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// SPDX-License-Identifier: GPL-2.0-or-later
/** \file
* SVGPreview: Preview cache
*/
/*
* Authors:
* Lauris Kaplinski <lauris@kaplinski.com>
* Bryce Harrington <brycehar@bryceharrington.org>
* bulia byak <buliabyak@users.sf.net>
*
* Copyright (C) 2001-2005 authors
* Copyright (C) 2001 Ximian, Inc.
* Copyright (C) 2004 John Cliff
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*
*/
#include <gtk/gtk.h>
#include <2geom/transforms.h>
#include "selection.h"
#include "inkscape.h"
#include "display/cairo-utils.h"
#include "display/drawing-context.h"
#include "display/drawing-item.h"
#include "display/drawing.h"
#include "ui/cache/svg_preview_cache.h"
GdkPixbuf* render_pixbuf(Inkscape::Drawing &drawing, double scale_factor, Geom::Rect const &dbox, unsigned psize)
{
drawing.root()->setTransform(Geom::Scale(scale_factor));
Geom::IntRect ibox = (dbox * Geom::Scale(scale_factor)).roundOutwards();
drawing.update(ibox);
/* Find visible area */
int width = ibox.width();
int height = ibox.height();
int dx = psize;
int dy = psize;
dx = (dx - width)/2; // watch out for size, since 'unsigned'-'signed' can cause problems if the result is negative
dy = (dy - height)/2;
Geom::IntRect area = Geom::IntRect::from_xywh(
ibox.min() - Geom::IntPoint(dx, dy), Geom::IntPoint(psize, psize));
/* Render */
cairo_surface_t *s = cairo_image_surface_create(
CAIRO_FORMAT_ARGB32, psize, psize);
Inkscape::DrawingContext dc(s, area.min());
drawing.render(dc, area, Inkscape::DrawingItem::RENDER_BYPASS_CACHE);
cairo_surface_flush(s);
GdkPixbuf* pixbuf = ink_pixbuf_create_from_cairo_surface(s);
return pixbuf;
}
namespace Inkscape {
namespace UI {
namespace Cache {
SvgPreview::SvgPreview()
= default;
SvgPreview::~SvgPreview()
{
for (auto & i : _pixmap_cache)
{
g_object_unref(i.second);
i.second = NULL;
}
}
Glib::ustring SvgPreview::cache_key(gchar const *uri, gchar const *name, unsigned psize) const {
Glib::ustring key;
key += (uri!=nullptr) ? uri : "";
key += ":";
key += (name!=nullptr) ? name : "unknown";
key += ":";
key += psize;
return key;
}
GdkPixbuf* SvgPreview::get_preview_from_cache(const Glib::ustring& key) {
std::map<Glib::ustring, GdkPixbuf *>::iterator found = _pixmap_cache.find(key);
if ( found != _pixmap_cache.end() ) {
return found->second;
}
return nullptr;
}
void SvgPreview::set_preview_in_cache(const Glib::ustring& key, GdkPixbuf* px) {
g_object_ref(px);
_pixmap_cache[key] = px;
}
GdkPixbuf* SvgPreview::get_preview(const gchar* uri, const gchar* id, Inkscape::DrawingItem */*root*/,
double /*scale_factor*/, unsigned int psize) {
// First try looking up the cached preview in the cache map
Glib::ustring key = cache_key(uri, id, psize);
GdkPixbuf* px = get_preview_from_cache(key);
if (px == nullptr) {
/*
px = render_pixbuf(root, scale_factor, dbox, psize);
set_preview_in_cache(key, px);
*/
}
return px;
}
void SvgPreview::remove_preview_from_cache(const Glib::ustring& key) {
std::map<Glib::ustring, GdkPixbuf *>::iterator found = _pixmap_cache.find(key);
if ( found != _pixmap_cache.end() ) {
g_object_unref(found->second);
found->second = NULL;
_pixmap_cache.erase(key);
}
}
}
}
}
/*
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:textwidth=99 :
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