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Merge rotation into lookup table. 

Originally committed as revision 25774 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2010-11-20 09:36:46 +00:00
parent 7f48bfa1e3
commit d9640a55ea
1 changed files with 34 additions and 38 deletions
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72
libavformat/wc3movie.c
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@ -83,40 +83,41 @@ typedef struct Wc3DemuxContext {
* rounding issues, the maximum difference between
* the table values and the calculated doubles is
* about 0.497527
* The left-rotation of the input by 2 is also included in this table.
*/
static const unsigned char wc3_pal_lookup[] = {
0x00, 0x03, 0x05, 0x07, 0x09, 0x0B, 0x0D, 0x0E,
0x10, 0x12, 0x13, 0x15, 0x16, 0x18, 0x19, 0x1A,
0x1C, 0x1D, 0x1F, 0x20, 0x21, 0x23, 0x24, 0x25,
0x27, 0x28, 0x29, 0x2A, 0x2C, 0x2D, 0x2E, 0x2F,
0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x38, 0x39,
0x3A, 0x3B, 0x3C, 0x3D, 0x3F, 0x40, 0x41, 0x42,
0x43, 0x44, 0x45, 0x46, 0x48, 0x49, 0x4A, 0x4B,
0x4C, 0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53,
0x54, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, 0x5C,
0x5D, 0x5E, 0x5F, 0x60, 0x61, 0x62, 0x63, 0x64,
0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C,
0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72, 0x73, 0x74,
0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C,
0x7D, 0x7D, 0x7E, 0x7F, 0x80, 0x81, 0x82, 0x83,
0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B,
0x8C, 0x8D, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92,
0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x99,
0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F, 0xA0, 0xA1,
0xA2, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8,
0xA9, 0xAA, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF,
0xB0, 0xB1, 0xB2, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6,
0xB7, 0xB8, 0xB9, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD,
0xBE, 0xBF, 0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4,
0xC5, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xCB,
0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD0, 0xD1,
0xD2, 0xD3, 0xD4, 0xD5, 0xD5, 0xD6, 0xD7, 0xD8,
0xD9, 0xDA, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
0xDF, 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE4, 0xE5,
0xE6, 0xE7, 0xE8, 0xE9, 0xE9, 0xEA, 0xEB, 0xEC,
0xED, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF1, 0xF2,
0xF3, 0xF4, 0xF5, 0xF6, 0xF6, 0xF7, 0xF8, 0xF9,
0xFA, 0xFA, 0xFB, 0xFC, 0xFD, 0xFD, 0xFD, 0xFD
0x00, 0x09, 0x10, 0x16, 0x1C, 0x21, 0x27, 0x2C,
0x31, 0x35, 0x3A, 0x3F, 0x43, 0x48, 0x4C, 0x50,
0x54, 0x59, 0x5D, 0x61, 0x65, 0x69, 0x6D, 0x71,
0x75, 0x79, 0x7D, 0x80, 0x84, 0x88, 0x8C, 0x8F,
0x93, 0x97, 0x9A, 0x9E, 0xA2, 0xA5, 0xA9, 0xAC,
0xB0, 0xB3, 0xB7, 0xBA, 0xBE, 0xC1, 0xC5, 0xC8,
0xCB, 0xCF, 0xD2, 0xD5, 0xD9, 0xDC, 0xDF, 0xE3,
0xE6, 0xE9, 0xED, 0xF0, 0xF3, 0xF6, 0xFA, 0xFD,
0x03, 0x0B, 0x12, 0x18, 0x1D, 0x23, 0x28, 0x2D,
0x32, 0x36, 0x3B, 0x40, 0x44, 0x49, 0x4D, 0x51,
0x56, 0x5A, 0x5E, 0x62, 0x66, 0x6A, 0x6E, 0x72,
0x76, 0x7A, 0x7D, 0x81, 0x85, 0x89, 0x8D, 0x90,
0x94, 0x98, 0x9B, 0x9F, 0xA2, 0xA6, 0xAA, 0xAD,
0xB1, 0xB4, 0xB8, 0xBB, 0xBF, 0xC2, 0xC5, 0xC9,
0xCC, 0xD0, 0xD3, 0xD6, 0xDA, 0xDD, 0xE0, 0xE4,
0xE7, 0xEA, 0xED, 0xF1, 0xF4, 0xF7, 0xFA, 0xFD,
0x05, 0x0D, 0x13, 0x19, 0x1F, 0x24, 0x29, 0x2E,
0x33, 0x38, 0x3C, 0x41, 0x45, 0x4A, 0x4E, 0x52,
0x57, 0x5B, 0x5F, 0x63, 0x67, 0x6B, 0x6F, 0x73,
0x77, 0x7B, 0x7E, 0x82, 0x86, 0x8A, 0x8D, 0x91,
0x95, 0x99, 0x9C, 0xA0, 0xA3, 0xA7, 0xAA, 0xAE,
0xB2, 0xB5, 0xB9, 0xBC, 0xBF, 0xC3, 0xC6, 0xCA,
0xCD, 0xD0, 0xD4, 0xD7, 0xDA, 0xDE, 0xE1, 0xE4,
0xE8, 0xEB, 0xEE, 0xF1, 0xF5, 0xF8, 0xFB, 0xFD,
0x07, 0x0E, 0x15, 0x1A, 0x20, 0x25, 0x2A, 0x2F,
0x34, 0x39, 0x3D, 0x42, 0x46, 0x4B, 0x4F, 0x53,
0x58, 0x5C, 0x60, 0x64, 0x68, 0x6C, 0x70, 0x74,
0x78, 0x7C, 0x7F, 0x83, 0x87, 0x8B, 0x8E, 0x92,
0x96, 0x99, 0x9D, 0xA1, 0xA4, 0xA8, 0xAB, 0xAF,
0xB2, 0xB6, 0xB9, 0xBD, 0xC0, 0xC4, 0xC7, 0xCB,
0xCE, 0xD1, 0xD5, 0xD8, 0xDB, 0xDF, 0xE2, 0xE5,
0xE9, 0xEC, 0xEF, 0xF2, 0xF6, 0xF9, 0xFC, 0xFD
};
@ -144,7 +145,6 @@ static int wc3_read_header(AVFormatContext *s,
int current_palette = 0;
char *buffer;
int i;
unsigned char rotate;
/* default context members */
wc3->width = WC3_DEFAULT_WIDTH;
@ -212,11 +212,7 @@ static int wc3_read_header(AVFormatContext *s,
/* transform the current palette in place */
for (i = current_palette * PALETTE_SIZE;
i < (current_palette + 1) * PALETTE_SIZE; i++) {
/* rotate each palette component left by 2 and use the result
* as an index into the color component table */
rotate = ((wc3->palettes[i] << 2) & 0xFF) |
((wc3->palettes[i] >> 6) & 0xFF);
wc3->palettes[i] = wc3_pal_lookup[rotate];
wc3->palettes[i] = wc3_pal_lookup[wc3->palettes[i]];
}
current_palette++;
break;