Implement clipping (slightly incorrect) and masking

(bzr r9508.1.4)

1 files changed, 88 insertions, 0 deletions

diff --git a/src/display/cairo-utils.h b/src/display/cairo-utils.h
new file mode 100644
index 000000000..feed987bd
--- /dev/null
+++ b/src/display/cairo-utils.h
@@ -0,0 +1,88 @@
+/**
+ * @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 :