mirror of https://github.com/GNOME/gimp.git
283 lines
7.4 KiB
C
283 lines
7.4 KiB
C
/* LIBGIMP - The GIMP Library
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* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
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*
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* gimpgradientmenu.c
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* Copyright (C) 1998 Andy Thomas
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <string.h>
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#include "gimp.h"
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#include "gimpui.h"
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/* Idea is to have a function to call that returns a widget that
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* completely controls the selection of a gradient.
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* you get a widget returned that you can use in a table say.
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* In:- Initial gradient name. Null means use current selection.
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* pointer to func to call when gradient changes (GimpRunGradientCallback).
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* Returned:- Pointer to a widget that you can use in UI.
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*
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* Widget simply made up of a preview widget (20x40) containing the gradient
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* which can be clicked on to changed the gradient selection.
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*/
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#define GSEL_DATA_KEY "__gsel_data"
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#define CELL_SIZE_HEIGHT 18
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#define CELL_SIZE_WIDTH 84
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struct __gradients_sel
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{
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gchar *dname;
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GimpRunGradientCallback cback;
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GtkWidget *gradient_preview;
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GtkWidget *button;
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gchar *gradient_popup_pnt;
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gint width;
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gchar *gradient_name; /* Local copy */
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gdouble *grad_data; /* local copy */
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gint sample_size;
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gpointer data;
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};
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typedef struct __gradients_sel GSelect;
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static void
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gradient_pre_update (GtkWidget *gradient_preview,
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gint width_data,
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gdouble *grad_data)
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{
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gint x;
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gint y;
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gdouble *src;
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gdouble r, g, b, a;
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gdouble c0, c1;
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guchar *p0;
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guchar *p1;
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guchar *even;
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guchar *odd;
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gint width;
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width = width_data / 4;
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/* Draw the gradient */
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src = grad_data;
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p0 = even = g_malloc (width * 3);
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p1 = odd = g_malloc (width * 3);
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for (x = 0; x < width; x++)
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{
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r = src[x*4+0];
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g = src[x*4+1];
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b = src[x*4+2];
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a = src[x*4+3];
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if ((x / GIMP_CHECK_SIZE_SM) & 1)
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{
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c0 = GIMP_CHECK_LIGHT;
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c1 = GIMP_CHECK_DARK;
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}
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else
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{
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c0 = GIMP_CHECK_DARK;
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c1 = GIMP_CHECK_LIGHT;
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}
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*p0++ = (c0 + (r - c0) * a) * 255.0;
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*p0++ = (c0 + (g - c0) * a) * 255.0;
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*p0++ = (c0 + (b - c0) * a) * 255.0;
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*p1++ = (c1 + (r - c1) * a) * 255.0;
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*p1++ = (c1 + (g - c1) * a) * 255.0;
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*p1++ = (c1 + (b - c1) * a) * 255.0;
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}
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for (y = 0; y < CELL_SIZE_HEIGHT; y++)
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{
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if ((y / GIMP_CHECK_SIZE_SM) & 1)
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gtk_preview_draw_row (GTK_PREVIEW (gradient_preview),
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(guchar *)odd, 0, y,
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(width < CELL_SIZE_WIDTH) ? width : CELL_SIZE_WIDTH);
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else
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gtk_preview_draw_row (GTK_PREVIEW (gradient_preview),
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(guchar *)even, 0, y,
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(width < CELL_SIZE_WIDTH) ? width : CELL_SIZE_WIDTH);
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}
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g_free (even);
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g_free (odd);
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/* Draw the brush preview */
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gtk_widget_draw (gradient_preview, NULL);
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}
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static void
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gradient_select_invoker (gchar *name,
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gint width,
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gdouble *grad_data,
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gint closing,
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gpointer data)
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{
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GSelect *gsel = (GSelect*)data;
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if (gsel->grad_data != NULL)
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g_free (gsel->grad_data);
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gsel->width = width;
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if (gsel->gradient_name)
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g_free (gsel->gradient_name);
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gsel->gradient_name = g_strdup (name);
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/* one row only each row has four doubles r,g,b,a */
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gsel->grad_data = g_new (gdouble, width);
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/* printf("name = %s width = %d\n",name,width);*/
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g_memmove (gsel->grad_data, grad_data, width * sizeof (gdouble));
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gradient_pre_update (gsel->gradient_preview, gsel->width, gsel->grad_data);
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if (gsel->cback != NULL)
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(gsel->cback)(name, width, grad_data, closing, gsel->data);
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if (closing)
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gtk_widget_set_sensitive (gsel->button, TRUE);
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}
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static void
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gradient_preview_callback (GtkWidget *widget,
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gpointer data)
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{
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GSelect *gsel = (GSelect*)data;
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gtk_widget_set_sensitive (gsel->button, FALSE);
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gsel->gradient_popup_pnt =
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gimp_interactive_selection_gradient ((gsel->dname) ? gsel->dname
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: "Gradient Plugin Selection",
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gsel->gradient_name,
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gsel->sample_size,
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gradient_select_invoker,
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gsel);
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}
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GtkWidget *
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gimp_gradient_select_widget (gchar *dname,
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gchar *igradient,
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GimpRunGradientCallback cback,
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gpointer data)
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{
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GtkWidget *button;
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GtkWidget *hbox;
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GtkWidget *gradient;
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gint width;
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gdouble *grad_data;
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gchar *gradient_name;
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GSelect *gsel;
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gsel = g_new (GSelect, 1);
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hbox = gtk_hbox_new (FALSE, 3);
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gtk_widget_show(hbox);
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button = gtk_button_new ();
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gradient = gtk_preview_new (GTK_PREVIEW_COLOR);
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gtk_preview_size (GTK_PREVIEW (gradient), CELL_SIZE_WIDTH, CELL_SIZE_HEIGHT);
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gtk_widget_show (gradient);
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gtk_container_add (GTK_CONTAINER (button), gradient);
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gtk_signal_connect (GTK_OBJECT (button), "clicked",
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(GtkSignalFunc) gradient_preview_callback,
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(gpointer)gsel);
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gtk_widget_show(button);
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gsel->button = button;
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gsel->cback = cback;
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gsel->data = data;
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gsel->grad_data = NULL;
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gsel->gradient_preview = gradient;
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gsel->dname = dname;
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gsel->gradient_popup_pnt = NULL;
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gsel->sample_size = CELL_SIZE_WIDTH;
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/* Do initial gradient setup */
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gradient_name =
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gimp_gradients_get_gradient_data (igradient, &width, CELL_SIZE_WIDTH, &grad_data);
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if (gradient_name)
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{
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gradient_pre_update (gsel->gradient_preview, width, grad_data);
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gsel->grad_data = grad_data;
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gsel->gradient_name = gradient_name;
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gsel->width = width;
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}
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else
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{
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gsel->gradient_name = g_strdup (igradient);
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}
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gtk_box_pack_start (GTK_BOX (hbox), button, TRUE, TRUE, 0);
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gtk_object_set_data (GTK_OBJECT (hbox), GSEL_DATA_KEY, (gpointer)gsel);
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return hbox;
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}
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void
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gimp_gradient_select_widget_close_popup (GtkWidget *widget)
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{
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GSelect *gsel;
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gsel = (GSelect*) gtk_object_get_data (GTK_OBJECT (widget), GSEL_DATA_KEY);
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if (gsel && gsel->gradient_popup_pnt)
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{
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gimp_gradients_close_popup (gsel->gradient_popup_pnt);
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gsel->gradient_popup_pnt = NULL;
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}
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}
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void
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gimp_gradient_select_widget_set_popup (GtkWidget *widget,
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gchar *gname)
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{
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gint width;
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gdouble *grad_data;
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gchar *gradient_name;
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GSelect *gsel;
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gsel = (GSelect*) gtk_object_get_data (GTK_OBJECT (widget), GSEL_DATA_KEY);
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if (gsel)
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{
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gradient_name =
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gimp_gradients_get_gradient_data (gname, &width, gsel->sample_size, &grad_data);
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if (gradient_name)
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{
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gradient_select_invoker (gname, width, grad_data, 0, gsel);
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if (gsel->gradient_popup_pnt)
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gimp_gradients_set_popup (gsel->gradient_popup_pnt, gname);
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}
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}
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}
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