/
agg_pixfmt_rgba32_pre.h
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agg_pixfmt_rgba32_pre.h
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//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.2
// Copyright (C) 2002-2004 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_RGBA32_PRE_INCLUDED
#define AGG_PIXFMT_RGBA32_PRE_INCLUDED
#include <string.h>
#include "agg_basics.h"
#include "agg_color_rgba8.h"
#include "agg_rendering_buffer.h"
namespace agg
{
//=================================================pixel_formats_rgba32_pre
template<class Order> class pixel_formats_rgba32_pre
{
public:
typedef rgba8 color_type;
private:
//--------------------------------------------------------------------
static inline void copy_pix(int8u* p, const color_type& c)
{
p[Order::R] = (int8u)c.r;
p[Order::G] = (int8u)c.g;
p[Order::B] = (int8u)c.b;
p[Order::A] = (int8u)c.a;
}
//--------------------------------------------------------------------
static inline void blend_pix(int8u* p, const color_type& c,
unsigned cover, unsigned alpha)
{
p[Order::R] = (int8u)((p[Order::R] * alpha + ((c.r * cover) << 8)) >> 16);
p[Order::G] = (int8u)((p[Order::G] * alpha + ((c.g * cover) << 8)) >> 16);
p[Order::B] = (int8u)((p[Order::B] * alpha + ((c.b * cover) << 8)) >> 16);
p[Order::A] = (int8u)(255 - ((alpha * (255 - p[Order::A])) >> 16));
}
//--------------------------------------------------------------------
static inline void copy_or_blend_pix(int8u* p, const color_type& c, unsigned cover)
{
unsigned alpha = 65535 - cover * c.a;
if(alpha < 65535)
{
if(alpha <= 65535-255*255)
{
copy_pix(p, c);
}
else
{
blend_pix(p, c, cover, alpha);
}
}
}
//--------------------------------------------------------------------
static inline void copy_or_blend_pix(int8u* p, const color_type& c)
{
unsigned alpha = 255 - c.a;
if(alpha < 255)
{
if(alpha == 0)
{
copy_pix(p, c);
}
else
{
p[Order::R] = (int8u)((p[Order::R] * alpha + (c.r << 8)) >> 8);
p[Order::G] = (int8u)((p[Order::G] * alpha + (c.g << 8)) >> 8);
p[Order::B] = (int8u)((p[Order::B] * alpha + (c.b << 8)) >> 8);
p[Order::A] = (int8u)(255 - ((alpha * (255 - p[Order::A])) >> 8));
}
}
}
public:
//--------------------------------------------------------------------
pixel_formats_rgba32_pre(rendering_buffer& rb)
: m_rbuf(&rb)
{
}
//--------------------------------------------------------------------
unsigned width() const { return m_rbuf->width(); }
unsigned height() const { return m_rbuf->height(); }
//--------------------------------------------------------------------
color_type pixel(int x, int y)
{
int8u* p = m_rbuf->row(y) + (x << 2);
return color_type(p[Order::R], p[Order::G], p[Order::B], p[Order::A]);
}
//--------------------------------------------------------------------
void copy_pixel(int x, int y, const color_type& c)
{
int8u* p = m_rbuf->row(y) + (x << 2);
p[Order::R] = (int8u)c.r;
p[Order::G] = (int8u)c.g;
p[Order::B] = (int8u)c.b;
p[Order::A] = (int8u)c.a;
}
//--------------------------------------------------------------------
void blend_pixel(int x, int y, const color_type& c, int8u cover)
{
copy_or_blend_pix(m_rbuf->row(y) + (x << 2), c, cover);
}
//--------------------------------------------------------------------
void copy_hline(int x, int y, unsigned len, const color_type& c)
{
int32u v;
copy_pix((int8u*)&v, c);
int32u* p32 = (int32u*)(m_rbuf->row(y)) + x;
do
{
*p32++ = v;
}
while(--len);
}
//--------------------------------------------------------------------
void copy_vline(int x, int y, unsigned len, const color_type& c)
{
int32u v;
copy_pix((int8u*)&v, c);
int8u* p = m_rbuf->row(y) + (x << 2);
do
{
*(int32u*)p = v;
p += m_rbuf->stride();
}
while(--len);
}
//--------------------------------------------------------------------
void blend_hline(int x, int y, unsigned len,
const color_type& c, int8u cover)
{
unsigned alpha = unsigned(cover) * c.a;
if(alpha == 255*255)
{
int32u v;
copy_pix((int8u*)&v, c);
int32u* p32 = (int32u*)(m_rbuf->row(y)) + x;
do
{
*p32++ = v;
}
while(--len);
}
else
{
int8u* p = m_rbuf->row(y) + (x << 2);
alpha = 65535 - alpha;
do
{
blend_pix(p, c, cover, alpha);
p += 4;
}
while(--len);
}
}
//--------------------------------------------------------------------
void blend_vline(int x, int y, unsigned len,
const color_type& c, int8u cover)
{
int8u* p = m_rbuf->row(y) + (x << 2);
unsigned alpha = unsigned(cover) * c.a;
if(alpha == 255*255)
{
int32u v;
copy_pix((int8u*)&v, c);
do
{
*(int32u*)p = v;
p += m_rbuf->stride();
}
while(--len);
}
else
{
alpha = 65535 - alpha;
do
{
blend_pix(p, c, cover, alpha);
p += m_rbuf->stride();
}
while(--len);
}
}
//--------------------------------------------------------------------
void copy_from(const rendering_buffer& from,
int xdst, int ydst,
int xsrc, int ysrc,
unsigned len)
{
memmove(m_rbuf->row(ydst) + xdst * 4,
(const void*)(from.row(ysrc) + xsrc * 4), len * 4);
}
//--------------------------------------------------------------------
void blend_solid_hspan(int x, int y, unsigned len,
const color_type& c, const int8u* covers)
{
int8u* p = m_rbuf->row(y) + (x << 2);
do
{
copy_or_blend_pix(p, c, *covers++);
p += 4;
}
while(--len);
}
//--------------------------------------------------------------------
void blend_solid_vspan(int x, int y, unsigned len,
const color_type& c, const int8u* covers)
{
int8u* p = m_rbuf->row(y) + (x << 2);
do
{
copy_or_blend_pix(p, c, *covers++);
p += m_rbuf->stride();
}
while(--len);
}
//--------------------------------------------------------------------
void blend_color_hspan(int x, int y, unsigned len,
const color_type* colors,
const int8u* covers,
int8u cover)
{
int8u* p = m_rbuf->row(y) + (x << 2);
do
{
copy_or_blend_pix(p, *colors++, covers ? *covers++ : cover);
p += 4;
}
while(--len);
}
//--------------------------------------------------------------------
void blend_color_vspan(int x, int y, unsigned len,
const color_type* colors,
const int8u* covers,
int8u cover)
{
int8u* p = m_rbuf->row(y) + (x << 2);
do
{
copy_or_blend_pix(p, *colors++, covers ? *covers++ : cover);
p += m_rbuf->stride();
}
while(--len);
}
private:
rendering_buffer* m_rbuf;
};
typedef pixel_formats_rgba32_pre<order_rgba32> pixfmt_rgba32_pre; //----pixfmt_rgba32_pre
typedef pixel_formats_rgba32_pre<order_argb32> pixfmt_argb32_pre; //----pixfmt_argb32_pre
typedef pixel_formats_rgba32_pre<order_abgr32> pixfmt_abgr32_pre; //----pixfmt_abgr32_pre
typedef pixel_formats_rgba32_pre<order_bgra32> pixfmt_bgra32_pre; //----pixfmt_bgra32_pre
}
#endif