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/**
* @module cpixelformat_BGR24
* @author Guenther Neuwirth (0626638), Manuel Mausz (0728348)
* @brief Implementation of CPixelFormat handling 24bit color Windows Bitmaps.
* @date 18.04.2009
*/
#include <boost/numeric/conversion/cast.hpp>
#include <assert.h>
#include "cpixelformat_bgr24.h"
#include "cbitmap.h"
using namespace std;
void CPixelFormat_BGR24::getPixel(RGBPIXEL& pixel, uint32_t x, uint32_t y)
{
if (m_bitmap->getPixelData() == NULL)
throw PixelFormatError("No pixelbuffer allocated.");
assert(m_bitmap->getPixelDataSize() > 0);
assert(m_bitmap->getRowSize() > 0);
/* if the y-coordinates are mirrored */
if (m_bitmap->isMirrored())
y = m_bitmap->getHeight() - y - 1;
uint32_t offset = y * m_bitmap->getRowSize() + x * (4 * getBitCount() / 32);
/* boundary check */
if (offset + getBitCount()/8 > m_bitmap->getPixelDataSize())
throw PixelFormatError("Pixel position is out of range.");
/* get pixel */
pixel.red = *(m_bitmap->getPixelData() + offset + 2);
pixel.green = *(m_bitmap->getPixelData() + offset + 1);
pixel.blue = *(m_bitmap->getPixelData() + offset);
}
/*----------------------------------------------------------------------------*/
void CPixelFormat_BGR24::setPixel(const RGBPIXEL& pixel, uint32_t x, uint32_t y)
{
if (m_bitmap->getPixelData() == NULL)
throw PixelFormatError("No pixelbuffer allocated.");
assert(m_bitmap->getPixelDataSize() > 0);
assert(m_bitmap->getRowSize() > 0);
/* if the y-coordinates are mirrored */
if (m_bitmap->isMirrored())
y = m_bitmap->getHeight() - y - 1;
uint32_t offset = y * m_bitmap->getRowSize() + x * (4 * getBitCount() / 32);
/* boundary check */
if (offset + getBitCount()/8 > m_bitmap->getPixelDataSize())
throw PixelFormatError("Pixel position is out of range.");
/* convert color values to correct types */
uint8_t data[3];
try
{
data[0] = boost::numeric_cast<uint8_t>(pixel.blue);
data[1] = boost::numeric_cast<uint8_t>(pixel.green);
data[2] = boost::numeric_cast<uint8_t>(pixel.red);
}
catch(boost::numeric::bad_numeric_cast& ex)
{
throw PixelFormatError("Unable to convert pixelcolor to correct size: " + string(ex.what()));
}
copy(data, data + 3, m_bitmap->getPixelData() + offset);
}
/* vim: set et sw=2 ts=2: */
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