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

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• Author : sammy
  Date : 2010-05-22 18:48:27
  Hash : deffdbba
  Message : Support bitmap (1 bpp) fonts. Patch courtesy of Jaakko Hyvätti.

• src/FTGlyph/FTPixmapGlyph.cpp

• /*
   * FTGL - OpenGL font library
   *
   * Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz>
   * 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 <math.h>
  
  #include "FTGL/ftgl.h"
  
  #include "FTInternals.h"
  #include "FTPixmapGlyphImpl.h"
  
  
  //
  //  FTGLPixmapGlyph
  //
  
  
  FTPixmapGlyph::FTPixmapGlyph(FT_GlyphSlot glyph) :
      FTGlyph(new FTPixmapGlyphImpl(glyph))
  {}
  
  
  FTPixmapGlyph::~FTPixmapGlyph()
  {}
  
  
  const FTPoint& FTPixmapGlyph::Render(const FTPoint& pen, int renderMode)
  {
      FTPixmapGlyphImpl *myimpl = dynamic_cast<FTPixmapGlyphImpl *>(impl);
      return myimpl->RenderImpl(pen, renderMode);
  }
  
  
  //
  //  FTGLPixmapGlyphImpl
  //
  
  
  FTPixmapGlyphImpl::FTPixmapGlyphImpl(FT_GlyphSlot glyph)
  :   FTGlyphImpl(glyph),
      destWidth(0),
      destHeight(0),
      data(0)
  {
      err = FT_Render_Glyph(glyph, FT_RENDER_MODE_NORMAL);
      if(err || ft_glyph_format_bitmap != glyph->format)
      {
          return;
      }
  
      FT_Bitmap bitmap = glyph->bitmap;
  
      //check the pixel mode
      //ft_pixel_mode_grays
  
      int srcWidth = bitmap.width;
      int srcHeight = bitmap.rows;
  
      destWidth = srcWidth;
      destHeight = srcHeight;
  
      if(destWidth && destHeight)
      {
          data = new unsigned char[destWidth * destHeight * 2];
          unsigned char* src = bitmap.buffer;
  
          unsigned char* dest = data + ((destHeight - 1) * destWidth * 2);
          size_t destStep = destWidth * 2 * 2;
  
          if (FT_PIXEL_MODE_MONO == bitmap.pixel_mode)
          {
              // Convert the 1 bpp bitmap to 8 bpp
              for(int y = 0; y < srcHeight; ++y)
              {
                  for(int x = 0; x < srcWidth; ++x)
                  {
                      *dest++ = static_cast<unsigned char>(255);
                      // Store 255 if bit (x % 8) is set, store 0 otherwise
                      *dest++ = static_cast<unsigned char>(static_cast<signed char>(src[static_cast<unsigned int>(x) >> 3] << (x & 7)) >> 7);
                  }
                  dest -= destStep;
                  src += bitmap.pitch;
              }
          }
          else
          {
              for(int y = 0; y < srcHeight; ++y)
              {
                  for(int x = 0; x < srcWidth; ++x)
                  {
                      *dest++ = static_cast<unsigned char>(255);
                      *dest++ = *src++;
                  }
                  dest -= destStep;
              }
          }
  
          destHeight = srcHeight;
      }
  
      pos.X(glyph->bitmap_left);
      pos.Y(srcHeight - glyph->bitmap_top);
  }
  
  
  FTPixmapGlyphImpl::~FTPixmapGlyphImpl()
  {
      delete [] data;
  }
  
  
  const FTPoint& FTPixmapGlyphImpl::RenderImpl(const FTPoint& pen,
                                               int renderMode)
  {
      if(data)
      {
          float dx, dy;
  
          dx = floor(pen.Xf() + pos.Xf());
          dy = floor(pen.Yf() - pos.Yf());
  
          glBitmap(0, 0, 0.0f, 0.0f, dx, dy, (const GLubyte*)0);
          glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
          glPixelStorei(GL_UNPACK_ALIGNMENT, 2);
  
          glDrawPixels(destWidth, destHeight, GL_LUMINANCE_ALPHA,
                       GL_UNSIGNED_BYTE, (const GLvoid*)data);
          glBitmap(0, 0, 0.0f, 0.0f, -dx, -dy, (const GLubyte*)0);
      }
  
      return advance;
  }