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// SPDX-License-Identifier: GPL-2.0-or-later
/**
* A simple gradient preview
*
* Author:
* Lauris Kaplinski <lauris@kaplinski.com>
*
* Copyright (C) 2001-2002 Lauris Kaplinski
* Copyright (C) 2001 Ximian, Inc.
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <sigc++/sigc++.h>
#include <glibmm/refptr.h>
#include <gdkmm/pixbuf.h>
#include <cairomm/surface.h>
#include "gradient-image.h"
#include "display/cairo-utils.h"
#include "object/sp-gradient.h"
#include "object/sp-stop.h"
static void sp_gradient_image_size_request (GtkWidget *widget, GtkRequisition *requisition);
static void sp_gradient_image_destroy(GtkWidget *object);
static void sp_gradient_image_get_preferred_width(GtkWidget *widget,
gint *minimal_width,
gint *natural_width);
static void sp_gradient_image_get_preferred_height(GtkWidget *widget,
gint *minimal_height,
gint *natural_height);
static gboolean sp_gradient_image_draw(GtkWidget *widget, cairo_t *cr);
static void sp_gradient_image_gradient_release (SPObject *, SPGradientImage *im);
static void sp_gradient_image_gradient_modified (SPObject *, guint flags, SPGradientImage *im);
static void sp_gradient_image_update (SPGradientImage *img);
G_DEFINE_TYPE(SPGradientImage, sp_gradient_image, GTK_TYPE_WIDGET);
static void sp_gradient_image_class_init(SPGradientImageClass *klass)
{
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
widget_class->get_preferred_width = sp_gradient_image_get_preferred_width;
widget_class->get_preferred_height = sp_gradient_image_get_preferred_height;
widget_class->draw = sp_gradient_image_draw;
widget_class->destroy = sp_gradient_image_destroy;
}
static void
sp_gradient_image_init (SPGradientImage *image)
{
gtk_widget_set_has_window (GTK_WIDGET(image), FALSE);
image->gradient = nullptr;
new (&image->release_connection) sigc::connection();
new (&image->modified_connection) sigc::connection();
}
static void sp_gradient_image_destroy(GtkWidget *object)
{
SPGradientImage *image = SP_GRADIENT_IMAGE (object);
if (image->gradient) {
image->release_connection.disconnect();
image->modified_connection.disconnect();
image->gradient = nullptr;
}
image->release_connection.~connection();
image->modified_connection.~connection();
if (GTK_WIDGET_CLASS(sp_gradient_image_parent_class)->destroy)
GTK_WIDGET_CLASS(sp_gradient_image_parent_class)->destroy(object);
}
static void sp_gradient_image_size_request(GtkWidget * /*widget*/, GtkRequisition *requisition)
{
requisition->width = 54;
requisition->height = 12;
}
static void sp_gradient_image_get_preferred_width(GtkWidget *widget, gint *minimal_width, gint *natural_width)
{
GtkRequisition requisition;
sp_gradient_image_size_request(widget, &requisition);
*minimal_width = *natural_width = requisition.width;
}
static void sp_gradient_image_get_preferred_height(GtkWidget *widget, gint *minimal_height, gint *natural_height)
{
GtkRequisition requisition;
sp_gradient_image_size_request(widget, &requisition);
*minimal_height = *natural_height = requisition.height;
}
static gboolean sp_gradient_image_draw(GtkWidget *widget, cairo_t *ct)
{
SPGradientImage *image = SP_GRADIENT_IMAGE(widget);
SPGradient *gr = image->gradient;
GtkAllocation allocation;
gtk_widget_get_allocation(widget, &allocation);
cairo_pattern_t *check = ink_cairo_pattern_create_checkerboard();
cairo_set_source(ct, check);
cairo_paint(ct);
cairo_pattern_destroy(check);
if (gr) {
cairo_pattern_t *p = gr->create_preview_pattern(allocation.width);
cairo_set_source(ct, p);
cairo_paint(ct);
cairo_pattern_destroy(p);
}
return TRUE;
}
GtkWidget *
sp_gradient_image_new (SPGradient *gradient)
{
SPGradientImage *image = SP_GRADIENT_IMAGE(g_object_new(SP_TYPE_GRADIENT_IMAGE, nullptr));
sp_gradient_image_set_gradient (image, gradient);
return GTK_WIDGET(image);
}
GdkPixbuf*
sp_gradient_to_pixbuf (SPGradient *gr, int width, int height)
{
cairo_surface_t *s = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
cairo_t *ct = cairo_create(s);
cairo_pattern_t *check = ink_cairo_pattern_create_checkerboard();
cairo_set_source(ct, check);
cairo_paint(ct);
cairo_pattern_destroy(check);
if (gr) {
cairo_pattern_t *p = gr->create_preview_pattern(width);
cairo_set_source(ct, p);
cairo_paint(ct);
cairo_pattern_destroy(p);
}
cairo_destroy(ct);
cairo_surface_flush(s);
// no need to free s - the call below takes ownership
GdkPixbuf *pixbuf = ink_pixbuf_create_from_cairo_surface(s);
return pixbuf;
}
Glib::RefPtr<Gdk::Pixbuf>
sp_gradient_to_pixbuf_ref (SPGradient *gr, int width, int height)
{
cairo_surface_t *s = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
cairo_t *ct = cairo_create(s);
cairo_pattern_t *check = ink_cairo_pattern_create_checkerboard();
cairo_set_source(ct, check);
cairo_paint(ct);
cairo_pattern_destroy(check);
if (gr) {
cairo_pattern_t *p = gr->create_preview_pattern(width);
cairo_set_source(ct, p);
cairo_paint(ct);
cairo_pattern_destroy(p);
}
cairo_destroy(ct);
cairo_surface_flush(s);
Cairo::RefPtr<Cairo::Surface> sref = Cairo::RefPtr<Cairo::Surface>(new Cairo::Surface(s));
Glib::RefPtr<Gdk::Pixbuf> pixbuf =
Gdk::Pixbuf::create(sref, 0, 0, width, height);
cairo_surface_destroy(s);
return pixbuf;
}
Glib::RefPtr<Gdk::Pixbuf>
sp_gradstop_to_pixbuf_ref (SPStop *stop, int width, int height)
{
cairo_surface_t *s = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
cairo_t *ct = cairo_create(s);
/* Checkerboard background */
cairo_pattern_t *check = ink_cairo_pattern_create_checkerboard();
cairo_rectangle(ct, 0, 0, width, height);
cairo_set_source(ct, check);
cairo_fill_preserve(ct);
cairo_pattern_destroy(check);
if (stop) {
/* Alpha area */
cairo_rectangle(ct, 0, 0, width/2, height);
ink_cairo_set_source_rgba32(ct, stop->get_rgba32());
cairo_fill(ct);
/* Solid area */
cairo_rectangle(ct, width/2, 0, width, height);
ink_cairo_set_source_rgba32(ct, stop->get_rgba32() | 0xff);
cairo_fill(ct);
}
cairo_destroy(ct);
cairo_surface_flush(s);
Cairo::RefPtr<Cairo::Surface> sref = Cairo::RefPtr<Cairo::Surface>(new Cairo::Surface(s));
Glib::RefPtr<Gdk::Pixbuf> pixbuf =
Gdk::Pixbuf::create(sref, 0, 0, width, height);
cairo_surface_destroy(s);
return pixbuf;
}
void
sp_gradient_image_set_gradient (SPGradientImage *image, SPGradient *gradient)
{
if (image->gradient) {
image->release_connection.disconnect();
image->modified_connection.disconnect();
}
image->gradient = gradient;
if (gradient) {
image->release_connection = gradient->connectRelease(sigc::bind<1>(sigc::ptr_fun(&sp_gradient_image_gradient_release), image));
image->modified_connection = gradient->connectModified(sigc::bind<2>(sigc::ptr_fun(&sp_gradient_image_gradient_modified), image));
}
sp_gradient_image_update (image);
}
static void
sp_gradient_image_gradient_release (SPObject *, SPGradientImage *image)
{
if (image->gradient) {
image->release_connection.disconnect();
image->modified_connection.disconnect();
}
image->gradient = nullptr;
sp_gradient_image_update (image);
}
static void
sp_gradient_image_gradient_modified (SPObject *, guint /*flags*/, SPGradientImage *image)
{
sp_gradient_image_update (image);
}
static void
sp_gradient_image_update (SPGradientImage *image)
{
if (gtk_widget_is_drawable (GTK_WIDGET(image))) {
gtk_widget_queue_draw (GTK_WIDGET (image));
}
}
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8 :
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