| int blockSizeSearch (fileName, targetPSNR, startBlockSizeIdx)) |
| 01. | blockSizes[14] = { 4x4, 5x4, ..., 12x12 } |
| 02. | currentBlockSizeIdx= = startBlockSizeIdx |
| 03. | direction = 0 |
| 04. | do |
| 05. | execute astcenc with blockSizes[currentBlockSizeIdx] and fileName |
| 06. | obtain PSNR from astcenc |
| 07. | if (direction == 0) |
| 08. | direction = (PSNR≥targetPSNR)? 1:-1 |
| 09. | if (direction ==1) |
| 10. | if (PSNR<targetPSNR) |
| 11. | currentBlockSizeIdx -= 1 |
| 12. | break |
| 13. | if (currentBlockSizeIdx == 13) |
| 14. | break |
| 15. | if (direction == -1) |
| 16. | if (PSNR≥targetPSNR || currentBlockSizeIdx == 0) |
| 17. | break |
| 18. | currentBlockSizeIdx += direction |
| 19. | while (true) |
| 20. | return currentBlockSizeIdx |