tool)
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{
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Threshold * thresh;
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thresh = (Threshold *) tool->private;
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/* Close the threshold dialog */
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if (threshold_dialog)
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threshold_cancel_callback (NULL, (gpointer) threshold_dialog);
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g_free (thresh);
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}
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void
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threshold_initialize (GDisplay *gdisp)
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{
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if (drawable_indexed (gimage_active_drawable (gdisp->gimage)))
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{
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g_message (_("Threshold does not operate on indexed drawables."));
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return;
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}
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/* The threshold dialog */
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if (!threshold_dialog)
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threshold_dialog = threshold_dialog_new ();
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else
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if (!GTK_WIDGET_VISIBLE (threshold_dialog->shell))
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gtk_widget_show (threshold_dialog->shell);
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threshold_dialog->low_threshold = 127;
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threshold_dialog->high_threshold = 255;
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threshold_dialog->drawable = gimage_active_drawable (gdisp->gimage);
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threshold_dialog->color = drawable_color (threshold_dialog->drawable);
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threshold_dialog->image_map =
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image_map_create (gdisp, threshold_dialog->drawable);
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gimp_histogram_calculate_drawable (threshold_dialog->hist,
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threshold_dialog->drawable);
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gtk_signal_handler_block_by_data (GTK_OBJECT (threshold_dialog->histogram),
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threshold_dialog);
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histogram_widget_update (threshold_dialog->histogram,
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threshold_dialog->hist);
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gtk_signal_handler_unblock_by_data (GTK_OBJECT (threshold_dialog->histogram),
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threshold_dialog);
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threshold_update (threshold_dialog, ALL);
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if (threshold_dialog->preview)
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threshold_preview (threshold_dialog);
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}
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/**********************/
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/* Threshold dialog */
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/**********************/
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static ThresholdDialog *
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threshold_dialog_new (void)
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{
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ThresholdDialog *td;
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GtkWidget *vbox;
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GtkWidget *hbox;
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GtkWidget *spinbutton;
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GtkWidget *label;
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GtkWidget *frame;
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GtkWidget *toggle;
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GtkObject *data;
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td = g_new (ThresholdDialog, 1);
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td->preview = TRUE;
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td->low_threshold = 127;
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td->high_threshold = 255;
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td->hist = gimp_histogram_new ();
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/* The shell and main vbox */
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td->shell =
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gimp_dialog_new (_("Threshold"), "threshold",
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tools_help_func, NULL,
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GTK_WIN_POS_NONE,
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FALSE, TRUE, FALSE,
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_("OK"), threshold_ok_callback,
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td, NULL, TRUE, FALSE,
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_("Reset"), threshold_reset_callback,
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td, NULL, TRUE, FALSE,
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_("Cancel"), threshold_cancel_callback,
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td, NULL, FALSE, TRUE,
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NULL);
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vbox = gtk_vbox_new (FALSE, 4);
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gtk_container_set_border_width (GTK_CONTAINER (vbox), 4);
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gtk_container_add (GTK_CONTAINER (GTK_DIALOG (td->shell)->vbox), vbox);
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/* Horizontal box for threshold text widget */
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hbox = gtk_hbox_new (FALSE, 4);
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gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
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label = gtk_label_new (_("Threshold Range:"));
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gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
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gtk_widget_show (label);
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/* low threshold spinbutton */
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data = gtk_adjustment_new (td->low_threshold, 0.0, 255.0, 1.0, 10.0, 0.0);
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td->low_threshold_data = GTK_ADJUSTMENT (data);
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spinbutton = gtk_spin_button_new (td->low_threshold_data, 1.0, 0);
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gtk_widget_set_usize (spinbutton, 75, -1);
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gtk_box_pack_start (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0);
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gtk_signal_connect (GTK_OBJECT (td->low_threshold_data), "value_changed",
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GTK_SIGNAL_FUNC (threshold_low_threshold_adjustment_update),
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td);
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gtk_widget_show (spinbutton);
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/* high threshold spinbutton */
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data = gtk_adjustment_new (td->high_threshold, 0.0, 255.0, 1.0, 10.0, 0.0);
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td->high_threshold_data = GTK_ADJUSTMENT (data);
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spinbutton = gtk_spin_button_new (td->high_threshold_data, 1.0, 0);
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gtk_widget_set_usize (spinbutton, 75, -1);
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gtk_box_pack_start (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0);
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gtk_signal_connect (GTK_OBJECT (td->high_threshold_data), "value_changed",
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GTK_SIGNAL_FUNC (threshold_high_threshold_adjustment_update),
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td);
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gtk_widget_show (spinbutton);
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gtk_widget_show (hbox);
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/* The threshold histogram */
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hbox = gtk_hbox_new (TRUE, 0);
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gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
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frame = gtk_frame_new (NULL);
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gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
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gtk_box_pack_start (GTK_BOX (hbox), frame, TRUE, FALSE, 0);
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td->histogram = histogram_widget_new (HISTOGRAM_WIDTH, HISTOGRAM_HEIGHT);
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gtk_container_add (GTK_CONTAINER (frame), GTK_WIDGET (td->histogram));
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gtk_signal_connect (GTK_OBJECT (td->histogram), "rangechanged",
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GTK_SIGNAL_FUNC (threshold_histogram_range),
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td);
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gtk_widget_show (GTK_WIDGET(td->histogram));
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gtk_widget_show (frame);
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gtk_widget_show (hbox);
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/* Horizontal box for preview */
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hbox = gtk_hbox_new (FALSE, 4);
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gtk_box_pack_end (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
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/* The preview toggle */
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toggle = gtk_check_button_new_with_label (_("Preview"));
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gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), td->preview);
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gtk_box_pack_end (GTK_BOX (hbox), toggle, FALSE, FALSE, 0);
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gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
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GTK_SIGNAL_FUNC (threshold_preview_update),
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td);
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gtk_widget_show (toggle);
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gtk_widget_show (hbox);
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gtk_widget_show (vbox);
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gtk_widget_show (td->shell);
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return td;
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}
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static void
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threshold_update (ThresholdDialog *td,
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gint update)
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{
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if (update & LOW)
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{
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gtk_adjustment_set_value (td->low_threshold_data, td->low_threshold);
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}
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if (update & HIGH)
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{
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gtk_adjustment_set_value (td->high_threshold_data, td->high_threshold);
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}
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if (update & HISTOGRAM)
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{
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histogram_widget_range (td->histogram,
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td->low_threshold,
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td->high_threshold);
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}
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}
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static void
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threshold_preview (ThresholdDialog *td)
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{
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if (!td->image_map)
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{
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g_warning ("threshold_preview(): No image map");
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return;
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}
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active_tool->preserve = TRUE;
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image_map_apply (td->image_map, threshold, td);
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active_tool->preserve = FALSE;
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}
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static void
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threshold_reset_callback (GtkWidget *widget,
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gpointer data)
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{
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ThresholdDialog *td;
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td = (ThresholdDialog *) data;
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td->low_threshold = 127.0;
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td->high_threshold = 255.0;
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threshold_update (td, ALL);
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if (td->preview)
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threshold_preview (td);
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}
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static void
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threshold_ok_callback (GtkWidget *widget,
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gpointer data)
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{
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ThresholdDialog *td;
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td = (ThresholdDialog *) data;
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if (GTK_WIDGET_VISIBLE (td->shell))
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gtk_widget_hide (td->shell);
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active_tool->preserve = TRUE;
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if (!td->preview)
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image_map_apply (td->image_map, threshold, (void *) td);
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if (td->image_map)
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image_map_commit (td->image_map);
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active_tool->preserve = FALSE;
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td->image_map = NULL;
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active_tool->gdisp_ptr = NULL;
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active_tool->drawable = NULL;
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}
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static void
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threshold_cancel_callback (GtkWidget *widget,
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gpointer data)
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{
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ThresholdDialog *td;
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td = (ThresholdDialog *) data;
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if (GTK_WIDGET_VISIBLE (td->shell))
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gtk_widget_hide (td->shell);
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if (td->image_map)
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{
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active_tool->preserve = TRUE;
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image_map_abort (td->image_map);
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active_tool->preserve = FALSE;
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td->image_map = NULL;
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gdisplays_flush ();
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}
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active_tool->gdisp_ptr = NULL;
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active_tool->drawable = NULL;
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}
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static void
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threshold_preview_update (GtkWidget *widget,
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gpointer data)
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{
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ThresholdDialog *td;
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td = (ThresholdDialog *) data;
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if (GTK_TOGGLE_BUTTON (widget)->active)
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{
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td->preview = TRUE;
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threshold_preview (td);
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}
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else
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td->preview = FALSE;
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}
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static void
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threshold_low_threshold_adjustment_update (GtkAdjustment *adjustment,
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gpointer data)
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{
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ThresholdDialog *td;
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td = (ThresholdDialog *) data;
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if (td->low_threshold != adjustment->value)
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{
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td->low_threshold = adjustment->value;
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threshold_update (td, HISTOGRAM);
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if (td->preview)
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threshold_preview (td);
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}
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}
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static void
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threshold_high_threshold_adjustment_update (GtkAdjustment *adjustment,
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gpointer data)
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{
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ThresholdDialog *td;
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td = (ThresholdDialog *) data;
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if (td->high_threshold != adjustment->value)
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{
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td->high_threshold = adjustment->value;
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threshold_update (td, HISTOGRAM);
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if (td->preview)
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threshold_preview (td);
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}
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}
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static void
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threshold_histogram_range (HistogramWidget *widget,
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gint start,
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gint end,
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gpointer data)
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{
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ThresholdDialog *td;
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td = (ThresholdDialog *) data;
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td->low_threshold = start;
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td->high_threshold = end;
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threshold_update (td, LOW | HIGH);
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if (td->preview)
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threshold_preview (td);
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}
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