585 lines
18 KiB
C
585 lines
18 KiB
C
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//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.4
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// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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//----------------------------------------------------------------------------
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://www.antigrain.com
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//----------------------------------------------------------------------------
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//
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// Adaptation for high precision colors has been sponsored by
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// Liberty Technology Systems, Inc., visit http://lib-sys.com
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//
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// Liberty Technology Systems, Inc. is the provider of
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// PostScript and PDF technology for software developers.
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//
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//----------------------------------------------------------------------------
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#ifndef AGG_PIXFMT_GRAY_INCLUDED
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#define AGG_PIXFMT_GRAY_INCLUDED
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#include <string.h>
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#include "agg_basics.h"
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#include "agg_color_gray.h"
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#include "agg_rendering_buffer.h"
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namespace agg
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{
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//============================================================blender_gray
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template<class ColorT> struct blender_gray
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{
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typedef ColorT color_type;
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typedef typename color_type::value_type value_type;
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typedef typename color_type::calc_type calc_type;
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enum base_scale_e { base_shift = color_type::base_shift };
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static AGG_INLINE void blend_pix(value_type* p, unsigned cv,
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unsigned alpha, unsigned cover=0)
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{
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*p = (value_type)((((cv - calc_type(*p)) * alpha) + (calc_type(*p) << base_shift)) >> base_shift);
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}
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};
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//======================================================blender_gray_pre
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template<class ColorT> struct blender_gray_pre
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{
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typedef ColorT color_type;
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typedef typename color_type::value_type value_type;
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typedef typename color_type::calc_type calc_type;
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enum base_scale_e { base_shift = color_type::base_shift };
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static AGG_INLINE void blend_pix(value_type* p, unsigned cv,
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unsigned alpha, unsigned cover)
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{
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alpha = color_type::base_mask - alpha;
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cover = (cover + 1) << (base_shift - 8);
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*p = (value_type)((*p * alpha + cv * cover) >> base_shift);
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}
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static AGG_INLINE void blend_pix(value_type* p, unsigned cv,
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unsigned alpha)
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{
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*p = (value_type)(((*p * (color_type::base_mask - alpha)) >> base_shift) + cv);
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}
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};
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//=====================================================apply_gamma_dir_gray
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template<class ColorT, class GammaLut> class apply_gamma_dir_gray
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{
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public:
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typedef typename ColorT::value_type value_type;
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apply_gamma_dir_gray(const GammaLut& gamma) : m_gamma(gamma) {}
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AGG_INLINE void operator () (value_type* p)
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{
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*p = m_gamma.dir(*p);
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}
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private:
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const GammaLut& m_gamma;
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};
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//=====================================================apply_gamma_inv_gray
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template<class ColorT, class GammaLut> class apply_gamma_inv_gray
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{
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public:
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typedef typename ColorT::value_type value_type;
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apply_gamma_inv_gray(const GammaLut& gamma) : m_gamma(gamma) {}
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AGG_INLINE void operator () (value_type* p)
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{
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*p = m_gamma.inv(*p);
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}
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private:
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const GammaLut& m_gamma;
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};
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//=================================================pixfmt_alpha_blend_gray
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template<class Blender, class RenBuf, unsigned Step=1, unsigned Offset=0>
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class pixfmt_alpha_blend_gray
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{
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public:
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typedef RenBuf rbuf_type;
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typedef typename rbuf_type::row_data row_data;
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typedef Blender blender_type;
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typedef typename blender_type::color_type color_type;
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typedef int order_type; // A fake one
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typedef typename color_type::value_type value_type;
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typedef typename color_type::calc_type calc_type;
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enum base_scale_e
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{
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base_shift = color_type::base_shift,
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base_scale = color_type::base_scale,
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base_mask = color_type::base_mask,
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pix_width = sizeof(value_type)
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};
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private:
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//--------------------------------------------------------------------
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static AGG_INLINE void copy_or_blend_pix(value_type* p,
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const color_type& c,
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unsigned cover)
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{
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if (c.a)
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{
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calc_type alpha = (calc_type(c.a) * (cover + 1)) >> 8;
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if(alpha == base_mask)
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{
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*p = c.v;
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}
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else
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{
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Blender::blend_pix(p, c.v, alpha, cover);
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}
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}
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}
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static AGG_INLINE void copy_or_blend_pix(value_type* p,
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const color_type& c)
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{
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if (c.a)
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{
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if(c.a == base_mask)
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{
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*p = c.v;
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}
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else
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{
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Blender::blend_pix(p, c.v, c.a);
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}
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}
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}
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public:
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//--------------------------------------------------------------------
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pixfmt_alpha_blend_gray(rbuf_type& rb) :
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m_rbuf(&rb)
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{}
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//--------------------------------------------------------------------
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AGG_INLINE unsigned width() const { return m_rbuf->width(); }
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AGG_INLINE unsigned height() const { return m_rbuf->height(); }
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//--------------------------------------------------------------------
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const int8u* row_ptr(int y) const
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{
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return m_rbuf->row_ptr(y);
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}
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//--------------------------------------------------------------------
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const int8u* pix_ptr(int x, int y) const
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{
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return m_rbuf->row_ptr(y) + x * pix_width;
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}
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//--------------------------------------------------------------------
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row_data row(int x, int y) const
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{
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return m_rbuf->row(y);
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}
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//--------------------------------------------------------------------
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AGG_INLINE static void make_pix(int8u* p, const color_type& c)
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{
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*(value_type*)p = c.v;
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}
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//--------------------------------------------------------------------
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AGG_INLINE color_type pixel(int x, int y) const
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{
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value_type* p = (value_type*)m_rbuf->row(y) + x * Step + Offset;
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return color_type(*p);
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}
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//--------------------------------------------------------------------
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AGG_INLINE void copy_pixel(int x, int y, const color_type& c)
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{
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*((value_type*)m_rbuf->row_ptr(x, y, 1) + x * Step + Offset) = c.v;
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}
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//--------------------------------------------------------------------
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AGG_INLINE void blend_pixel(int x, int y, const color_type& c, int8u cover)
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{
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copy_or_blend_pix((value_type*)
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m_rbuf->row_ptr(x, y, 1) + x * Step + Offset,
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c,
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cover);
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}
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//--------------------------------------------------------------------
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AGG_INLINE void copy_hline(int x, int y,
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unsigned len,
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const color_type& c)
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{
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value_type* p = (value_type*)
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m_rbuf->row_ptr(x, y, len) + x * Step + Offset;
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do
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{
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*p = c.v;
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p += Step;
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}
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while(--len);
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}
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//--------------------------------------------------------------------
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AGG_INLINE void copy_vline(int x, int y,
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unsigned len,
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const color_type& c)
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{
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do
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{
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value_type* p = (value_type*)
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m_rbuf->row_ptr(x, y++, 1) + x * Step + Offset;
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*p = c.v;
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}
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while(--len);
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}
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//--------------------------------------------------------------------
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void blend_hline(int x, int y,
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unsigned len,
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const color_type& c,
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int8u cover)
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{
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if (c.a)
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{
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value_type* p = (value_type*)
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m_rbuf->row_ptr(x, y, len) + x * Step + Offset;
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calc_type alpha = (calc_type(c.a) * (cover + 1)) >> 8;
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if(alpha == base_mask)
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{
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do
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{
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*p = c.v;
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p += Step;
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}
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while(--len);
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}
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else
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{
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do
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{
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Blender::blend_pix(p, c.v, alpha, cover);
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p += Step;
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}
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while(--len);
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}
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}
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}
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//--------------------------------------------------------------------
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void blend_vline(int x, int y,
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unsigned len,
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const color_type& c,
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int8u cover)
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{
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if (c.a)
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{
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value_type* p;
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calc_type alpha = (calc_type(c.a) * (cover + 1)) >> 8;
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if(alpha == base_mask)
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{
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do
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{
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p = (value_type*)
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m_rbuf->row_ptr(x, y++, 1) + x * Step + Offset;
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*p = c.v;
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}
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while(--len);
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}
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else
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{
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do
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{
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p = (value_type*)
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m_rbuf->row_ptr(x, y++, 1) + x * Step + Offset;
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Blender::blend_pix(p, c.v, alpha, cover);
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}
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while(--len);
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}
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}
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}
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//--------------------------------------------------------------------
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void blend_solid_hspan(int x, int y,
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unsigned len,
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const color_type& c,
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const int8u* covers)
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{
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if (c.a)
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{
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value_type* p = (value_type*)
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m_rbuf->row_ptr(x, y, len) + x * Step + Offset;
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do
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{
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calc_type alpha = (calc_type(c.a) * (calc_type(*covers) + 1)) >> 8;
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if(alpha == base_mask)
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{
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*p = c.v;
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}
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else
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{
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Blender::blend_pix(p, c.v, alpha, *covers);
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}
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p += Step;
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++covers;
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}
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while(--len);
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}
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}
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//--------------------------------------------------------------------
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void blend_solid_vspan(int x, int y,
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unsigned len,
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const color_type& c,
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const int8u* covers)
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{
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if (c.a)
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{
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do
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{
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calc_type alpha = (calc_type(c.a) * (calc_type(*covers) + 1)) >> 8;
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value_type* p = (value_type*)
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m_rbuf->row_ptr(x, y++, 1) + x * Step + Offset;
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if(alpha == base_mask)
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{
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*p = c.v;
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}
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else
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{
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Blender::blend_pix(p, c.v, alpha, *covers);
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}
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++covers;
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}
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while(--len);
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}
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}
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//--------------------------------------------------------------------
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void copy_color_hspan(int x, int y,
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unsigned len,
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const color_type* colors)
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{
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value_type* p = (value_type*)
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m_rbuf->row_ptr(x, y, len) + x * Step + Offset;
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do
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{
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*p++ = colors->v;
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++colors;
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}
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while(--len);
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}
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//--------------------------------------------------------------------
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void blend_color_hspan(int x, int y,
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unsigned len,
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const color_type* colors,
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const int8u* covers,
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int8u cover)
|
||
|
|
{
|
||
|
|
value_type* p = (value_type*)
|
||
|
|
m_rbuf->row_ptr(x, y, len) + x * Step + Offset;
|
||
|
|
|
||
|
|
if(covers)
|
||
|
|
{
|
||
|
|
do
|
||
|
|
{
|
||
|
|
copy_or_blend_pix(p, *colors++, *covers++);
|
||
|
|
p += Step;
|
||
|
|
}
|
||
|
|
while(--len);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if(cover == 255)
|
||
|
|
{
|
||
|
|
do
|
||
|
|
{
|
||
|
|
if(colors->a == base_mask)
|
||
|
|
{
|
||
|
|
*p = colors->v;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
copy_or_blend_pix(p, *colors);
|
||
|
|
}
|
||
|
|
p += Step;
|
||
|
|
++colors;
|
||
|
|
}
|
||
|
|
while(--len);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
do
|
||
|
|
{
|
||
|
|
copy_or_blend_pix(p, *colors++, cover);
|
||
|
|
p += Step;
|
||
|
|
}
|
||
|
|
while(--len);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
//--------------------------------------------------------------------
|
||
|
|
void blend_color_vspan(int x, int y,
|
||
|
|
unsigned len,
|
||
|
|
const color_type* colors,
|
||
|
|
const int8u* covers,
|
||
|
|
int8u cover)
|
||
|
|
{
|
||
|
|
value_type* p;
|
||
|
|
if(covers)
|
||
|
|
{
|
||
|
|
do
|
||
|
|
{
|
||
|
|
p = (value_type*)
|
||
|
|
m_rbuf->row_ptr(x, y++, 1) + x * Step + Offset;
|
||
|
|
|
||
|
|
copy_or_blend_pix(p, *colors++, *covers++);
|
||
|
|
}
|
||
|
|
while(--len);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if(cover == 255)
|
||
|
|
{
|
||
|
|
do
|
||
|
|
{
|
||
|
|
p = (value_type*)
|
||
|
|
m_rbuf->row_ptr(x, y++, 1) + x * Step + Offset;
|
||
|
|
|
||
|
|
if(colors->a == base_mask)
|
||
|
|
{
|
||
|
|
*p = colors->v;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
copy_or_blend_pix(p, *colors);
|
||
|
|
}
|
||
|
|
++colors;
|
||
|
|
}
|
||
|
|
while(--len);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
do
|
||
|
|
{
|
||
|
|
p = (value_type*)
|
||
|
|
m_rbuf->row_ptr(x, y++, 1) + x * Step + Offset;
|
||
|
|
|
||
|
|
copy_or_blend_pix(p, *colors++, cover);
|
||
|
|
}
|
||
|
|
while(--len);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//--------------------------------------------------------------------
|
||
|
|
template<class Function> void for_each_pixel(Function f)
|
||
|
|
{
|
||
|
|
unsigned y;
|
||
|
|
for(y = 0; y < height(); ++y)
|
||
|
|
{
|
||
|
|
row_data r = m_rbuf->row(y);
|
||
|
|
if(r.ptr)
|
||
|
|
{
|
||
|
|
unsigned len = r.x2 - r.x1 + 1;
|
||
|
|
|
||
|
|
value_type* p = (value_type*)
|
||
|
|
m_rbuf->row_ptr(r.x1, y, len) + r.x1 * Step + Offset;
|
||
|
|
|
||
|
|
do
|
||
|
|
{
|
||
|
|
f(p);
|
||
|
|
p += Step;
|
||
|
|
}
|
||
|
|
while(--len);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//--------------------------------------------------------------------
|
||
|
|
template<class GammaLut> void apply_gamma_dir(const GammaLut& g)
|
||
|
|
{
|
||
|
|
for_each_pixel(apply_gamma_dir_gray<color_type, GammaLut>(g));
|
||
|
|
}
|
||
|
|
|
||
|
|
//--------------------------------------------------------------------
|
||
|
|
template<class GammaLut> void apply_gamma_inv(const GammaLut& g)
|
||
|
|
{
|
||
|
|
for_each_pixel(apply_gamma_inv_gray<color_type, GammaLut>(g));
|
||
|
|
}
|
||
|
|
|
||
|
|
//--------------------------------------------------------------------
|
||
|
|
template<class RenBuf2>
|
||
|
|
void copy_from(const RenBuf2& from,
|
||
|
|
int xdst, int ydst,
|
||
|
|
int xsrc, int ysrc,
|
||
|
|
unsigned len)
|
||
|
|
{
|
||
|
|
const int8u* p = from.row_ptr(ysrc);
|
||
|
|
if(p)
|
||
|
|
{
|
||
|
|
memmove(m_rbuf->row_ptr(xdst, ydst, len) + xdst * pix_width,
|
||
|
|
p + xsrc * pix_width,
|
||
|
|
len * pix_width);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
rbuf_type* m_rbuf;
|
||
|
|
};
|
||
|
|
|
||
|
|
typedef blender_gray<gray8> blender_gray8;
|
||
|
|
typedef blender_gray_pre<gray8> blender_gray8_pre;
|
||
|
|
typedef blender_gray<gray16> blender_gray16;
|
||
|
|
typedef blender_gray_pre<gray16> blender_gray16_pre;
|
||
|
|
|
||
|
|
typedef pixfmt_alpha_blend_gray<blender_gray8, rendering_buffer> pixfmt_gray8; //----pixfmt_gray8
|
||
|
|
typedef pixfmt_alpha_blend_gray<blender_gray8_pre, rendering_buffer> pixfmt_gray8_pre; //----pixfmt_gray8_pre
|
||
|
|
typedef pixfmt_alpha_blend_gray<blender_gray16, rendering_buffer> pixfmt_gray16; //----pixfmt_gray16
|
||
|
|
typedef pixfmt_alpha_blend_gray<blender_gray16_pre, rendering_buffer> pixfmt_gray16_pre; //----pixfmt_gray16_pre
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|