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// SPDX-License-Identifier: GPL-2.0-or-later
/**
* @file
* Cairo drawing context with Inkscape extensions.
*//*
* Authors:
* Krzysztof Kosiński <tweenk.pl@gmail.com>
*
* Copyright (C) 2011 Authors
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "display/drawing-context.h"
#include "display/drawing-surface.h"
#include "display/cairo-utils.h"
namespace Inkscape {
using Geom::X;
using Geom::Y;
/**
* @class DrawingContext::Save
* RAII idiom for saving the state of DrawingContext.
*/
DrawingContext::Save::Save()
: _dc(nullptr)
{}
DrawingContext::Save::Save(DrawingContext &dc)
: _dc(&dc)
{
_dc->save();
}
DrawingContext::Save::~Save()
{
if (_dc) {
_dc->restore();
}
}
void DrawingContext::Save::save(DrawingContext &dc)
{
if (_dc) {
// TODO: it might be better to treat this occurrence as a bug
_dc->restore();
}
_dc = &dc;
_dc->save();
}
/**
* @class DrawingContext
* Minimal wrapper over Cairo.
*
* This is a wrapper over cairo_t, extended with operations that work
* with 2Geom geometrical primitives. Some of this is probably duplicated
* in cairo-render-context.cpp, which provides higher level operations
* for drawing entire SPObjects when exporting.
*/
// Uses existing Cairo surface
DrawingContext::DrawingContext(cairo_t *ct, Geom::Point const &origin)
: _ct(ct)
, _surface(new DrawingSurface(cairo_get_group_target(ct), origin))
, _delete_surface(true)
, _restore_context(true)
{
_surface->_has_context = true;
cairo_reference(_ct);
cairo_save(_ct);
cairo_translate(_ct, -origin[Geom::X], -origin[Geom::Y]);
}
// Uses existing Cairo surface
DrawingContext::DrawingContext(cairo_surface_t *surface, Geom::Point const &origin)
: _ct(nullptr)
, _surface(new DrawingSurface(surface, origin))
, _delete_surface(true)
, _restore_context(false)
{
_surface->_has_context = true;
_ct = _surface->createRawContext();
}
DrawingContext::DrawingContext(DrawingSurface &s)
: _ct(s.createRawContext())
, _surface(&s)
, _delete_surface(false)
, _restore_context(false)
{}
DrawingContext::~DrawingContext()
{
if (_restore_context) {
cairo_restore(_ct);
}
cairo_destroy(_ct);
_surface->_has_context = false;
if (_delete_surface) {
delete _surface;
}
}
void DrawingContext::arc(Geom::Point const ¢er, double radius, Geom::AngleInterval const &angle)
{
double from = angle.initialAngle();
double to = angle.finalAngle();
if (to > from) {
cairo_arc(_ct, center[X], center[Y], radius, from, to);
} else {
cairo_arc_negative(_ct, center[X], center[Y], radius, to, from);
}
}
// Applies transform to Cairo surface
void DrawingContext::transform(Geom::Affine const &trans) {
ink_cairo_transform(_ct, trans);
}
void DrawingContext::path(Geom::PathVector const &pv) {
feed_pathvector_to_cairo(_ct, pv);
}
void DrawingContext::paint(double alpha) {
if (alpha == 1.0) cairo_paint(_ct);
else cairo_paint_with_alpha(_ct, alpha);
}
void DrawingContext::setHairline() {
ink_cairo_set_hairline(_ct);
}
void DrawingContext::setSource(guint32 rgba) {
ink_cairo_set_source_rgba32(_ct, rgba);
}
void DrawingContext::setSource(DrawingSurface *s) {
Geom::Point origin = s->origin();
cairo_set_source_surface(_ct, s->raw(), origin[X], origin[Y]);
}
void DrawingContext::setSourceCheckerboard() {
cairo_pattern_t *check = ink_cairo_pattern_create_checkerboard();
cairo_set_source(_ct, check);
cairo_pattern_destroy(check);
}
Geom::Rect DrawingContext::targetLogicalBounds() const
{
Geom::Rect ret(_surface->area());
return ret;
}
} // end 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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