www.pudn.com > Cimage.zip > CMAP.CPP

/* 
 * Colour map class 
 * 
 */ 
 
#include "stdafx.h" 
 
#include "cmap.h" 
 
#ifdef _DEBUG 
#define new DEBUG_NEW 
#undef THIS_FILE 
static char THIS_FILE[] = __FILE__; 
#endif 
 
CImagePalette::CImagePalette(const int n, const unsigned char *red, const unsigned char *green, const unsigned char *blue) 
{ 
  Create(n, red, green, blue); 
} 
 
CImagePalette::CImagePalette(const CImagePalette *pal) 
{ 
  int count = ((CImagePalette *)pal)->GetEntryCount(); 
   
 LOGPALETTE* logPal = (LOGPALETTE*) 
		 new BYTE[sizeof(LOGPALETTE) + count*sizeof(PALETTEENTRY)]; 
  logPal->palVersion = 0x300; 
  logPal->palNumEntries = count; 
  pal->GetPaletteEntries(0, count, logPal->palPalEntry); 
   
  CPalette::CreatePalette(logPal); 
   
  delete logPal; 
} 
 
CImagePalette::~CImagePalette(void) 
{ 
  HPALETTE pal = (HPALETTE) (*this); 
  Detach(); 
  ::DeleteObject(pal); 
} 
 
BOOL CImagePalette::Create(const int n, const unsigned char *red, const unsigned char *green, const unsigned char *blue) 
{ 
  if ((HPALETTE) *this) 
    return FALSE; 
     
  NPLOGPALETTE npPal = (NPLOGPALETTE)LocalAlloc(LMEM_FIXED, sizeof(LOGPALETTE) +  
                        (WORD)n * sizeof(PALETTEENTRY)); 
  if (!npPal) 
    return(FALSE); 
 
  npPal->palVersion = 0x300; 
  npPal->palNumEntries = n; 
 
  int i; 
  for (i = 0; i < n; i ++) 
  { 
    npPal->palPalEntry[i].peRed = red[i]; 
    npPal->palPalEntry[i].peGreen = green[i]; 
    npPal->palPalEntry[i].peBlue = blue[i]; 
    npPal->palPalEntry[i].peFlags = 0; 
  } 
  HPALETTE ms_palette = ::CreatePalette((LPLOGPALETTE)npPal); 
  LocalFree((HANDLE)npPal); 
  Attach(ms_palette); 
   
  return TRUE; 
} 
 
int CImagePalette::GetPixel(const unsigned char red, const unsigned char green, const unsigned char blue) 
{ 
  return ::GetNearestPaletteIndex((HPALETTE) (*this), RGB(red, green, blue)); 
} 
 
BOOL CImagePalette::GetRGB(const int index, unsigned char *red, unsigned char *green, unsigned char *blue) 
{ 
  if (index < 0 || index > 255) 
         return FALSE; 
 
  PALETTEENTRY entry; 
  if (::GetPaletteEntries((HPALETTE) (*this), index, 1, &entry)) 
  { 
         *red = entry.peRed; 
         *green = entry.peGreen; 
         *blue = entry.peBlue; 
         return TRUE; 
  } else 
         return FALSE; 
}