1/*
2 * Copyright 2006 The Android Open Source Project
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8
9#include "SkAntiRun.h"
10#include "SkUtils.h"
11
12void SkAlphaRuns::reset(int width) {
13    SkASSERT(width > 0);
14
15#ifdef SK_DEBUG
16    sk_memset16((uint16_t*)fRuns, (uint16_t)(-42), width);
17#endif
18    fRuns[0] = SkToS16(width);
19    fRuns[width] = 0;
20    fAlpha[0] = 0;
21
22    SkDEBUGCODE(fWidth = width;)
23    SkDEBUGCODE(this->validate();)
24}
25
26#ifdef SK_DEBUG
27    void SkAlphaRuns::assertValid(int y, int maxStep) const {
28        int max = (y + 1) * maxStep - (y == maxStep - 1);
29
30        const int16_t* runs = fRuns;
31        const uint8_t*   alpha = fAlpha;
32
33        while (*runs) {
34            SkASSERT(*alpha <= max);
35            alpha += *runs;
36            runs += *runs;
37        }
38    }
39
40    void SkAlphaRuns::dump() const {
41        const int16_t* runs = fRuns;
42        const uint8_t* alpha = fAlpha;
43
44        SkDebugf("Runs");
45        while (*runs) {
46            int n = *runs;
47
48            SkDebugf(" %02x", *alpha);
49            if (n > 1) {
50                SkDebugf(",%d", n);
51            }
52            alpha += n;
53            runs += n;
54        }
55        SkDebugf("\n");
56    }
57
58    void SkAlphaRuns::validate() const {
59        SkASSERT(fWidth > 0);
60
61        int         count = 0;
62        const int16_t*  runs = fRuns;
63
64        while (*runs) {
65            SkASSERT(*runs > 0);
66            count += *runs;
67            SkASSERT(count <= fWidth);
68            runs += *runs;
69        }
70        SkASSERT(count == fWidth);
71    }
72#endif
73