mirror of https://github.com/GNOME/gimp.git
271 lines
7.3 KiB
C
271 lines
7.3 KiB
C
/* LIBGIMP - The GIMP Library
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* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
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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 Library 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 Library 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 <stdio.h>
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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 (GRunGradientCallback).
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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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#define GRAD_CHECK_SIZE_SM 4
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#define GRAD_CHECK_DARK (1.0 / 3.0)
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#define GRAD_CHECK_LIGHT (2.0 / 3.0)
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struct __gradients_sel {
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gchar * dname;
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GRunGradientCallback cback;
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GtkWidget *gradient_preview;
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GtkWidget *button;
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GtkWidget *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 udata;
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};
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typedef struct __gradients_sel GSelect, * GSelectP;
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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,y;
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gdouble *src;
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double r, g, b, a;
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double c0, c1;
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guchar *p0, *p1,*even,*odd;
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gint 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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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 / GRAD_CHECK_SIZE_SM) & 1) {
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c0 = GRAD_CHECK_LIGHT;
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c1 = GRAD_CHECK_DARK;
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} else {
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c0 = GRAD_CHECK_DARK;
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c1 = GRAD_CHECK_LIGHT;
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} /* else */
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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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} /* for */
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for (y = 0; y < CELL_SIZE_HEIGHT; y++)
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{
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if ((y / GRAD_CHECK_SIZE_SM) & 1)
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{
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gtk_preview_draw_row (GTK_PREVIEW (gradient_preview), (guchar *)odd, 0, y, (width < CELL_SIZE_WIDTH)?width:CELL_SIZE_WIDTH);
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}
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else
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{
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gtk_preview_draw_row (GTK_PREVIEW (gradient_preview), (guchar *)even, 0, y, (width < CELL_SIZE_WIDTH)?width:CELL_SIZE_WIDTH);
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}
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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 udata)
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{
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GSelectP gsel = (GSelectP)udata;
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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_malloc(width*sizeof(gdouble));
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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->udata);
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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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GSelectP gsel = (GSelectP)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:"Gradient Plugin Selection",
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gsel->gradient_name,
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gsel->sample_size,
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gradient_select_invoker,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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GRunGradientCallback cback,
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gpointer udata)
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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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GSelectP gsel = g_new(GSelect, sizeof(GSelect));
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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->udata = udata;
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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 = gimp_gradient_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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gint
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gimp_gradient_select_widget_close_popup(GtkWidget *w)
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{
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gint ret_val = FALSE;
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GSelectP gsel = (GSelectP)gtk_object_get_data(GTK_OBJECT(w),GSEL_DATA_KEY);
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if(gsel && gsel->gradient_popup_pnt)
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{
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ret_val = gimp_gradient_close_popup(gsel->gradient_popup_pnt);
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gsel->gradient_popup_pnt = NULL;
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}
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return ret_val;
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}
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gint
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gimp_gradient_select_widget_set_popup(GtkWidget *w,gchar *gname)
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{
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gint ret_val = FALSE;
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gint width;
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gdouble *grad_data;
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gchar *gradient_name;
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GSelectP gsel = (GSelectP)gtk_object_get_data(GTK_OBJECT(w),GSEL_DATA_KEY);
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if(gsel)
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{
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gradient_name = gimp_gradient_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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{
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if(gimp_gradient_set_popup(gsel->gradient_popup_pnt,gname))
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{
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ret_val = TRUE;
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}
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}
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}
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}
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return ret_val;
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}
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