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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 <string.h>
#include "gimp.h"
#include "gimpui.h"
/* Idea is to have a function to call that returns a widget that
* completely controls the selection of a gradient.
* you get a widget returned that you can use in a table say.
* In:- Initial gradient name. Null means use current selection.
* pointer to func to call when gradient changes (GimpRunGradientCallback).
* Returned:- Pointer to a widget that you can use in UI.
*
* Widget simply made up of a preview widget (20x40) containing the gradient
* which can be clicked on to changed the gradient selection.
*/
#define GSEL_DATA_KEY "__gsel_data"
#define CELL_SIZE_HEIGHT 18
#define CELL_SIZE_WIDTH 84
struct __gradients_sel
{
gchar *dname;
GimpRunGradientCallback cback;
GtkWidget *gradient_preview;
GtkWidget *button;
gchar *gradient_popup_pnt;
gint width;
gchar *gradient_name; /* Local copy */
gdouble *grad_data; /* local copy */
gint sample_size;
gpointer data;
};
typedef struct __gradients_sel GSelect;
static void
gradient_pre_update (GtkWidget *gradient_preview,
gint width_data,
gdouble *grad_data)
{
gint x;
gint y;
gdouble *src;
gdouble r, g, b, a;
gdouble c0, c1;
guchar *p0;
guchar *p1;
guchar *even;
guchar *odd;
gint width;
width = width_data / 4;
/* Draw the gradient */
src = grad_data;
p0 = even = g_malloc (width * 3);
p1 = odd = g_malloc (width * 3);
for (x = 0; x < width; x++)
{
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 = 0; y < CELL_SIZE_HEIGHT; y++)
{
if ((y / GIMP_CHECK_SIZE_SM) & 1)
gtk_preview_draw_row (GTK_PREVIEW (gradient_preview),
(guchar *)odd, 0, y,
(width < CELL_SIZE_WIDTH) ? width : CELL_SIZE_WIDTH);
else
gtk_preview_draw_row (GTK_PREVIEW (gradient_preview),
(guchar *)even, 0, y,
(width < CELL_SIZE_WIDTH) ? width : CELL_SIZE_WIDTH);
}
g_free (even);
g_free (odd);
/* Draw the brush preview */
gtk_widget_draw (gradient_preview, NULL);
}
static void
gradient_select_invoker (gchar *name,
gint width,
gdouble *grad_data,
gint closing,
gpointer data)
{
GSelect *gsel = (GSelect*)data;
if (gsel->grad_data != NULL)
g_free (gsel->grad_data);
gsel->width = width;
if (gsel->gradient_name)
g_free (gsel->gradient_name);
gsel->gradient_name = g_strdup (name);
/* one row only each row has four doubles r,g,b,a */
gsel->grad_data = g_new (gdouble, width);
/* printf("name = %s width = %d\n",name,width);*/
g_memmove (gsel->grad_data, grad_data, width * sizeof (gdouble));
gradient_pre_update (gsel->gradient_preview, gsel->width, gsel->grad_data);
if (gsel->cback != NULL)
(gsel->cback)(name, width, grad_data, closing, gsel->data);
if (closing)
gtk_widget_set_sensitive (gsel->button, TRUE);
}
static void
gradient_preview_callback (GtkWidget *widget,
gpointer data)
{
GSelect *gsel = (GSelect*)data;
gtk_widget_set_sensitive (gsel->button, FALSE);
gsel->gradient_popup_pnt =
gimp_interactive_selection_gradient ((gsel->dname) ? gsel->dname
: "Gradient Plugin Selection",
gsel->gradient_name,
gsel->sample_size,
gradient_select_invoker,
gsel);
}
GtkWidget *
gimp_gradient_select_widget (gchar *dname,
gchar *igradient,
GimpRunGradientCallback cback,
gpointer data)
{
GtkWidget *button;
GtkWidget *hbox;
GtkWidget *gradient;
gint width;
gdouble *grad_data;
gchar *gradient_name;
GSelect *gsel;
gsel = g_new (GSelect, 1);
hbox = gtk_hbox_new (FALSE, 3);
gtk_widget_show(hbox);
button = gtk_button_new ();
gradient = gtk_preview_new (GTK_PREVIEW_COLOR);
gtk_preview_size (GTK_PREVIEW (gradient),
CELL_SIZE_WIDTH, CELL_SIZE_HEIGHT);
gtk_widget_show (gradient);
gtk_container_add (GTK_CONTAINER (button), gradient);
g_signal_connect (G_OBJECT (button), "clicked",
G_CALLBACK (gradient_preview_callback),
gsel);
gtk_widget_show(button);
gsel->button = button;
gsel->cback = cback;
gsel->data = data;
gsel->grad_data = NULL;
gsel->gradient_preview = gradient;
gsel->dname = dname;
gsel->gradient_popup_pnt = NULL;
gsel->sample_size = CELL_SIZE_WIDTH;
/* Do initial gradient setup */
gradient_name =
gimp_gradients_get_gradient_data (igradient,
CELL_SIZE_WIDTH, &width,
&grad_data);
if (gradient_name)
{
gradient_pre_update (gsel->gradient_preview, width, grad_data);
gsel->grad_data = grad_data;
gsel->gradient_name = gradient_name;
gsel->width = width;
}
else
{
gsel->gradient_name = g_strdup (igradient);
}
gtk_box_pack_start (GTK_BOX (hbox), button, TRUE, TRUE, 0);
g_object_set_data (G_OBJECT (hbox), GSEL_DATA_KEY, gsel);
return hbox;
}
void
gimp_gradient_select_widget_close_popup (GtkWidget *widget)
{
GSelect *gsel;
gsel = (GSelect*) g_object_get_data (G_OBJECT (widget), GSEL_DATA_KEY);
if (gsel && gsel->gradient_popup_pnt)
{
gimp_gradients_close_popup (gsel->gradient_popup_pnt);
gsel->gradient_popup_pnt = NULL;
}
}
void
gimp_gradient_select_widget_set_popup (GtkWidget *widget,
gchar *gname)
{
gint width;
gdouble *grad_data;
gchar *gradient_name;
GSelect *gsel;
gsel = (GSelect*) g_object_get_data (G_OBJECT (widget), GSEL_DATA_KEY);
if (gsel)
{
gradient_name =
gimp_gradients_get_gradient_data (gname,
gsel->sample_size, &width,
&grad_data);
if (gradient_name)
{
gradient_select_invoker (gname, width, grad_data, 0, gsel);
if (gsel->gradient_popup_pnt)
gimp_gradients_set_popup (gsel->gradient_popup_pnt, gname);
}
}
}
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