Function parseHexFormat

src/common/ParseColor.cpp:53–106

static bool parseHexFormat(const char* str, fvec4& color) {
  int bytes[8];
  int index;
  for (index = 0; index < 8; index++) {
    const char c = str[index];
    if ((c == 0) || isspace(c)) {
      break;
    }
    const int byte = parseHexChar(c);
    if (byte < 0) {
      return false; // not a hex character
    }
    bytes[index] = byte;
  }

  // check for a valid termination
  if (index == 8) {
    const char c = str[8];
    if ((c != 0) && !isspace(c)) {
      return false;
    }
  }

  switch (index) {
    case 3: { // rgb
      color.r = (float)bytes[0] / 15.0f;
      color.g = (float)bytes[1] / 15.0f;
      color.b = (float)bytes[2] / 15.0f;
      return true;
    }
    case 4: { // rgba
      color.r = (float)bytes[0] / 15.0f;
      color.g = (float)bytes[1] / 15.0f;
      color.b = (float)bytes[2] / 15.0f;
      color.a = (float)bytes[3] / 15.0f;
      return true;
    }
    case 6: { // rrggbb
      color.r = (float)((bytes[0] << 4) + bytes[1]) / 255.0f;
      color.g = (float)((bytes[2] << 4) + bytes[3]) / 255.0f;
      color.b = (float)((bytes[4] << 4) + bytes[5]) / 255.0f;
      return true;
    }
    case 8: { // rrggbbaa
      color.r = (float)((bytes[0] << 4) + bytes[1]) / 255.0f;
      color.g = (float)((bytes[2] << 4) + bytes[3]) / 255.0f;
      color.b = (float)((bytes[4] << 4) + bytes[5]) / 255.0f;
      color.a = (float)((bytes[6] << 4) + bytes[7]) / 255.0f;
      return true;
    }
  }

  return false;
}


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