1 files changed, 85 insertions, 0 deletions
diff --git a/common/rfb/ScaledPixelBuffer.h b/common/rfb/ScaledPixelBuffer.h
new file mode 100644
index 00000000..3b6aa7ef
--- /dev/null
+++ b/common/rfb/ScaledPixelBuffer.h
@@ -0,0 +1,85 @@
+/* Copyright (C) 2005 TightVNC Team.  All Rights Reserved.
+ *    
+ * This 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 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software 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 software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+// -=- ScaledPixelBuffer.h
+//
+// The ScaledPixelBuffer class allows to scale the image data 
+// from the source buffer to destination buffer using bilinear 
+// interpolation.
+
+#include <rdr/types.h>
+#include <rfb/Rect.h>
+
+using namespace rdr;
+
+namespace rfb {
+
+  class ScaledPixelBuffer {
+  public:
+    ScaledPixelBuffer(U8 **data, int width, int height, int scale);
+    ScaledPixelBuffer();
+    virtual ~ScaledPixelBuffer();
+
+    // Get width, height, number of pixels and scale
+    int width()  const { return scaled_width; }
+    int height() const { return scaled_height; }
+    int area() const { return scaled_width * scaled_height; }
+    int getScale() const { return scale; }
+
+    // Get rectangle encompassing this buffer
+    //   Top-left of rectangle is either at (0,0), or the specified point.
+    Rect getRect() const { return Rect(0, 0, scaled_width, scaled_height); }
+    Rect getRect(const Point& pos) const {
+      return Rect(pos, pos.translate(Point(scaled_width, scaled_height)));
+    }
+
+    // Set the new source buffer and its parameters
+    void setSourceBuffer(U8 **src_data, int w, int h);
+
+    // Set the new scale, in percent
+    virtual void setScale(int scale);
+
+    // Scale rect from the source image buffer to the destination buffer
+    // using bilinear interpolation
+    virtual void scaleRect(const Rect& r);
+
+    // Calculate the scaled image rectangle which depend on the source 
+    // image rectangle.
+    inline Rect calculateScaleBoundary(const Rect& r);
+
+  protected:
+
+    // Calculate the scaled buffer size depending on the source buffer
+    // parameters (width, height, pixel format)
+    void calculateScaledBufferSize();
+
+    // Recreate the scaled pixel buffer
+    virtual void recreateScaledBuffer();
+
+    int src_width;
+    int src_height;
+    int scaled_width;
+    int scaled_height;
+    int bpp;
+    int scale;
+    double scale_ratio;
+    U8 **src_data;
+    U8 *scaled_data;
+  };
+
+};