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-//========================================================================
-//
-// SFont.h
-//
-// Base class for font rasterizers.
-//
-// Copyright 2001-2003 Glyph & Cog, LLC
-//
-//========================================================================
-
-#ifndef SFONT_H
-#define SFONT_H
-
-#include <aconf.h>
-
-#ifdef USE_GCC_PRAGMAS
-#pragma interface
-#endif
-
-#include <X11/Xlib.h>
-#include <X11/Xutil.h>
-#include "gtypes.h"
-#include "CharTypes.h"
-
-class GfxState;
-
-//------------------------------------------------------------------------
-
-class SFontEngine {
-public:
-
- SFontEngine(Display *displayA, Visual *visualA, int depthA,
- Colormap colormapA);
- 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 rMaxA, int rShiftA, int gMaxA, int gShiftA,
- int bMaxA, int bShiftA);
-
- // 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 *colorsA, int nRGBA);
-
-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>/<u> 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,
- CharCode c, Unicode u) = 0;
-
- // Add the outline of the specified character to the current path by
- // calling state->moveTo, lineTo, and curveTo. Returns true if
- // successful. If this SFont subclass doesn't implement character
- // paths, returns false immediately without modifying the current
- // path.
- virtual GBool getCharPath(CharCode c, Unicode u, GfxState *state);
-
-protected:
-};
-
-#endif