Imported Upstream version 1.7.0upstream/1.7.0

1 files changed, 0 insertions, 399 deletions

diff --git a/jpg/wrgif.c b/jpg/wrgif.c
deleted file mode 100644
index 5fe8328..0000000
--- a/jpg/wrgif.c
+++ /dev/null
@@ -1,399 +0,0 @@
-/*
- * wrgif.c
- *
- * Copyright (C) 1991-1997, Thomas G. Lane.
- * This file is part of the Independent JPEG Group's software.
- * For conditions of distribution and use, see the accompanying README file.
- *
- * This file contains routines to write output images in GIF format.
- *
- **************************************************************************
- * NOTE: to avoid entanglements with Unisys' patent on LZW compression,   *
- * this code has been modified to output "uncompressed GIF" files.        *
- * There is no trace of the LZW algorithm in this file.                   *
- **************************************************************************
- *
- * These routines may need modification for non-Unix environments or
- * specialized applications.  As they stand, they assume output to
- * an ordinary stdio stream.
- */
-
-/*
- * This code is loosely based on ppmtogif from the PBMPLUS distribution
- * of Feb. 1991.  That file contains the following copyright notice:
- *    Based on GIFENCODE by David Rowley <mgardi@watdscu.waterloo.edu>.
- *    Lempel-Ziv compression based on "compress" by Spencer W. Thomas et al.
- *    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.
- *
- * We are also required to state that
- *    "The Graphics Interchange Format(c) is the Copyright property of
- *    CompuServe Incorporated. GIF(sm) is a Service Mark property of
- *    CompuServe Incorporated."
- */
-
-#include "cdjpeg.h"		/* Common decls for cjpeg/djpeg applications */
-
-#ifdef GIF_SUPPORTED
-
-
-/* Private version of data destination object */
-
-typedef struct {
-  struct djpeg_dest_struct pub;	/* public fields */
-
-  j_decompress_ptr cinfo;	/* back link saves passing separate parm */
-
-  /* State for packing variable-width codes into a bitstream */
-  int n_bits;			/* current number of bits/code */
-  int maxcode;			/* maximum code, given n_bits */
-  INT32 cur_accum;		/* holds bits not yet output */
-  int cur_bits;			/* # of bits in cur_accum */
-
-  /* State for GIF code assignment */
-  int ClearCode;		/* clear code (doesn't change) */
-  int EOFCode;			/* EOF code (ditto) */
-  int code_counter;		/* counts output symbols */
-
-  /* GIF data packet construction buffer */
-  int bytesinpkt;		/* # of bytes in current packet */
-  char packetbuf[256];		/* workspace for accumulating packet */
-
-} gif_dest_struct;
-
-typedef gif_dest_struct * gif_dest_ptr;
-
-/* Largest value that will fit in N bits */
-#define MAXCODE(n_bits)	((1 << (n_bits)) - 1)
-
-
-/*
- * Routines to package finished data bytes into GIF data blocks.
- * A data block consists of a count byte (1..255) and that many data bytes.
- */
-
-LOCAL(void)
-flush_packet (gif_dest_ptr dinfo)
-/* flush any accumulated data */
-{
-  if (dinfo->bytesinpkt > 0) {	/* never write zero-length packet */
-    dinfo->packetbuf[0] = (char) dinfo->bytesinpkt++;
-    if (JFWRITE(dinfo->pub.output_file, dinfo->packetbuf, dinfo->bytesinpkt)
-	!= (size_t) dinfo->bytesinpkt)
-      ERREXIT(dinfo->cinfo, JERR_FILE_WRITE);
-    dinfo->bytesinpkt = 0;
-  }
-}
-
-
-/* Add a character to current packet; flush to disk if necessary */
-#define CHAR_OUT(dinfo,c)  \
-	{ (dinfo)->packetbuf[++(dinfo)->bytesinpkt] = (char) (c);  \
-	    if ((dinfo)->bytesinpkt >= 255)  \
-	      flush_packet(dinfo);  \
-	}
-
-
-/* Routine to convert variable-width codes into a byte stream */
-
-LOCAL(void)
-output (gif_dest_ptr dinfo, int code)
-/* Emit a code of n_bits bits */
-/* Uses cur_accum and cur_bits to reblock into 8-bit bytes */
-{
-  dinfo->cur_accum |= ((INT32) code) << dinfo->cur_bits;
-  dinfo->cur_bits += dinfo->n_bits;
-
-  while (dinfo->cur_bits >= 8) {
-    CHAR_OUT(dinfo, dinfo->cur_accum & 0xFF);
-    dinfo->cur_accum >>= 8;
-    dinfo->cur_bits -= 8;
-  }
-}
-
-
-/* The pseudo-compression algorithm.
- *
- * In this module we simply output each pixel value as a separate symbol;
- * thus, no compression occurs.  In fact, there is expansion of one bit per
- * pixel, because we use a symbol width one bit wider than the pixel width.
- *
- * GIF ordinarily uses variable-width symbols, and the decoder will expect
- * to ratchet up the symbol width after a fixed number of symbols.
- * To simplify the logic and keep the expansion penalty down, we emit a
- * GIF Clear code to reset the decoder just before the width would ratchet up.
- * Thus, all the symbols in the output file will have the same bit width.
- * Note that emitting the Clear codes at the right times is a mere matter of
- * counting output symbols and is in no way dependent on the LZW patent.
- *
- * With a small basic pixel width (low color count), Clear codes will be
- * needed very frequently, causing the file to expand even more.  So this
- * simplistic approach wouldn't work too well on bilevel images, for example.
- * But for output of JPEG conversions the pixel width will usually be 8 bits
- * (129 to 256 colors), so the overhead added by Clear symbols is only about
- * one symbol in every 256.
- */
-
-LOCAL(void)
-compress_init (gif_dest_ptr dinfo, int i_bits)
-/* Initialize pseudo-compressor */
-{
-  /* init all the state variables */
-  dinfo->n_bits = i_bits;
-  dinfo->maxcode = MAXCODE(dinfo->n_bits);
-  dinfo->ClearCode = (1 << (i_bits - 1));
-  dinfo->EOFCode = dinfo->ClearCode + 1;
-  dinfo->code_counter = dinfo->ClearCode + 2;
-  /* init output buffering vars */
-  dinfo->bytesinpkt = 0;
-  dinfo->cur_accum = 0;
-  dinfo->cur_bits = 0;
-  /* GIF specifies an initial Clear code */
-  output(dinfo, dinfo->ClearCode);
-}
-
-
-LOCAL(void)
-compress_pixel (gif_dest_ptr dinfo, int c)
-/* Accept and "compress" one pixel value.
- * The given value must be less than n_bits wide.
- */
-{
-  /* Output the given pixel value as a symbol. */
-  output(dinfo, c);
-  /* Issue Clear codes often enough to keep the reader from ratcheting up
-   * its symbol size.
-   */
-  if (dinfo->code_counter < dinfo->maxcode) {
-    dinfo->code_counter++;
-  } else {
-    output(dinfo, dinfo->ClearCode);
-    dinfo->code_counter = dinfo->ClearCode + 2;	/* reset the counter */
-  }
-}
-
-
-LOCAL(void)
-compress_term (gif_dest_ptr dinfo)
-/* Clean up at end */
-{
-  /* Send an EOF code */
-  output(dinfo, dinfo->EOFCode);
-  /* Flush the bit-packing buffer */
-  if (dinfo->cur_bits > 0) {
-    CHAR_OUT(dinfo, dinfo->cur_accum & 0xFF);
-  }
-  /* Flush the packet buffer */
-  flush_packet(dinfo);
-}
-
-
-/* GIF header construction */
-
-
-LOCAL(void)
-put_word (gif_dest_ptr dinfo, unsigned int w)
-/* Emit a 16-bit word, LSB first */
-{
-  putc(w & 0xFF, dinfo->pub.output_file);
-  putc((w >> 8) & 0xFF, dinfo->pub.output_file);
-}
-
-
-LOCAL(void)
-put_3bytes (gif_dest_ptr dinfo, int val)
-/* Emit 3 copies of same byte value --- handy subr for colormap construction */
-{
-  putc(val, dinfo->pub.output_file);
-  putc(val, dinfo->pub.output_file);
-  putc(val, dinfo->pub.output_file);
-}
-
-
-LOCAL(void)
-emit_header (gif_dest_ptr dinfo, int num_colors, JSAMPARRAY colormap)
-/* Output the GIF file header, including color map */
-/* If colormap==NULL, synthesize a gray-scale colormap */
-{
-  int BitsPerPixel, ColorMapSize, InitCodeSize, FlagByte;
-  int cshift = dinfo->cinfo->data_precision - 8;
-  int i;
-
-  if (num_colors > 256)
-    ERREXIT1(dinfo->cinfo, JERR_TOO_MANY_COLORS, num_colors);
-  /* Compute bits/pixel and related values */
-  BitsPerPixel = 1;
-  while (num_colors > (1 << BitsPerPixel))
-    BitsPerPixel++;
-  ColorMapSize = 1 << BitsPerPixel;
-  if (BitsPerPixel <= 1)
-    InitCodeSize = 2;
-  else
-    InitCodeSize = BitsPerPixel;
-  /*
-   * Write the GIF header.
-   * Note that we generate a plain GIF87 header for maximum compatibility.
-   */
-  putc('G', dinfo->pub.output_file);
-  putc('I', dinfo->pub.output_file);
-  putc('F', dinfo->pub.output_file);
-  putc('8', dinfo->pub.output_file);
-  putc('7', dinfo->pub.output_file);
-  putc('a', dinfo->pub.output_file);
-  /* Write the Logical Screen Descriptor */
-  put_word(dinfo, (unsigned int) dinfo->cinfo->output_width);
-  put_word(dinfo, (unsigned int) dinfo->cinfo->output_height);
-  FlagByte = 0x80;		/* Yes, there is a global color table */
-  FlagByte |= (BitsPerPixel-1) << 4; /* color resolution */
-  FlagByte |= (BitsPerPixel-1);	/* size of global color table */
-  putc(FlagByte, dinfo->pub.output_file);
-  putc(0, dinfo->pub.output_file); /* Background color index */
-  putc(0, dinfo->pub.output_file); /* Reserved (aspect ratio in GIF89) */
-  /* Write the Global Color Map */
-  /* If the color map is more than 8 bits precision, */
-  /* we reduce it to 8 bits by shifting */
-  for (i=0; i < ColorMapSize; i++) {
-    if (i < num_colors) {
-      if (colormap != NULL) {
-	if (dinfo->cinfo->out_color_space == JCS_RGB) {
-	  /* Normal case: RGB color map */
-	  putc(GETJSAMPLE(colormap[0][i]) >> cshift, dinfo->pub.output_file);
-	  putc(GETJSAMPLE(colormap[1][i]) >> cshift, dinfo->pub.output_file);
-	  putc(GETJSAMPLE(colormap[2][i]) >> cshift, dinfo->pub.output_file);
-	} else {
-	  /* Grayscale "color map": possible if quantizing grayscale image */
-	  put_3bytes(dinfo, GETJSAMPLE(colormap[0][i]) >> cshift);
-	}
-      } else {
-	/* Create a gray-scale map of num_colors values, range 0..255 */
-	put_3bytes(dinfo, (i * 255 + (num_colors-1)/2) / (num_colors-1));
-      }
-    } else {
-      /* fill out the map to a power of 2 */
-      put_3bytes(dinfo, 0);
-    }
-  }
-  /* Write image separator and Image Descriptor */
-  putc(',', dinfo->pub.output_file); /* separator */
-  put_word(dinfo, 0);		/* left/top offset */
-  put_word(dinfo, 0);
-  put_word(dinfo, (unsigned int) dinfo->cinfo->output_width); /* image size */
-  put_word(dinfo, (unsigned int) dinfo->cinfo->output_height);
-  /* flag byte: not interlaced, no local color map */
-  putc(0x00, dinfo->pub.output_file);
-  /* Write Initial Code Size byte */
-  putc(InitCodeSize, dinfo->pub.output_file);
-
-  /* Initialize for "compression" of image data */
-  compress_init(dinfo, InitCodeSize+1);
-}
-
-
-/*
- * Startup: write the file header.
- */
-
-METHODDEF(void)
-start_output_gif (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
-{
-  gif_dest_ptr dest = (gif_dest_ptr) dinfo;
-
-  if (cinfo->quantize_colors)
-    emit_header(dest, cinfo->actual_number_of_colors, cinfo->colormap);
-  else
-    emit_header(dest, 256, (JSAMPARRAY) NULL);
-}
-
-
-/*
- * Write some pixel data.
- * In this module rows_supplied will always be 1.
- */
-
-METHODDEF(void)
-put_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
-		JDIMENSION rows_supplied)
-{
-  gif_dest_ptr dest = (gif_dest_ptr) dinfo;
-  register JSAMPROW ptr;
-  register JDIMENSION col;
-
-  ptr = dest->pub.buffer[0];
-  for (col = cinfo->output_width; col > 0; col--) {
-    compress_pixel(dest, GETJSAMPLE(*ptr++));
-  }
-}
-
-
-/*
- * Finish up at the end of the file.
- */
-
-METHODDEF(void)
-finish_output_gif (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
-{
-  gif_dest_ptr dest = (gif_dest_ptr) dinfo;
-
-  /* Flush "compression" mechanism */
-  compress_term(dest);
-  /* Write a zero-length data block to end the series */
-  putc(0, dest->pub.output_file);
-  /* Write the GIF terminator mark */
-  putc(';', dest->pub.output_file);
-  /* Make sure we wrote the output file OK */
-  fflush(dest->pub.output_file);
-  if (ferror(dest->pub.output_file))
-    ERREXIT(cinfo, JERR_FILE_WRITE);
-}
-
-
-/*
- * The module selection routine for GIF format output.
- */
-
-GLOBAL(djpeg_dest_ptr)
-jinit_write_gif (j_decompress_ptr cinfo)
-{
-  gif_dest_ptr dest;
-
-  /* Create module interface object, fill in method pointers */
-  dest = (gif_dest_ptr)
-      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
-				  SIZEOF(gif_dest_struct));
-  dest->cinfo = cinfo;		/* make back link for subroutines */
-  dest->pub.start_output = start_output_gif;
-  dest->pub.put_pixel_rows = put_pixel_rows;
-  dest->pub.finish_output = finish_output_gif;
-
-  if (cinfo->out_color_space != JCS_GRAYSCALE &&
-      cinfo->out_color_space != JCS_RGB)
-    ERREXIT(cinfo, JERR_GIF_COLORSPACE);
-
-  /* Force quantization if color or if > 8 bits input */
-  if (cinfo->out_color_space != JCS_GRAYSCALE || cinfo->data_precision > 8) {
-    /* Force quantization to at most 256 colors */
-    cinfo->quantize_colors = TRUE;
-    if (cinfo->desired_number_of_colors > 256)
-      cinfo->desired_number_of_colors = 256;
-  }
-
-  /* Calculate output image dimensions so we can allocate space */
-  jpeg_calc_output_dimensions(cinfo);
-
-  if (cinfo->output_components != 1) /* safety check: just one component? */
-    ERREXIT(cinfo, JERR_GIF_BUG);
-
-  /* Create decompressor output buffer. */
-  dest->pub.buffer = (*cinfo->mem->alloc_sarray)
-    ((j_common_ptr) cinfo, JPOOL_IMAGE, cinfo->output_width, (JDIMENSION) 1);
-  dest->pub.buffer_height = 1;
-
-  return (djpeg_dest_ptr) dest;
-}
-
-#endif /* GIF_SUPPORTED */