1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/core/SkAutoKern.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,53 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2006 The Android Open Source Project
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +
1.13 +#ifndef SkAutoKern_DEFINED
1.14 +#define SkAutoKern_DEFINED
1.15 +
1.16 +#include "SkGlyph.h"
1.17 +
1.18 +#define SkAutoKern_AdjustF(prev, next) (((next) - (prev) + 32) >> 6 << 16)
1.19 +#define SkAutoKern_AdjustS(prev, next) SkIntToScalar(((next) - (prev) + 32) >> 6)
1.20 +
1.21 +/* this is a helper class to perform auto-kerning
1.22 + * the adjust() method returns a SkFixed corresponding
1.23 + * to a +1/0/-1 pixel adjustment
1.24 + */
1.25 +
1.26 +class SkAutoKern {
1.27 +public:
1.28 + SkAutoKern() : fPrevRsbDelta(0) {}
1.29 +
1.30 + SkFixed adjust(const SkGlyph& glyph)
1.31 + {
1.32 +// if (SkAbs32(glyph.fLsbDelta) > 47 || SkAbs32(glyph.fRsbDelta) > 47)
1.33 +// printf("------- %d> L %d R %d\n", glyph.f_GlyphID, glyph.fLsbDelta, glyph.fRsbDelta);
1.34 +
1.35 +#if 0
1.36 + int distort = fPrevRsbDelta - glyph.fLsbDelta;
1.37 +
1.38 + fPrevRsbDelta = glyph.fRsbDelta;
1.39 +
1.40 + if (distort >= 32)
1.41 + return -SK_Fixed1;
1.42 + else if (distort < -32)
1.43 + return +SK_Fixed1;
1.44 + else
1.45 + return 0;
1.46 +#else
1.47 + SkFixed adjust = SkAutoKern_AdjustF(fPrevRsbDelta, glyph.fLsbDelta);
1.48 + fPrevRsbDelta = glyph.fRsbDelta;
1.49 + return adjust;
1.50 +#endif
1.51 + }
1.52 +private:
1.53 + int fPrevRsbDelta;
1.54 +};
1.55 +
1.56 +#endif
