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-rw-r--r--src/ui/cache/README3
-rw-r--r--src/ui/cache/svg_preview_cache.cpp173
-rw-r--r--src/ui/cache/svg_preview_cache.h69
3 files changed, 245 insertions, 0 deletions
diff --git a/src/ui/cache/README b/src/ui/cache/README
new file mode 100644
index 0000000..1cdbaee
--- /dev/null
+++ b/src/ui/cache/README
@@ -0,0 +1,3 @@
+This directory is for utility code for maintaining caches of UI things,
+such as symbol previews, thumbnails, font lists, brushes, dashes, etc.
+
diff --git a/src/ui/cache/svg_preview_cache.cpp b/src/ui/cache/svg_preview_cache.cpp
new file mode 100644
index 0000000..10bf3cf
--- /dev/null
+++ b/src/ui/cache/svg_preview_cache.cpp
@@ -0,0 +1,173 @@
+// 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"
+
+cairo_surface_t* render_surface(Inkscape::Drawing &drawing, double scale_factor, Geom::Rect const &dbox,
+ Geom::IntPoint pixsize, double device_scale, const guint32* checkerboard_color, bool no_clip)
+{
+ scale_factor *= device_scale;
+ pixsize.x() *= device_scale;
+ pixsize.y() *= device_scale;
+
+ Geom::IntRect ibox = (dbox * Geom::Scale(scale_factor)).roundOutwards();
+
+ if (no_clip) {
+ // check if object fits in the surface
+ if (ibox.width() > pixsize.x() || ibox.height() > pixsize.y()) {
+ auto sx = static_cast<double>(ibox.width()) / pixsize.x();
+ auto sy = static_cast<double>(ibox.height()) / pixsize.y();
+ // reduce scale
+ scale_factor /= std::max(sx, sy);
+ ibox = (dbox * Geom::Scale(scale_factor)).roundOutwards();
+ }
+ }
+
+ drawing.root()->setTransform(Geom::Scale(scale_factor));
+
+ drawing.update(ibox);
+
+ /* Find visible area */
+ int width = ibox.width();
+ int height = ibox.height();
+ int dx = pixsize.x();
+ int dy = pixsize.y();
+ 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), pixsize);
+
+ /* Render */
+ cairo_surface_t *s = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, pixsize.x(), pixsize.y());
+ Inkscape::DrawingContext dc(s, area.min());
+
+ if (checkerboard_color) {
+ guint rgba = *checkerboard_color;
+ auto pattern = ink_cairo_pattern_create_checkerboard(rgba);
+ dc.save();
+ dc.transform(Geom::Scale(device_scale));
+ dc.setOperator(CAIRO_OPERATOR_SOURCE);
+ dc.setSource(pattern);
+ dc.paint();
+ dc.restore();
+ cairo_pattern_destroy(pattern);
+ }
+
+ drawing.render(dc, area, Inkscape::DrawingItem::RENDER_BYPASS_CACHE);
+ cairo_surface_flush(s);
+
+ return s;
+}
+
+GdkPixbuf* render_pixbuf(Inkscape::Drawing &drawing, double scale_factor, Geom::Rect const &dbox, unsigned psize) {
+ auto s = render_surface(drawing, scale_factor, dbox, Geom::IntPoint(psize, psize), 1, nullptr, true);
+ 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 :
diff --git a/src/ui/cache/svg_preview_cache.h b/src/ui/cache/svg_preview_cache.h
new file mode 100644
index 0000000..9006eb4
--- /dev/null
+++ b/src/ui/cache/svg_preview_cache.h
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * @brief Preview cache
+ */
+/*
+ * Copyright (C) 2007 Bryce W. Harrington <bryce@bryceharrington.org>
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_INKSCAPE_UI_SVG_PREVIEW_CACHE_H
+#define SEEN_INKSCAPE_UI_SVG_PREVIEW_CACHE_H
+
+#include <map>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <glibmm/ustring.h>
+#include <2geom/rect.h>
+#include <2geom/int-point.h>
+
+namespace Inkscape {
+
+class Drawing;
+class DrawingItem;
+
+} // namespace Inkscape
+
+
+cairo_surface_t* render_surface(Inkscape::Drawing &drawing, double scale_factor, const Geom::Rect& dbox,
+ Geom::IntPoint pixsize, double device_scale, const guint32* checkerboard_color, bool no_clip);
+
+GdkPixbuf* render_pixbuf(Inkscape::Drawing &drawing, double scale_factor, const Geom::Rect& dbox, unsigned psize);
+
+namespace Inkscape {
+namespace UI {
+namespace Cache {
+
+class SvgPreview {
+ protected:
+ std::map<Glib::ustring, GdkPixbuf*> _pixmap_cache;
+
+ public:
+ SvgPreview();
+ ~SvgPreview();
+
+ Glib::ustring cache_key(gchar const *uri, gchar const *name, unsigned psize) const;
+ GdkPixbuf* get_preview_from_cache(const Glib::ustring& key);
+ void set_preview_in_cache(const Glib::ustring& key, GdkPixbuf* px);
+ GdkPixbuf* get_preview(const gchar* uri, const gchar* id, Inkscape::DrawingItem *root, double scale_factor, unsigned int psize);
+ void remove_preview_from_cache(const Glib::ustring& key);
+};
+
+}; // namespace Cache
+}; // namespace UI
+}; // namespace Inkscape
+
+
+
+#endif // SEEN_INKSCAPE_UI_SVG_PREVIEW_CACHE_H
+/*
+ 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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