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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"
namespace Inkscape {
namespace UI {
namespace Widget {
GradientImage::GradientImage(SPGradient *gradient)
: _gradient(nullptr)
{
set_has_window(false);
set_gradient(gradient);
}
GradientImage::~GradientImage()
{
if (_gradient) {
_release_connection.disconnect();
_modified_connection.disconnect();
_gradient = nullptr;
}
}
void
GradientImage::size_request(GtkRequisition *requisition) const
{
requisition->width = 54;
requisition->height = 12;
}
void
GradientImage::get_preferred_width_vfunc(int &minimal_width, int &natural_width) const
{
GtkRequisition requisition;
size_request(&requisition);
minimal_width = natural_width = requisition.width;
}
void
GradientImage::get_preferred_height_vfunc(int &minimal_height, int &natural_height) const
{
GtkRequisition requisition;
size_request(&requisition);
minimal_height = natural_height = requisition.height;
}
bool
GradientImage::on_draw(const Cairo::RefPtr<Cairo::Context> &cr)
{
auto allocation = get_allocation();
cairo_pattern_t *check = ink_cairo_pattern_create_checkerboard();
auto ct = cr->cobj();
cairo_set_source(ct, check);
cairo_paint(ct);
cairo_pattern_destroy(check);
if (_gradient) {
auto p = _gradient->create_preview_pattern(allocation.get_width());
cairo_set_source(ct, p);
cairo_paint(ct);
cairo_pattern_destroy(p);
}
return true;
}
void
GradientImage::set_gradient(SPGradient *gradient)
{
if (_gradient) {
_release_connection.disconnect();
_modified_connection.disconnect();
}
_gradient = gradient;
if (gradient) {
_release_connection = gradient->connectRelease(sigc::mem_fun(*this, &GradientImage::gradient_release));
_modified_connection = gradient->connectModified(sigc::mem_fun(*this, &GradientImage::gradient_modified));
}
update();
}
void
GradientImage::gradient_release(SPObject *)
{
if (_gradient) {
_release_connection.disconnect();
_modified_connection.disconnect();
}
_gradient = nullptr;
update();
}
void
GradientImage::gradient_modified(SPObject *, guint /*flags*/)
{
update();
}
void
GradientImage::update()
{
if (get_is_drawable()) {
queue_draw();
}
}
} // namespace Widget
} // namespace UI
} // namespace Inkscape
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;
}
/*
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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