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// SPDX-License-Identifier: GPL-2.0-or-later
/* Authors:
* Anshudhar Kumar Singh <anshudhar2001@gmail.com>
*
* Copyright (C) 2021 Authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "export-preview.h"
#include "document.h"
#include "display/cairo-utils.h"
#include "object/sp-item.h"
#include "object/sp-root.h"
#include "util/preview.h"
#include "io/resource.h"
namespace Inkscape {
namespace UI {
namespace Dialog {
/**
* A preview drawing object is responsible for constructing a drawing and showing it's contents
*
* On destruction it will gracefully invoke hide itself. You should destroy this object when
* you need to change the document object being used for the preview.
*/
PreviewDrawing::PreviewDrawing(SPDocument *doc)
{
_document = doc;
}
PreviewDrawing::~PreviewDrawing()
{
destruct();
_document = nullptr;
}
void PreviewDrawing::destruct()
{
if (!_visionkey)
return;
// On exiting the document root might have gone already.
if (auto root = _document->getRoot()) {
root->invoke_hide(_visionkey);
}
_drawing.reset();
_visionkey = 0;
}
/**
* Construct the drawing, when needed
*/
void PreviewDrawing::construct()
{
auto drawing = std::make_shared<Inkscape::Drawing>();
_visionkey = SPItem::display_key_new(1);
if (auto di = _document->getRoot()->invoke_show(*drawing, _visionkey, SP_ITEM_SHOW_DISPLAY)) {
drawing->setRoot(di);
} else {
drawing.reset();
}
if (!_shown_items.empty()) {
_document->getRoot()->invoke_hide_except(_visionkey, _shown_items);
}
_drawing = drawing;
}
/**
* Render the drawing into a cairo image surface.
*/
bool PreviewDrawing::render(ExportPreview *widget, uint32_t bg, SPItem *item, unsigned size, Geom::OptRect const &dbox)
{
if (!_drawing || _to_destruct) {
if (!_construct_idle.connected()) {
_construct_idle = Glib::signal_timeout().connect([=]() {
_to_destruct = false;
destruct();
construct();
return false;
}, 100);
}
return false;
}
Geom::OptRect bbox = dbox;
DrawingItem *di = nullptr;
if (item) {
bbox = item->documentVisualBounds();
di = item->get_arenaitem(_visionkey);
} else if (!dbox)
bbox = _document->getRoot()->documentVisualBounds();
if (!bbox)
return true; // Force quit
// Use a callback to set the preview rendering;
widget->setPreview(UI::Preview::render_preview(_document, _drawing, bg, di, size, size, *bbox));
return true;
}
/**
* Limit the preview to just these items.
*
* You must call refresh after this for the change to take effect.
*/
void PreviewDrawing::set_shown_items(std::vector<SPItem*> &&list)
{
_shown_items = std::move(list);
_to_destruct = true;
}
void ExportPreview::resetPixels(bool new_size)
{
clear();
// An icon to use when the preview hasn't loaded yet
static Glib::RefPtr<Gdk::Pixbuf> preview_loading;
if (!preview_loading || new_size) {
using namespace Inkscape::IO::Resource;
preview_loading = Gdk::Pixbuf::create_from_file(get_filename(PIXMAPS, "preview_loading.svg"), size, size);
}
if (preview_loading) {
set(preview_loading);
}
show();
}
void ExportPreview::setSize(int newSize)
{
size = newSize;
resetPixels(true);
}
ExportPreview::~ExportPreview()
{
refresh_conn.disconnect();
}
void ExportPreview::setItem(SPItem *item)
{
_item = item;
_dbox = {};
}
void ExportPreview::setBox(Geom::Rect const &bbox)
{
if (bbox.hasZeroArea())
return;
_item = nullptr;
_dbox = bbox;
}
void ExportPreview::setDrawing(std::shared_ptr<PreviewDrawing> drawing)
{
_drawing = drawing;
}
/*
* This is the main function which finally renders the preview.
* If dbox is given it will use it.
* if item is given and not dbox then item is used.
* If both are not given then we simply do nothing.
*/
void ExportPreview::queueRefresh()
{
if (!_drawing || _render_idle.connected())
return;
_render_idle = Glib::signal_timeout().connect([=]() {
return !_drawing->render(this, _bg_color, _item, size, _dbox);
}, 100);
}
/**
* Callback when the rendering is complete.
*/
void ExportPreview::setPreview(Cairo::RefPtr<Cairo::ImageSurface> surface)
{
if (surface) {
set(Gdk::Pixbuf::create(surface, 0, 0, surface->get_width(), surface->get_height()));
show();
}
}
void ExportPreview::setBackgroundColor(uint32_t bg_color)
{
_bg_color = bg_color;
}
} // namespace Dialog
} // namespace UI
} // namespace Inkscape
/*
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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