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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
//----------------------------------------------------------------------------
#ifndef AGG_PIXFMT_AMASK_ADAPTOR_INCLUDED
#define AGG_PIXFMT_AMASK_ADAPTOR_INCLUDED
#include <string.h>
#include "agg_rendering_buffer.h"
namespace agg
{
//==================================================pixfmt_amask_adaptor
template<class PixFmt, class AlphaMask> class pixfmt_amask_adaptor
{
public:
typedef PixFmt pixfmt_type;
typedef typename pixfmt_type::color_type color_type;
typedef AlphaMask amask_type;
typedef typename amask_type::cover_type cover_type;
private:
enum { span_extra_tail = 256 };
void realloc_span(unsigned len)
{
if(len > m_max_len)
{
delete [] m_span;
m_span = new cover_type[m_max_len = len + span_extra_tail];
}
}
void init_span(unsigned len)
{
realloc_span(len);
// ATTN! May work incorrectly if cover_type is more that one byte
memset(m_span, amask_type::cover_full, len * sizeof(cover_type));
}
void init_span(unsigned len, const cover_type* covers)
{
realloc_span(len);
memcpy(m_span, covers, len * sizeof(cover_type));
}
public:
~pixfmt_amask_adaptor() { delete [] m_span; }
pixfmt_amask_adaptor(pixfmt_type& pixf, const amask_type& mask) :
m_pixf(&pixf), m_mask(&mask), m_span(0), m_max_len(0)
{}
void attach_pixfmt(pixfmt_type& pixf) { m_pixf = &pixf; }
void attach_alpha_mask(const amask_type& mask) { m_mask = &mask; }
//--------------------------------------------------------------------
unsigned width() const { return m_pixf->width(); }
unsigned height() const { return m_pixf->height(); }
//--------------------------------------------------------------------
color_type pixel(int x, int y)
{
return m_pixf->pixel(x, y);
}
//--------------------------------------------------------------------
void copy_pixel(int x, int y, const color_type& c)
{
m_pixf->blend_pixel(x, y, c, m_mask->pixel(x, y));
}
//--------------------------------------------------------------------
void blend_pixel(int x, int y, const color_type& c, cover_type cover)
{
m_pixf->blend_pixel(x, y, c, m_mask->combine_pixel(x, y, cover));
}
//--------------------------------------------------------------------
void copy_hline(int x, int y,
unsigned len,
const color_type& c)
{
realloc_span(len);
m_mask->fill_hspan(x, y, m_span, len);
m_pixf->blend_solid_hspan(x, y, len, c, m_span);
}
//--------------------------------------------------------------------
void blend_hline(int x, int y,
unsigned len,
const color_type& c,
cover_type cover)
{
init_span(len);
m_mask->combine_hspan(x, y, m_span, len);
m_pixf->blend_solid_hspan(x, y, len, c, m_span);
}
//--------------------------------------------------------------------
void copy_vline(int x, int y,
unsigned len,
const color_type& c)
{
realloc_span(len);
m_mask->fill_vspan(x, y, m_span, len);
m_pixf->blend_solid_vspan(x, y, len, c, m_span);
}
//--------------------------------------------------------------------
void blend_vline(int x, int y,
unsigned len,
const color_type& c,
cover_type cover)
{
init_span(len);
m_mask->combine_vspan(x, y, m_span, len);
m_pixf->blend_solid_vspan(x, y, len, c, m_span);
}
//--------------------------------------------------------------------
void copy_from(const rendering_buffer& from,
int xdst, int ydst,
int xsrc, int ysrc,
unsigned len)
{
m_pixf->copy_from(from, xdst, ydst, xsrc, ysrc, len);
}
//--------------------------------------------------------------------
void blend_solid_hspan(int x, int y,
unsigned len,
const color_type& c,
const cover_type* covers)
{
init_span(len, covers);
m_mask->combine_hspan(x, y, m_span, len);
m_pixf->blend_solid_hspan(x, y, len, c, m_span);
}
//--------------------------------------------------------------------
void blend_solid_vspan(int x, int y,
unsigned len,
const color_type& c,
const cover_type* covers)
{
init_span(len, covers);
m_mask->combine_vspan(x, y, m_span, len);
m_pixf->blend_solid_vspan(x, y, len, c, m_span);
}
//--------------------------------------------------------------------
void blend_color_hspan(int x, int y,
unsigned len,
const color_type* colors,
const cover_type* covers,
cover_type cover = cover_full)
{
if(covers)
{
init_span(len, covers);
m_mask->combine_hspan(x, y, m_span, len);
}
else
{
realloc_span(len);
m_mask->fill_hspan(x, y, m_span, len);
}
m_pixf->blend_color_hspan(x, y, len, colors, m_span, cover);
}
//--------------------------------------------------------------------
void blend_color_vspan(int x, int y,
unsigned len,
const color_type* colors,
const cover_type* covers,
cover_type cover = cover_full)
{
if(covers)
{
init_span(len, covers);
m_mask->combine_vspan(x, y, m_span, len);
}
else
{
realloc_span(len);
m_mask->fill_vspan(x, y, m_span, len);
}
m_pixf->blend_color_vspan(x, y, len, colors, m_span, cover);
}
//--------------------------------------------------------------------
void blend_opaque_color_hspan(int x, int y,
unsigned len,
const color_type* colors,
const cover_type* covers,
cover_type cover = cover_full)
{
if(covers)
{
init_span(len, covers);
m_mask->combine_hspan(x, y, m_span, len);
}
else
{
realloc_span(len);
m_mask->fill_hspan(x, y, m_span, len);
}
m_pixf->blend_opaque_color_hspan(x, y, len, colors, m_span, cover);
}
//--------------------------------------------------------------------
void blend_opaque_color_vspan(int x, int y,
unsigned len,
const color_type* colors,
const cover_type* covers,
cover_type cover = cover_full)
{
if(covers)
{
init_span(len, covers);
m_mask->combine_vspan(x, y, m_span, len);
}
else
{
realloc_span(len);
m_mask->fill_vspan(x, y, m_span, len);
}
m_pixf->blend_opaque_color_vspan(x, y, len, colors, m_span, cover);
}
private:
pixfmt_type* m_pixf;
const amask_type* m_mask;
cover_type* m_span;
unsigned m_max_len;
};
}
#endif
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