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  1. /**
  2.  * @module cpixelformat_24
  3.  * @author Manuel Mausz, 0728348
  4.  * @brief  Implementation of CPixelFormat handling 24bit color Windows Bitmaps.
  5.  * @date   18.04.2009
  6.  */
  7.  
  8. #include <boost/numeric/conversion/cast.hpp>
  9. #include "cpixelformat_24.h"
  10.  
  11. using namespace std;
  12.  
  13. void CPixelFormat_24::setPixel(const uint32_t *pixel, uint32_t x, uint32_t y)
  14. {
  15.   if (m_bitmap->getPixelData() == NULL)
  16.     throw PixelFormatError("No pixelbuffer allocated.");
  17.  
  18.   uint32_t rowsize = 4 * static_cast<uint32_t>(
  19.     ((CPixelFormat_24::getBitCount() * abs(m_bitmap->getInfoHeader().biWidth)) + 31) / 32
  20.   );
  21.  
  22.   /* if height is positive the y-coordinates are mirrored */
  23.   if (m_bitmap->getInfoHeader().biHeight > 0)
  24.     y = m_bitmap->getInfoHeader().biHeight - y - 1;
  25.   uint32_t offset = y * rowsize + x * (4 * getBitCount() / 32);
  26.  
  27.   /* boundary check */
  28.   if (offset + 3 * sizeof(uint8_t) > m_bitmap->getInfoHeader().biSizeImage)
  29.     throw PixelFormatError("Pixel position is out of range.");
  30.  
  31.   /* convert color values to correct types */
  32.   uint8_t data[3];
  33.   try
  34.   {
  35.     data[0] = boost::numeric_cast<uint8_t>(pixel[2]);
  36.     data[1] = boost::numeric_cast<uint8_t>(pixel[1]);
  37.     data[2] = boost::numeric_cast<uint8_t>(pixel[0]);
  38.   }
  39.   catch(boost::numeric::bad_numeric_cast& ex)
  40.   {
  41.     throw PixelFormatError("Unable to convert pixelcolor to correct size: " + string(ex.what()));
  42.   }
  43.  
  44.   copy(data, data + 3, m_bitmap->getPixelData() + offset);
  45. }
  46.  
  47. /* vim: set et sw=2 ts=2: */
  48.