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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkAutoKern_DEFINED
#define SkAutoKern_DEFINED
#include "SkGlyph.h"
#define SkAutoKern_Adjust(prev, next) SkIntToScalar(((next) - (prev) + 32) >> 6)
/* this is a helper class to perform auto-kerning
* the adjust() method returns a SkScalar corresponding
* to a +1/0/-1 pixel adjustment
*/
class SkAutoKern {
public:
SkAutoKern() : fPrevRsbDelta(0) {}
SkScalar adjust(const SkGlyph& glyph)
{
// if (SkAbs32(glyph.fLsbDelta) > 47 || SkAbs32(glyph.fRsbDelta) > 47)
// printf("------- %d> L %d R %d\n", glyph.f_GlyphID, glyph.fLsbDelta, glyph.fRsbDelta);
#if 0
int distort = fPrevRsbDelta - glyph.fLsbDelta;
fPrevRsbDelta = glyph.fRsbDelta;
if (distort >= 32)
return -SK_Scalar1;
else if (distort < -32)
return +SK_Scalar1;
else
return 0;
#else
SkScalar adjust = SkAutoKern_Adjust(fPrevRsbDelta, glyph.fLsbDelta);
fPrevRsbDelta = glyph.fRsbDelta;
return adjust;
#endif
}
private:
int fPrevRsbDelta;
};
#endif
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