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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Helpers for SPItem -> gdk_pixbuf related stuff
*
* Authors:
* John Cliff <simarilius@yahoo.com>
* Jon A. Cruz <jon@joncruz.org>
* Abhishek Sharma
*
* Copyright (C) 2008 John Cliff
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <2geom/transforms.h>
#include "helper/png-write.h"
#include "display/cairo-utils.h"
#include "display/drawing.h"
#include "display/drawing-context.h"
#include "document.h"
#include "object/sp-root.h"
#include "object/sp-defs.h"
#include "object/sp-use.h"
#include "util/units.h"
#include "inkscape.h"
#include "helper/pixbuf-ops.h"
#include <gdk/gdk.h>
// TODO look for copy-n-paste duplication of this function:
/**
* Hide all items that are not in list, recursively, skipping groups and defs.
*/
static void hide_other_items_recursively(SPObject *object, const std::vector<SPItem*> &items, unsigned dkey)
{
SPItem *item = dynamic_cast<SPItem *>(object);
if (!item) {
// <defs>, <metadata>, etc.
return;
}
if (std::find (items.begin(), items.end(), item) != items.end()) {
// It's in our list, don't hide!
return;
}
if ( !dynamic_cast<SPRoot *>(item) &&
!dynamic_cast<SPGroup *>(item) &&
!dynamic_cast<SPUse *>(item) ) {
// Hide if not container or def.
item->invoke_hide(dkey);
}
for (auto& child: object->children) {
hide_other_items_recursively(&child, items, dkey);
}
}
/**
generates a bitmap from given items
the bitmap is stored in RAM and not written to file
@param document Inkscape document.
@param area Export area in document units.
@param dpi Resolution.
@param items Vector of pointers to SPItems to export. Export all items if empty.
@param opaque Set items opacity to 1 (used by Cairo renderer for filtered objects rendered as bitmaps).
@return The created GdkPixbuf structure or nullptr if rendering failed.
*/
Inkscape::Pixbuf *sp_generate_internal_bitmap(SPDocument *document,
Geom::Rect const &area,
double dpi,
std::vector<SPItem *> items,
bool opaque)
{
// Geometry
if (area.hasZeroArea()) {
return nullptr;
}
Geom::Point origin = area.min();
double scale_factor = Inkscape::Util::Quantity::convert(dpi, "px", "in");
Geom::Affine affine = Geom::Translate(-origin) * Geom::Scale (scale_factor, scale_factor);
int width = std::ceil(scale_factor * area.width());
int height = std::ceil(scale_factor * area.height());
// Document
document->ensureUpToDate();
unsigned dkey = SPItem::display_key_new(1);
// Drawing
Inkscape::Drawing drawing; // New drawing for offscreen rendering.
drawing.setExact(true); // Maximum quality for blurs.
/* Create ArenaItems and set transform */
Inkscape::DrawingItem *root = document->getRoot()->invoke_show( drawing, dkey, SP_ITEM_SHOW_DISPLAY);
root->setTransform(affine);
drawing.setRoot(root);
// Hide all items we don't want, instead of showing only requested items,
// because that would not work if the shown item references something in defs.
if (!items.empty()) {
hide_other_items_recursively(document->getRoot(), items, dkey);
}
Geom::IntRect final_area = Geom::IntRect::from_xywh(0, 0, width, height);
drawing.update(final_area);
if (opaque) {
// Required by sp_asbitmap_render().
for (auto item : items) {
if (item->get_arenaitem(dkey)) {
item->get_arenaitem(dkey)->setOpacity(1.0);
}
}
}
// Rendering
cairo_surface_t *surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
Inkscape::Pixbuf* pixbuf = nullptr;
if (cairo_surface_status(surface) == CAIRO_STATUS_SUCCESS) {
Inkscape::DrawingContext dc(surface, Geom::Point(0,0));
// render items
drawing.render(dc, final_area, Inkscape::DrawingItem::RENDER_BYPASS_CACHE);
pixbuf = new Inkscape::Pixbuf(surface);
} else {
long long size =
(long long) height *
(long long) cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, width);
g_warning("sp_generate_internal_bitmap: not enough memory to create pixel buffer. Need %lld.", size);
cairo_surface_destroy(surface);
}
// Return to previous state.
document->getRoot()->invoke_hide(dkey);
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:textwidth=99 :
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