kc3-lang/ftgl/src/FTFont/FTTextureFontImpl.h

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  Date : 2009-07-19T13:05:50
  

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• src/FTFont/FTTextureFontImpl.h

• /*
   * 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.
   */
  
  #ifndef __FTTextureFontImpl__
  #define __FTTextureFontImpl__
  
  #include "FTFontImpl.h"
  
  #include "FTVector.h"
  
  class FTTextureGlyph;
  
  class FTTextureFontImpl : public FTFontImpl
  {
      friend class FTTextureFont;
  
      protected:
          FTTextureFontImpl(FTFont *ftFont, const char* fontFilePath);
  
          FTTextureFontImpl(FTFont *ftFont, const unsigned char *pBufferBytes,
                            size_t bufferSizeInBytes);
  
          virtual ~FTTextureFontImpl();
  
          /**
           * Set the char size for the current face.
           *
           * @param size      the face size in points (1/72 inch)
           * @param res       the resolution of the target device.
           * @return          <code>true</code> if size was set correctly
           */
          virtual bool FaceSize(const unsigned int size,
                                const unsigned int res = 72);
  
          virtual FTPoint Render(const char *s, const int len,
                                 FTPoint position, FTPoint spacing,
                                 int renderMode);
  
          virtual FTPoint Render(const wchar_t *s, const int len,
                                 FTPoint position, FTPoint spacing,
                                 int renderMode);
  
      private:
          /**
           * Create an FTTextureGlyph object for the base class.
           */
          FTGlyph* MakeGlyphImpl(FT_GlyphSlot ftGlyph);
  
          /**
           * Get the size of a block of memory required to layout the glyphs
           *
           * Calculates a width and height based on the glyph sizes and the
           * number of glyphs. It over estimates.
           */
          inline void CalculateTextureSize();
  
          /**
           * Creates a 'blank' OpenGL texture object.
           *
           * The format is GL_ALPHA and the params are
           * GL_TEXTURE_WRAP_S = GL_CLAMP
           * GL_TEXTURE_WRAP_T = GL_CLAMP
           * GL_TEXTURE_MAG_FILTER = GL_LINEAR
           * GL_TEXTURE_MIN_FILTER = GL_LINEAR
           * Note that mipmapping is NOT used
           */
          inline GLuint CreateTexture();
  
          /**
           * The maximum texture dimension on this OpenGL implemetation
           */
          GLsizei maximumGLTextureSize;
  
          /**
           * The minimum texture width required to hold the glyphs
           */
          GLsizei textureWidth;
  
          /**
           * The minimum texture height required to hold the glyphs
           */
          GLsizei textureHeight;
  
          /**
           *An array of texture ids
           */
          FTVector<GLuint> textureIDList;
  
          /**
           * The max height for glyphs in the current font
           */
          int glyphHeight;
  
          /**
           * The max width for glyphs in the current font
           */
          int glyphWidth;
  
          /**
           * A value to be added to the height and width to ensure that
           * glyphs don't overlap in the texture
           */
          unsigned int padding;
  
          /**
           *
           */
          unsigned int numGlyphs;
  
          /**
           */
          unsigned int remGlyphs;
  
          /**
           */
          int xOffset;
  
          /**
           */
          int yOffset;
  
          /* Internal generic Render() implementation */
          template <typename T>
          inline FTPoint RenderI(const T *s, const int len,
                                 FTPoint position, FTPoint spacing, int mode);
  };
  
  #endif // __FTTextureFontImpl__
  
  

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