| /* libs/graphics/sgl/SkAutoKern.h |
| ** |
| ** Copyright 2006, The Android Open Source Project |
| ** |
| ** Licensed under the Apache License, Version 2.0 (the "License"); |
| ** you may not use this file except in compliance with the License. |
| ** You may obtain a copy of the License at |
| ** |
| ** http://www.apache.org/licenses/LICENSE-2.0 |
| ** |
| ** Unless required by applicable law or agreed to in writing, software |
| ** distributed under the License is distributed on an "AS IS" BASIS, |
| ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| ** See the License for the specific language governing permissions and |
| ** limitations under the License. |
| */ |
| |
| #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 |
| |