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-rw-r--r--ext/gd/libgd/gd_gif_out.c759
1 files changed, 0 insertions, 759 deletions
diff --git a/ext/gd/libgd/gd_gif_out.c b/ext/gd/libgd/gd_gif_out.c
deleted file mode 100644
index 49da75f96f..0000000000
--- a/ext/gd/libgd/gd_gif_out.c
+++ /dev/null
@@ -1,759 +0,0 @@
-#include <stdio.h>
-#include <math.h>
-#include <string.h>
-#include <stdlib.h>
-#include "gd.h"
-
-/* Code drawn from ppmtogif.c, from the pbmplus package
-**
-** Based on GIFENCOD by David Rowley <mgardi@watdscu.waterloo.edu>. A
-** Lempel-Zim compression based on "compress".
-**
-** Modified by Marcel Wijkstra <wijkstra@fwi.uva.nl>
-**
-** 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.
-*/
-
-/*
- * a code_int must be able to hold 2**GIFBITS values of type int, and also -1
- */
-typedef int code_int;
-
-#ifdef SIGNED_COMPARE_SLOW
-typedef unsigned long int count_int;
-typedef unsigned short int count_short;
-#else /*SIGNED_COMPARE_SLOW*/
-typedef long int count_int;
-#endif /*SIGNED_COMPARE_SLOW*/
-
-/* 2.0.28: threadsafe */
-
-#define maxbits GIFBITS
-
-/* should NEVER generate this code */
-#define maxmaxcode ((code_int)1 << GIFBITS)
-
-#define HSIZE 5003 /* 80% occupancy */
-#define hsize HSIZE /* Apparently invariant, left over from
- compress */
-
-typedef struct {
- int Width, Height;
- int curx, cury;
- long CountDown;
- int Pass;
- int Interlace;
- int n_bits; /* number of bits/code */
- code_int maxcode; /* maximum code, given n_bits */
- count_int htab [HSIZE];
- unsigned short codetab [HSIZE];
- code_int free_ent; /* first unused entry */
- /*
- * block compression parameters -- after all codes are used up,
- * and compression rate changes, start over.
- */
- int clear_flg;
- int offset;
- long int in_count; /* length of input */
- long int out_count; /* # of codes output (for debugging) */
-
- int g_init_bits;
- gdIOCtx * g_outfile;
-
- int ClearCode;
- int EOFCode;
- unsigned long cur_accum;
- int cur_bits;
- /*
- * Number of characters so far in this 'packet'
- */
- int a_count;
- /*
- * Define the storage for the packet accumulator
- */
- char accum[ 256 ];
-} GifCtx;
-
-static int gifPutWord(int w, gdIOCtx *out);
-static int colorstobpp(int colors);
-static void BumpPixel (GifCtx *ctx);
-static int GIFNextPixel (gdImagePtr im, GifCtx *ctx);
-static void GIFEncode (gdIOCtxPtr fp, int GWidth, int GHeight, int GInterlace, int Background, int Transparent, int BitsPerPixel, int *Red, int *Green, int *Blue, gdImagePtr im);
-static void compress (int init_bits, gdIOCtx *outfile, gdImagePtr im, GifCtx *ctx);
-static void output (code_int code, GifCtx *ctx);
-static void cl_block (GifCtx *ctx);
-static void cl_hash (register count_int chsize, GifCtx *ctx);
-static void char_init (GifCtx *ctx);
-static void char_out (int c, GifCtx *ctx);
-static void flush_char (GifCtx *ctx);
-void * gdImageGifPtr (gdImagePtr im, int *size)
-{
- void *rv;
- gdIOCtx *out = gdNewDynamicCtx (2048, NULL);
- gdImageGifCtx (im, out);
- rv = gdDPExtractData (out, size);
- out->gd_free (out);
- return rv;
-}
-
-void gdImageGif (gdImagePtr im, FILE * outFile)
-{
- gdIOCtx *out = gdNewFileCtx (outFile);
- gdImageGifCtx (im, out);
- out->gd_free (out);
-}
-
-void gdImageGifCtx(gdImagePtr im, gdIOCtxPtr out)
-{
- gdImagePtr pim = 0, tim = im;
- int interlace, transparent, BitsPerPixel;
- interlace = im->interlace;
- transparent = im->transparent;
- if (im->trueColor) {
- /* Expensive, but the only way that produces an
- acceptable result: mix down to a palette
- based temporary image. */
- pim = gdImageCreatePaletteFromTrueColor(im, 1, 256);
- if (!pim) {
- return;
- }
- tim = pim;
- }
- BitsPerPixel = colorstobpp(tim->colorsTotal);
- /* All set, let's do it. */
- GIFEncode(
- out, tim->sx, tim->sy, interlace, 0, transparent, BitsPerPixel,
- tim->red, tim->green, tim->blue, tim);
- if (pim) {
- /* Destroy palette based temporary image. */
- gdImageDestroy( pim);
- }
-}
-
-static int
-colorstobpp(int colors)
-{
- int bpp = 0;
-
- if ( colors <= 2 )
- bpp = 1;
- else if ( colors <= 4 )
- bpp = 2;
- else if ( colors <= 8 )
- bpp = 3;
- else if ( colors <= 16 )
- bpp = 4;
- else if ( colors <= 32 )
- bpp = 5;
- else if ( colors <= 64 )
- bpp = 6;
- else if ( colors <= 128 )
- bpp = 7;
- else if ( colors <= 256 )
- bpp = 8;
- return bpp;
- }
-
-/*****************************************************************************
- *
- * GIFENCODE.C - GIF Image compression interface
- *
- * GIFEncode( FName, GHeight, GWidth, GInterlace, Background, Transparent,
- * BitsPerPixel, Red, Green, Blue, gdImagePtr )
- *
- *****************************************************************************/
-
-#define TRUE 1
-#define FALSE 0
-/*
- * Bump the 'curx' and 'cury' to point to the next pixel
- */
-static void
-BumpPixel(GifCtx *ctx)
-{
- /*
- * Bump the current X position
- */
- ++(ctx->curx);
-
- /*
- * If we are at the end of a scan line, set curx back to the beginning
- * If we are interlaced, bump the cury to the appropriate spot,
- * otherwise, just increment it.
- */
- if( ctx->curx == ctx->Width ) {
- ctx->curx = 0;
-
- if( !ctx->Interlace )
- ++(ctx->cury);
- else {
- switch( ctx->Pass ) {
-
- case 0:
- ctx->cury += 8;
- if( ctx->cury >= ctx->Height ) {
- ++(ctx->Pass);
- ctx->cury = 4;
- }
- break;
-
- case 1:
- ctx->cury += 8;
- if( ctx->cury >= ctx->Height ) {
- ++(ctx->Pass);
- ctx->cury = 2;
- }
- break;
-
- case 2:
- ctx->cury += 4;
- if( ctx->cury >= ctx->Height ) {
- ++(ctx->Pass);
- ctx->cury = 1;
- }
- break;
-
- case 3:
- ctx->cury += 2;
- break;
- }
- }
- }
-}
-
-/*
- * Return the next pixel from the image
- */
-static int
-GIFNextPixel(gdImagePtr im, GifCtx *ctx)
-{
- int r;
-
- if( ctx->CountDown == 0 )
- return EOF;
-
- --(ctx->CountDown);
-
- r = gdImageGetPixel(im, ctx->curx, ctx->cury);
-
- BumpPixel(ctx);
-
- return r;
-}
-
-/* public */
-
-static void
-GIFEncode(gdIOCtxPtr fp, int GWidth, int GHeight, int GInterlace, int Background, int Transparent, int BitsPerPixel, int *Red, int *Green, int *Blue, gdImagePtr im)
-{
- int B;
- int RWidth, RHeight;
- int LeftOfs, TopOfs;
- int Resolution;
- int ColorMapSize;
- int InitCodeSize;
- int i;
- GifCtx ctx;
- ctx.Interlace = GInterlace;
- ctx.in_count = 1;
- memset(&ctx, 0, sizeof(ctx));
- ColorMapSize = 1 << BitsPerPixel;
-
- RWidth = ctx.Width = GWidth;
- RHeight = ctx.Height = GHeight;
- LeftOfs = TopOfs = 0;
-
- Resolution = BitsPerPixel;
-
- /*
- * Calculate number of bits we are expecting
- */
- ctx.CountDown = (long)ctx.Width * (long)ctx.Height;
-
- /*
- * Indicate which pass we are on (if interlace)
- */
- ctx.Pass = 0;
-
- /*
- * The initial code size
- */
- if( BitsPerPixel <= 1 )
- InitCodeSize = 2;
- else
- InitCodeSize = BitsPerPixel;
-
- /*
- * Set up the current x and y position
- */
- ctx.curx = ctx.cury = 0;
-
- /*
- * Write the Magic header
- */
- gdPutBuf(Transparent < 0 ? "GIF87a" : "GIF89a", 6, fp );
-
- /*
- * Write out the screen width and height
- */
- gifPutWord( RWidth, fp );
- gifPutWord( RHeight, fp );
-
- /*
- * Indicate that there is a global colour map
- */
- B = 0x80; /* Yes, there is a color map */
-
- /*
- * OR in the resolution
- */
- B |= (Resolution - 1) << 5;
-
- /*
- * OR in the Bits per Pixel
- */
- B |= (BitsPerPixel - 1);
-
- /*
- * Write it out
- */
- gdPutC( B, fp );
-
- /*
- * Write out the Background colour
- */
- gdPutC( Background, fp );
-
- /*
- * Byte of 0's (future expansion)
- */
- gdPutC( 0, fp );
-
- /*
- * Write out the Global Colour Map
- */
- for( i=0; i<ColorMapSize; ++i ) {
- gdPutC( Red[i], fp );
- gdPutC( Green[i], fp );
- gdPutC( Blue[i], fp );
- }
-
- /*
- * Write out extension for transparent colour index, if necessary.
- */
- if ( Transparent >= 0 ) {
- gdPutC( '!', fp );
- gdPutC( 0xf9, fp );
- gdPutC( 4, fp );
- gdPutC( 1, fp );
- gdPutC( 0, fp );
- gdPutC( 0, fp );
- gdPutC( (unsigned char) Transparent, fp );
- gdPutC( 0, fp );
- }
-
- /*
- * Write an Image separator
- */
- gdPutC( ',', fp );
-
- /*
- * Write the Image header
- */
-
- gifPutWord( LeftOfs, fp );
- gifPutWord( TopOfs, fp );
- gifPutWord( ctx.Width, fp );
- gifPutWord( ctx.Height, fp );
-
- /*
- * Write out whether or not the image is interlaced
- */
- if( ctx.Interlace )
- gdPutC( 0x40, fp );
- else
- gdPutC( 0x00, fp );
-
- /*
- * Write out the initial code size
- */
- gdPutC( InitCodeSize, fp );
-
- /*
- * Go and actually compress the data
- */
- compress( InitCodeSize+1, fp, im, &ctx );
-
- /*
- * Write out a Zero-length packet (to end the series)
- */
- gdPutC( 0, fp );
-
- /*
- * Write the GIF file terminator
- */
- gdPutC( ';', fp );
-}
-
-/***************************************************************************
- *
- * GIFCOMPR.C - GIF Image compression routines
- *
- * Lempel-Ziv compression based on 'compress'. GIF modifications by
- * David Rowley (mgardi@watdcsu.waterloo.edu)
- *
- ***************************************************************************/
-
-/*
- * General DEFINEs
- */
-
-#define GIFBITS 12
-
-#ifdef NO_UCHAR
- typedef char char_type;
-#else /*NO_UCHAR*/
- typedef unsigned char char_type;
-#endif /*NO_UCHAR*/
-
-/*
- *
- * GIF Image compression - modified 'compress'
- *
- * Based on: compress.c - File compression ala IEEE Computer, June 1984.
- *
- * By Authors: Spencer W. Thomas (decvax!harpo!utah-cs!utah-gr!thomas)
- * Jim McKie (decvax!mcvax!jim)
- * Steve Davies (decvax!vax135!petsd!peora!srd)
- * Ken Turkowski (decvax!decwrl!turtlevax!ken)
- * James A. Woods (decvax!ihnp4!ames!jaw)
- * Joe Orost (decvax!vax135!petsd!joe)
- *
- */
-#include <ctype.h>
-
-#define ARGVAL() (*++(*argv) || (--argc && *++argv))
-
-#ifdef COMPATIBLE /* But wrong! */
-# define MAXCODE(n_bits) ((code_int) 1 << (n_bits) - 1)
-#else /*COMPATIBLE*/
-# define MAXCODE(n_bits) (((code_int) 1 << (n_bits)) - 1)
-#endif /*COMPATIBLE*/
-
-#define HashTabOf(i) ctx->htab[i]
-#define CodeTabOf(i) ctx->codetab[i]
-
-
-/*
- * To save much memory, we overlay the table used by compress() with those
- * used by decompress(). The tab_prefix table is the same size and type
- * as the codetab. The tab_suffix table needs 2**GIFBITS characters. We
- * get this from the beginning of htab. The output stack uses the rest
- * of htab, and contains characters. There is plenty of room for any
- * possible stack (stack used to be 8000 characters).
- */
-
-#define tab_prefixof(i) CodeTabOf(i)
-#define tab_suffixof(i) ((char_type*)(htab))[i]
-#define de_stack ((char_type*)&tab_suffixof((code_int)1<<GIFBITS))
-
-/*
- * compress stdin to stdout
- *
- * Algorithm: use open addressing double hashing (no chaining) on the
- * prefix code / next character combination. We do a variant of Knuth's
- * algorithm D (vol. 3, sec. 6.4) along with G. Knott's relatively-prime
- * secondary probe. Here, the modular division first probe is gives way
- * to a faster exclusive-or manipulation. Also do block compression with
- * an adaptive reset, whereby the code table is cleared when the compression
- * ratio decreases, but after the table fills. The variable-length output
- * codes are re-sized at this point, and a special CLEAR code is generated
- * for the decompressor. Late addition: construct the table according to
- * file size for noticeable speed improvement on small files. Please direct
- * questions about this implementation to ames!jaw.
- */
-
-static void
-output(code_int code, GifCtx *ctx);
-
-static void
-compress(int init_bits, gdIOCtxPtr outfile, gdImagePtr im, GifCtx *ctx)
-{
- register long fcode;
- register code_int i /* = 0 */;
- register int c;
- register code_int ent;
- register code_int disp;
- register code_int hsize_reg;
- register int hshift;
-
- /*
- * Set up the globals: g_init_bits - initial number of bits
- * g_outfile - pointer to output file
- */
- ctx->g_init_bits = init_bits;
- ctx->g_outfile = outfile;
-
- /*
- * Set up the necessary values
- */
- ctx->offset = 0;
- ctx->out_count = 0;
- ctx->clear_flg = 0;
- ctx->in_count = 1;
- ctx->maxcode = MAXCODE(ctx->n_bits = ctx->g_init_bits);
-
- ctx->ClearCode = (1 << (init_bits - 1));
- ctx->EOFCode = ctx->ClearCode + 1;
- ctx->free_ent = ctx->ClearCode + 2;
-
- char_init(ctx);
-
- ent = GIFNextPixel( im, ctx );
-
- hshift = 0;
- for ( fcode = (long) hsize; fcode < 65536L; fcode *= 2L )
- ++hshift;
- hshift = 8 - hshift; /* set hash code range bound */
-
- hsize_reg = hsize;
- cl_hash( (count_int) hsize_reg, ctx ); /* clear hash table */
-
- output( (code_int)ctx->ClearCode, ctx );
-
-#ifdef SIGNED_COMPARE_SLOW
- while ( (c = GIFNextPixel( im )) != (unsigned) EOF ) {
-#else /*SIGNED_COMPARE_SLOW*/
- while ( (c = GIFNextPixel( im, ctx )) != EOF ) { /* } */
-#endif /*SIGNED_COMPARE_SLOW*/
-
- ++(ctx->in_count);
-
- fcode = (long) (((long) c << maxbits) + ent);
- i = (((code_int)c << hshift) ^ ent); /* xor hashing */
-
- if ( HashTabOf (i) == fcode ) {
- ent = CodeTabOf (i);
- continue;
- } else if ( (long)HashTabOf (i) < 0 ) /* empty slot */
- goto nomatch;
- disp = hsize_reg - i; /* secondary hash (after G. Knott) */
- if ( i == 0 )
- disp = 1;
-probe:
- if ( (i -= disp) < 0 )
- i += hsize_reg;
-
- if ( HashTabOf (i) == fcode ) {
- ent = CodeTabOf (i);
- continue;
- }
- if ( (long)HashTabOf (i) > 0 )
- goto probe;
-nomatch:
- output ( (code_int) ent, ctx );
- ++(ctx->out_count);
- ent = c;
-#ifdef SIGNED_COMPARE_SLOW
- if ( (unsigned) ctx->free_ent < (unsigned) maxmaxcode) {
-#else /*SIGNED_COMPARE_SLOW*/
- if ( ctx->free_ent < maxmaxcode ) { /* } */
-#endif /*SIGNED_COMPARE_SLOW*/
- CodeTabOf (i) = ctx->free_ent++; /* code -> hashtable */
- HashTabOf (i) = fcode;
- } else
- cl_block(ctx);
- }
- /*
- * Put out the final code.
- */
- output( (code_int)ent, ctx );
- ++(ctx->out_count);
- output( (code_int) ctx->EOFCode, ctx );
-}
-
-/*****************************************************************
- * TAG( output )
- *
- * Output the given code.
- * Inputs:
- * code: A n_bits-bit integer. If == -1, then EOF. This assumes
- * that n_bits =< (long)wordsize - 1.
- * Outputs:
- * Outputs code to the file.
- * Assumptions:
- * Chars are 8 bits long.
- * Algorithm:
- * Maintain a GIFBITS character long buffer (so that 8 codes will
- * fit in it exactly). Use the VAX insv instruction to insert each
- * code in turn. When the buffer fills up empty it and start over.
- */
-
-static unsigned long masks[] = { 0x0000, 0x0001, 0x0003, 0x0007, 0x000F,
- 0x001F, 0x003F, 0x007F, 0x00FF,
- 0x01FF, 0x03FF, 0x07FF, 0x0FFF,
- 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF };
-
-static void
-output(code_int code, GifCtx *ctx)
-{
- ctx->cur_accum &= masks[ ctx->cur_bits ];
-
- if( ctx->cur_bits > 0 )
- ctx->cur_accum |= ((long)code << ctx->cur_bits);
- else
- ctx->cur_accum = code;
-
- ctx->cur_bits += ctx->n_bits;
-
- while( ctx->cur_bits >= 8 ) {
- char_out( (unsigned int)(ctx->cur_accum & 0xff), ctx );
- ctx->cur_accum >>= 8;
- ctx->cur_bits -= 8;
- }
-
- /*
- * If the next entry is going to be too big for the code size,
- * then increase it, if possible.
- */
- if ( ctx->free_ent > ctx->maxcode || ctx->clear_flg ) {
-
- if( ctx->clear_flg ) {
-
- ctx->maxcode = MAXCODE (ctx->n_bits = ctx->g_init_bits);
- ctx->clear_flg = 0;
-
- } else {
-
- ++(ctx->n_bits);
- if ( ctx->n_bits == maxbits )
- ctx->maxcode = maxmaxcode;
- else
- ctx->maxcode = MAXCODE(ctx->n_bits);
- }
- }
-
- if( code == ctx->EOFCode ) {
- /*
- * At EOF, write the rest of the buffer.
- */
- while( ctx->cur_bits > 0 ) {
- char_out( (unsigned int)(ctx->cur_accum & 0xff), ctx);
- ctx->cur_accum >>= 8;
- ctx->cur_bits -= 8;
- }
-
- flush_char(ctx);
-
- }
-}
-
-/*
- * Clear out the hash table
- */
-static void
-cl_block (GifCtx *ctx) /* table clear for block compress */
-{
-
- cl_hash ( (count_int) hsize, ctx );
- ctx->free_ent = ctx->ClearCode + 2;
- ctx->clear_flg = 1;
-
- output( (code_int)ctx->ClearCode, ctx);
-}
-
-static void
-cl_hash(register count_int chsize, GifCtx *ctx) /* reset code table */
-
-{
-
- register count_int *htab_p = ctx->htab+chsize;
-
- register long i;
- register long m1 = -1;
-
- i = chsize - 16;
- do { /* might use Sys V memset(3) here */
- *(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 routines
- *
- ******************************************************************************/
-
-/*
- * Set up the 'byte output' routine
- */
-static void
-char_init(GifCtx *ctx)
-{
- ctx->a_count = 0;
-}
-
-/*
- * Add a character to the end of the current packet, and if it is 254
- * characters, flush the packet to disk.
- */
-static void
-char_out(int c, GifCtx *ctx)
-{
- ctx->accum[ ctx->a_count++ ] = c;
- if( ctx->a_count >= 254 )
- flush_char(ctx);
-}
-
-/*
- * Flush the packet to disk, and reset the accumulator
- */
-static void
-flush_char(GifCtx *ctx)
-{
- if( ctx->a_count > 0 ) {
- gdPutC( ctx->a_count, ctx->g_outfile );
- gdPutBuf( ctx->accum, ctx->a_count, ctx->g_outfile );
- ctx->a_count = 0;
- }
-}
-
-static int gifPutWord(int w, gdIOCtx *out)
-{
- /* Byte order is little-endian */
- gdPutC(w & 0xFF, out);
- gdPutC((w >> 8) & 0xFF, out);
- return 0;
-}
-
-
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