The Tor Browser: gfx/skia/trunk/include/core/SkLineClipper.h@b8a032363ba2

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

     2 /*

     3  * Copyright 2011 Google Inc.

     4  *

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

     6  * found in the LICENSE file.

     7  */

     8 #ifndef SkLineClipper_DEFINED

     9 #define SkLineClipper_DEFINED

    11 #include "SkRect.h"

    12 #include "SkPoint.h"

    14 class SkLineClipper {

    15 public:

    16     enum {

    17         kMaxPoints = 4,

    18         kMaxClippedLineSegments = kMaxPoints - 1

    19     };

    21     /*  Clip the line pts[0]...pts[1] against clip, ignoring segments that

    22         lie completely above or below the clip. For portions to the left or

    23         right, turn those into vertical line segments that are aligned to the

    24         edge of the clip.

    26         Return the number of line segments that result, and store the end-points

    27         of those segments sequentially in lines as follows:

    28             1st segment: lines[0]..lines[1]

    29             2nd segment: lines[1]..lines[2]

    30             3rd segment: lines[2]..lines[3]

    31      */

    32     static int ClipLine(const SkPoint pts[2], const SkRect& clip,

    33                         SkPoint lines[kMaxPoints]);

    35     /*  Intersect the line segment against the rect. If there is a non-empty

    36         resulting segment, return true and set dst[] to that segment. If not,

    37         return false and ignore dst[].

    39         ClipLine is specialized for scan-conversion, as it adds vertical

    40         segments on the sides to show where the line extended beyond the

    41         left or right sides. IntersectLine does not.

    42      */

    43     static bool IntersectLine(const SkPoint src[2], const SkRect& clip,

    44                               SkPoint dst[2]);

    45 };

    47 #endif

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