1 files changed, 100 insertions, 0 deletions
diff --git a/vcl/unx/gtk4/surfacepaintable.cxx b/vcl/unx/gtk4/surfacepaintable.cxx
new file mode 100644
index 000000000..2e8aa98b2
--- /dev/null
+++ b/vcl/unx/gtk4/surfacepaintable.cxx
@@ -0,0 +1,100 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "surfacepaintable.hxx"
+
+struct _SurfacePaintable
+{
+    GObject parent_instance;
+    int width;
+    int height;
+    cairo_surface_t* surface;
+};
+
+namespace
+{
+struct _SurfacePaintableClass : public GObjectClass
+{
+};
+}
+
+static void surface_paintable_snapshot(GdkPaintable* paintable, GdkSnapshot* snapshot, double width,
+                                       double height)
+{
+    graphene_rect_t rect
+        = GRAPHENE_RECT_INIT(0.0f, 0.0f, static_cast<float>(width), static_cast<float>(height));
+    SurfacePaintable* self = SURFACE_PAINTABLE(paintable);
+    cairo_t* cr = gtk_snapshot_append_cairo(GTK_SNAPSHOT(snapshot), &rect);
+    cairo_set_source_surface(cr, self->surface, 0, 0);
+    cairo_paint(cr);
+    cairo_destroy(cr);
+}
+
+static GdkPaintableFlags surface_paintable_get_flags(GdkPaintable* /*paintable*/)
+{
+    return static_cast<GdkPaintableFlags>(GDK_PAINTABLE_STATIC_SIZE
+                                          | GDK_PAINTABLE_STATIC_CONTENTS);
+}
+
+static int surface_paintable_get_intrinsic_width(GdkPaintable* paintable)
+{
+    SurfacePaintable* self = SURFACE_PAINTABLE(paintable);
+    return self->width;
+}
+
+static int surface_paintable_get_intrinsic_height(GdkPaintable* paintable)
+{
+    SurfacePaintable* self = SURFACE_PAINTABLE(paintable);
+    return self->height;
+}
+
+static void surface_paintable_init_interface(GdkPaintableInterface* iface)
+{
+    iface->snapshot = surface_paintable_snapshot;
+    iface->get_flags = surface_paintable_get_flags;
+    iface->get_intrinsic_width = surface_paintable_get_intrinsic_width;
+    iface->get_intrinsic_height = surface_paintable_get_intrinsic_height;
+}
+
+G_DEFINE_TYPE_WITH_CODE(SurfacePaintable, surface_paintable, G_TYPE_OBJECT,
+                        G_IMPLEMENT_INTERFACE(GDK_TYPE_PAINTABLE,
+                                              surface_paintable_init_interface));
+
+static void surface_paintable_init(SurfacePaintable* self)
+{
+    self->width = 0;
+    self->height = 0;
+    self->surface = nullptr;
+
+    // prevent loplugin:unreffun firing on macro generated function
+    (void)surface_paintable_get_instance_private(self);
+}
+
+static void surface_paintable_dispose(GObject* object)
+{
+    SurfacePaintable* self = SURFACE_PAINTABLE(object);
+    cairo_surface_destroy(self->surface);
+    G_OBJECT_CLASS(surface_paintable_parent_class)->dispose(object);
+}
+
+static void surface_paintable_class_init(SurfacePaintableClass* klass)
+{
+    GObjectClass* object_class = G_OBJECT_CLASS(klass);
+    object_class->dispose = surface_paintable_dispose;
+}
+
+void surface_paintable_set_source(SurfacePaintable* pPaintable, cairo_surface_t* pSource,
+                                  int nWidth, int nHeight)
+{
+    pPaintable->surface = pSource;
+    pPaintable->width = nWidth;
+    pPaintable->height = nHeight;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */