зеркало из https://github.com/mozilla/pjs.git
55 строки
1.3 KiB
C++
55 строки
1.3 KiB
C++
|
|
/*
|
|
* 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 "SkScalerContext.h"
|
|
|
|
#define SkAutoKern_AdjustF(prev, next) (((next) - (prev) + 32) >> 6 << 16)
|
|
#define SkAutoKern_AdjustS(prev, next) SkIntToScalar(((next) - (prev) + 32) >> 6)
|
|
|
|
/* this is a helper class to perform auto-kerning
|
|
* the adjust() method returns a SkFixed corresponding
|
|
* to a +1/0/-1 pixel adjustment
|
|
*/
|
|
|
|
class SkAutoKern {
|
|
public:
|
|
SkAutoKern() : fPrevRsbDelta(0) {}
|
|
|
|
SkFixed 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_Fixed1;
|
|
else if (distort < -32)
|
|
return +SK_Fixed1;
|
|
else
|
|
return 0;
|
|
#else
|
|
SkFixed adjust = SkAutoKern_AdjustF(fPrevRsbDelta, glyph.fLsbDelta);
|
|
fPrevRsbDelta = glyph.fRsbDelta;
|
|
return adjust;
|
|
#endif
|
|
}
|
|
private:
|
|
int fPrevRsbDelta;
|
|
};
|
|
|
|
#endif
|
|
|