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/** \file color-rgba.h
A class to handle a RGBA color as one unit.
Authors:
bulia byak <buliabyak@gmail.com>
Copyright (C) 2004 Authors
Released under GNU GPL, read the file 'COPYING' for more information
*/
#ifndef SEEN_COLOR_RGBA_H
#define SEEN_COLOR_RGBA_H
#include <glib/gmessages.h>
#include "libnr/nr-pixops.h"
#include "decimal-round.h"
/**
\brief A class to contain a floating point RGBA color.
*/
class ColorRGBA {
public:
/**
\brief A constructor to create the color from four floating
point values.
\param c0 Red
\param c1 Green
\param c2 Blue
\param c3 Alpha
Load the values into the array of floats in this object.
*/
ColorRGBA(float c0, float c1, float c2, float c3)
{
_c[0] = c0; _c[1] = c1;
_c[2] = c2; _c[3] = c3;
}
/**
\brief Create a quick ColorRGBA with all zeros
*/
ColorRGBA(void)
{
for (int i = 0; i < 4; i++)
_c[i] = 0.0;
}
/**
\brief A constructor to create the color from an unsigned
int, as found everywhere when dealing with colors
\param intcolor rgba32 "unsigned int representation (0xRRGGBBAA)
Separate the values and load them into the array of floats in this object.
TODO : maybe get rid of the NR_RGBA32_x C-style functions and replace
the calls with the bitshifting they do
*/
ColorRGBA(unsigned int intcolor)
{
_c[0] = NR_RGBA32_R(intcolor)/255.0;
_c[1] = NR_RGBA32_G(intcolor)/255.0;
_c[2] = NR_RGBA32_B(intcolor)/255.0;
_c[3] = NR_RGBA32_A(intcolor)/255.0;
}
/**
\brief Create a ColorRGBA using an array of floats
\param in_array The values to be placed into the object
Go through each entry in the array and put it into \c _c.
*/
ColorRGBA(float in_array[4])
{
for (int i = 0; i < 4; i++)
_c[i] = in_array[i];
}
/**
\brief Overwrite the values in this object with another \c ColorRGBA.
\param m Values to use for the array
\return This ColorRGBA object
Copy all the values from \c m into \c this.
*/
ColorRGBA &operator=(ColorRGBA const &m) {
for (unsigned i = 0 ; i < 4 ; ++i) {
_c[i] = m._c[i];
}
return *this;
}
/**
\brief Grab a particular value from the ColorRGBA object
\param i Which value to grab
\return The requested value.
First checks to make sure that the value is within the array,
and then return the value if it is.
*/
float operator[](unsigned int const i) const {
g_assert( unsigned(i) < 4 );
return _c[i];
}
/**
\brief Check to ensure that two \c ColorRGBA's are equal
\param other The guy to check against
\return Whether or not they are equal
Check each value to see if they are equal. If they all are,
return TRUE.
*/
bool operator== (const ColorRGBA other) const {
for (int i = 0; i < 4; i++) {
if (_c[i] != other[i])
return false;
}
return true;
}
bool operator!=(ColorRGBA const &o) const {
return !(*this == o);
}
/**
\brief Average two \c ColorRGBAs to create another one.
\param second The second RGBA, with this being the first
\param weight How much of each should be used. Zero is all
this while one is all the second. Default is
half and half.
This function goes through all the points in the two objects and
merges them together based on the weighting. The current objects
value are multiplied by 1.0 - weight and the second object by weight.
This means that they should always be balanced by the parameter.
*/
ColorRGBA average (const ColorRGBA second, const float weight = 0.5) const {
float returnval[4];
for (int i = 0; i < 4; i++) {
returnval[i] = _c[i] * (1.0 - weight) + second[i] * weight;
}
return ColorRGBA(returnval[0], returnval[1], returnval[2], returnval[3]);
}
/**
\brief Give the rgba32 "unsigned int" representation of the color
round each components*255 and combine them (RRGGBBAA).
WARNING : this reduces color precision (from float to 0->255 int per component)
but it should be expected since we request this kind of output
*/
unsigned int getIntValue() const {
return (int(Inkscape::decimal_round(_c[0]*255, 0)) << 24) |
(int(Inkscape::decimal_round(_c[1]*255, 0)) << 16) |
(int(Inkscape::decimal_round(_c[2]*255, 0)) << 8) |
(int(Inkscape::decimal_round(_c[3]*255, 0)));
}
private:
/** \brief Array of values that are stored. */
float _c[4];
};
#endif /* !SEEN_COLOR_RGBA_H */
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
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