Ignore:
Timestamp:
May 5, 2011, 5:36:53 AM (14 years ago)
Author:
Dmitry A. Kuminov
Message:

trunk: Merged in qt 4.7.2 sources from branches/vendor/nokia/qt.

Location:
trunk
Files:
2 edited

Legend:

Unmodified
Added
Removed
  • trunk

  • trunk/src/3rdparty/libjpeg/jdatadst.c

    r2 r846  
    33 *
    44 * Copyright (C) 1994-1996, Thomas G. Lane.
     5 * Modified 2009 by Guido Vollbeding.
    56 * This file is part of the Independent JPEG Group's software.
    67 * For conditions of distribution and use, see the accompanying README file.
    78 *
    89 * This file contains compression data destination routines for the case of
    9  * emitting JPEG data to a file (or any stdio stream).  While these routines
    10  * are sufficient for most applications, some will want to use a different
    11  * destination manager.
     10 * emitting JPEG data to memory or to a file (or any stdio stream).
     11 * While these routines are sufficient for most applications,
     12 * some will want to use a different destination manager.
    1213 * IMPORTANT: we assume that fwrite() will correctly transcribe an array of
    1314 * JOCTETs into 8-bit-wide elements on external storage.  If char is wider
     
    2021#include "jerror.h"
    2122
     23#ifndef HAVE_STDLIB_H           /* <stdlib.h> should declare malloc(),free() */
     24extern void * malloc JPP((size_t size));
     25extern void free JPP((void *ptr));
     26#endif
     27
    2228
    2329/* Expanded data destination object for stdio output */
     
    3339
    3440#define OUTPUT_BUF_SIZE  4096   /* choose an efficiently fwrite'able size */
     41
     42
     43/* Expanded data destination object for memory output */
     44
     45typedef struct {
     46  struct jpeg_destination_mgr pub; /* public fields */
     47
     48  unsigned char ** outbuffer;   /* target buffer */
     49  unsigned long * outsize;
     50  unsigned char * newbuffer;    /* newly allocated buffer */
     51  JOCTET * buffer;              /* start of buffer */
     52  size_t bufsize;
     53} my_mem_destination_mgr;
     54
     55typedef my_mem_destination_mgr * my_mem_dest_ptr;
    3556
    3657
     
    5273  dest->pub.next_output_byte = dest->buffer;
    5374  dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
     75}
     76
     77METHODDEF(void)
     78init_mem_destination (j_compress_ptr cinfo)
     79{
     80  /* no work necessary here */
    5481}
    5582
     
    93120}
    94121
     122METHODDEF(boolean)
     123empty_mem_output_buffer (j_compress_ptr cinfo)
     124{
     125  size_t nextsize;
     126  JOCTET * nextbuffer;
     127  my_mem_dest_ptr dest = (my_mem_dest_ptr) cinfo->dest;
     128
     129  /* Try to allocate new buffer with double size */
     130  nextsize = dest->bufsize * 2;
     131  nextbuffer = malloc(nextsize);
     132
     133  if (nextbuffer == NULL)
     134    ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 10);
     135
     136  MEMCOPY(nextbuffer, dest->buffer, dest->bufsize);
     137
     138  if (dest->newbuffer != NULL)
     139    free(dest->newbuffer);
     140
     141  dest->newbuffer = nextbuffer;
     142
     143  dest->pub.next_output_byte = nextbuffer + dest->bufsize;
     144  dest->pub.free_in_buffer = dest->bufsize;
     145
     146  dest->buffer = nextbuffer;
     147  dest->bufsize = nextsize;
     148
     149  return TRUE;
     150}
     151
    95152
    96153/*
     
    118175  if (ferror(dest->outfile))
    119176    ERREXIT(cinfo, JERR_FILE_WRITE);
     177}
     178
     179METHODDEF(void)
     180term_mem_destination (j_compress_ptr cinfo)
     181{
     182  my_mem_dest_ptr dest = (my_mem_dest_ptr) cinfo->dest;
     183
     184  *dest->outbuffer = dest->buffer;
     185  *dest->outsize = dest->bufsize - dest->pub.free_in_buffer;
    120186}
    121187
     
    150216  dest->outfile = outfile;
    151217}
     218
     219
     220/*
     221 * Prepare for output to a memory buffer.
     222 * The caller may supply an own initial buffer with appropriate size.
     223 * Otherwise, or when the actual data output exceeds the given size,
     224 * the library adapts the buffer size as necessary.
     225 * The standard library functions malloc/free are used for allocating
     226 * larger memory, so the buffer is available to the application after
     227 * finishing compression, and then the application is responsible for
     228 * freeing the requested memory.
     229 */
     230
     231GLOBAL(void)
     232jpeg_mem_dest (j_compress_ptr cinfo,
     233               unsigned char ** outbuffer, unsigned long * outsize)
     234{
     235  my_mem_dest_ptr dest;
     236
     237  if (outbuffer == NULL || outsize == NULL)     /* sanity check */
     238    ERREXIT(cinfo, JERR_BUFFER_SIZE);
     239
     240  /* The destination object is made permanent so that multiple JPEG images
     241   * can be written to the same buffer without re-executing jpeg_mem_dest.
     242   */
     243  if (cinfo->dest == NULL) {    /* first time for this JPEG object? */
     244    cinfo->dest = (struct jpeg_destination_mgr *)
     245      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
     246                                  SIZEOF(my_mem_destination_mgr));
     247  }
     248
     249  dest = (my_mem_dest_ptr) cinfo->dest;
     250  dest->pub.init_destination = init_mem_destination;
     251  dest->pub.empty_output_buffer = empty_mem_output_buffer;
     252  dest->pub.term_destination = term_mem_destination;
     253  dest->outbuffer = outbuffer;
     254  dest->outsize = outsize;
     255  dest->newbuffer = NULL;
     256
     257  if (*outbuffer == NULL || *outsize == 0) {
     258    /* Allocate initial buffer */
     259    dest->newbuffer = *outbuffer = malloc(OUTPUT_BUF_SIZE);
     260    if (dest->newbuffer == NULL)
     261      ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 10);
     262    *outsize = OUTPUT_BUF_SIZE;
     263  }
     264
     265  dest->pub.next_output_byte = dest->buffer = *outbuffer;
     266  dest->pub.free_in_buffer = dest->bufsize = *outsize;
     267}
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