1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/core/SkAlphaRuns.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,73 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2006 The Android Open Source Project
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +
1.13 +#include "SkAntiRun.h"
1.14 +#include "SkUtils.h"
1.15 +
1.16 +void SkAlphaRuns::reset(int width) {
1.17 + SkASSERT(width > 0);
1.18 +
1.19 +#ifdef SK_DEBUG
1.20 + sk_memset16((uint16_t*)fRuns, (uint16_t)(-42), width);
1.21 +#endif
1.22 + fRuns[0] = SkToS16(width);
1.23 + fRuns[width] = 0;
1.24 + fAlpha[0] = 0;
1.25 +
1.26 + SkDEBUGCODE(fWidth = width;)
1.27 + SkDEBUGCODE(this->validate();)
1.28 +}
1.29 +
1.30 +#ifdef SK_DEBUG
1.31 + void SkAlphaRuns::assertValid(int y, int maxStep) const {
1.32 + int max = (y + 1) * maxStep - (y == maxStep - 1);
1.33 +
1.34 + const int16_t* runs = fRuns;
1.35 + const uint8_t* alpha = fAlpha;
1.36 +
1.37 + while (*runs) {
1.38 + SkASSERT(*alpha <= max);
1.39 + alpha += *runs;
1.40 + runs += *runs;
1.41 + }
1.42 + }
1.43 +
1.44 + void SkAlphaRuns::dump() const {
1.45 + const int16_t* runs = fRuns;
1.46 + const uint8_t* alpha = fAlpha;
1.47 +
1.48 + SkDebugf("Runs");
1.49 + while (*runs) {
1.50 + int n = *runs;
1.51 +
1.52 + SkDebugf(" %02x", *alpha);
1.53 + if (n > 1) {
1.54 + SkDebugf(",%d", n);
1.55 + }
1.56 + alpha += n;
1.57 + runs += n;
1.58 + }
1.59 + SkDebugf("\n");
1.60 + }
1.61 +
1.62 + void SkAlphaRuns::validate() const {
1.63 + SkASSERT(fWidth > 0);
1.64 +
1.65 + int count = 0;
1.66 + const int16_t* runs = fRuns;
1.67 +
1.68 + while (*runs) {
1.69 + SkASSERT(*runs > 0);
1.70 + count += *runs;
1.71 + SkASSERT(count <= fWidth);
1.72 + runs += *runs;
1.73 + }
1.74 + SkASSERT(count == fWidth);
1.75 + }
1.76 +#endif
