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From: envbvs@epb2.lbl.gov (Brian V. Smith)
Newsgroups: comp.windows.x
Subject: Re: converting icons
Keywords: faster reversebyte
Message-ID: <2625@helios.ee.lbl.gov>
Date: 12 May 89 16:44:18 GMT
References: <1014@draken.nada.kth.se> <2194@valhalla.ee.rochester.edu>
Sender: usenet@helios.ee.lbl.gov
Lines: 63

In article <1014@draken.nada.kth.se>, d87-jse@nada.kth.se (Joakim Sernbrant) writes:
> In article <2194@valhalla.ee.rochester.edu> deke@ee.rochester.edu (Dikran Kassabian) writes:
> >
> >I'd like to be able to use some of the classier icons I've collected and
> >had been using with suntools.  As a first pass, I just pulled out the
> >sunview icon header, put in my notion of a reasonable X icon header, and 
> >used 'bitmap' to display the icon image.  It looked almost right... but 
> >not quite.  It was as though each of the objects were mirror imaged, but
> >were correctly placed relative to eachother.  Additionally, some of the
> >borders seemed out of place.
> >
> 
> The problem is that the bits are stored from left to right in one
> format and right to left in the other (can't remember which) ...
> 
> Here is a quick hack I did to convert bitmaps from Sun to X (use
> it any way you like) :
> 
   [program follows]

Instead of the reverse() procedure provided, here is a much faster way
to reverse bits in a byte:

unsigned char   reverse_byte[256] = {
                0x00,0x80,0x40,0xc0,0x20,0xa0,0x60,0xe0,
                0x10,0x90,0x50,0xd0,0x30,0xb0,0x70,0xf0,
                0x08,0x88,0x48,0xc8,0x28,0xa8,0x68,0xe8,
                0x18,0x98,0x58,0xd8,0x38,0xb8,0x78,0xf8,
                0x04,0x84,0x44,0xc4,0x24,0xa4,0x64,0xe4,
                0x14,0x94,0x54,0xd4,0x34,0xb4,0x74,0xf4,
                0x0c,0x8c,0x4c,0xcc,0x2c,0xac,0x6c,0xec,
                0x1c,0x9c,0x5c,0xdc,0x3c,0xbc,0x7c,0xfc,
                0x02,0x82,0x42,0xc2,0x22,0xa2,0x62,0xe2,
                0x12,0x92,0x52,0xd2,0x32,0xb2,0x72,0xf2,
                0x0a,0x8a,0x4a,0xca,0x2a,0xaa,0x6a,0xea,
                0x1a,0x9a,0x5a,0xda,0x3a,0xba,0x7a,0xfa,
                0x06,0x86,0x46,0xc6,0x26,0xa6,0x66,0xe6,
                0x16,0x96,0x56,0xd6,0x36,0xb6,0x76,0xf6,
                0x0e,0x8e,0x4e,0xce,0x2e,0xae,0x6e,0xee,
                0x1e,0x9e,0x5e,0xde,0x3e,0xbe,0x7e,0xfe,
                0x01,0x81,0x41,0xc1,0x21,0xa1,0x61,0xe1,
                0x11,0x91,0x51,0xd1,0x31,0xb1,0x71,0xf1,
                0x09,0x89,0x49,0xc9,0x29,0xa9,0x69,0xe9,
                0x19,0x99,0x59,0xd9,0x39,0xb9,0x79,0xf9,
                0x05,0x85,0x45,0xc5,0x25,0xa5,0x65,0xe5,
                0x15,0x95,0x55,0xd5,0x35,0xb5,0x75,0xf5,
                0x0d,0x8d,0x4d,0xcd,0x2d,0xad,0x6d,0xed,
                0x1d,0x9d,0x5d,0xdd,0x3d,0xbd,0x7d,0xfd,
                0x03,0x83,0x43,0xc3,0x23,0xa3,0x63,0xe3,
                0x13,0x93,0x53,0xd3,0x33,0xb3,0x73,0xf3,
                0x0b,0x8b,0x4b,0xcb,0x2b,0xab,0x6b,0xeb,
                0x1b,0x9b,0x5b,0xdb,0x3b,0xbb,0x7b,0xfb,
                0x07,0x87,0x47,0xc7,0x27,0xa7,0x67,0xe7,
                0x17,0x97,0x57,0xd7,0x37,0xb7,0x77,0xf7,
                0x0f,0x8f,0x4f,0xcf,0x2f,0xaf,0x6f,0xef,
                0x1f,0x9f,0x5f,0xdf,0x3f,0xbf,0x7f,0xff
};

Just use the array values.  e.g. reverse(x) = reverse_byte[x];
_____________________________________
Brian V. Smith    (bvsmith@lbl.gov)
Lawrence Berkeley Laboratory
We don't need no signatures!