text: /*
   * This file is part of the MicroPython project, http://micropython.org/
   *
   * The MIT License (MIT)
   *
   * Copyright (c) 2017 Radomir Dopieralski
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  
  #include "__init__.h"
  #include "py/mperrno.h"
  #include "py/runtime.h"
  #include "shared-bindings/busio/SPI.h"
  #include "shared-bindings/displayio/Display.h"
  #include "shared-module/_stage/__init__.h"
  #include "shared-module/displayio/display_core.h"
  #include "Layer.h"
  #include "Text.h"
  
  //| :mod:`_stage` --- C-level helpers for animation of sprites on a stage
  //| =====================================================================
  //|
  //| .. module:: _stage
  //|   :synopsis: C-level helpers for animation of sprites on a stage
  //|   :platform: SAMD21
  //|
  //| The `_stage` module contains native code to speed-up the ```stage`` Library
  //| <https://github.com/python-ugame/circuitpython-stage>`_.
  //| Libraries
  //|
  //| .. toctree::
  //|     :maxdepth: 3
  //|
  //|     Layer
  //|     Text
  //|
  //| .. function:: render(x0, y0, x1, y1, layers, buffer, display[, scale])
  //|
  //|     Render and send to the display a fragment of the screen.
  //|
  //|     :param int x0: Left edge of the fragment.
  //|     :param int y0: Top edge of the fragment.
  //|     :param int x1: Right edge of the fragment.
  //|     :param int y1: Bottom edge of the fragment.
  //|     :param list layers: A list of the :py:class:`~_stage.Layer` objects.
  //|     :param bytearray buffer: A buffer to use for rendering.
  //|     :param ~displayio.Display display: The display to use.
  //|     :param int scale: How many times should the image be scaled up.
  //|
  //|     There are also no sanity checks, outside of the basic overflow
  //|     checking. The caller is responsible for making the passed parameters
  //|     valid.
  //|
  //|     This function is intended for internal use in the ``stage`` library
  //|     and all the necessary checks are performed there.
  STATIC mp_obj_t stage_render(size_t n_args, const mp_obj_t *args) {
      uint16_t x0 = mp_obj_get_int(args[0]);
      uint16_t y0 = mp_obj_get_int(args[1]);
      uint16_t x1 = mp_obj_get_int(args[2]);
      uint16_t y1 = mp_obj_get_int(args[3]);
  
      size_t layers_size = 0;
      mp_obj_t *layers;
      mp_obj_get_array(args[4], &layers_size, &layers);
  
      mp_buffer_info_t bufinfo;
      mp_get_buffer_raise(args[5], &bufinfo, MP_BUFFER_WRITE);
      uint16_t *buffer = bufinfo.buf;
      size_t buffer_size = bufinfo.len / 2; // 16-bit indexing
  
      mp_obj_t native_display = mp_instance_cast_to_native_base(args[6],
          &displayio_display_type);
      if (!MP_OBJ_IS_TYPE(native_display, &displayio_display_type)) {
          mp_raise_TypeError(translate("argument num/types mismatch"));
      }
      displayio_display_obj_t *display = MP_OBJ_TO_PTR(native_display);
      uint8_t scale = 1;
      if (n_args >= 8) {
          scale = mp_obj_get_int(args[7]);
      }
  
      // TODO: Everything below should be in shared-module because it's not argument parsing.
      while (!displayio_display_core_begin_transaction(&display->core)) {
          RUN_BACKGROUND_TASKS;
      }
      displayio_area_t area;
      area.x1 = x0;
      area.y1 = y0;
      area.x2 = x1;
      area.y2 = y1;
      displayio_display_core_set_region_to_update(&display->core, display->set_column_command, display->set_row_command, NO_COMMAND, NO_COMMAND, display->data_as_commands, false, &area);
  
      display->core.send(display->core.bus, DISPLAY_COMMAND, CHIP_SELECT_TOGGLE_EVERY_BYTE, &display->write_ram_command, 1);
      render_stage(x0, y0, x1, y1, layers, layers_size, buffer, buffer_size,
                   display, scale);
      displayio_display_core_end_transaction(&display->core);
  
      return mp_const_none;
  }
  MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(stage_render_obj, 7, 8, stage_render);
  
  
  STATIC const mp_rom_map_elem_t stage_module_globals_table[] = {
      { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR__stage) },
      { MP_ROM_QSTR(MP_QSTR_Layer), MP_ROM_PTR(&mp_type_layer) },
      { MP_ROM_QSTR(MP_QSTR_Text), MP_ROM_PTR(&mp_type_text) },
      { MP_ROM_QSTR(MP_QSTR_render), MP_ROM_PTR(&stage_render_obj) },
  };
  
  STATIC MP_DEFINE_CONST_DICT(stage_module_globals, stage_module_globals_table);
  
  const mp_obj_module_t stage_module = {
      .base = { &mp_type_module },
      .globals = (mp_obj_dict_t*)&stage_module_globals,
  };
  