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gimp/app/widgets/gimphistogramview.c

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/* GIMP - The GNU 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 3 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, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "widgets-types.h"
#include "core/gimphistogram.h"
#include "core/gimpmarshal.h"
#include "gimphistogramview.h"
#include "gimpwidgets-utils.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_dispose (GObject *object);
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_get_preferred_width (GtkWidget *widget,
gint *minimum_width,
gint *natural_width);
static void gimp_histogram_view_get_preferred_height (GtkWidget *widget,
gint *minimum_height,
gint *natural_height);
static gboolean gimp_histogram_view_draw (GtkWidget *widget,
cairo_t *cr);
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 void gimp_histogram_view_notify (GimpHistogram *histogram,
const GParamSpec *pspec,
GimpHistogramView *view);
static void gimp_histogram_view_update_bins (GimpHistogramView *view);
static void gimp_histogram_view_draw_spike (GimpHistogramView *view,
GimpHistogramChannel channel,
cairo_t *cr,
const GdkRGBA *fg_color,
cairo_operator_t fg_operator,
const GdkRGBA *bg_color,
gint x,
gint i,
gint j,
gdouble max,
gdouble bg_max,
gint height,
gint border);
G_DEFINE_TYPE (GimpHistogramView, gimp_histogram_view,
GTK_TYPE_DRAWING_AREA)
#define parent_class gimp_histogram_view_parent_class
static guint histogram_view_signals[LAST_SIGNAL] = { 0 };
static void
gimp_histogram_view_class_init (GimpHistogramViewClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *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->dispose = gimp_histogram_view_dispose;
object_class->get_property = gimp_histogram_view_get_property;
object_class->set_property = gimp_histogram_view_set_property;
widget_class->get_preferred_width = gimp_histogram_view_get_preferred_width;
widget_class->get_preferred_height = gimp_histogram_view_get_preferred_height;
widget_class->draw = gimp_histogram_view_draw;
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,
GIMP_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,
GIMP_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,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_SUBDIVISIONS,
g_param_spec_int ("subdivisions",
NULL, NULL,
1, 64, 5,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
}
static void
gimp_histogram_view_init (GimpHistogramView *view)
{
view->histogram = NULL;
view->bg_histogram = NULL;
view->n_bins = 256;
view->start = 0;
view->end = 255;
}
static void
gimp_histogram_view_dispose (GObject *object)
{
GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (object);
gimp_histogram_view_set_histogram (view, NULL);
gimp_histogram_view_set_background (view, NULL);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
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_get_preferred_width (GtkWidget *widget,
gint *minimum_width,
gint *natural_width)
{
GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (widget);
*minimum_width = *natural_width = MIN_WIDTH + 2 * view->border_width;
}
static void
gimp_histogram_view_get_preferred_height (GtkWidget *widget,
gint *minimum_height,
gint *natural_height)
{
GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (widget);
*minimum_height = *natural_height = MIN_HEIGHT + 2 * view->border_width;
}
static gdouble
gimp_histogram_view_get_maximum (GimpHistogramView *view,
GimpHistogram *histogram,
GimpHistogramChannel channel)
{
gdouble max = gimp_histogram_get_maximum (histogram, 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;
}
return max;
}
static gboolean
gimp_histogram_view_draw (GtkWidget *widget,
cairo_t *cr)
{
GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (widget);
GtkStyleContext *style = gtk_widget_get_style_context (widget);
GtkAllocation allocation;
gint x;
gint x1, x2;
gint border;
gint width, height;
gdouble max = 0.0;
gdouble bg_max = 0.0;
gint xstop;
GdkRGBA grid_color;
GdkRGBA color_in;
GdkRGBA color_out;
GdkRGBA bg_color_in;
GdkRGBA bg_color_out;
GdkRGBA rgb_color[3];
gtk_widget_get_allocation (widget, &allocation);
gtk_style_context_save (style);
gtk_style_context_add_class (style, "view");
gtk_render_background (style, cr, 0, 0,
allocation.width, allocation.height);
border = view->border_width;
width = allocation.width - 2 * border;
height = allocation.height - 2 * border;
cairo_set_line_width (cr, 1.0);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
cairo_translate (cr, 0.5, 0.5);
/* Draw the outer border */
gtk_style_context_add_class (style, "grid");
gtk_style_context_get_color (style, gtk_style_context_get_state (style),
&grid_color);
gtk_style_context_remove_class (style, "grid");
gdk_cairo_set_source_rgba (cr, &grid_color);
cairo_rectangle (cr, border, border, width - 1, height - 1);
cairo_stroke (cr);
if (! view->histogram && ! view->bg_histogram)
{
gtk_style_context_restore (style);
return FALSE;
}
x1 = CLAMP (MIN (view->start, view->end), 0, view->n_bins - 1);
x2 = CLAMP (MAX (view->start, view->end), 0, view->n_bins - 1);
if (view->histogram)
max = gimp_histogram_view_get_maximum (view, view->histogram,
view->channel);
if (view->bg_histogram)
bg_max = gimp_histogram_view_get_maximum (view, view->bg_histogram,
view->channel);
gtk_style_context_get_color (style, gtk_style_context_get_state (style),
&color_out);
bg_color_out = color_out;
bg_color_out.alpha = 0.5;
gtk_style_context_save (style);
gtk_style_context_set_state (style, GTK_STATE_FLAG_SELECTED);
gtk_style_context_get_color (style, gtk_style_context_get_state (style),
&color_in);
bg_color_in = color_in;
bg_color_in.alpha = 0.5;
gtk_style_context_restore (style);
if (view->channel == GIMP_HISTOGRAM_RGB)
{
for (x = 0; x < 3; x++)
{
rgb_color[x].red = (x == 0 ? 1.0 : 0.0);
rgb_color[x].green = (x == 1 ? 1.0 : 0.0);
rgb_color[x].blue = (x == 2 ? 1.0 : 0.0);
rgb_color[x].alpha = 1.0;
}
}
xstop = 1;
for (x = 0; x < width; x++)
{
gboolean in_selection = FALSE;
gint i = (x * view->n_bins) / width;
gint j = ((x + 1) * view->n_bins) / width;
if (! (x1 == 0 && x2 == (view->n_bins - 1)))
{
gint k = i;
do
in_selection |= (x1 <= k && k <= x2);
while (++k < j);
}
if (view->subdivisions > 1 && x >= (xstop * width / view->subdivisions))
{
gdk_cairo_set_source_rgba (cr, &grid_color);
cairo_move_to (cr, x + border, border);
cairo_line_to (cr, x + border, border + height - 1);
cairo_stroke (cr);
xstop++;
}
else if (in_selection)
{
gtk_style_context_save (style);
gtk_style_context_set_state (style, GTK_STATE_FLAG_SELECTED);
gtk_render_background (style, cr,
x + border, border,
1, height - 1);
gtk_style_context_restore (style);
}
if (view->channel == GIMP_HISTOGRAM_RGB)
{
GdkRGBA black = { 0.0, 0.0, 0.0, 1.0 };
gint c;
for (c = 0; c < 3; c++)
gimp_histogram_view_draw_spike (view, GIMP_HISTOGRAM_RED + c, cr,
&black,
CAIRO_OPERATOR_OVER,
NULL,
x, i, j, max, bg_max, height, border);
for (c = 0; c < 3; c++)
gimp_histogram_view_draw_spike (view, GIMP_HISTOGRAM_RED + c, cr,
&rgb_color[c],
CAIRO_OPERATOR_ADD,
NULL,
x, i, j, max, bg_max, height, border);
gimp_histogram_view_draw_spike (view, view->channel, cr,
in_selection ? &color_in : &color_out,
CAIRO_OPERATOR_OVER,
NULL,
x, i, j, max, bg_max, height, border);
}
else
{
gimp_histogram_view_draw_spike (view, view->channel, cr,
in_selection ? &color_in : &color_out,
CAIRO_OPERATOR_OVER,
in_selection ? &bg_color_in : &bg_color_out,
x, i, j, max, bg_max, height, border);
}
}
gtk_style_context_restore (style);
return FALSE;
}
static void
gimp_histogram_view_draw_spike (GimpHistogramView *view,
GimpHistogramChannel channel,
cairo_t *cr,
const GdkRGBA *fg_color,
cairo_operator_t fg_operator,
const GdkRGBA *bg_color,
gint x,
gint i,
gint j,
gdouble max,
gdouble bg_max,
gint height,
gint border)
{
gdouble value = 0.0;
gdouble bg_value = 0.0;
gint y;
gint bg_y;
if (view->histogram)
{
gint ii = i;
do
{
gdouble v = gimp_histogram_get_value (view->histogram,
channel, ii++);
if (v > value)
value = v;
}
while (ii < j);
}
if (bg_color && view->bg_histogram)
{
gint ii = i;
do
{
gdouble v = gimp_histogram_get_value (view->bg_histogram,
channel, ii++);
if (v > bg_value)
bg_value = v;
}
while (ii < j);
}
if (value <= 0.0 && bg_value <= 0.0)
return;
switch (view->scale)
{
case GIMP_HISTOGRAM_SCALE_LINEAR:
y = (gint) (((height - 2) * value) / max);
bg_y = (gint) (((height - 2) * bg_value) / bg_max);
break;
case GIMP_HISTOGRAM_SCALE_LOGARITHMIC:
y = (gint) (((height - 2) * log (value)) / max);
bg_y = (gint) (((height - 2) * log (bg_value)) / bg_max);
break;
default:
y = 0;
bg_y = 0;
break;
}
y = MAX (y, 0);
bg_y = MAX (bg_y, 0);
if (bg_color)
{
gdk_cairo_set_source_rgba (cr, bg_color);
cairo_move_to (cr, x + border, height + border - 1);
cairo_line_to (cr, x + border, height + border - bg_y - 1);
cairo_stroke (cr);
}
cairo_set_operator (cr, fg_operator);
gdk_cairo_set_source_rgba (cr, fg_color);
cairo_move_to (cr, x + border, height + border - 1);
cairo_line_to (cr, x + border, height + border - y - 1);
cairo_stroke (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
}
static gboolean
gimp_histogram_view_button_press (GtkWidget *widget,
GdkEventButton *bevent)
{
GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (widget);
if (! view->grab_seat &&
bevent->type == GDK_BUTTON_PRESS && bevent->button == 1)
{
GdkSeat *seat = gdk_event_get_seat ((GdkEvent *) bevent);
GtkAllocation allocation;
gint width;
if (gdk_seat_grab (seat, gtk_widget_get_window (widget),
GDK_SEAT_CAPABILITY_ALL, FALSE,
NULL, (GdkEvent *) bevent,
NULL, NULL) != GDK_GRAB_SUCCESS)
{
return TRUE;
}
view->grab_seat = seat;
gtk_widget_get_allocation (widget, &allocation);
width = allocation.width - 2 * view->border_width;
view->start = CLAMP (((bevent->x - view->border_width) * view->n_bins) / width,
0, view->n_bins - 1);
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 (gdk_event_get_seat ((GdkEvent *) bevent) == view->grab_seat &&
bevent->button == 1)
{
gint start, end;
gdk_seat_ungrab (view->grab_seat);
view->grab_seat = NULL;
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);
GtkAllocation allocation;
gint width;
if (gdk_event_get_seat ((GdkEvent *) mevent) == view->grab_seat)
{
gtk_widget_get_allocation (widget, &allocation);
width = allocation.width - 2 * view->border_width;
view->start = CLAMP (((mevent->x - view->border_width) * view->n_bins) / width,
0, view->n_bins - 1);
gtk_widget_queue_draw (widget);
}
return TRUE;
}
/* public functions */
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 0
g_return_if_fail (histogram == NULL ||
view->bg_histogram == NULL ||
gimp_histogram_n_components (view->bg_histogram) ==
gimp_histogram_n_components (histogram));
#endif
if (view->histogram != histogram)
{
if (view->histogram)
{
g_signal_handlers_disconnect_by_func (view->histogram,
gimp_histogram_view_notify,
view);
g_object_unref (view->histogram);
}
view->histogram = histogram;
if (histogram)
{
g_object_ref (histogram);
g_signal_connect (histogram, "notify",
G_CALLBACK (gimp_histogram_view_notify),
view);
if (! gimp_histogram_has_channel (histogram, view->channel))
gimp_histogram_view_set_channel (view, GIMP_HISTOGRAM_VALUE);
}
gimp_histogram_view_update_bins (view);
}
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_background (GimpHistogramView *view,
GimpHistogram *histogram)
{
g_return_if_fail (GIMP_IS_HISTOGRAM_VIEW (view));
#if 0
g_return_if_fail (histogram == NULL ||
view->histogram == NULL ||
gimp_histogram_n_components (view->histogram) ==
gimp_histogram_n_components (histogram));
#endif
if (view->bg_histogram != histogram)
{
if (view->bg_histogram)
{
g_signal_handlers_disconnect_by_func (view->bg_histogram,
gimp_histogram_view_notify,
view);
g_object_unref (view->bg_histogram);
}
view->bg_histogram = histogram;
if (histogram)
{
g_object_ref (histogram);
g_signal_connect (histogram, "notify",
G_CALLBACK (gimp_histogram_view_notify),
view);
if (! gimp_histogram_has_channel (histogram, view->channel))
gimp_histogram_view_set_channel (view, GIMP_HISTOGRAM_VALUE);
}
gimp_histogram_view_update_bins (view);
}
gtk_widget_queue_draw (GTK_WIDGET (view));
}
GimpHistogram *
gimp_histogram_view_get_background (GimpHistogramView *view)
{
g_return_val_if_fail (GIMP_IS_HISTOGRAM_VIEW (view), NULL);
return view->bg_histogram;
}
void
gimp_histogram_view_set_channel (GimpHistogramView *view,
GimpHistogramChannel channel)
{
g_return_if_fail (GIMP_IS_HISTOGRAM_VIEW (view));
if (channel != view->channel)
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));
if (scale != view->scale)
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));
if (view->start != MIN (start, end) ||
view->end != MAX (start, end))
{
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;
}
/* private functions */
static void
gimp_histogram_view_notify (GimpHistogram *histogram,
const GParamSpec *pspec,
GimpHistogramView *view)
{
if (! strcmp (pspec->name, "n-bins"))
{
gimp_histogram_view_update_bins (view);
}
else
{
gtk_widget_queue_draw (GTK_WIDGET (view));
}
}
static void
gimp_histogram_view_update_bins (GimpHistogramView *view)
{
gint new_bins = 0;
if (view->histogram)
new_bins = gimp_histogram_n_bins (view->histogram);
else if (view->bg_histogram)
new_bins = gimp_histogram_n_bins (view->bg_histogram);
if (new_bins > 0 && new_bins != view->n_bins)
{
view->start = MIN (ROUND ((gdouble) view->start *
new_bins / view->n_bins),
new_bins - 1);
view->end = MAX (ROUND ((gdouble) (view->end + 1) *
new_bins / view->n_bins) - 1,
0);
view->n_bins = new_bins;
g_signal_emit (view, histogram_view_signals[RANGE_CHANGED], 0,
view->start, view->end);
}
}
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