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 "Text.h"
  #include "__init__.h"
  
  
  // Get the color of the pixel on the text.
  uint16_t get_text_pixel(text_obj_t *text, int16_t x, int16_t y) {
  
      // Shift by the text's position offset.
      x -= text->x;
      y -= text->y;
  
      // Bounds check.
      if ((x < 0) || (x >= text->width << 3) ||
          (y < 0) || (y >= text->height << 3)) {
          return TRANSPARENT;
      }
  
      // Get the tile from the grid location or from sprite frame.
      uint8_t tx = x >> 3;
      uint8_t ty = y >> 3;
      uint8_t c = text->chars[ty * text->width + tx];
      uint8_t color_offset = 0;
      if (c & 0x80) {
          color_offset = 4;
      }
      c &= 0x7f;
      if (!c) {
          return TRANSPARENT;
      }
  
      // Get the position within the char.
      x &= 0x07;
      y &= 0x07;
  
      // Get the value of the pixel.
      uint8_t pixel = text->font[(c << 4) + (y << 1) + (x >> 2)];
      pixel = ((pixel >> ((x & 0x03) << 1)) & 0x03) + color_offset;
  
      // Convert to 16-bit color using the palette.
      return text->palette[pixel << 1] | text->palette[(pixel << 1) + 1] << 8;
  }
  