kc3-lang/ftgl/src/FTGlyph/FTBufferGlyph.cpp

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• Author : Frank Heckenbach
  Date : 2019-02-07 22:31:57
  Hash : 8ee0d83b
  Message : fix (if possible) or silence (otherwise) compiler warnings

• src/FTGlyph/FTBufferGlyph.cpp

• /*
   * FTGL - OpenGL font library
   *
   * Copyright (c) 2008 Sam Hocevar <sam@hocevar.net>
   *
   * 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 "config.h"
  
  #include <string>
  
  #include "FTGL/ftgl.h"
  
  #include "FTInternals.h"
  #include "FTBufferGlyphImpl.h"
  
  
  //
  //  FTGLBufferGlyph
  //
  
  
  FTBufferGlyph::FTBufferGlyph(FT_GlyphSlot glyph, FTBuffer *buffer) :
      FTGlyph(new FTBufferGlyphImpl(glyph, buffer))
  {}
  
  
  FTBufferGlyph::~FTBufferGlyph()
  {}
  
  
  const FTPoint& FTBufferGlyph::Render(const FTPoint& pen, int renderMode)
  {
      FTBufferGlyphImpl *myimpl = dynamic_cast<FTBufferGlyphImpl *>(impl);
      return myimpl->RenderImpl(pen, renderMode);
  }
  
  
  //
  //  FTGLBufferGlyphImpl
  //
  
  
  FTBufferGlyphImpl::FTBufferGlyphImpl(FT_GlyphSlot glyph, FTBuffer *p)
  :   FTGlyphImpl(glyph),
      has_bitmap(false),
      buffer(p)
  {
      err = FT_Render_Glyph(glyph, FT_RENDER_MODE_NORMAL);
      if(err || glyph->format != ft_glyph_format_bitmap)
      {
          return;
      }
  
      bitmap = glyph->bitmap;
      pixels = new unsigned char[bitmap.pitch * bitmap.rows];
      memcpy(pixels, bitmap.buffer, bitmap.pitch * bitmap.rows);
  
      if(bitmap.width && bitmap.rows)
      {
          has_bitmap = true;
          corner = FTPoint(glyph->bitmap_left, glyph->bitmap_top);
      }
  }
  
  
  FTBufferGlyphImpl::~FTBufferGlyphImpl()
  {
      delete[] pixels;
  }
  
  
  const FTPoint& FTBufferGlyphImpl::RenderImpl(const FTPoint& pen, int renderMode)
  {
      (void)renderMode;
  
      if(has_bitmap)
      {
          FTPoint pos(buffer->Pos() + pen + corner);
          int dx = (int)(pos.Xf() + 0.5f);
          int dy = buffer->Height() - (int)(pos.Yf() + 0.5f);
          unsigned char * dest = buffer->Pixels() + dx + dy * buffer->Width();
  
          for(int y = 0; y < int (bitmap.rows); y++)
          {
              // FIXME: change the loop bounds instead of doing this test
              if(y + dy < 0 || y + dy >= buffer->Height()) continue;
  
              if(bitmap.num_grays == 1)
              {
                  for(int x = 0; x < int (bitmap.width); x++)
                  {
                      if(x + dx < 0 || x + dx >= buffer->Width()) continue;
  
                      unsigned char p = pixels[y * bitmap.pitch + x / 8];
  
                      if((p << (x % 8)) & 0x80)
                      {
                          dest[y * buffer->Width() + x] = 255;
                      }
                  }
              }
              else
              {
                  for(int x = 0; x < int (bitmap.width); x++)
                  {
                      if(x + dx < 0 || x + dx >= buffer->Width()) continue;
  
                      unsigned char p = pixels[y * bitmap.pitch + x];
  
                      if(p)
                      {
                          dest[y * buffer->Width() + x] = p;
                      }
                  }
              }
          }
      }
  
      return advance;
  }