[Webkit-unassigned] [Bug 138951] New: [GTK][EFL] Fix the broken edge-distance antialiasing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=138951

            Bug ID: 138951
           Summary: [GTK][EFL] Fix the broken edge-distance antialiasing
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Platform
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jb.seo at lge.com

There exist a wrong matrix multiply to get viewport space position.
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vec4 toViewportSpace(vec2 pos) { return vec4(pos, 0., 1.) * u_modelViewMatrix; }
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It generates wrong position and affects the inflation ratio to each vertices.
The transformation matrix should be left side.

After fix the multiplication, I got little strange result.
Anti-aliased layer's (inner) contents are expanded 1px.
But it shouldn't happen and only edge should be inflated.

Than I just erase the clamp function to create transformedTexCoord, and finally, got the good result.
But in theory clamping the position should be there, because we using GL_REPEAT in many case.

Please give me some idea or comment.

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