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//========================================================================
//
// SFont.h
//
// Base class for font rasterizers.
//
//========================================================================
#ifndef SFONT_H
#define SFONT_H
#ifdef __GNUC__
#pragma interface
#endif
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include "gtypes.h"
//------------------------------------------------------------------------
class SFontEngine {
public:
SFontEngine(Display *display, Visual *visual, int depth,
Colormap colormap);
virtual ~SFontEngine();
// Use a TrueColor visual. Pixel values are computed as:
//
// (r << rShift) + (g << gShift) + (b << bShift)
//
// where r, g, and b are scaled to the ranges [0,rMax], [0,gMax],
// and [0,bMax], respectively.
virtual void useTrueColor(int rMax, int rShift, int gMax, int gShift,
int bMax, int bShift);
// Use an RGB color cube. <colors> is an array containing
// <nRGB>*<nRGB>*<nRGB> pixel values in red,green,blue order, e.g.,
// for <nRGB>=2, there will be 8 entries:
//
// |--- colors[i] ---|
// i red green blue
// - ----- ----- -----
// 0 0000 0000 0000
// 1 0000 0000 ffff
// 2 0000 ffff 0000
// 3 0000 ffff ffff
// 4 ffff 0000 0000
// 5 ffff 0000 ffff
// 6 ffff ffff 0000
// 7 ffff ffff ffff
//
// The <colors> array is not copied and must remain valid for the
// lifetime of this SFont object.
virtual void useColorCube(Gulong *colors, int nRGB);
protected:
// Find the closest match to (<r>,<g>,<b>).
Gulong findColor(int r, int g, int b);
//----- X parameters
Display *display;
Visual *visual;
int depth;
Colormap colormap;
GBool trueColor; // true for TrueColor, false for RGB cube
//----- TrueColor parameters
int rMax, gMax, bMax;
int rShift, gShift, bShift;
//----- RGB color cube parameters
Gulong *colors;
int nRGB;
};
//------------------------------------------------------------------------
class SFontFile {
public:
// A typical subclass will provide a constructor along the lines of:
//
// SomeFontFile(SomeFontEngine *engine, char *fontFileName);
SFontFile();
virtual ~SFontFile();
private:
};
//------------------------------------------------------------------------
class SFont {
public:
// A typical subclass will provide a constructor along the lines of:
//
// SomeFont(SomeFontFile *fontFile, double *m);
//
// where <m> is a transform matrix consisting of four elements,
// using the PostScript ordering conventions (without any
// translation):
//
// [x' y'] = [x y] * [m0 m1]
// [m2 m3]
//
// This is the level at which fonts are cached, and so the font
// cannot be transformed after it is created.
SFont();
virtual ~SFont();
// Draw a character <c> at <x>,<y> in color (<r>,<g>,<b>). The RGB
// values should each be in the range [0,65535]. Draws into <d>,
// clipped to the rectangle (0,0)-(<w>-1,<h>-1). Returns true if
// the character was drawn successfully.
virtual GBool drawChar(Drawable d, int w, int h, GC gc,
int x, int y, int r, int g, int b, Gushort c) = 0;
protected:
};
#endif
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