Implement more unique_ptr allocation wrappers and place in new Wrappers.h header.

1 files changed, 109 insertions, 0 deletions

diff --git a/gtk/Wrappers.h b/gtk/Wrappers.h
new file mode 100644
index 000000000..a22605a03
--- /dev/null
+++ b/gtk/Wrappers.h
@@ -0,0 +1,109 @@
+// Scintilla source code edit control
+// Wrappers.h - Encapsulation of GLib, GObject, Pango, Cairo, GTK, and GDK types
+// Copyright 2022 by Neil Hodgson <neilh@scintilla.org>
+// The License.txt file describes the conditions under which this software may be distributed.
+
+#ifndef WRAPPERS_H
+#define WRAPPERS_H
+
+namespace Scintilla::Internal {
+
+// GLib
+
+struct GFreeReleaser {
+	template <class T>
+	void operator()(T *object) noexcept {
+		g_free(object);
+	}
+};
+
+using UniqueStr = std::unique_ptr<gchar, GFreeReleaser>;
+
+// GObject
+
+struct GObjectReleaser {
+	// Called by unique_ptr to destroy/free the object
+	template <class T>
+	void operator()(T *object) noexcept {
+		g_object_unref(object);
+	}
+};
+
+// Pango
+
+using UniquePangoContext = std::unique_ptr<PangoContext, GObjectReleaser>;
+using UniquePangoLayout = std::unique_ptr<PangoLayout, GObjectReleaser>;
+using UniquePangoFontMap = std::unique_ptr<PangoFontMap, GObjectReleaser>;
+
+struct FontDescriptionReleaser {
+	void operator()(PangoFontDescription *fontDescription) noexcept {
+		pango_font_description_free(fontDescription);
+	}
+};
+
+using UniquePangoFontDescription = std::unique_ptr<PangoFontDescription, FontDescriptionReleaser>;
+
+struct FontMetricsReleaser {
+	void operator()(PangoFontMetrics *metrics) noexcept {
+		pango_font_metrics_unref(metrics);
+	}
+};
+
+using UniquePangoFontMetrics = std::unique_ptr<PangoFontMetrics, FontMetricsReleaser>;
+
+struct LayoutIterReleaser {
+	// Called by unique_ptr to destroy/free the object
+	void operator()(PangoLayoutIter *iter) noexcept {
+		pango_layout_iter_free(iter);
+	}
+};
+
+using UniquePangoLayoutIter = std::unique_ptr<PangoLayoutIter, LayoutIterReleaser>;
+
+// Cairo
+
+struct CairoReleaser {
+	void operator()(cairo_t *context) noexcept {
+		cairo_destroy(context);
+	}
+};
+
+using UniqueCairo = std::unique_ptr<cairo_t, CairoReleaser>;
+
+struct CairoSurfaceReleaser {
+	void operator()(cairo_surface_t *psurf) noexcept {
+		cairo_surface_destroy(psurf);
+	}
+};
+
+using UniqueCairoSurface = std::unique_ptr<cairo_surface_t, CairoSurfaceReleaser>;
+
+// GTK
+
+using UniqueIMContext = std::unique_ptr<GtkIMContext, GObjectReleaser>;
+
+// GDK
+
+struct GdkEventReleaser {
+	void operator()(GdkEvent *ev) noexcept {
+		gdk_event_free(ev);
+	}
+};
+
+using UniqueGdkEvent = std::unique_ptr<GdkEvent, GdkEventReleaser>;
+
+inline void UnRefCursor(GdkCursor *cursor) noexcept {
+#if GTK_CHECK_VERSION(3,0,0)
+	g_object_unref(cursor);
+#else
+	gdk_cursor_unref(cursor);
+#endif
+}
+
+[[nodiscard]] inline GdkWindow *WindowFromWidget(GtkWidget *w) noexcept {
+	return gtk_widget_get_window(w);
+}
+
+}
+
+#endif