cairo-utils.h revision e69a0e74868212310d9036c55d66070190d861b6
/**
* @file
* @brief Cairo integration helpers
*//*
* Authors:
* Krzysztof Kosiński <tweenk.pl@gmail.com>
*
* Copyright (C) 2010 Authors
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#ifndef SEEN_INKSCAPE_DISPLAY_CAIRO_UTILS_H
#define SEEN_INKSCAPE_DISPLAY_CAIRO_UTILS_H
#include <glib.h>
#include <cairomm/cairomm.h>
#include <2geom/forward.h>
namespace Inkscape {
/** @brief RAII idiom for Cairo groups.
* Groups are temporary surfaces used when rendering e.g. masks and opacity.
* Use this class to ensure that each group push is matched with a pop. */
class CairoGroup {
public:
CairoGroup(cairo_t *_ct);
~CairoGroup();
void push();
void push_with_content(cairo_content_t content);
cairo_pattern_t *pop();
Cairo::RefPtr<Cairo::Pattern> popmm();
void pop_to_source();
private:
cairo_t *ct;
bool pushed;
};
/** @brief RAII idiom for Cairo state saving */
class CairoSave {
public:
CairoSave(cairo_t *_ct, bool save=false)
: ct(_ct)
, saved(save)
{
if (save) {
cairo_save(ct);
}
}
void save() {
if (!saved) {
cairo_save(ct);
saved = true;
}
}
~CairoSave() {
if (saved)
cairo_restore(ct);
}
private:
cairo_t *ct;
bool saved;
};
/** @brief Cairo context with Inkscape-specific operations */
class CairoContext : public Cairo::Context {
public:
CairoContext(cairo_t *obj, bool ref = false);
void transform(Geom::Matrix const &m);
void set_source_rgba32(guint32 color);
void append_path(Geom::PathVector const &pv);
static Cairo::RefPtr<CairoContext> create(Cairo::RefPtr<Cairo::Surface> const &target);
};
} // namespace Inkscape
#endif
/*
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:encoding=utf-8:textwidth=99 :