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+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.3
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software
+// is granted provided this copyright notice appears in all copies.
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+// mcseemagg@yahoo.com
+// http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Horizontal span interpolator for use with an arbitrary transformer
+// The efficiency highly depends on the operations done in the transformer
+//
+//----------------------------------------------------------------------------
+
+#ifndef AGG_SPAN_INTERPOLATOR_TRANS_INCLUDED
+#define AGG_SPAN_INTERPOLATOR_TRANS_INCLUDED
+
+#include "agg_basics.h"
+
+namespace agg
+{
+ //=================================================span_interpolator_trans
+ template<class Transformer, unsigned SubpixelShift = 8>
+ class span_interpolator_trans
+ {
+ public:
+ typedef Transformer trans_type;
+ enum
+ {
+ subpixel_shift = SubpixelShift,
+ subpixel_size = 1 << subpixel_shift
+ };
+
+ //--------------------------------------------------------------------
+ span_interpolator_trans() {}
+ span_interpolator_trans(const trans_type& trans) : m_trans(&trans) {}
+ span_interpolator_trans(const trans_type& trans,
+ double x, double y, unsigned) :
+ m_trans(&trans)
+ {
+ begin(x, y, 0);
+ }
+
+ //----------------------------------------------------------------
+ const trans_type& transformer() const { return *m_trans; }
+ void transformer(const trans_type& trans) { m_trans = &trans; }
+
+ //----------------------------------------------------------------
+ void begin(double x, double y, unsigned)
+ {
+ m_x = x;
+ m_y = y;
+ m_trans->transform(&x, &y);
+ m_ix = int(x * subpixel_size);
+ m_iy = int(y * subpixel_size);
+ }
+
+ //----------------------------------------------------------------
+ void next(double, double, unsigned)
+ {
+ }
+
+ //----------------------------------------------------------------
+ void operator++()
+ {
+ m_x += 1.0;
+ double x = m_x;
+ double y = m_y;
+ m_trans->transform(&x, &y);
+ m_ix = int(x * subpixel_size);
+ m_iy = int(y * subpixel_size);
+ }
+
+ //----------------------------------------------------------------
+ void coordinates(int* x, int* y) const
+ {
+ *x = m_ix;
+ *y = m_iy;
+ }
+
+ private:
+ const trans_type* m_trans;
+ double m_x;
+ double m_y;
+ int m_ix;
+ int m_iy;
+ };
+
+}
+
+#endif