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gimp/libgimp/gimpgradientmenu.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* gimpgradientmenu.c
* Copyright (C) 1998 Andy Thomas
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <string.h>
#include "gimp.h"
#include "gimpui.h"
#include "libgimp-intl.h"
#define GRADIENT_SELECT_DATA_KEY "gimp-grdient-select-data"
#define CELL_HEIGHT 18
#define CELL_WIDTH 84
typedef struct _GradientSelect GradientSelect;
struct _GradientSelect
{
gchar *title;
GimpRunGradientCallback callback;
gpointer data;
GtkWidget *preview;
GtkWidget *button;
gchar *gradient_name; /* Local copy */
gint sample_size;
gboolean reverse;
gint width;
gdouble *gradient_data; /* Local copy */
const gchar *temp_gradient_callback;
};
/* local function prototypes */
static void gimp_gradient_select_widget_callback (const gchar *name,
gint width,
const gdouble *gradient_data,
gint closing,
gpointer data);
static void gimp_gradient_select_widget_clicked (GtkWidget *widget,
GradientSelect *gradient_sel);
static void gimp_gradient_select_widget_destroy (GtkWidget *widget,
GradientSelect *gradient_sel);
static void gimp_gradient_select_preview_size_allocate
(GtkWidget *widget,
GtkAllocation *allocation,
GradientSelect *gradient_sel);
static void gimp_gradient_select_preview_expose (GtkWidget *preview,
GdkEventExpose *event,
GradientSelect *gradient_sel);
/**
* gimp_gradient_select_widget_new:
* @title: Title of the dialog to use or %NULL to use the default title.
* @gradient_name: Initial gradient name or %NULL to use current selection.
* @callback: A function to call when the selected gradient changes.
* @data: A pointer to arbitary data to be used in the call to
* @callback.
*
* Creates a new #GtkWidget that completely controls the selection of
* a gradient. This widget is suitable for placement in a table in a
* plug-in dialog.
*
* Returns: A #GtkWidget that you can use in your UI.
*/
GtkWidget *
gimp_gradient_select_widget_new (const gchar *title,
const gchar *gradient_name,
GimpRunGradientCallback callback,
gpointer data)
{
GradientSelect *gradient_sel;
g_return_val_if_fail (callback != NULL, NULL);
if (! title)
title = _("Gradient Selection");
gradient_sel = g_new0 (GradientSelect, 1);
gradient_sel->title = g_strdup (title);
gradient_sel->callback = callback;
gradient_sel->data = data;
gradient_sel->sample_size = CELL_WIDTH;
gradient_sel->reverse = FALSE;
if (! gradient_name || ! strlen (gradient_name))
gradient_sel->gradient_name = gimp_context_get_gradient ();
else
gradient_sel->gradient_name = g_strdup (gradient_name);
gradient_sel->button = gtk_button_new ();
g_signal_connect (gradient_sel->button, "clicked",
G_CALLBACK (gimp_gradient_select_widget_clicked),
gradient_sel);
g_signal_connect (gradient_sel->button, "destroy",
G_CALLBACK (gimp_gradient_select_widget_destroy),
gradient_sel);
gradient_sel->preview = gtk_drawing_area_new ();
gtk_widget_set_size_request (gradient_sel->preview, CELL_WIDTH, CELL_HEIGHT);
gtk_container_add (GTK_CONTAINER (gradient_sel->button),
gradient_sel->preview);
gtk_widget_show (gradient_sel->preview);
g_signal_connect (gradient_sel->preview, "size_allocate",
G_CALLBACK (gimp_gradient_select_preview_size_allocate),
gradient_sel);
g_signal_connect (gradient_sel->preview, "expose_event",
G_CALLBACK (gimp_gradient_select_preview_expose),
gradient_sel);
g_object_set_data (G_OBJECT (gradient_sel->button),
GRADIENT_SELECT_DATA_KEY, gradient_sel);
return gradient_sel->button;
}
/**
* gimp_gradient_select_widget_close;
* @widget: A gradient select widget.
*
* Closes the popup window associated with @widget.
*/
void
gimp_gradient_select_widget_close (GtkWidget *widget)
{
GradientSelect *gradient_sel;
gradient_sel = g_object_get_data (G_OBJECT (widget),
GRADIENT_SELECT_DATA_KEY);
g_return_if_fail (gradient_sel != NULL);
if (gradient_sel->temp_gradient_callback)
{
gimp_gradient_select_destroy (gradient_sel->temp_gradient_callback);
gradient_sel->temp_gradient_callback = NULL;
}
}
/**
* gimp_gradient_select_widget_set:
* @widget: A gradient select widget.
* @gradient_name: Gradient name to set.
*
* Sets the current gradient for the gradient select widget. Calls
* the callback function if one was supplied in the call to
* gimp_gradient_select_widget_new().
*/
void
gimp_gradient_select_widget_set (GtkWidget *widget,
const gchar *gradient_name)
{
GradientSelect *gradient_sel;
gradient_sel = g_object_get_data (G_OBJECT (widget),
GRADIENT_SELECT_DATA_KEY);
g_return_if_fail (gradient_sel != NULL);
if (gradient_sel->temp_gradient_callback)
{
gimp_gradients_set_popup (gradient_sel->temp_gradient_callback,
gradient_name);
}
else
{
gchar *name;
gint n_samples;
gdouble *samples;
if (! gradient_name || ! strlen (gradient_name))
name = gimp_context_get_gradient ();
else
name = g_strdup (gradient_name);
if (gimp_gradient_get_uniform_samples (name,
gradient_sel->sample_size,
gradient_sel->reverse,
&n_samples,
&samples))
{
gimp_gradient_select_widget_callback (name,
n_samples, samples,
FALSE, gradient_sel);
g_free (samples);
}
g_free (name);
}
}
/* private functions */
static void
gimp_gradient_select_widget_callback (const gchar *name,
gint width,
const gdouble *gradient_data,
gint closing,
gpointer data)
{
GradientSelect *gradient_sel = (GradientSelect *) data;
g_free (gradient_sel->gradient_name);
g_free (gradient_sel->gradient_data);
gradient_sel->gradient_name = g_strdup (name);
gradient_sel->width = width;
gradient_sel->gradient_data = g_memdup (gradient_data,
width * 4 * sizeof (gdouble));
gtk_widget_queue_draw (gradient_sel->preview);
if (gradient_sel->callback)
gradient_sel->callback (name, width, gradient_data, closing, gradient_sel->data);
if (closing)
gradient_sel->temp_gradient_callback = NULL;
}
static void
gimp_gradient_select_widget_clicked (GtkWidget *widget,
GradientSelect *gradient_sel)
{
if (gradient_sel->temp_gradient_callback)
{
/* calling gimp_gradients_set_popup() raises the dialog */
gimp_gradients_set_popup (gradient_sel->temp_gradient_callback,
gradient_sel->gradient_name);
}
else
{
gradient_sel->temp_gradient_callback =
gimp_gradient_select_new (gradient_sel->title,
gradient_sel->gradient_name,
gradient_sel->sample_size,
gimp_gradient_select_widget_callback,
gradient_sel);
}
}
static void
gimp_gradient_select_widget_destroy (GtkWidget *widget,
GradientSelect *gradient_sel)
{
if (gradient_sel->temp_gradient_callback)
{
gimp_gradient_select_destroy (gradient_sel->temp_gradient_callback);
gradient_sel->temp_gradient_callback = NULL;
}
g_free (gradient_sel->title);
g_free (gradient_sel->gradient_name);
g_free (gradient_sel->gradient_data);
g_free (gradient_sel);
}
static void
gimp_gradient_select_preview_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
GradientSelect *gradient_sel)
{
gint n_samples;
gdouble *samples;
if (gimp_gradient_get_uniform_samples (gradient_sel->gradient_name,
allocation->width,
gradient_sel->reverse,
&n_samples,
&samples))
{
gradient_sel->sample_size = allocation->width;
gradient_sel->width = n_samples;
g_free (gradient_sel->gradient_data);
gradient_sel->gradient_data = samples;
}
}
static void
gimp_gradient_select_preview_expose (GtkWidget *widget,
GdkEventExpose *event,
GradientSelect *gradient_sel)
{
const gdouble *src;
guchar *p0;
guchar *p1;
guchar *even;
guchar *odd;
gint x, y;
src = gradient_sel->gradient_data;
if (! src)
return;
p0 = even = g_malloc (gradient_sel->width * 3);
p1 = odd = g_malloc (gradient_sel->width * 3);
for (x = 0; x < gradient_sel->width; x++)
{
gdouble r, g, b, a;
gdouble c0, c1;
r = src[x * 4 + 0];
g = src[x * 4 + 1];
b = src[x * 4 + 2];
a = src[x * 4 + 3];
if ((x / GIMP_CHECK_SIZE_SM) & 1)
{
c0 = GIMP_CHECK_LIGHT;
c1 = GIMP_CHECK_DARK;
}
else
{
c0 = GIMP_CHECK_DARK;
c1 = GIMP_CHECK_LIGHT;
}
*p0++ = (c0 + (r - c0) * a) * 255.0;
*p0++ = (c0 + (g - c0) * a) * 255.0;
*p0++ = (c0 + (b - c0) * a) * 255.0;
*p1++ = (c1 + (r - c1) * a) * 255.0;
*p1++ = (c1 + (g - c1) * a) * 255.0;
*p1++ = (c1 + (b - c1) * a) * 255.0;
}
for (y = event->area.y; y < event->area.y + event->area.height; y++)
{
guchar *buf = ((y / GIMP_CHECK_SIZE_SM) & 1) ? odd : even;
gdk_draw_rgb_image_dithalign (widget->window,
widget->style->fg_gc[widget->state],
event->area.x, y,
event->area.width, 1,
GDK_RGB_DITHER_MAX,
buf + event->area.x * 3,
gradient_sel->width * 3,
- event->area.x, - y);
}
g_free (odd);
g_free (even);
}
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