How to draw glyph (freetype) pixel by pixel?

Question

C++ / C#

I'm using a pixel buffer which has 3 bytes per pixel (rgb) and is organized line by line.
game.viewWidth - screen width in pixels.
buffer is the output image that is drawn to the screen.
I'm initializing the freetype library and trying to render a small letter 'a'.
But instead of 'a' I get some lines obliquely:


Killed 6 hours, did not understand anything. What am I doing wrong? All the tutorials say this code should work.

FT_Library ft;
  FT_Face face;

  if (FT_Init_FreeType(&ft))
    std::cout << "ERROR::FREETYPE: Could not init FreeType Library" << std::endl;

  if (FT_New_Face(ft, "fonts/arial.ttf", 0, &face))
    std::cout << "ERROR::FREETYPE: Failed to load font" << std::endl;

  FT_Set_Pixel_Sizes(face, 0, 72);

  FT_Load_Char(face, 'a', FT_LOAD_RENDER))
    std::cout << "ERROR::FREETYTPE: Failed to load Glyph" << std::endl;

  FT_GlyphSlot ch = face->glyph;
  for (int rows = 0; rows < ch->bitmap.rows; rows++)
    {
      for (int yi = 0; yi < ch->bitmap.width; yi++)
      {				
        buffer[rows*game.viewWidth * 3 + yi * 3] = ch->bitmap..buffer[(rows * ch->bitmap.pitch + yi) ];
        buffer[rows*game.viewWidth * 3 + yi * 3 + 1] = ch->bitmap.buffer[(rows * ch->bitmap.pitch + yi)];
        buffer[rows*game.viewWidth * 3 + yi * 3 + 2] = ch->bitmap.buffer[(rows * ch->bitmap.pitch + yi)];				
      }
    }