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

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• Hash : 8932eba0
  Author :
  Date : 2008-05-20T23:48:56
  

  * Rename FTTextureGlyphImpl::pos to FTTextureGlyphImpl::corner because pos was misleading.

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• src/FTGlyph/FTTextureGlyph.cpp

• /*
   * FTGL - OpenGL font library
   *
   * Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz>
   *
   * 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 "FTTextureGlyphImpl.h"
  
  
  //
  //  FTGLTextureGlyph
  //
  
  
  FTTextureGlyph::FTTextureGlyph(FT_GlyphSlot glyph, int id, int xOffset,
                                 int yOffset, int width, int height) :
      FTGlyph(new FTTextureGlyphImpl(glyph, id, xOffset, yOffset, width, height))
  {}
  
  
  FTTextureGlyph::~FTTextureGlyph()
  {}
  
  
  const FTPoint& FTTextureGlyph::Render(const FTPoint& pen, int renderMode)
  {
      FTTextureGlyphImpl *myimpl = dynamic_cast<FTTextureGlyphImpl *>(impl);
      return myimpl->RenderImpl(pen, renderMode);
  }
  
  
  //
  //  FTGLTextureGlyphImpl
  //
  
  
  GLint FTTextureGlyphImpl::activeTextureID = 0;
  
  FTTextureGlyphImpl::FTTextureGlyphImpl(FT_GlyphSlot glyph, int id, int xOffset,
                                         int yOffset, int width, int height)
  :   FTGlyphImpl(glyph),
      destWidth(0),
      destHeight(0),
      glTextureID(id)
  {
      /* FIXME: need to propagate the render mode all the way down to
       * here in order to get FT_RENDER_MODE_MONO aliased fonts.
       */
  
      err = FT_Render_Glyph(glyph, FT_RENDER_MODE_NORMAL);
      if(err || glyph->format != ft_glyph_format_bitmap)
      {
          return;
      }
  
      FT_Bitmap      bitmap = glyph->bitmap;
  
      destWidth  = bitmap.width;
      destHeight = bitmap.rows;
  
      if(destWidth && destHeight)
      {
          glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
          glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE);
          glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
          glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  
          glBindTexture(GL_TEXTURE_2D, glTextureID);
          glTexSubImage2D(GL_TEXTURE_2D, 0, xOffset, yOffset, destWidth, destHeight, GL_ALPHA, GL_UNSIGNED_BYTE, bitmap.buffer);
  
          glPopClientAttrib();
      }
  
  
  //      0
  //      +----+
  //      |    |
  //      |    |
  //      |    |
  //      +----+
  //           1
  
      uv[0].X(static_cast<float>(xOffset) / static_cast<float>(width));
      uv[0].Y(static_cast<float>(yOffset) / static_cast<float>(height));
      uv[1].X(static_cast<float>(xOffset + destWidth) / static_cast<float>(width));
      uv[1].Y(static_cast<float>(yOffset + destHeight) / static_cast<float>(height));
  
      corner = FTPoint(glyph->bitmap_left, glyph->bitmap_top);
  }
  
  
  FTTextureGlyphImpl::~FTTextureGlyphImpl()
  {}
  
  
  const FTPoint& FTTextureGlyphImpl::RenderImpl(const FTPoint& pen,
                                                int renderMode)
  {
      float dx, dy;
  
      if(activeTextureID != glTextureID)
      {
          glBindTexture(GL_TEXTURE_2D, (GLuint)glTextureID);
          activeTextureID = glTextureID;
      }
  
      dx = floor(pen.Xf() + corner.Xf());
      dy = floor(pen.Yf() + corner.Yf());
  
      glBegin(GL_QUADS);
          glTexCoord2f(uv[0].Xf(), uv[0].Yf());
          glVertex2f(dx, dy);
  
          glTexCoord2f(uv[0].Xf(), uv[1].Yf());
          glVertex2f(dx, dy - destHeight);
  
          glTexCoord2f(uv[1].Xf(), uv[1].Yf());
          glVertex2f(dx + destWidth, dy - destHeight);
  
          glTexCoord2f(uv[1].Xf(), uv[0].Yf());
          glVertex2f(dx + destWidth, dy);
      glEnd();
  
      return advance;
  }
  
  

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