www.pudn.com > cximage602_full.rar > ximaska.cpp

/* 
 * File:	ximaska.cpp 
 * Purpose:	Platform Independent SKA Image Class Loader and Writer 
 * 25/Sep/2007 Davide Pizzolato - www.xdp.it 
 * CxImage version 6.0.0 02/Feb/2008 
 */ 
 
#include "ximaska.h" 
 
#if CXIMAGE_SUPPORT_SKA 
 
//////////////////////////////////////////////////////////////////////////////// 
#if CXIMAGE_SUPPORT_DECODE 
//////////////////////////////////////////////////////////////////////////////// 
bool CxImageSKA::Decode(CxFile *hFile) 
{ 
	if (hFile==NULL) 
		return false; 
 
	// read the  header 
	SKAHEADER ska_header; 
	hFile->Read(&ska_header,sizeof(SKAHEADER),1); 
 
    ska_header.Width = ntohs(ska_header.Width); 
    ska_header.Height = ntohs(ska_header.Height); 
    ska_header.dwUnknown = ntohl(ska_header.dwUnknown); 
 
	// check header 
	if (ska_header.dwUnknown != 0x01000000 || 
		ska_header.Width > 0x7FFF || ska_header.Height > 0x7FFF || 
		ska_header.BppExp != 3) 
		return false; 
 
	if (info.nEscape == -1){ 
		head.biWidth = ska_header.Width ; 
		head.biHeight= ska_header.Height; 
		info.dwType = CXIMAGE_FORMAT_SKA; 
		return true; 
	} 
 
	int bpp = 1<Read(ppal,nColors*sizeof(rgb_color),1); 
	SetPalette(ppal,nColors); 
	free(ppal); 
 
	//read the image 
	hFile->Read(GetBits(),ska_header.Width*ska_header.Height,1); 
 
	//reorder rows 
	if (GetEffWidth() != ska_header.Width){ 
		BYTE *src,*dst; 
		src = GetBits() + ska_header.Width*(ska_header.Height-1); 
		dst = GetBits(ska_header.Height-1); 
		for(int y=0;y 8)	{ 
		strcpy(info.szLastError,"SKA Images must be 8 bit or less"); 
		return false; 
	} 
 
	SKAHEADER ska_header; 
 
	ska_header.Width = (unsigned short)GetWidth(); 
	ska_header.Height = (unsigned short)GetHeight(); 
	ska_header.BppExp = 3; 
	ska_header.dwUnknown = 0x01000000; 
 
    ska_header.Width = ntohs(ska_header.Width); 
    ska_header.Height = ntohs(ska_header.Height); 
    ska_header.dwUnknown = ntohl(ska_header.dwUnknown); 
 
	hFile->Write(&ska_header,sizeof(SKAHEADER),1); 
 
    ska_header.Width = ntohs(ska_header.Width); 
    ska_header.Height = ntohs(ska_header.Height); 
    ska_header.dwUnknown = ntohl(ska_header.dwUnknown); 
 
	if (head.biBitCount<8) IncreaseBpp(8); 
 
	rgb_color pal[256]; 
	for(int idx=0; idx<256; idx++){ 
		GetPaletteColor(idx,&(pal[idx].r),&(pal[idx].g),&(pal[idx].b)); 
	} 
 
	hFile->Write(pal,256*sizeof(rgb_color),1); 
 
	BYTE* src = GetBits(ska_header.Height-1); 
	for(int y=0;yWrite(src,ska_header.Width,1); 
		src -= GetEffWidth(); 
	} 
 
	return true; 
} 
//////////////////////////////////////////////////////////////////////////////// 
#endif // CXIMAGE_SUPPORT_ENCODE 
//////////////////////////////////////////////////////////////////////////////// 
#endif // CXIMAGE_SUPPORT_SKA