mirror of https://github.com/GNOME/gimp.git
324 lines
7.8 KiB
C
324 lines
7.8 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <gtk/gtk.h>
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#include "libgimpmath/gimpmath.h"
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#include "widgets-types.h"
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#include "base/gimphistogram.h"
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#include "core/gimpmarshal.h"
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#include "gimphistogramview.h"
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#define WAITING 0
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#define WORKING 1
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#define WORK_DELAY 1
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#define HISTOGRAM_MASK GDK_EXPOSURE_MASK | \
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GDK_BUTTON_PRESS_MASK | \
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GDK_BUTTON_RELEASE_MASK | \
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GDK_BUTTON1_MOTION_MASK
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#define HISTOGRAM 0x1
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#define RANGE 0x2
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#define ALL 0xF
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enum
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{
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RANGE_CHANGED,
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LAST_SIGNAL
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};
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static void gimp_histogram_view_class_init (GimpHistogramViewClass *klass);
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static void gimp_histogram_view_init (GimpHistogramView *view);
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static guint histogram_view_signals[LAST_SIGNAL] = { 0 };
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static GtkDrawingAreaClass *parent_class = NULL;
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GType
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gimp_histogram_view_get_type (void)
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{
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static GType view_type = 0;
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if (! view_type)
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{
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static const GTypeInfo view_info =
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{
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sizeof (GimpHistogramViewClass),
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NULL, /* base_init */
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NULL, /* base_finalize */
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(GClassInitFunc) gimp_histogram_view_class_init,
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NULL, /* class_finalize */
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NULL, /* class_data */
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sizeof (GimpHistogramView),
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0, /* n_preallocs */
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(GInstanceInitFunc) gimp_histogram_view_init,
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};
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view_type = g_type_register_static (GTK_TYPE_DRAWING_AREA,
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"GimpHistogramView",
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&view_info, 0);
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}
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return view_type;
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}
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static void
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gimp_histogram_view_class_init (GimpHistogramViewClass *klass)
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{
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parent_class = g_type_class_peek_parent (klass);
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histogram_view_signals[RANGE_CHANGED] =
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g_signal_new ("range_changed",
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_FIRST,
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G_STRUCT_OFFSET (GimpHistogramViewClass, range_changed),
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NULL, NULL,
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gimp_marshal_VOID__INT_INT,
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G_TYPE_NONE, 2,
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G_TYPE_INT,
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G_TYPE_INT);
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klass->range_changed = NULL;
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}
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static void
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gimp_histogram_view_init (GimpHistogramView *view)
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{
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view->histogram = NULL;
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view->channel = GIMP_HISTOGRAM_VALUE;
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view->start = 0;
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view->end = 255;
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}
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static void
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gimp_histogram_view_draw (GimpHistogramView *view,
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gint update)
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{
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GtkWidget *widget;
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gdouble max;
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gdouble v;
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gint i, x, y;
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gint x1, x2;
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gint width, height;
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widget = GTK_WIDGET (view);
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width = widget->allocation.width - 2;
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height = widget->allocation.height - 2;
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if (update & HISTOGRAM)
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{
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/* find the maximum value */
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max = gimp_histogram_get_maximum (view->histogram,
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view->channel);
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if (max > 0.0)
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max = log (max);
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else
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max = 1.0;
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/* clear the histogram */
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gdk_window_clear (widget->window);
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/* Draw the axis */
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gdk_draw_line (widget->window,
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widget->style->black_gc,
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1, height + 1, width, height + 1);
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/* Draw the spikes */
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for (i = 0; i < 256; i++)
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{
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x = (width * i) / 256 + 1;
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v = gimp_histogram_get_value (view->histogram,
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view->channel, i);
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if (v > 0.0)
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y = (int) ((height * log (v)) / max);
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else
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y = 0;
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gdk_draw_line (widget->window,
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widget->style->black_gc,
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x, height + 1,
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x, height + 1 - y);
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}
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}
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if ((update & RANGE) && view->start >= 0)
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{
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x1 = (width * MIN (view->start, view->end)) / 256 + 1;
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x2 = (width * MAX (view->start, view->end)) / 256 + 1;
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gdk_gc_set_function (widget->style->black_gc, GDK_INVERT);
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gdk_draw_rectangle (widget->window,
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widget->style->black_gc, TRUE,
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x1, 1, (x2 - x1) + 1, height);
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gdk_gc_set_function (widget->style->black_gc, GDK_COPY);
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}
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}
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static gint
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gimp_histogram_view_events (GimpHistogramView *view,
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GdkEvent *event)
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{
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GtkWidget *widget;
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GdkEventButton *bevent;
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GdkEventMotion *mevent;
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gint width;
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widget = GTK_WIDGET (view);
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switch (event->type)
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{
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case GDK_EXPOSE:
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gimp_histogram_view_draw (view, ALL);
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break;
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case GDK_BUTTON_PRESS:
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bevent = (GdkEventButton *) event;
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if (bevent->button != 1)
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break;
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gdk_pointer_grab (widget->window, FALSE,
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GDK_BUTTON_RELEASE_MASK | GDK_BUTTON1_MOTION_MASK,
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NULL, NULL, bevent->time);
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width = widget->allocation.width - 2;
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gimp_histogram_view_draw (view, RANGE);
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view->start = CLAMP ((((bevent->x - 1) * 256) / width), 0, 255);
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view->end = view->start;
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gimp_histogram_view_draw (view, RANGE);
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break;
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case GDK_BUTTON_RELEASE:
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bevent = (GdkEventButton *) event;
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gdk_pointer_ungrab (bevent->time);
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g_signal_emit (G_OBJECT (view),
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histogram_view_signals[RANGE_CHANGED], 0,
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MIN (view->start, view->end),
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MAX (view->start, view->end));
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break;
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case GDK_MOTION_NOTIFY:
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mevent = (GdkEventMotion *) event;
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width = widget->allocation.width - 2;
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gimp_histogram_view_draw (view, RANGE);
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view->start = CLAMP ((((mevent->x - 1) * 256) / width), 0, 255);
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gimp_histogram_view_draw (view, RANGE);
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break;
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default:
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break;
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}
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return FALSE;
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}
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GimpHistogramView *
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gimp_histogram_view_new (gint width,
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gint height)
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{
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GimpHistogramView *view;
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view = g_object_new (GIMP_TYPE_HISTOGRAM_VIEW, NULL);
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gtk_drawing_area_size (GTK_DRAWING_AREA (view), width + 2, height + 2);
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gtk_widget_set_events (GTK_WIDGET (view), HISTOGRAM_MASK);
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g_signal_connect (G_OBJECT (view), "event",
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G_CALLBACK (gimp_histogram_view_events),
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view);
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return view;
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}
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void
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gimp_histogram_view_update (GimpHistogramView *view,
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GimpHistogram *histogram)
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{
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view->histogram = histogram;
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if (! histogram)
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return;
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if (view->channel >= gimp_histogram_nchannels (histogram))
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gimp_histogram_view_channel (view, 0);
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gtk_widget_draw (GTK_WIDGET (view), NULL);
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g_signal_emit (G_OBJECT (view),
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histogram_view_signals[RANGE_CHANGED], 0,
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MIN (view->start, view->end),
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MAX (view->start, view->end));
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}
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void
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gimp_histogram_view_range (GimpHistogramView *view,
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gint start,
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gint end)
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{
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gimp_histogram_view_draw (view, RANGE);
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view->start = start;
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view->end = end;
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gimp_histogram_view_draw (view, RANGE);
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}
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void
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gimp_histogram_view_channel (GimpHistogramView *view,
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gint channel)
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{
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view->channel = channel;
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gimp_histogram_view_draw (view, ALL);
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g_signal_emit (G_OBJECT (view),
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histogram_view_signals[RANGE_CHANGED], 0,
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MIN (view->start, view->end),
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MAX (view->start, view->end));
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}
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GimpHistogram *
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gimp_histogram_view_histogram (GimpHistogramView *view)
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{
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g_return_val_if_fail (GIMP_IS_HISTOGRAM_VIEW (view), NULL);
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return view->histogram;
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}
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