mirror of https://github.com/axmolengine/axmol.git
47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
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/*
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Copyright 2011 Google Inc.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 SkClampRange_DEFINED
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#define SkClampRange_DEFINED
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#include "SkFixed.h"
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/**
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* Iteration fixed fx by dx, clamping as you go to [0..0xFFFF], this class
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* computes the (up to) 3 spans there are:
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*
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* range0: use constant value V0
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* range1: iterate as usual fx += dx
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* range2: use constant value V1
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*/
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struct SkClampRange {
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int fCount0; // count for fV0
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int fCount1; // count for interpolating (fV0...fV1)
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int fCount2; // count for fV1
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SkFixed fFx1; // initial fx value for the fCount1 range.
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// only valid if fCount1 > 0
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int fV0, fV1;
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bool fOverflowed; // true if we had to clamp due to numerical overflow
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void init(SkFixed fx, SkFixed dx, int count, int v0, int v1);
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private:
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void initFor1(SkFixed fx);
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};
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#endif
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