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/*
* Copyright (C) 2010-2011 Simon Andreas Eugster ([email protected])
* This file is not a Frei0r plugin but a collection of ideas.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "frei0r.hpp"
#include <iostream>
//#define DEBUG
typedef unsigned char uchar;
struct ABGR {
uchar r;
uchar g;
uchar b;
uchar a;
ABGR blend(const ABGR &other, const float opacity)
{
#ifdef DEBUG
if (opacity < 0 || opacity > 1) {
std::cerr << "Timeout indicator: Opacity must be within 0 and 1!" << std::endl;
}
#endif
const float l = opacity;
const float r = 1-opacity;
ABGR ret;
ret.r = l*r + r*other.r;
ret.g = l*g + r*other.g;
ret.b = l*b + r*other.b;
ret.a = other.a;
return ret;
}
};
union ABGRPixel {
ABGR color;
uint32_t value;
};
class Timeout : public frei0r::filter
{
public:
Timeout(unsigned int width, unsigned int height)
{
register_param(m_time, "time", "Current time");
register_param(m_color, "color", "Indicator colour");
register_param(m_transparency, "transparency", "Indicator transparency");
W = std::min(width, height) / 20;
H = W;
x0 = width-2*W;
y0 = height-H;
}
~Timeout()
{
// Delete member variables if necessary.
}
virtual void update()
{
std::copy(in, in + width*height, out);
ABGR col;
col.r = 255*m_color.r;
col.g = 255*m_color.g;
col.b = 255*m_color.b;
col.a = 255;
float yt = y0 - (1-m_time)*H;
ABGR *outAsABGR = (ABGR*) out;
#ifdef DEBUG
#define printcol(x) std::cout << #x ": [ " << (int) x.r << " | " << (int) x.g << " | " << (int) x.b << " ]" << std::endl;
std::cout << "r = " << m_color.r << ", g = " << m_color.g << std::endl;
ABGR blended = col.blend(outAsABGR[0], .5);
printcol(col);
printcol(outAsABGR[0]);
printcol(blended);
#undef printcol
#endif
for (int y = y0; y >= int(yt); y--) {
float factor = 1-m_transparency;
if (y == int(yt)) {
factor *= 1 - (yt-int(yt));
}
for (int x = x0; x < x0+W; x++) {
outAsABGR[width*y + x] = col.blend(outAsABGR[width*y + x], factor);
}
}
}
private:
// The various f0r_params are adjustable parameters.
// This one determines the size of the black bar in this example.
f0r_param_double m_time;
f0r_param_color m_color;
f0r_param_double m_transparency;
unsigned int x0, y0;
unsigned int W , H ;
};
frei0r::construct<Timeout> plugin("Timeout indicator",
"Timeout indicators e.g. for slides.",
"Simon A. Eugster",
0,1,
F0R_COLOR_MODEL_RGBA8888);
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