| /* |
| * 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 |