63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
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/* libs/graphics/sgl/SkAutoKern.h
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**
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** Copyright 2006, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#ifndef SkAutoKern_DEFINED
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#define SkAutoKern_DEFINED
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#include "SkScalerContext.h"
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#define SkAutoKern_AdjustF(prev, next) (((next) - (prev) + 32) >> 6 << 16)
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#define SkAutoKern_AdjustS(prev, next) SkIntToScalar(((next) - (prev) + 32) >> 6)
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/* this is a helper class to perform auto-kerning
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* the adjust() method returns a SkFixed corresponding
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* to a +1/0/-1 pixel adjustment
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*/
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class SkAutoKern {
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public:
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SkAutoKern() : fPrevRsbDelta(0) {}
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SkFixed adjust(const SkGlyph& glyph)
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{
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// if (SkAbs32(glyph.fLsbDelta) > 47 || SkAbs32(glyph.fRsbDelta) > 47)
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// printf("------- %d> L %d R %d\n", glyph.f_GlyphID, glyph.fLsbDelta, glyph.fRsbDelta);
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#if 0
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int distort = fPrevRsbDelta - glyph.fLsbDelta;
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fPrevRsbDelta = glyph.fRsbDelta;
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if (distort >= 32)
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return -SK_Fixed1;
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else if (distort < -32)
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return +SK_Fixed1;
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else
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return 0;
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#else
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SkFixed adjust = SkAutoKern_AdjustF(fPrevRsbDelta, glyph.fLsbDelta);
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fPrevRsbDelta = glyph.fRsbDelta;
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return adjust;
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#endif
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}
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private:
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int fPrevRsbDelta;
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};
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#endif
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