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-rw-r--r--src/gifenc.cpp288
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diff --git a/src/gifenc.cpp b/src/gifenc.cpp
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-/******************************************************************************
- *
- *
- *
- *
- * Copyright (C) 1997-2002 by Dimitri van Heesch.
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation under the terms of the GNU General Public License is hereby
- * granted. No representations are made about the suitability of this software
- * for any purpose. It is provided "as is" without express or implied warranty.
- * See the GNU General Public License for more details.
- *
- * Documents produced by Doxygen are derivative works derived from the
- * input used in their production; they are not affected by this license.
- *
- * The GIF compression code below is based on the file ppmtogif.c of the
- * netpbm package. The original copyright message follows:
- *
- * ---------------------------------------------------------------------------
- *
- * Copyright (C) 1989 by Jef Poskanzer.
- *
- * 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" without express or
- * implied warranty.
- *
- * ---------------------------------------------------------------------------
- *
- * The Graphics Interchange Format(c) is the Copyright property of
- * CompuServe Incorporated. GIF(sm) is a Service Mark property of
- * CompuServe Incorporated.
- */
-
-#include "gifenc.h"
-
-static const unsigned int masks[] = { 0x0000, 0x0001, 0x0003, 0x0007, 0x000F,
- 0x001F, 0x003F, 0x007F, 0x00FF,
- 0x01FF, 0x03FF, 0x07FF, 0x0FFF,
- 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF };
-
-GifEncoder::GifEncoder(Byte *rawBytes,Color *p,int w,int h, Byte d,
- int t)
- : colorResolution(8),globalPaletteFlag(0x80),bits(12),
- maxMaxCode(1<<bits)
-{
- width = w;
- height = h;
- depth = d;
- transIndex = t;
- palette = p;
- data = rawBytes;
- dataPtr = data;
-}
-
-GifEncoder::~GifEncoder()
-{
-}
-
-void GifEncoder::writeGIF(QFile &fp)
-{
- // Write the Magic header
- fp.writeBlock( transIndex < 0 ? "GIF87a" : "GIF89a", 6 );
-
- // Write the logical screen descriptor
- putWord( width, fp );
- putWord( height, fp );
- Byte pack = globalPaletteFlag | ((colorResolution-1)<<4) | (depth-1);
- putByte( pack, fp );
- putByte( 0, fp ); // the background color
- putByte( 0, fp ); // no aspect ration defined
-
- // Write global color table
- int i; for ( i=0 ; i< (1<<depth) ; i++)
- {
- putByte(palette[i].red, fp);
- putByte(palette[i].green,fp);
- putByte(palette[i].blue, fp);
- }
-
- if ( transIndex >= 0)
- {
- // Write graphic control extension (needed for GIF transparancy)
- putByte( 0x21, fp); // extension introducer
- putByte( 0xf9, fp); // graphic control label
- putByte( 4, fp); // block size
- putByte( 1, fp); // announce transparacy value
- putWord( 0, fp); // zero delay time
- putByte( transIndex, fp); // write transparant index
- putByte( 0, fp); // end block
- }
-
- // Write the image descriptor
- putByte( 0x2c, fp); // image separator
- putWord( 0, fp); // image left position
- putWord( 0, fp); // image top position
- putWord( width, fp); // image width
- putWord( height, fp); // image height
- putByte( 0, fp); // no local color table, no interlacing
-
- // Write table based image data
- Byte initCodeSize = depth<=1 ? 2 : depth;
- putByte( initCodeSize, fp); // LZW Minimum Code Size
- compress( initCodeSize+1, fp);
- putByte( 0, fp); // end of blocks
-
- // Write GIF Trailer
- putByte( 0x3b, fp);
-}
-
-void GifEncoder::compress( int ibits, QFile &outfile )
-{
- int i;
- int entry;
-
- initBits = ibits;
- numPixels = width*height;
- dataPtr = data;
- clearFlag = FALSE;
- nBits = initBits;
- maxCode = (1<<nBits) -1;
- ClearCode = (1 << (initBits - 1));
- EOFCode = ClearCode + 1;
- freeEntry = ClearCode + 2;
- aCount = 0;
- curAccum = 0;
- curBits = 0;
-
- entry = nextPixel();
-
- int hshift = 0;
- int fcode;
- for ( fcode = hashTableSize; fcode < 65536L; fcode *= 2L ) ++hshift;
- hshift = 8 - hshift; /* set hash code range bound */
-
- clearHashTable(); /* clear hash table */
-
- writeCode( ClearCode,outfile );
-
- int c;
- while ( (c = nextPixel()) != EOF )
- {
- fcode = (c << bits) + entry;
- i = (c << hshift) ^ entry; /* xor hashing */
-
- bool found=FALSE;
- if (htab[i]==fcode)
- {
- entry = codetab[i];
- found=TRUE;
- }
- else if (htab[i]>=0)
- {
- int disp = hashTableSize - i;
- if (i==0) disp=1;
- do
- {
- if ((i-=disp)<0) i+=hashTableSize;
- if (htab[i]==fcode)
- {
- entry=codetab[i];
- found=TRUE;
- }
- } while (htab[i]>0 && !found);
- }
- if (!found)
- {
- writeCode( entry, outfile );
- entry = c;
- if ( freeEntry < maxMaxCode )
- {
- codetab[i] = freeEntry++; /* code -> hashtable */
- htab[i] = fcode;
- }
- else
- {
- clearHashTable();
- freeEntry = ClearCode + 2;
- clearFlag = TRUE;
- writeCode( ClearCode, outfile );
- }
- }
- }
- writeCode( entry, outfile );
- writeCode( EOFCode, outfile );
-}
-
-void GifEncoder::putWord( Word w, QFile &fp )
-{
- fp.putch( w & 0xff );
- fp.putch( (w>>8) & 0xff );
-}
-
-void GifEncoder::putByte( Byte b, QFile &fp )
-{
- fp.putch( b );
-}
-
-void GifEncoder::writeCode( int code, QFile &outfile )
-{
- curAccum &= masks[ curBits ];
-
- if ( curBits > 0 )
- {
- curAccum |= (code << curBits);
- }
- else
- {
- curAccum = code;
- }
-
- curBits += nBits;
-
- while( curBits >= 8 )
- {
- writeChar( (Byte)(curAccum & 0xff),outfile );
- curAccum >>= 8;
- curBits -= 8;
- }
-
- /*
- * If the next entry is going to be too big for the code size,
- * then increase it, if possible.
- */
- if ( freeEntry > maxCode || clearFlag )
- {
- if( clearFlag )
- {
- nBits = initBits;
- maxCode = (1<<nBits)-1;
- clearFlag = FALSE;
- }
- else
- {
- ++nBits;
- if ( nBits == bits )
- maxCode = maxMaxCode;
- else
- maxCode = (1<<nBits)-1;
- }
- }
-
- if ( code == EOFCode )
- {
- /* At EOF, write the rest of the buffer. */
- while( curBits > 0 )
- {
- writeChar( (Byte)(curAccum & 0xff), outfile );
- curAccum >>= 8;
- curBits -= 8;
- }
-
- writePacket(outfile);
- }
-}
-
-/*
- * Add a character to the end of the current packet, and if it is 254
- * characters, flush the packet to disk.
- */
-void GifEncoder::writeChar( Byte c, QFile &fp )
-{
- accum[ aCount++ ] = c;
- if( aCount >= 254 ) writePacket(fp);
-}
-
-/*
- * Flush the packet to disk, and reset the accumulator
- */
-void GifEncoder::writePacket(QFile &fp)
-{
- if ( aCount > 0 )
- {
- fp.putch( aCount );
- fp.writeBlock( (const char *)accum, aCount );
- aCount = 0;
- }
-}
-
-void GifEncoder::clearHashTable() /* reset code table */
-{
- int *htab_p = htab;
- int i; for (i=0;i<hashTableSize;i++) *htab_p++ = -1;
-}
-
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