base-text-renderer.cc

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////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2009-2022 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Octave is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Octave; see the file COPYING.  If not, see
// <https://www.gnu.org/licenses/>.
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////////////////////////////////////////////////////////////////////////
 
#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif
 
#include "base-text-renderer.h"
 
namespace octave
{
  void
  base_text_renderer::rotate_pixels (uint8NDArray& pixels, int rot_mode) const
  {
    switch (rot_mode)
      {
      case ROTATION_0:
        break;
 
      case ROTATION_90:
        {
          Array<octave_idx_type> perm (dim_vector (3, 1));
          perm(0) = 0;
          perm(1) = 2;
          perm(2) = 1;
          pixels = pixels.permute (perm);
 
          Array<idx_vector> idx (dim_vector (3, 1));
          idx(0) = idx_vector (':');
          idx(1) = idx_vector (pixels.dim2 ()-1, -1, -1);
          idx(2) = idx_vector (':');
          pixels = uint8NDArray (pixels.index (idx));
        }
        break;
 
      case ROTATION_180:
        {
          Array<idx_vector> idx (dim_vector (3, 1));
          idx(0) = idx_vector (':');
          idx(1) = idx_vector (pixels.dim2 ()-1, -1, -1);
          idx(2) = idx_vector (pixels.dim3 ()-1, -1, -1);
          pixels = uint8NDArray (pixels.index (idx));
        }
        break;
 
      case ROTATION_270:
        {
          Array<octave_idx_type> perm (dim_vector (3, 1));
          perm(0) = 0;
          perm(1) = 2;
          perm(2) = 1;
          pixels = pixels.permute (perm);
 
          Array<idx_vector> idx (dim_vector (3, 1));
          idx(0) = idx_vector (':');
          idx(1) = idx_vector (':');
          idx(2) = idx_vector (pixels.dim3 ()-1, -1, -1);
          pixels = uint8NDArray (pixels.index (idx));
        }
        break;
 
      }
  }
 
  int
  base_text_renderer::rotation_to_mode (double rotation) const
  {
    // Wrap rotation to range [0, 360]
    while (rotation < 0)
      rotation += 360.0;
    while (rotation > 360.0)
      rotation -= 360.0;
 
    if (rotation == 0.0)
      return ROTATION_0;
    else if (rotation == 90.0)
      return ROTATION_90;
    else if (rotation == 180.0)
      return ROTATION_180;
    else if (rotation == 270.0)
      return ROTATION_270;
    else
      return ROTATION_0;
  }
 
  void
  base_text_renderer::fix_bbox_anchor (Matrix& bbox, int halign,
                                       int valign, int rot_mode,
                                       bool handle_rotation) const
  {
    switch (halign)
      {
      case 1:
        bbox(0) = -bbox(2)/2;
        break;
 
      case 2:
        bbox(0) = -bbox(2);
        break;
 
      default:
        bbox(0) = 0;
        break;
      }
 
    switch (valign)
      {
      case 1:
        bbox(1) = -bbox(3)/2;
        break;
 
      case 2:
        bbox(1) = -bbox(3);
        break;
 
      case 3:
        break;
 
      case 4:
        bbox(1) = -bbox(3)-bbox(1);
        break;
 
      default:
        bbox(1) = 0;
        break;
      }
 
    if (handle_rotation)
      {
        switch (rot_mode)
          {
          case ROTATION_90:
            std::swap (bbox(0), bbox(1));
            std::swap (bbox(2), bbox(3));
            bbox(0) = -bbox(0)-bbox(2);
            break;
 
          case ROTATION_180:
            bbox(0) = -bbox(0)-bbox(2);
            bbox(1) = -bbox(1)-bbox(3);
            break;
 
          case ROTATION_270:
            std::swap (bbox(0), bbox(1));
            std::swap (bbox(2), bbox(3));
            bbox(1) = -bbox(1)-bbox(3);
            break;
          }
      }
  }
}