gfx/skia/trunk/src/core/SkScalar.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Tue, 06 Jan 2015 21:39:09 +0100
branch
TOR_BUG_9701
changeset 8
97036ab72558
permissions
-rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     2 /*
     3  * Copyright 2010 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 "SkMath.h"
    11 #include "SkScalar.h"
    13 SkScalar SkScalarInterpFunc(SkScalar searchKey, const SkScalar keys[],
    14                             const SkScalar values[], int length) {
    15     SkASSERT(length > 0);
    16     SkASSERT(keys != NULL);
    17     SkASSERT(values != NULL);
    18 #ifdef SK_DEBUG
    19     for (int i = 1; i < length; i++)
    20         SkASSERT(keys[i] >= keys[i-1]);
    21 #endif
    22     int right = 0;
    23     while (right < length && searchKey > keys[right])
    24         right++;
    25     // Could use sentinel values to eliminate conditionals, but since the
    26     // tables are taken as input, a simpler format is better.
    27     if (length == right)
    28         return values[length-1];
    29     if (0 == right)
    30         return values[0];
    31     // Otherwise, interpolate between right - 1 and right.
    32     SkScalar rightKey = keys[right];
    33     SkScalar leftKey = keys[right-1];
    34     SkScalar fract = SkScalarDiv(searchKey-leftKey,rightKey-leftKey);
    35     return SkScalarInterp(values[right-1], values[right], fract);
    36 }

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