Imported Upstream version 0.84upstream/0.84

1 files changed, 0 insertions, 1541 deletions

diff --git a/frontend/xsane-gamma.c b/frontend/xsane-gamma.c
deleted file mode 100644
index 90573f5..0000000
--- a/frontend/xsane-gamma.c
+++ /dev/null
@@ -1,1541 +0,0 @@
-/* xsane -- a graphical (X11, gtk) scanner-oriented SANE frontend
-
-   xsane-gamma.c
-
-   Oliver Rauch <Oliver.Rauch@Wolfsburg.DE>
-   Copyright (C) 1998-2000 Oliver Rauch
-   This file is part of the XSANE package.
-
-   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., 675 Mass Ave, Cambridge, MA 02139, USA.  */ 
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-#include "xsane.h"
-#include "xsane-front-gtk.h"
-#include "xsane-back-gtk.h"
-#include "xsane-preferences.h"
-#include "xsane-preview.h"
-#include "xsane-save.h"
-
-#ifdef HAVE_LIBPNG
-#ifdef HAVE_LIBZ
-#include <png.h>
-#include <zlib.h>
-#endif
-#endif
-
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-/* forward declarations: */
-
-static void xsane_bound_double(double *value, double min, double max);
-void xsane_clear_histogram(XsanePixmap *hist);
-static void xsane_draw_histogram_with_points(XsanePixmap *hist, int invert,
-                                             SANE_Int *count, SANE_Int *count_red, SANE_Int *count_green, SANE_Int *count_blue,
-                                             int show_red, int show_green, int show_blue, int show_inten, double scale);
-static void xsane_draw_histogram_with_lines(XsanePixmap *hist, int invert,
-                                            SANE_Int *count, SANE_Int *count_red, SANE_Int *count_green, SANE_Int *count_blue,
-                                            int show_red, int show_green, int show_blue, int show_inten, double scale);
-void xsane_draw_slider_level(XsaneSlider *slider);
-static void xsane_set_slider(XsaneSlider *slider, double min, double mid, double max);
-void xsane_update_slider(XsaneSlider *slider);
-void xsane_update_sliders(void);
-static gint xsane_slider_callback(GtkWidget *widget, GdkEvent *event, XsaneSlider *slider);
-void xsane_create_slider(XsaneSlider *slider);
-void xsane_create_histogram(GtkWidget *parent, const char *title, int width, int height, XsanePixmap *hist);
-static void xsane_calculate_auto_enhancement(int negative,
-              SANE_Int *count_raw, SANE_Int *count_raw_red, SANE_Int *count_raw_green, SANE_Int *count_raw_blue);
-void xsane_calculate_histogram(void);
-void xsane_update_histogram(void);
-void xsane_histogram_toggle_button_callback(GtkWidget *widget, gpointer data);
-void xsane_create_gamma_curve(SANE_Int *gammadata, int negative, double gamma,
-                              double brightness, double contrast, int numbers, int maxout);
-void xsane_update_gamma(void);
-static void xsane_enhancement_update(void);
-static void xsane_gamma_to_histogram(double *min, double *mid, double *max,
-                                     double contrast, double brightness, double gamma);
-void xsane_enhancement_by_gamma(void);
-void xsane_enhancement_restore_default(void);
-void xsane_enhancement_restore(void);
-void xsane_enhancement_store(void);
-static void xsane_histogram_to_gamma(XsaneSlider *slider, double *contrast, double *brightness, double *gamma);
-void xsane_enhancement_by_histogram(void);
-static gint xsane_histogram_win_delete(GtkWidget *widget, gpointer data);
-void xsane_create_histogram_dialog(const char *devicetext);
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-static void xsane_bound_double(double *value, double min, double max)
-{
-  if (*value < min)
-  {
-    *value = min;
-  }
-
-  if (*value > max)
-  {
-    *value = max;
-  }
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-void xsane_clear_histogram(XsanePixmap *hist)
-{
- GdkRectangle rect;
-
-  if(hist->pixmap)
-  {
-    rect.x=0;
-    rect.y=0;
-    rect.width  = HIST_WIDTH;
-    rect.height = HIST_HEIGHT;
-
-    gdk_draw_rectangle(hist->pixmap, xsane.gc_backg, TRUE, 0, 0, HIST_WIDTH, HIST_HEIGHT);
-    gtk_widget_draw(hist->pixmapwid, &rect);
-  }
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-static void xsane_draw_histogram_with_points(XsanePixmap *hist, int invert,
-                                             SANE_Int *count, SANE_Int *count_red, SANE_Int *count_green, SANE_Int *count_blue,
-                                             int show_red, int show_green, int show_blue, int show_inten, double scale)
-{
- GdkRectangle rect;
- int i;
- int inten, red, green, blue;
- int colval;
-
-#define XD 1
-#define YD 2
-
-  if(hist->pixmap)
-  {
-    rect.x=0;
-    rect.y=0;
-    rect.width  = HIST_WIDTH;
-    rect.height = HIST_HEIGHT;
-
-    gdk_draw_rectangle(hist->pixmap, xsane.gc_backg, TRUE, 0, 0, HIST_WIDTH, HIST_HEIGHT);
-
-    red   = 0;
-    green = 0;
-    blue  = 0;
-
-    for (i=0; i < HIST_WIDTH; i++)
-    {
-      if (invert)
-      {
-        colval = 255-i;
-      }
-      else
-      {
-        colval = i;
-      }
-
-      inten = show_inten * count[colval]       * scale;
-
-      if (xsane.xsane_color)
-      {
-        red   = show_red   * count_red[colval]   * scale;
-        green = show_green * count_green[colval] * scale;
-        blue  = show_blue  * count_blue[colval]  * scale;
-      }
-
-      if (inten > HIST_HEIGHT)
-      inten = HIST_HEIGHT;
-
-      if (red > HIST_HEIGHT)
-      red = HIST_HEIGHT;
-
-      if (green > HIST_HEIGHT)
-      green = HIST_HEIGHT;
-
-      if (blue > HIST_HEIGHT)
-      blue = HIST_HEIGHT;
-
-
-      gdk_draw_rectangle(hist->pixmap, xsane.gc_red,   TRUE, i, HIST_HEIGHT - red,   XD, YD);
-      gdk_draw_rectangle(hist->pixmap, xsane.gc_green, TRUE, i, HIST_HEIGHT - green, XD, YD);
-      gdk_draw_rectangle(hist->pixmap, xsane.gc_blue,  TRUE, i, HIST_HEIGHT - blue,  XD, YD);
-      gdk_draw_rectangle(hist->pixmap, xsane.gc_black, TRUE, i, HIST_HEIGHT - inten, XD, YD);
-    }
-
-    gtk_widget_draw(hist->pixmapwid, &rect);
-  }
-}
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-static void xsane_draw_histogram_with_lines(XsanePixmap *hist, int invert,
-                                            SANE_Int *count, SANE_Int *count_red, SANE_Int *count_green, SANE_Int *count_blue,
-                                            int show_red, int show_green, int show_blue, int show_inten, double scale)
-{
- GdkRectangle rect;
- int i, j, k;
- int inten, red, green, blue;
- int inten0=0, red0=0, green0=0, blue0=0;
- int val[4];
- int val2[4];
- int color[4];
- int val_swap;
- int color_swap;
- int colval;
-
-  if (hist->pixmap)
-  {
-    rect.x=0;
-    rect.y=0;
-    rect.width  = HIST_WIDTH;
-    rect.height = HIST_HEIGHT;
-
-    gdk_draw_rectangle(hist->pixmap, xsane.gc_backg, TRUE, 0, 0, HIST_WIDTH, HIST_HEIGHT);
-
-    red   = 0;
-    green = 0;
-    blue  = 0;
-
-    for (i=0; i < HIST_WIDTH; i++)
-    {
-      if (invert)
-      {
-        colval = 255-i;
-      }
-      else
-      {
-        colval = i;
-      }
-
-      inten = show_inten * count[colval]       * scale;
-
-      if (xsane.xsane_color)
-      {
-        red   = show_red   * count_red[colval]   * scale;
-        green = show_green * count_green[colval] * scale;
-        blue  = show_blue  * count_blue[colval]  * scale;
-      }
-
-      if (inten > HIST_HEIGHT)
-      inten = HIST_HEIGHT;
-
-      if (red > HIST_HEIGHT)
-      red = HIST_HEIGHT;
-
-      if (green > HIST_HEIGHT)
-      green = HIST_HEIGHT;
-
-      if (blue > HIST_HEIGHT)
-      blue = HIST_HEIGHT;
-
-      val[0] = red;   color[0] = 0;
-      val[1] = green; color[1] = 1;
-      val[2] = blue;  color[2] = 2;
-      val[3] = inten; color[3] = 3;
-
-      for (j=0; j<3; j++)
-      {
-        for (k=j+1; k<4; k++)
-        {
-          if (val[j] < val[k])
-          {
-            val_swap   = val[j];
-            color_swap = color[j];
-            val[j]     = val[k];
-            color[j]   = color[k];
-            val[k]     = val_swap;
-            color[k]   = color_swap;
-	  }
-	}
-      }
-      val2[0]=val[1]+1;
-      val2[1]=val[2]+1;
-      val2[2]=val[3]+1;
-      val2[3]=0;
-
-      for (j=0; j<4; j++)
-      {
-        switch(color[j])
-	{
-	  case 0: red0   = val2[j];
-	  break;
-	  case 1: green0 = val2[j];
-	  break;
-	  case 2: blue0  = val2[j];
-	  break;
-	  case 3: inten0 = val2[j];
-	  break;
-	}
-      }
-
-
-      gdk_draw_line(hist->pixmap, xsane.gc_red,   i, HIST_HEIGHT - red,   i, HIST_HEIGHT - red0);
-      gdk_draw_line(hist->pixmap, xsane.gc_green, i, HIST_HEIGHT - green, i, HIST_HEIGHT - green0);
-      gdk_draw_line(hist->pixmap, xsane.gc_blue,  i, HIST_HEIGHT - blue,  i, HIST_HEIGHT - blue0);
-      gdk_draw_line(hist->pixmap, xsane.gc_black, i, HIST_HEIGHT - inten, i, HIST_HEIGHT - inten0);
-    }
-
-    gtk_widget_draw(hist->pixmapwid, &rect);
-  }
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-void xsane_establish_slider(XsaneSlider *slider)
-{
- int x, y, pos, len;
- guchar buf[XSANE_SLIDER_WIDTH*3];
- GdkRectangle rect;
-
-  buf[0] = buf[1] = buf[2] = 0;
-  buf[3+0] = buf[3+1] = buf[3+2]= 0;
-
-  for (x=0; x<256; x++)
-  {
-    buf[3*x+0+6] = x * slider->r;
-    buf[3*x+1+6] = x * slider->g;
-    buf[3*x+2+6] = x * slider->b;
-  }
-
-  buf[258*3+0] = 255 * slider->r;
-  buf[258*3+1] = 255 * slider->g;
-  buf[258*3+2] = 255 * slider->b;
-
-  buf[259*3+0] = 255 * slider->r;
-  buf[259*3+1] = 255 * slider->g;
-  buf[259*3+2] = 255 * slider->b;
-
-  for (y=0; y<XSANE_SLIDER_HEIGHT; y++)
-  {
-    pos = slider->position[0]-y/2;
-    len = y;
-    if (pos<-2)
-    {
-      len = len + pos + 2;
-      pos = -2;
-    }
-    pos = pos * 3 + 6;
-
-    for (x=0; x<=len; x++)
-    {
-      if ((x == 0) || (x == len) || (y == XSANE_SLIDER_HEIGHT-1))
-      {
-        buf[pos++] = 255;
-        buf[pos++] = 255;
-        buf[pos++] = 255;
-      }
-      else
-      {
-        buf[pos++] = 0;
-        buf[pos++] = 0;
-        buf[pos++] = 0;
-      }
-    }
-
-
-    pos = slider->position[1]-y/2;
-    len = y;
-    pos = pos * 3 + 6;
-
-    for (x=0; x<=len; x++)
-    {
-      if ((x == 0) || (x == len) || (y == XSANE_SLIDER_HEIGHT-1))
-      {
-        buf[pos++] = 255;
-        buf[pos++] = 255;
-        buf[pos++] = 255;
-      }
-      else
-      {
-        buf[pos++] = 128;
-        buf[pos++] = 128;
-        buf[pos++] = 128;
-      }
-    }
-
-
-    pos = slider->position[2]-y/2;
-    len = y;
-    if (pos+len>257)
-    {
-      len = 257 - pos;
-    }
-    pos = pos * 3 + 6;
-
-    for (x=0; x<=len; x++)
-    {
-      if ((x == 0) || (x == len) || (y == XSANE_SLIDER_HEIGHT-1))
-      {
-        buf[pos++] = 0;
-        buf[pos++] = 0;
-        buf[pos++] = 0;
-      }
-      else
-      {
-        buf[pos++] = 255;
-        buf[pos++] = 255;
-        buf[pos++] = 255;
-      }
-    }
-
-    gtk_preview_draw_row(GTK_PREVIEW(slider->preview),buf, 0, y, XSANE_SLIDER_WIDTH);
-  }
-
-  rect.x=0;
-  rect.y=0;
-  rect.width  = XSANE_SLIDER_WIDTH;
-  rect.height = XSANE_SLIDER_HEIGHT;
-
-  gtk_widget_draw(slider->preview, &rect);
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-void xsane_draw_slider_level(XsaneSlider *slider)
-{
- int i;
- guchar buf[XSANE_SLIDER_WIDTH*3];
- GdkRectangle rect;
-
-  buf[0] = buf[1] = buf[2] = 0;
-  buf[3+0] = buf[3+1] = buf[3+2]= 0;
-
-  for (i=0; i<256; i++)
-  {
-    buf[3*i+0+6] = i * slider->r;
-    buf[3*i+1+6] = i * slider->g;
-    buf[3*i+2+6] = i * slider->b;
-  }
-
-  buf[258*3+0] = 255 * slider->r;
-  buf[258*3+1] = 255 * slider->g;
-  buf[258*3+2] = 255 * slider->b;
-
-  buf[259*3+0] = 255 * slider->r;
-  buf[259*3+1] = 255 * slider->g;
-  buf[259*3+2] = 255 * slider->b;
-
-  for (i=0; i<XSANE_SLIDER_HEIGHT; i++)
-  {
-    gtk_preview_draw_row(GTK_PREVIEW(slider->preview),buf, 0, i, XSANE_SLIDER_WIDTH);
-  }
-
-  rect.x=0;
-  rect.y=0;
-  rect.width  = XSANE_SLIDER_WIDTH;
-  rect.height = XSANE_SLIDER_HEIGHT;
-
-  gtk_widget_draw(slider->preview, &rect);
-}
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-static void xsane_set_slider(XsaneSlider *slider, double min, double mid, double max)
-{
-  slider->value[0] = min;
-  slider->value[1] = mid;
-  slider->value[2] = max;
-
-  slider->position[0] = min * 2.55;
-  slider->position[1] = mid * 2.55;
-  slider->position[2] = max * 2.55;
-
-  xsane_establish_slider(slider);
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-void xsane_update_slider(XsaneSlider *slider)
-{
-  slider->position[0] = 2.55 * slider->value[0];
-  slider->position[1] = 2.55 * slider->value[1];
-  slider->position[2] = 2.55 * slider->value[2];
-
-  xsane_establish_slider(slider);
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-void xsane_update_sliders()
-{
-  xsane_update_slider(&xsane.slider_gray);
-
-  if ( (xsane.xsane_color) && (!xsane.enhancement_rgb_default) )
-  {
-    xsane_update_slider(&xsane.slider_red);
-    xsane_update_slider(&xsane.slider_green);
-    xsane_update_slider(&xsane.slider_blue);
-
-    xsane.slider_gray.active  &= ~XSANE_SLIDER_INACTIVE; /* mark slider active */
-    xsane.slider_red.active   &= ~XSANE_SLIDER_INACTIVE; /* mark slider active */
-    xsane.slider_green.active &= ~XSANE_SLIDER_INACTIVE; /* mark slider active */
-    xsane.slider_blue.active  &= ~XSANE_SLIDER_INACTIVE; /* mark slider active */
-  }
-  else
-  {
-    xsane_draw_slider_level(&xsane.slider_red);   /* remove slider */
-    xsane_draw_slider_level(&xsane.slider_green); /* remove slider */
-    xsane_draw_slider_level(&xsane.slider_blue);  /* remove slider */
-
-    xsane.slider_red.active   = XSANE_SLIDER_INACTIVE; /* mark slider inactive */
-    xsane.slider_green.active = XSANE_SLIDER_INACTIVE; /* mark slider inactive */
-    xsane.slider_blue.active  = XSANE_SLIDER_INACTIVE; /* mark slider inactive */
-
-    if (xsane.param.depth == 1)
-    {
-      xsane_draw_slider_level(&xsane.slider_gray); /* remove slider */
-      xsane.slider_gray.active = XSANE_SLIDER_INACTIVE; /* mark slider inactive */
-    }
-    else
-    {
-      xsane.slider_gray.active &= ~XSANE_SLIDER_INACTIVE; /* mark slider active */
-    }
-  }
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-static gint xsane_slider_callback(GtkWidget *widget, GdkEvent *event, XsaneSlider *slider)
-{
- GdkEventButton *button_event;
- GdkEventMotion *motion_event;
- int distance;
- int i = 0;
- static int update = FALSE;
- static int event_count = 0;
- static int x;
-
-  if (slider->active == XSANE_SLIDER_INACTIVE)
-  {
-    return 0;
-  }
-
-  event_count++;
-
-  switch(event->type)
-  {
-    case GDK_BUTTON_PRESS:
-      gtk_grab_add(widget);
-      button_event = (GdkEventButton *) event;
-
-      distance = G_MAXINT;
-      for (i=0; i<3; i++)
-      {
-        if (fabs(button_event->x - slider->position[i]) < distance)
-	{
-	  slider->active = i + 1;
-	  distance = fabs(button_event->x - slider->position[i]);
-	}
-      }
-      if (distance<10)
-      {
-        x = button_event->x;
-        update = TRUE;
-      }
-      else
-      {
-        slider->active = XSANE_SLIDER_ACTIVE;
-      }
-     break;
-    
-    case GDK_BUTTON_RELEASE:
-      gtk_grab_remove(widget);
-      xsane_enhancement_by_histogram(); /* slider->active must be unchanged !!! */
-      slider->active = XSANE_SLIDER_ACTIVE; /* ok, now we can reset it */
-     break;
-
-    case GDK_MOTION_NOTIFY:
-      motion_event = (GdkEventMotion *) event;
-      gdk_window_get_pointer(widget->window, &x, 0, 0);
-      update = TRUE;
-     break;
-
-    default:
-     break;
-  }
-
-  if (update)
-  {
-    update = FALSE;
-    switch(slider->active)
-    {
-      case 1:
-	slider->value[0] = (x-XSANE_SLIDER_OFFSET) / 2.55;
-	xsane_bound_double(&slider->value[0], 0.0, slider->value[1] - 1);
-       break;
-
-      case 2:
-	slider->value[1] = (x-XSANE_SLIDER_OFFSET) / 2.55;
-	xsane_bound_double(&slider->value[1], slider->value[0] + 1, slider->value[2] - 1);
-       break;
-
-      case 3:
-	slider->value[2] = (x-XSANE_SLIDER_OFFSET) / 2.55;
-	xsane_bound_double(&slider->value[2], slider->value[1] + 1, 100.0);
-       break;
-
-      default:
-       break;
-    }
-    xsane_set_slider(slider, slider->value[0], slider->value[1], slider->value[2]);
-
-    if ((preferences.gtk_update_policy == GTK_UPDATE_CONTINUOUS) && (event_count == 1))
-    {
-      xsane_enhancement_by_histogram();
-    }
-    else if ((preferences.gtk_update_policy == GTK_UPDATE_DELAYED) && (event_count == 1))
-    {
-      xsane_enhancement_by_histogram();
-    }
-  }
-
-  while (gtk_events_pending())
-  {
-    gtk_main_iteration();
-  }
-
-  event_count--;
-
- return 0;
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-void xsane_create_slider(XsaneSlider *slider)
-{
-  slider->preview = gtk_preview_new(GTK_PREVIEW_COLOR);
-  gtk_preview_size(GTK_PREVIEW(slider->preview), XSANE_SLIDER_WIDTH, XSANE_SLIDER_HEIGHT);
-  gtk_widget_set_events(slider->preview, XSANE_SLIDER_EVENTS);
-  gtk_signal_connect(GTK_OBJECT(slider->preview), "event", GTK_SIGNAL_FUNC(xsane_slider_callback), slider);
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-void xsane_create_histogram(GtkWidget *parent, const char *title, int width, int height, XsanePixmap *hist)
-{
-  GdkBitmap *mask=NULL;
-
-   hist->frame     = gtk_frame_new(title);
-   hist->pixmap    = gdk_pixmap_new(xsane.histogram_dialog->window, width, height, -1);
-   hist->pixmapwid = gtk_pixmap_new(hist->pixmap, mask);
-   gtk_container_add(GTK_CONTAINER(hist->frame), hist->pixmapwid);
-   gdk_draw_rectangle(hist->pixmap, xsane.gc_backg, TRUE, 0, 0, width, height);
-
-   gtk_box_pack_start(GTK_BOX(parent), hist->frame, FALSE, FALSE, 2);
-   gtk_widget_show(hist->pixmapwid);
-   gtk_widget_show(hist->frame);
- }                           
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-static void xsane_calculate_auto_enhancement(int negative,
-              SANE_Int *count_raw, SANE_Int *count_raw_red, SANE_Int *count_raw_green, SANE_Int *count_raw_blue)
-{	 /* calculate white, medium and black values for auto enhancement */
- int limit, limit_mid;
- int points, points_mix, points_red, points_green, points_blue;
- int min, mid, max;
- int min_red, mid_red, max_red;
- int min_green, mid_green, max_green;
- int min_blue, mid_blue, max_blue;
- int val;
- int i;
-
-  if (xsane.preview)
-  {
-    points       = 0;
-    points_mix   = 0;
-    points_red   = 0;
-    points_green = 0;
-    points_blue  = 0;
-
-    for (i=0; i<256; i++)
-    {
-      points       += count_raw[i];
-      points_mix   += 10 * log(1 + count_raw[i] + count_raw_red[i] + count_raw_green[i] + count_raw_blue[i]);
-      points_red   += 10 * log(1 + count_raw_red[i]);
-      points_green += 10 * log(1 + count_raw_green[i]);
-      points_blue  += 10 * log(1 + count_raw_blue[i]);
-    }
-
-    limit = 1 + points / 5000;
-
-    /* ----- gray ----- */
-
-    min = -1;
-    val = 0;
-    while ( (val/4 < limit) && (min < 254) )
-    {
-      min++;
-      val += count_raw[min] + count_raw_red[min] + count_raw_green[min] + count_raw_blue[min];
-    }
-
-    max = HIST_WIDTH;
-    val = 0;
-    while ( (val/4 < limit) && (max > min + 1) )
-    {
-      max--;
-      val += count_raw[max] + count_raw_red[max] + count_raw_green[max] + count_raw_blue[max];
-    }
-
-    limit_mid = points_mix / 2.0;
-
-    mid = 0;
-    val = 0;
-    while ( (val < limit_mid) && (mid < max - 2) )
-    {
-      mid++;
-      val += 10 * log(1 + count_raw[mid] + count_raw_red[mid] + count_raw_green[mid] + count_raw_blue[mid]);
-    }
-
-    /* ----- red ----- */
-
-    min_red = -1;
-    val     = 0;
-    while ( (val < limit) && (min_red < 254) )
-    {
-      min_red++;
-      val += count_raw_red[min_red];
-    }
-
-    max_red = HIST_WIDTH;
-    val     = 0;
-    while ( (val < limit) && (max_red > min_red + 1) )
-    {
-      max_red--;
-      val += count_raw_red[max_red];
-    }
-
-    limit_mid = points_red / 2.0;
-
-    mid_red = 0;
-    val     = 0;
-    while ( (val < limit_mid) && (mid_red < max_red - 2) )
-    {
-      mid_red++;
-      val += 10 * log(1 + count_raw_red[mid_red]);
-    }
-
-    /* ----- green ----- */
-
-    min_green = -1;
-    val       = 0;
-    while ( (val < limit) && (min_green < 254) )
-    {
-      min_green++;
-      val += count_raw_green[min_green];
-    }
-
-    max_green = HIST_WIDTH;
-    val       = 0;
-    while ( (val < limit) && (max_green > min_green + 1) )
-    {
-      max_green--;
-      val += count_raw_green[max_green];
-    }
-
-    limit_mid = points_green / 2.0;
-
-    mid_green = 0;
-    val     = 0;
-    while ( (val < limit_mid) && (mid_green < max_green - 2) )
-    {
-      mid_green++;
-      val += 10 * log(1 + count_raw_green[mid_green]);
-    }
-
-    /* ----- blue ----- */
-
-    min_blue = -1;
-    val      = 0;
-    while ( (val < limit) && (min_blue < 254) )
-    {
-      min_blue++;
-      val += count_raw_blue[min_blue];
-    }
-
-    max_blue = HIST_WIDTH;
-    val       = 0;
-    while ( (val < limit) && (max_blue > min_blue + 1) )
-    {
-      max_blue--;
-      val += count_raw_blue[max_blue];
-    }
-
-    limit_mid = points_blue / 2.0;
-
-    mid_blue = 0;
-    val      = 0;
-    while ( (val < limit_mid) && (mid_blue < max_blue - 2) )
-    {
-      mid_blue++;
-      val += 10 * log(1 + count_raw_blue[mid_blue]);
-    }
-
-    if (negative)
-    {
-      xsane.auto_white = (255-min)/2.55;
-      xsane.auto_gray  = (255-mid)/2.55;
-      xsane.auto_black = (255-max)/2.55;
-
-      xsane.auto_white_red = (255-min_red)/2.55;
-      xsane.auto_gray_red  = (255-mid_red)/2.55;
-      xsane.auto_black_red = (255-max_red)/2.55;
-
-      xsane.auto_white_green = (255-min_green)/2.55;
-      xsane.auto_gray_green  = (255-mid_green)/2.55;
-      xsane.auto_black_green = (255-max_green)/2.55;
-
-      xsane.auto_white_blue = (255-min_blue)/2.55;
-      xsane.auto_gray_blue  = (255-mid_blue)/2.55;
-      xsane.auto_black_blue = (255-max_blue)/2.55;
-    }
-    else /* positive */
-    {
-      xsane.auto_white = max/2.55;
-      xsane.auto_gray  = mid/2.55;
-      xsane.auto_black = min/2.55;
-
-      xsane.auto_white_red = max_red/2.55;
-      xsane.auto_gray_red  = mid_red/2.55;
-      xsane.auto_black_red = min_red/2.55;
-
-      xsane.auto_white_green = max_green/2.55;
-      xsane.auto_gray_green  = mid_green/2.55;
-      xsane.auto_black_green = min_green/2.55;
-
-      xsane.auto_white_blue = max_blue/2.55;
-      xsane.auto_gray_blue  = mid_blue/2.55;
-      xsane.auto_black_blue = min_blue/2.55;
-    }
-  }
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-void xsane_calculate_histogram(void)
-{
- SANE_Int *count_raw;
- SANE_Int *count_raw_red;
- SANE_Int *count_raw_green;
- SANE_Int *count_raw_blue;
- SANE_Int *count_enh;
- SANE_Int *count_enh_red;
- SANE_Int *count_enh_green;
- SANE_Int *count_enh_blue;
- int i;
- int maxval_raw;
- int maxval_enh;
- int maxval;
- double scale;
-
-  /* at first reset auto enhancement values */
-
-  xsane.auto_black = 0.0;
-  xsane.auto_gray  = 50.0;
-  xsane.auto_white = 100.0;
-
-  xsane.auto_black_red = 0.0;
-  xsane.auto_gray_red  = 50.0;
-  xsane.auto_white_red = 100.0;
-
-  xsane.auto_black_green = 0.0;
-  xsane.auto_gray_green  = 50.0;
-  xsane.auto_white_green = 100.0;
-
-  xsane.auto_black_blue = 0.0;
-  xsane.auto_gray_blue  = 50.0;
-  xsane.auto_white_blue = 100.0;
-
-  if (xsane.preview) /* preview window exists? */
-  {
-    count_raw       = calloc(256, sizeof(SANE_Int));
-    count_raw_red   = calloc(256, sizeof(SANE_Int));
-    count_raw_green = calloc(256, sizeof(SANE_Int));
-    count_raw_blue  = calloc(256, sizeof(SANE_Int));
-    count_enh       = calloc(256, sizeof(SANE_Int));
-    count_enh_red   = calloc(256, sizeof(SANE_Int));
-    count_enh_green = calloc(256, sizeof(SANE_Int));
-    count_enh_blue  = calloc(256, sizeof(SANE_Int));
-
-    preview_calculate_histogram(xsane.preview, count_raw, count_raw_red, count_raw_green, count_raw_blue,
-                                count_enh, count_enh_red, count_enh_green, count_enh_blue);
-
-    if (xsane.param.depth > 1)
-    {
-      xsane_calculate_auto_enhancement(xsane.negative, count_raw, count_raw_red, count_raw_green, count_raw_blue);
-    }
-
-    if (xsane.histogram_log) /* logarithmical display */
-    {
-      for (i=0; i<=255; i++)
-      {
-        count_raw[i]       = (int) (50*log(1.0 + count_raw[i]));
-        count_raw_red[i]   = (int) (50*log(1.0 + count_raw_red[i]));
-        count_raw_green[i] = (int) (50*log(1.0 + count_raw_green[i]));
-        count_raw_blue[i]  = (int) (50*log(1.0 + count_raw_blue[i]));
-
-        count_enh[i]       = (int) (50*log(1.0 + count_enh[i]));
-        count_enh_red[i]   = (int) (50*log(1.0 + count_enh_red[i]));
-        count_enh_green[i] = (int) (50*log(1.0 + count_enh_green[i]));
-        count_enh_blue[i]  = (int) (50*log(1.0 + count_enh_blue[i]));
-      }
-    }
-
-    maxval_raw = 0;
-    maxval_enh = 0;
-
-    /* first and last 10 values are not used for calculating maximum value */
-    for (i = 10 ; i < HIST_WIDTH - 10; i++)
-    {
-      if (count_raw[i]       > maxval_raw) { maxval_raw = count_raw[i]; }
-      if (count_raw_red[i]   > maxval_raw) { maxval_raw = count_raw_red[i]; }
-      if (count_raw_green[i] > maxval_raw) { maxval_raw = count_raw_green[i]; }
-      if (count_raw_blue[i]  > maxval_raw) { maxval_raw = count_raw_blue[i]; }
-      if (count_enh[i]       > maxval_enh) { maxval_enh = count_enh[i]; }
-      if (count_enh_red[i]   > maxval_enh) { maxval_enh = count_enh_red[i]; }
-      if (count_enh_green[i] > maxval_enh) { maxval_enh = count_enh_green[i]; }
-      if (count_enh_blue[i]  > maxval_enh) { maxval_enh = count_enh_blue[i]; }
-    }
-    maxval = ((maxval_enh > maxval_raw) ? maxval_enh : maxval_raw);
-    scale = 100.0/maxval;
-
-    if (xsane.histogram_lines)
-    {
-      xsane_draw_histogram_with_lines(&xsane.histogram_raw, xsane.negative,
-                         count_raw, count_raw_red, count_raw_green, count_raw_blue,
-                        xsane.histogram_red, xsane.histogram_green, xsane.histogram_blue, xsane.histogram_int, scale);
-
-      xsane_draw_histogram_with_lines(&xsane.histogram_enh, 0 /* negative is done by gamma table */,
-                        count_enh, count_enh_red, count_enh_green, count_enh_blue,
-                        xsane.histogram_red, xsane.histogram_green, xsane.histogram_blue, xsane.histogram_int, scale);
-    }
-    else
-    {
-      xsane_draw_histogram_with_points(&xsane.histogram_raw, xsane.negative,
-                        count_raw, count_raw_red, count_raw_green, count_raw_blue,
-                        xsane.histogram_red, xsane.histogram_green, xsane.histogram_blue, xsane.histogram_int, scale);
-
-      xsane_draw_histogram_with_points(&xsane.histogram_enh, 0 /*negative is done by gamma table */,
-                        count_enh, count_enh_red, count_enh_green, count_enh_blue,
-                        xsane.histogram_red, xsane.histogram_green, xsane.histogram_blue, xsane.histogram_int, scale);
-    }
-
-    free(count_enh_blue);
-    free(count_enh_green);
-    free(count_enh_red);
-    free(count_enh);
-    free(count_raw_blue);
-    free(count_raw_green);
-    free(count_raw_red);
-    free(count_raw);
-  }
-  else
-  {
-    xsane_clear_histogram(&xsane.histogram_raw);
-    xsane_clear_histogram(&xsane.histogram_enh);
-  }
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-void xsane_update_histogram()
-{
-  if (preferences.show_histogram)
-  {
-    xsane_calculate_histogram();
-    gtk_widget_show(xsane.histogram_dialog);
-  }
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-void xsane_histogram_toggle_button_callback(GtkWidget *widget, gpointer data)
-{
-  int *valuep = data;
-
-  *valuep = (GTK_TOGGLE_BUTTON(widget)->active != 0);
-  xsane_update_histogram();
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-void xsane_create_gamma_curve(SANE_Int *gammadata, int negative, double gamma,
-                              double brightness, double contrast, int numbers, int maxout)
-{
- int i;
- double midin;
- double val;
- double m;
- double b;
- int maxin = numbers-1;
-
-  if (contrast < -100.0)
-  {
-    contrast = -100.0;
-  }
-
-  midin = (int)(numbers / 2.0);
-
-  m = 1.0 + contrast/100.0;
-  b = (1.0 + brightness/100.0) * midin;
-
-  if (negative)
-  {
-    for (i=0; i <= maxin; i++)
-    {
-      val = ((double) (maxin - i)) - midin;
-      val = val * m + b;
-      xsane_bound_double(&val, 0.0, maxin);
-
-      gammadata[i] = 0.5 + maxout * pow( val/maxin, (1.0/gamma) );
-    }
-  }
-  else /* positive */
-  {
-    for (i=0; i <= maxin; i++)
-    {
-      val = ((double) i) - midin;
-      val = val * m + b;
-      xsane_bound_double(&val, 0.0, maxin);
-
-      gammadata[i] = 0.5 + maxout * pow( val/maxin, (1.0/gamma) );
-    }
-  }
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-void xsane_update_gamma(void)
-{
-  if (xsane.preview)
-  {
-    if (!xsane.preview_gamma_data_red)
-    {
-      xsane.preview_gamma_data_red   = malloc(256 * sizeof(SANE_Int));
-      xsane.preview_gamma_data_green = malloc(256 * sizeof(SANE_Int));
-      xsane.preview_gamma_data_blue  = malloc(256 * sizeof(SANE_Int));
-
-      xsane.histogram_gamma_data_red   = malloc(256 * sizeof(SANE_Int));
-      xsane.histogram_gamma_data_green = malloc(256 * sizeof(SANE_Int));
-      xsane.histogram_gamma_data_blue  = malloc(256 * sizeof(SANE_Int));
-    }
-
-    xsane_create_gamma_curve(xsane.preview_gamma_data_red, xsane.negative,
-		 	     xsane.gamma * xsane.gamma_red * preferences.preview_gamma * preferences.preview_gamma_red,
-			     xsane.brightness + xsane.brightness_red,
-			     xsane.contrast + xsane.contrast_red, 256, 255);
-
-    xsane_create_gamma_curve(xsane.preview_gamma_data_green, xsane.negative,
-			     xsane.gamma * xsane.gamma_green * preferences.preview_gamma * preferences.preview_gamma_green,
-			     xsane.brightness + xsane.brightness_green,
-			     xsane.contrast + xsane.contrast_green, 256, 255);
-
-    xsane_create_gamma_curve(xsane.preview_gamma_data_blue, xsane.negative,
-			     xsane.gamma * xsane.gamma_blue * preferences.preview_gamma * preferences.preview_gamma_blue,
-			     xsane.brightness + xsane.brightness_blue,
-			     xsane.contrast + xsane.contrast_blue , 256, 255);
-
-    xsane_create_gamma_curve(xsane.histogram_gamma_data_red, xsane.negative,
-		 	     xsane.gamma * xsane.gamma_red,
-			     xsane.brightness + xsane.brightness_red,
-			     xsane.contrast + xsane.contrast_red, 256, 255);
-
-    xsane_create_gamma_curve(xsane.histogram_gamma_data_green, xsane.negative,
-			     xsane.gamma * xsane.gamma_green,
-			     xsane.brightness + xsane.brightness_green,
-			     xsane.contrast + xsane.contrast_green, 256, 255);
-
-    xsane_create_gamma_curve(xsane.histogram_gamma_data_blue, xsane.negative,
-			     xsane.gamma * xsane.gamma_blue,
-			     xsane.brightness + xsane.brightness_blue,
-			     xsane.contrast + xsane.contrast_blue , 256, 255);
-
-    preview_gamma_correction(xsane.preview,
-                             xsane.preview_gamma_data_red, xsane.preview_gamma_data_green, xsane.preview_gamma_data_blue,
-                             xsane.histogram_gamma_data_red, xsane.histogram_gamma_data_green, xsane.histogram_gamma_data_blue);
-
-  }
-  xsane_update_histogram();
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-static void xsane_enhancement_update(void)
-{
- guint sig_changed=0;
-
-  if (xsane.param.depth == 1) /* lineart? no gamma */
-  {
-    return;
-  } 
-
-  sig_changed = gtk_signal_lookup("changed", GTK_OBJECT_TYPE(xsane.gamma_widget));
-
-  GTK_ADJUSTMENT(xsane.gamma_widget)->value      = xsane.gamma;
-  GTK_ADJUSTMENT(xsane.brightness_widget)->value = xsane.brightness;
-  GTK_ADJUSTMENT(xsane.contrast_widget)->value   = xsane.contrast;
-
-  if ( (xsane.xsane_color) && (!xsane.enhancement_rgb_default) )
-  {
-    GTK_ADJUSTMENT(xsane.gamma_red_widget)->value    = xsane.gamma_red;
-    GTK_ADJUSTMENT(xsane.gamma_green_widget)->value  = xsane.gamma_green;
-    GTK_ADJUSTMENT(xsane.gamma_blue_widget)->value   = xsane.gamma_blue;
-
-    GTK_ADJUSTMENT(xsane.brightness_red_widget)->value   = xsane.brightness_red;
-    GTK_ADJUSTMENT(xsane.brightness_green_widget)->value = xsane.brightness_green;
-    GTK_ADJUSTMENT(xsane.brightness_blue_widget)->value  = xsane.brightness_blue;
-
-    GTK_ADJUSTMENT(xsane.contrast_red_widget)->value   = xsane.contrast_red;
-    GTK_ADJUSTMENT(xsane.contrast_green_widget)->value = xsane.contrast_green;
-    GTK_ADJUSTMENT(xsane.contrast_blue_widget)->value  = xsane.contrast_blue;
-
-    gtk_signal_emit(xsane.gamma_red_widget,        sig_changed); 
-    gtk_signal_emit(xsane.gamma_green_widget,      sig_changed); 
-    gtk_signal_emit(xsane.gamma_blue_widget,       sig_changed); 
-
-    gtk_signal_emit(xsane.brightness_red_widget,   sig_changed); 
-    gtk_signal_emit(xsane.brightness_green_widget, sig_changed); 
-    gtk_signal_emit(xsane.brightness_blue_widget,  sig_changed); 
-
-    gtk_signal_emit(xsane.contrast_red_widget,     sig_changed); 
-    gtk_signal_emit(xsane.contrast_green_widget,   sig_changed); 
-    gtk_signal_emit(xsane.contrast_blue_widget,    sig_changed); 
-    
-  }
-
-  gtk_signal_emit(xsane.gamma_widget,      sig_changed); 
-  gtk_signal_emit(xsane.brightness_widget, sig_changed); 
-  gtk_signal_emit(xsane.contrast_widget,   sig_changed); 
-
-  xsane_update_sliders(); /* update histogram slider */
-
-  while (gtk_events_pending())
-  {
-    gtk_main_iteration();
-  }
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-static void xsane_gamma_to_histogram(double *min, double *mid, double *max,
-                                     double contrast, double brightness, double gamma)
-{
- double m;
- double b;
-
-  m = 1.0 + contrast/100.0;
-  b = (1.0 + brightness/100.0) * 50.0;
-
-  if (m > 0)
-  {
-    *min = 50.0 - b/m;
-    *mid = (100.0 * pow(0.5, gamma)-b) / m + 50.0;
-    *max = (100.0-b)/m + 50.0;
-  }
-  else
-  {
-    *min = 0.0;
-    *mid = 50.0;
-    *max = 100.0;
-  }
-
-  xsane_bound_double(min, 0.0, 99.0);
-  xsane_bound_double(max, 1.0, 100.0);
-  xsane_bound_double(mid, *min+1, *max-1);
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-void xsane_enhancement_by_gamma(void)
-{
- double min, mid, max;
- double contrast, brightness, gamma;
-
-  xsane_gamma_to_histogram(&min, &mid, &max, xsane.contrast, xsane.brightness, xsane.gamma);
-
-  xsane.slider_gray.value[0] = min;
-  xsane.slider_gray.value[1] = mid;
-  xsane.slider_gray.value[2] = max;
-
-
-  /* red */
-  contrast   = xsane.contrast   + xsane.contrast_red;
-  brightness = xsane.brightness + xsane.brightness_red;
-  gamma      = xsane.gamma * xsane.gamma_red;
-
-  if (contrast < -100.0)
-  {
-    contrast = -100.0;
-  }
-
-  xsane_gamma_to_histogram(&min, &mid, &max, contrast, brightness, gamma);
-
-  xsane.slider_red.value[0] = min;
-  xsane.slider_red.value[1] = mid;
-  xsane.slider_red.value[2] = max;
-
-
-  /* green */
-  contrast   = xsane.contrast   + xsane.contrast_green;
-  brightness = xsane.brightness + xsane.brightness_green;
-  gamma      = xsane.gamma * xsane.gamma_green;
-
-  if (contrast < -100.0)
-  {
-    contrast = -100.0;
-  }
-
-  xsane_gamma_to_histogram(&min, &mid, &max, contrast, brightness, gamma);
-
-  xsane.slider_green.value[0] = min;
-  xsane.slider_green.value[1] = mid;
-  xsane.slider_green.value[2] = max;
-
-
-  /* blue */
-  contrast   = xsane.contrast   + xsane.contrast_blue;
-  brightness = xsane.brightness + xsane.brightness_blue;
-  gamma      = xsane.gamma * xsane.gamma_blue;
-
-  if (contrast < -100.0)
-  {
-    contrast = -100.0;
-  }
-
-  xsane_gamma_to_histogram(&min, &mid, &max,
-                           xsane.contrast + xsane.contrast_blue,
-                           xsane.brightness + xsane.brightness_blue,
-                           xsane.gamma * xsane.gamma_blue);
-
-  xsane.slider_blue.value[0] = min;
-  xsane.slider_blue.value[1] = mid;
-  xsane.slider_blue.value[2] = max;
-
-
-  xsane_enhancement_update();
-  xsane_update_gamma();
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-void xsane_enhancement_restore_default()
-{
-  xsane.gamma            = 1.0;
-  xsane.gamma_red        = 1.0;
-  xsane.gamma_green      = 1.0;
-  xsane.gamma_blue       = 1.0;
-
-  xsane.brightness       = 0.0;
-  xsane.brightness_red   = 0.0;
-  xsane.brightness_green = 0.0;
-  xsane.brightness_blue  = 0.0;
-
-  xsane.contrast         = 0.0;
-  xsane.contrast_red     = 0.0;
-  xsane.contrast_green   = 0.0;
-  xsane.contrast_blue    = 0.0;
-
-  xsane_enhancement_by_gamma();
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-void xsane_enhancement_restore()
-{
-  xsane.gamma            = preferences.xsane_gamma;
-  xsane.gamma_red        = preferences.xsane_gamma_red;
-  xsane.gamma_green      = preferences.xsane_gamma_green;
-  xsane.gamma_blue       = preferences.xsane_gamma_blue;
-
-  xsane.brightness       = preferences.xsane_brightness;
-  xsane.brightness_red   = preferences.xsane_brightness_red;
-  xsane.brightness_green = preferences.xsane_brightness_green;
-  xsane.brightness_blue  = preferences.xsane_brightness_blue;
-
-  xsane.contrast         = preferences.xsane_contrast;
-  xsane.contrast_red     = preferences.xsane_contrast_red;
-  xsane.contrast_green   = preferences.xsane_contrast_green;
-  xsane.contrast_blue    = preferences.xsane_contrast_blue;
-
-  xsane.enhancement_rgb_default = preferences.xsane_rgb_default;
-  xsane.negative                = preferences.xsane_negative;
-
-  xsane_refresh_dialog(dialog);
-  xsane_enhancement_by_gamma();
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-void xsane_enhancement_store()
-{
-  preferences.xsane_gamma            = xsane.gamma;
-  preferences.xsane_gamma_red        = xsane.gamma_red;
-  preferences.xsane_gamma_green      = xsane.gamma_green;
-  preferences.xsane_gamma_blue       = xsane.gamma_blue;
-
-  preferences.xsane_brightness       = xsane.brightness;
-  preferences.xsane_brightness_red   = xsane.brightness_red;
-  preferences.xsane_brightness_green = xsane.brightness_green;
-  preferences.xsane_brightness_blue  = xsane.brightness_blue;
-
-  preferences.xsane_contrast         = xsane.contrast;
-  preferences.xsane_contrast_red     = xsane.contrast_red;
-  preferences.xsane_contrast_green   = xsane.contrast_green;
-  preferences.xsane_contrast_blue    = xsane.contrast_blue;
-
-  preferences.xsane_rgb_default      = xsane.enhancement_rgb_default;
-  preferences.xsane_negative         = xsane.negative;
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-static void xsane_histogram_to_gamma(XsaneSlider *slider, double *contrast, double *brightness, double *gamma)
-{
- double mid;
- double range;
-
-  *contrast   = (10000.0 / (slider->value[2] - slider->value[0]) - 100.0);
-  *brightness = - (slider->value[0] - 50.0) * (*contrast + 100.0)/50.0 - 100.0;
-
-  mid   = slider->value[1] - slider->value[0];
-  range = slider->value[2] - slider->value[0];
-
-  *gamma = log(mid/range) / log(0.5);
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-void xsane_enhancement_by_histogram(void)
-{
- double gray_brightness;
- double gray_contrast;
- double gray_gamma;
- double brightness;
- double contrast;
- double gamma;
-
-  xsane_histogram_to_gamma(&xsane.slider_gray, &gray_contrast, &gray_brightness, &gray_gamma);
-
-  xsane.gamma      = gray_gamma;
-  xsane.brightness = gray_brightness;
-  xsane.contrast   = gray_contrast;
-
-  if ( (xsane.xsane_color) && (!xsane.enhancement_rgb_default) ) /* rgb sliders active */
-  {
-    if ((xsane.slider_gray.active == XSANE_SLIDER_ACTIVE) ||
-        (xsane.slider_gray.active == XSANE_SLIDER_INACTIVE)) /* gray slider not moved */
-    {
-      xsane_histogram_to_gamma(&xsane.slider_red, &contrast, &brightness, &gamma);
-
-      xsane.gamma_red        = gamma / gray_gamma;
-      xsane.brightness_red   = brightness - gray_brightness;
-      xsane.contrast_red     = contrast - gray_contrast;
-
-      xsane_histogram_to_gamma(&xsane.slider_green, &contrast, &brightness, &gamma);
-
-      xsane.gamma_green      = gamma / gray_gamma;
-      xsane.brightness_green = brightness - gray_brightness;
-      xsane.contrast_green   = contrast - gray_contrast;
-
-      xsane_histogram_to_gamma(&xsane.slider_blue, &contrast, &brightness, &gamma);
-
-      xsane.gamma_blue       = gamma / gray_gamma;
-      xsane.brightness_blue  = brightness - gray_brightness;
-      xsane.contrast_blue    = contrast - gray_contrast;
-
-      xsane_enhancement_update();
-      xsane_update_gamma();
-    }
-    else /* gray slider was moved in rgb-mode */
-    {
-      xsane_enhancement_by_gamma();
-    }
-  }
-  else /* rgb sliders not active */
-  {
-    xsane_enhancement_update();
-    xsane_update_gamma();
-  }
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-static gint xsane_histogram_win_delete(GtkWidget *widget, gpointer data)
-{
-  gtk_widget_hide(widget);
-  preferences.show_histogram = FALSE;
-  gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(xsane.show_histogram_widget), preferences.show_histogram);
-  return TRUE;
-}                                    
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-void xsane_create_histogram_dialog(const char *devicetext)
-{
- char windowname[255];
- GtkWidget *xsane_color_hbox;
- GtkWidget *xsane_histogram_vbox;  
- GdkColor color_black;
- GdkColor color_red;
- GdkColor color_green;
- GdkColor color_blue;
- GdkColor color_backg;
- GdkColormap *colormap;
- GtkStyle *style;
-
-  xsane.histogram_dialog = gtk_window_new(GTK_WINDOW_DIALOG);
-  gtk_window_set_policy(GTK_WINDOW(xsane.histogram_dialog), FALSE, FALSE, FALSE);
-  gtk_widget_set_uposition(xsane.histogram_dialog, XSANE_HISTOGRAM_POS_X, XSANE_HISTOGRAM_POS_Y);
-  gtk_signal_connect(GTK_OBJECT(xsane.histogram_dialog), "delete_event", GTK_SIGNAL_FUNC(xsane_histogram_win_delete), 0);
-  sprintf(windowname, "%s %s", WINDOW_HISTOGRAM, devicetext);
-  gtk_window_set_title(GTK_WINDOW(xsane.histogram_dialog), windowname);
-  xsane_set_window_icon(xsane.histogram_dialog, 0);
-
-  xsane_histogram_vbox = gtk_vbox_new(FALSE, 0);
-  gtk_container_set_border_width(GTK_CONTAINER(xsane_histogram_vbox), 5);
-  gtk_container_add(GTK_CONTAINER(xsane.histogram_dialog), xsane_histogram_vbox);
-  gtk_widget_show(xsane_histogram_vbox);
-
-
-  /* set gc for histogram drawing */
-  gtk_widget_realize(xsane.histogram_dialog); /* realize dialog to get colors and style */
-
-  style = gtk_widget_get_style(xsane.histogram_dialog);
-/*
-  style = gtk_rc_get_style(xsane.histogram_dialog);
-  style = gtk_widget_get_default_style();
-*/
-
-  xsane.gc_trans = style->bg_gc[GTK_STATE_NORMAL];
-  xsane.bg_trans = &style->bg[GTK_STATE_NORMAL];   
-
-  colormap = gdk_window_get_colormap(xsane.histogram_dialog->window);
-
-  xsane.gc_black  = gdk_gc_new(xsane.histogram_dialog->window);
-  color_black.red   = 0;
-  color_black.green = 0;
-  color_black.blue  = 0;
-  gdk_color_alloc(colormap, &color_black);
-  gdk_gc_set_foreground(xsane.gc_black, &color_black);
-
-  xsane.gc_red   = gdk_gc_new(xsane.histogram_dialog->window);
-  color_red.red   = 40000;
-  color_red.green = 10000;
-  color_red.blue  = 10000;
-  gdk_color_alloc(colormap, &color_red);
-  gdk_gc_set_foreground(xsane.gc_red, &color_red);
-
-  xsane.gc_green = gdk_gc_new(xsane.histogram_dialog->window);
-  color_green.red   = 10000;
-  color_green.green = 40000;
-  color_green.blue  = 10000;
-  gdk_color_alloc(colormap, &color_green);
-  gdk_gc_set_foreground(xsane.gc_green, &color_green);
-
-  xsane.gc_blue  = gdk_gc_new(xsane.histogram_dialog->window);
-  color_blue.red   = 10000;
-  color_blue.green = 10000;
-  color_blue.blue  = 40000;
-  gdk_color_alloc(colormap, &color_blue);
-  gdk_gc_set_foreground(xsane.gc_blue, &color_blue);
-
-  xsane.gc_backg  = gdk_gc_new(xsane.histogram_dialog->window);
-  color_backg.red   = 50000;
-  color_backg.green = 50000;
-  color_backg.blue  = 50000;
-  gdk_color_alloc(colormap, &color_backg);
-  gdk_gc_set_foreground(xsane.gc_backg, &color_backg);                              
-
-
-  /* add histogram images and sliders */
-
-  xsane_create_histogram(xsane_histogram_vbox, FRAME_RAW_IMAGE, 256, 100, &(xsane.histogram_raw));
-
-  xsane_separator_new(xsane_histogram_vbox, 0);
-
-  xsane.slider_gray.r = 1;
-  xsane.slider_gray.g = 1;
-  xsane.slider_gray.b = 1;
-  xsane.slider_gray.active = XSANE_SLIDER_ACTIVE;
-  xsane_create_slider(&xsane.slider_gray);
-  gtk_box_pack_start(GTK_BOX(xsane_histogram_vbox), xsane.slider_gray.preview, FALSE, FALSE, 0);
-  gtk_widget_show(xsane.slider_gray.preview);
-  gtk_widget_realize(xsane.slider_gray.preview);
-
-  xsane_separator_new(xsane_histogram_vbox, 0);
-
-  xsane.slider_red.r = 1;
-  xsane.slider_red.g = 0;
-  xsane.slider_red.b = 0;
-  xsane.slider_red.active = XSANE_SLIDER_ACTIVE;
-  xsane_create_slider(&xsane.slider_red);
-  gtk_box_pack_start(GTK_BOX(xsane_histogram_vbox), xsane.slider_red.preview, FALSE, FALSE, 0);
-  gtk_widget_show(xsane.slider_red.preview);
-  gtk_widget_realize(xsane.slider_red.preview);
-
-  xsane_separator_new(xsane_histogram_vbox, 0);
-
-  xsane.slider_green.r = 0;
-  xsane.slider_green.g = 1;
-  xsane.slider_green.b = 0;
-  xsane.slider_green.active = XSANE_SLIDER_ACTIVE;
-  xsane_create_slider(&xsane.slider_green);
-  gtk_box_pack_start(GTK_BOX(xsane_histogram_vbox), xsane.slider_green.preview, FALSE, FALSE, 0);
-  gtk_widget_show(xsane.slider_green.preview);
-  gtk_widget_realize(xsane.slider_green.preview);
-
-  xsane_separator_new(xsane_histogram_vbox, 0);
-
-  xsane.slider_blue.r = 0;
-  xsane.slider_blue.g = 0;
-  xsane.slider_blue.b = 1;
-  xsane.slider_blue.active = XSANE_SLIDER_ACTIVE;
-  xsane_create_slider(&xsane.slider_blue);
-  gtk_box_pack_start(GTK_BOX(xsane_histogram_vbox), xsane.slider_blue.preview, FALSE, FALSE, 0);
-  gtk_widget_show(xsane.slider_blue.preview);
-  gtk_widget_realize(xsane.slider_blue.preview);
-
-  xsane_draw_slider_level(&xsane.slider_gray);
-  xsane_draw_slider_level(&xsane.slider_red);
-  xsane_draw_slider_level(&xsane.slider_green);
-  xsane_draw_slider_level(&xsane.slider_blue);
-
-  xsane_separator_new(xsane_histogram_vbox, 0);           
-
-  xsane_create_histogram(xsane_histogram_vbox, FRAME_ENHANCED_IMAGE, 256, 100, &(xsane.histogram_enh));
-
-  xsane_color_hbox = gtk_hbox_new(TRUE, 5);
-  gtk_container_set_border_width(GTK_CONTAINER(xsane_color_hbox), 5);
-  gtk_container_add(GTK_CONTAINER(xsane_histogram_vbox), xsane_color_hbox);
-  gtk_widget_show(xsane_color_hbox);
-
-  xsane_toggle_button_new_with_pixmap(xsane_color_hbox, intensity_xpm, DESC_HIST_INTENSITY,
-                         &xsane.histogram_int,   xsane_histogram_toggle_button_callback);
-  xsane_toggle_button_new_with_pixmap(xsane_color_hbox, red_xpm, DESC_HIST_RED,
-                         &xsane.histogram_red,   xsane_histogram_toggle_button_callback);
-  xsane_toggle_button_new_with_pixmap(xsane_color_hbox, green_xpm, DESC_HIST_GREEN,
-                         &xsane.histogram_green, xsane_histogram_toggle_button_callback);
-  xsane_toggle_button_new_with_pixmap(xsane_color_hbox, blue_xpm, DESC_HIST_BLUE,
-                         &xsane.histogram_blue,  xsane_histogram_toggle_button_callback);
-  xsane_toggle_button_new_with_pixmap(xsane_color_hbox, pixel_xpm, DESC_HIST_PIXEL,
-                         &xsane.histogram_lines, xsane_histogram_toggle_button_callback);
-  xsane_toggle_button_new_with_pixmap(xsane_color_hbox, log_xpm, DESC_HIST_LOG,
-                         &xsane.histogram_log, xsane_histogram_toggle_button_callback);
-
-  gtk_widget_show(xsane_color_hbox);         
-
-}
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-