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Diffstat (limited to 'src/core/SkAutoKern.h')
-rw-r--r-- | src/core/SkAutoKern.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/src/core/SkAutoKern.h b/src/core/SkAutoKern.h new file mode 100644 index 0000000000..8b032519b3 --- /dev/null +++ b/src/core/SkAutoKern.h @@ -0,0 +1,51 @@ +/* + * 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 |