diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:24:48 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:24:48 +0000 |
commit | cca66b9ec4e494c1d919bff0f71a820d8afab1fa (patch) | |
tree | 146f39ded1c938019e1ed42d30923c2ac9e86789 /src/ui/cache/svg_preview_cache.cpp | |
parent | Initial commit. (diff) | |
download | inkscape-cca66b9ec4e494c1d919bff0f71a820d8afab1fa.tar.xz inkscape-cca66b9ec4e494c1d919bff0f71a820d8afab1fa.zip |
Adding upstream version 1.2.2.upstream/1.2.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/ui/cache/svg_preview_cache.cpp | 173 |
1 files changed, 173 insertions, 0 deletions
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 : |