1 files changed, 128 insertions, 0 deletions
diff --git a/vcl/unx/gtk3/gtkcairo.cxx b/vcl/unx/gtk3/gtkcairo.cxx
new file mode 100644
index 000000000..202e3244d
--- /dev/null
+++ b/vcl/unx/gtk3/gtkcairo.cxx
@@ -0,0 +1,128 @@
+/* -*- 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 "gtkcairo.hxx"
+
+#include <vcl/sysdata.hxx>
+#include <vcl/virdev.hxx>
+
+#include <unx/gtk/gtkgdi.hxx>
+
+namespace
+{
+    Size get_surface_size(cairo_surface_t *surface)
+    {
+        cairo_t *cr = cairo_create(surface);
+        double x1, x2, y1, y2;
+        cairo_clip_extents(cr, &x1, &y1, &x2, &y2);
+        cairo_destroy(cr);
+        return Size(x2 - x1, y2 - y1);
+    }
+}
+
+namespace cairo
+{
+    /**
+     * Surface::Surface:     Create generic Canvas surface using given Cairo Surface
+     *
+     * @param pSurface Cairo Surface
+     *
+     * This constructor only stores data, it does no processing.
+     * It is used with e.g. cairo_image_surface_create_for_data()
+     *
+     * Set the mpSurface as pSurface
+     **/
+    Gtk3Surface::Gtk3Surface(const CairoSurfaceSharedPtr& pSurface)
+        : mpGraphics(nullptr)
+        , cr(nullptr)
+        , mpSurface(pSurface)
+    {}
+
+    /**
+     * Surface::Surface:   Create Canvas surface from Window reference.
+     * @param x horizontal location of the new surface
+     * @param y vertical location of the new surface
+     * @param width width of the new surface
+     * @param height height of the new surface
+     *
+     * Set the mpSurface to the new surface or NULL
+     **/
+    Gtk3Surface::Gtk3Surface(const GtkSalGraphics* pGraphics, int x, int y, int width, int height)
+        : mpGraphics(pGraphics)
+        , cr(pGraphics->getCairoContext())
+    {
+        cairo_surface_t* surface = cairo_get_target(cr);
+        mpSurface.reset(
+            cairo_surface_create_for_rectangle(surface, x, y, width, height),
+            &cairo_surface_destroy);
+    }
+
+    Gtk3Surface::~Gtk3Surface()
+    {
+        if (cr)
+            cairo_destroy(cr);
+    }
+
+    /**
+     * Surface::getCairo:  Create Cairo (drawing object) for the Canvas surface
+     *
+     * @return new Cairo or NULL
+     **/
+    CairoSharedPtr Gtk3Surface::getCairo() const
+    {
+        return CairoSharedPtr( cairo_create(mpSurface.get()),
+                               &cairo_destroy );
+    }
+
+    /**
+     * Surface::getSimilar:  Create new similar Canvas surface
+     * @param cairo_content_type format of the new surface (cairo_content_t from cairo/src/cairo.h)
+     * @param width width of the new surface
+     * @param height height of the new surface
+     *
+     * Creates a new Canvas surface. This normally creates platform native surface, even though
+     * generic function is used.
+     *
+     * Cairo surface from cairo_content_type (cairo_content_t)
+     *
+     * @return new surface or NULL
+     **/
+    SurfaceSharedPtr Gtk3Surface::getSimilar(int cairo_content_type, int width, int height ) const
+    {
+        return std::make_shared<Gtk3Surface>(
+                            CairoSurfaceSharedPtr(
+                                cairo_surface_create_similar( mpSurface.get(),
+                                    static_cast<cairo_content_t>(cairo_content_type), width, height ),
+                                &cairo_surface_destroy ));
+    }
+
+    void Gtk3Surface::flush() const
+    {
+        cairo_surface_flush(mpSurface.get());
+        //Wonder if there is any benefit in using cairo_fill/stroke extents on
+        //every canvas call and only redrawing the union of those in a
+        //poor-mans-damage tracking
+        if (mpGraphics)
+            mpGraphics->WidgetQueueDraw();
+    }
+
+    VclPtr<VirtualDevice> Gtk3Surface::createVirtualDevice() const
+    {
+        SystemGraphicsData aSystemGraphicsData;
+
+        aSystemGraphicsData.nSize = sizeof(SystemGraphicsData);
+        aSystemGraphicsData.pSurface = mpSurface.get();
+
+        return VclPtr<VirtualDevice>::Create(aSystemGraphicsData,
+                              get_surface_size(mpSurface.get()),
+                              DeviceFormat::DEFAULT);
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */