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Patch #4830 from Dave Hooper - improved grayscale for the H1x0

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9041 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Dave Chapman 2006-03-15 01:41:54 +00:00
parent ec855445b3
commit 67760ded33
1 changed files with 10 additions and 3 deletions
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13
apps/plugins/pacbox/arcade.c
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@ -33,8 +33,13 @@ extern struct plugin_api* rb;
/* Convert RGB888 to 2-bit greyscale - logic taken from bmp2rb.c */
static fb_data rgb_to_gray(unsigned int r, unsigned int g, unsigned int b)
{
int brightness = ((3*r + 6*g + b) / 10);
return ((brightness & 0xc0) >> 6);
int brightness = ( 2*r + 4*g + b );
if( r == 0 && g == 0 && b == 0 )
return 3;
brightness = (brightness/450);
if( brightness > 2 ) return 0;
else return 2-brightness;
}
#endif
@ -294,7 +299,9 @@ void decodeROMs(void)
(unsigned char) (c >> 8),
(unsigned char) (c >> 16));
#else
palette[i] = rgb_to_gray(c, c >> 8, c >> 16);
palette[i] = rgb_to_gray((unsigned char) (c),
(unsigned char) (c >> 8),
(unsigned char) (c >> 16) );
#endif
}
}