| 345 | } |
| 346 | |
| 347 | void SelectYCoCgDiagonal( const uint8_t* colorBlock, uint8_t* minColor, uint8_t* maxColor ) |
| 348 | { |
| 349 | uint8_t mid0 = ( (int)minColor[0] + maxColor[0] + 1 ) >> 1; |
| 350 | uint8_t mid1 = ( (int)minColor[1] + maxColor[1] + 1 ) >> 1; |
| 351 | |
| 352 | uint8_t side = 0; |
| 353 | for( int i = 0; i < 16; i++ ) |
| 354 | { |
| 355 | uint8_t b0 = colorBlock[i * 4 + 0] >= mid0; |
| 356 | uint8_t b1 = colorBlock[i * 4 + 1] >= mid1; |
| 357 | side += ( b0 ^ b1 ); |
| 358 | } |
| 359 | |
| 360 | uint8_t mask = -( side > 8 ); |
| 361 | |
| 362 | #ifdef NVIDIA_7X_HARDWARE_BUG_FIX |
| 363 | mask &= -( minColor[0] != maxColor[0] ); |
| 364 | #endif |
| 365 | |
| 366 | uint8_t c0 = minColor[1]; |
| 367 | uint8_t c1 = maxColor[1]; |
| 368 | |
| 369 | c0 ^= c1; |
| 370 | mask &= c0; |
| 371 | c1 ^= mask; |
| 372 | c0 ^= c1; |
| 373 | |
| 374 | minColor[1] = c0; |
| 375 | maxColor[1] = c1; |
| 376 | } |
| 377 | |
| 378 | void EmitAlphaIndices( const uint8_t* colorBlock, const uint8_t minAlpha, const uint8_t maxAlpha, uint8_t** outBuff ) |
| 379 | { |