LCOV - code coverage report
Current view: top level - apps - gdalalg_raster_overview_add.cpp (source / functions) Hit Total Coverage
Test: gdal_filtered.info Lines: 67 67 100.0 %
Date: 2025-03-28 11:40:40 Functions: 4 4 100.0 %

          Line data    Source code
       1             : /******************************************************************************
       2             :  *
       3             :  * Project:  GDAL
       4             :  * Purpose:  gdal "raster overview add" subcommand
       5             :  * Author:   Even Rouault <even dot rouault at spatialys.com>
       6             :  *
       7             :  ******************************************************************************
       8             :  * Copyright (c) 2025, Even Rouault <even dot rouault at spatialys.com>
       9             :  *
      10             :  * SPDX-License-Identifier: MIT
      11             :  ****************************************************************************/
      12             : 
      13             : #include "gdalalg_raster_overview_add.h"
      14             : 
      15             : #include "cpl_string.h"
      16             : #include "gdal_priv.h"
      17             : 
      18             : //! @cond Doxygen_Suppress
      19             : 
      20             : #ifndef _
      21             : #define _(x) (x)
      22             : #endif
      23             : 
      24             : /************************************************************************/
      25             : /*                    GDALRasterOverviewAlgorithmAdd()                  */
      26             : /************************************************************************/
      27             : 
      28          11 : GDALRasterOverviewAlgorithmAdd::GDALRasterOverviewAlgorithmAdd()
      29          11 :     : GDALAlgorithm(NAME, DESCRIPTION, HELP_URL)
      30             : {
      31          11 :     AddProgressArg();
      32          11 :     AddOpenOptionsArg(&m_openOptions);
      33             :     AddArg("dataset", 0,
      34             :            _("Dataset (to be updated in-place, unless --external)"), &m_dataset,
      35          22 :            GDAL_OF_RASTER | GDAL_OF_UPDATE)
      36          11 :         .SetPositional()
      37          11 :         .SetRequired();
      38          22 :     AddArg("external", 0, _("Add external overviews"), &m_readOnly)
      39          22 :         .AddHiddenAlias("ro")
      40          11 :         .AddHiddenAlias(GDAL_ARG_NAME_READ_ONLY);
      41             : 
      42          22 :     AddArg("resampling", 'r', _("Resampling method"), &m_resampling)
      43             :         .SetChoices("nearest", "average", "cubic", "cubicspline", "lanczos",
      44          11 :                     "bilinear", "gauss", "average_magphase", "rms", "mode")
      45          11 :         .SetHiddenChoices("near");
      46             : 
      47             :     auto &levelArg =
      48          11 :         AddArg("levels", 0, _("Levels / decimation factors"), &m_levels);
      49             :     levelArg.AddValidationAction(
      50           5 :         [this, &levelArg]()
      51             :         {
      52           4 :             const auto &values = levelArg.Get<std::vector<int>>();
      53           7 :             for (const auto &value : values)
      54             :             {
      55           4 :                 if (value < 2)
      56             :                 {
      57           1 :                     ReportError(CE_Failure, CPLE_IllegalArg,
      58             :                                 "Values of 'levels' argument should be "
      59             :                                 "integers greater or equal to 2.");
      60           1 :                     return false;
      61             :                 }
      62             :             }
      63           3 :             return true;
      64          11 :         });
      65             : 
      66             :     auto &minSizeArg =
      67             :         AddArg("min-size", 0,
      68             :                _("Maximum width or height of the smallest overview level."),
      69          11 :                &m_minSize);
      70             :     minSizeArg.AddValidationAction(
      71           5 :         [this, &minSizeArg]()
      72             :         {
      73           4 :             const int val = minSizeArg.Get<int>();
      74           4 :             if (val <= 0)
      75             :             {
      76           1 :                 ReportError(CE_Failure, CPLE_IllegalArg,
      77             :                             "Value of 'min-size' should be an integer greater "
      78             :                             "or equal to 1.");
      79           1 :                 return false;
      80             :             }
      81           3 :             return true;
      82          11 :         });
      83          11 : }
      84             : 
      85             : /************************************************************************/
      86             : /*                GDALRasterOverviewAlgorithmAdd::RunImpl()             */
      87             : /************************************************************************/
      88             : 
      89           7 : bool GDALRasterOverviewAlgorithmAdd::RunImpl(GDALProgressFunc pfnProgress,
      90             :                                              void *pProgressData)
      91             : {
      92           7 :     auto poDS = m_dataset.GetDatasetRef();
      93           7 :     CPLAssert(poDS);
      94             : 
      95          14 :     std::string resampling = m_resampling;
      96           7 :     if (resampling.empty() && poDS->GetRasterCount() > 0)
      97             :     {
      98           4 :         auto poBand = poDS->GetRasterBand(1);
      99           4 :         if (poBand->GetOverviewCount() > 0)
     100             :         {
     101             :             const char *pszResampling =
     102           1 :                 poBand->GetOverview(0)->GetMetadataItem("RESAMPLING");
     103           1 :             if (pszResampling)
     104             :             {
     105           1 :                 resampling = pszResampling;
     106           1 :                 CPLDebug("GDAL",
     107             :                          "Reusing resampling method %s from existing "
     108             :                          "overview",
     109             :                          pszResampling);
     110             :             }
     111             :         }
     112             :     }
     113           7 :     if (resampling.empty())
     114           3 :         resampling = "nearest";
     115             : 
     116           7 :     std::vector<int> levels = m_levels;
     117             : 
     118             :     // If no levels are specified, reuse the potentially existing ones.
     119           7 :     if (levels.empty() && poDS->GetRasterCount() > 0)
     120             :     {
     121           4 :         auto poBand = poDS->GetRasterBand(1);
     122           4 :         const int nExistingCount = poBand->GetOverviewCount();
     123           4 :         if (nExistingCount > 0)
     124             :         {
     125           2 :             for (int iOvr = 0; iOvr < nExistingCount; ++iOvr)
     126             :             {
     127           1 :                 auto poOverview = poBand->GetOverview(iOvr);
     128           1 :                 if (poOverview)
     129             :                 {
     130           1 :                     const int nOvFactor = GDALComputeOvFactor(
     131             :                         poOverview->GetXSize(), poBand->GetXSize(),
     132           1 :                         poOverview->GetYSize(), poBand->GetYSize());
     133           1 :                     levels.push_back(nOvFactor);
     134             :                 }
     135             :             }
     136             :         }
     137             :     }
     138             : 
     139           7 :     if (levels.empty())
     140             :     {
     141           3 :         const int nXSize = poDS->GetRasterXSize();
     142           3 :         const int nYSize = poDS->GetRasterYSize();
     143           3 :         int nOvrFactor = 1;
     144           6 :         while (DIV_ROUND_UP(nXSize, nOvrFactor) > m_minSize ||
     145           3 :                DIV_ROUND_UP(nYSize, nOvrFactor) > m_minSize)
     146             :         {
     147           3 :             nOvrFactor *= 2;
     148           3 :             levels.push_back(nOvrFactor);
     149             :         }
     150             :     }
     151             : 
     152          14 :     return levels.empty() ||
     153           7 :            GDALBuildOverviews(GDALDataset::ToHandle(poDS), resampling.c_str(),
     154           7 :                               static_cast<int>(levels.size()), levels.data(), 0,
     155          14 :                               nullptr, pfnProgress, pProgressData) == CE_None;
     156             : }
     157             : 
     158             : //! @endcond

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