xbmc/pictures/PictureScalingAlgorithm.cpp

   1 /*
   2  *  Copyright (C) 2015-2018 Team Kodi
   3  *  This file is part of Kodi - https://kodi.tv
   4  *
   5  *  SPDX-License-Identifier: GPL-2.0-or-later
   6  *  See LICENSES/README.md for more information.
   7  */
   8
   9 #include <algorithm>
  10
  11 extern "C" {
  12 #include <libswscale/swscale.h>
  13 }
  14
  15 #include "PictureScalingAlgorithm.h"
  16 #include "utils/StringUtils.h"
  17
  18 CPictureScalingAlgorithm::Algorithm CPictureScalingAlgorithm::Default = CPictureScalingAlgorithm::Bicubic;
  19
  20 CPictureScalingAlgorithm::AlgorithmMap CPictureScalingAlgorithm::m_algorithms = {
  21   { FastBilinear,     { "fast_bilinear",    SWS_FAST_BILINEAR } },
  22   { Bilinear,         { "bilinear",         SWS_BILINEAR } },
  23   { Bicubic,          { "bicubic",          SWS_BICUBIC } },
  24   { Experimental,     { "experimental",     SWS_X } },
  25   { NearestNeighbor,  { "nearest_neighbor", SWS_POINT } },
  26   { AveragingArea,    { "averaging_area",   SWS_AREA } },
  27   { Bicublin,         { "bicublin",         SWS_BICUBLIN } },
  28   { Gaussian,         { "gaussian",         SWS_GAUSS } },
  29   { Sinc,             { "sinc",             SWS_SINC } },
  30   { Lanczos,          { "lanczos",          SWS_LANCZOS } },
  31   { BicubicSpline,    { "bicubic_spline",   SWS_SPLINE } },
  32 };
  33
  34 CPictureScalingAlgorithm::Algorithm CPictureScalingAlgorithm::FromString(const std::string& scalingAlgorithm)
  35 {
  36   const auto& algorithm = std::find_if(m_algorithms.begin(), m_algorithms.end(),
  37     [&scalingAlgorithm](const std::pair<Algorithm, ScalingAlgorithm>& algo) { return StringUtils::EqualsNoCase(algo.second.name, scalingAlgorithm); });
  38   if (algorithm != m_algorithms.end())
  39     return algorithm->first;
  40
  41   return NoAlgorithm;
  42 }
  43
  44 std::string CPictureScalingAlgorithm::ToString(Algorithm scalingAlgorithm)
  45 {
  46   const auto& algorithm = m_algorithms.find(scalingAlgorithm);
  47   if (algorithm != m_algorithms.end())
  48     return algorithm->second.name;
  49
  50   return "";
  51 }
  52
  53 int CPictureScalingAlgorithm::ToSwscale(const std::string& scalingAlgorithm)
  54 {
  55   return ToSwscale(FromString(scalingAlgorithm));
  56 }
  57
  58 int CPictureScalingAlgorithm::ToSwscale(Algorithm scalingAlgorithm)
  59 {
  60   const auto& algorithm = m_algorithms.find(scalingAlgorithm);
  61   if (algorithm != m_algorithms.end())
  62     return algorithm->second.swscale;
  63
  64   return ToSwscale(Default);
  65 }