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gimp/app/widgets/gimpcolorbar.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 "libgimpwidgets/gimpwidgets.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpcolor/gimpcolor.h"
#include "libgimpconfig/gimpconfig.h"
#include "widgets-types.h"
#include "gimpcolorbar.h"
enum
{
PROP_0,
PROP_ORIENTATION,
PROP_COLOR,
PROP_CHANNEL
};
/* local function prototypes */
static void gimp_color_bar_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_color_bar_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static gboolean gimp_color_bar_draw (GtkWidget *widget,
cairo_t *cr);
G_DEFINE_TYPE (GimpColorBar, gimp_color_bar, GTK_TYPE_EVENT_BOX)
#define parent_class gimp_color_bar_parent_class
static void
gimp_color_bar_class_init (GimpColorBarClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
object_class->set_property = gimp_color_bar_set_property;
object_class->get_property = gimp_color_bar_get_property;
widget_class->draw = gimp_color_bar_draw;
g_object_class_install_property (object_class, PROP_ORIENTATION,
g_param_spec_enum ("orientation",
NULL, NULL,
GTK_TYPE_ORIENTATION,
GTK_ORIENTATION_HORIZONTAL,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY));
g_object_class_install_property (object_class, PROP_COLOR,
gimp_param_spec_color_from_string ("color",
NULL, NULL,
FALSE, "white",
GIMP_PARAM_WRITABLE |
G_PARAM_CONSTRUCT));
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_WRITABLE));
}
static void
gimp_color_bar_init (GimpColorBar *bar)
{
guchar *buf;
gint i;
gtk_event_box_set_visible_window (GTK_EVENT_BOX (bar), FALSE);
bar->orientation = GTK_ORIENTATION_HORIZONTAL;
for (i = 0, buf = bar->buf; i < 256; i++, buf += 3)
buf[0] = buf[1] = buf[2] = ROUND ((gdouble) i);
}
static void
gimp_color_bar_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpColorBar *bar = GIMP_COLOR_BAR (object);
switch (property_id)
{
case PROP_ORIENTATION:
bar->orientation = g_value_get_enum (value);
break;
case PROP_COLOR:
gimp_color_bar_set_color (bar, g_value_get_object (value));
break;
case PROP_CHANNEL:
gimp_color_bar_set_channel (bar, g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_color_bar_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpColorBar *bar = GIMP_COLOR_BAR (object);
switch (property_id)
{
case PROP_ORIENTATION:
g_value_set_enum (value, bar->orientation);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gboolean
gimp_color_bar_draw (GtkWidget *widget,
cairo_t *cr)
{
GimpColorBar *bar = GIMP_COLOR_BAR (widget);
GtkAllocation allocation;
cairo_surface_t *surface;
cairo_pattern_t *pattern;
guchar *src;
guchar *dest;
gint x, y;
gint width, height;
gint i;
gtk_widget_get_allocation (widget, &allocation);
x = y = gtk_container_get_border_width (GTK_CONTAINER (bar));
width = allocation.width - 2 * x;
height = allocation.height - 2 * y;
if (width < 1 || height < 1)
return TRUE;
cairo_translate (cr, x, y);
cairo_rectangle (cr, 0, 0, width, height);
cairo_clip (cr);
surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 256, 1);
for (i = 0, src = bar->buf, dest = cairo_image_surface_get_data (surface);
i < 256;
i++, src += 3, dest += 4)
{
GIMP_CAIRO_RGB24_SET_PIXEL(dest, src[0], src[1], src[2]);
}
cairo_surface_mark_dirty (surface);
pattern = cairo_pattern_create_for_surface (surface);
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REFLECT);
cairo_surface_destroy (surface);
if (bar->orientation == GTK_ORIENTATION_HORIZONTAL)
{
cairo_scale (cr, (gdouble) width / 256.0, 1.0);
}
else
{
cairo_translate (cr, 0, height);
cairo_scale (cr, 1.0, (gdouble) height / 256.0);
cairo_rotate (cr, - G_PI / 2);
}
cairo_set_source (cr, pattern);
cairo_pattern_destroy (pattern);
cairo_paint (cr);
return TRUE;
}
/* public functions */
/**
* gimp_color_bar_new:
* @orientation: whether the bar should be oriented horizontally or
* vertically
*
* Creates a new #GimpColorBar widget.
*
* Returns: The new #GimpColorBar widget.
**/
GtkWidget *
gimp_color_bar_new (GtkOrientation orientation)
{
return g_object_new (GIMP_TYPE_COLOR_BAR,
"orientation", orientation,
NULL);
}
/**
* gimp_color_bar_set_color:
* @bar: a #GimpColorBar widget
* @color: a #GeglColor
*
* Makes the @bar display a gradient from black (on the left or the
* bottom), to the given @color (on the right or at the top).
**/
void
gimp_color_bar_set_color (GimpColorBar *bar,
GeglColor *color)
{
guchar *buf;
gdouble rgb[3];
gint i;
g_return_if_fail (GIMP_IS_COLOR_BAR (bar));
g_return_if_fail (GEGL_IS_COLOR (color));
/* TODO: the whole widget is not really space aware. I am just getting the
* color in sRGB for the time being.
*/
gegl_color_get_pixel (color, babl_format ("R'G'B' double"), rgb);
for (i = 0, buf = bar->buf; i < 256; i++, buf += 3)
{
buf[0] = ROUND (rgb[0] * (gdouble) i);
buf[1] = ROUND (rgb[1] * (gdouble) i);
buf[2] = ROUND (rgb[2] * (gdouble) i);
}
gtk_widget_queue_draw (GTK_WIDGET (bar));
}
/**
* gimp_color_bar_set_channel:
* @bar: a #GimpColorBar widget
* @channel: a #GimpHistogramChannel
*
* Convenience function that calls gimp_color_bar_set_color() with the
* color that matches the @channel.
**/
void
gimp_color_bar_set_channel (GimpColorBar *bar,
GimpHistogramChannel channel)
{
GeglColor *color = NULL;
g_return_if_fail (GIMP_IS_COLOR_BAR (bar));
switch (channel)
{
case GIMP_HISTOGRAM_VALUE:
case GIMP_HISTOGRAM_LUMINANCE:
case GIMP_HISTOGRAM_ALPHA:
case GIMP_HISTOGRAM_RGB:
color = gegl_color_new ("white");
break;
case GIMP_HISTOGRAM_RED:
color = gegl_color_new ("red");
break;
case GIMP_HISTOGRAM_GREEN:
color = gegl_color_new ("lime");
break;
case GIMP_HISTOGRAM_BLUE:
color = gegl_color_new ("blue");
break;
}
g_return_if_fail (color != NULL);
gimp_color_bar_set_color (bar, color);
}
/**
* gimp_color_bar_set_buffers:
* @bar: a #GimpColorBar widget
* @red: an array of 256 values
* @green: an array of 256 values
* @blue: an array of 256 values
*
* This function gives full control over the colors displayed by the
* @bar widget. The 3 arrays can for example be taken from a #Levels
* or a #Curves struct.
**/
void
gimp_color_bar_set_buffers (GimpColorBar *bar,
const guchar *red,
const guchar *green,
const guchar *blue)
{
guchar *buf;
gint i;
g_return_if_fail (GIMP_IS_COLOR_BAR (bar));
g_return_if_fail (red != NULL);
g_return_if_fail (green != NULL);
g_return_if_fail (blue != NULL);
for (i = 0, buf = bar->buf; i < 256; i++, buf += 3)
{
buf[0] = red[i];
buf[1] = green[i];
buf[2] = blue[i];
}
gtk_widget_queue_draw (GTK_WIDGET (bar));
}
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