/*
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* Copyright 2006 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkAntiRun.h"
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#include "SkTo.h"
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#include "SkUtils.h"
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void SkAlphaRuns::reset(int width) {
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SkASSERT(width > 0);
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#ifdef SK_DEBUG
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sk_memset16((uint16_t*)fRuns, (uint16_t)(-42), width);
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#endif
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fRuns[0] = SkToS16(width);
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fRuns[width] = 0;
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fAlpha[0] = 0;
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SkDEBUGCODE(fWidth = width;)
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SkDEBUGCODE(this->validate();)
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}
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#ifdef SK_DEBUG
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void SkAlphaRuns::assertValid(int y, int maxStep) const {
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int max = (y + 1) * maxStep - (y == maxStep - 1);
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const int16_t* runs = fRuns;
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const uint8_t* alpha = fAlpha;
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while (*runs) {
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SkASSERT(*alpha <= max);
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alpha += *runs;
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runs += *runs;
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}
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}
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void SkAlphaRuns::dump() const {
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const int16_t* runs = fRuns;
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const uint8_t* alpha = fAlpha;
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SkDebugf("Runs");
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while (*runs) {
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int n = *runs;
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SkDebugf(" %02x", *alpha);
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if (n > 1) {
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SkDebugf(",%d", n);
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}
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alpha += n;
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runs += n;
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}
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SkDebugf("\n");
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}
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void SkAlphaRuns::validate() const {
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SkASSERT(fWidth > 0);
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int count = 0;
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const int16_t* runs = fRuns;
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while (*runs) {
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SkASSERT(*runs > 0);
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count += *runs;
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SkASSERT(count <= fWidth);
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runs += *runs;
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}
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SkASSERT(count == fWidth);
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}
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#endif
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