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Improve performance a bit for the non-SIMD case

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DRC
2011-02-27 10:26:08 +00:00
parent f2cb47a275
commit c17c5c8188
1 changed files with 17 additions and 9 deletions
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26
jccolor.c
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@@ -3,7 +3,7 @@
*
* Copyright (C) 1991-1996, Thomas G. Lane.
* Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
* Copyright 2009 D. R. Commander
* Copyright 2009-2011 D. R. Commander
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@@ -141,6 +141,10 @@ rgb_ycc_convert (j_compress_ptr cinfo,
register JSAMPROW outptr0, outptr1, outptr2;
register JDIMENSION col;
JDIMENSION num_cols = cinfo->image_width;
int rindex = rgb_red[cinfo->in_color_space];
int gindex = rgb_green[cinfo->in_color_space];
int bindex = rgb_blue[cinfo->in_color_space];
int rgbstride = rgb_pixelsize[cinfo->in_color_space];
while (--num_rows >= 0) {
inptr = *input_buf++;
@@ -149,10 +153,10 @@ rgb_ycc_convert (j_compress_ptr cinfo,
outptr2 = output_buf[2][output_row];
output_row++;
for (col = 0; col < num_cols; col++) {
r = GETJSAMPLE(inptr[rgb_red[cinfo->in_color_space]]);
g = GETJSAMPLE(inptr[rgb_green[cinfo->in_color_space]]);
b = GETJSAMPLE(inptr[rgb_blue[cinfo->in_color_space]]);
inptr += rgb_pixelsize[cinfo->in_color_space];
r = GETJSAMPLE(inptr[rindex]);
g = GETJSAMPLE(inptr[gindex]);
b = GETJSAMPLE(inptr[bindex]);
inptr += rgbstride;
/* If the inputs are 0..MAXJSAMPLE, the outputs of these equations
* must be too; we do not need an explicit range-limiting operation.
* Hence the value being shifted is never negative, and we don't
@@ -197,16 +201,20 @@ rgb_gray_convert (j_compress_ptr cinfo,
register JSAMPROW outptr;
register JDIMENSION col;
JDIMENSION num_cols = cinfo->image_width;
int rindex = rgb_red[cinfo->in_color_space];
int gindex = rgb_green[cinfo->in_color_space];
int bindex = rgb_blue[cinfo->in_color_space];
int rgbstride = rgb_pixelsize[cinfo->in_color_space];
while (--num_rows >= 0) {
inptr = *input_buf++;
outptr = output_buf[0][output_row];
output_row++;
for (col = 0; col < num_cols; col++) {
r = GETJSAMPLE(inptr[rgb_red[cinfo->in_color_space]]);
g = GETJSAMPLE(inptr[rgb_green[cinfo->in_color_space]]);
b = GETJSAMPLE(inptr[rgb_blue[cinfo->in_color_space]]);
inptr += rgb_pixelsize[cinfo->in_color_space];
r = GETJSAMPLE(inptr[rindex]);
g = GETJSAMPLE(inptr[gindex]);
b = GETJSAMPLE(inptr[bindex]);
inptr += rgbstride;
/* Y */
outptr[col] = (JSAMPLE)
((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF])