Line data    Source code

       1             : /******************************************************************************
       2             :  *
       3             :  * Project:  GDAL
       4             :  * Purpose:  "nodata-to-alpha" step of "raster pipeline"
       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             : #ifndef GDALALG_RASTER_NODATA_TO_ALPHA_INCLUDED
      14             : #define GDALALG_RASTER_NODATA_TO_ALPHA_INCLUDED
      15             : 
      16             : #include "gdalalg_raster_pipeline.h"
      17             : 
      18             : //! @cond Doxygen_Suppress
      19             : 
      20             : /************************************************************************/
      21             : /*                  GDALRasterNoDataToAlphaAlgorithm                    */
      22             : /************************************************************************/
      23             : 
      24             : class GDALRasterNoDataToAlphaAlgorithm /* non final */
      25             :     : public GDALRasterPipelineStepAlgorithm
      26             : {
      27             :   public:
      28             :     static constexpr const char *NAME = "nodata-to-alpha";
      29             :     static constexpr const char *DESCRIPTION =
      30             :         "Replace nodata value(s) with an alpha band.";
      31             :     static constexpr const char *HELP_URL =
      32             :         "/programs/gdal_raster_nodata_to_alpha.html";
      33             : 
      34             :     explicit GDALRasterNoDataToAlphaAlgorithm(bool standaloneStep = false);
      35             : 
      36             :   private:
      37             :     bool RunStep(GDALPipelineStepRunContext &ctxt) override;
      38             : 
      39             :     std::vector<double> m_nodata{};
      40             : 
      41             :     // Work variables
      42             :     std::unique_ptr<GDALDataset> m_tempDS{};
      43             : };
      44             : 
      45             : /************************************************************************/
      46             : /*              GDALRasterNoDataToAlphaAlgorithmStandalone              */
      47             : /************************************************************************/
      48             : 
      49          16 : class GDALRasterNoDataToAlphaAlgorithmStandalone final
      50             :     : public GDALRasterNoDataToAlphaAlgorithm
      51             : {
      52             :   public:
      53           8 :     GDALRasterNoDataToAlphaAlgorithmStandalone()
      54           8 :         : GDALRasterNoDataToAlphaAlgorithm(/* standaloneStep = */ true)
      55             :     {
      56           8 :     }
      57             : 
      58             :     ~GDALRasterNoDataToAlphaAlgorithmStandalone() override;
      59             : };
      60             : 
      61             : //! @endcond
      62             : 
      63             : #endif /* GDALALG_RASTER_NODATA_TO_ALPHA_INCLUDED */