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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* pixelbuffer.cc
*
* Thu Nov 10 09:00:38 CET 2011
* Copyright 2011 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of CamSync.
*
* CamSync 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.
*
* CamSync 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 CamSync; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "pixelbuffer.h"
#include <stdio.h>
GUI::PixelBuffer::PixelBuffer(size_t width, size_t height)
{
buf = NULL;
realloc(width, height);
}
GUI::PixelBuffer::~PixelBuffer()
{
if(buf) free(buf);
}
void GUI::PixelBuffer::realloc(size_t width, size_t height)
{
if(buf) free(buf);
buf = (unsigned char *)calloc(width * height, 3);
this->width = width;
this->height = height;
}
#define PX(k) (x + y * width) * 3 + k
void GUI::PixelBuffer::setPixel(size_t x, size_t y,
unsigned char red,
unsigned char green,
unsigned char blue,
unsigned char alpha)
{
if(x >= width || y >= height) return;
/*
float a,b;
getAlpha(alpha, 255, a, b);
buf[PX(0)] = (unsigned char)((float)red * a + (float)buf[PX(0)] * b);
buf[PX(0)] /= (a + b);
buf[PX(1)] = (unsigned char)((float)green * a + (float)buf[PX(1)] * b);
buf[PX(1)] /= (a + b);
buf[PX(2)] = (unsigned char)((float)blue * a + (float)buf[PX(2)] * b);
buf[PX(2)] /= (a + b);
*/
unsigned int a = alpha;
unsigned int b = 255 - alpha;
buf[PX(0)] = (unsigned char)(((int)red * a + (int)buf[PX(0)] * b) / 255);
buf[PX(1)] = (unsigned char)(((int)green * a + (int)buf[PX(1)] * b) / 255);
buf[PX(2)] = (unsigned char)(((int)blue * a + (int)buf[PX(2)] * b) / 255);
}
static int idx = 0;
GUI::PixelBufferAlpha::PixelBufferAlpha(size_t width, size_t height)
{
this->idx = ::idx++;
buf = NULL;
x = y = 10;
realloc(width, height);
}
GUI::PixelBufferAlpha::~PixelBufferAlpha()
{
if(buf) free(buf);
}
void GUI::PixelBufferAlpha::realloc(size_t width, size_t height)
{
if(buf) free(buf);
buf = (unsigned char *)calloc(width * height, 4);
this->width = width;
this->height = height;
}
#undef PX
#define PX(k) (x + y * width) * 4 + k
void GUI::PixelBufferAlpha::setPixel(size_t x, size_t y,
unsigned char red,
unsigned char green,
unsigned char blue,
unsigned char alpha)
{
if(x >= width || y >= height) return;
buf[PX(0)] = red;
buf[PX(1)] = green;
buf[PX(2)] = blue;
buf[PX(3)] = alpha;
}
// http://en.wikipedia.org/wiki/Alpha_compositing
static void getAlpha(unsigned char _a, unsigned char _b, float &a, float &b)
{
a = _a / 255.0;
b = _b / 255.0;
b *= (1-a);
}
void GUI::PixelBufferAlpha::addPixel(size_t x, size_t y,
unsigned char red,
unsigned char green,
unsigned char blue,
unsigned char alpha)
{
if(x >= width || y >= height) return;
if(alpha == 0) return;
float a,b;
getAlpha(alpha, buf[PX(3)], a, b);
buf[PX(0)] = (unsigned char)((float)red * a + (float)buf[PX(0)] * b);
buf[PX(0)] /= (a + b);
buf[PX(1)] = (unsigned char)((float)green * a + (float)buf[PX(1)] * b);
buf[PX(1)] /= (a + b);
buf[PX(2)] = (unsigned char)((float)blue * a + (float)buf[PX(2)] * b);
buf[PX(2)] /= (a + b);
buf[PX(3)] = (a + b) * 255;
}
void GUI::PixelBufferAlpha::addPixel(size_t x, size_t y, GUI::Colour c)
{
addPixel(x, y, c.red * 255, c.green * 255, c.blue * 255, c.alpha * 255);
}
void GUI::PixelBufferAlpha::pixel(size_t x, size_t y,
unsigned char *red,
unsigned char *green,
unsigned char *blue,
unsigned char *alpha)
{
if(x >= width || y >= height) return;
*red = buf[PX(0)];
*green = buf[PX(1)];
*blue = buf[PX(2)];
*alpha = buf[PX(3)];
}
#ifdef TEST_PIXELBUFFER
//Additional dependency files
//deps:
//Required cflags (autoconf vars may be used)
//cflags:
//Required link options (autoconf vars may be used)
//libs:
#include "test.h"
TEST_BEGIN;
// TODO: Put some testcode here (see test.h for usable macros).
TEST_END;
#endif/*TEST_PIXELBUFFER*/
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