Class: PNG::Encoder

Inherits:
Object
  • Object
show all
Defined in:
ext/png/png.c

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Object 



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# File 'ext/png/png.c', line 912

static VALUE
rb_encoder_initialize(int argc, VALUE* argv, VALUE self)
{
  png_encoder_t* ptr;
  VALUE exc;
  VALUE wd;
  VALUE ht;
  VALUE opts;

  /*
   * initialize
   */
  exc = Qnil;

  /*
   * strip object
   */
  TypedData_Get_Struct(self, png_encoder_t, &png_encoder_data_type, ptr);

  /*
   * parse argument
   */
  rb_scan_args(argc, argv, "2:", &wd, &ht, &opts);

  /*
   * check argument
   */
  do {
    if (TYPE(wd) != T_FIXNUM) {
      exc = create_argument_error("invalid width");
      break;
    }

    if (TYPE(ht) != T_FIXNUM) {
      exc = create_argument_error("invalid height");
      break;
    }
  } while (0);

  /*
   * set context
   */
  if (!RTEST(exc)) {
    exc = set_encoder_context(ptr, FIX2INT(wd), FIX2INT(ht), opts);
  }

  /*
   * post process
   */
  if (RTEST(exc)) rb_exc_raise(exc);

  return self;
}

Instance Method Details

#encode(data) ⇒ Object Also known as: compress, << 



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# File 'ext/png/png.c', line 1029

static VALUE
rb_encoder_encode(VALUE self, VALUE data)
{
  VALUE ret;
  VALUE exc;
  png_encoder_t* ptr;
  int state;

  /*
   * initialize
   */
  ret   = rb_str_buf_new(0);
  exc   = Qnil;
  state = 0;

  /*
   * strip object
   */
  TypedData_Get_Struct(self, png_encoder_t, &png_encoder_data_type, ptr);

  /*
   * argument check
   */
  Check_Type(data, T_STRING);

  if (RSTRING_LEN(data) < ptr->data_size) {
    ARGUMENT_ERROR("image data too short");
  }

  if (RSTRING_LEN(data) > ptr->data_size) {
    ARGUMENT_ERROR("image data too large");
  }

  /*
   * prepare
   */
  SET_DATA(ptr, data, ret);

  /*
   * do encode
   */
  if (!RTEST(exc)) {
    rb_protect(do_encode, (VALUE)ptr, &state);
  }

  /*
   * post process
   */
  if(state == 0) {
    rb_ivar_set(ret, rb_intern("warn"), ptr->warn_msg);
  }  
 
  CLR_DATA(ptr);
 
  if (state != 0) {
    rb_jump_tag(state);
  }

  /*
   * post process
   */
  ptr->ibuf = Qnil;
  ptr->obuf = Qnil;
  
  if (RTEST(exc)) rb_exc_raise(exc);

  return ret;
}