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//----------------------------------------------------------------------------
// AGG Contribution Pack - Gradients 1 (AGG CP - Gradients 1)
// http://milan.marusinec.sk/aggcp
//
// For Anti-Grain Geometry - Version 2.4
// http://www.antigrain.org
//
// Contribution Created By:
// Milan Marusinec alias Milano
// milan@marusinec.sk
// Copyright (c) 2007-2008
//
// 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.
//
// [History] -----------------------------------------------------------------
//
// 03.02.2008-Milano: Ported from Object Pascal code of AggPas
//
#ifndef AGG_SPAN_GRADIENT_IMAGE_INCLUDED
#define AGG_SPAN_GRADIENT_IMAGE_INCLUDED
#include "agg_basics.h"
#include "agg_span_gradient.h"
#include "agg_color_rgba.h"
#include "agg_rendering_buffer.h"
#include "agg_pixfmt_rgba.h"
namespace agg
{
//==========================================================one_color_function
template<class ColorT> class one_color_function
{
public:
typedef ColorT color_type;
color_type m_color;
one_color_function() :
m_color()
{
}
static unsigned size() { return 1; }
const color_type& operator [] (unsigned i) const
{
return m_color;
}
color_type* operator [] (unsigned i)
{
return &m_color;
}
};
//==========================================================gradient_image
template<class ColorT> class gradient_image
{
private:
//------------ fields
typedef ColorT color_type;
typedef agg::pixfmt_rgba32 pixfmt_type;
agg::rgba8* m_buffer;
int m_alocdx;
int m_alocdy;
int m_width;
int m_height;
color_type* m_color;
one_color_function<color_type> m_color_function;
public:
gradient_image() :
m_color_function(),
m_buffer(NULL),
m_alocdx(0),
m_alocdy(0),
m_width(0),
m_height(0)
{
m_color = m_color_function[0 ];
}
~gradient_image()
{
if (m_buffer) { delete [] m_buffer; }
}
void* image_create(int width, int height )
{
void* result = NULL;
if (width > m_alocdx || height > m_alocdy)
{
if (m_buffer) { delete [] m_buffer; }
m_buffer = NULL;
m_buffer = new agg::rgba8[width * height];
if (m_buffer)
{
m_alocdx = width;
m_alocdy = height;
}
else
{
m_alocdx = 0;
m_alocdy = 0;
};
};
if (m_buffer)
{
m_width = width;
m_height = height;
for (int rows = 0; rows < height; rows++)
{
agg::rgba8* row = &m_buffer[rows * m_alocdx ];
memset(row ,0 ,m_width * 4 );
};
result = m_buffer;
};
return result;
}
void* image_buffer() { return m_buffer; }
int image_width() { return m_width; }
int image_height() { return m_height; }
int image_stride() { return m_alocdx * 4; }
int calculate(int x, int y, int d) const
{
if (m_buffer)
{
int px = x >> agg::gradient_subpixel_shift;
int py = y >> agg::gradient_subpixel_shift;
px %= m_width;
if (px < 0)
{
px += m_width;
}
py %= m_height;
if (py < 0 )
{
py += m_height;
}
rgba8* pixel = &m_buffer[py * m_alocdx + px ];
m_color->r = pixel->r;
m_color->g = pixel->g;
m_color->b = pixel->b;
m_color->a = pixel->a;
}
else
{
m_color->r = 0;
m_color->g = 0;
m_color->b = 0;
m_color->a = 0;
}
return 0;
}
const one_color_function<color_type>& color_function() const
{
return m_color_function;
}
};
}
#endif
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