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<!DOCTYPE bugzilla SYSTEM "https://bugs.webkit.org/page.cgi?id=bugzilla.dtd">

<bugzilla version="5.0.4.1"
          urlbase="https://bugs.webkit.org/"
          
          maintainer="admin@webkit.org"
>

    <bug>
          <bug_id>250384</bug_id>
          
          <creation_ts>2023-01-10 07:07:11 -0800</creation_ts>
          <short_desc>Potential Assertion Fix - newStartAngle &gt;= 0 &amp;&amp; newStartAngle &lt; twoPiFloat</short_desc>
          <delta_ts>2023-10-30 02:45:05 -0700</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>1</classification_id>
          <classification>Unclassified</classification>
          <product>WebKit</product>
          <component>Canvas</component>
          <version>Safari Technology Preview</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>RESOLVED</bug_status>
          <resolution>FIXED</resolution>
          
          
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords>InRadar</keywords>
          <priority>P2</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Ahmad Saleem">ahmad.saleem792</reporter>
          <assigned_to name="Nobody">webkit-unassigned</assigned_to>
          <cc>dino</cc>
    
    <cc>webkit-bug-importer</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>1924403</commentid>
    <comment_count>0</comment_count>
    <who name="Ahmad Saleem">ahmad.saleem792</who>
    <bug_when>2023-01-10 07:07:11 -0800</bug_when>
    <thetext>Hi Team,

While going through Blink&apos;s commit, I came across following potential assertion fix:

Blink Commit - https://chromium.googlesource.com/chromium/blink/+/651895c0233495405847471d42dab20deab2a0f3

WebKit Source - https://github.com/WebKit/WebKit/blob/28de25b653f64ca3fc8e87fbf1d1a963329a5342/Source/WebCore/html/canvas/CanvasPath.cpp#L143

Unfortunately, it does not have any test case to confirm whether it is an issue in Safari / WebKit or not but just wanted to get an input.

Thanks!</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1925984</commentid>
    <comment_count>1</comment_count>
    <who name="Radar WebKit Bug Importer">webkit-bug-importer</who>
    <bug_when>2023-01-17 07:08:16 -0800</bug_when>
    <thetext>&lt;rdar://problem/104332195&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1988105</commentid>
    <comment_count>2</comment_count>
    <who name="Ahmad Saleem">ahmad.saleem792</who>
    <bug_when>2023-10-27 15:00:01 -0700</bug_when>
    <thetext>This compiles:

tatic void normalizeAngles(float&amp; startAngle, float&amp; endAngle, bool anticlockwise)
{
    float newStartAngle = fmodf(startAngle, (2 * piFloat));
    if (newStartAngle &lt; 0)
        newStartAngle += (2 * piFloat);</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1988107</commentid>
    <comment_count>3</comment_count>
    <who name="Ahmad Saleem">ahmad.saleem792</who>
    <bug_when>2023-10-27 15:03:33 -0700</bug_when>
    <thetext>If we add this:

    constexpr auto twoPiFloat = 2 * piFloat;

we can simplify whole function:

static void normalizeAngles(float&amp; startAngle, float&amp; endAngle, bool anticlockwise)
{
    constexpr auto twoPiFloat = 2 * piFloat;
    float newStartAngle = fmodf(startAngle, twoPiFloat);
    if (newStartAngle &lt; 0)
        newStartAngle += twoPiFloat;
    float delta = newStartAngle - startAngle;
    startAngle = newStartAngle;
    endAngle = endAngle + delta;
    ASSERT(newStartAngle &gt;= 0 &amp;&amp; (newStartAngle &lt; twoPiFloat || WTF::areEssentiallyEqual&lt;float&gt;(newStartAngle, twoPiFloat)));
    if (anticlockwise &amp;&amp; startAngle - endAngle &gt;= twoPiFloat)
        endAngle = startAngle - twoPiFloat;
    else if (!anticlockwise &amp;&amp; endAngle - startAngle &gt;= twoPiFloat)
        endAngle = startAngle + twoPiFloat;
}</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1988313</commentid>
    <comment_count>4</comment_count>
    <who name="Ahmad Saleem">ahmad.saleem792</who>
    <bug_when>2023-10-29 06:33:57 -0700</bug_when>
    <thetext>PR attempt - https://github.com/WebKit/WebKit/pull/19657</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1988424</commentid>
    <comment_count>5</comment_count>
    <who name="EWS">ews-feeder</who>
    <bug_when>2023-10-30 02:45:03 -0700</bug_when>
    <thetext>Committed 269925@main (34e0f2e73041): &lt;https://commits.webkit.org/269925@main&gt;

Reviewed commits have been landed. Closing PR #19657 and removing active labels.</thetext>
  </long_desc>
      
      

    </bug>

</bugzilla>