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151 lines
3.8 KiB
C++
151 lines
3.8 KiB
C++
#ifndef __FTGLTextureFont__
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#define __FTGLTextureFont__
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#include "FTFont.h"
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#include "FTVector.h"
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#include "FTGL.h"
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class FTTextureGlyph;
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/**
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* FTGLTextureFont is a specialisation of the FTFont class for handling
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* Texture mapped fonts
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*
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* @see FTFont
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*/
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class FTGL_EXPORT FTGLTextureFont : public FTFont
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{
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public:
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/**
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* Open and read a font file. Sets Error flag.
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*
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* @param fontFilePath font file path.
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*/
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FTGLTextureFont( const char* fontFilePath);
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/**
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* Open and read a font from a buffer in memory. Sets Error flag.
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*
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* @param pBufferBytes the in-memory buffer
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* @param bufferSizeInBytes the length of the buffer in bytes
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*/
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FTGLTextureFont( const unsigned char *pBufferBytes, size_t bufferSizeInBytes);
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/**
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* Destructor
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*/
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virtual ~FTGLTextureFont();
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/**
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* Set the char size for the current face.
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*
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* @param size the face size in points (1/72 inch)
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* @param res the resolution of the target device.
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* @return <code>true</code> if size was set correctly
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*/
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virtual bool FaceSize( const unsigned int size, const unsigned int res = 72);
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/**
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* Renders a string of characters
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*
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* @param string 'C' style string to be output.
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*/
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virtual void Render( const char* string);
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/**
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* Renders a string of characters
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*
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* @param string wchar_t string to be output.
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*/
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virtual void Render( const wchar_t* string);
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private:
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/**
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* Construct a FTTextureGlyph.
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*
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* @param glyphIndex The glyph index NOT the char code.
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* @return An FTTextureGlyph or <code>null</code> on failure.
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*/
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inline virtual FTGlyph* MakeGlyph( unsigned int glyphIndex);
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/**
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* Get the size of a block of memory required to layout the glyphs
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*
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* Calculates a width and height based on the glyph sizes and the
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* number of glyphs. It over estimates.
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*/
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inline void CalculateTextureSize();
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/**
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* Creates a 'blank' OpenGL texture object.
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*
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* The format is GL_ALPHA and the params are
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* GL_TEXTURE_WRAP_S = GL_CLAMP
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* GL_TEXTURE_WRAP_T = GL_CLAMP
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* GL_TEXTURE_MAG_FILTER = GL_LINEAR
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* GL_TEXTURE_MIN_FILTER = GL_LINEAR
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* Note that mipmapping is NOT used
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*/
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inline GLuint CreateTexture();
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/**
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* The maximum texture dimension on this OpenGL implemetation
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*/
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GLsizei maximumGLTextureSize;
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/**
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* The minimum texture width required to hold the glyphs
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*/
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GLsizei textureWidth;
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/**
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* The minimum texture height required to hold the glyphs
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*/
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GLsizei textureHeight;
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/**
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*An array of texture ids
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*/
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FTVector<GLuint> textureIDList;
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/**
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* The max height for glyphs in the current font
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*/
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int glyphHeight;
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/**
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* The max width for glyphs in the current font
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*/
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int glyphWidth;
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/**
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* A value to be added to the height and width to ensure that
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* glyphs don't overlap in the texture
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*/
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unsigned int padding;
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/**
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*
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*/
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unsigned int numGlyphs;
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/**
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*/
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unsigned int remGlyphs;
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/**
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*/
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int xOffset;
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/**
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*/
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int yOffset;
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};
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#endif // __FTGLTextureFont__
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