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Improve performance a bit for the non-SIMD case

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DRC
2011-02-27 10:51:20 +00:00
parent c17c5c8188
commit 045e8f7f07
1 changed files with 8 additions and 4 deletions
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12
jdcolor.c
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@@ -130,6 +130,10 @@ ycc_rgb_convert (j_decompress_ptr cinfo,
register JSAMPROW inptr0, inptr1, inptr2; register JSAMPROW inptr0, inptr1, inptr2;
register JDIMENSION col; register JDIMENSION col;
JDIMENSION num_cols = cinfo->output_width; JDIMENSION num_cols = cinfo->output_width;
int rindex = rgb_red[cinfo->out_color_space];
int gindex = rgb_green[cinfo->out_color_space];
int bindex = rgb_blue[cinfo->out_color_space];
int rgbstride = rgb_pixelsize[cinfo->out_color_space];
/* copy these pointers into registers if possible */ /* copy these pointers into registers if possible */
register JSAMPLE * range_limit = cinfo->sample_range_limit; register JSAMPLE * range_limit = cinfo->sample_range_limit;
register int * Crrtab = cconvert->Cr_r_tab; register int * Crrtab = cconvert->Cr_r_tab;
@@ -149,12 +153,12 @@ ycc_rgb_convert (j_decompress_ptr cinfo,
cb = GETJSAMPLE(inptr1[col]); cb = GETJSAMPLE(inptr1[col]);
cr = GETJSAMPLE(inptr2[col]); cr = GETJSAMPLE(inptr2[col]);
/* Range-limiting is essential due to noise introduced by DCT losses. */ /* Range-limiting is essential due to noise introduced by DCT losses. */
outptr[rgb_red[cinfo->out_color_space]] = range_limit[y + Crrtab[cr]]; outptr[rindex] = range_limit[y + Crrtab[cr]];
outptr[rgb_green[cinfo->out_color_space]] = range_limit[y + outptr[gindex] = range_limit[y +
((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
SCALEBITS))]; SCALEBITS))];
outptr[rgb_blue[cinfo->out_color_space]] = range_limit[y + Cbbtab[cb]]; outptr[bindex] = range_limit[y + Cbbtab[cb]];
outptr += rgb_pixelsize[cinfo->out_color_space]; outptr += rgbstride;
} }
} }
} }