Method ReadPNGData

src/lua/LuaTextures.cpp:165–199

  private:
    bool ReadPNGData(const std::string& pngData) {
      std::istringstream iss(pngData);
      PNGImageFile image(&iss);
      if (!image.isOpen()) {
        return false;
      }

      type = GL_UNSIGNED_BYTE;
      xsize = (GLint)image.getWidth();
      ysize = (GLint)image.getHeight();

      // set the data format based on the number of channels
      const int channels = image.getNumChannels();
      switch (channels) {
        case 1: { format = GL_LUMINANCE;       break; }
        case 2: { format = GL_LUMINANCE_ALPHA; break; }
        case 3: { format = GL_RGB;       break; }
        case 4: { format = GL_RGBA;     break; }
        default: {
          return false;
        }
      }

      const int bufSize = (xsize * ysize * channels);
      data = new char[bufSize];
      if (!image.read(data)) {
        delete[] data;
        data = NULL;
        return false;
      }

      ownData = true;

      return true;
    }

  public:
    GLsizei xsize;