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ximabmp.cpp from aMSN at Krugle

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/*
 * File:	ximabmp.cpp
 * Purpose:	Platform Independent BMP Image Class Loader and Writer
 * 07/Aug/2001 Davide Pizzolato - www.xdp.it
 * CxImage version 5.99c 17/Oct/2004
 */

#include "ximabmp.h"

#if CXIMAGE_SUPPORT_BMP

#include "ximaiter.h" 

////////////////////////////////////////////////////////////////////////////////
#if CXIMAGE_SUPPORT_ENCODE
////////////////////////////////////////////////////////////////////////////////
bool CxImageBMP::Encode(CxFile * hFile)
{

	if (EncodeSafeCheck(hFile)) return false;

	BITMAPFILEHEADER	hdr;

	hdr.bfType = 0x4d42;   // 'BM' WINDOWS_BITMAP_SIGNATURE
	hdr.bfSize = GetSize() + 14 /*sizeof(BITMAPFILEHEADER)*/;
	hdr.bfReserved1 = hdr.bfReserved2 = 0;
	hdr.bfOffBits = 14 /*sizeof(BITMAPFILEHEADER)*/ + head.biSize + GetPaletteSize();

	 //copy attributes
	memcpy(pDib,&head,sizeof(BITMAPINFOHEADER));
    // Write the file header
	hFile->Write(&hdr,min(14,sizeof(BITMAPFILEHEADER)),1);
    // Write the DIB header and the pixels
	hFile->Write(pDib,GetSize(),1);
	return true;
}
////////////////////////////////////////////////////////////////////////////////
#endif //CXIMAGE_SUPPORT_ENCODE
////////////////////////////////////////////////////////////////////////////////
#if CXIMAGE_SUPPORT_DECODE
////////////////////////////////////////////////////////////////////////////////
bool CxImageBMP::CheckFormat(BYTE * buffer, DWORD size, basic_image_information *basic_info){
	BITMAPFILEHEADER   *bf;
	BITMAPINFOHEADER   *bi;

	bf = (BITMAPFILEHEADER *) buffer;

	if (size < (sizeof(*bf)+sizeof(*bi))) return false;
	if (bf->bfType != BFT_BITMAP) return false;
	bi = (BITMAPINFOHEADER *) (buffer + sizeof(*bf));

	create_basic_image_information(CXIMAGE_FORMAT_BMP,bi->biWidth,bi->biHeight, basic_info);
	return true;
}


bool CxImageBMP::Decode(CxFile * hFile)
{
	if (hFile == NULL) return false;

	BITMAPFILEHEADER   bf;
	DWORD off = hFile->Tell(); //<CSC>
  try {
    if (hFile->Read(&bf,min(14,sizeof(bf)),1)==0) throw "Not a BMP";
    if (bf.bfType != BFT_BITMAP) { //do we have a RC HEADER?
        bf.bfOffBits = 0L;
        hFile->Seek(off,SEEK_SET);
    }

	BITMAPINFOHEADER bmpHeader;
	if (!DibReadBitmapInfo(hFile,&bmpHeader)) throw "Error reading BMP info";
	DWORD dwCompression=bmpHeader.biCompression;
	DWORD dwBitCount=bmpHeader.biBitCount; //preserve for BI_BITFIELDS compression <Thomas Ernst>
	bool bIsOldBmp = bmpHeader.biSize == sizeof(BITMAPCOREHEADER);

	bool bTopDownDib = bmpHeader.biHeight<0; //<Flanders> check if it's a top-down bitmap
	if (bTopDownDib) bmpHeader.biHeight=-bmpHeader.biHeight;

	if (info.nEscape == -1) {
		// Return output dimensions only
		head.biWidth = bmpHeader.biWidth;
		head.biHeight = bmpHeader.biHeight;
		throw "output dimensions returned";
	}

	if (!Create(bmpHeader.biWidth,bmpHeader.biHeight,bmpHeader.biBitCount,CXIMAGE_FORMAT_BMP))
		throw "Can't allocate memory";

	head.biXPelsPerMeter = bmpHeader.biXPelsPerMeter;
	head.biYPelsPerMeter = bmpHeader.biYPelsPerMeter;
	info.xDPI = (long) floor(bmpHeader.biXPelsPerMeter * 254.0 / 10000.0 + 0.5);
	info.yDPI = (long) floor(bmpHeader.biYPelsPerMeter * 254.0 / 10000.0 + 0.5);

	if (info.nEscape) throw "Cancelled"; // <vho> - cancel decoding

    RGBQUAD *pRgb = GetPalette();
    if (pRgb){
        if (bIsOldBmp){
             // convert a old color table (3 byte entries) to a new
             // color table (4 byte entries)
            hFile->Read((void*)pRgb,DibNumColors(&bmpHeader) * sizeof(RGBTRIPLE),1);
            for (int i=DibNumColors(&head)-1; i>=0; i--){
                pRgb[i].rgbRed      = ((RGBTRIPLE *)pRgb)[i].rgbtRed;
                pRgb[i].rgbBlue     = ((RGBTRIPLE *)pRgb)[i].rgbtBlue;
                pRgb[i].rgbGreen    = ((RGBTRIPLE *)pRgb)[i].rgbtGreen;
                pRgb[i].rgbReserved = (BYTE)0;
            }
        } else {
            hFile->Read((void*)pRgb,DibNumColors(&bmpHeader) * sizeof(RGBQUAD),1);
			//force rgbReserved=0, to avoid problems with some WinXp bitmaps
			for (unsigned int i=0; i<head.biClrUsed; i++) pRgb[i].rgbReserved=0;
        }
    }

	if (info.nEscape) throw "Cancelled"; // <vho> - cancel decoding

	switch (dwBitCount) {
		case 32 :
			if (bf.bfOffBits != 0L) hFile->Seek(off + bf.bfOffBits,SEEK_SET);
			if (dwCompression == BI_BITFIELDS || dwCompression == BI_RGB){
				long imagesize=4*head.biHeight*head.biWidth;
				BYTE* buff32=(BYTE*)malloc(imagesize);
				if (buff32){
					hFile->Read(buff32, imagesize,1); // read in the pixels
					Bitfield2RGB(buff32,0,0,0,32);
					free(buff32);
				} else throw "can't allocate memory";
			} else throw "unknown compression";
			break;
		case 24 :
			if (bf.bfOffBits != 0L) hFile->Seek(off + bf.bfOffBits,SEEK_SET);
			if (dwCompression == BI_RGB){
				hFile->Read(info.pImage, head.biSizeImage,1); // read in the pixels
			} else throw "unknown compression";
			break;
		case 16 :
		{
			DWORD bfmask[3];
			if (dwCompression == BI_BITFIELDS)
			{
				hFile->Read(bfmask, 12, 1);
			} else {
				bfmask[0]=0x7C00; bfmask[1]=0x3E0; bfmask[2]=0x1F; //RGB555
			}
			// bf.bfOffBits required after the bitfield mask <Cui Ying Jie>
			if (bf.bfOffBits != 0L) hFile->Seek(off + bf.bfOffBits,SEEK_SET);
			// read in the pixels
			hFile->Read(info.pImage, head.biHeight*((head.biWidth+1)/2)*4,1);
			// transform into RGB
			Bitfield2RGB(info.pImage,(WORD)bfmask[0],(WORD)bfmask[1],(WORD)bfmask[2],16);
			break;
		}
		case 8 :
		case 4 :
		case 1 :
		if (bf.bfOffBits != 0L) hFile->Seek(off + bf.bfOffBits,SEEK_SET);
		switch (dwCompression) {
			case BI_RGB :
				hFile->Read(info.pImage, head.biSizeImage,1); // read in the pixels
				break;
			case BI_RLE4 :
			{
				BYTE status_byte = 0;
				BYTE second_byte = 0;
				int scanline = 0;
				int bits = 0;
				BOOL low_nibble = FALSE;
				CImageIterator iter(this);

				for (BOOL bContinue = TRUE; bContinue;) {
					hFile->Read(&status_byte, sizeof(BYTE), 1);
					switch (status_byte) {
						case RLE_COMMAND :
							hFile->Read(&status_byte, sizeof(BYTE), 1);
							switch (status_byte) {
								case RLE_ENDOFLINE :
									bits = 0;
									scanline++;
									low_nibble = FALSE;
									break;
								case RLE_ENDOFBITMAP :
									bContinue=FALSE;
									break;
								case RLE_DELTA :
								{
									// read the delta values
									BYTE delta_x;
									BYTE delta_y;
									hFile->Read(&delta_x, sizeof(BYTE), 1);
									hFile->Read(&delta_y, sizeof(BYTE), 1);
									// apply them
									bits       += delta_x / 2;
									scanline   += delta_y;
									break;
								}
								default :
									hFile->Read(&second_byte, sizeof(BYTE), 1);
									BYTE *sline = iter.GetRow(scanline);
									for (int i = 0; i < status_byte; i++) {
										if (low_nibble) {
											if ((DWORD)(sline+bits) < (DWORD)(info.pImage+head.biSizeImage)){
												*(sline + bits) |=  (second_byte & 0x0F);
											}
											if (i != status_byte - 1)
												hFile->Read(&second_byte, sizeof(BYTE), 1);
											bits++;
										} else {
											if ((DWORD)(sline+bits) < (DWORD)(info.pImage+head.biSizeImage)){
												*(sline + bits) = (BYTE)(second_byte & 0xF0);
											}
										}
										low_nibble = !low_nibble;
									}
									if ((((status_byte+1) >> 1) & 1 )== 1)
										hFile->Read(&second_byte, sizeof(BYTE), 1);												
									break;
							};
							break;
						default :
						{
							BYTE *sline = iter.GetRow(scanline);
							hFile->Read(&second_byte, sizeof(BYTE), 1);
							for (unsigned i = 0; i < status_byte; i++) {
								if (low_nibble) {
									if ((DWORD)(sline+bits) < (DWORD)(info.pImage+head.biSizeImage)){
										*(sline + bits) |= (second_byte & 0x0F);
									}
									bits++;
								} else {
									if ((DWORD)(sline+bits) < (DWORD)(info.pImage+head.biSizeImage)){
										*(sline + bits) = (BYTE)(second_byte & 0xF0);
									}
								}				
								low_nibble = !low_nibble;
							}
						}
						break;
					};
				}
				break;
			}
			case BI_RLE8 :
			{
				BYTE status_byte = 0;
				BYTE second_byte = 0;
				int scanline = 0;
				int bits = 0;
				CImageIterator iter(this);

				for (BOOL bContinue = TRUE; bContinue; ) {
					hFile->Read(&status_byte, sizeof(BYTE), 1);
					switch (status_byte) {
						case RLE_COMMAND :
							hFile->Read(&status_byte, sizeof(BYTE), 1);
							switch (status_byte) {
								case RLE_ENDOFLINE :
									bits = 0;
									scanline++;
									break;
								case RLE_ENDOFBITMAP :
									bContinue=FALSE;
									break;
								case RLE_DELTA :
								{
									// read the delta values
									BYTE delta_x;
									BYTE delta_y;
									hFile->Read(&delta_x, sizeof(BYTE), 1);
									hFile->Read(&delta_y, sizeof(BYTE), 1);
									// apply them
									bits     += delta_x;
									scanline += delta_y;
									break;
								}
								default :
									hFile->Read((void *)(iter.GetRow(scanline) + bits), sizeof(BYTE) * status_byte, 1);
									// align run length to even number of bytes 
									if ((status_byte & 1) == 1)
										hFile->Read(&second_byte, sizeof(BYTE), 1);												
									bits += status_byte;													
									break;								
							};
							break;
						default :
							BYTE *sline = iter.GetRow(scanline);
							hFile->Read(&second_byte, sizeof(BYTE), 1);
							for (unsigned i = 0; i < status_byte; i++) {
								if ((DWORD)bits<info.dwEffWidth){
									*(sline + bits) = second_byte;
									bits++;					
								} else {
									bContinue = FALSE;
									break;
								}
							}
							break;
					};
				}
				break;
			}
			default :								
				throw "compression type not supported";
		}
	}

	if (bTopDownDib) Flip(); //<Flanders>

  } catch (const char *message) {
	strncpy(info.szLastError,message,255);
	if (info.nEscape==-1) return true;
	return false;
  }
    return true;
}
////////////////////////////////////////////////////////////////////////////////
/*  ReadDibBitmapInfo()
 *
 *  Will read a file in DIB format and return a global HANDLE to its
 *  BITMAPINFO.  This function will work with both "old" and "new"
 *  bitmap formats, but will always return a "new" BITMAPINFO.
 */
bool CxImageBMP::DibReadBitmapInfo(CxFile* fh, BITMAPINFOHEADER *pdib)
{
	if ((fh==NULL)||(pdib==NULL)) return false;

    if (fh->Read(pdib,sizeof(BITMAPINFOHEADER),1)==0) return false;

    BITMAPCOREHEADER   bc;

    switch (pdib->biSize) // what type of bitmap info is this?
    {
        case sizeof(BITMAPINFOHEADER):
            break;

		case 64: //sizeof(OS2_BMP_HEADER):
            fh->Seek((long)(64 - sizeof(BITMAPINFOHEADER)),SEEK_CUR);
			break;

        case sizeof(BITMAPCOREHEADER):
            bc = *(BITMAPCOREHEADER*)pdib;
            pdib->biSize               = bc.bcSize;
            pdib->biWidth              = (DWORD)bc.bcWidth;
            pdib->biHeight             = (DWORD)bc.bcHeight;
            pdib->biPlanes             =  bc.bcPlanes;
            pdib->biBitCount           =  bc.bcBitCount;
            pdib->biCompression        = BI_RGB;
            pdib->biSizeImage          = 0;
            pdib->biXPelsPerMeter      = 0;
            pdib->biYPelsPerMeter      = 0;
            pdib->biClrUsed            = 0;
            pdib->biClrImportant       = 0;

			fh->Seek((long)(sizeof(BITMAPCOREHEADER)-sizeof(BITMAPINFOHEADER)), SEEK_CUR);

            break;
        default:
			//give a last chance
			 if (pdib->biSize>(sizeof(BITMAPINFOHEADER))&&
				(pdib->biSizeImage==(unsigned long)(pdib->biHeight*((((pdib->biBitCount*pdib->biWidth)+31)/32)*4)))&&
				(pdib->biPlanes==1)&&(pdib->biCompression==BI_RGB)&&(pdib->biClrUsed==0))
			 {
	             fh->Seek((long)(pdib->biSize - sizeof(BITMAPINFOHEADER)),SEEK_CUR);
				 break;
			 }
			return false;
    }

    FixBitmapInfo(pdib);

    return true;
}
////////////////////////////////////////////////////////////////////////////////
#endif //CXIMAGE_SUPPORT_DECODE
////////////////////////////////////////////////////////////////////////////////
#endif 	// CXIMAGE_SUPPORT_BMP
////////////////////////////////////////////////////////////////////////////////

See more files for this project here

aMSN

A very nice MSN compatible messenger application, aMSN Messenger is a multiplatform MSN messenger clone. Works pretty much like its Windows based counterpart. Perfect for keeping in touch with those friends who have not yet seen the light. Works on linux

Project homepage: http://sourceforge.net/projects/amsn
Programming language(s): C,C++,PHP,Tcl,XML
License: other

  Rules.mk
  cximage.dsp
  cximage.dsw
  license.txt
  xfile.h
  ximabmp.cpp
  ximabmp.h
  ximacfg.h
  ximadef.h
  ximadsp.cpp
  ximaenc.cpp
  ximaexif.cpp
  ximage.cpp
  ximage.h
  ximagif.cpp
  ximagif.h
  ximahist.cpp
  ximainfo.cpp
  ximaint.cpp
  ximaiter.h
  ximajpg.cpp
  ximajpg.h
  ximalpha.cpp
  ximalyr.cpp
  ximapal.cpp
  ximapng.cpp
  ximapng.h
  ximasel.cpp
  ximatga.cpp
  ximatga.h
  ximath.cpp
  ximath.h
  ximatran.cpp
  xiofile.h
  xmemfile.cpp
  xmemfile.h