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/**
* @module CPixelFormat_Indexed8
* @author Guenther Neuwirth (0626638), Manuel Mausz (0728348)
* @brief Implementation of CPixelFormat handling 24bit indexed bitmaps.
* @date 02.05.2009
*/
#include <boost/numeric/conversion/cast.hpp>
#include <assert.h>
#include "cpixelformat_indexed8.h"
#include "cbitmap.h"
using namespace std;
void CPixelFormat_Indexed8::getPixel(RGBPIXEL& pixel, uint32_t x, uint32_t y)
{
if (m_bitmap->getPixelData() == NULL)
throw PixelFormatError("No pixelbuffer allocated.");
if (m_bitmap->getColorTable().size() == 0)
return;
assert(m_bitmap->getPixelDataSize() > 0);
uint32_t offset = y * m_bitmap->getWidth() + x;
/* boundary check */
if (offset * sizeof(uint32_t) + sizeof(uint32_t) > m_bitmap->getPixelDataSize())
throw PixelFormatError("Pixel position is out of range.");
uint32_t color = *((uint32_t *)m_bitmap->getPixelData() + offset);
map<uint32_t, RGBPIXEL *>::iterator it;
if ((it = m_bitmap->getColorTable().find(color)) == m_bitmap->getColorTable().end())
throw PixelFormatError("Pixel has no reference in colortable.");
pixel.red = (*it).second->red;
pixel.green = (*it).second->green;
pixel.blue = (*it).second->blue;
}
/*----------------------------------------------------------------------------*/
void CPixelFormat_Indexed8::setPixel(const RGBPIXEL& pixel, uint32_t x, uint32_t y)
{
if (m_bitmap->getPixelData() == NULL)
throw PixelFormatError("No pixelbuffer allocated.");
/* if colortable is empty there are no pixels */
if (m_bitmap->getColorTable().size() == 0)
return;
assert(m_bitmap->getPixelDataSize() > 0);
uint32_t offset = y * m_bitmap->getWidth() + x;
/* boundary check */
if (offset * sizeof(uint32_t) + sizeof(uint32_t) > m_bitmap->getPixelDataSize())
throw PixelFormatError("Pixel position is out of range.");
/* try to look up color in colortable */
map<uint32_t, RGBPIXEL *>::iterator it;
for(it = m_bitmap->getColorTable().begin(); it != m_bitmap->getColorTable().end(); it++)
{
if ((*it).second->red == pixel.red &&
(*it).second->green == pixel.green &&
(*it).second->blue == pixel.blue)
break;
}
uint32_t index = (*it).first;
/* need to get a new entry for our color */
if (it == m_bitmap->getColorTable().end())
{
index = (*it).first + 1;
RGBPIXEL *pixelptr = new RGBPIXEL;
pixelptr->red = pixel.red;
pixelptr->green = pixel.green;
pixelptr->blue = pixel.blue;
m_bitmap->getColorTable()[ index ] = pixelptr;
}
/* set color */
*((uint32_t *)m_bitmap->getPixelData() + offset) = index;
}
/* vim: set et sw=2 ts=2: */
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