The Tor Browser: gfx/skia/trunk/src/effects/gradients/SkClampRange.h@ca08bd8f51b2

     2 /*

     3  * Copyright 2011 Google Inc.

     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 SkClampRange_DEFINED

    11 #define SkClampRange_DEFINED

    13 #include "SkFixed.h"

    15 /**

    16  *  Iteration fixed fx by dx, clamping as you go to [0..0xFFFF], this class

    17  *  computes the (up to) 3 spans there are:

    18  *

    19  *  range0: use constant value V0

    20  *  range1: iterate as usual fx += dx

    21  *  range2: use constant value V1

    22  */

    23 struct SkClampRange {

    24     int fCount0;    // count for fV0

    25     int fCount1;    // count for interpolating (fV0...fV1)

    26     int fCount2;    // count for fV1

    27     SkFixed fFx1;   // initial fx value for the fCount1 range.

    28                     // only valid if fCount1 > 0

    29     int fV0, fV1;

    30     bool fOverflowed;   // true if we had to clamp due to numerical overflow

    32     void init(SkFixed fx, SkFixed dx, int count, int v0, int v1);

    34 private:

    35     void initFor1(SkFixed fx);

    36 };

    38 #endif

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