mirror of https://github.com/GNOME/gimp.git
307 lines
8.6 KiB
C
307 lines
8.6 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 <string.h>
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#include <gtk/gtk.h>
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#include "libgimpconfig/gimpconfig.h"
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#include "libgimpcolor/gimpcolor.h"
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#include "widgets-types.h"
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#include "gimpcolorbar.h"
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enum
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{
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PROP_0,
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PROP_ORIENTATION,
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PROP_COLOR,
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PROP_CHANNEL
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};
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/* local function prototypes */
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static void gimp_color_bar_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec);
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static gboolean gimp_color_bar_expose (GtkWidget *widget,
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GdkEventExpose *event);
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G_DEFINE_TYPE (GimpColorBar, gimp_color_bar, GTK_TYPE_MISC)
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#define parent_class gimp_color_bar_parent_class
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static void
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gimp_color_bar_class_init (GimpColorBarClass *klass)
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{
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GObjectClass *object_class;
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GtkWidgetClass *widget_class;
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GimpRGB white = { 1.0, 1.0, 1.0, 1.0 };
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object_class = G_OBJECT_CLASS (klass);
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widget_class = GTK_WIDGET_CLASS (klass);
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object_class->set_property = gimp_color_bar_set_property;
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g_object_class_install_property (object_class, PROP_ORIENTATION,
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g_param_spec_enum ("orientation",
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NULL, NULL,
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GTK_TYPE_ORIENTATION,
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GTK_ORIENTATION_HORIZONTAL,
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GIMP_PARAM_WRITABLE |
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G_PARAM_CONSTRUCT_ONLY));
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g_object_class_install_property (object_class, PROP_COLOR,
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gimp_param_spec_rgb ("color",
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NULL, NULL,
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FALSE, &white,
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GIMP_PARAM_WRITABLE |
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G_PARAM_CONSTRUCT));
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g_object_class_install_property (object_class, PROP_ORIENTATION,
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g_param_spec_enum ("histogram-channel",
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NULL, NULL,
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GIMP_TYPE_HISTOGRAM_CHANNEL,
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GIMP_HISTOGRAM_VALUE,
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GIMP_PARAM_WRITABLE));
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widget_class->expose_event = gimp_color_bar_expose;
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}
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static void
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gimp_color_bar_init (GimpColorBar *bar)
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{
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GTK_WIDGET_SET_FLAGS (bar, GTK_NO_WINDOW);
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bar->orientation = GTK_ORIENTATION_HORIZONTAL;
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}
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static void
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gimp_color_bar_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GimpColorBar *bar = GIMP_COLOR_BAR (object);
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switch (property_id)
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{
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case PROP_ORIENTATION:
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bar->orientation = g_value_get_enum (value);
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break;
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case PROP_COLOR:
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gimp_color_bar_set_color (bar, g_value_get_boxed (value));
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break;
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case PROP_CHANNEL:
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gimp_color_bar_set_channel (bar, g_value_get_enum (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static gboolean
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gimp_color_bar_expose (GtkWidget *widget,
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GdkEventExpose *event)
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{
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GimpColorBar *bar = GIMP_COLOR_BAR (widget);
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guchar *buf;
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guchar *b;
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gint x, y;
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gint width, height;
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gint i, j;
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x = GTK_MISC (bar)->xpad;
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y = GTK_MISC (bar)->ypad;
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width = widget->allocation.width - 2 * x;
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height = widget->allocation.height - 2 * y;
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if (width < 1 || height < 1)
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return TRUE;
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buf = g_alloca (width * height * 3);
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switch (bar->orientation)
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{
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case GTK_ORIENTATION_HORIZONTAL:
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for (i = 0, b = buf; i < width; i++, b += 3)
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{
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guchar *src = bar->buf + 3 * ((i * 256) / width);
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b[0] = src[0];
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b[1] = src[1];
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b[2] = src[2];
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}
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for (i = 1; i < height; i++)
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memcpy (buf + i * width * 3, buf, width * 3);
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break;
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case GTK_ORIENTATION_VERTICAL:
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for (i = 0, b = buf; i < height; i++, b += 3 * width)
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{
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guchar *src = bar->buf + 3 * (255 - ((i * 256) / height));
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guchar *dest = b;
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for (j = 0; j < width; j++, dest += 3)
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{
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dest[0] = src[0];
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dest[1] = src[1];
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dest[2] = src[2];
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}
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}
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break;
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}
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gdk_draw_rgb_image (widget->window, widget->style->black_gc,
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widget->allocation.x + x, widget->allocation.y + y,
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width, height,
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GDK_RGB_DITHER_NORMAL,
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buf, 3 * width);
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return TRUE;
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}
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/**
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* gimp_color_bar_new:
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* @orientation: whether the bar should be oriented horizontally or
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* vertically
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*
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* Creates a new #GimpColorBar widget.
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*
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* Return value: The new #GimpColorBar widget.
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**/
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GtkWidget *
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gimp_color_bar_new (GtkOrientation orientation)
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{
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return g_object_new (GIMP_TYPE_COLOR_BAR,
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"orientation", orientation,
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NULL);
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}
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/**
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* gimp_color_bar_set_color:
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* @bar: a #GimpColorBar widget
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* @color: a #GimpRGB color
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*
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* Makes the @bar display a gradient from black (on the left or the
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* bottom), to the given @color (on the right or at the top).
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**/
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void
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gimp_color_bar_set_color (GimpColorBar *bar,
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const GimpRGB *color)
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{
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guchar *buf;
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gint i;
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g_return_if_fail (GIMP_IS_COLOR_BAR (bar));
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g_return_if_fail (color != NULL);
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for (i = 0, buf = bar->buf; i < 256; i++, buf += 3)
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{
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buf[0] = ROUND (color->r * (gdouble) i);
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buf[1] = ROUND (color->g * (gdouble) i);
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buf[2] = ROUND (color->b * (gdouble) i);
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}
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gtk_widget_queue_draw (GTK_WIDGET (bar));
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}
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/**
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* gimp_color_bar_set_channel:
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* @bar: a #GimpColorBar widget
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* @channel: a #GimpHistogramChannel
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*
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* Convenience function that calls gimp_color_bar_set_color() with the
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* color that matches the @channel.
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**/
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void
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gimp_color_bar_set_channel (GimpColorBar *bar,
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GimpHistogramChannel channel)
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{
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GimpRGB color = { 1.0, 1.0, 1.0, 1.0 };
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g_return_if_fail (GIMP_IS_COLOR_BAR (bar));
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switch (channel)
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{
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case GIMP_HISTOGRAM_VALUE:
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case GIMP_HISTOGRAM_ALPHA:
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case GIMP_HISTOGRAM_RGB:
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gimp_rgb_set (&color, 1.0, 1.0, 1.0);
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break;
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case GIMP_HISTOGRAM_RED:
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gimp_rgb_set (&color, 1.0, 0.0, 0.0);
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break;
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case GIMP_HISTOGRAM_GREEN:
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gimp_rgb_set (&color, 0.0, 1.0, 0.0);
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break;
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case GIMP_HISTOGRAM_BLUE:
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gimp_rgb_set (&color, 0.0, 0.0, 1.0);
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break;
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}
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gimp_color_bar_set_color (bar, &color);
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}
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/**
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* gimp_color_bar_set_buffers:
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* @bar: a #GimpColorBar widget
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* @red: an array of 256 values
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* @green: an array of 256 values
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* @blue: an array of 256 values
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*
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* This function gives full control over the colors displayed by the
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* @bar widget. The 3 arrays can for example be taken from a #Levels
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* or a #Curves struct.
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**/
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void
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gimp_color_bar_set_buffers (GimpColorBar *bar,
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const guchar *red,
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const guchar *green,
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const guchar *blue)
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{
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guchar *buf;
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gint i;
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g_return_if_fail (GIMP_IS_COLOR_BAR (bar));
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g_return_if_fail (red != NULL);
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g_return_if_fail (green != NULL);
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g_return_if_fail (blue != NULL);
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for (i = 0, buf = bar->buf; i < 256; i++, buf += 3)
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{
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buf[0] = red[i];
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buf[1] = green[i];
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buf[2] = blue[i];
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}
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gtk_widget_queue_draw (GTK_WIDGET (bar));
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}
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