| 4861 | /************************************************************************/ |
| 4862 | |
| 4863 | static int GDALDatasetGetBestOverviewLevel(GDALDataset *poDS, int &nXOff, |
| 4864 | int &nYOff, int &nXSize, int &nYSize, |
| 4865 | int nBufXSize, int nBufYSize, |
| 4866 | int nBandCount, |
| 4867 | const int *panBandMap, |
| 4868 | GDALRasterIOExtraArg *psExtraArg) |
| 4869 | { |
| 4870 | int nOverviewCount = 0; |
| 4871 | GDALRasterBand *poFirstBand = nullptr; |
| 4872 | |
| 4873 | /* -------------------------------------------------------------------- */ |
| 4874 | /* Check that all bands have the same number of overviews and */ |
| 4875 | /* that they have all the same size and block dimensions */ |
| 4876 | /* -------------------------------------------------------------------- */ |
| 4877 | for (int iBand = 0; iBand < nBandCount; iBand++) |
| 4878 | { |
| 4879 | GDALRasterBand *poBand = poDS->GetRasterBand(panBandMap[iBand]); |
| 4880 | if (poBand == nullptr) |
| 4881 | return -1; |
| 4882 | if (iBand == 0) |
| 4883 | { |
| 4884 | poFirstBand = poBand; |
| 4885 | nOverviewCount = poBand->GetOverviewCount(); |
| 4886 | } |
| 4887 | else if (nOverviewCount != poBand->GetOverviewCount()) |
| 4888 | { |
| 4889 | CPLDebug("GDAL", "GDALDataset::GetBestOverviewLevel() ... " |
| 4890 | "mismatched overview count, use std method."); |
| 4891 | return -1; |
| 4892 | } |
| 4893 | else |
| 4894 | { |
| 4895 | for (int iOverview = 0; iOverview < nOverviewCount; iOverview++) |
| 4896 | { |
| 4897 | GDALRasterBand *poOvrBand = poBand->GetOverview(iOverview); |
| 4898 | GDALRasterBand *poOvrFirstBand = |
| 4899 | poFirstBand->GetOverview(iOverview); |
| 4900 | if (poOvrBand == nullptr || poOvrFirstBand == nullptr) |
| 4901 | continue; |
| 4902 | |
| 4903 | if (poOvrFirstBand->GetXSize() != poOvrBand->GetXSize() || |
| 4904 | poOvrFirstBand->GetYSize() != poOvrBand->GetYSize()) |
| 4905 | { |
| 4906 | CPLDebug("GDAL", |
| 4907 | "GDALDataset::GetBestOverviewLevel() ... " |
| 4908 | "mismatched overview sizes, use std method."); |
| 4909 | return -1; |
| 4910 | } |
| 4911 | int nBlockXSizeFirst = 0; |
| 4912 | int nBlockYSizeFirst = 0; |
| 4913 | poOvrFirstBand->GetBlockSize(&nBlockXSizeFirst, |
| 4914 | &nBlockYSizeFirst); |
| 4915 | |
| 4916 | int nBlockXSizeCurrent = 0; |
| 4917 | int nBlockYSizeCurrent = 0; |
| 4918 | poOvrBand->GetBlockSize(&nBlockXSizeCurrent, |
| 4919 | &nBlockYSizeCurrent); |
| 4920 |
no test coverage detected