The Tor Browser: gfx/skia/trunk/src/core/SkAlphaRuns.cpp@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     2 /*

     3  * Copyright 2006 The Android Open Source Project

     4  *

     5  * Use of this source code is governed by a BSD-style license that can be

     6  * found in the LICENSE file.

     7  */

    10 #include "SkAntiRun.h"

    11 #include "SkUtils.h"

    13 void SkAlphaRuns::reset(int width) {

    14     SkASSERT(width > 0);

    16 #ifdef SK_DEBUG

    17     sk_memset16((uint16_t*)fRuns, (uint16_t)(-42), width);

    18 #endif

    19     fRuns[0] = SkToS16(width);

    20     fRuns[width] = 0;

    21     fAlpha[0] = 0;

    23     SkDEBUGCODE(fWidth = width;)

    24     SkDEBUGCODE(this->validate();)

    25 }

    27 #ifdef SK_DEBUG

    28     void SkAlphaRuns::assertValid(int y, int maxStep) const {

    29         int max = (y + 1) * maxStep - (y == maxStep - 1);

    31         const int16_t* runs = fRuns;

    32         const uint8_t*   alpha = fAlpha;

    34         while (*runs) {

    35             SkASSERT(*alpha <= max);

    36             alpha += *runs;

    37             runs += *runs;

    38         }

    39     }

    41     void SkAlphaRuns::dump() const {

    42         const int16_t* runs = fRuns;

    43         const uint8_t* alpha = fAlpha;

    45         SkDebugf("Runs");

    46         while (*runs) {

    47             int n = *runs;

    49             SkDebugf(" %02x", *alpha);

    50             if (n > 1) {

    51                 SkDebugf(",%d", n);

    52             }

    53             alpha += n;

    54             runs += n;

    55         }

    56         SkDebugf("\n");

    57     }

    59     void SkAlphaRuns::validate() const {

    60         SkASSERT(fWidth > 0);

    62         int         count = 0;

    63         const int16_t*  runs = fRuns;

    65         while (*runs) {

    66             SkASSERT(*runs > 0);

    67             count += *runs;

    68             SkASSERT(count <= fWidth);

    69             runs += *runs;

    70         }

    71         SkASSERT(count == fWidth);

    72     }

    73 #endif

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