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gimp/app/widgets/gimphistogramview.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <gtk/gtk.h>
#include "libgimpmath/gimpmath.h"
#include "widgets-types.h"
#include "base/gimphistogram.h"
#include "core/gimpmarshal.h"
#include "gimphistogramview.h"
#define MIN_WIDTH 64
#define MIN_HEIGHT 64
enum
{
RANGE_CHANGED,
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_CHANNEL,
PROP_SCALE,
PROP_BORDER_WIDTH,
PROP_SUBDIVISIONS
};
static void gimp_histogram_view_class_init (GimpHistogramViewClass *klass);
static void gimp_histogram_view_init (GimpHistogramView *view);
static void gimp_histogram_view_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_histogram_view_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_histogram_view_size_request (GtkWidget *widget,
GtkRequisition *requisition);
static gboolean gimp_histogram_view_expose (GtkWidget *widget,
GdkEventExpose *event);
static gboolean gimp_histogram_view_button_press (GtkWidget *widget,
GdkEventButton *bevent);
static gboolean gimp_histogram_view_button_release (GtkWidget *widget,
GdkEventButton *bevent);
static gboolean gimp_histogram_view_motion_notify (GtkWidget *widget,
GdkEventMotion *bevent);
static guint histogram_view_signals[LAST_SIGNAL] = { 0 };
static GtkDrawingAreaClass *parent_class = NULL;
GType
gimp_histogram_view_get_type (void)
{
static GType view_type = 0;
if (! view_type)
{
static const GTypeInfo view_info =
{
sizeof (GimpHistogramViewClass),
NULL, /* base_init */
NULL, /* base_finalize */
(GClassInitFunc) gimp_histogram_view_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpHistogramView),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_histogram_view_init,
};
view_type = g_type_register_static (GTK_TYPE_DRAWING_AREA,
"GimpHistogramView",
&view_info, 0);
}
return view_type;
}
static void
gimp_histogram_view_class_init (GimpHistogramViewClass *klass)
{
GObjectClass *object_class;
GtkWidgetClass *widget_class;
parent_class = g_type_class_peek_parent (klass);
object_class = G_OBJECT_CLASS (klass);
widget_class = GTK_WIDGET_CLASS (klass);
histogram_view_signals[RANGE_CHANGED] =
g_signal_new ("range_changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpHistogramViewClass, range_changed),
NULL, NULL,
gimp_marshal_VOID__INT_INT,
G_TYPE_NONE, 2,
G_TYPE_INT,
G_TYPE_INT);
object_class->get_property = gimp_histogram_view_get_property;
object_class->set_property = gimp_histogram_view_set_property;
widget_class->size_request = gimp_histogram_view_size_request;
widget_class->expose_event = gimp_histogram_view_expose;
widget_class->button_press_event = gimp_histogram_view_button_press;
widget_class->button_release_event = gimp_histogram_view_button_release;
widget_class->motion_notify_event = gimp_histogram_view_motion_notify;
klass->range_changed = NULL;
g_object_class_install_property (object_class, PROP_CHANNEL,
g_param_spec_enum ("histogram-channel", NULL, NULL,
GIMP_TYPE_HISTOGRAM_CHANNEL,
GIMP_HISTOGRAM_VALUE,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_SCALE,
g_param_spec_enum ("histogram-scale", NULL, NULL,
GIMP_TYPE_HISTOGRAM_SCALE,
GIMP_HISTOGRAM_SCALE_LINEAR,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_BORDER_WIDTH,
g_param_spec_int ("border-width", NULL, NULL,
0, 32, 1,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_SUBDIVISIONS,
g_param_spec_int ("subdivisions",
NULL, NULL,
1, 64, 5,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
}
static void
gimp_histogram_view_init (GimpHistogramView *view)
{
view->histogram = NULL;
view->start = 0;
view->end = 255;
}
static void
gimp_histogram_view_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (object);
switch (property_id)
{
case PROP_CHANNEL:
view->channel = g_value_get_enum (value);
gtk_widget_queue_draw (GTK_WIDGET (view));
break;
case PROP_SCALE:
view->scale = g_value_get_enum (value);
gtk_widget_queue_draw (GTK_WIDGET (view));
break;
case PROP_BORDER_WIDTH:
view->border_width = g_value_get_int (value);
gtk_widget_queue_resize (GTK_WIDGET (view));
break;
case PROP_SUBDIVISIONS:
view->subdivisions = g_value_get_int (value);
gtk_widget_queue_draw (GTK_WIDGET (view));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_histogram_view_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (object);
switch (property_id)
{
case PROP_CHANNEL:
g_value_set_enum (value, view->channel);
break;
case PROP_SCALE:
g_value_set_enum (value, view->scale);
break;
case PROP_BORDER_WIDTH:
g_value_set_int (value, view->border_width);
break;
case PROP_SUBDIVISIONS:
g_value_set_int (value, view->subdivisions);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_histogram_view_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (widget);
requisition->width = MIN_WIDTH + 2 * view->border_width;
requisition->height = MIN_HEIGHT + 2 * view->border_width;
}
static gboolean
gimp_histogram_view_expose (GtkWidget *widget,
GdkEventExpose *event)
{
GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (widget);
gint x, y;
gint x1, x2;
gint border;
gint width, height;
gdouble max;
gint xstop;
if (! view->histogram)
return FALSE;
border = view->border_width;
width = widget->allocation.width - 2 * border;
height = widget->allocation.height - 2 * border;
/* find the maximum value */
max = gimp_histogram_get_maximum (view->histogram, view->channel);
switch (view->scale)
{
case GIMP_HISTOGRAM_SCALE_LINEAR:
break;
case GIMP_HISTOGRAM_SCALE_LOGARITHMIC:
if (max > 0.0)
max = log (max);
else
max = 1.0;
break;
}
x1 = CLAMP (MIN (view->start, view->end), 0, 255);
x2 = CLAMP (MAX (view->start, view->end), 0, 255);
/* Draw the background */
gdk_draw_rectangle (widget->window,
widget->style->base_gc[GTK_STATE_NORMAL], TRUE,
0, 0,
widget->allocation.width,
widget->allocation.height);
/* Draw the outer border */
gdk_draw_rectangle (widget->window,
widget->style->dark_gc[GTK_STATE_NORMAL], FALSE,
border, border,
width - 1, height - 1);
/* Draw the spikes */
xstop = 1;
for (x = 0; x < width; x++)
{
gdouble value = 0.0;
gint i, j;
gboolean in_selection = FALSE;
GdkGC *spike_gc;
i = (x * 256) / width;
j = ((x + 1) * 256) / width;
do
{
gdouble v;
if (! in_selection)
in_selection = ((x1 != 0 || x2 != 255) && x1 <= i && i <= x2);
v = gimp_histogram_get_value (view->histogram, view->channel, i++);
if (v > value)
value = v;
}
while (i < j);
if (view->subdivisions > 1 && x >= (xstop * width / view->subdivisions))
{
gdk_draw_line (widget->window,
widget->style->dark_gc[GTK_STATE_NORMAL],
x + border, border,
x + border, border + height - 1);
xstop++;
}
else if (in_selection)
{
gdk_draw_line (widget->window,
widget->style->base_gc[GTK_STATE_SELECTED],
x + border, border,
x + border, border + height - 1);
}
if (value <= 0.0)
continue;
switch (view->scale)
{
case GIMP_HISTOGRAM_SCALE_LINEAR:
y = (gint) (((height - 1) * value) / max);
break;
case GIMP_HISTOGRAM_SCALE_LOGARITHMIC:
y = (gint) (((height - 1) * log (value)) / max);
break;
default:
y = 0;
break;
}
if (in_selection)
{
if (view->light_histogram)
spike_gc = widget->style->mid_gc[GTK_STATE_SELECTED];
else
spike_gc = widget->style->text_gc[GTK_STATE_SELECTED];
}
else
{
if (view->light_histogram)
spike_gc = widget->style->mid_gc[GTK_STATE_NORMAL];
else
spike_gc = widget->style->text_gc[GTK_STATE_NORMAL];
}
gdk_draw_line (widget->window,
spike_gc,
x + border, height + border - 1,
x + border, height + border - y - 1);
}
return FALSE;
}
static gboolean
gimp_histogram_view_button_press (GtkWidget *widget,
GdkEventButton *bevent)
{
GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (widget);
if (bevent->type == GDK_BUTTON_PRESS && bevent->button == 1)
{
gint width;
gdk_pointer_grab (widget->window, FALSE,
GDK_BUTTON_RELEASE_MASK | GDK_BUTTON1_MOTION_MASK,
NULL, NULL, bevent->time);
width = widget->allocation.width - 2 * view->border_width;
view->start = CLAMP ((((bevent->x - view->border_width) * 256) / width),
0, 255);
view->end = view->start;
gtk_widget_queue_draw (widget);
}
return TRUE;
}
static gboolean
gimp_histogram_view_button_release (GtkWidget *widget,
GdkEventButton *bevent)
{
GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (widget);
if (bevent->button == 1)
{
gint start, end;
gdk_display_pointer_ungrab (gtk_widget_get_display (GTK_WIDGET (view)),
bevent->time);
start = view->start;
end = view->end;
view->start = MIN (start, end);
view->end = MAX (start, end);
g_signal_emit (view, histogram_view_signals[RANGE_CHANGED], 0,
view->start, view->end);
}
return TRUE;
}
static gboolean
gimp_histogram_view_motion_notify (GtkWidget *widget,
GdkEventMotion *mevent)
{
GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (widget);
gint width;
width = widget->allocation.width - 2 * view->border_width;
view->start = CLAMP ((((mevent->x - view->border_width) * 256) / width),
0, 255);
gtk_widget_queue_draw (widget);
return TRUE;
}
GtkWidget *
gimp_histogram_view_new (gboolean range)
{
GtkWidget *view = g_object_new (GIMP_TYPE_HISTOGRAM_VIEW, NULL);
if (range)
gtk_widget_add_events (view,
GDK_BUTTON_PRESS_MASK |
GDK_BUTTON_RELEASE_MASK |
GDK_BUTTON1_MOTION_MASK);
return view;
}
void
gimp_histogram_view_set_histogram (GimpHistogramView *view,
GimpHistogram *histogram)
{
g_return_if_fail (GIMP_IS_HISTOGRAM_VIEW (view));
if (view->histogram != histogram)
{
view->histogram = histogram;
if (histogram && view->channel >= gimp_histogram_n_channels (histogram))
gimp_histogram_view_set_channel (view, GIMP_HISTOGRAM_VALUE);
}
gtk_widget_queue_draw (GTK_WIDGET (view));
}
GimpHistogram *
gimp_histogram_view_get_histogram (GimpHistogramView *view)
{
g_return_val_if_fail (GIMP_IS_HISTOGRAM_VIEW (view), NULL);
return view->histogram;
}
void
gimp_histogram_view_set_channel (GimpHistogramView *view,
GimpHistogramChannel channel)
{
g_return_if_fail (GIMP_IS_HISTOGRAM_VIEW (view));
g_object_set (view, "histogram-channel", channel, NULL);
}
GimpHistogramChannel
gimp_histogram_view_get_channel (GimpHistogramView *view)
{
g_return_val_if_fail (GIMP_IS_HISTOGRAM_VIEW (view), 0);
return view->channel;
}
void
gimp_histogram_view_set_scale (GimpHistogramView *view,
GimpHistogramScale scale)
{
g_return_if_fail (GIMP_IS_HISTOGRAM_VIEW (view));
g_object_set (view, "histogram-scale", scale, NULL);
}
GimpHistogramScale
gimp_histogram_view_get_scale (GimpHistogramView *view)
{
g_return_val_if_fail (GIMP_IS_HISTOGRAM_VIEW (view), 0);
return view->scale;
}
void
gimp_histogram_view_set_range (GimpHistogramView *view,
gint start,
gint end)
{
g_return_if_fail (GIMP_IS_HISTOGRAM_VIEW (view));
view->start = MIN (start, end);
view->end = MAX (start, end);
gtk_widget_queue_draw (GTK_WIDGET (view));
g_signal_emit (view, histogram_view_signals[RANGE_CHANGED], 0,
view->start, view->end);
}
void
gimp_histogram_view_get_range (GimpHistogramView *view,
gint *start,
gint *end)
{
g_return_if_fail (GIMP_IS_HISTOGRAM_VIEW (view));
if (start) *start = view->start;
if (end) *end = view->end;
}
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