mirror of https://github.com/axmolengine/axmol.git
72 lines
2.0 KiB
C++
72 lines
2.0 KiB
C++
/* libs/graphics/sgl/SkAntiRun.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 SkAntiRun_DEFINED
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#define SkAntiRun_DEFINED
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#include "SkBlitter.h"
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class SkAlphaRuns {
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public:
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int16_t* fRuns;
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uint8_t* fAlpha;
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bool empty() const {
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SkASSERT(fRuns[0] > 0);
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return fAlpha[0] == 0 && fRuns[fRuns[0]] == 0;
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}
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void reset(int width);
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/**
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* Returns the offsetX value that should be passed on the next call,
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* assuming we're on the same scanline. If the caller is switching
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* scanlines, then offsetX should be 0 when this is called.
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*/
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int add(int x, U8CPU startAlpha, int middleCount, U8CPU stopAlpha,
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U8CPU maxValue, int offsetX);
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SkDEBUGCODE(void assertValid(int y, int maxStep) const;)
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SkDEBUGCODE(void dump() const;)
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static void Break(int16_t runs[], uint8_t alpha[], int x, int count);
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static void BreakAt(int16_t runs[], uint8_t alpha[], int x) {
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while (x > 0) {
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int n = runs[0];
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SkASSERT(n > 0);
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if (x < n) {
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alpha[x] = alpha[0];
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runs[0] = SkToS16(x);
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runs[x] = SkToS16(n - x);
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break;
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}
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runs += n;
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alpha += n;
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x -= n;
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}
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}
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private:
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SkDEBUGCODE(int fWidth;)
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SkDEBUGCODE(void validate() const;)
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};
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#endif
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