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Eliminate excessive I/O overhead when reading BMP files in cjpeg

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git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.1.x@592 632fc199-4ca6-4c93-a231-07263d6284db
This commit is contained in:
DRC
2011-04-25 22:41:14 +00:00
parent e43d21d57f
commit 049aef51d4
2 changed files with 10 additions and 7 deletions
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14
rdbmp.c
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@@ -3,6 +3,7 @@
*
* Copyright (C) 1994-1996, Thomas G. Lane.
* Modified 2009-2010 by Guido Vollbeding.
* Modified 2011 by Siarhei Siamashka.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@@ -220,10 +221,9 @@ preload_image (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
{
bmp_source_ptr source = (bmp_source_ptr) sinfo;
register FILE *infile = source->pub.input_file;
register int c;
register JSAMPROW out_ptr;
JSAMPARRAY image_ptr;
JDIMENSION row, col;
JDIMENSION row;
cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress;
/* Read the data into a virtual array in input-file row order. */
@@ -237,11 +237,11 @@ preload_image (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
((j_common_ptr) cinfo, source->whole_image,
row, (JDIMENSION) 1, TRUE);
out_ptr = image_ptr[0];
for (col = source->row_width; col > 0; col--) {
/* inline copy of read_byte() for speed */
if ((c = getc(infile)) == EOF)
ERREXIT(cinfo, JERR_INPUT_EOF);
*out_ptr++ = (JSAMPLE) c;
if (fread(out_ptr, 1, source->row_width, infile) != source->row_width) {
if (feof(infile))
ERREXIT(cinfo, JERR_INPUT_EOF);
else
ERREXIT(cinfo, JERR_FILE_READ);
}
}
if (progress != NULL)