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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
//----------------------------------------------------------------------------
//
// Adaptation for high precision colors has been sponsored by
// Liberty Technology Systems, Inc., visit http://lib-sys.com
//
// Liberty Technology Systems, Inc. is the provider of
// PostScript and PDF technology for software developers.
//
//----------------------------------------------------------------------------
#ifndef AGG_PIXFMT_GRAY_INCLUDED
#define AGG_PIXFMT_GRAY_INCLUDED
#include "agg_basics.h"
#include "agg_color_gray.h"
#include "agg_rendering_buffer.h"
namespace agg
{
template<class ColorT> struct blender_gray {
typedef ColorT color_type;
typedef typename color_type::value_type value_type;
typedef typename color_type::calc_type calc_type;
enum base_scale_e { base_shift = color_type::base_shift };
static AGG_INLINE void blend_pix(value_type* p, unsigned cv,
unsigned alpha, unsigned cover = 0)
{
*p = (value_type)((((cv - calc_type(*p)) * alpha) + (calc_type(*p) << base_shift)) >> base_shift);
}
};
template<class Blender, unsigned Step = 1, unsigned Offset = 0>
class pixel_formats_gray
{
public:
typedef rendering_buffer::row_data row_data;
typedef rendering_buffer::span_data span_data;
typedef typename Blender::color_type color_type;
typedef typename color_type::value_type value_type;
typedef typename color_type::calc_type calc_type;
enum base_scale_e {
base_shift = color_type::base_shift,
base_size = color_type::base_size,
base_mask = color_type::base_mask
};
private:
static AGG_INLINE void copy_or_blend_pix(value_type* p,
const color_type& c,
unsigned cover)
{
if (c.a) {
calc_type alpha = (calc_type(c.a) * (cover + 1)) >> 8;
if(alpha == base_mask) {
*p = c.v;
} else {
Blender::blend_pix(p, c.v, alpha, cover);
}
}
}
static AGG_INLINE void copy_or_blend_pix(value_type* p,
const color_type& c)
{
if (c.a) {
if(c.a == base_mask) {
*p = c.v;
} else {
Blender::blend_pix(p, c.v, c.a);
}
}
}
public:
pixel_formats_gray(rendering_buffer& rb) :
m_rbuf(&rb)
{}
AGG_INLINE unsigned width() const
{
return m_rbuf->width();
}
AGG_INLINE unsigned height() const
{
return m_rbuf->height();
}
AGG_INLINE color_type pixel(int x, int y) const
{
value_type* p = (value_type*)m_rbuf->row(y) + x * Step + Offset;
return color_type(*p);
}
row_data row(int x, int y) const
{
return row_data(x,
width() - 1,
m_rbuf->row(y) +
x * Step * sizeof(value_type) +
Offset * sizeof(value_type));
}
span_data span(int x, int y, unsigned len)
{
return span_data(x, len,
m_rbuf->row(y) +
x * Step * sizeof(value_type) +
Offset * sizeof(value_type));
}
AGG_INLINE void copy_pixel(int x, int y, const color_type& c)
{
*((value_type*)m_rbuf->row(y) + x * Step + Offset) = c.v;
}
AGG_INLINE void blend_pixel(int x, int y, const color_type& c, int8u cover)
{
copy_or_blend_pix((value_type*)m_rbuf->row(y) + x * Step + Offset, c, cover);
}
AGG_INLINE void copy_hline(int x, int y,
unsigned len,
const color_type& c)
{
value_type* p = (value_type*)m_rbuf->row(y) + x * Step + Offset;
do {
*p = c.v;
p += Step;
} while(--len);
}
void blend_hline(int x, int y,
unsigned len,
const color_type& c,
int8u cover)
{
if (c.a) {
value_type* p = (value_type*)m_rbuf->row(y) + x * Step + Offset;
calc_type alpha = (calc_type(c.a) * (cover + 1)) >> 8;
if(alpha == base_mask) {
do {
*p = c.v;
p += Step;
} while(--len);
} else {
do {
Blender::blend_pix(p, c.v, alpha, cover);
p += Step;
} while(--len);
}
}
}
void blend_solid_hspan(int x, int y,
unsigned len,
const color_type& c,
const int8u* covers)
{
if (c.a) {
value_type* p = (value_type*)m_rbuf->row(y) + x * Step + Offset;
do {
calc_type alpha = (calc_type(c.a) * (calc_type(*covers) + 1)) >> 8;
if(alpha == base_mask) {
*p = c.v;
} else {
Blender::blend_pix(p, c.v, alpha, *covers);
}
p += Step;
++covers;
} while(--len);
}
}
private:
rendering_buffer* m_rbuf;
};
typedef blender_gray<gray8> blender_gray8;
typedef pixel_formats_gray<blender_gray8, 1, 0> pixfmt_gray8;
}
#endif
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