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Diffstat (limited to 'agg/inc/agg_span_interpolator_trans.h')
-rwxr-xr-x | agg/inc/agg_span_interpolator_trans.h | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/agg/inc/agg_span_interpolator_trans.h b/agg/inc/agg_span_interpolator_trans.h new file mode 100755 index 000000000000..5caaffe9e5c0 --- /dev/null +++ b/agg/inc/agg_span_interpolator_trans.h @@ -0,0 +1,97 @@ +//---------------------------------------------------------------------------- +// 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 |