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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 except @item, recursively, skipping groups and defs.
*/
static void hide_other_items_recursively(SPObject *o, SPItem *i, unsigned dkey)
{
SPItem *item = dynamic_cast<SPItem *>(o);
if ( item
&& !dynamic_cast<SPDefs *>(item)
&& !dynamic_cast<SPRoot *>(item)
&& !dynamic_cast<SPGroup *>(item)
&& !dynamic_cast<SPUse *>(item)
&& (i != o) )
{
item->invoke_hide(dkey);
}
// recurse
if (i != o) {
for (auto& child: o->children) {
hide_other_items_recursively(&child, i, dkey);
}
}
}
// The following is a mutation of the flood fill code, the marker preview, and random other samplings.
// The dpi settings don't do anything yet, but I want them to, and was wanting to keep reasonably close
// to the call for the interface to the png writing.
bool sp_export_jpg_file(SPDocument *doc, gchar const *filename,
double x0, double y0, double x1, double y1,
unsigned width, unsigned height, double xdpi, double ydpi,
unsigned long bgcolor, double quality, SPItem* item)
{
std::unique_ptr<Inkscape::Pixbuf> pixbuf(
sp_generate_internal_bitmap(doc, filename, x0, y0, x1, y1,
width, height, xdpi, ydpi, bgcolor, item));
gchar c[32];
g_snprintf(c, 32, "%f", quality);
gboolean saved = gdk_pixbuf_save(pixbuf->getPixbufRaw(), filename, "jpeg", nullptr, "quality", c, NULL);
return saved;
}
/**
generates a bitmap from given items
the bitmap is stored in RAM and not written to file
@param x0 area left in document coordinates
@param y0 area top in document coordinates
@param x1 area right in document coordinates
@param y1 area bottom in document coordinates
@param width bitmap width in pixels
@param height bitmap height in pixels
@param xdpi
@param ydpi
@return the created GdkPixbuf structure or NULL if no memory is allocable
*/
Inkscape::Pixbuf *sp_generate_internal_bitmap(SPDocument *doc, gchar const */*filename*/,
double x0, double y0, double x1, double y1,
unsigned width, unsigned height, double xdpi, double ydpi,
unsigned long /*bgcolor*/,
SPItem *item_only)
{
if (width == 0 || height == 0) return nullptr;
Inkscape::Pixbuf *inkpb = nullptr;
/* Create new drawing for offscreen rendering*/
Inkscape::Drawing drawing;
drawing.setExact(true);
unsigned dkey = SPItem::display_key_new(1);
doc->ensureUpToDate();
Geom::Rect screen=Geom::Rect(Geom::Point(x0,y0), Geom::Point(x1, y1));
Geom::Point origin = screen.min();
Geom::Scale scale(Inkscape::Util::Quantity::convert(xdpi, "px", "in"), Inkscape::Util::Quantity::convert(ydpi, "px", "in"));
Geom::Affine affine = scale * Geom::Translate(-origin * scale);
/* Create ArenaItems and set transform */
Inkscape::DrawingItem *root = doc->getRoot()->invoke_show( drawing, dkey, SP_ITEM_SHOW_DISPLAY);
root->setTransform(affine);
drawing.setRoot(root);
// We show all and then 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 (item_only) {
hide_other_items_recursively(doc->getRoot(), item_only, dkey);
// TODO: The following line forces 100% opacity as required by sp_asbitmap_render() in cairo-renderer.cpp
// Make it conditional if 'item_only' is ever used by other callers which need to retain opacity
item_only->get_arenaitem(dkey)->setOpacity(1.0);
}
Geom::IntRect final_bbox = Geom::IntRect::from_xywh(0, 0, width, height);
drawing.update(final_bbox);
cairo_surface_t *surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
if (cairo_surface_status(surface) == CAIRO_STATUS_SUCCESS) {
Inkscape::DrawingContext dc(surface, Geom::Point(0,0));
// render items
drawing.render(dc, final_bbox, Inkscape::DrawingItem::RENDER_BYPASS_CACHE);
inkpb = 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);
}
doc->getRoot()->invoke_hide(dkey);
// gdk_pixbuf_save (pixbuf, "C:\\temp\\internal.jpg", "jpeg", NULL, "quality","100", NULL);
return inkpb;
}
/*
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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