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/**
* @module cpixelformat_BGR555
* @author Guenther Neuwirth (0626638), Manuel Mausz (0728348)
* @brief Implementation of CPixelFormat handling BGR555 color (real color)
* Windows Bitmaps.
* @date 18.04.2009
*/
#include <boost/numeric/conversion/cast.hpp>
#include <assert.h>
#include "cpixelformat_bgr555.h"
#include "cbitmap.h"
using namespace std;
void CPixelFormat_BGR555::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 */
uint8_t *o = m_bitmap->getPixelData() + offset;
pixel.blue = (*(uint16_t *)o & BGR555_BLUE_MASK) >> BGR555_BLUE_SHIFT;
pixel.green = (*(uint16_t *)o & BGR555_GREEN_MASK) >> BGR555_GREEN_SHIFT;
pixel.red = (*(uint16_t *)o & BGR555_RED_MASK) >> BGR555_RED_SHIFT;
}
/*----------------------------------------------------------------------------*/
void CPixelFormat_BGR555::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 *o = m_bitmap->getPixelData() + offset;
*(uint16_t *)o = (uint16_t)(((pixel.blue << BGR555_BLUE_SHIFT) & BGR555_BLUE_MASK) |
((pixel.green << BGR555_GREEN_SHIFT) & BGR555_GREEN_MASK) |
((pixel.red << BGR555_RED_SHIFT) & BGR555_RED_MASK));
}
/* vim: set et sw=2 ts=2: */
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