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AltiVec SIMD implementation of RGB-to-Grayscale color conversion

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git-svn-id: svn://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1471 632fc199-4ca6-4c93-a231-07263d6284db
This commit is contained in:
DRC
2014-12-22 14:10:33 +00:00
parent 2a4e7f1bc3
commit 243aba148e
5 changed files with 367 additions and 1 deletions
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44
simd/jsimd_powerpc.c
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@@ -61,6 +61,19 @@ jsimd_can_rgb_ycc (void)
GLOBAL(int)
jsimd_can_rgb_gray (void)
{
init_simd();
/* The code is optimised for these values only */
if (BITS_IN_JSAMPLE != 8)
return 0;
if (sizeof(JDIMENSION) != 4)
return 0;
if ((RGB_PIXELSIZE != 3) && (RGB_PIXELSIZE != 4))
return 0;
if (simd_support & JSIMD_ALTIVEC)
return 1;
return 0;
}
@@ -119,6 +132,37 @@ jsimd_rgb_gray_convert (j_compress_ptr cinfo,
JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
JDIMENSION output_row, int num_rows)
{
void (*altivecfct)(JDIMENSION, JSAMPARRAY, JSAMPIMAGE, JDIMENSION, int);
switch(cinfo->in_color_space) {
case JCS_EXT_RGB:
altivecfct=jsimd_extrgb_gray_convert_altivec;
break;
case JCS_EXT_RGBX:
case JCS_EXT_RGBA:
altivecfct=jsimd_extrgbx_gray_convert_altivec;
break;
case JCS_EXT_BGR:
altivecfct=jsimd_extbgr_gray_convert_altivec;
break;
case JCS_EXT_BGRX:
case JCS_EXT_BGRA:
altivecfct=jsimd_extbgrx_gray_convert_altivec;
break;
case JCS_EXT_XBGR:
case JCS_EXT_ABGR:
altivecfct=jsimd_extxbgr_gray_convert_altivec;
break;
case JCS_EXT_XRGB:
case JCS_EXT_ARGB:
altivecfct=jsimd_extxrgb_gray_convert_altivec;
break;
default:
altivecfct=jsimd_rgb_gray_convert_altivec;
break;
}
altivecfct(cinfo->image_width, input_buf, output_buf, output_row, num_rows);
}
GLOBAL(void)