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//========================================================================
//
// SplashFont.h
//
//========================================================================
//========================================================================
//
// Modified under the Poppler project - http://poppler.freedesktop.org
//
// All changes made under the Poppler project to this file are licensed
// under GPL version 2 or later
//
// Copyright (C) 2007-2008, 2018, 2019 Albert Astals Cid <aacid@kde.org>
// Copyright (C) 2018 Oliver Sander <oliver.sander@tu-dresden.de>
//
// To see a description of the changes please see the Changelog file that
// came with your tarball or type make ChangeLog if you are building from git
//
//========================================================================
#ifndef SPLASHFONT_H
#define SPLASHFONT_H
#include "SplashTypes.h"
#include "SplashClip.h"
struct SplashGlyphBitmap;
struct SplashFontCacheTag;
class SplashFontFile;
class SplashPath;
//------------------------------------------------------------------------
// Fractional positioning uses this many bits to the right of the
// decimal points.
#define splashFontFractionBits 2
#define splashFontFraction (1 << splashFontFractionBits)
#define splashFontFractionMul \
((SplashCoord)1 / (SplashCoord)splashFontFraction)
//------------------------------------------------------------------------
// SplashFont
//------------------------------------------------------------------------
class SplashFont {
public:
SplashFont(SplashFontFile *fontFileA, const SplashCoord *matA,
const SplashCoord *textMatA, bool aaA);
// This must be called after the constructor, so that the subclass
// constructor has a chance to compute the bbox.
void initCache();
virtual ~SplashFont();
SplashFont(const SplashFont &) = delete;
SplashFont& operator=(const SplashFont &) = delete;
SplashFontFile *getFontFile() { return fontFile; }
// Return true if <this> matches the specified font file and matrix.
bool matches(SplashFontFile *fontFileA, const SplashCoord *matA,
const SplashCoord *textMatA) const {
return fontFileA == fontFile &&
matA[0] == mat[0] && matA[1] == mat[1] &&
matA[2] == mat[2] && matA[3] == mat[3] &&
textMatA[0] == textMat[0] && textMatA[1] == textMat[1] &&
textMatA[2] == textMat[2] && textMatA[3] == textMat[3];
}
// Get a glyph - this does a cache lookup first, and if not found,
// creates a new bitmap and adds it to the cache. The <xFrac> and
// <yFrac> values are splashFontFractionBits bits each, representing
// the numerators of fractions in [0, 1), where the denominator is
// splashFontFraction = 1 << splashFontFractionBits. Subclasses
// should override this to zero out xFrac and/or yFrac if they don't
// support fractional coordinates.
virtual bool getGlyph(int c, int xFrac, int yFrac,
SplashGlyphBitmap *bitmap, int x0, int y0, SplashClip *clip, SplashClipResult *clipRes);
// Rasterize a glyph. The <xFrac> and <yFrac> values are the same
// as described for getGlyph.
virtual bool makeGlyph(int c, int xFrac, int yFrac,
SplashGlyphBitmap *bitmap, int x0, int y0, SplashClip *clip, SplashClipResult *clipRes) = 0;
// Return the path for a glyph.
virtual SplashPath *getGlyphPath(int c) = 0;
// Return the advance of a glyph. (in 0..1 range)
// < 0 means not known
virtual double getGlyphAdvance(int c) { return -1; }
// Return the font transform matrix.
SplashCoord *getMatrix() { return mat; }
// Return the glyph bounding box.
void getBBox(int *xMinA, int *yMinA, int *xMaxA, int *yMaxA)
{ *xMinA = xMin; *yMinA = yMin; *xMaxA = xMax; *yMaxA = yMax; }
protected:
SplashFontFile *fontFile;
SplashCoord mat[4]; // font transform matrix
// (text space -> device space)
SplashCoord textMat[4]; // text transform matrix
// (text space -> user space)
bool aa; // anti-aliasing
int xMin, yMin, xMax, yMax; // glyph bounding box
unsigned char *cache; // glyph bitmap cache
SplashFontCacheTag * // cache tags
cacheTags;
int glyphW, glyphH; // size of glyph bitmaps
int glyphSize; // size of glyph bitmaps, in bytes
int cacheSets; // number of sets in cache
int cacheAssoc; // cache associativity (glyphs per set)
};
#endif
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