The Tor Browser: gfx/skia/trunk/src/core/SkAutoKern.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     2 /*

     3  * Copyright 2006 The Android Open Source Project

     4  *

     5  * Use of this source code is governed by a BSD-style license that can be

     6  * found in the LICENSE file.

     7  */

    10 #ifndef SkAutoKern_DEFINED

    11 #define SkAutoKern_DEFINED

    13 #include "SkGlyph.h"

    15 #define SkAutoKern_AdjustF(prev, next)    (((next) - (prev) + 32) >> 6 << 16)

    16 #define SkAutoKern_AdjustS(prev, next)    SkIntToScalar(((next) - (prev) + 32) >> 6)

    18 /* this is a helper class to perform auto-kerning

    19  * the adjust() method returns a SkFixed corresponding

    20  * to a +1/0/-1 pixel adjustment

    21  */

    23 class SkAutoKern {

    24 public:

    25     SkAutoKern() : fPrevRsbDelta(0) {}

    27     SkFixed  adjust(const SkGlyph&  glyph)

    28     {

    29 //        if (SkAbs32(glyph.fLsbDelta) > 47 || SkAbs32(glyph.fRsbDelta) > 47)

    30 //            printf("------- %d> L %d R %d\n", glyph.f_GlyphID, glyph.fLsbDelta, glyph.fRsbDelta);

    32 #if 0

    33         int  distort = fPrevRsbDelta - glyph.fLsbDelta;

    35         fPrevRsbDelta = glyph.fRsbDelta;

    37         if (distort >= 32)

    38             return -SK_Fixed1;

    39         else if (distort < -32)

    40             return +SK_Fixed1;

    41         else

    42             return 0;

    43 #else

    44         SkFixed adjust = SkAutoKern_AdjustF(fPrevRsbDelta, glyph.fLsbDelta);

    45         fPrevRsbDelta = glyph.fRsbDelta;

    46         return adjust;

    47 #endif

    48     }

    49 private:

    50     int   fPrevRsbDelta;

    51 };

    53 #endif

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