blob: 37f57c1fa8b5c68bdfd6f6aea15bae0ca875a21d [file] [log] [blame]
/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkAntiRun.h"
#include "SkUtils.h"
void SkAlphaRuns::reset(int width) {
SkASSERT(width > 0);
#ifdef SK_DEBUG
sk_memset16((uint16_t*)fRuns, (uint16_t)(-42), width);
#endif
fRuns[0] = SkToS16(width);
fRuns[width] = 0;
fAlpha[0] = 0;
SkDEBUGCODE(fWidth = width;)
SkDEBUGCODE(this->validate();)
}
#ifdef SK_DEBUG
void SkAlphaRuns::assertValid(int y, int maxStep) const {
int max = (y + 1) * maxStep - (y == maxStep - 1);
const int16_t* runs = fRuns;
const uint8_t* alpha = fAlpha;
while (*runs) {
SkASSERT(*alpha <= max);
alpha += *runs;
runs += *runs;
}
}
void SkAlphaRuns::dump() const {
const int16_t* runs = fRuns;
const uint8_t* alpha = fAlpha;
SkDebugf("Runs");
while (*runs) {
int n = *runs;
SkDebugf(" %02x", *alpha);
if (n > 1) {
SkDebugf(",%d", n);
}
alpha += n;
runs += n;
}
SkDebugf("\n");
}
void SkAlphaRuns::validate() const {
SkASSERT(fWidth > 0);
int count = 0;
const int16_t* runs = fRuns;
while (*runs) {
SkASSERT(*runs > 0);
count += *runs;
SkASSERT(count <= fWidth);
runs += *runs;
}
SkASSERT(count == fWidth);
}
#endif