Added support for relative line numbers.

Added instructions for, brk and cont. (They are still untested...)
Parser code cleanup. Removed garbage output to stderr.
Reorganize the repository structure.
Updated BLR2 code move it into archive.
Added BLR1 files.

1 files changed, 1681 insertions, 0 deletions

diff --git a/archive/hge/CxImage/ximagif.cpp b/archive/hge/CxImage/ximagif.cpp
new file mode 100644
index 0000000..8c94b9e
--- /dev/null
+++ b/archive/hge/CxImage/ximagif.cpp
@@ -0,0 +1,1681 @@
+/*

+ * File:	ximagif.cpp

+ * Purpose:	Platform Independent GIF Image Class Loader and Writer

+ * 07/Aug/2001 Davide Pizzolato - www.xdp.it

+ * CxImage version 7.0.0 31/Dec/2010

+ */

+

+#include "ximagif.h"

+

+#if CXIMAGE_SUPPORT_GIF

+

+#include "ximaiter.h"

+

+#if defined (_WIN32_WCE)

+	#define assert(s)

+#else

+	#include <assert.h>

+#endif

+

+////////////////////////////////////////////////////////////////////////////////

+CxImageGIF::CxImageGIF(): CxImage(CXIMAGE_FORMAT_GIF)

+{

+	buf = new uint8_t [GIFBUFTAM + 1];

+

+	stack = new uint8_t [MAX_CODES + 1];

+	suffix = new uint8_t [MAX_CODES + 1];

+	prefix = new uint16_t [MAX_CODES + 1];

+

+	htab = new int32_t [HSIZE];

+	codetab = new uint16_t [HSIZE];

+

+	byte_buff = new uint8_t [257];

+	accum = new char [256];

+	m_comment = new char [256];

+

+	m_loops=0;

+	info.dispmeth=0;

+	m_comment[0]='\0';

+

+}

+////////////////////////////////////////////////////////////////////////////////

+CxImageGIF::~CxImageGIF()

+{

+	delete [] buf;

+

+	delete [] stack;

+	delete [] suffix;

+	delete [] prefix;

+

+	delete [] htab;

+	delete [] codetab;

+

+	delete [] byte_buff;

+	delete [] accum;

+	delete [] m_comment;

+}

+////////////////////////////////////////////////////////////////////////////////

+#if CXIMAGE_SUPPORT_DECODE

+////////////////////////////////////////////////////////////////////////////////

+bool CxImageGIF::Decode(CxFile *fp)

+{

+	/* AD - for transparency */

+	struct_dscgif dscgif;

+	struct_image image;

+	struct_TabCol TabCol;

+

+	if (fp == NULL) return false;

+

+	fp->Read(&dscgif,/*sizeof(dscgif)*/13,1);

+	//if (strncmp(dscgif.header,"GIF8",3)!=0) {

+	if (strncmp(dscgif.header,"GIF8",4)!=0) return FALSE;

+

+	// Avoid Byte order problem with Mac <AMSN>

+	dscgif.scrheight = m_ntohs(dscgif.scrheight);

+	dscgif.scrwidth = m_ntohs(dscgif.scrwidth);

+

+	if (info.nEscape == -1) {

+		// Return output dimensions only

+		head.biWidth = dscgif.scrwidth;

+		head.biHeight = dscgif.scrheight;

+		info.dwType = CXIMAGE_FORMAT_GIF;

+		return true;

+	}

+

+	/* AD - for interlace */

+	TabCol.sogct = (int16_t)(1 << ((dscgif.pflds & 0x07)+1));

+	TabCol.colres = (int16_t)(((dscgif.pflds & 0x70) >> 4) + 1);

+

+	// assume that the image is a truecolor-gif if

+	// 1) no global color map found

+	// 2) (image.w, image.h) of the 1st image != (dscgif.scrwidth, dscgif.scrheight)

+	int32_t bTrueColor=0;

+	CxImage* imaRGB=NULL;

+

+	// Global colour map?

+	if (dscgif.pflds & 0x80)

+		fp->Read(TabCol.paleta,sizeof(struct rgb_color)*TabCol.sogct,1);

+	else

+		bTrueColor++;	//first chance for a truecolor gif

+

+	int32_t first_transparent_index = 0;

+

+	int32_t iImage = 0;

+	info.nNumFrames=get_num_frames(fp,&TabCol,&dscgif);

+

+	if ((info.nFrame<0)||(info.nFrame>=info.nNumFrames)) return false;

+

+	//it cannot be a true color GIF with only one frame

+	if (info.nNumFrames == 1)

+		bTrueColor=0;

+

+	char ch;

+	bool bPreviousWasNull = true;

+	int32_t  prevdispmeth = 0;

+	CxImage *previousFrame = NULL;

+

+	for (BOOL bContinue = TRUE; bContinue; )

+	{

+		if (fp->Read(&ch, sizeof(ch), 1) != 1) {break;}

+

+		if (info.nEscape > 0) return false; // <vho> - cancel decoding

+		if (bPreviousWasNull || ch==0)

+		{

+			switch (ch)

+			{

+			case '!': // extension

+				{

+				bContinue = DecodeExtension(fp);

+				break;

+				}

+			case ',': // image

+				{

+				assert(sizeof(image) == 9);

+				fp->Read(&image,sizeof(image),1);

+				//avoid byte order problems with Solaris <candan> <AMSN>

+				image.l = m_ntohs(image.l);

+				image.t = m_ntohs(image.t);

+				image.w = m_ntohs(image.w);

+				image.h = m_ntohs(image.h);

+

+				if (((image.l + image.w) > dscgif.scrwidth)||((image.t + image.h) > dscgif.scrheight))

+					break;

+

+				// check if it could be a truecolor gif

+				if ((iImage==0) && (image.w != dscgif.scrwidth) && (image.h != dscgif.scrheight))

+					bTrueColor++;

+

+				rgb_color  locpal[256];				//Local Palette

+				rgb_color* pcurpal = TabCol.paleta;	//Current Palette

+				int16_t palcount = TabCol.sogct;		//Current Palette color count

+

+				// Local colour map?

+				if (image.pf & 0x80) {

+					palcount = (int16_t)(1 << ((image.pf & 0x07) +1));

+					assert(3 == sizeof(struct rgb_color));

+					fp->Read(locpal,sizeof(struct rgb_color)*palcount,1);

+					pcurpal = locpal;

+				}

+

+				int32_t bpp; //<DP> select the correct bit per pixel value

+				if		(palcount <= 2)  bpp = 1;

+				else if (palcount <= 16) bpp = 4;

+				else					 bpp = 8;

+

+				CxImageGIF backimage;

+				backimage.CopyInfo(*this);

+				if (iImage==0){

+					//first frame: build image background

+					backimage.Create(dscgif.scrwidth, dscgif.scrheight, bpp, CXIMAGE_FORMAT_GIF);

+					first_transparent_index = info.nBkgndIndex;

+					backimage.Clear((uint8_t)gifgce.transpcolindex);

+					previousFrame = new CxImage(backimage);

+					previousFrame->SetRetreiveAllFrames(false);

+				} else {

+				//generic frame: handle disposal method from previous one

+				/*Values :  0 -   No disposal specified. The decoder is

+								  not required to take any action.

+							1 -   Do not dispose. The graphic is to be left

+								  in place.

+							2 -   Restore to background color. The area used by the

+								  graphic must be restored to the background color.

+							3 -   Restore to previous. The decoder is required to

+								  restore the area overwritten by the graphic with

+								  what was there prior to rendering the graphic.

+				*/

+				/*	backimage.Copy(*this);

+					if (prevdispmeth==2){

+						backimage.Clear((uint8_t)first_transparent_index);

+					}*/

+					if (prevdispmeth==2){

+						backimage.Copy(*this,false,false,false);

+						backimage.Clear((uint8_t)first_transparent_index);

+					} else if (prevdispmeth==3) {

+						backimage.Copy(*this,false,false,false);

+						backimage.Create(previousFrame->GetWidth(),

+							previousFrame->GetHeight(),

+							previousFrame->GetBpp(),CXIMAGE_FORMAT_GIF);

+						memcpy(backimage.GetDIB(),previousFrame->GetDIB(),

+							backimage.GetSize());

+						//backimage.AlphaSet(*previousFrame);

+					} else {

+						backimage.Copy(*this);

+					}

+				}

+

+				//active frame

+				Create(image.w, image.h, bpp, CXIMAGE_FORMAT_GIF);

+

+				if ((image.pf & 0x80) || (dscgif.pflds & 0x80)) {

+					uint8_t r[256], g[256], b[256];

+					int32_t i;//, has_white = 0;

+

+					for (i=0; i < palcount; i++) {

+						r[i] = pcurpal[i].r;

+						g[i] = pcurpal[i].g;

+						b[i] = pcurpal[i].b;

+						//if (RGB(r[i],g[i],b[i]) == 0xFFFFFF) has_white = 1;

+					}

+

+					// Force transparency colour white...

+					//if (0) if (info.nBkgndIndex >= 0)

+					//	r[info.nBkgndIndex] = g[info.nBkgndIndex] = b[info.nBkgndIndex] = 255;

+					// Fill in with white // AD

+					if (info.nBkgndIndex >= 0) {

+						while (i < 256)	{

+							//has_white = 1;

+							r[i] = g[i] = b[i] = 255;

+							i++;

+						}

+					}

+

+					// Force last colour to white...   // AD

+					//if ((info.nBkgndIndex >= 0) && !has_white) {

+					//	r[255] = g[255] = b[255] = 255;

+					//}

+

+					SetPalette((info.nBkgndIndex >= 0 ? 256 : palcount), r, g, b);

+				}

+

+				CImageIterator* iter = new CImageIterator(this);

+				iter->Upset();

+				int32_t badcode=0;

+				ibf = GIFBUFTAM+1;

+

+				interlaced = image.pf & 0x40;

+				iheight = image.h;

+				istep = 8;

+				iypos = 0;

+				ipass = 0;

+

+				int32_t pos_start = fp->Tell();

+				//if (interlaced) log << "Interlaced" << endl;

+				decoder(fp, iter, image.w, badcode);

+				delete iter;

+

+				if (info.nEscape) return false; // <vho> - cancel decoding

+

+				if (bTrueColor<2 ){ //standard GIF: mix frame with background

+					backimage.IncreaseBpp(bpp);

+					backimage.GifMix(*this,image);

+					backimage.SetTransIndex(first_transparent_index);

+					backimage.SetPalette(GetPalette());

+					Transfer(backimage,false);

+				} else { //it's a truecolor gif!

+					//force full image decoding

+					info.nFrame=info.nNumFrames-1;

+					//build the RGB image

+					if (imaRGB==NULL) imaRGB = new CxImage(dscgif.scrwidth,dscgif.scrheight,24,CXIMAGE_FORMAT_GIF);

+					//copy the partial image into the full RGB image

+					for(int32_t y=0;y<image.h;y++){

+						for (int32_t x=0;x<image.w;x++){

+							imaRGB->SetPixelColor(x+image.l,dscgif.scrheight-1-image.t-y,GetPixelColor(x,image.h-y-1));

+						}

+					}

+				}

+

+				prevdispmeth = (gifgce.flags >> 2) & 0x7;

+

+				//restore the correct position in the file for the next image

+				if (badcode){

+					seek_next_image(fp,pos_start);

+				} else {

+					fp->Seek(-(ibfmax - ibf - 1), SEEK_CUR);

+				}

+

+				if (info.bGetAllFrames && imaRGB == NULL) {

+					if (iImage == 0) {

+						DestroyFrames();

+						ppFrames = new CxImage*[info.nNumFrames];

+						for(int32_t frameIdx = 0; frameIdx < info.nNumFrames; frameIdx++){

+							ppFrames[frameIdx] = NULL;

+						}

+					}

+					ppFrames[iImage] = new CxImage(*this);

+					ppFrames[iImage]->SetRetreiveAllFrames(false);

+				}

+				if (prevdispmeth <= 1) {

+					delete previousFrame;

+					previousFrame = new CxImage(*this);

+					previousFrame->SetRetreiveAllFrames(false);

+				}

+

+				if ((info.nFrame==iImage) && (info.bGetAllFrames==false)) bContinue=false; else iImage++;

+

+				break;

+				}

+			case ';': //terminator

+				bContinue=false;

+				break;

+			default:

+				bPreviousWasNull = (ch==0);

+				break;

+			}

+		}

+	}

+

+	if (bTrueColor>=2 && imaRGB){

+		if (gifgce.flags & 0x1){

+			imaRGB->SetTransColor(GetPaletteColor((uint8_t)info.nBkgndIndex));

+			imaRGB->SetTransIndex(0);

+		}

+		Transfer(*imaRGB);

+	}

+	delete imaRGB;

+

+	delete previousFrame;

+

+	return true;

+

+}

+////////////////////////////////////////////////////////////////////////////////

+bool CxImageGIF::DecodeExtension(CxFile *fp)

+{

+	bool bContinue;

+	uint8_t count;

+	uint8_t fc;

+

+	bContinue = (1 == fp->Read(&fc, sizeof(fc), 1));

+	if (bContinue) {

+		/* AD - for transparency */

+		if (fc == 0xF9)	{

+			bContinue = (1 == fp->Read(&count, sizeof(count), 1));

+			if (bContinue) {

+				assert(sizeof(gifgce) == 4);

+				bContinue = (count == fp->Read(&gifgce, 1, sizeof(gifgce)));

+				gifgce.delaytime = m_ntohs(gifgce.delaytime); // Avoid Byte order problem with Mac <AMSN>

+				if (bContinue) {

+					info.nBkgndIndex  = (gifgce.flags & 0x1) ? gifgce.transpcolindex : -1;

+					info.dwFrameDelay = gifgce.delaytime;

+					SetDisposalMethod((gifgce.flags >> 2) & 0x7);

+		}	}	}

+

+		if (fc == 0xFE) { //<DP> Comment block

+			bContinue = (1 == fp->Read(&count, sizeof(count), 1));

+			if (bContinue) {

+				bContinue = (1 == fp->Read(m_comment, count, 1));

+				m_comment[count]='\0';

+		}	}

+

+		if (fc == 0xFF) { //<DP> Application Extension block

+			bContinue = (1 == fp->Read(&count, sizeof(count), 1));

+			if (bContinue) {

+				bContinue = (count==11);

+				if (bContinue){

+					char AppID[11];

+					bContinue = (1 == fp->Read(AppID, count, 1));

+					if (bContinue) {

+						bContinue = (1 == fp->Read(&count, sizeof(count), 1));

+						if (bContinue) {

+							uint8_t* dati = (uint8_t*)malloc(count);

+							bContinue = (dati!=NULL);

+							if (bContinue){

+								bContinue = (1 == fp->Read(dati, count, 1));

+								if (count>2){

+									m_loops = dati[1]+256*dati[2];

+								}

+							}

+							free(dati);

+		}	}	}	}	}

+

+		while (bContinue && fp->Read(&count, sizeof(count), 1) && count) {

+			//log << "Skipping " << count << " bytes" << endl;

+			fp->Seek(count, SEEK_CUR);

+		}

+	}

+	return bContinue;

+

+}

+////////////////////////////////////////////////////////////////////////////////

+#endif //CXIMAGE_SUPPORT_DECODE

+////////////////////////////////////////////////////////////////////////////////

+

+//   - This external (machine specific) function is expected to return

+// either the next uint8_t from the GIF file, or a negative error number.

+int32_t CxImageGIF::get_byte(CxFile* file)

+{

+	if (ibf>=GIFBUFTAM){

+		// FW 06/02/98 >>>

+		ibfmax = (int32_t)file->Read( buf , 1 , GIFBUFTAM) ;

+		if( ibfmax < GIFBUFTAM ) buf[ ibfmax ] = 255 ;

+		// FW 06/02/98 <<<

+		ibf = 0;

+	}

+	if (ibf>=ibfmax) return -1; //<DP> avoid overflows

+	return buf[ibf++];

+}

+////////////////////////////////////////////////////////////////////////////////

+/*   - This function takes a full line of pixels (one uint8_t per pixel) and

+ * displays them (or does whatever your program wants with them...).  It

+ * should return zero, or negative if an error or some other event occurs

+ * which would require aborting the decode process...  Note that the length

+ * passed will almost always be equal to the line length passed to the

+ * decoder function, with the sole exception occurring when an ending code

+ * occurs in an odd place in the GIF file...  In any case, linelen will be

+ * equal to the number of pixels passed...

+*/

+int32_t CxImageGIF::out_line(CImageIterator* iter, uint8_t *pixels, int32_t linelen)

+{

+	if (iter == NULL || pixels == NULL)

+		return -1;

+

+	//<DP> for 1 & 4 bpp images, the pixels are compressed

+	if (head.biBitCount < 8){

+		for(int32_t x=0;x<head.biWidth;x++){

+			uint8_t pos;

+			uint8_t* iDst= pixels + (x*head.biBitCount >> 3);

+			if (head.biBitCount==4){

+				pos = (uint8_t)(4*(1-x%2));

+				*iDst &= ~(0x0F<<pos);

+				*iDst |= ((pixels[x] & 0x0F)<<pos);

+			} else if (head.biBitCount==1){

+				pos = (uint8_t)(7-x%8);

+				*iDst &= ~(0x01<<pos);

+				*iDst |= ((pixels[x] & 0x01)<<pos);

+			}

+		}

+	}

+

+	/* AD - for interlace */

+	if (interlaced) {

+		iter->SetY(iheight-iypos-1);

+		iter->SetRow(pixels, linelen);

+

+		if ((iypos += istep) >= iheight) {

+			do {

+				if (ipass++ > 0) istep /= 2;

+				iypos = istep / 2;

+			}

+			while (iypos > iheight);

+		}

+		return 0;

+	} else {

+		if (iter->ItOK()) {

+			iter->SetRow(pixels, linelen);

+			(void)iter->PrevRow();

+			return 0;

+		} else {

+			//	 puts("chafeo");

+			return -1;

+		}

+	}

+}

+////////////////////////////////////////////////////////////////////////////////

+#if CXIMAGE_SUPPORT_ENCODE

+////////////////////////////////////////////////////////////////////////////////

+// SaveFile - writes GIF87a gif file

+// Randy Spann 6/15/97

+// R.Spann@ConnRiver.net

+bool CxImageGIF::Encode(CxFile * fp)

+{

+	if (EncodeSafeCheck(fp)) return false;

+

+	if(head.biBitCount > 8)	{

+		//strcpy(info.szLastError,"GIF Images must be 8 bit or less");

+		//return FALSE;

+		return EncodeRGB(fp);

+	}

+

+	if ( GetNumFrames()>1 && ppFrames ) {

+		return Encode(fp, ppFrames, GetNumFrames() );

+	}

+

+	EncodeHeader(fp);

+

+	EncodeExtension(fp);

+

+	EncodeComment(fp);

+

+	EncodeBody(fp);

+

+	fp->PutC(';'); // Write the GIF file terminator

+

+	return true; // done!

+}

+////////////////////////////////////////////////////////////////////////////////

+bool CxImageGIF::Encode(CxFile * fp, CxImage ** pImages, int32_t pagecount, bool bLocalColorMap, bool bLocalDispMeth)

+{

+  cx_try {

+	if (fp==NULL) cx_throw("invalid file pointer");

+	if (pImages==NULL || pagecount<=0 || pImages[0]==NULL) cx_throw("multipage GIF, no images!");

+

+	int32_t i;

+	for (i=0; i<pagecount; i++){

+		if (pImages[i]==NULL)

+			cx_throw("Bad image pointer");

+		if (!(pImages[i]->IsValid()))

+			cx_throw("Empty image");

+		if (pImages[i]->GetNumColors()==0)

+			cx_throw("CxImageGIF::Encode cannot create animated GIFs with a true color frame. Use DecreaseBpp before");

+	}

+

+	CxImageGIF ghost;

+

+	//write the first image

+	ghost.Ghost(pImages[0]);

+	ghost.EncodeHeader(fp);

+

+	if (m_loops!=1){

+		ghost.SetLoops(max(0,m_loops-1));

+		ghost.EncodeLoopExtension(fp);

+	}

+

+	if (bLocalDispMeth) {

+		ghost.EncodeExtension(fp);

+	} else {

+		uint8_t dm = ghost.GetDisposalMethod();

+		ghost.SetDisposalMethod(GetDisposalMethod());

+		ghost.EncodeExtension(fp);

+		ghost.SetDisposalMethod(dm);

+	}

+

+	EncodeComment(fp);

+

+	ghost.EncodeBody(fp);

+

+	for (i=1; i<pagecount; i++){

+		ghost.Ghost(pImages[i]);

+

+		if (bLocalDispMeth) {

+			ghost.EncodeExtension(fp);

+		} else {

+			uint8_t dm = ghost.GetDisposalMethod();

+			ghost.SetDisposalMethod(GetDisposalMethod());

+			ghost.EncodeExtension(fp);

+			ghost.SetDisposalMethod(dm);

+		}

+

+		ghost.EncodeBody(fp,bLocalColorMap);

+	}

+

+	fp->PutC(';'); // Write the GIF file terminator

+

+  } cx_catch {

+	  if (strcmp(message,"")) strncpy(info.szLastError,message,255);

+	  return false;

+  }

+	return true;

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::EncodeHeader(CxFile *fp)

+{

+	fp->Write("GIF89a",1,6);	   //GIF Header

+

+	Putword(head.biWidth,fp);			   //Logical screen descriptor

+	Putword(head.biHeight,fp);

+

+	uint8_t Flags;

+	if (head.biClrUsed==0){

+		Flags=0x11;

+	} else {

+		Flags = 0x80;

+		Flags |=(head.biBitCount - 1) << 5;

+		Flags |=(head.biBitCount - 1);

+	}

+

+	fp->PutC(Flags); //GIF "packed fields"

+	fp->PutC(0);	 //GIF "BackGround"

+	fp->PutC(0);	 //GIF "pixel aspect ratio"

+

+	if (head.biClrUsed!=0){

+		RGBQUAD* pPal = GetPalette();

+		for(uint32_t i=0; i<head.biClrUsed; ++i)

+		{

+			fp->PutC(pPal[i].rgbRed);

+			fp->PutC(pPal[i].rgbGreen);

+			fp->PutC(pPal[i].rgbBlue);

+		}

+	}

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::EncodeExtension(CxFile *fp)

+{

+	// TRK BEGIN : transparency

+	fp->PutC('!');

+	fp->PutC(TRANSPARENCY_CODE);

+

+	gifgce.flags = 0;

+	gifgce.flags |= ((info.nBkgndIndex != -1) ? 1 : 0);

+	gifgce.flags |= ((GetDisposalMethod() & 0x7) << 2);

+	gifgce.delaytime = (uint16_t)info.dwFrameDelay;

+	gifgce.transpcolindex = (uint8_t)info.nBkgndIndex;

+

+	//Invert byte order in case we use a byte order arch, then set it back <AMSN>

+	gifgce.delaytime = m_ntohs(gifgce.delaytime);

+	fp->PutC(sizeof(gifgce));

+	fp->Write(&gifgce, sizeof(gifgce), 1);

+	gifgce.delaytime = m_ntohs(gifgce.delaytime);

+

+	fp->PutC(0);

+	// TRK END

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::EncodeLoopExtension(CxFile *fp)

+{

+	fp->PutC('!');		//byte  1  : 33 (hex 0x21) GIF Extension code

+	fp->PutC(255);		//byte  2  : 255 (hex 0xFF) Application Extension Label

+	fp->PutC(11);		//byte  3  : 11 (hex (0x0B) Length of Application Block (eleven bytes of data to follow)

+	fp->Write("NETSCAPE2.0",11,1);

+	fp->PutC(3);			//byte 15  : 3 (hex 0x03) Length of Data Sub-Block (three bytes of data to follow)

+	fp->PutC(1);			//byte 16  : 1 (hex 0x01)

+	Putword(m_loops,fp); //bytes 17 to 18 : 0 to 65535, an unsigned integer in lo-hi byte format.

+						//This indicate the number of iterations the loop should be executed.

+	fp->PutC(0);			//bytes 19       : 0 (hex 0x00) a Data Sub-block Terminator.

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::EncodeBody(CxFile *fp, bool bLocalColorMap)

+{

+	curx = 0;

+	cury = head.biHeight - 1;	//because we read the image bottom to top

+	CountDown = (int32_t)head.biWidth * (int32_t)head.biHeight;

+

+	fp->PutC(',');

+

+	Putword(info.xOffset,fp);

+	Putword(info.yOffset,fp);

+	Putword(head.biWidth,fp);

+	Putword(head.biHeight,fp);

+

+	uint8_t Flags=0x00; //non-interlaced (0x40 = interlaced) (0x80 = LocalColorMap)

+	if (bLocalColorMap)	{ Flags|=0x80; Flags|=head.biBitCount-1; }

+	fp->PutC(Flags);

+

+	if (bLocalColorMap){

+		Flags|=0x87;

+		RGBQUAD* pPal = GetPalette();

+		for(uint32_t i=0; i<head.biClrUsed; ++i)

+		{

+			fp->PutC(pPal[i].rgbRed);

+			fp->PutC(pPal[i].rgbGreen);

+			fp->PutC(pPal[i].rgbBlue);

+		}

+	}

+

+	int32_t InitCodeSize = head.biBitCount <=1 ? 2 : head.biBitCount;

+	 // Write out the initial code size

+	fp->PutC((uint8_t)InitCodeSize);

+

+	 // Go and actually compress the data

+	switch (GetCodecOption(CXIMAGE_FORMAT_GIF))

+	{

+	case 1:	//uncompressed

+		compressNONE(InitCodeSize+1, fp);

+		break;

+	case 2: //RLE

+		compressRLE(InitCodeSize+1, fp);

+		break;

+	default: //LZW

+		compressLZW(InitCodeSize+1, fp);

+	}

+

+	 // Write out a Zero-length packet (to end the series)

+	fp->PutC(0);

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::EncodeComment(CxFile *fp)

+{

+	uint32_t n = (uint32_t) strlen(m_comment);

+	if (n>255) n=255;

+	if (n) {

+		fp->PutC('!');	//extension code:

+		fp->PutC(254);	//comment extension

+		fp->PutC((uint8_t)n);	//size of comment

+		fp->Write(m_comment,n,1);

+		fp->PutC(0);	//block terminator

+	}

+}

+////////////////////////////////////////////////////////////////////////////////

+bool CxImageGIF::EncodeRGB(CxFile *fp)

+{

+	EncodeHeader(fp);

+

+//	EncodeLoopExtension(fp);

+

+	EncodeComment(fp);

+

+	uint32_t w,h;

+	w=h=0;

+	const int32_t cellw = 17;

+	const int32_t cellh = 15;

+	CxImageGIF tmp;

+	for (int32_t y=0;y<head.biHeight;y+=cellh){

+		for (int32_t x=0;x<head.biWidth;x+=cellw){

+			if ((head.biWidth -x)<cellw) w=head.biWidth -x; else w=cellw;

+			if ((head.biHeight-y)<cellh) h=head.biHeight-y; else h=cellh;

+

+			if (w!=tmp.GetWidth() || h!=tmp.GetHeight()) tmp.Create(w,h,8);

+

+			if (IsTransparent()){

+				tmp.SetTransIndex(0);

+				tmp.SetPaletteColor(0,GetTransColor());

+			}

+

+			uint8_t i;

+			for (uint32_t j=0;j<h;j++){

+				for (uint32_t k=0;k<w;k++){

+					i=(uint8_t)(1+k+cellw*j);

+					tmp.SetPaletteColor(i,GetPixelColor(x+k,head.biHeight-y-h+j));

+					tmp.SetPixelIndex(k,j,tmp.GetNearestIndex(tmp.GetPaletteColor(i)));

+				}

+			}

+

+			tmp.SetOffset(x,y);

+			tmp.EncodeExtension(fp);

+			tmp.EncodeBody(fp,true);

+		}

+	}

+

+	fp->PutC(';'); // Write the GIF file terminator

+

+	return true; // done!

+}

+////////////////////////////////////////////////////////////////////////////////

+#endif // CXIMAGE_SUPPORT_ENCODE

+////////////////////////////////////////////////////////////////////////////////

+// Return the next pixel from the image

+// <DP> fix for 1 & 4 bpp images

+int32_t CxImageGIF::GifNextPixel( )

+{

+	if( CountDown == 0 ) return EOF;

+	--CountDown;

+	int32_t r = GetPixelIndex(curx,cury);

+	// Bump the current X position

+	++curx;

+	if( curx == head.biWidth ){

+		curx = 0;

+		cury--;	             //bottom to top

+	}

+	return r;

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::Putword(int32_t w, CxFile *fp )

+{

+	fp->PutC((uint8_t)(w & 0xff));

+	fp->PutC((uint8_t)((w >> 8) & 0xff));

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::compressNONE( int32_t init_bits, CxFile* outfile)

+{

+	register int32_t c;

+	register int32_t ent;

+

+	// g_init_bits - initial number of bits

+	// g_outfile   - pointer to output file

+	g_init_bits = init_bits;

+	g_outfile = outfile;

+

+	 // Set up the necessary values

+	cur_accum = cur_bits = clear_flg = 0;

+	maxcode = (int16_t)MAXCODE(n_bits = g_init_bits);

+	code_int maxmaxcode = (code_int)1 << MAXBITSCODES;

+

+	ClearCode = (1 << (init_bits - 1));

+	EOFCode = ClearCode + 1;

+	free_ent = (int16_t)(ClearCode + 2);

+

+	a_count=0;

+	ent = GifNextPixel( );

+

+	output( (code_int)ClearCode );

+

+	while ( ent != EOF ) {

+		c = GifNextPixel();

+

+		output ( (code_int) ent );

+		ent = c;

+		if ( free_ent < maxmaxcode ) {

+			free_ent++;

+		} else {

+			free_ent=(int16_t)(ClearCode+2);

+			clear_flg=1;

+			output((code_int)ClearCode);

+		}

+	}

+	 // Put out the final code.

+	output( (code_int) EOFCode );

+}

+////////////////////////////////////////////////////////////////////////////////

+

+/***************************************************************************

+ *

+ *  GIFCOMPR.C       -     LZW GIF Image compression routines

+ *

+ ***************************************************************************/

+

+void CxImageGIF::compressLZW( int32_t init_bits, CxFile* outfile)

+{

+	register int32_t fcode;

+	register int32_t c;

+	register int32_t ent;

+	register int32_t hshift;

+	register int32_t disp;

+	register int32_t i;

+

+	// g_init_bits - initial number of bits

+	// g_outfile   - pointer to output file

+	g_init_bits = init_bits;

+	g_outfile = outfile;

+

+	 // Set up the necessary values

+	cur_accum = cur_bits = clear_flg = 0;

+	maxcode = (int16_t)MAXCODE(n_bits = g_init_bits);

+	code_int maxmaxcode = (code_int)1 << MAXBITSCODES;

+

+	ClearCode = (1 << (init_bits - 1));

+	EOFCode = ClearCode + 1;

+	free_ent = (int16_t)(ClearCode + 2);

+

+	a_count=0;

+	ent = GifNextPixel( );

+

+	hshift = 0;

+	for ( fcode = (int32_t) HSIZE;  fcode < 65536L; fcode *= 2L )	++hshift;

+	hshift = 8 - hshift;                /* set hash code range bound */

+	cl_hash((int32_t)HSIZE);        /* clear hash table */

+	output( (code_int)ClearCode );

+

+	while ( (c = GifNextPixel( )) != EOF ) {

+

+		fcode = (int32_t) (((int32_t) c << MAXBITSCODES) + ent);

+		i = (((code_int)c << hshift) ^ ent);    /* xor hashing */

+

+		if ( HashTabOf (i) == fcode ) {

+			ent = CodeTabOf (i);

+			continue;

+		} else if ( (int32_t)HashTabOf (i) < 0 )      /* empty slot */

+			goto nomatch;

+		disp = HSIZE - i;           /* secondary hash (after G. Knott) */

+		if ( i == 0 )	disp = 1;

+probe:

+		if ( (i -= disp) < 0 )	i += HSIZE;

+		if ( HashTabOf (i) == fcode ) {	ent = CodeTabOf (i); continue; }

+		if ( (int32_t)HashTabOf (i) > 0 )	goto probe;

+nomatch:

+		output ( (code_int) ent );

+		ent = c;

+		if ( free_ent < maxmaxcode ) {

+			CodeTabOf (i) = free_ent++; /* code -> hashtable */

+			HashTabOf (i) = fcode;

+		} else {

+			cl_hash((int32_t)HSIZE);

+			free_ent=(int16_t)(ClearCode+2);

+			clear_flg=1;

+			output((code_int)ClearCode);

+		}

+	}

+	 // Put out the final code.

+	output( (code_int)ent );

+	output( (code_int) EOFCode );

+}

+////////////////////////////////////////////////////////////////////////////////

+

+static const uint32_t code_mask[] = { 0x0000, 0x0001, 0x0003, 0x0007, 0x000F,

+								  0x001F, 0x003F, 0x007F, 0x00FF,

+								  0x01FF, 0x03FF, 0x07FF, 0x0FFF,

+								  0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF };

+

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::output( code_int  code)

+{

+	cur_accum &= code_mask[ cur_bits ];

+

+	if( cur_bits > 0 )

+		cur_accum |= ((int32_t)code << cur_bits);

+	else

+		cur_accum = code;

+

+	cur_bits += n_bits;

+

+	while( cur_bits >= 8 ) {

+		char_out( (uint32_t)(cur_accum & 0xff) );

+		cur_accum >>= 8;

+		cur_bits -= 8;

+	}

+

+	/*

+	 * If the next entry is going to be too big for the code size,

+	 * then increase it, if possible.

+	 */

+

+	if ( free_ent > maxcode || clear_flg ) {

+		if( clear_flg ) {

+			maxcode = (int16_t)MAXCODE(n_bits = g_init_bits);

+			clear_flg = 0;

+		} else {

+			++n_bits;

+			if ( n_bits == MAXBITSCODES )

+				maxcode = (code_int)1 << MAXBITSCODES; /* should NEVER generate this code */

+			else

+				maxcode = (int16_t)MAXCODE(n_bits);

+		}

+	}

+

+	if( code == EOFCode ) {

+		 // At EOF, write the rest of the buffer.

+		while( cur_bits > 0 ) {

+			char_out( (uint32_t)(cur_accum & 0xff) );

+			cur_accum >>= 8;

+			cur_bits -= 8;

+		}

+

+		flush_char();

+		g_outfile->Flush();

+

+		if(g_outfile->Error()) strcpy(info.szLastError,"Write Error in GIF file");

+	}

+}

+////////////////////////////////////////////////////////////////////////////////

+

+void CxImageGIF::cl_hash(int32_t hsize)

+

+{

+	register int32_t *htab_p = htab+hsize;

+

+	register int32_t i;

+	register int32_t m1 = -1L;

+

+	i = hsize - 16;

+

+	do {

+		*(htab_p-16)=m1;

+		*(htab_p-15)=m1;

+		*(htab_p-14)=m1;

+		*(htab_p-13)=m1;

+		*(htab_p-12)=m1;

+		*(htab_p-11)=m1;

+		*(htab_p-10)=m1;

+		*(htab_p-9)=m1;

+		*(htab_p-8)=m1;

+		*(htab_p-7)=m1;

+		*(htab_p-6)=m1;

+		*(htab_p-5)=m1;

+		*(htab_p-4)=m1;

+		*(htab_p-3)=m1;

+		*(htab_p-2)=m1;

+		*(htab_p-1)=m1;

+

+		htab_p-=16;

+	} while ((i-=16) >=0);

+

+	for (i+=16;i>0;--i)

+		*--htab_p=m1;

+}

+

+/*******************************************************************************

+*   GIF specific

+*******************************************************************************/

+

+void CxImageGIF::char_out(int32_t c)

+{

+	accum[a_count++]=(char)c;

+	if (a_count >=254)

+		flush_char();

+}

+

+void CxImageGIF::flush_char()

+{

+	if (a_count > 0) {

+		g_outfile->PutC((uint8_t)a_count);

+		g_outfile->Write(accum,1,a_count);

+		a_count=0;

+	}

+}

+

+/*******************************************************************************

+*   GIF decoder

+*******************************************************************************/

+/* DECODE.C - An LZW decoder for GIF

+ * Copyright (C) 1987, by Steven A. Bennett

+ * Copyright (C) 1994, C++ version by Alejandro Aguilar Sierra

+*

+ * Permission is given by the author to freely redistribute and include

+ * this code in any program as int32_t as this credit is given where due.

+ *

+ * In accordance with the above, I want to credit Steve Wilhite who wrote

+ * the code which this is heavily inspired by...

+ *

+ * GIF and 'Graphics Interchange Format' are trademarks (tm) of

+ * Compuserve, Incorporated, an H&R Block Company.

+ *

+ * Release Notes: This file contains a decoder routine for GIF images

+ * which is similar, structurally, to the original routine by Steve Wilhite.

+ * It is, however, somewhat noticably faster in most cases.

+ *

+ */

+

+////////////////////////////////////////////////////////////////////////////////

+

+int16_t CxImageGIF::init_exp(int16_t size)

+{

+	curr_size = (int16_t)(size + 1);

+	top_slot = (int16_t)(1 << curr_size);

+	clear = (int16_t)(1 << size);

+	ending = (int16_t)(clear + 1);

+	slot = newcodes = (int16_t)(ending + 1);

+	navail_bytes = nbits_left = 0;

+

+	memset(stack,0,MAX_CODES + 1);

+	memset(prefix,0,MAX_CODES + 1);

+	memset(suffix,0,MAX_CODES + 1);

+	return(0);

+}

+////////////////////////////////////////////////////////////////////////////////

+

+/* get_next_code()

+ * - gets the next code from the GIF file.  Returns the code, or else

+ * a negative number in case of file errors...

+ */

+int16_t CxImageGIF::get_next_code(CxFile* file)

+{

+	int16_t i, x;

+	uint32_t ret;

+

+	if (nbits_left == 0) {

+		if (navail_bytes <= 0) {

+			/* Out of bytes in current block, so read next block */

+			pbytes = byte_buff;

+			if ((navail_bytes = (int16_t)get_byte(file)) < 0)

+				return(navail_bytes);

+			else if (navail_bytes) {

+				for (i = 0; i < navail_bytes; ++i) {

+					if ((x = (int16_t)get_byte(file)) < 0) return(x);

+					byte_buff[i] = (uint8_t)x;

+				}

+			}

+		}

+		b1 = *pbytes++;

+		nbits_left = 8;

+		--navail_bytes;

+	}

+

+	if (navail_bytes<0) return ending; // prevent deadlocks (thanks to Mike Melnikov)

+

+	ret = b1 >> (8 - nbits_left);

+	while (curr_size > nbits_left){

+		if (navail_bytes <= 0){

+			/* Out of bytes in current block, so read next block*/

+			pbytes = byte_buff;

+			if ((navail_bytes = (int16_t)get_byte(file)) < 0)

+				return(navail_bytes);

+			else if (navail_bytes){

+				for (i = 0; i < navail_bytes; ++i){

+					if ((x = (int16_t)get_byte(file)) < 0) return(x);

+					byte_buff[i] = (uint8_t)x;

+				}

+			}

+		}

+		b1 = *pbytes++;

+		ret |= b1 << nbits_left;

+		nbits_left += 8;

+		--navail_bytes;

+	}

+	nbits_left = (int16_t)(nbits_left-curr_size);

+	ret &= code_mask[curr_size];

+	return((int16_t)(ret));

+}

+////////////////////////////////////////////////////////////////////////////////

+

+/* int16_t decoder(linewidth)

+ *    int16_t linewidth;               * Pixels per line of image *

+ *

+ * - This function decodes an LZW image, according to the method used

+ * in the GIF spec.  Every *linewidth* "characters" (ie. pixels) decoded

+ * will generate a call to out_line(), which is a user specific function

+ * to display a line of pixels.  The function gets it's codes from

+ * get_next_code() which is responsible for reading blocks of data and

+ * seperating them into the proper size codes.  Finally, get_byte() is

+ * the global routine to read the next uint8_t from the GIF file.

+ *

+ * It is generally a good idea to have linewidth correspond to the actual

+ * width of a line (as specified in the Image header) to make your own

+ * code a bit simpler, but it isn't absolutely necessary.

+ *

+ * Returns: 0 if successful, else negative.  (See ERRS.H)

+ *

+ */

+/* bad_code_count is incremented each time an out of range code is read.

+ * When this value is non-zero after a decode, your GIF file is probably

+ * corrupt in some way...

+ */

+int16_t CxImageGIF::decoder(CxFile* file, CImageIterator* iter, int16_t linewidth, int32_t &bad_code_count)

+{

+	register uint8_t *sp, *bufptr;

+	uint8_t *buf;

+	register int16_t code, fc, oc, bufcnt;

+	int16_t c, size, ret;

+

+	if (linewidth<=0)

+		return BAD_LINE_WIDTH;

+

+	/* Initialize for decoding a new image... */

+	bad_code_count = 0;

+	if ((size = (int16_t)get_byte(file)) < 0)	return(size);

+	if (size < 2 || 9 < size)				return(BAD_CODE_SIZE);

+	// out_line = outline;

+	init_exp(size);

+	//printf("L %d %x\n",linewidth,size);

+

+	/* Initialize in case they forgot to put in a clear code.

+	 * (This shouldn't happen, but we'll try and decode it anyway...)

+	 */

+	oc = fc = 0;

+

+   /* Allocate space for the decode buffer */

+	if ((buf = new uint8_t[linewidth + 1]) == NULL) return(OUT_OF_MEMORY);

+

+   /* Set up the stack pointer and decode buffer pointer */

+	sp = stack;

+	bufptr = buf;

+	bufcnt = linewidth;

+

+   /* This is the main loop.  For each code we get we pass through the

+	* linked list of prefix codes, pushing the corresponding "character" for

+	* each code onto the stack.  When the list reaches a single "character"

+	* we push that on the stack too, and then start unstacking each

+    * character for output in the correct order.  Special handling is

+	* included for the clear code, and the whole thing ends when we get

+    * an ending code.

+    */

+	while ((c = get_next_code(file)) != ending) {

+		/* If we had a file error, return without completing the decode*/

+		if (c < 0){

+			delete [] buf;

+			return(0);

+		}

+		/* If the code is a clear code, reinitialize all necessary items.*/

+		if (c == clear){

+			curr_size = (int16_t)(size + 1);

+			slot = newcodes;

+			top_slot = (int16_t)(1 << curr_size);

+

+			/* Continue reading codes until we get a non-clear code

+			* (Another unlikely, but possible case...)

+			*/

+			while ((c = get_next_code(file)) == clear);

+

+			/* If we get an ending code immediately after a clear code

+			* (Yet another unlikely case), then break out of the loop.

+			*/

+			if (c == ending) break;

+

+			/* Finally, if the code is beyond the range of already set codes,

+			* (This one had better NOT happen...  I have no idea what will

+			* result from this, but I doubt it will look good...) then set it

+			* to color zero.

+			*/

+			if (c >= slot) c = 0;

+			oc = fc = c;

+

+			/* And let us not forget to put the char into the buffer... And

+			* if, on the off chance, we were exactly one pixel from the end

+			* of the line, we have to send the buffer to the out_line()

+			* routine...

+			*/

+			*bufptr++ = (uint8_t)c;

+			if (--bufcnt == 0) {

+				if (iter) {

+					if ((ret = (int16_t)out_line(iter, buf, linewidth)) < 0) {

+						delete [] buf;

+						return(ret);

+					}

+				}

+				bufptr = buf;

+				bufcnt = linewidth;

+            }

+		} else {

+			/* In this case, it's not a clear code or an ending code, so

+			* it must be a code code...  So we can now decode the code into

+			* a stack of character codes. (Clear as mud, right?)

+			*/

+			code = c;

+

+			/* Here we go again with one of those off chances...  If, on the

+			* off chance, the code we got is beyond the range of those already

+			* set up (Another thing which had better NOT happen...) we trick

+			* the decoder into thinking it actually got the last code read.

+			* (Hmmn... I'm not sure why this works...  But it does...)

+			*/

+			if (code >= slot && sp<(stack+MAX_CODES-1)) {

+				if (code > slot)

+					++bad_code_count;

+				code = oc;

+				*sp++ = (uint8_t)fc;

+            }

+

+			/* Here we scan back along the linked list of prefixes, pushing

+			* helpless characters (ie. suffixes) onto the stack as we do so.

+			*/

+			while (code >= newcodes && sp<(stack+MAX_CODES-1)) {

+				*sp++ = suffix[code];

+				code = prefix[code];

+            }

+

+			/* Push the last character on the stack, and set up the new

+			* prefix and suffix, and if the required slot number is greater

+			* than that allowed by the current bit size, increase the bit

+			* size.  (NOTE - If we are all full, we *don't* save the new

+			* suffix and prefix...  I'm not certain if this is correct...

+			* it might be more proper to overwrite the last code...

+			*/

+			*sp++ = (uint8_t)code;

+			if (slot < top_slot){

+				suffix[slot] = (uint8_t)(fc = (uint8_t)code);

+				prefix[slot++] = oc;

+				oc = c;

+            }

+			if (slot >= top_slot){

+				if (curr_size < 12) {

+					top_slot <<= 1;

+					++curr_size;

+				}

+			}

+

+			/* Now that we've pushed the decoded string (in reverse order)

+			* onto the stack, lets pop it off and put it into our decode

+			* buffer...  And when the decode buffer is full, write another

+			* line...

+			*/

+			while (sp > stack) {

+				*bufptr++ = *(--sp);

+				if (--bufcnt == 0) {

+					if (iter) {

+						if ((ret = (int16_t)out_line(iter, buf, linewidth)) < 0) {

+							delete [] buf;

+							return(ret);

+						}

+					}

+					bufptr = buf;

+					bufcnt = linewidth;

+				}

+			}

+		}

+	}

+	ret = 0;

+	if (bufcnt != linewidth && iter)

+		ret = (int16_t)out_line(iter, buf, (linewidth - bufcnt));

+	delete [] buf;

+	return(ret);

+}

+////////////////////////////////////////////////////////////////////////////////

+int32_t CxImageGIF::get_num_frames(CxFile *fp,struct_TabCol* TabColSrc,struct_dscgif* dscgif)

+{

+	struct_image image;

+

+	int32_t pos=fp->Tell();

+	int32_t nframes=0;

+

+	struct_TabCol TempTabCol;

+	memcpy(&TempTabCol,TabColSrc,sizeof(struct_TabCol));

+

+	char ch;

+	bool bPreviousWasNull = true;

+

+	for (BOOL bContinue = TRUE; bContinue; )

+	{

+		if (fp->Read(&ch, sizeof(ch), 1) != 1) {break;}

+

+		if (bPreviousWasNull || ch==0)

+		{

+			switch (ch)

+			{

+			case '!': // extension

+				{

+				DecodeExtension(fp);

+				break;

+				}

+			case ',': // image

+				{

+

+				assert(sizeof(image) == 9);

+				//log << "Image header" << endl;

+				fp->Read(&image,sizeof(image),1);

+

+				//avoid byte order problems with Solaris <candan> <AMSN>

+				image.l = m_ntohs(image.l);

+				image.t = m_ntohs(image.t);

+				image.w = m_ntohs(image.w);

+				image.h = m_ntohs(image.h);

+

+				// in case of images with empty screen descriptor, give a last chance

+				if (dscgif->scrwidth==0 && dscgif->scrheight==0){

+					dscgif->scrwidth = image.w;

+					dscgif->scrheight = image.h;

+				}

+

+				if (((image.l + image.w) > dscgif->scrwidth)||((image.t + image.h) > dscgif->scrheight))

+					break;

+

+				nframes++;

+

+				// Local colour map?

+				if (image.pf & 0x80) {

+					TempTabCol.sogct = (int16_t)(1 << ((image.pf & 0x07) +1));

+					assert(3 == sizeof(struct rgb_color));

+					fp->Read(TempTabCol.paleta,sizeof(struct rgb_color)*TempTabCol.sogct,1);

+					//log << "Local colour map" << endl;

+				}

+

+				int32_t badcode=0;

+				ibf = GIFBUFTAM+1;

+

+				interlaced = image.pf & 0x40;

+				iheight = image.h;

+				istep = 8;

+				iypos = 0;

+				ipass = 0;

+

+				int32_t pos_start = fp->Tell();

+

+				//if (interlaced) log << "Interlaced" << endl;

+				decoder(fp, 0, image.w, badcode);

+

+				if (badcode){

+					seek_next_image(fp,pos_start);

+				} else {

+					fp->Seek(-(ibfmax - ibf - 1), SEEK_CUR);

+				}

+

+				break;

+				}

+			case ';': //terminator

+				bContinue=false;

+				break;

+			default:

+				bPreviousWasNull = (ch==0);

+				break;

+			}

+		}

+	}

+

+	fp->Seek(pos,SEEK_SET);

+	return nframes;

+}

+////////////////////////////////////////////////////////////////////////////////

+int32_t CxImageGIF::seek_next_image(CxFile* fp, int32_t position)

+{

+	fp->Seek(position, SEEK_SET);

+	char ch1,ch2;

+	ch1=ch2=0;

+	while(fp->Read(&ch2,sizeof(char),1)>0){

+		if (ch1 == 0 && ch2 == ','){

+			fp->Seek(-1,SEEK_CUR);

+			return fp->Tell();

+		} else {

+			ch1 = ch2;

+		}

+	}

+	return -1;

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::SetLoops(int32_t loops)

+{	m_loops=loops; }

+////////////////////////////////////////////////////////////////////////////////

+int32_t CxImageGIF::GetLoops()

+{	return m_loops; }

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::SetComment(const char* sz_comment_in)

+{	if (sz_comment_in) strncpy(m_comment,sz_comment_in,255); }

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::GetComment(char* sz_comment_out)

+{	if (sz_comment_out) strncpy(sz_comment_out,m_comment,255); }

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::GifMix(CxImage & imgsrc2, struct_image & imgdesc)

+{

+	int32_t ymin = max(0,(int32_t)(GetHeight()-imgdesc.t - imgdesc.h));

+	int32_t ymax = GetHeight()-imgdesc.t;

+	int32_t xmin = imgdesc.l;

+	int32_t xmax = min(GetWidth(), (uint32_t)(imgdesc.l + imgdesc.w));

+

+	int32_t ibg2= imgsrc2.GetTransIndex();

+    uint8_t i2;

+

+	for(int32_t y = ymin; y < ymax; y++){

+		for(int32_t x = xmin; x < xmax; x++){

+			i2 = imgsrc2.GetPixelIndex(x-xmin,y-ymin);

+			if(i2!=ibg2) SetPixelIndex(x,y,i2);

+		}

+	}

+}

+////////////////////////////////////////////////////////////////////////////////

+/*-----------------------------------------------------------------------

+ *

+ * miGIF Compression - mouse and ivo's GIF-compatible compression

+ *

+ *          -run length encoding compression routines-

+ *

+ * Copyright (C) 1998 Hutchison Avenue Software Corporation

+ *               http://www.hasc.com

+ *               info@hasc.com

+ *

+ * Permission to use, copy, modify, and distribute this software and its

+ * documentation for any purpose and without fee is hereby granted, provided

+ * that the above copyright notice appear in all copies and that both that

+ * copyright notice and this permission notice appear in supporting

+ * documentation.  This software is provided "AS IS." The Hutchison Avenue

+ * Software Corporation disclaims all warranties, either express or implied,

+ * including but not limited to implied warranties of merchantability and

+ * fitness for a particular purpose, with respect to this code and accompanying

+ * documentation.

+ *

+ * The miGIF compression routines do not, strictly speaking, generate files

+ * conforming to the GIF spec, since the image data is not LZW-compressed

+ * (this is the point: in order to avoid transgression of the Unisys patent

+ * on the LZW algorithm.)  However, miGIF generates data streams that any

+ * reasonably sane LZW decompresser will decompress to what we want.

+ *

+ * miGIF compression uses run length encoding. It compresses horizontal runs

+ * of pixels of the same color. This type of compression gives good results

+ * on images with many runs, for example images with lines, text and solid

+ * shapes on a solid-colored background. It gives little or no compression

+ * on images with few runs, for example digital or scanned photos.

+ *

+ *                               der Mouse

+ *                      mouse@rodents.montreal.qc.ca

+ *            7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B

+ *

+ *                             ivo@hasc.com

+ *

+ * The Graphics Interchange Format(c) is the Copyright property of

+ * CompuServe Incorporated.  GIF(sm) is a Service Mark property of

+ * CompuServe Incorporated.

+ *

+ */

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::rle_clear(struct_RLE* rle)

+{

+	rle->out_bits = rle->out_bits_init;

+	rle->out_bump = rle->out_bump_init;

+	rle->out_clear = rle->out_clear_init;

+	rle->out_count = 0;

+	rle->rl_table_max = 0;

+	rle->just_cleared = 1;

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::rle_flush(struct_RLE* rle)

+{

+	if (rle->rl_count == 1){

+		rle_output_plain(rle->rl_pixel,rle);

+		rle->rl_count = 0;

+		return;

+	}

+	if (rle->just_cleared){

+		rle_flush_fromclear(rle->rl_count,rle);

+	} else if ((rle->rl_table_max < 2) || (rle->rl_table_pixel != rle->rl_pixel)) {

+		rle_flush_clearorrep(rle->rl_count,rle);

+	} else {

+		rle_flush_withtable(rle->rl_count,rle);

+	}

+	rle->rl_count = 0;

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::rle_output_plain(int32_t c,struct_RLE* rle)

+{

+	rle->just_cleared = 0;

+	rle_output(c,rle);

+	rle->out_count++;

+	if (rle->out_count >= rle->out_bump){

+		rle->out_bits ++;

+		rle->out_bump += 1 << (rle->out_bits - 1);

+	}

+	if (rle->out_count >= rle->out_clear){

+		rle_output(rle->code_clear,rle);

+		rle_clear(rle);

+	}

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::rle_flush_fromclear(int32_t count,struct_RLE* rle)

+{

+	int32_t n;

+

+	rle->out_clear = rle->max_ocodes;

+	rle->rl_table_pixel = rle->rl_pixel;

+	n = 1;

+	while (count > 0){

+		if (n == 1){

+			rle->rl_table_max = 1;

+			rle_output_plain(rle->rl_pixel,rle);

+			count --;

+		} else if (count >= n){

+			rle->rl_table_max = n;

+			rle_output_plain(rle->rl_basecode+n-2,rle);

+			count -= n;

+		} else if (count == 1){

+			rle->rl_table_max ++;

+			rle_output_plain(rle->rl_pixel,rle);

+			count = 0;

+		} else {

+			rle->rl_table_max ++;

+			rle_output_plain(rle->rl_basecode+count-2,rle);

+			count = 0;

+		}

+		if (rle->out_count == 0) n = 1; else n ++;

+	}

+	rle_reset_out_clear(rle);

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::rle_reset_out_clear(struct_RLE* rle)

+{

+	rle->out_clear = rle->out_clear_init;

+	if (rle->out_count >= rle->out_clear){

+		rle_output(rle->code_clear,rle);

+		rle_clear(rle);

+	}

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::rle_flush_withtable(int32_t count, struct_RLE* rle)

+{

+	int32_t repmax;

+	int32_t repleft;

+	int32_t leftover;

+

+	repmax = count / rle->rl_table_max;

+	leftover = count % rle->rl_table_max;

+	repleft = (leftover ? 1 : 0);

+	if (rle->out_count+repmax+repleft > rle->max_ocodes){

+		repmax = rle->max_ocodes - rle->out_count;

+		leftover = count - (repmax * rle->rl_table_max);

+		repleft = 1 + rle_compute_triangle_count(leftover,rle->max_ocodes);

+	}

+	if (1+rle_compute_triangle_count(count,rle->max_ocodes) < (uint32_t)(repmax+repleft)){

+		rle_output(rle->code_clear,rle);

+		rle_clear(rle);

+		rle_flush_fromclear(count,rle);

+		return;

+	}

+	rle->out_clear = rle->max_ocodes;

+	for (;repmax>0;repmax--) rle_output_plain(rle->rl_basecode+rle->rl_table_max-2,rle);

+	if (leftover){

+		if (rle->just_cleared){

+			rle_flush_fromclear(leftover,rle);

+		} else if (leftover == 1){

+			rle_output_plain(rle->rl_pixel,rle);

+		} else {

+			rle_output_plain(rle->rl_basecode+leftover-2,rle);

+		}

+	}

+	rle_reset_out_clear(rle);

+}

+////////////////////////////////////////////////////////////////////////////////

+uint32_t CxImageGIF::rle_compute_triangle_count(uint32_t count, uint32_t nrepcodes)

+{

+	uint32_t perrep;

+	uint32_t cost;

+

+	cost = 0;

+	perrep = (nrepcodes * (nrepcodes+1)) / 2;

+	while (count >= perrep){

+		cost += nrepcodes;

+		count -= perrep;

+	}

+	if (count > 0){

+		uint32_t n;

+		n = rle_isqrt(count);

+		while ((n*(n+1)) >= 2*count) n --;

+		while ((n*(n+1)) < 2*count) n ++;

+		cost += n;

+	}

+	return(cost);

+}

+////////////////////////////////////////////////////////////////////////////////

+uint32_t CxImageGIF::rle_isqrt(uint32_t x)

+{

+	uint32_t r;

+	uint32_t v;

+

+	if (x < 2) return(x);

+	for (v=x,r=1;v;v>>=2,r<<=1) ;

+	for( ;; )

+	{

+		v = ((x / r) + r) / 2;

+		if ((v == r) || (v == r+1)) return(r);

+		r = v;

+	}

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::rle_flush_clearorrep(int32_t count, struct_RLE* rle)

+{

+	int32_t withclr;

+	withclr = 1 + rle_compute_triangle_count(count,rle->max_ocodes);

+	if (withclr < count) {

+		rle_output(rle->code_clear,rle);

+		rle_clear(rle);

+		rle_flush_fromclear(count,rle);

+	} else {

+		for (;count>0;count--) rle_output_plain(rle->rl_pixel,rle);

+	}

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::rle_write_block(struct_RLE* rle)

+{

+	g_outfile->PutC((uint8_t)rle->oblen);

+	g_outfile->Write(rle->oblock,1,rle->oblen);

+	rle->oblen = 0;

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::rle_block_out(uint8_t c, struct_RLE* rle)

+{

+	rle->oblock[rle->oblen++] = c;

+	if (rle->oblen >= 255) rle_write_block(rle);

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::rle_block_flush(struct_RLE* rle)

+{

+	if (rle->oblen > 0) rle_write_block(rle);

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::rle_output(int32_t val, struct_RLE* rle)

+{

+	rle->obuf |= val << rle->obits;

+	rle->obits += rle->out_bits;

+	while (rle->obits >= 8){

+		rle_block_out((uint8_t)(rle->obuf&0xff),rle);

+		rle->obuf >>= 8;

+		rle->obits -= 8;

+	}

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::rle_output_flush(struct_RLE* rle)

+{

+	 if (rle->obits > 0) rle_block_out((uint8_t)(rle->obuf),rle);

+	 rle_block_flush(rle);

+}

+////////////////////////////////////////////////////////////////////////////////

+void CxImageGIF::compressRLE( int32_t init_bits, CxFile* outfile)

+{

+	g_init_bits = init_bits;

+	g_outfile = outfile;

+

+	struct_RLE rle;

+	rle.code_clear = 1 << (init_bits - 1);

+	rle.code_eof = rle.code_clear + 1;

+	rle.rl_basecode = rle.code_eof + 1;

+	rle.out_bump_init = (1 << (init_bits - 1)) - 1;

+	rle.out_clear_init = (init_bits <= 3) ? 9 : (rle.out_bump_init-1);

+	rle.out_bits_init = init_bits;

+	rle.max_ocodes = (1 << MAXBITSCODES) - ((1 << (rle.out_bits_init - 1)) + 3);

+	rle.rl_count = 0;

+	rle_clear(&rle);

+	rle.obuf = 0;

+	rle.obits = 0;

+	rle.oblen = 0;

+

+	rle_output(rle.code_clear,&rle);

+

+	int32_t c;

+	for( ;; )

+	{

+		c = GifNextPixel();

+		if ((rle.rl_count > 0) && (c != rle.rl_pixel)) rle_flush(&rle);

+		if (c == EOF) break;

+		if (rle.rl_pixel == c){

+			rle.rl_count++;

+		} else {

+			rle.rl_pixel = c;

+			rle.rl_count = 1;

+		}

+	}

+	rle_output(rle.code_eof,&rle);

+	rle_output_flush(&rle);

+}

+////////////////////////////////////////////////////////////////////////////////

+#endif // CXIMAGE_SUPPORT_GIF