39241fe228
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9933 a95241bf-73f2-0310-859d-f6bbb57e9c96
108 lines
3.1 KiB
C++
Executable File
108 lines
3.1 KiB
C++
Executable File
//----------------------------------------------------------------------------
|
|
// 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
|
|
//----------------------------------------------------------------------------
|
|
//
|
|
// color type gray8
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
#ifndef AGG_GRAY8_INCLUDED
|
|
#define AGG_GRAY8_INCLUDED
|
|
|
|
#include "agg_basics.h"
|
|
#include "agg_color_rgba.h"
|
|
#include "agg_color_rgba8.h"
|
|
|
|
namespace agg
|
|
{
|
|
|
|
//===================================================================gray8
|
|
struct gray8
|
|
{
|
|
int8u v;
|
|
int8u a;
|
|
|
|
//--------------------------------------------------------------------
|
|
gray8() {}
|
|
|
|
//--------------------------------------------------------------------
|
|
gray8(unsigned v_, unsigned a_=255) :
|
|
v(int8u(v_)), a(int8u(a_)) {}
|
|
|
|
//--------------------------------------------------------------------
|
|
gray8(const rgba& c) :
|
|
v(int8u((0.299*c.r + 0.587*c.g + 0.114*c.b) * 255.0 + 0.5)),
|
|
a(int8u(c.a*255.0)) {}
|
|
|
|
//--------------------------------------------------------------------
|
|
gray8(const rgba8& c) :
|
|
v((c.r*77 + c.g*150 + c.b*29) >> 8),
|
|
a(c.a) {}
|
|
|
|
//--------------------------------------------------------------------
|
|
void clear()
|
|
{
|
|
v = a = 0;
|
|
}
|
|
|
|
//--------------------------------------------------------------------
|
|
const gray8& transparent()
|
|
{
|
|
a = 0;
|
|
return *this;
|
|
}
|
|
|
|
//--------------------------------------------------------------------
|
|
void opacity(double a_)
|
|
{
|
|
if(a_ < 0.0) a_ = 0.0;
|
|
if(a_ > 1.0) a_ = 1.0;
|
|
a = int8u(a_ * 255.0);
|
|
}
|
|
|
|
//--------------------------------------------------------------------
|
|
double opacity() const
|
|
{
|
|
return double(a) / 255.0;
|
|
}
|
|
|
|
//--------------------------------------------------------------------
|
|
gray8 gradient(gray8 c, double k) const
|
|
{
|
|
gray8 ret;
|
|
int ik = int(k * 256);
|
|
ret.v = int8u(int(v) + (((int(c.v) - int(v)) * ik) >> 8));
|
|
ret.a = int8u(int(a) + (((int(c.a) - int(a)) * ik) >> 8));
|
|
return ret;
|
|
}
|
|
|
|
//--------------------------------------------------------------------
|
|
gray8 pre() const
|
|
{
|
|
return gray8((v*a) >> 8, a);
|
|
|
|
}
|
|
|
|
//--------------------------------------------------------------------
|
|
static gray8 no_color() { return gray8(0,0); }
|
|
};
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#endif
|