--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Viewport/CairoSurface.cpp	Fri Oct 14 15:34:11 2016 +0200
@@ -0,0 +1,139 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * In addition, as a special exception, the copyright holders of this
+ * program give permission to link the code of its release with the
+ * OpenSSL project's "OpenSSL" library (or with modified versions of it
+ * that use the same license as the "OpenSSL" library), and distribute
+ * the linked executables. You must obey the GNU General Public License
+ * in all respects for all of the code used other than "OpenSSL". If you
+ * modify file(s) with this exception, you may extend this exception to
+ * your version of the file(s), but you are not obligated to do so. If
+ * you do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source files
+ * in the program, then also delete it here.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#include "CairoSurface.h"
+
+#include "../Orthanc/Core/Logging.h"
+#include "../Orthanc/Core/OrthancException.h"
+#include "../Orthanc/Core/Images/ImageProcessing.h"
+
+namespace OrthancStone
+{
+  void CairoSurface::Release()
+  {
+    if (surface_)
+    {
+      cairo_surface_destroy(surface_);
+      surface_ = NULL;
+    }
+  }
+
+
+  void CairoSurface::Allocate(unsigned int width,
+                              unsigned int height)
+  {
+    Release();
+
+    surface_ = cairo_image_surface_create(CAIRO_FORMAT_RGB24, width, height);
+    if (!surface_)
+    {
+      // Should never occur
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
+    }
+
+    if (cairo_surface_status(surface_) != CAIRO_STATUS_SUCCESS)
+    {
+      LOG(ERROR) << "Cannot create a Cairo surface";
+      cairo_surface_destroy(surface_);
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
+    }
+
+    width_ = width;
+    height_ = height;
+    pitch_ = cairo_image_surface_get_stride(surface_);
+    buffer_ = cairo_image_surface_get_data(surface_);
+  }
+
+
+  CairoSurface::CairoSurface(Orthanc::ImageAccessor& accessor)
+  {
+    if (accessor.GetFormat() != Orthanc::PixelFormat_BGRA32)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_IncompatibleImageFormat);
+    }      
+
+    width_ = accessor.GetWidth();
+    height_ = accessor.GetHeight();
+    pitch_ = accessor.GetPitch();
+    buffer_ = accessor.GetBuffer();
+
+    surface_ = cairo_image_surface_create_for_data
+      (reinterpret_cast<unsigned char*>(buffer_), CAIRO_FORMAT_RGB24, width_, height_, pitch_);
+    if (!surface_)
+    {
+      // Should never occur
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
+    }
+
+    if (cairo_surface_status(surface_) != CAIRO_STATUS_SUCCESS)
+    {
+      LOG(ERROR) << "Bad pitch for a Cairo surface";
+      cairo_surface_destroy(surface_);
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
+    }
+  }
+
+
+  void CairoSurface::SetSize(unsigned int width,
+                             unsigned int height)
+  {
+    if (width_ != width ||
+        height_ != height)
+    {
+      Allocate(width, height);
+    }
+  }
+
+
+  void CairoSurface::Copy(const CairoSurface& other)
+  {
+    Orthanc::ImageAccessor source = other.GetConstAccessor();
+    Orthanc::ImageAccessor target = GetAccessor();
+    Orthanc::ImageProcessing::Copy(target, source);
+  }
+
+
+  Orthanc::ImageAccessor CairoSurface::GetConstAccessor() const
+  {
+    Orthanc::ImageAccessor accessor;
+    accessor.AssignReadOnly(Orthanc::PixelFormat_BGRA32, width_, height_, pitch_, buffer_);
+    return accessor;
+  }
+
+
+  Orthanc::ImageAccessor CairoSurface::GetAccessor()
+  {
+    Orthanc::ImageAccessor accessor;
+    accessor.AssignWritable(Orthanc::PixelFormat_BGRA32, width_, height_, pitch_, buffer_);
+    return accessor;
+  }
+}