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-rw-r--r--frontend/xsane-gamma.c1541
1 files changed, 1541 insertions, 0 deletions
diff --git a/frontend/xsane-gamma.c b/frontend/xsane-gamma.c
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+++ b/frontend/xsane-gamma.c
@@ -0,0 +1,1541 @@
+/* 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);
+
+}
+
+/* ---------------------------------------------------------------------------------------------------------------------- */
+